CN203490273U - On-line monitoring system for earth current of transformer iron core - Google Patents
On-line monitoring system for earth current of transformer iron core Download PDFInfo
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- CN203490273U CN203490273U CN201320519132.6U CN201320519132U CN203490273U CN 203490273 U CN203490273 U CN 203490273U CN 201320519132 U CN201320519132 U CN 201320519132U CN 203490273 U CN203490273 U CN 203490273U
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Abstract
An on-line monitoring system for an earth current of a transformer iron core includes a CPU, a current limiting circuit and an earth current monitoring circuit. The earth current monitoring circuit includes an iron core earth current monitoring circuit and a clamping member earth current monitoring circuit. The iron core earth current monitoring circuit includes an iron core current transformer and a first rectification filter, and an input signal of the iron core current transformer is an iron core earth current and connected with a PA11 port of the CPU after being rectified and filtered via the first rectification filter. The clamping member earth current monitoring circuit includes a clamping member earth current transformer and a second rectification filter, and an input signal of the clamping member earth current transformer is a clamping member earth current and connected with a PA12 port of the CPU after being rectified and filtered via the second rectification filter. An input terminal of the current limiting circuit is connected with a port PE of the CPU. The on-line monitoring system for the earth current of the transformer iron core is simple in structure and can be applied to any power transformer.
Description
Technical field
The utility model relates to a kind of monitoring system to power transformer iron core ground current, particularly a kind of can on-line monitoring and automatic or manual ground current is limited in to the device in specialized range, belong to transformer technology field.
Background technology
Power transformer is one of electrical equipment important in electric system, and its operation conditions is directly connected to the safety and stablization of Operation of Electric Systems.Statistical study to Accident of Transformer shows, accident unshakable in one's determination is occupied higher ratio in the total accident of transformer.And the generation of fault unshakable in one's determination, major part is because multipoint earthing unshakable in one's determination causes.When there is multipoint earthing in iron core, have sizable electric current and flow through iron core, cause local overheating unshakable in one's determination, when serious, can cause localized burn, so need carry out Real-Time Monitoring and control to transformer fe electric current in the heart.At present both at home and abroad the monitoring method of power transformer iron core ground current is summed up and mainly contains following three kinds:
Method one: tour personnel regularly use current clamp to do iron core grounding electric current band electro-detection, General Requirements 220kV and above transformer are measured 1 time for 6 months, the transformer of 110kV is measured 1 time for 1 year, because twice preventive trial is longer interval time, for transfinite fault and solve failure problems and have very long hysteresis quality of the ground current of burst.
Method two: analog current table monitoring method.The method is directly to seal in analog current table in the iron core grounding line of transformer, for monitoring grounding electric current.After tour personnel find that electric current exceeds standard, then take further step, as manually sealed in resistance in ground loop, sometimes even make transformer out of service, carry out malfunction elimination.The disadvantage of the method is can not Measurement accuracy iron core grounding electric current, once this is because multipoint earthing appears in transformer, electric current in its ground loop can reach tens peaces, therefore for monitoring the range of the reometer of electric current unshakable in one's determination, must (be generally tens peaces very greatly, otherwise reometer can blow because electric current is excessive, cause ground loop open circuit), and transformer under normal circumstances, electric current in its iron core grounding line is again very little (generally several milliampere to tens milliamperes), GB stipulates that the threshold value of its electric current can not surpass 100mA, so little electric current does not almost have reading on the reometer of wide range like this.In addition, there is too fault handling problem not in time in the method.
Method three: based on digitized measurement mechanism.The method is to utilize current sensor to gather the current signal in iron core grounding line, and signal is sent into PC, DSP or single-chip microcomputer after pretreatment, and PC, DSP or single-chip microcomputer carry out analyzing and processing to signal, if exceeded standard, provide alerting signal.This method can only play the effect that ground current is monitored and exceeded standard and report to the police, processing after electric current exceeds standard still can not be carried out automatically by manually completing, there is equally fault handling problem not in time, and can not effectively carry out the preservation of data, be not easy to fault analysis afterwards, function ratio is more single.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, provide a kind of can carry out Real-Time Monitoring to the iron core in power transformer and folder, and can automatically and manually they be limited in to the Transformer Core Grounding electric current on-line monitoring system in specialized range.
