CN108983078A - A kind of relay build-out resistor selection device and method - Google Patents

A kind of relay build-out resistor selection device and method Download PDF

Info

Publication number
CN108983078A
CN108983078A CN201710401067.XA CN201710401067A CN108983078A CN 108983078 A CN108983078 A CN 108983078A CN 201710401067 A CN201710401067 A CN 201710401067A CN 108983078 A CN108983078 A CN 108983078A
Authority
CN
China
Prior art keywords
relay
build
measured
out resistor
gear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710401067.XA
Other languages
Chinese (zh)
Other versions
CN108983078B (en
Inventor
郭震
黄旭
王振华
葛维春
王全海
于同伟
贺渊明
李籽良
宋丁
宋一丁
卢岩
周俊华
郑志勤
周东杰
邵宝珠
任华锋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Xuji Group Co Ltd
XJ Electric Co Ltd
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Xuchang XJ Software Technology Co Ltd
Original Assignee
State Grid Corp of China SGCC
Xuji Group Co Ltd
XJ Electric Co Ltd
Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd
Xuchang XJ Software Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Xuji Group Co Ltd, XJ Electric Co Ltd, Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd, Xuchang XJ Software Technology Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201710401067.XA priority Critical patent/CN108983078B/en
Publication of CN108983078A publication Critical patent/CN108983078A/en
Application granted granted Critical
Publication of CN108983078B publication Critical patent/CN108983078B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327Testing of circuit interrupters, switches or circuit-breakers

Abstract

The present invention provides a kind of relay build-out resistor selection device and method, the operation voltage range of relay to be measured is divided into m gear, m is the positive integer greater than 1;According to the corresponding actuating of relay voltage range to be measured of each gear, calculates each shelves and select corresponding build-out resistor;One of gear is selected, the coiler part of its corresponding build-out resistor and test power supply, relay to be measured is connected into test loop, whether the contact part for detecting relay to be measured acts;If the contact part of relay to be measured acts, build-out resistor corresponding to the gear is build-out resistor needed for relay to be measured;Otherwise it switches to remaining any gear to be judged again, until build-out resistor needed for determining relay to be measured.It is that required build-out resistor can be directly selected out according to the electric potential signal of relay contact part, so can be improved the efficiency of relay build-out resistor selection due to technical solution provided by the present invention.

