CN102331757B - Online detecting system and detecting method for outlet circuit of non-electric quantity protective device - Google Patents
Online detecting system and detecting method for outlet circuit of non-electric quantity protective device Download PDFInfo
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- CN102331757B CN102331757B CN2011101955317A CN201110195531A CN102331757B CN 102331757 B CN102331757 B CN 102331757B CN 2011101955317 A CN2011101955317 A CN 2011101955317A CN 201110195531 A CN201110195531 A CN 201110195531A CN 102331757 B CN102331757 B CN 102331757B
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Abstract
The invention discloses an online detecting system and detecting method for an outlet circuit of a non-electric quantity protective device. The system comprises a contact sensor module, a switching value acquiring module and an automatic detecting and processing module, wherein the automatic detecting and processing module comprises a duty relay; the contact sensor module is connected with the automatic detecting and processing module, and is used for transmitting control circuit state information; the switching value acquiring module is used for receiving external acquisition input value and transmitting the external acquisition input value to the automatic detecting and processing module; and the automatic detecting and processing module is used for receiving a detection startup GOOSE (Generic Object Oriented Substation Event) message and the external acquisition input value from the switching value acquiring module, judging whether a detection result is accordant with the expectation, and outputting a logical judged result to an external monitoring system through an MMS (Multimedia Messaging Service). Due to the adoption of the device and the method, the problem of detection of the outlet circuit of the conventional non-electric quantity protective device is solved, and a necessary condition is created for realizing detection of a secondary operation circuit of an entire power system.
Description
Technical field
What the present invention relates to is a kind of protective device and method of technical field of power systems, specifically is a kind of outlet loop online detection system and detection method that is used for the non electrical quantity protective device.
Background technology
The outlet loop of non electrical quantity protective device utilizes non-electric quantity to the circuit that electric primary equipment transformer controls when being transformer fault, be an important component part of non-electric quantity protective.Require to carry out under the situation of repair based on condition of component at the non electrical quantity protective device; Action outlet loop as the non electrical quantity protective device; Traditional non electrical quantity protective device outlet loop of existing widespread usage obviously can not meet the demands because of not possessing functions such as automatic detection, data remote.
Tradition non electrical quantity protective device action outlet loop circuit breaking or pressing plate might occur and not drop into the abnormal conditions that cause tripping as requested owing to long-play or other reason in the loop.The timely diagnosis of this abnormal conditions is very important for non electrical quantity protection correct operation.Yet it is reported in the transformer station at home and can only manually regularly detect that existing this detection method needs manual work to operate at the scene still not to the online test method of traditional non electrical quantity protective device outlet loop, inefficiency, and also sense cycle is long.
Through the retrieval of prior art is found: in June, 2009 Nanrui Jibao Electric Co., Ltd " technology and the operation instructions " of PCS-222B intelligent operation box in intelligent microcomputer type control box and its implementation of a kind of complete function are disclosed; This PCS-222B intelligent operation box has been realized functions such as isolating switch status surveillance, control loop inspection, isolating switch breaker tripping and closing operation, supports the GOOSE message.But this prior art is just kept watch on and has been inserted the optocoupler sensor traditional jumping position being kept watch on, closed the position; Sensor loop is not monitored; Do not have monitoring breaker signal circuit, conventional relay protection circuit, this prior art does not possess non electrical quantity protection loop monitoring yet.
Further retrieval is found; Chinese patent document number CN 101764432A; Open day 2010-6-30 has put down in writing a kind of " intelligent operation box with action connection point self-checking function ", and this technology has realized functions such as isolating switch status surveillance, control loop inspection, isolating switch breaker tripping and closing operation; The self checking method of digitizing operation contact also is provided, has also supported the GOOSE message.But this prior art is only in the operation circuit, and the sticking dead phenomenon of the relay tip that damage probability is very little has been carried out real-time monitoring, in this realizes, has also introduced monitoring circuit, and this technology is the ability in tool monitoring non electrical quantity protection loop not equally.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists; A kind of outlet loop online detection system and detection method that is used for the non electrical quantity protective device is provided; Can realize that (towards the service of transformer substation case general object, it supports the exchange by the common data of data set organization through GOOSE (Generic Object Oriented Substation Event).Be mainly used in and be implemented in locking and the tripping operation that realizes defencive function between a plurality of devices with defencive function.) whether differentiate primary equipment out of service, when primary equipment normally moves, do not detect.When primary equipment is out of service, automatically traditional non electrical quantity protective device outlet loop is detected.The outlet loop that has solved traditional non electrical quantity protective device detects problem, thereby is that necessary condition has been created in the detection that realizes whole electric system secondary operation loop.
