CN205404719U - Mutual -inductor common return multipoint earthing detector - Google Patents
Mutual -inductor common return multipoint earthing detector Download PDFInfo
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- CN205404719U CN205404719U CN201620179814.0U CN201620179814U CN205404719U CN 205404719 U CN205404719 U CN 205404719U CN 201620179814 U CN201620179814 U CN 201620179814U CN 205404719 U CN205404719 U CN 205404719U
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Abstract
The utility model discloses a mutual -inductor common return multipoint earthing detector, including multipoint earthing detection part and branch road location detection parts, the multipoint earthing detection part includes constant current source, a current sensor, voltage sensor, control unit, varistor sensor, ampere meter, disconnecting link position sensor and a central processing unit, branch road location detection parts include the 2nd current sensor, first display screen and the 2nd central processing unit, and the multipoint earthing detection part is used for detecting the mutual -inductor common return and whether has the multipoint earthing circumstances, when confirming that there is the multipoint earthing circumstances in the mutual -inductor common return, send first information to branch road location detection parts, and branch road location detection parts are used for investigating one by one each branch road of the neutral conductor and whether have multipoint earthing to there is multipoint earthing's branch road in the location. The utility model discloses can realize whether existing multipoint earthing's detection to the mutual -inductor common return, labour saving and time saving and detection efficiency are high.
Description
Technical field
This utility model relates to high voltage supply technical field, in particular, relates to a kind of transformer common return multipoint earthing detector.
Background technology
In power system, safeguards system safe operation is played very important effect by common return.System is under normal operating conditions; in order to ensure the person and equipment safety; simultaneously in order to ensure the correct work of relay protection and automaton, an electrical connection of " electric operating site safety code " regulation transformer common return must have a reliable earth point.
But, it is various that electric substation common return connects equipment, and expanded range is wide, usually due to artificial wiring error or some inevitable laws of nature, and aging etc. such as insulation, the transformer common return of an electrical connection occurs the situation of multipoint earthing.Owing to the big parts of transformer common return are in outdoor, therefore, the probability of insulation damages is very big, and now, multipoint earthing will cause protection incorrect operation, thus causing large area blackout.
Mainly through the method measuring neutral conductor line zero-sequence current or measurement transformer secondary voltage drop, current power maintainer investigates whether transformer common return exists multipoint earthing, owing to there is no special detection equipment, therefore, detection process is loaded down with trivial details, wasting time and energy, detection efficiency is low.
Utility model content
In view of this, the open a kind of transformer common return multipoint earthing detector of this utility model, to realize the detection that whether transformer common return is occurred multipoint earthing, reach to simplify detection process, improve the purpose of detection efficiency.
A kind of transformer common return multipoint earthing detector, including: multipoint earthing detection part and branch road detection and localization parts；
Described multipoint earthing detection part includes:
For exporting the constant-current source of electric current to the neutral conductor of transformer common return；
For being arranged on the common ground line of the described neutral conductor, detect the earth current value of the common ground point of described transformer common return, and export the first current sensor of described earth current value；
For detecting the voltage-to-ground value of described common ground point, and export the voltage sensor of described voltage-to-ground value；
For receiving the control instruction of user's input, and export the control parts of described control instruction；
For regulating and export the variable-resistance transducer of the resistance value in described transformer common return；
It is connected in series with described variable-resistance transducer, for detecting the ammeter of the current value flowing through described variable-resistance transducer；
For controlling the folding of described transformer common return, and export the disconnecting link position sensor of disconnecting link positional information；
Respectively with described constant-current source, first current sensor, voltage sensor, control parts, variable-resistance transducer, ammeter and disconnecting link position sensor connect, for receiving described earth current value, described voltage-to-ground value, described control instruction, described resistance value, described current value and described disconnecting link positional information, and when receiving described earth current value, switch to shunting detection pattern, when being not received by described earth current value, switch to electric-resistivity method detection pattern, and detecting that described transformer common return exports the first central processing unit of the first information when there is multipoint earthing；
Wherein, described constant-current source, described disconnecting link position sensor, described voltage sensor and be connected in series, by described variable-resistance transducer and described ammeter, the series arm formed and be connected in parallel；
Described branch road detection and localization parts include:
For detecting the grounding current value of each branch road of the described neutral conductor, and export the second current sensor of described grounding current value；
It is connected with described first central processing unit, described second current sensor respectively, for after receiving described first information, each described branch road is detected one by one, and obtain the grounding current value of each described branch road, when detecting that multipoint earthing occurs in certain described branch road, export the second central processing unit of the second information, described second information includes the relevant information of described branch road multipoint earthing occur；
It is connected with described second central processing unit, for showing the first display screen of described second information.