Description

A kind of relay build-out resistor selection device and method
Technical field
The invention belongs to relay test technical fields, and in particular to a kind of relay build-out resistor selection device and side Method.
Background technique
As most basic executive component, relay plays a crucial role in relay protection device.Relay is protected Relay in shield equipment is typically all small-sized electromagnetic type relay, and this relay is cored, coil, armature and contact bullet The composition such as spring after applying certain voltage at the both ends of coil, just has electric current in coil, electric current generates electromagnetism effect in coil It answers, generates magnetic force, contact-actuating is opened or closed.Since the contact part and coiler part of relay are separately positioned, and And, so vulnerabilities scan forceful electric power can be used, safety when operating to forceful electric power can be increased by the movement of coil control contacts Property.
The relay of relay protection device is generally all disposed in control box, is provided by DC power supply panel in control box 220V/100V DC voltage is applied to the both ends of relay coil, when the voltage at relay coil both ends reaches after partial pressure When its operation voltage value, the contact of relay will be acted.In actual circuit relay setting mode as shown in Figure 1, Coiler part series matching resistor R1 and R2, to control the voltage at relay coil part both ends.
Many relays are equipped in control box, the operation voltage of each relay is different from, even if nominal fixed The relay of operation voltage value, actual operation voltage value may also be different, such as nominal operation voltage value is the relay of 24V Device, actual operation voltage value may be in 10V or so.Although some companies require, relay is dynamic in relay protection device Make voltage value should between the 55%-70% of its rated operational voltage, i.e., relay coil part both ends voltage be less than after Electric appliance rated operational voltage 55% when the akinesia of relay contact part, but work as relay coil part both ends voltage Greater than relay rated operational voltage 70% when, the contact part of relay must act.Therefore, before relay is installed It needs to test relay, to determine the resistance value of build-out resistor R1 and R2.
Currently, the method for determining build-out resistor R1 and R2 resistance value, mainly first detects the operation voltage of relay, then root The resistance value of build-out resistor R1 and R2 is calculated according to the operation voltage of relay.Although this method can select matching far more than Resistance R1 and R2, but when carrying out voltage detecting to relay needs regulating relay coiler part repeatedly voltage, and It detects also to need to calculate just the resistance value that can access build-out resistor when the operation voltage of relay, institute is number in this way Tired, efficiency is relatively low.
Summary of the invention
The purpose of the present invention is to provide a kind of relay build-out resistor selection device and methods, for improving to relay Choose efficiency when build-out resistor.
A kind of relay build-out resistor selection device, including processor, contact part of detecting and coil measurement part;
The contact part of detecting is used to connect the contact part of relay to be measured, detects the movement of relay contact part Signal is simultaneously transferred to processor;
The coil measurement part includes test power supply and build-out resistor selecting module;Build-out resistor selecting module includes m The test branch of item parallel connection, every test branch road string are equipped with corresponding build-out resistor, and each build-out resistor is by relay to be measured Operation voltage range is divided into m grades, and determined by the operation voltage range of each gear;Each test branch and the test power supply are used It is connected in the coiler part of relay to be measured, to form corresponding test loop;The m is the positive integer greater than 1;
The processor is determined for successively gating each test loop, and according to relay contact partial act signal to be measured Build-out resistor needed for relay to be measured.
Further, respectively the corresponding build-out resistor of test branch routing is connected in series with open pipe, the processor control System connects the control terminal of each switching tube.
Further, further include selection switch, select wherein one end connecting test power supply of switch, the other end is for connecting Wherein one end of the coiler part of at least one relay to be measured, build-out resistor selecting module is for connecting each relay line to be measured Enclose the other end of part.
Further, the contact part of detecting includes DC power supply, DC power supply by pull-up resistor connect it is to be measured after It is grounded after the contact part of electric appliance, the processor is used to detect the electric potential signal of relay contact part.
A kind of relay build-out resistor selection method, includes the following steps:
(1) the operation voltage range of relay to be measured is divided into m gear, m is the positive integer greater than 1;