The present invention realizes through following technical scheme:
The present invention relates to a kind of outlet loop online detection system that is used for the non electrical quantity protective device; Comprise: contact sensor assembly, switch acquisition module and contain the automatic detection processing module of moving relay; Wherein: the contact sensor assembly links to each other with automatic detection processing module and transmits the control loop status information; The switch acquisition module receives outside the collection and opens into amount and be delivered to automatic detection processing module, detects processing module automatically and receives to detect to start the GOOSE message and gather from the outside of switch acquisition module and open into amount and differentiate whether accord with expectation and differentiate the result to the outer monitoring system through MMS message service output logic of testing result;
Described automatic detection processing module comprises: communications processor element, switch acquisition interface unit, relay control unit and monitoring CPU, wherein: the outer monitoring system is differentiated, receives in the GOOSE message service of communications processor element reception exterior I ED with the realization testing conditions MMS message service starts control relay and begins to monitor to realize detection startup command, the outside manual detection startup command of reception after the monitoring CPU is differentiated.
Described contact sensor assembly comprises: automatic switch element and safety assurance unit; Wherein: the safety assurance unit strings is received in the electric primary equipment transformer operation control circuit; The automatic switch element is unidirectional conducting diode, and conducting was also through non electrical quantity protection cable, pressing plate and the automatic processing module formation monitoring closed loop that detects when positive and negative counter-rotating took place the current potential of this unidirectional conducting diode at two ends.
Described switch acquisition module adopts the on off state acquisition circuit that has the optocoupler sensor, and this on off state acquisition circuit is arranged in the non electrical quantity protective device and opening into mode collecting work status information and export automatic detection processing module to through the optocoupler sensor.
The present invention relates to the detection method of said system, may further comprise the steps:
The first step, detect processing module automatically and carry out the precondition that outlet loop detects and differentiate: only when the primary equipment transformer is out of service, just carry out the subsequent step of non electrical quantity protective device outlet loop detection.
Described precondition differentiation is meant:
1.1) communications processor element obtains the isolating switch cut-off signal according to the GOOSE message of exterior I ED;
1.2) the monitoring CPU judges: when receiving that each side isolating switch GOOSE position message signals of transformer is 10, then each side circuit breaker position of transformer is for dividing the position; Continue to judge each side low current actuating signal of transformer that when receiving that low current signal GOOSE position message signals is 1, then each side electric current of transformer is lower than does not have the stream threshold; The outlet loop detection entry condition of then differentiating for the non electrical quantity protective device satisfies, and execution in step 1.3);
1.3) the corresponding operation of relay control unit driving relay tip is closed and carried out for second step, otherwise stop detection.
Second step, detect processing module automatically and carry out the control power supply status that outlet loop detects next step and differentiate: only when the control power supply opening, just carry out the subsequent step of non electrical quantity protective device outlet loop detection.
Described control power supply status is differentiated concrete steps and is comprised:
2.1) detect processing module automatically and drive the operation relay and return, carry out effect to returning correctness;
2.2) through switch acquisition module monitors state from 1 closed loop to 0, judge leaving the loop contact and whether returning of the second and the 3rd operation relay, forward the continuation execution of the 3rd step to; When then stopping self check above the testing conditions of unmet differentiation still behind the 300ms, judgement time directly returns.
The 3rd step, detect that processing module drive to detect the first and the 4th operation relay automatically leave the loop junction closure; Switch non electrical quantity protection working power polarity; The automatic switch conducting of the contact sensor assembly that install at non electrical quantity protection contact place also forms closed loop with the switch acquisition module, and the switch acquisition module outputs to automatic detection processing module with information.
The 4th goes on foot, detects automatically processing module judges that the sign array among the sign array of working as the loop state in the switch acquisition module information of receiving and the non electrical quantity that should the drop into protection Policy Table is identical; Then the N/R testing result of the outlet loop of non electrical quantity protective device is uploaded the station level network with the MMS message pattern and carried out for the 5th step, otherwise the testing result that the outlet loop of non electrical quantity protective device is unusual is uploaded station level network and detection of end with the MMS message pattern.
