CN105676034A - On-line monitoring method for fault of heater of switch cabinet - Google Patents
On-line monitoring method for fault of heater of switch cabinet Download PDFInfo
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- CN105676034A CN105676034A CN201610119013.XA CN201610119013A CN105676034A CN 105676034 A CN105676034 A CN 105676034A CN 201610119013 A CN201610119013 A CN 201610119013A CN 105676034 A CN105676034 A CN 105676034A
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- heater
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- current transformer
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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
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- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to an on-line monitoring method for a fault of a heater of a switch cabinet. According to the method, a Rogowski coil type current transformer is used as a core and is used for monitoring a current of a heater; and a primary current of the heater is converted into a secondary small voltage, so that a current signal of working of the heater is obtained. With a micro transformer and a rectifier module, the working voltage of the heater is converted into a secondary direct-current small voltage, so that the working voltage signal of the heater is obtained and the voltage can serve as a follow-up circuit power supply. The voltage and current signals are processed comprehensively and an LED is used for displaying, so that two kinds of states of working and fault of the heater can be reflected. Therefore, a problem of difficult fault monitoring of the heater in the switch cabinet can be solved.
Description
Technical field
The invention belongs to power transformation operation field, relate to switch cubicle, especially a kind of switch cubicle heater failure on-line monitoring method.
Background technology
Power switch cabinet is the important electric power facility of transmission, distribution electric energy, and its stability directly affects grid stability and power supply reliability. When switch cubicle humidity is too high, serious consequence can be caused. At present, in switch cubicle, the method for control humiture mostly is and utilizes heater dehumidifying and heat, and is controlled by intelligent temperature and humidity controller and is automatically adjusted.
Power switch cabinet inner structure is compact, is integrated with the power equipments such as chopper, spark gap, transformer and protection device, and humiture environmental requirement in cabinet is harsh, hence with heater, cabinet environment is adjusted. But, inside switch cabinet electromagnetic environment is complicated, and heater and Intelligent humiture controller often break down, and temperature and humidity controller does not possess the function of monitoring heater whether fault; Owing to existing in switch cubicle, Keep Clear-High Voltage; common tour can not be opened cabinet door and heater is checked, and is therefore difficult to find heater failure, and long-time humiture can affect the properly functioning of electrical equipment in cabinet extremely in switch cubicle; serious even causes gliding spark discharge, causes power outage.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art part, there is provided a kind of easy for installation, do not affect the normal operation of former heater, can indicate that heater whether fault, facilitate the transformer substation switch heater counter on-line monitoring method that operation maintenance personnel is maked an inspection tour, ensured switch cubicle health failure-free operation.
This invention address that technical problem be the technical scheme is that
A kind of switch cubicle heater failure on-line monitoring method, by the power circuit of switch cubicle heater traverse Luo-coil current transformer, rectification module in parallel is surveyed in Current Transformer Secondary, rectification module is sequentially connected with smoothing capacitor, sampling resistor, work indication light diode, using sampling resistor both end voltage as Luo-coil output voltage VI;
Miniature transformer in parallel and rectification module thereof on heater working power line, miniature transformer and rectification module connect a voltage comparator circuit, heater running voltage is converted to 5V DC voltage by miniature transformer and rectification module, and using this voltage supply voltage as voltage comparator circuit, an adjustable resistance in parallel after direct voltage output, as threshold reference voltage Vset;
Comparison circuit input Luo-coil current transformer output voltage VI and threshold reference voltage Vset, when the output voltage of Luo-coil current transformer more than threshold reference voltage time, it is determined that heater normal operation; When the output voltage of Luo-coil current transformer less than threshold reference voltage time, it is determined that heater failure, fault-signal pass through indicating fault diode displaying.
And, described Luo-coil current transformer is straight-through current transformer, does not interrupt former operating circuit.
The present invention, with Luo-coil type current transformer for core, being monitored the electric current of heater, heater primary current being transformed to secondary small voltage, thus monitoring the current value of heater by Luo-coil current transformer; By miniature transformer and rectification module, heater running voltage is converted to secondary direct current small voltage; By voltage and current signal integrated treatment, thus reflecting heater work, fault two states. The problem solving the internal heater malfunction monitoring such as switch cubicle, terminal box difficulty.
(1) current monitoring
Luo-coil is made up of the copper conductor being surrounded on annular nonmagnetic material skeleton, constitute the straight-through current transformer of annular, due to the particularity of magnetic core, therefore this current transformer is absent from the phenomenons such as non-linear, magnetic saturation and is also absent from Current Transformer Secondary tripping hazard. The theory structure of Rogowski coil current sensor is as shown in Figure 1. Including non magnetic ring skeleton, and the secondary coil being looped around on skeleton.