(2) according to the corresponding actuating of relay voltage range to be measured of each gear, each shelves is calculated and select corresponding build-out resistor;
(3) one of gear is selected, by the coiler part of its corresponding build-out resistor and test power supply, relay to be measured It is connected into test loop, whether the contact part for detecting relay to be measured acts;If the contact part of relay to be measured acts, Then build-out resistor corresponding to the gear is build-out resistor needed for relay to be measured;Otherwise, switch remaining any gear again It is secondary to be judged, until build-out resistor needed for determining relay to be measured.
Further, according to the corresponding actuating of relay voltage range to be measured of each gear, ascending sequence is successively selected Select gear.
The beneficial effects of the present invention are: technical solution provided by the present invention, by the operation voltage range of relay to be measured It is divided into m gear, and the operation voltage range according to corresponding to each gear determines corresponding build-out resistor, it then will test electricity Source, relay to be measured coiler part and one of gear corresponding to build-out resistor be connected into test loop, last basis The electric potential signal of relay contact part to be measured, build-out resistor needed for relay to be measured can be directly determined.The present invention is mentioned The technical solution of confession is not needed to adjust the voltage for being applied to relay both ends to be measured repeatedly, not needed according to relay to be measured yet Operation voltage calculate build-out resistor resistance value, reduce selection build-out resistor when workload, improve relay to be measured Efficiency with resistance selection.
Detailed description of the invention
Fig. 1 is the operation circuit of relay and resistance cooperation in protective relaying device;
Fig. 2 is the schematic diagram of relay build-out resistor selection device in embodiment.
Specific embodiment
The purpose of the present invention is to provide a kind of relay build-out resistor selection device and methods, for improving to relay Choose efficiency when build-out resistor.
A kind of relay build-out resistor selection method provided by the present invention, includes the following steps:
(1) the operation voltage range of relay to be measured is divided into m gear, m is the positive integer greater than 1;
(2) according to the corresponding actuating of relay voltage range to be measured of each gear, each shelves is calculated and select corresponding build-out resistor;
(3) one of gear is selected, by the coiler part of its corresponding build-out resistor and test power supply, relay to be measured It is connected into test loop, whether the contact part for detecting relay to be measured acts;If the contact part of relay to be measured acts, Then build-out resistor corresponding to the gear is build-out resistor needed for relay to be measured;Otherwise, switch remaining any gear again It is secondary to be judged, until build-out resistor needed for determining relay to be measured.
Embodiments of the present invention are described further with reference to the accompanying drawing.
Embodiment of the method:
The present embodiment provides a kind of relay build-out resistor selection methods, for selecting build-out resistor for relay.For Different relays, operation voltage may be different, and the resistance value of required build-out resistor is also different, thus will to relay to be measured into Row stepping.If the permitted minimum value of the operation voltage of relay is UJL, maximum value UJH, then by the dynamic of relay to be measured It is divided into m gear as voltage range, m is the integer greater than 1:
The operation voltage range of 1st grade of relay: UJL~UJL* (1+10%);
The operation voltage range of 2nd grade of relay: UJL* (1+10%)~UJL* (1+20%);
And so on, the operation voltage range of m grades of relays: UJL* (1+ (m-1) * 10%)~UJH
After the operation voltage stepping of relay to be measured, corresponding build-out resistor is selected for each shelves.Assuming that protective device Voltage rating is Ue, the operation voltage of relay to be measured belongs to S grades, and the minimum action voltage of this grade is USL, maximum actuation voltage For USH, the resistance value of required build-out resistor is R, if the resistance value of relay coil is Rj, then according to Ohm's law, shelves matching The resistance value R of resistance should meet following relationship:
Then build-out resistor corresponding to the 1st grade connect with the coiler part of test power supply, relay to be measured, form survey Circuit is tried, whether the contact part for detecting relay to be measured acts.If the contact part of relay to be measured acts, it is to be measured after The action power of electric appliance belong to the 1st grade, the 1st grade corresponding to build-out resistor be build-out resistor that relay to be measured needs;Such as The part of fruit relay contact to be measured is failure to actuate, then by build-out resistor be changed to the 2nd grade corresponding to build-out resistor.And so on, If the contact part of relay to be measured is failure to actuate when in the access test loop of build-out resistor corresponding to i-th grade, but i+1 The contact part movement of relay to be measured, is judged as this grade corresponding when in build-out resistor access test loop corresponding to shelves It is build-out resistor needed for relay to be measured with resistance.Above-mentioned i is the integer for being less than m greater than 1.