The 5th step, automatically detect processing module drive the 4th operation relay leave that the loop contact returns, the leaving the loop junction closure and form closed loop of the 5th operation relay with the switch acquisition module, the switch acquisition module outputs to automatic detection processing module with information.
The 6th step, automatically detect processing module judge when the sign array of the switch acquisition module information loop state of receiving identical with sign array in the device detection table, then with the non electrical quantity protective device or a N/R testing result in loop upload the station level network with the MMS message pattern; Otherwise with the non electrical quantity protective device or a door loop unusual testing result upload the station level network with the MMS message pattern, realize the outlet loop Intelligent Measurement.
The present invention discharges the outlet contact of all distant place switching values such as outlet to gas export, overtemperature outlet, the pressure of traditional non electrical quantity protective device; Self check fast and accurately; And it is rationally effective to detect step, satisfies the requirement of " protection of electric system non electrical quantity and automatic safety device anti-accident measures main points " fully.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a contact sensor assembly synoptic diagram.
Fig. 3 detects the processing module synoptic diagram automatically.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Embodiment
As shown in Figure 1; Present embodiment comprises: contact sensor assembly 1, switch acquisition module 2 and contain the automatic detection processing module 3 of moving relay; Wherein: contact sensor assembly 1 links to each other with automatic detection processing module 3 and transmits the control loop status information; Switch acquisition module 2 receives outside the collection and opens into amount and be delivered to automatic detection processing module 3, detects processing module 3 automatically and receives to detect to start the GOOSE messages and gather from the outside of switch acquisition module 2 and open into amount and differentiate whether accord with expectation and differentiate the result to the outer monitoring system through MMS message service output logic of testing result;
Described automatic detection processing module 3 comprises: communications processor element 4, switch acquisition interface unit 5, relay control unit 6 and monitoring CPU 7, wherein: the outer monitoring system is differentiated, receives in the GOOSE message service of communications processor element 4 reception exterior I ED with the realization testing conditions MMS message service starts control relay and begins to monitor to realize detection startup command, the outside manual detection startup command of reception after monitoring CPU 7 is differentiated.
Described contact sensor assembly 1 comprises: automatic switch element 8 and safety assurance unit 9; Wherein: safety assurance unit 9 is concatenated in the electric primary equipment transformer operation control circuit; Automatic switch element 8 is unidirectional conducting diode, and conducting was also through non electrical quantity protection cable, pressing plate and the automatic processing module 3 formation monitoring closed loops that detect when positive and negative counter-rotating took place the current potential of this unidirectional conducting diode at two ends.
Described operation relay by relay J C1～JC5 with leave loop contact JX1～JX5 and form, totally five groups and be respectively:
The relay J C1 of the first operation relay links to each other with automatic detection processing module 3; It is left loop contact JX1 and is arranged at and longly opens state during normal operation: when satisfying the monitoring condition, it is left loop contact JX1 and drives in closure state: the public power of switch acquisition module 2 switches the back supplies with positive electricity through JX1.
The relay J C2 of the second operation relay links to each other with automatic detection processing module 3, and it is left loop contact JX2 and is arranged at closure state when normally moving: the public negative supply of switch acquisition module 2 is supplied with through JX2.It is left loop contact JX2 and drives in off-state during monitoring:
The relay J C3 of the 3rd operation relay links to each other with automatic detection processing module 3, and it is left loop contact JX3 and is arranged at closure state when normally moving: the public positive supply of non electrical quantity protection is supplied with through JX3.This moment, the contact place current potential of non electrical quantity protection was a forward, the 8 not conductings of automatic switch element, and it is 0 that switch acquisition module 2 is gathered input information S2-S4.And switch acquisition module 2 collection input information S1 are 1, play the effect of keeping watch on JX3, JX2.It is left loop contact JX3 and drives in off-state during monitoring: gathering input information S1 through switch acquisition module 2 is 0 for satisfying one of monitoring condition.
The relay J C4 of the 4th operation relay links to each other with automatic detection processing module 3; It is left loop contact JX4 and is arranged at and longly opens state during normal operation: when satisfying the monitoring condition, it is left loop contact JX4 and drives in closure state: the public power of non electrical quantity protection switches the back supplies with negative electricity through JX4.The contact place current potential of non electrical quantity protection this moment is reverse, 8 conductings of automatic switch element, and it is 1 that switch acquisition module 2 is gathered input information (if pressing plate all drops into) S2-S4.