When current carrying conductor of heater is from the traverse of the coil loop heart, producing magnetic field B around conductor, according to Ampere circuital theorem, conductor ambient magnetic field strength B is proportional to the electric current I in current－carrying conductorN。
We assume that, the field homogeneity around conductor through the skeleton of Luo-coil, and secondary coil is evenly distributed on skeleton.
According to the law of electromagnetic induction, the induced electromotive force that secondary coil produces is proportional to the electric current in a current－carrying conductor. When primary side flow through root-mean-square be with sinusoidal current time, the output voltage root-mean-square valve of Luo-coil is:
E=ω MIN
Wherein: E is the output voltage root-mean-square value of Luo-coil
ω=2 π f=314rad/s is power-frequency voltage circular frequency;
M is the mutual inductance of Luo-coil.
INIt it is current effective value in a current－carrying conductor.
After Luo-coil Current Transformer Secondary side electric current is carried out rectification, sampling resistor in parallel, just can be reflected by sampling resistor both end voltage through the electric current in Luo-coil center conductor, i.e. the operating current of heater, current monitoring artwork figure such as accompanying drawing 1.
(2) current and voltage signals integrated treatment:
By miniature transformer and rectification module, heater running voltage is converted to 5V DC voltage, using this voltage supply voltage as signal processing circuit. When secondary side has voltage, it is determined that heater source voltage exists.
Design threshold voltages comparison circuit, when the output voltage of Luo-coil more than threshold voltage time, it is determined that heater normal operation; When the output voltage of Luo-coil less than threshold voltage time, it is determined that heater failure. Current and voltage signals integrated treatment circuit theory diagrams such as accompanying drawing 2. Current/voltage integrated treatment logic chart is as shown in Figure 3.
Advantages of the present invention and having the benefit effect that
1, present method solves operation maintenance personnel and terminal box internal heater is maked an inspection tour the big problem of difficulty, effectively monitor the health status of switch cubicle internal heater, it is to avoid switch cubicle endogenous cause of ill condensation and the second short circuit that causes, even major accident occurs.
2, this method principle is simple, does not affect the normal operation of former heater.Can indicate that heater work, fault, disable three kinds of states, facilitate operation maintenance personnel and make an inspection tour, ensure the healthy trouble-free operation of switch cubicle.
Accompanying drawing explanation
Fig. 1 is that Luo-coil is to the acquisition principle figure of electric current in conductor;
Fig. 2 is current and voltage signals integrated treatment circuit theory diagrams;
Fig. 3 monitors system logic schematic diagram;
Detailed description of the invention
Below in conjunction with accompanying drawing and by specific embodiment, the invention will be further described, and following example are illustrative, are not determinate, it is impossible to limit protection scope of the present invention with this.
A kind of switch cubicle internal heater on-line monitoring method, is arranged on the power circuit 2 of switch cubicle heater by Luo-coil current transformer 1, by power circuit traverse current transformer. Survey rectification module 3 in parallel in Current Transformer Secondary, after rectification module, connect smoothing capacitor 4 and sampling resistor 5 and work indication light diode 6, and using sampling resistor both end voltage as Luo-coil output voltage VI。
On heater working power line, miniature transformer in parallel and rectification module 7 thereof, be converted to 5V DC voltage by heater running voltage. Using this voltage supply voltage as threshold voltage comparison circuit 8, and after voltage exports adjustable resistance 9 in parallel, as threshold reference voltage Vset. The output voltage V of comparison circuit input Luo-coilI, and threshold reference voltage Vset, when Luo-coil output voltage is more than threshold voltage time, it is determined that heater normal operation; When the output voltage of Luo-coil less than threshold voltage time, it is determined that heater failure. Fault-signal is shown by indicating fault light emitting diode 10.
This method utilizes current transformer that the operating current of heater is converted, and draws energy from heater working power, by the bright of work indication light diode and indicating fault light emitting diode and dark judgement heater work, fault two states. Thus effectively monitoring the health status of heater, it is to avoid switch cubicle endogenous cause of ill condensation and the generation that causes a serious accident.
When described on-line fault monitoring device exists fault, do not affect the properly functioning of former heater.
The present invention, through laboratory test, complies fully with the requirement in " State Grid Corporation of China's electric power safety working regulation (power transformation part) ", can apply at the scene.
Above-described is only the preferred embodiment of the present invention, it is noted that for the person of ordinary skill of the art, under the premise without departing from inventive concept, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention.