As other embodiments, the 0th grade of actuating of relay voltage to be measured can be set, corresponding to this grade it is to be measured after Electric appliance operation voltage is less than UJLIf detecting that the operation voltage of relay to be measured belongs to the 0th grade, it is judged as the relay to be measured The operation voltage of device is too small.
As other embodiments, if when test loop access m grades corresponding to build-out resistor when, the touching of relay Point does not act still, then is judged as that the operation voltage of the relay to be measured is excessive.
Installation practice:
The present embodiment provides a kind of relay build-out resistor selection devices, for selecting build-out resistor for relay.This reality Relay build-out resistor selection device provided by example is applied, as relay matching provided in realization above method embodiment The device of resistance selection method, as shown in Fig. 2, including processor MCU, contact part of detecting and coil measurement part.
Contact part of detecting includes DC power supply VCC, and DC power supply VCC connects the touching of relay to be measured by pull-up resistor Point is grounded behind part, such as passes through pull-up resistor Rk1The contact part J1B for connecting relay J1 to be measured, passes through pull-up resistor Rk2Even The contact part J2B etc. of relay J2 is surveyed in reception.Processor each pull-up resistor of MCU connection is connected with corresponding relay contact to be measured The current potential at position judges whether the contact part of corresponding relay to be measured acts according to the current potential.
Coil measurement part includes test power supply, and it is each to be measured to triode Qn connection that test power supply passes through triode Q1 respectively The coiler part JnA of the coiler part J1A to relay Jn of relay J1.In the present embodiment triode Q1 to triode Qn conduct Controllable switch uses, the collector connecting test power supply of each triode, the coiler part of the corresponding relay to be measured of emitter connection, Processor MCU control connects the base stage of each triode, controls the triggering of each triode, relay to be measured is selected to be tested.Line Circle part of detecting further includes build-out resistor selecting module, which is formed by m item test branch circuit parallel connection, it is each test branch with it is above-mentioned Actuating of relay voltage gear to be measured it is corresponding, i-th test branch route i-th grade corresponding to build-out resistor and three poles Pipe Q 'iIt is connected in series, triode Q 'iCollector connect the coiler part of each relay to be measured, emitter connects of corresponding shelves With resistance.Processor MCU connects the base stage of triode in each test branch, by controlling the triggering of triode, selection matching electricity Resistance and relay coil sections in series to be measured.
When measuring to relay to be measured, processor MCU chooses relay to be measured into Qn from triode Q1 first Device such as selects relay J1 to be measured by trigger triode Q1, selects relay J2 to be measured etc. by trigger triode Q2.It is elected After having selected relay to be measured, processor MCU successively controls triode Q ' again1To Q 'mTriggering, selects matching corresponding to corresponding shelves Resistance, such as trigger triode Q1, test power supply, the coil of selected relay to be measured and the 1st grade of build-out resistor form string Connection forms test loop, and whether the contact part current potential that processor MCU detects selected relay to be measured at this time changes.If It converts, then the contact part generation movement of selected relay to be measured, judges that the operation voltage of selected relay to be measured belongs to 1st grade, build-out resistor is build-out resistor corresponding to the 1st grade;If the current potential of selected relay contact part to be measured does not have It changes, then the contact of selected relay to be measured does not act, and closes triode Q ' at this time1, trigger triode Q '2, processor MCU detects the current potential of selected relay contact part to be measured again, and so on, if the contact of selected relay to be measured is being triggered Triode Q 'iWhen do not act, trigger triode Q 'i+1When act, then be judged as that the operation voltage of selected relay to be measured belongs to I+1 shelves, build-out resistor are build-out resistor corresponding to i+1 shelves.
In the present embodiment, for build-out resistor needed for more accurately obtaining each relay to be measured, corresponding to each gear Build-out resistor be set as identical as the actual condition of relay to be measured, connected using two resistance, as corresponding to first grade Build-out resistor is Ra1And Ra2, the corresponding build-out resistor of second gear is Rb1And Rb2Deng.

