CN106093683B - Heater broken wire detection system and wire break detection method - Google Patents
Heater broken wire detection system and wire break detection method Download PDFInfo
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- CN106093683B CN106093683B CN201610512405.2A CN201610512405A CN106093683B CN 106093683 B CN106093683 B CN 106093683B CN 201610512405 A CN201610512405 A CN 201610512405A CN 106093683 B CN106093683 B CN 106093683B
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- 238000001514 detection method Methods 0.000 title claims abstract description 90
- 230000003111 delayed effect Effects 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The present invention relates to heater broken wire detection system and wire break detection methods, detection system includes at least one detection unit, detection unit includes three heaters, each phase in three-phase alternating current passes through a corresponding heater and is connected to a tie point, and tie point connects zero curve by connection line；Detection unit further includes the current measuring device for detecting the out-of-balance current in connection line.When actively cutting off heater, electric current superposition value is zero, and current detecting and judgment module will not report disconnection signal by mistake, so, when this mode is able to solve auto controlled heater investment or cutting the problem of wrong report disconnection signal.Meanwhile less component can be used to monitor more heaters.
Description
Technical field
The present invention relates to heater disconnection monitoring fields, and in particular to heater broken wire detection system and burn out detection side
Method.
Background technique
Regardless of heater used in heater used in family or factory, power supply is alternating current, single-phase
Alternating current is powered it, so, it can obtain what whether heater broke by the current values in detection power supply line
Information.
Currently used heater wire break detection method be undercurrent detection, the principle utilized is: when heating installation power supply just
Chang Shi, there is certain electric currents in power supply line；When heating installation power supply route disconnects, i.e., when heater breaks, supply lines
The electric current of road is very small or does not just have electric current.So detecting the confession of heater first when carrying out heater burn out detection
Electric current in electric line judges that the heater breaks, or judge the heater failure if being lower than normal value certain amplitude.
This mode can detect to a certain extent whether heater breaks, and still, actively cut if not using heater
When the power supply line of disconnected heater, since electric current being equally not present in power supply line, then, it is based on above-mentioned undercurrent detection mode
Detection device will issue heater disconnection information, cause to judge by accident.
Summary of the invention
The object of the present invention is to provide a kind of heater broken wire detection systems, are heating to solve existing detection device
The problem of device will appear erroneous judgement when actively cutting off power supply line.Present invention simultaneously provides a kind of heater wire break detection methods.
To achieve the above object, the solution of the present invention includes a kind of heater broken wire detection system, including at least one inspection
Unit is surveyed, the detection unit includes three heaters, and each phase in three-phase alternating current passes through a corresponding heater
It is connected to the same tie point, the tie point connects zero curve by connection line；The detection unit further includes for detecting
Out-of-balance current in the connection line and the current measuring device that broken string judgement is carried out according to out-of-balance current.
The detection unit further includes signal output apparatus, and the current measuring device output connects the signal output dress
It sets, for the outputting alarm signal when measurement result is more than the comparison threshold value of a setting.
The detection unit further includes the control switch that string is located in the connection line, the current measuring device control
The control switch is connected, for the control disconnection control switch when measurement result is more than the comparison threshold value of a setting.
The current measuring device is the coiler part of a relay, and the control switch is the touching of the relay
Point.
The detection system includes three detection units.
A kind of heater wire break detection method based on above-mentioned heater broken wire detection system, firstly, detection connection line
On electric current, obtain corresponding current value, then, the size of current value threshold value compared with preset works as institute
When stating current value less than the relatively threshold value, determine that the heater in corresponding detection unit does not break；When the current value is big
When the relatively threshold value, determine that broken string situation occurs in the heater in corresponding detection unit.
When the current value is greater than the relatively threshold value, signal output apparatus outputting alarm signal.
When the current value is greater than the relatively threshold value, after the setting time that is delayed, signal output apparatus outputting alarm letter
Number.
When the current value is greater than the relatively threshold value, control disconnects control switch.
When the current value is greater than the relatively threshold value, after the setting time that is delayed, control disconnects control switch.
Heater broken wire detection system provided by the invention includes at least one detection unit, and each detection unit is one
Independent detection device, each detection unit can detect one group of heater, so, which can be according to reality
Border needs to meet the flexibility of detection, also, when multiple detection units are arranged to increase or reduce detection device, can
Multiple groups heater is detected, the efficiency of detection is improved.
Moreover, each phase in three-phase alternating current passes through a corresponding heater for any one detection unit
It is connected to the same tie point, which connects zero curve by connection line, detects the connecting line using current measuring device
The out-of-balance current of road, detection be three heating installation power supply electric currents superposition value, so, if three heaters are normal
Work, when not breaking, electric current superposition value is zero or is small value, obtains the conclusion of three heaters normal work；If
When three heater status are inconsistent, such as when a phase or two-phase break, electric current superposition value has certain numerical value, is had
The conclusion of heater broken string.So being able to detect whether heater breaks in this way.
Most of all, electric current superposition value is zero when actively cutting off heater, current measuring device will not be reported by mistake disconnected
Line, so, this mode is able to solve the problem of will not reporting broken string by mistake when auto controlled heater is cut off.