Problem described in the utility model is solved by following technical scheme:
A Transformer Core Grounding electric current on-line monitoring system, it comprises CPU, current-limiting circuit and ground current observation circuit; Described ground current observation circuit is divided into iron core grounding current monitoring circuit and clamp earthing current observation circuit; Described iron core grounding current monitoring circuit comprises current transformer unshakable in one's determination, the first rectifier filer, and the input signal of described current transformer unshakable in one's determination is iron core grounding electric current, after the first rectifier filer rectifying and wave-filtering, is connected with the PA11 port of CPU; Described clamp earthing current observation circuit comprises clamp earthing current mutual inductor, the second rectifier filer, and the input signal of described clamp earthing current mutual inductor is clamp earthing current, after the second rectifier filer rectifying and wave-filtering, is connected with the PA12 port of CPU; The input end of described current-limiting circuit is connected with the port PE of CPU.
Above-mentioned Transformer Core Grounding electric current on-line monitoring system, described current-limiting circuit comprises current-limiting resistor network unshakable in one's determination, folder current-limiting resistor network and pilot relay group; Described pilot relay group is comprised of the first relay～ten relay, and the control signal input end of described the first relay～ten relay is connected with the PE0～PE9 port on CPU respectively; Described current-limiting resistor network unshakable in one's determination comprises one group of resistance and the first relay normally closed contact～five relay normally closed contact, described one group of resistance is respectively the first resistance, the second resistance, the 3rd resistance, the 4th resistance and the 5th resistance, and described the first resistance～four resistance is connected in series with the second relay normally closed contact～five relay normally closed contact afterwards, is connected into parallel circuit with the normally closed contact of the 5th resistance and the first relay again.
Above-mentioned Transformer Core Grounding electric current on-line monitoring system, described folder current-limiting resistor network comprises one group of resistance and the 6th relay normally closed contact～ten relay normally closed contact, described one group of resistance is respectively the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance, and described the 6th resistance～nine resistance is connected in series with the 7th relay normally closed contact～ten relay normally closed contact afterwards, is connected into parallel circuit with the normally closed contact of the tenth resistance and the 6th relay again.
Above-mentioned Transformer Core Grounding electric current on-line monitoring system, sets up mode setting circuit and communication system, and the signal output part of described mode setting circuit is connected with the signal input part of CPU; The signal input part of described communicating circuit is connected with the signal output part of CPU.
Above-mentioned Transformer Core Grounding electric current on-line monitoring system, set up warning system, described warning system comprises alarm unshakable in one's determination and folder alarm, the signal input part of described alarm unshakable in one's determination is connected with the signal output part of CPU, and the signal input part of described folder alarm is connected with the signal output part of CPU.
Above-mentioned Transformer Core Grounding electric current on-line monitoring system, sets up reservoir and display circuit, and the data input pin of described display circuit is connected with the data output end on CPU; The data input pin of described reservoir is connected with the data output end of CPU.
The utility model utilizes current transformer to gather the ground current signal of transformer core and folder, by CPU, can accurately judge whether ground current exceeds standard, when electric current exceeds standard, CPU passes through current-limiting circuit, make within the ground current of iron core or folder is limited in the scope of regulation all the time, unlikely generation further damages.In addition, set up mode setting circuit, can as required mode of operation be adjusted to on-line monitoring, automatic current limiting or manual current limliting mode of operation, CPU preserves data by reservoir, is convenient to accident be analyzed afterwards.The utility model not only can carry out Real-Time Monitoring to power transformer iron core and clamp earthing current, can also automatically they be limited in specialized range, guarantees power transformer safe operation.And, after having an accident, can notify staff to rush to repair timely by warning circuit and communication module.
Accompanying drawing explanation
Fig. 1 is the utility model electrical schematic diagram;
Fig. 2 is current-limiting resistor network circuit diagram unshakable in one's determination;
Fig. 3 is folder current-limiting resistor network circuit diagram.
In figure, each list of reference numerals is: 1.CPU, 2. mode setting circuit, 3. display circuit, 4. current-limiting resistor network unshakable in one's determination, 5. folder current-limiting resistor network, 6. communicating circuit, 7. warning circuit, 8. reservoir, Z1 the first rectifier filer, Z2 the second rectifier filer, D1. current transformer unshakable in one's determination, D2. folder current transformer, R0.～R9. the first resistance～ten resistance, J1-1～J10-1. the first relay normally closed contact～ten relay normally closed contact, J1.～J10. the first relay～ten relay.