The relay J C5 of the 5th operation relay links to each other with automatic detection processing module 3; It is left loop contact JX5 and is arranged at and longly opens state during normal operation: when satisfying the monitoring condition; Break JX3 at first; It is left loop contact JX5 and drives in closure state then: diode D2, the D3 current potential that be serially connected with in the trip(ping) circuit this moment are forward, and it is 1 that switch acquisition module 2 is gathered input information S2-S3.Be used to judge whether diode D2, D3 inside open a way.
Described switch acquisition module 2 adopts the on off state acquisition circuit that has the optocoupler sensor, and this on off state acquisition circuit is arranged in the non electrical quantity protective device and opening into mode collecting work status information and export automatic detection processing module 3 to through the optocoupler sensor.
The automatic detection that this case study on implementation relates to through the following steps realization:
1) precondition of the outlet loop of non electrical quantity protective device detection is differentiated: only when primary equipment is out of service, just carry out the subsequent step that non electrical quantity protective device outlet loop detects.Criterion is following:
Each side circuit breaker position of ■ transformer is for dividing position (significance bit);
Each side phase current of ■ transformer is lower than does not have the stream threshold;
Automatic detection processing module 3 in the non electrical quantity protective device is after the GOOSE message service that receives exterior I ED; After above-mentioned two conditions are satisfied in judgement simultaneously; Automatically detect processing module 3 and satisfy above-mentioned two conditions at the same time; The outlet loop detection entry condition of then differentiating for the non electrical quantity protective device satisfies, and drives corresponding operation relay tip closure.Forward step 2 to) continue to carry out;
Otherwise, differentiate testing conditions and do not satisfy, stop self check and directly return.
Whether 2) detect processing module 3 driving operation relays automatically and return, return through switch acquisition module 21, judge that the operation relay is left loop contact JC2, whether JC3 returns, returning the duration is 0.5s, forwards step 3) to and continues execution.
Otherwise, behind the 300ms that sets, differentiate testing conditions and do not satisfy, stop self check and directly return.
3) detect processing module 3 automatically and drive that the operation relays are left loop contact JC1, JC4 is closed, the automatic switch conducting of the contact sensor assembly 1 that connects in non electrical quantity protection place forms closed loops with switch acquisition module 2.Switch acquisition module 2 outputs to automatic detection processing module 3 with information.Forwarding step 4) to continues to carry out.
4) detecting in the processing module 3 automatically,, then forwarding step 5) to and continue to carry out if the sign array of the switch acquisition module 2 information circuits states of receiving protects the sign array among the Policy Table identical with the non electrical quantity that should drop into.Otherwise forwarding step 6) to continues to carry out.
5) outlet loop of decidable non electrical quantity protective device is no abnormal, and testing result is uploaded the station level network with the MMS message pattern, forwards step 7) then to and continues to carry out.
6) outlet loop of decidable non electrical quantity protective device is unusual, and testing result is uploaded the station level network with the MMS message pattern, stops monitoring simultaneously.
7) detect processing module 3 automatically and drive the operation relays and leave loop contact JC4 and return the JC5 closure, form closed loops with switch acquisition module 2.Switch acquisition module 2 outputs to automatic detection processing module 3 with information.Forwarding step 8) to continues to carry out.
8) automatically detecting in the processing module 3,, then forwarding step 9) to and continue execution if the sign array of the switch acquisition module 2 information circuits states of receiving is identical with sign array in the device detection table.Otherwise forwarding step 10) to continues to carry out.
9) decidable non electrical quantity protective device or the door loop no abnormal, testing result is uploaded the station level network with the MMS message pattern.
10) decidable non electrical quantity protective device or the door loop unusual, testing result is uploaded the station level network with the MMS message pattern.
So far, accomplish the Overall Steps of the outlet loop Intelligent Measurement of a non electrical quantity protective device.
This case study on implementation compared with prior art, the present invention adopts contact sensor assembly 1, utilizes information between monitored cable transmission contact sensor assembly 1 and the non electrical quantity protective device cleverly, having solved classic method need increase the order wire information problem that links to each other.And after primary equipment is out of service; Can be long-range or on the spot the outlet secondary circuit of traditional non electrical quantity protective device is advanced auto state and detect; Make outlet loop the pressing plate input out of order or abnormal conditions such as secondary circuit broken string can both be by timely discovery; Solve the dead band during the loop is detected in the prior art, effectively avoid and prevent the unusual not tripping problem that causes because of non electrical quantity protection outlet loop, the stable operation of promotion electrical network.
