CN203747379U - Anti-error locking device in case of current in active current pressing plate - Google Patents
Anti-error locking device in case of current in active current pressing plate Download PDFInfo
- Publication number
- CN203747379U CN203747379U CN201420089913.0U CN201420089913U CN203747379U CN 203747379 U CN203747379 U CN 203747379U CN 201420089913 U CN201420089913 U CN 201420089913U CN 203747379 U CN203747379 U CN 203747379U
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- locking device
- pressing plate
- circuit
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- electric current
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Abstract
The utility model relates to an anti-error locking device in the case of current in an active current pressing plate, which comprises an AC current sensing and sampling circuit, and is characterized in that the AC current sensing and sampling circuit is connected with a soft switch; the soft switch is connected with a power amplifying circuit and a flashing alarm circuit; the power amplifying circuit is connected with a voice alarm circuit and a forced locking device. According to the anti-error locking device in the case of current in the active current pressing plate, indication and alarming can be carried out in the case of current in a differential protection AC current loop, and the purpose of preventing switching operation and CT connection piece error operation incidents in protection test work can be achieved.
Description
Technical field
The utility model relates to relay protection of power system and security fields, and especially a kind of active formula electric current pressing plate has stream anti-misoperation locking device.
Background technology
110kV and the above main transformer microcomputer based relay protective device of domestic production at present; generally all at the screen end, arrange the CT brace (also claiming electric current pressing plate) that differential protection is used is installed, while facilitating main transformer protection test or side for grid switching operation, carry out the switching of current circuit.But be not all equipped with a kind of device of the CT of reflection brace real-time current; while causing operating CT brace, cannot judge whether CT brace now has electric current to pass through; be unfavorable for preventing that differential protecting CT brace from switching unsafe incidents by mistake; operating personnel are when switching; cannot concisely judge whether mistake to switch the CT brace that has stream, in the operating process of CT brace, have larger potential safety hazard.Existing microcomputer anti-error technology does not have exploitation to relate to the error-proof device of second protection pressing plate, CT brace yet.
" relay protection of power system and automatic safety device " operation, in checking experiment often because system operation mode changes or checking experiment need of work; the current circuit brace that must shield by dish (or claim CT brace, CT pressing plate, lower with) to its alternating current loop drop into, the operation such as short circuit, open circuit.And in operation or the checking experiment course of work; operation field exists at current circuit to be had miscarrying in stream situation, cuts the possibility of current circuit by mistake, thereby brings malfunction or tripping to cause the security risk of power grid accident to normal operating relaying protection or automatic safety device.Protection malfunction, tripping accident that this type of current circuit brace miscarry, cuts by mistake in system, mistake short circuit causes emerge in an endless stream, and the technological means that prevents misoperation blank almost.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of active formula electric current pressing plate stream anti-misoperation locking device.
The utility model adopts following scheme to realize: a kind of active formula electric current pressing plate has stream anti-misoperation locking device, comprise an alternating current induction sample circuit, it is characterized in that: described alternating current induction sample circuit connects a soft switch, described soft switch connects a power amplification circuit and a flash alarm circuit, and described power amplification circuit connects a voice alarm circuit and a forced locking device.
In the utility model one embodiment, also comprise a power-supplying circuit, described power-supplying circuit connects described soft switch.
In the utility model one embodiment, described alternating current induction sampling unit adopts straight-through current transformer.
In the utility model one embodiment, described power amplification circuit is comprised of integrated circuit LM386.
In the utility model one embodiment, described forced locking device is on electric current pressing plate, to install an organic clear glass baffle plate additional, and described organic clear glass baffle plate is beneficial to iron bar the effect that the electromagnetic lock other with being arranged at electric current pressing plate plays forced blocking operation jointly.
Indication and alarm when the utility model can have in differential protection alternating current loop stream; thereby can reach, take precautions against the object that CT brace misoperation fault occurs in grid switching operation and protection test work; can be for needing a set of secondary operation error-proof device of main transformer differential protection configuration of other generation operation in electric power system; eliminate the security risk of secondary pressure plate misoperation initiation protection malfunction tripping operation power grid accident, the needs of satisfied safety in production; after successful Application, can be generalized to the identical occasion of National Power System, can obtain good safety economy benefit.
For making the purpose of this utility model, technical scheme and advantage clearer, below will, by specific embodiment and relevant drawings, the utility model be described in further detail.
Accompanying drawing explanation
Fig. 1 is system principle diagram of the present utility model.
Fig. 2 is forced locking device closure state schematic diagram of the present utility model.
Fig. 3 is the not closed view of forced locking device of the present utility model.
Fig. 4 is forced locking device circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, the utility model provides a kind of active formula electric current pressing plate to have stream anti-misoperation locking device, comprise an alternating current induction sample circuit, described alternating current induction sample circuit connects a soft switch, described soft switch connects a power amplification circuit and a flash alarm circuit, and described power amplification circuit connects a voice alarm circuit and a forced locking device; Also comprise a power-supplying circuit, described power-supplying circuit connects described soft switch.Preferably, described alternating current induction sampling unit adopts straight-through current transformer.
Alternating current induction sample circuit is by high-sensitive straight-through current transformer; the electric current induction that the secondary AC current circuit of protection and automatics is passed through generates secondary current; the capacitance-resistance voltage forming by halfwave rectifier, as the trigger condition that opens and closes soft switch.Power-supplying circuit directly adopts the DC power supply (+-110V) on the relay-set at place, transformer station installation site, by voltage divider, obtains stable 12V power supply, and Power supply loop carries fuse, sky is opened protection.