Preferably, described control parts are keyboard.
Preferably, described control parts are touch screen controller.
Preferably, described multipoint earthing detection part, also include:
It is connected with described first central processing unit, for showing the second display screen of described first information.
Preferably, described multipoint earthing detection part, also include:
It is connected with described first central processing unit, for exporting the first alarm device of described first information alarm at described first central processing unit.
Preferably, described first alarm device is light alarm device or audible alarm unit or acoustic-optic alarm.
Preferably, described first alarm device is the communication interface being connected with external alarm equipment.
Preferably, described multipoint earthing detection part, also include:
It is connected with described first central processing unit, for obtaining and store the first data storage of described first information.
Preferably, described first current sensor includes:
For being arranged on the common ground line of the described neutral conductor, detect the earth current of the common ground point of described transformer common return, and export the first clamp on amperemeter of earth current measured value；
It is connected with described clamp on amperemeter and described first central processing unit respectively, for receiving described earth current measured value, described earth current measured value is converted to described earth current value, and by the first analog to digital conversion circuit of described earth current value output to described first central processing unit.
Preferably, described voltage sensor includes:
For detecting the voltage-to-ground of described common ground point, and export the voltmeter of ground voltage measured value；
It is connected with described voltmeter and described first central processing unit respectively, for receiving described ground voltage measured value, described ground voltage measured value is converted to described ground voltage value, and by the second analog to digital conversion circuit of described ground voltage value output to described first central processing unit.
Preferably, described variable-resistance transducer includes:
For regulating and export the slide rheostat of resistance value in described transformer common return；
It is connected with described slide rheostat and described first central processing unit respectively, for receiving described resistance value, described resistance value is converted to digital form resistance value, and by the 3rd mode switching circuit of described digital form resistance value output to described first central processing unit.
Preferably, described disconnecting link position sensor includes:
For controlling the folding of described transformer common return, and export the disconnecting link of disconnecting link positional information；
It is connected with described disconnecting link detecting device and described first central processing unit respectively, for receiving described disconnecting link positional information, described disconnecting link positional information is converted to digital form disconnecting link positional information, and by the 4th analog to digital conversion circuit of described digital form disconnecting link positional information output to described first central processing unit.
Preferably, described second current sensor includes:
For detecting the grounding electric current of each branch road of the described neutral conductor, and export the second clamp on amperemeter of grounding current measurement value；
It is connected with described second clamp on amperemeter and described second central processing unit respectively, for receiving described grounding current measurement value, described grounding current measurement value is converted to described grounding current value, and by the 5th analog to digital conversion circuit of described grounding current value output to described second central processing unit.
Preferably, described branch road detection and localization parts, also include:
It is connected with described second central processing unit, for exporting the Secondary Report alarm device of described second information alarm at described second central processing unit.
Preferably, described branch road detection and localization parts, also include:
It is connected with described second central processing unit, for obtaining and store the second data storage of described second information.
Can be seen that from above-mentioned technical scheme, the utility model discloses a kind of transformer common return multipoint earthing detector, including: multipoint earthing detection part and branch road detection and localization parts, multipoint earthing detection part includes constant-current source, the first current sensor, voltage sensor, control parts, variable-resistance transducer, ammeter, disconnecting link position sensor and the first central processing unit；Branch road detection and localization parts include the second current sensor, the first display screen and the second central processing unit, multipoint earthing detection part has shunting detection pattern and electric-resistivity method detection two kinds of detection patterns of pattern, multipoint earthing detection part is used for detecting whether transformer common return exists multipoint earthing situation, when determining that transformer common return exists multipoint earthing situation, the first information is sent to branch road detection and localization parts, branch road detection and localization parts are for whether the investigation each branch road of the neutral conductor one by one exists multipoint earthing, and position the branch road that there is multipoint earthing.It can be seen that transformer common return multipoint earthing detector disclosed in this utility model can realize the detection whether transformer common return exists multipoint earthing, compared to existing technologies, detection process is time saving and energy saving, thus improve detection efficiency.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to disclosed accompanying drawing.