Detailed description of the invention
Fig. 1 is heater broken wire detection system principle schematic diagram；
Fig. 2 is heater wire breakage detector circuit theory schematic diagram.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
Embodiment 1
Heater broken wire detection system includes heater wire breakage detector and corresponding heater, i.e., by heater pair
It should be mounted in detection device and just constitute the detection system, so, the detection device is described in detail below.
Heater wire breakage detector includes at least one detection unit, and each detection unit is an individual test section
Point, it is independent of each other between detection unit, the number of detection unit can be set according to actual needs, for the ease of saying
Bright, the present embodiment is by taking three detection units as an example, as shown in Figure 1.
As shown in Figure 1, heater wire breakage detector includes three detection units, the structure phase of these three detection units
Together, so, the present embodiment is illustrated by taking first detection unit as an example.
As shown in Fig. 2, the detection unit includes three pairs of connectivity ports, first pair is A1 and A2, and second pair is B1 and B2, the
Three pairs are C1 and C2, this three pairs of connectivity ports are used to the feeder ear of connection heater, so, a detection unit has access to
Three heaters, A1 connect first heater with A2, and B1 connects second heater with B2, and C1 connects third heating with C2
Device.
A in three-phase alternating current is connected port A1, port A2 connection points of common connection M；Similarly, in three-phase alternating current
B be connected port B1, port B2 connection points of common connection M；C in three-phase alternating current is connected port C1, port C2 connection
Points of common connection M, points of common connection M connect zero curve by connection line.So by the way that three heater correspondences are linked into phase
On the connectivity port answered, it can be implemented as three heating installation power supplies.
The detection unit further includes current measuring device and signal output apparatus.Current measuring device can be one
Integral device, for example be able to carry out the electronic mutual inductor of data processing can also be and is formed by connecting by several component parts
Structure, for example be made of current detecting part and data processing part, data processing section sampling connection current detecting part.Electricity
Stream detection part is used to detect the electric current in the connection line between points of common connection M and zero curve, and data processing section is used for root
Broken string judgement is carried out according to the electric current of detection.Wherein, current detecting part can be the equipment such as current transformer, data processing section
It can be the equipment such as control chip；Signal output apparatus is the equipment for capableing of output correlation signal, such as alarm.
According to the above-mentioned mode of connection, that flow through current detecting part is the superposition value I of three-phase heater supply currentABC。
The Thoughts of the current measuring device are the out-of-balance currents detected in connection line, according to the electric current detected
To carry out broken string judgement, working principle are as follows: when three heating installation power supplies are normal, i.e., when being happened without broken string, three
A heater status is consistent, since the power of three heaters under normal conditions is same or similar, then, in connection line
The superposition value I of three electric currentsABCIt is zero or is small value, which may be added by three-phase four-wire system AC power source or three
The error of hot device power (resistance value) causes；When these three heater status are inconsistent, for example, occur in which a heater or
When the power supply line breaking of two heaters of person, the superposition value I of three electric currents in connection lineABC=wherein heat phase device
Electric current I when electric current normal heating1(virtual value).So a comparison threshold value is arranged in data processing section, add when three
When hot device powers normal, i.e., when being happened without broken string, superposition value IABCLess than the comparison threshold value；When three heaters
When middle appearance broken string situation, superposition value IABCIt is greater than the comparison threshold value.By comparing actual electric current superposition value threshold value compared with
Size realize broken string detection.
When the electric current superposition value detected, which is greater than, compares threshold value, data processing section is judged as broken string, and defeated to signal
Device exports corresponding signal out, and signal output apparatus issues alarm signal, and staff's having heaters is notified broken string occur
Failure.
In addition, being arranged in determination strategy to eliminate heater investment or breaking moment issuable false positive signal
One delay time value.It when being judged as broken string, is delayed after the delay time value of above-mentioned setting, data processing section controls signal
Output device outputting alarm signal.
If three heaters accessing in the detection unit while occurring to break (damage), which be will be unable to
Judgement broken string situation.But due to each heater whether occur to break (damage) event be it is independent, according to probability theory, this
The probability P of three heaters while damage that are accessed in detection unitABC=PA×PB×PC(PA, PB, PCRespectively one of them
The probability of heater failure), so PABCVery small, when Practical, can be ignored.
In addition, when actively cutting off heater, for example heater is not used, using cutting off these three heaters simultaneously
Mode (or directly cut off AC power source), I at this timeABCIt is zero, current detecting part is due to the electric current I that detectsABCLess than dynamic
Work value (compares threshold value), so, data processing section will not report disconnection information by mistake.Therefore which is able to solve when actively cutting
The problem of reporting disconnection information when heater by mistake.
Embodiment 2
In the present embodiment, be not provided with signal output apparatus in detection unit, but be arranged string be located at points of common connection M with
The control switch in connection line between zero curve or ground, current measuring device control connects the control switch, in this implementation
In example, current measuring device is the coiler part of an overcurrent relay JR, and control switch is on the overcurrent relay
Contact.
The strategy for carrying out broken string judgement according to electric current superposition value in current measuring device is same as Example 1.