Claims (4)
1. outlet loop online detection system that is used for the non electrical quantity protective device; It is characterized in that; Comprise: contact sensor assembly, switch acquisition module and contain the automatic detection processing module of moving relay; Wherein: the contact sensor assembly links to each other with automatic detection processing module and transmits the control loop status information; The switch acquisition module receives outside the collection and opens into amount and be delivered to automatic detection processing module, detects processing module automatically and receives to detect to start the GOOSE message and gather from the outside of switch acquisition module and open into amount and differentiate whether accord with expectation and differentiate the result to the outer monitoring system through MMS message service output logic of testing result;
Described automatic detection processing module comprises: communications processor element, switch acquisition interface unit, relay control unit and monitoring CPU, and wherein: the outer monitoring system is differentiated, receives in the GOOSE message service of communications processor element reception exterior I ED with the realization testing conditions MMS message service starts control relay and begins to monitor to realize detection startup command, the outside manual detection startup command of reception after the monitoring CPU is differentiated;
Described contact sensor assembly comprises: automatic switch element and safety assurance unit; Wherein: the safety assurance unit strings is received in the electric primary equipment transformer operation control circuit; The automatic switch element is unidirectional conducting diode, and conducting was also through non electrical quantity protection cable, pressing plate and the automatic processing module formation monitoring closed loop that detects when positive and negative counter-rotating took place the current potential of this unidirectional conducting diode at two ends;
Described operation relay by relay with leave the loop contact and form, totally five groups and be respectively:
The relay of the first operation relay links to each other with automatic detection processing module, and it is left the loop contact and is arranged to grow and opens state when normally moving: when satisfying the monitoring condition, it is left the loop contact and drives in closure state;
The relay of the second operation relay links to each other with automatic detection processing module, and it is left the loop contact and is arranged at closure state when normally moving, and it is left the loop contact and drives in off-state during monitoring:
The relay of the 3rd operation relay links to each other with automatic detection processing module, and it is left the loop contact and is arranged at closure state when normally moving, and it is left the loop contact and drives in off-state during monitoring;
The relay of the 4th operation relay links to each other with automatic detection processing module, and it is left the loop contact and is arranged to grow and opens state when normally moving: when satisfying the monitoring condition, it is left the loop contact and drives in closure state;
The relay of the 5th operation relay links to each other with automatic detection processing module, and it is left the loop contact and is arranged to grow and opens state when normally moving: when satisfying the monitoring condition, and break at first, it is left the loop contact and drives in closure state then.
2. the outlet loop online detection system that is used for the non electrical quantity protective device according to claim 1; It is characterized in that; Described switch acquisition module adopts the on off state acquisition circuit that has the optocoupler sensor, and this on off state acquisition circuit is arranged in the non electrical quantity protective device and opening into mode collecting work status information and export automatic detection processing module to through the optocoupler sensor.