Fig. 1 is the structural representation of a kind of transformer common return multipoint earthing detector disclosed in this utility model embodiment；
Fig. 2 is the use schematic diagram of a kind of transformer common return multipoint earthing detector disclosed in this utility model embodiment；
Fig. 3 is the structural representation of the disclosed another kind of transformer common return multipoint earthing detector of this utility model embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only this utility model one unit embodiment, rather than whole embodiments.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.
This utility model embodiment discloses a kind of transformer common return multipoint earthing detector, to realize the detection whether transformer common return occurs multipoint earthing, reaches to simplify detection process, improves the purpose of detection efficiency.
Referring to Fig. 1, the structural representation of a kind of transformer common return multipoint earthing detector disclosed in this utility model embodiment, including: multipoint earthing detection part 10 and branch road detection and localization parts 20；
Multipoint earthing detection part 10 includes:
Constant-current source the 11, first current sensor 12, voltage sensor 13, control parts 14, variable-resistance transducer 15, ammeter 16, disconnecting link position sensor 17 and the first central processing unit (CentralProcessingUnit, CPU) 18；
Wherein:
Constant-current source 11 is for exporting electric current to the neutral conductor of transformer common return；
The concrete numerical basis of the output electric current of constant-current source 11 is actually needed and determines, for instance, output electric current is 0-0.2A.
First current sensor 12, for being arranged on the common ground line of the described neutral conductor, detects the earth current value of the common ground point of described transformer common return, and exports described earth current value；
Voltage sensor 13 is for detecting the voltage-to-ground value of described common ground point, and exports described voltage-to-ground value；
Control parts 14 for receiving the control instruction of user's input, and export described control instruction；
Variable-resistance transducer 15 is for regulating and export the resistance value in described transformer common return；
Ammeter 16 and variable-resistance transducer 15 are connected in series, for detecting the current value flowing through variable-resistance transducer 15；
Disconnecting link position sensor 17 is for controlling the folding of described transformer common return, and exports disconnecting link positional information；
Oneth CPU18 respectively with constant-current source 11, first current sensor 12, voltage sensor 13, control parts 14, variable-resistance transducer 15, ammeter 16 and disconnecting link position sensor 17 connect, oneth CPU18 is for receiving the earth current value of the first current sensor 12 output, the voltage-to-ground value of voltage sensor 13 output, control the control instruction of parts 14 output, the resistance value of variable-resistance transducer 15 output, the current value of ammeter 16 detection, and the disconnecting link positional information of disconnecting link position sensor 17 output, and when receiving described earth current value, switch to shunting detection pattern, when being not received by described earth current value, switch to electric-resistivity method detection pattern, and detecting that described transformer common return exports the first information when there is multipoint earthing；
Wherein, first information is that a CPU18 is when being in shunting detection pattern, output electric current according to described earth current value Yu constant-current source 11 is inconsistent, and when being in electric-resistivity method detection pattern, according to the variation relation of the resistance to earth of described common ground point and described earth current value and the resistance change of described variable-resistance transducer 15 inconsistent with the variation relation of electric current time generation.
It should be noted that, oneth CPU18 according to whether receive first current sensor 12 output earth current value so that whether the earth lead judging transformer common return is removed, when earth lead is removed, first current sensor 12 can't detect earth current value, now, current detection mode is switched to electric-resistivity method detection pattern by a CPU18；When earth lead is not removed, the first current sensor 12 detects earth current value, and exports this earth current value to a CPU18, when a CPU18 receives earth current value, current detection mode switches to shunting detection pattern.
Wherein, constant-current source 11, disconnecting link position sensor 17, voltage sensor 13 and be connected in series, by variable-resistance transducer 15 and ammeter 16, the series arm formed and be connected in parallel (not shown).
Branch road detection and localization parts 20 include:
Second current sensor the 21, the 2nd CPU22 and the first display screen 23；
Wherein:
Second current sensor 21 is for detecting the grounding current value of each branch road of the neutral conductor, and exports this grounding current value；
2nd CPU22 is connected with the second current sensor the 21, the oneth CPU18 respectively, for after receiving the first information, each branch road is detected one by one, and obtain the grounding current value of each branch road, when detecting that multipoint earthing occurs in certain branch road, export the second information, described second information includes the relevant information of branch road multipoint earthing occur；
Wherein, the second information be the 2nd CPU22 according to grounding current value corresponding to the branch road that multipoint earthing occurs and constant-current source 11 by a CPU18 feed back to the output electric current of the 2nd CPU22 inconsistent time generation.
First display screen 23 is connected with the 2nd CPU22, is used for showing the second information.
In summary it can be seen, disclosed in this utility model, transformer common return multipoint earthing detector includes: multipoint earthing detection part 10 and 20 liang of parts of branch road detection and localization parts, multipoint earthing detection part 10 detects whether transformer common return exists multipoint earthing situation, when determining that transformer common return exists multipoint earthing situation, the first information is sent to branch road detection and localization parts 20, branch road detection and localization parts 20 investigate whether each branch road of the neutral conductor exists multipoint earthing one by one, and position the branch road that there is multipoint earthing.It can be seen that transformer common return multipoint earthing detector disclosed in this utility model can realize the detection whether transformer common return exists multipoint earthing, compared to existing technologies, detection process is time saving and energy saving, thus improve detection efficiency.
It should be noted that when transformer common return is detected, it is necessary to transformer common return multipoint earthing detector disclosed in this utility model is carried out wiring with transformer common return shown in Fig. 2.
Referring to Fig. 2, the use schematic diagram of a kind of transformer common return multipoint earthing detector disclosed in this utility model embodiment, multipoint earthing detection part 10 in transformer common return multipoint earthing detector 40, ammeter 16 and variable-resistance transducer 15 are connected in series, one end of the common port of disconnecting link position sensor 17, ammeter 16 and voltage sensor 13 is connected to the common ground point 31 of the neutral conductor 30 of transformer common return, and one end of the common port of disconnecting link position sensor 17, variable-resistance transducer 15 and voltage sensor 13 connects earth terminal；Being connected with the common ground point 31 of the neutral conductor 30 by the positive pole of the outfan of constant-current source 11, the negative pole of the outfan of constant-current source 11 connects earth terminal；First current sensor 12 is arranged on the common ground line 32 of the neutral conductor 30, to detect the earth current value of common ground point 31；Branch road detection and localization parts 20 in transformer common return multipoint earthing detector 40, the second current sensor 21 is arranged on the branch road to be measured of the neutral conductor 30, with detection branch earth current value.
The Cleaning Principle of transformer common return multipoint earthing detector 40 is specific as follows:
After transformer common return multipoint earthing detector 40 is opened, first determine whether whether the earth lead of transformer common return is removed, oneth CPU18 according to whether receive first current sensor 12 output earth current value so that whether the earth lead judging transformer common return is removed, when earth lead is removed, first current sensor 12 can't detect earth current value, now, current detection mode is switched to electric-resistivity method detection pattern by a CPU18；When earth lead is not removed, the first current sensor 12 detects earth current value, and exports this earth current value to a CPU18, when a CPU18 receives earth current value, current detection mode switches to shunting detection pattern.
When current detection mode is switched to shunting detection pattern by a CPU18, constant-current source 11 is under the control of a CPU18, electric current is exported to the neutral conductor 30, first current sensor 12 detects the earth current value of the common ground point of transformer common return, and exports earth current value to a CPU18.It addition, the voltage-to-ground of common ground point 31 is measured by voltage sensor 13.Because the neutral conductor 30 is in normal state, only allow the neutral conductor 30 by common ground point 31 one point earth, therefore, if the neutral conductor 30 only connects with ground at common ground point 31 place, then the output electric current of constant-current source 11 and the earth current value that records of the first current sensor 12 are consistent, if showing that the neutral conductor 30 there is also other earth point inconsistent, the output electric current of constant-current source 11 taps from other earth point.Oneth CPU18 is by comparing the output electric current of constant-current source 11 and the earth current value of common ground point 31, can judge whether transformer common return exists multipoint earthing, if there is multipoint earthing, a CPU18 can export the first information to the 2nd CPU22.
When current detection mode is switched to electric-resistivity method detection pattern by a CPU18, in disconnecting link position sensor 17, disconnecting link is opened, and by disconnecting link positional information output a to CPU18, controlling parts 14 slowly to be increased by the CPU18 resistance controlling variable-resistance transducer 15, current resistance value is fed back to a CPU18 by variable-resistance transducer 15.First current sensor 12 is arranged on the common ground line 32 of the neutral conductor 30, to detect earth current, and exports earth current value to a CPU18.Additionally, by voltage sensor 13, the voltage-to-ground of common ground point 31 is measured, if in test process, voltage-to-ground value is constant and when current value reduces with the increase of the resistance value of variable-resistance transducer 15 over the ground, can determine that transformer common return is currently having or multipoint earthing at 2.Oneth CPU18 increases front and back, the relation of the current value that ammeter 16 records by the resistance value of global alignment variable-resistance transducer 15, namely would know that whether transformer common return exists multipoint earthing.
When multipoint earthing detection part 10 detects that transformer common return exists multipoint earthing situation, each branch road of the branch road detection and localization parts 20 neutral conductor 30 to there is multipoint earthing is (see the branch road N shown in figure1, branch road N2... branch road NX) detect, to realize the positioning searching of multipoint earthing point.
Second current sensor 21 is arranged on the branch road to be measured 33 of the neutral conductor 30, after multipoint earthing detection part 10 disconnects the one point earth of secondary circuit, when there is multipoint earthing phenomenon in transformer common return, if multipoint earthing detection part 10 adopts shunting detection, pattern detects, and multipoint earthing detection part 10 persistently can inject low pressure constant current signal source to system；If multipoint earthing detection part 10 adopts electric-resistivity method detection, pattern detects, and multipoint earthing detection part 10 can change the resistance size of variable-resistance transducer 15 according to default fixed frequency.Each branch road using branch road detection and localization parts 20 centering line 30 measures one by one, the grounding current value of the tested branch road collected is compared to judge whether tested branch road exists multipoint earthing by branch road detection and localization parts 20 with the output electric current of constant-current source 11 in multipoint earthing detection part 10, if finding the branch road that there is multipoint earthing, then the relevant information of this branch road is displayed at the first display screen 23.
In summary it can be seen, transformer common return multipoint earthing detector disclosed in this utility model adopts low frequency signal (namely being exported electric current by constant-current source 11 to the neutral conductor of transformer common return) that transformer common return is detected, tested transformer common return is not produced any impact, by the cooperation between multipoint earthing detection part 10 and branch road detection and localization parts 20, just can find out transformer common return and the particular location of multipoint earthing occurs, compared to existing technologies, time saving and energy saving and Detection results good.
Preferably, controlling parts 14 is keyboard, or touch screen controller.
When the situation that transformer common return exists multipoint earthing being detected, for making electric power overhaul personnel find this situation in time, disclosed in this utility model, transformer common return multipoint earthing detector can also have prompt functions.
Therefore, for optimizing above-described embodiment further, referring to Fig. 3, the structural representation of a kind of transformer common return multipoint earthing detector disclosed in another embodiment of this utility model, on the basis of embodiment illustrated in fig. 1, multipoint earthing detection part 10 also includes:
It is connected with a CPU18, for exporting the first alarm device 31 of the first information alarm at a CPU18.
Preferably, the first alarm device 31 is audible alarm unit, and when multipoint earthing detection part 10 detects that multipoint earthing occurs in transformer common return, audible alarm unit sends sound and carries out alarm.
First alarm device 31 can also be light alarm device, and when multipoint earthing detection part 10 detects that multipoint earthing occurs in transformer common return, light alarm device sends high light, red blue light or other light and operator is pointed out.
First alarm device 31 can also be acoustic-optic alarm.
Certainly, this first alarm device 31 can also be a communication interface, and by this by interface, the first information is sent the external alarm equipment connected to this detector communication and realizes reporting to the police by transformer common return multipoint earthing detector.
For optimizing above-described embodiment further, multipoint earthing detection part 10 also includes:
It is connected with a CPU18, for showing the second display screen 32 of the first information.