In order to guarantee relay appropriate action, the specific value of above-mentioned relatively threshold value is suitably set in relay (also referred to as
Electric current action value) and the action delay time.
The setting principle of electric current action value is, wherein an electric current when heat phase device electric current normal heating is (when normal work
Supply current) I150% or so be advisable.Due to three-phase four-wire system AC power source or the mistake of three-phase heater power (resistance value)
Difference, action value setting is too low to will lead to wrong report disconnection signal, and action value sets excessively high will lead to and fails to report disconnection signal.
Delay time value refers to that when being judged as broken string, contact delay certain time acts.The reason of setting is to eliminate to add
Hot device investment or breaking moment issuable false positive signal.
In short, issuing broken string letter when the electric current superposition value that the coiler part of overcurrent relay detects is greater than action value
Breath, and the contact in relay is disconnected after the setting time that is delayed, realize the purpose of three heating installation power supply routes of cutting.
Moreover, the control signal of control switch is provided by current measuring device, and need to be set as self-sustaining mode, with
The control signal of current measuring device automatically resets and leads to control switch again after avoiding control switch from disconnecting three-phase heater
Restore closed state.
In addition, when actively cutting off heater, for example heater is not used, using cutting off these three heaters simultaneously
Mode (or directly cut off AC power source), I at this timeABCIt is zero, overcurrent relay JR is due to the electric current I that detectsABCIt is less than
Action value, so, relay will not act, i.e., will not report disconnection information by mistake.So which is able to solve when actively cutting adds
The problem of reporting disconnection information when hot device by mistake.
The detection and judgement of electric current are carried out using overcurrent relay, if there are multiple detections logical in the overcurrent relay
If road, then, an overcurrent relay can be applied to multiple detection units.
In addition, in order to convenient to comparing threshold value and actuation time is adjusted, above-mentioned overcurrent relay can be with
It is electronic relay relatively advanced at present.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in introduction according to the present invention
The model of shape, formula, parameter do not need to spend creative work.It is right without departing from the principles and spirit of the present invention
The change, modification, replacement and modification that embodiment carries out are still fallen in protection scope of the present invention.
Claims (10)
1. a kind of heater broken wire detection system, which is characterized in that including at least one detection unit, the detection unit includes
Three heaters, each phase in three-phase alternating current passes through a corresponding heater and is connected to the same tie point, described
Tie point connects zero curve by connection line；The detection unit further includes for detecting the imbalance electricity in the connection line
Flow and carry out according to out-of-balance current the current measuring device of broken string judgement.
2. heater broken wire detection system according to claim 1, which is characterized in that the detection unit further includes signal
Output device, the current measuring device output connect the signal output apparatus, for being more than a setting in measurement result
Outputting alarm signal when comparing threshold value.
3. heater broken wire detection system according to claim 1, which is characterized in that the detection unit further includes that string is set
Control switch in the connection line, the current measuring device control connect the control switch, for tying in measurement
Control disconnects the control switch when fruit is more than the comparison threshold value of a setting.
4. heater broken wire detection system according to claim 3, which is characterized in that the current measuring device is one
The coiler part of relay, the control switch are the contact of the relay.
5. heater broken wire detection system according to claim 1, which is characterized in that the detection system includes three institutes
State detection unit.
6. a kind of heater wire break detection method based on heater broken wire detection system described in claim 1, which is characterized in that
Firstly, the electric current in detection connection line, obtains corresponding current value, and then, the current value and preset ratio
Compared with the size of threshold value, when the current value is less than the relatively threshold value, determine that the heater in corresponding detection unit does not break
Line；When the current value is greater than the relatively threshold value, determine that broken string situation occurs in the heater in corresponding detection unit.
7. heater wire break detection method according to claim 6, which is characterized in that when the current value is greater than the ratio
When compared with threshold value, signal output apparatus outputting alarm signal.
8. heater wire break detection method according to claim 7, which is characterized in that when the current value is greater than the ratio
When compared with threshold value, after the setting time that is delayed, signal output apparatus outputting alarm signal.
9. heater wire break detection method according to claim 6, which is characterized in that when the current value is greater than the ratio
When compared with threshold value, control disconnects control switch.
10. heater wire break detection method according to claim 9, which is characterized in that described in being greater than when the current value
When comparing threshold value, after the setting time that is delayed, control disconnects control switch.
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| CN201610512405.2A CN106093683B (en) | 2016-06-29 | 2016-06-29 | Heater broken wire detection system and wire break detection method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761270A (en) * | 2018-08-18 | 2018-11-06 | 无锡诚勇自动化技术有限公司 | A kind of wire break alarm |
| CN110456839A (en) * | 2019-08-27 | 2019-11-15 | 昌龙兴科技（深圳）有限公司 | A kind of intelligent temperature control system based on PID |
| CN113945778B (en) * | 2020-07-17 | 2024-09-10 | 中国石油化工股份有限公司 | Multi-stage heating state monitoring device of electric roasting furnace |
| CN112054492B (en) * | 2020-09-09 | 2023-06-27 | 南方电网数字电网研究院有限公司 | Phase failure detection method, device, storage medium and distribution gateway |
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