3. the detection method according to claim 1 or 2 said systems is characterized in that, may further comprise the steps:
The first step, detect processing module automatically and carry out the precondition that outlet loop detects and differentiate: only when the primary equipment transformer is out of service, just carry out the subsequent step of non electrical quantity protective device outlet loop detection;
Second step, detect processing module automatically and carry out the control power supply status that outlet loop detects next step and differentiate: only when the control power supply opening, just carry out the subsequent step of non electrical quantity protective device outlet loop detection;
The 3rd step, detect that processing module drive to detect the first and the 4th operation relay automatically leave the loop junction closure; Switch non electrical quantity protection working power polarity; The automatic switch conducting of the contact sensor assembly that install at non electrical quantity protection contact place also forms closed loop with the switch acquisition module, and the switch acquisition module outputs to automatic detection processing module with information;
The 4th goes on foot, detects automatically processing module judges that the sign array among the sign array of working as the loop state in the switch acquisition module information of receiving and the non electrical quantity that should the drop into protection Policy Table is identical; Then the N/R testing result of the outlet loop of non electrical quantity protective device is uploaded the station level network with the MMS message pattern and carried out for the 5th step, otherwise the testing result that the outlet loop of non electrical quantity protective device is unusual is uploaded station level network and detection of end with the MMS message pattern;
The 5th step, automatically detect processing module drive the 4th operation relay leave that the loop contact returns, the leaving the loop junction closure and form closed loop of the 5th operation relay with the switch acquisition module, the switch acquisition module outputs to automatic detection processing module with information;
The 6th step, automatically detect processing module judge when the sign array of the switch acquisition module information loop state of receiving identical with sign array in the device detection table, then with the non electrical quantity protective device or a N/R testing result in loop upload the station level network with the MMS message pattern; Otherwise with the non electrical quantity protective device or a door loop unusual testing result upload the station level network with the MMS message pattern, realize the outlet loop Intelligent Measurement;
Described precondition differentiation is meant:
1.1) communications processor element obtains the isolating switch cut-off signal according to the GOOSE message of exterior I ED;
1.2) the monitoring CPU judges: when receiving that each side isolating switch GOOSE position message signals of transformer is 10, then each side circuit breaker position of transformer is for dividing the position; Continue to judge each side low current actuating signal of transformer that when receiving that low current signal GOOSE position message signals is 1, then each side electric current of transformer is lower than does not have the stream threshold; The outlet loop detection entry condition of then differentiating for the non electrical quantity protective device satisfies, and execution in step 1.3);
1.3) the corresponding operation of relay control unit driving relay tip is closed and carried out for second step, otherwise stop detection.
4. detection method according to claim 3 is characterized in that, described control power supply status is differentiated concrete steps and comprised:
2.1) detect processing module automatically and drive the operation relay and return, carry out effect to returning correctness;
2.2) through switch acquisition module monitors state from 1 closed loop to 0, judge leaving the loop contact and whether returning of the second and the 3rd operation relay, forward the continuation execution of the 3rd step to; When then stopping self check above the testing conditions of unmet differentiation still behind the 300ms, judgement time directly returns.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101955317A CN102331757B (en) | 2011-07-13 | 2011-07-13 | Online detecting system and detecting method for outlet circuit of non-electric quantity protective device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101955317A CN102331757B (en) | 2011-07-13 | 2011-07-13 | Online detecting system and detecting method for outlet circuit of non-electric quantity protective device |
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| CN102331757B true CN102331757B (en) | 2012-11-07 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102749537A (en) * | 2012-06-14 | 2012-10-24 | 南京南瑞继保电气有限公司 | Method for testing performance of trip outlet contact of relay protection device |
| CN103208861B (en) * | 2013-04-19 | 2015-04-01 | 上海毅昊自动化有限公司 | Real-time online monitoring system of relay protection tripping and closing circuit |
| CN104569804B (en) * | 2015-01-29 | 2017-11-17 | 国家电网公司 | A kind of breaker operation cabinet self-adapting closed loop automatic detecting platform |
| CN104753042B (en) * | 2015-03-20 | 2017-07-18 | 中国南方电网有限责任公司 | It is a kind of to realize the method for not having a power failure and examining route protection by outputing in short-term |
| CN110426625A (en) * | 2019-08-02 | 2019-11-08 | 刘韶俊 | A kind of computer operation case for substation |
| CN111999600B (en) * | 2020-08-25 | 2023-03-21 | 武汉中元华电电力设备有限公司 | Intelligent distribution network terminal secondary current loop fault diagnosis positioning method and system |
| CN113848472A (en) * | 2021-10-21 | 2021-12-28 | 广东电网有限责任公司 | State monitoring device |
| CN115032491B (en) * | 2022-08-12 | 2022-11-01 | 国网山东省电力公司电力科学研究院 | Non-electric quantity protection test method for transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6469629B1 (en) * | 1999-02-12 | 2002-10-22 | General Electric Company | Distributed logic in multiple protective relays |
| CN101764432B (en) * | 2010-01-14 | 2012-05-23 | 上海思源弘瑞自动化有限公司 | Intelligent operation box with action connection point self-checking function |
| CN101867228B (en) * | 2010-07-22 | 2012-05-09 | 上海思源弘瑞自动化有限公司 | Outlet loop online detection system for relay protection device |
| CN101944771B (en) * | 2010-08-13 | 2012-07-25 | 上海思源弘瑞自动化有限公司 | Secondary loop panoramic state monitoring system for electric operating mechanism of circuit breaker |
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