Second display screen 32 can also show that user passes through to control the control instruction of parts 14 output, the running status of transformer common return and the testing result etc. of transformer common return multipoint earthing detector.
Wherein, the first display screen 23 and second display screen 32 can be all LCDs.
For optimizing above-described embodiment further, multipoint earthing detection part 10 also includes:
It is connected with a CPU18, for obtaining and store the first data storage 33 of described first information.
First data storage 33 is as the extended menory of a CPU18, for storing the routine data of a CPU18, or for storing the operation result (i.e. the first information) of a CPU18, the all previous testing result of the oneth CPU18 is stored, can make staff when necessary by the data output of storage, all previous detection case is analyzed.
In the above-described embodiments, the first current sensor 12 includes: the first clamp on amperemeter 121 and the first analog to digital conversion circuit (AnalogtoDigitalConverter, ADC) 122；
First clamp on amperemeter 121, for being arranged on the common ground line 32 of the neutral conductor 30, to detect the earth current of the common ground point 31 of transformer common return, and exports earth current measured value.
Oneth ADC122 is connected with the first clamp on amperemeter 121 and a CPU18 respectively, for receiving earth current measured value, convert earth current measured value to earth current value, and earth current value exports to a CPU18, using as one of transformer common return whether basis for estimation that multipoint earthing occurs.
In the above-described embodiments, voltage sensor 13 includes: voltmeter 131 and the 2nd ADC132；
Voltmeter 131 is for detecting the voltage-to-ground of common ground point 31, and exports ground voltage measured value.
2nd ADC132 is connected with voltmeter 131 and a CPU18 respectively, for receiving ground voltage measured value, ground voltage measured value is converted to ground voltage value, and ground voltage value is exported to a CPU18, using as one of transformer common return whether basis for estimation that multipoint earthing occurs.
In the above-described embodiments, variable-resistance transducer 15 includes: slide rheostat 151 and the 3rd ADC152；
Slide rheostat 151 is for regulating and resistance value in output mutual inductor common return.
3rd ADC152 is connected with slide rheostat 151 and a CPU18 respectively, for receiving resistance value, resistance value is converted to digital form resistance value, and digital form resistance value is exported to a CPU18, using as one of transformer common return whether basis for estimation that multipoint earthing occurs.
Wherein, slide rheostat 151 being provided with control end, and this control end is connected by the 3rd ADC152 and the one CPU18, slide rheostat 151 receives the CPU18 control instruction sent by controlling termination, and changes the size of resistance according to this control instruction.
In the above-described embodiments, disconnecting link position sensor 17 includes: disconnecting link 171 and the 4th ADC172；
Disconnecting link 171 is for controlling the folding of transformer common return, and exports disconnecting link positional information.
4th ADC172 is connected with disconnecting link the 171, the oneth CPU18 respectively, for receiving described disconnecting link positional information, convert described disconnecting link positional information to digital form disconnecting link positional information, and described digital form disconnecting link positional information is exported to a CPU18, using as one of transformer common return whether basis for estimation that multipoint earthing occurs.
It should be noted that, disconnecting link 171 is provided with control end, and this control end is connected by the 4th ADC172 and the one CPU18, disconnecting link 171 receives the CPU18 folding control instruction sent by controlling termination, and can change deciliter state of disconnecting link according to this folding control instruction.
In the above-described embodiments, the second current sensor 21 includes: the second clamp on amperemeter 211 and the 5th ADC212；
Second clamp on amperemeter 211 is for detecting the grounding electric current of each branch road of the neutral conductor 30, and exports grounding current measurement value；
5th ADC212 is connected with the second clamp on amperemeter 211 and the 2nd CPU22 respectively, for receiving branch earth current measured value, described grounding current measurement value converts grounding current value to, and by described grounding current value output to the 2nd CPU22.
For optimizing above-described embodiment further, branch road detection and localization parts 20 also include:
It is connected with the 2nd CPU22, for exporting the Secondary Report alarm device 24 of the second information alarm at the 2nd CPU22.
Equally, Secondary Report alarm device 24 can also be light crossing-signal, voice guard or audible-visual annunciator.
It should be noted that, second information is displayed by the first display screen 23, Secondary Report alarm device 24 is one to the first display screen 23 and supplements, and when measuring place and being positioned at dim regulator cubicle, transformer common return is occurred that the prompt facility of multipoint earthing is more effective by Secondary Report alarm device 24.
For optimizing above-described embodiment further, branch road detection and localization parts 20 also include:
It is connected with the 2nd CPU22, for obtaining and store the second data storage 25 of described second information.
Second data storage 25 is as the extended menory of the 2nd CPU22, for storing the routine data of the 2nd CPU22, or for storing the operation result (i.e. the second information) of the 2nd CPU22, the all previous testing result of the 2nd CPU22 is stored, can make staff when necessary by the data output of storage, all previous detection case is analyzed.
It should be noted that branch road detection and localization parts 20 can also arrange control parts (not shown), user is by these control parts input control instruction, and controlling brancher detection and localization parts 20 perform corresponding operation.
In summary it can be seen, disclosed in this utility model, transformer common return multipoint earthing detector includes: multipoint earthing detection part 10 and 20 liang of parts of branch road detection and localization parts, multipoint earthing detection part 10 is used for detecting whether transformer common return exists multipoint earthing situation, when determining that transformer common return exists multipoint earthing situation, the first information is sent to branch road detection and localization parts 20, branch road detection and localization parts 20 are for whether the investigation each branch road of the neutral conductor one by one exists multipoint earthing, and position the branch road that there is multipoint earthing.It can be seen that transformer common return multipoint earthing detector disclosed in this utility model can realize the detection whether transformer common return exists multipoint earthing, compared to existing technologies, detection process is time saving and energy saving, thus improve detection efficiency.
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar component mutually referring to.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses this utility model.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein when without departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (15)
1. a transformer common return multipoint earthing detector, it is characterised in that including: multipoint earthing detection part and branch road detection and localization parts；
Described multipoint earthing detection part includes:
For exporting the constant-current source of electric current to the neutral conductor of transformer common return；
For being arranged on the common ground line of the described neutral conductor, detect the earth current value of the common ground point of described transformer common return, and export the first current sensor of described earth current value；
For detecting the voltage-to-ground value of described common ground point, and export the voltage sensor of described voltage-to-ground value；
For receiving the control instruction of user's input, and export the control parts of described control instruction；
For regulating and export the variable-resistance transducer of the resistance value in described transformer common return；
It is connected in series with described variable-resistance transducer, for detecting the ammeter of the current value flowing through described variable-resistance transducer；
For controlling the folding of described transformer common return, and export the disconnecting link position sensor of disconnecting link positional information；
Respectively with described constant-current source, first current sensor, voltage sensor, control parts, variable-resistance transducer, ammeter and disconnecting link position sensor connect, for receiving described earth current value, described voltage-to-ground value, described control instruction, described resistance value, described current value and described disconnecting link positional information, and when receiving described earth current value, switch to shunting detection pattern, when being not received by described earth current value, switch to electric-resistivity method detection pattern, and detecting that described transformer common return exports the first central processing unit of the first information when there is multipoint earthing；
Wherein, described constant-current source, described disconnecting link position sensor, described voltage sensor and be connected in series, by described variable-resistance transducer and described ammeter, the series arm formed and be connected in parallel；
Described branch road detection and localization parts include:
For detecting the grounding current value of each branch road of the described neutral conductor, and export the second current sensor of described grounding current value；
It is connected with described first central processing unit, described second current sensor respectively, for after receiving described first information, each described branch road is detected one by one, and obtain the grounding current value of each described branch road, when detecting that multipoint earthing occurs in certain described branch road, export the second central processing unit of the second information, described second information includes the relevant information of described branch road multipoint earthing occur；
It is connected with described second central processing unit, for showing the first display screen of described second information.
2. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described control parts are keyboard.
3. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described control parts are touch screen controller.
4. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described multipoint earthing detection part, also includes:
It is connected with described first central processing unit, for showing the second display screen of described first information.
5. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described multipoint earthing detection part, also includes:
It is connected with described first central processing unit, for exporting the first alarm device of described first information alarm at described first central processing unit.
6. transformer common return multipoint earthing detector according to claim 5, it is characterised in that described first alarm device is light alarm device or audible alarm unit or acoustic-optic alarm.