Embodiment
Referring to Fig. 1, current transformer in the utility model is transformed into the current signal of unshakable in one's determination and folder to send into CPU after voltage signal and analyze judgement, CPU judges according to size of current whether iron core or folder have multipoint earthing phenomenon, if have, automatically drop into appropriate electrical and hinder current limit within the scope of GB regulation.
The utility model arranges mode of operation by mode setting circuit, such as can mode of operation being set to three kinds, is respectively on-line monitoring, automatic current limiting and manually current limliting.The device of pattern setting can adopt two waveres.The data output end of described waver is connected with the data input pin of CPU, and CPU is by reading the state of waver and then the mode of operation of regulating system.
The utility model has also been set up display circuit 3, warning circuit 7 and communicating circuit 6, not only realized that refreshing in real time of unshakable in one's determination, clamp earthing current value shows and the inquiry of historical data shows, also realized monitoring, alarming and immediately notified the effect of staff's handling failure.Communicating circuit adopts RS485 and two kinds of communication modes of GPRS, can select arbitrarily according to field condition.In addition, on CPU, be also furnished with reservoir 8, be convenient to record and the fault analysis of historical failure.
The circuit connecting mode of current-limiting resistor network unshakable in one's determination 4 of the present utility model and folder current-limiting resistor network 5 can be set to be connected in series or be connected in parallel, and what Fig. 2 and Fig. 3 provided is the connected mode of parallel circuit.
Referring to Fig. 2, current-limiting resistor network unshakable in one's determination 4 of the present utility model comprises one group of resistance and the first relay normally closed contact J1-1～five relay normally closed contact J5-1, described one group of resistance is respectively the first resistance R 0, the second resistance R 1, the 3rd resistance R 2, the 4th resistance R 3 and the 5th resistance R 4, and described the first resistance R 0～four resistance R 3 is connected in series with the second relay normally closed contact J2-1～five relay normally closed contact J5-1 afterwards, is connected into parallel circuit with the normally closed contact J-1 of the 5th resistance R 4 and the first relay again.When need increase resistance, only need to disconnect the normally closed contact of the first relay J 1-1.In addition, the utility model, after disconnecting the first relay J 1-1, also can disconnect the normally closed contact of all the other relays successively, is used for adjusting resistance values.
Referring to Fig. 3, folder current-limiting resistor network 5 of the present utility model comprises one group of resistance and the 6th relay normally closed contact～ten relay normally closed contact, described one group of resistance is respectively the 6th resistance R 5, the 7th resistance R 6, the 8th resistance R 7, the 9th resistance R 8 and the tenth resistance R 9, and described the 6th resistance R 5～nine resistance R 8 is connected in series with the 7th relay normally closed contact J7-1～ten relay normally closed contact J10-1 afterwards, is being connected into parallel circuit with the normally closed contact J6-1 of the tenth resistance R 9 and the 6th relay.When need increase resistance, only need to disconnect the normally closed contact of the 6th relay J 6-1.In addition, the utility model, after disconnecting the 6th relay J 6-1, also can disconnect the normally closed contact of all the other relays successively, is used for adjusting resistance values.
In the utility model, CPU adopts arm processor, and display circuit adopts 5.7 cun of graphic dot matrix liquid crystal DMT32240T057, and communicating circuit adopts MAX3232 and MAX3485, and rectifier filer adopts LM324.
Claims (6)
1. a Transformer Core Grounding electric current on-line monitoring system, is characterized in that: it comprises CPU(1), current-limiting circuit and ground current observation circuit; Described ground current observation circuit is divided into iron core grounding current monitoring circuit and clamp earthing current observation circuit; Described iron core grounding current monitoring circuit comprises current transformer unshakable in one's determination (D1), the first rectifier filer (Z1), the input signal of described current transformer unshakable in one's determination (D1) is iron core grounding electric current, after the first rectifier filer (Z1) rectifying and wave-filtering, is connected with the PA11 port of CPU (1); Described clamp earthing current observation circuit comprises clamp earthing current mutual inductor (D2), the second rectifier filer (Z2), the input signal of described clamp earthing current mutual inductor (D2) is clamp earthing current, after the second rectifier filer (Z2) rectifying and wave-filtering, is connected with the PA12 port of CPU (1); The input end of described current-limiting circuit and CPU(1) port PE be connected.