Power amplification circuit is comprised of integrated circuit LM386, is characterized in that magnification distortion is little, and noise is low, can be comparatively true to nature restore voice content, sound is loud and clear, auditory effect is good.
Warning circuit is comprised of voice alarm circuit and flash alarm circuit; Comprise speech chip, light-emitting diode, power amplification circuit, loud speaker, NE555 circuit.Photoflash lamp adopts LED as flash of light source, and little because LED has volume, brightness is strong, and the life-span is long, the little many merits that waits of current sinking, LED chooses redness, and redness is the representative of caution notice, easily allow people enhance your vigilance, and red wavelength is long, easily allows people realize.As shown in Figures 2 and 3, described forced locking device is on CT brace (also claiming electric current pressing plate), to install an organic clear glass baffle plate additional, and described organic clear glass baffle plate is beneficial to iron bar the effect that the electromagnetic lock other with being arranged at electric current pressing plate plays forced blocking operation jointly.Described organic clear glass baffle plate can be loaded onto very easily and be taken off when the no current of loop.Organic clear glass baffle plate end view is L-shaped, the recessed rectangle iron bar that is embedded with in positive forward position.A rectangle electromagnetic lock is installed in top at relaying protection electric current pressing plate (CT brace).When corresponding relaying protection CT loop has electric current to pass through electric current pressing plate (arbitrary road is greater than 20mA), electromagnetic lock will can firmly hold the organic clear glass baffle plate that inserts electromagnetic lock by the relay generation powerful magnetic force that switches on power, and makes it to be difficult for taking off.Be that organic clear glass baffle plate coordinates with the electromagnetic lock of electric current pressing plate top the effect of playing forced blocking operation.A unlock switch also can be equipped with in this locking device side, in particular cases, the electromagnetic lock of locking is carried out to power-off unlocking operation.
As shown in Figure 4, pressing plate current detection signal samples through step-up transformer, through rectifier bridge W1 output direct current signal, make C1 charging and make C2 charging through R1, C2 reaches certain value, trigger DB conducting, drives Q1 conducting, makes luminous tube DS1 flash of light, make light B2 action simultaneously, send pulse signal, light lotus root pulse signal is through input I1 input CPU, and CPU exports a low level, make Q3 conducting, thereby make speech chip, drive chip and loudspeaker work, when pressing testing button (being installed on panel), loudspeaker will send chimes of doom; CPU exports a high level simultaneously and makes Q2 conducting, and luminous tube is bright, and it is current-limiting resistance that indication has electricity, R4.When without external power supply, this indicating device can only have electricity by luminous tube DS2 indication; While having electricity, 03 output of CPU is exported a high level, by R7, makes Q4 conducting, relay J I action, the contact JI1 of JI and JI2 output locking contact.
Above-listed preferred embodiment; the purpose of this utility model, technical scheme and advantage are further described; institute is understood that; the foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (5)
1. an active formula electric current pressing plate has stream anti-misoperation locking device, comprise an alternating current induction sample circuit, it is characterized in that: described alternating current induction sample circuit connects a soft switch, described soft switch connects a power amplification circuit and a flash alarm circuit, and described power amplification circuit connects a voice alarm circuit and a forced locking device.
2. active formula electric current pressing plate according to claim 1 has stream anti-misoperation locking device, it is characterized in that: also comprise a power-supplying circuit, described power-supplying circuit connects described soft switch.
3. active formula electric current pressing plate according to claim 1 has stream anti-misoperation locking device, it is characterized in that: described alternating current induction sampling unit adopts straight-through current transformer.
4. active formula electric current pressing plate according to claim 1 has stream anti-misoperation locking device, it is characterized in that: described power amplification circuit is comprised of integrated circuit LM386.
5. active formula electric current pressing plate according to claim 1 has stream anti-misoperation locking device, it is characterized in that: described forced locking device is on electric current pressing plate, to install an organic clear glass baffle plate additional, described organic clear glass baffle plate is beneficial to iron bar the effect that the electromagnetic lock other with being arranged at electric current pressing plate plays forced blocking operation jointly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420089913.0U CN203747379U (en) | 2014-02-28 | 2014-02-28 | Anti-error locking device in case of current in active current pressing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420089913.0U CN203747379U (en) | 2014-02-28 | 2014-02-28 | Anti-error locking device in case of current in active current pressing plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747379U true CN203747379U (en) | 2014-07-30 |
Family
ID=51347138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420089913.0U Expired - Fee Related CN203747379U (en) | 2014-02-28 | 2014-02-28 | Anti-error locking device in case of current in active current pressing plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747379U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812085A (en) * | 2014-02-28 | 2014-05-21 | 国家电网公司 | Lockout device for preventing misoperation of active current pressing plate under condition of current |
| CN104166017B (en) * | 2014-08-08 | 2016-09-14 | 国家电网公司 | A kind of pressing plate error proof cover for reaying protection test |
-
2014
- 2014-02-28 CN CN201420089913.0U patent/CN203747379U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812085A (en) * | 2014-02-28 | 2014-05-21 | 国家电网公司 | Lockout device for preventing misoperation of active current pressing plate under condition of current |
| CN103812085B (en) * | 2014-02-28 | 2016-06-29 | 国家电网公司 | Active electric current pressing plate has stream anti-misoperation locking device |
| CN104166017B (en) * | 2014-08-08 | 2016-09-14 | 国家电网公司 | A kind of pressing plate error proof cover for reaying protection test |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 |