Claims (6)

1. a kind of relay build-out resistor selection device, which is characterized in that including processor, contact part of detecting and coil measurement Part;
The contact part of detecting is used to connect the contact part of relay to be measured, detects the action signal of relay contact part And it is transferred to processor;
The coil measurement part includes test power supply and build-out resistor selecting module;Build-out resistor selecting module include m item simultaneously The test branch of connection, every test branch road string are equipped with corresponding build-out resistor, and each build-out resistor is by the actuating of relay to be measured Voltage range is divided into m grades, and determined by the operation voltage range of each gear;Each test branch and the test power supply for and The coiler part of relay to be measured connects, to form corresponding test loop;The m is the positive integer greater than 1;
The processor is determined according to relay contact partial act signal to be measured to be measured for successively gating each test loop Build-out resistor needed for relay.
2. a kind of relay build-out resistor selection device according to claim 1, which is characterized in that each test branch routing with Corresponding build-out resistor be connected in series with open pipe, processor control connects the control terminal of each switching tube.
3. a kind of relay build-out resistor selection device according to claim 1, which is characterized in that further include that selection is opened It closes, selects wherein one end connecting test power supply of switch, the other end is used to connect the coiler part of at least one relay to be measured Wherein one end, build-out resistor selecting module is used to connect the other end of each relay coil part to be measured.
4. a kind of relay build-out resistor selection device according to claim 1, which is characterized in that the contact test department It point include DC power supply, DC power supply is grounded after connecting the contact part of relay to be measured by pull-up resistor, the processor For detecting the electric potential signal of relay contact part.
5. a kind of relay build-out resistor selection method, which comprises the steps of:
(1) the operation voltage range of relay to be measured is divided into m gear, m is the positive integer greater than 1;
(2) according to the corresponding actuating of relay voltage range to be measured of each gear, each shelves is calculated and select corresponding build-out resistor;
(3) one of gear is selected, its corresponding build-out resistor is connected with the coiler part of test power supply, relay to be measured At test loop, whether the contact part for detecting relay to be measured is acted;It, should if the contact part of relay to be measured acts Build-out resistor corresponding to gear is build-out resistor needed for relay to be measured;Otherwise switch to remaining any gear again into Row judgement, until build-out resistor needed for determining relay to be measured.
6. a kind of relay build-out resistor selection method according to claim 5, which is characterized in that corresponding according to each gear Actuating of relay voltage range to be measured, ascending sequence successively selects gear.
CN201710401067.XA 2017-05-31 2017-05-31 Relay matching resistance selection device and method Active CN108983078B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710401067.XA CN108983078B (en) 2017-05-31 2017-05-31 Relay matching resistance selection device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710401067.XA CN108983078B (en) 2017-05-31 2017-05-31 Relay matching resistance selection device and method

Publications (2)

Publication Number Publication Date
CN108983078A true CN108983078A (en) 2018-12-11
CN108983078B CN108983078B (en) 2020-11-17

Family

ID=64501408

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710401067.XA Active CN108983078B (en) 2017-05-31 2017-05-31 Relay matching resistance selection device and method

Country Status (1)

Country Link
CN (1) CN108983078B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111077470A (en) * 2019-12-26 2020-04-28 北汽福田汽车股份有限公司 Power supply gear function testing system and method
CN112379615A (en) * 2020-10-27 2021-02-19 许继集团有限公司 Circuit and method for detecting chip fault of bus transceiver of open-loop circuit

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399134A (en) * 2008-10-28 2009-04-01 深圳市科陆电子科技股份有限公司 Relay status detection method
CN104360265A (en) * 2014-11-06 2015-02-18 贵州天义电器有限责任公司 Multi-switching relay tester
CN204666788U (en) * 2015-05-15 2015-09-23 国家电网公司 A kind of relay checking seat
CN204719203U (en) * 2015-06-18 2015-10-21 苏州工业职业技术学院 SCM Based electromagnetic relay characterisitic parameter measuring instrument
CN105182134A (en) * 2015-09-16 2015-12-23 国网福建省电力有限公司 Verification device for operation logic and switching tripping and closing time-delay fixed value of spare power automatic switching device
JP2016133405A (en) * 2015-01-20 2016-07-25 富士通テン株式会社 Monitoring apparatus and battery monitoring system
CN205582837U (en) * 2016-04-28 2016-09-14 铜仁市万山区顺宇电气有限公司 Relay structure from series connection divider resistance
CN106033110A (en) * 2015-03-16 2016-10-19 浙江正泰电器股份有限公司 Relay contact resistance measurement device
CN106168650A (en) * 2016-08-30 2016-11-30 中山市开普电器有限公司 A kind of specified residue connects breaking capacity test device
CN206020619U (en) * 2016-08-31 2017-03-15 西安开天铁路电气股份有限公司 A kind of portable relay tester