2. Transformer Core Grounding electric current on-line monitoring system according to claim 1, is characterized in that: described current-limiting circuit comprises current-limiting resistor network unshakable in one's determination (4), folder current-limiting resistor network (5) and pilot relay group, described pilot relay group is comprised of the first relay (J1)～tenth relay (J10), and the control signal input end of described the first relay (J1)～tenth relay (J10) is connected with the PE0～PE9 port on CPU (1) respectively, described current-limiting resistor network unshakable in one's determination (4) comprises one group of resistance and the first relay normally closed contact (J1-1)～5th relay normally closed contact (J5-1), described resistance is respectively the first resistance (R0), the second resistance (R1), the 3rd resistance (R2), the 4th resistance (R3) and the 5th resistance (R4), after described the first resistance (R0)～4th resistance (R3) is connected in series with the second relay normally closed contact (J2-1)～5th relay normally closed contact (J5-1) respectively, be connected into parallel circuit with the normally closed contact (J1-1) of the 5th resistance (R4) and the first relay again.
3. Transformer Core Grounding electric current on-line monitoring system according to claim 2, it is characterized in that: described folder current-limiting resistor network (5) comprises one group of resistance and the 6th relay normally closed contact (J6-1)～tenth relay normally closed contact (J10-1), described resistance is respectively the 6th resistance (R5), the 7th resistance (R6), the 8th resistance (R7), the 9th resistance (R8) and the tenth resistance (R9), after described the 6th resistance (R5)～9th resistance (R9) is connected in series with the 7th relay normally closed contact (J7-1)～tenth relay normally closed contact (J10-1) respectively, be connected into parallel circuit with the normally closed contact (J6-1) of the tenth resistance (R9) and the 6th relay again.
4. Transformer Core Grounding electric current on-line monitoring system according to claim 3, it is characterized in that: set up mode setting circuit (2) and communication system (6), the signal output part and CPU(1 of described mode setting circuit (2)) signal input part be connected; The signal input part and CPU(1 of described communicating circuit (6)) signal output part be connected.
5. Transformer Core Grounding electric current on-line monitoring system according to claim 4, it is characterized in that: set up warning system (7), described warning system (7) comprises alarm unshakable in one's determination and folder alarm, the signal input part of described alarm unshakable in one's determination is connected with the signal output part of CPU, and the signal input part of described folder alarm is connected with the signal output part of CPU.
6. Transformer Core Grounding electric current on-line monitoring system according to claim 5, is characterized in that: set up reservoir (8) and display circuit (3), the data input pin of described display circuit (3) is connected with the data output end on CPU (1); The data input pin and CPU(1 of described reservoir (8)) data output end be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320519132.6U CN203490273U (en) | 2013-08-25 | 2013-08-25 | On-line monitoring system for earth current of transformer iron core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320519132.6U CN203490273U (en) | 2013-08-25 | 2013-08-25 | On-line monitoring system for earth current of transformer iron core |
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| Publication Number | Publication Date |
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| CN203490273U true CN203490273U (en) | 2014-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320519132.6U Expired - Fee Related CN203490273U (en) | 2013-08-25 | 2013-08-25 | On-line monitoring system for earth current of transformer iron core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316824A (en) * | 2014-11-18 | 2015-01-28 | 国家电网公司 | On-line iron core grounding current monitoring device |
| CN108241103A (en) * | 2018-01-19 | 2018-07-03 | 广东电网有限责任公司茂名供电局 | A kind of low pressure becomes platform electric leakage monitor and alarm system and its alarming method by monitoring |
-
2013
- 2013-08-25 CN CN201320519132.6U patent/CN203490273U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316824A (en) * | 2014-11-18 | 2015-01-28 | 国家电网公司 | On-line iron core grounding current monitoring device |
| CN108241103A (en) * | 2018-01-19 | 2018-07-03 | 广东电网有限责任公司茂名供电局 | A kind of low pressure becomes platform electric leakage monitor and alarm system and its alarming method by monitoring |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20190825 |
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| CF01 | Termination of patent right due to non-payment of annual fee |