Claims (2)
1. a switch cubicle heater failure on-line monitoring method, it is characterized in that: by the power circuit of switch cubicle heater traverse Luo-coil current transformer, rectification module in parallel is surveyed in Current Transformer Secondary, rectification module is sequentially connected with smoothing capacitor, sampling resistor, work indication light diode, using sampling resistor both end voltage as Luo-coil output voltage VI;
Miniature transformer in parallel and rectification module thereof on heater working power line, miniature transformer and rectification module connect a voltage comparator circuit, heater running voltage is converted to 5V DC voltage by miniature transformer and rectification module, and using this voltage supply voltage as voltage comparator circuit, an adjustable resistance in parallel after direct voltage output, as threshold reference voltage Vset;
Comparison circuit input Luo-coil current transformer output voltage VI and threshold reference voltage Vset, when the output voltage of Luo-coil current transformer more than threshold reference voltage time, it is determined that heater normal operation;When the output voltage of Luo-coil current transformer less than threshold reference voltage time, it is determined that heater failure, fault-signal pass through indicating fault diode displaying.
2. a kind of switch cubicle heater failure on-line monitoring method according to claim 1, it is characterised in that: Luo-coil current transformer is straight-through current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610119013.XA CN105676034B (en) | 2016-03-02 | 2016-03-02 | A kind of switchgear heater failure on-line monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610119013.XA CN105676034B (en) | 2016-03-02 | 2016-03-02 | A kind of switchgear heater failure on-line monitoring method |
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| Publication Number | Publication Date |
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| CN105676034A true CN105676034A (en) | 2016-06-15 |
| CN105676034B CN105676034B (en) | 2018-08-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980064A (en) * | 2017-05-11 | 2017-07-25 | 沈阳恒久安泰环保与节能科技有限公司 | The online failure detector of solid heat storage boiler heating module |
| CN113063999A (en) * | 2021-03-11 | 2021-07-02 | 北京北方华创微电子装备有限公司 | Method and system for diagnosing heater in semiconductor process equipment |
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| JPH0658960A (en) * | 1992-08-04 | 1994-03-04 | Central Res Inst Of Electric Power Ind | Power line measuring apparatus |
| CN102622015A (en) * | 2012-03-30 | 2012-08-01 | 苏州苏海亚电气有限公司 | Condensation controller |
| CN202586512U (en) * | 2012-03-16 | 2012-12-05 | 刘春元 | Induction power-taking unit for illuminating lamps |
| CN202904409U (en) * | 2012-11-28 | 2013-04-24 | 重庆市电力公司检修分公司 | Monitoring device for transformer station terminal box heater |
| CN103645395A (en) * | 2013-11-15 | 2014-03-19 | 四川圣维信息技术有限公司 | Isolation and protection circuit for high-voltage live-line monitoring |
| CN104237604A (en) * | 2014-08-28 | 2014-12-24 | 国家电网公司 | Current monitoring warning device for overhead transmission line |
| CN105203872A (en) * | 2015-09-10 | 2015-12-30 | 国网天津市电力公司 | Substation terminal box heater monitoring method |
| CN105203833A (en) * | 2015-11-09 | 2015-12-30 | 国家电网公司 | High-voltage electrical equipment high-current impulse counting device and counting method |
-
2016
- 2016-03-02 CN CN201610119013.XA patent/CN105676034B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0658960A (en) * | 1992-08-04 | 1994-03-04 | Central Res Inst Of Electric Power Ind | Power line measuring apparatus |
| CN202586512U (en) * | 2012-03-16 | 2012-12-05 | 刘春元 | Induction power-taking unit for illuminating lamps |
| CN102622015A (en) * | 2012-03-30 | 2012-08-01 | 苏州苏海亚电气有限公司 | Condensation controller |
| CN202904409U (en) * | 2012-11-28 | 2013-04-24 | 重庆市电力公司检修分公司 | Monitoring device for transformer station terminal box heater |
| CN103645395A (en) * | 2013-11-15 | 2014-03-19 | 四川圣维信息技术有限公司 | Isolation and protection circuit for high-voltage live-line monitoring |
| CN104237604A (en) * | 2014-08-28 | 2014-12-24 | 国家电网公司 | Current monitoring warning device for overhead transmission line |
| CN105203872A (en) * | 2015-09-10 | 2015-12-30 | 国网天津市电力公司 | Substation terminal box heater monitoring method |
| CN105203833A (en) * | 2015-11-09 | 2015-12-30 | 国家电网公司 | High-voltage electrical equipment high-current impulse counting device and counting method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980064A (en) * | 2017-05-11 | 2017-07-25 | 沈阳恒久安泰环保与节能科技有限公司 | The online failure detector of solid heat storage boiler heating module |
| CN113063999A (en) * | 2021-03-11 | 2021-07-02 | 北京北方华创微电子装备有限公司 | Method and system for diagnosing heater in semiconductor process equipment |
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| CN105676034B (en) | 2018-08-31 |
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