7. transformer common return multipoint earthing detector according to claim 5, it is characterised in that described first alarm device is the communication interface being connected with external alarm equipment.
8. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described multipoint earthing detection part, also includes:
It is connected with described first central processing unit, for obtaining and store the first data storage of described first information.
9. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described first current sensor includes:
For being arranged on the common ground line of the described neutral conductor, detect the earth current of the common ground point of described transformer common return, and export the first clamp on amperemeter of earth current measured value；
It is connected with described clamp on amperemeter and described first central processing unit respectively, for receiving described earth current measured value, described earth current measured value is converted to described earth current value, and by the first analog to digital conversion circuit of described earth current value output to described first central processing unit.
10. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described voltage sensor includes:
For detecting the voltage-to-ground of described common ground point, and export the voltmeter of ground voltage measured value；
It is connected with described voltmeter and described first central processing unit respectively, for receiving described ground voltage measured value, described ground voltage measured value is converted to described ground voltage value, and by the second analog to digital conversion circuit of described ground voltage value output to described first central processing unit.
11. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described variable-resistance transducer includes:
For regulating and export the slide rheostat of resistance value in described transformer common return；
It is connected with described slide rheostat and described first central processing unit respectively, for receiving described resistance value, described resistance value is converted to digital form resistance value, and by the 3rd mode switching circuit of described digital form resistance value output to described first central processing unit.
12. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described disconnecting link position sensor includes:
For controlling the folding of described transformer common return, and export the disconnecting link of disconnecting link positional information；
It is connected with described disconnecting link detecting device and described first central processing unit respectively, for receiving described disconnecting link positional information, described disconnecting link positional information is converted to digital form disconnecting link positional information, and by the 4th analog to digital conversion circuit of described digital form disconnecting link positional information output to described first central processing unit.
13. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described second current sensor includes:
For detecting the grounding electric current of each branch road of the described neutral conductor, and export the second clamp on amperemeter of grounding current measurement value；
It is connected with described second clamp on amperemeter and described second central processing unit respectively, for receiving described grounding current measurement value, described grounding current measurement value is converted to described grounding current value, and by the 5th analog to digital conversion circuit of described grounding current value output to described second central processing unit.
14. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described branch road detection and localization parts, also include:
It is connected with described second central processing unit, for exporting the Secondary Report alarm device of described second information alarm at described second central processing unit.
15. transformer common return multipoint earthing detector according to claim 1, it is characterised in that described branch road detection and localization parts, also include:
It is connected with described second central processing unit, for obtaining and store the second data storage of described second information.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620179814.0U CN205404719U (en) | 2016-03-09 | 2016-03-09 | Mutual -inductor common return multipoint earthing detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620179814.0U CN205404719U (en) | 2016-03-09 | 2016-03-09 | Mutual -inductor common return multipoint earthing detector |
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| CN205404719U true CN205404719U (en) | 2016-07-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957568A (en) * | 2017-11-23 | 2018-04-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Secondary Circuit of Potential Transformer multipoint earthing Quick positioning instrument and lookup method |
| CN108614195A (en) * | 2018-06-22 | 2018-10-02 | 广东电网有限责任公司 | Substation PT N600 ground connection on-line monitoring positioning device and method |
| CN113169543A (en) * | 2018-11-28 | 2021-07-23 | 康明斯发电Ip公司 | System and method for ground fault detection in power systems using communication networks |
-
2016
- 2016-03-09 CN CN201620179814.0U patent/CN205404719U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107957568A (en) * | 2017-11-23 | 2018-04-24 | 中国南方电网有限责任公司超高压输电公司柳州局 | Secondary Circuit of Potential Transformer multipoint earthing Quick positioning instrument and lookup method |
| CN108614195A (en) * | 2018-06-22 | 2018-10-02 | 广东电网有限责任公司 | Substation PT N600 ground connection on-line monitoring positioning device and method |
| CN113169543A (en) * | 2018-11-28 | 2021-07-23 | 康明斯发电Ip公司 | System and method for ground fault detection in power systems using communication networks |
| CN113169543B (en) * | 2018-11-28 | 2024-08-13 | 康明斯发电Ip公司 | System and method for ground fault detection in a power system using a communication network |
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