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399134A (en) * 2008-10-28 2009-04-01 深圳市科陆电子科技股份有限公司 Relay status detection method
CN104360265A (en) * 2014-11-06 2015-02-18 贵州天义电器有限责任公司 Multi-switching relay tester
JP2016133405A (en) * 2015-01-20 2016-07-25 富士通テン株式会社 Monitoring apparatus and battery monitoring system
CN106033110A (en) * 2015-03-16 2016-10-19 浙江正泰电器股份有限公司 Relay contact resistance measurement device
CN204666788U (en) * 2015-05-15 2015-09-23 国家电网公司 A kind of relay checking seat
CN204719203U (en) * 2015-06-18 2015-10-21 苏州工业职业技术学院 SCM Based electromagnetic relay characterisitic parameter measuring instrument
CN105182134A (en) * 2015-09-16 2015-12-23 国网福建省电力有限公司 Verification device for operation logic and switching tripping and closing time-delay fixed value of spare power automatic switching device
CN205582837U (en) * 2016-04-28 2016-09-14 铜仁市万山区顺宇电气有限公司 Relay structure from series connection divider resistance
CN106168650A (en) * 2016-08-30 2016-11-30 中山市开普电器有限公司 A kind of specified residue connects breaking capacity test device
CN206020619U (en) * 2016-08-31 2017-03-15 西安开天铁路电气股份有限公司 A kind of portable relay tester

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ALBERTO MAISTRELLOA: "Analyses of the impact of connections’ layout on the coil transientvoltage at the Quench Protection Circuit intervention in JT-60SA", 《FUSION ENGINEERING AND DESIGN》 *
李丽双: "基于PXI总线平台的继电器控制盒综合测试系统设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111077470A (en) * 2019-12-26 2020-04-28 北汽福田汽车股份有限公司 Power supply gear function testing system and method
CN111077470B (en) * 2019-12-26 2021-06-18 北汽福田汽车股份有限公司 Power supply gear function testing system and method
CN112379615A (en) * 2020-10-27 2021-02-19 许继集团有限公司 Circuit and method for detecting chip fault of bus transceiver of open-loop circuit

Also Published As

Publication number Publication date
CN108983078B (en) 2020-11-17

Similar Documents

Publication Publication Date Title
CN108983078A (en) A kind of relay build-out resistor selection device and method
CN104090234B (en) The test circuit of arc-fault circuit interrupter and method
CN109449059A (en) Intelligent breaker with self-checking function
AU2006243066A1 (en) Circuit protection device and test facility to simulate a fault condition
CN202127233U (en) Power grid fault measuring and controlling device
Rusek et al. Timings of high voltage circuit-breaker
Kizilcay et al. Interaction of the secondary arc with the transmission system during single-phase autoreclosure
US11329479B2 (en) Locating and isolating grid faults utilizing a fast close-open operation
CN104280663A (en) Online monitoring and line selecting method for single-phase earth faults of small current grounding system
Gamit et al. Fault analysis on three phase system by auto reclosing mechanism
CN103762557B (en) The anti-open-circuit-protection method of current transformer
RU166909U1 (en) ADAPTIVE REMOTE PROTECTION OF THE ELECTRIC TRANSMISSION LINE
CN103823153A (en) 35kV distribution network single-phase earth fault type judging device
CN105334368B (en) A kind of electrical self-checking circuit of Anesthesia machine solenoid valve
CN209311616U (en) A kind of simple type current protection detection illustrative circuitry
Micu et al. Possibilities of Monitoring, Commands and Control of the Circuit Breakers
CN109921404A (en) A kind of full compensation device of controllable current source earth current and method
CN206772579U (en) A kind of autoreclose breaker batch mechanical endurance test cabinet
CN104143812A (en) Electric leakage detection protection circuit
CN102435879B (en) Method for detecting line before switch on
CN101911418B (en) Module mechanically linkable to a circuit breaker
CN204731313U (en) A kind of electronic type synchronizing checking relay
Zeineldin et al. High voltage circuit breaker modeling for online model-based monitoring and diagnosis
CN102879669A (en) Failure current simulation device and working method thereof
CN109387751A (en) A kind of line fault monitoring device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant