CN201789272U - Relay protection circuit preventing transformer differential protection malfunction - Google Patents

Relay protection circuit preventing transformer differential protection malfunction Download PDF

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Publication number
CN201789272U
CN201789272U CN201020176169XU CN201020176169U CN201789272U CN 201789272 U CN201789272 U CN 201789272U CN 201020176169X U CN201020176169X U CN 201020176169XU CN 201020176169 U CN201020176169 U CN 201020176169U CN 201789272 U CN201789272 U CN 201789272U
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China
Prior art keywords
pressure
differential protection
transformer
contact
input
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Expired - Lifetime
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CN201020176169XU
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Chinese (zh)
Inventor
吴宏斌
应高亮
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Jinhua Electric Power Bureau
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Jinhua Electric Power Bureau
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Publication of CN201789272U publication Critical patent/CN201789272U/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

The utility model relates to a relay protection circuit, in particular to a relay protection circuit preventing transformer differential protection malfunction, which aims at providing a relay protection device preventing transformer differential protection malfunction. The relay protection device automatically locks a secondary current loop by the aid of the running state of a primary device, and is simultaneously assisted by external connection to eliminate blind zone failure. The technical scheme of the relay protection circuit preventing transformer differential protection malfunction includes that 1 the relay protection circuit comprises a main transformer differential protection device 1, and 2 connection points of all circuit breakers on all sides of a transformer with a tripping position in an isolating switch are arranged in corresponding switching value input loops in the differential protection device, the differential protection device adopts input values of a terminal of the differential protection device as locking values of corresponding sides, and when the input values of the differential protection device indicate potential input, the differential protection device locks current of the corresponding side by the aid of internal program.

Description

Prevent the relay protection circuit of transformer differential protection malfunction
Technical field
The utility model relates to a kind of relay protection circuit, specifically is meant the relay protection circuit that prevents the transformer differential protection malfunction.
Background technology
According to " relaying protection and automatic safety device technical regulation " (DL400-91) requirement, the power equipment in the electric power system must be installed and satisfy system safety and device security, can excise the main protection of protected equipment with prestissimo selectively.And power transformer occupies extremely important status as a kind of crucial main equipment in electric power system.The power transformer reliability of operation is the important assurance of whole power system security; Therefore, the correct action message of transformer relay protecting has extreme importance.When transformer broke down, its protective device tripping or can not quick acting in wanting seeking time may cause transformer damage in various degree, even burn; When the action that makes a mistake of transformer protective relaying device when not breaking down, can cause unnecessary loss of outage again.
The principle of existing transformer differential protection is a Kirchhoff's first law, and transformer normally moves or during external fault, the electric current of inflow transformer equals to flow out the electric current of transformer, and differential protection is failure to actuate; When power transformer interior fault, then only flow to the electric current of transformer and do not flow out the electric current of transformer, the differential protection action disconnects each side loop, the isolated fault point.Operating principle and external cabling according to differential protection can know clearly that the protection range of differential protection is that differential secondary current connects all devices between the instrument transformer, and Fig. 1 is seen in concrete protection configuration.
For guaranteeing the reliability and the continuity of power supply, when the main transformer high voltage side current mulual inductor malfunction of internal bridge maybe needed to change, the mode that generally adopts bridge switch to move reduced main transformer and stops the labour time.According to " relaying protection and power grid security automatics check regulations " requirement; the scope of examination in current transformer loop comprises the test winding polarity, from (the seeing shown in Figure 2) such as exciting characteristic curves of the no-load voltage ratio of the big galvanoscopy work tap of once feeding of current transformer and mapping secondary winding.If in construction, cause not having effectively to isolate the current circuit of main transformer protection owing to the testing crew carelessness; in the subsequent through-flow test, will in differential protection, artificial generation difference flow; cause the protection misoperation; disconnect operating transformer; and the reserve protection is owing to there being the composite voltage blocking function, so malfunction can not take place.
After each side electric equipment of transformer (comprise circuit breaker, isolate plug-in strip, current transformer etc.) is changed end,, will arrange to implement corresponding shock test by the dispatcher for assurance equipment normally puts into operation.#1 main transformer high-pressure side circuit breaker with the 110kV substation with internal bridge is replaced by example, its operational mode is the circuit breaker operation of #1 main transformer high-pressure side, the operation of circuit plug-in strip, the bus plug-in strip disconnects, high-pressure side mother stock fuser belt #1 main transformer load impacts the main transformer circuit-breaker testing by circuit offside switch to this transformer station.If the circuit breaker accident that is short-circuited in the impact process; not only offside circuit breaker meeting tripping; and because the fault point is positioned at #1 main transformer differential protection range; to cause the differential protection action; tripping high-pressure side mother stock and low-pressure side circuit breaker; cause the #1 main transformer out of service under normal condition, as shown in Figure 3.In the actual schedule running; for preventing the generation of this type of situation; take to withdraw from the equipment impact process mode of differential protection; though this measure can be avoided the possibility of differential protection malfunction; but also can reduce fail safe and system's operational reliability of main transformer equipment simultaneously, require to have a tremendous difference with the power grid security rules.
Can know that from the formation of main transformer differential protection and the situation of malfunction generation flowing into the required electric current of improper protection in the current transformer that differential protection connects is the main cause that causes malfunction.The existing method that solves above-mentioned fault mainly contains: 1, implement on-the-spot interim quarantine measures; promptly before current transformer is carried out through-flow test or before the electric equipment in the differential protection institute Current Transformer scope impacts; arrange the professional to the on-the-spot corresponding secondary current loop that disconnects; safety for assurance personnel and equipment; also need utilize special-purpose shorting stub on the protection terminal board, to finish short circuit, as shown in Figure 4.The subject matter of implementing interim quarantine measures at the scene is to need the special maintainer of arrangement to isolate and short circuit work on different transformer stations, different differential protection current circuit according to the requirement of operational mode; the Personnel Skill Levels is required height; workload and dangerous big; careless omission and " three mistakes " accident take place easily; simultaneously because far away; the undermanned inefficiency that causes seriously restricts the normal consistency of electrical network.2, the operations staff utilizes the method that the short circuit terminal is isolated, that is: the method for utilizing current circuit short circuit terminal to isolate by the substation operation personnel can effectively reduce the operating time, improve operating efficiency, do not need to arrange specially the maintainer to join a regular shift or class and carry out short circuit work.But the prerequisite that this method is carried out is each side current circuit of main transformer differential protection all need install the big electric current short circuit terminal of being convenient to operations staff's operation.According to present actual conditions, most of differential protection is not installed this type of terminal; According to the operating standard requirement, the operations staff must not carry out this operation when equipment is not in maintenance simultaneously, therefore causes this method not implement effectively.
Above-mentioned two solution fault methods all propose high requirement to operational mode, peopleware, equipment disposition, and along with increasing of equipment in the electrical network, the workload of this type of situation will inevitably roll up; Therefore now the utmost point needs that a kind of have can be according to power system operating mode, the protective relaying device differentiated automatically, thereby fundamentally addresses the above problem.
The utility model content
The utility model is at the transformer that has the problems referred to above; a kind of protective relaying device that prevents the transformer differential protection malfunction is provided; this protective relaying device is to come automatic blocking secondary current loop by the running status of primary equipment, is aided with external cabling simultaneously and comes the dead zone-eliminating fault.
The utility model is implemented by the following technical programs: a kind of relay protection circuit that prevents the transformer differential protection malfunction comprises:
1) the main transformer differential protective device 1, and its analog quantity input inserts the secondary current of high-pressure side line current instrument transformer, high-pressure side mother stock current transformer and main transformer 1 low-pressure side current transformer respectively;
2) the main transformer differential protective device 1, its switching value input inserts main transformer 1 high-pressure side line-breaker, bus isolating switch, line disconnecting switch position contact respectively, high-pressure side mother stock switch, I section bus isolating switch, II section bus isolating switch position contact, main transformer 1 low-pressure side circuit breaker, bus plug-in strip, main transformer plug-in strip separating brake position contact;
Separating brake position contact in each side circuit breaker of described transformer and the isolating switch is arranged in the respective switch amount input circuit in the differential protection; input variable with its terminal in this differential protection is a respective side locking amount; after the amount of opening in the differential protective device shows the current potential input, by the magnitude of current of internal processes locking respective side.
High-pressure side circuit breaker in the above-mentioned differential protection divides position contact, high-voltage side bus isolating switch to divide a contact and high-pressure side line disconnecting switch to divide contact back in parallel in the high side switch terminal box in position to move back in the pressing plate input differential protection by position, high-pressure side optocoupler input throwing.
Comprise in the high-pressure subsection side switch terminal case in the above-mentioned differential protection that high-pressure subsection side circuit breaker divides position contact, high-pressure subsection side bus isolating switch to divide position contact and high-pressure subsection side line road isolating switch to divide the position contact; High-pressure subsection side circuit breaker in the differential protection divides position contact, high-pressure subsection I section bus isolating switch to divide a contact and high-pressure subsection II section bus isolating switch to divide contact back in parallel in the block switch terminal box of high-pressure side in position to move back in the pressing plate input differential protection by segmentation position, high-pressure side optocoupler input throwing.
Low-pressure side circuit breaker in the above-mentioned differential protection divides position contact, low-pressure side bus isolating switch to divide a contact and low-pressure side line disconnecting switch to divide contact back in parallel in the low-side switch terminal box in position to move back in the pressing plate input differential protection by low-pressure side position optocoupler input throwing.
During use of the present utility model, after having changed main transformer differential protection logic and corresponding wiring, at first check each side circuit breaker in the differential protection, isolate the plug-in strip position and whether correctly open into amount; Secondly guaranteeing to feed test current on the correct connection basis of each side current circuit of differential protection; check that by the closure of simulating outside each contact the sampled value of corresponding electric current in the differential protection and difference stream show; correct situation should be that the respective side current sampling data is zero, occurs onesize poor flow valuve simultaneously.
Main transformer differential protection logic is as follows: the logical circuit with switching value latching current function is set, and its logic is: when any isolating switch of high-pressure side circuit breaker or high-pressure side disconnects Blocking Differential Protection high voltage side current loop; When high-pressure subsection side circuit breaker or any isolating switch disconnection of high-pressure subsection side, Blocking Differential Protection high-pressure subsection side current circuit; When low-pressure side circuit breaker or any isolating switch disconnection of low-pressure side, Blocking Differential Protection low-pressure side current circuit; Its logical circuit as shown in Figure 5.
The beneficial effects of the utility model are: the protective relaying device that the utility model provides is in conjunction with each side circuit breaker of transformer, isolation plug-in strip position and change the unification that corresponding differential protection programmed logic can effectively keep first and second equipment, effectively avoids the generation of main transformer differential protection maloperation situation.
Description of drawings
Fig. 1 is the transformer differential protection configuration schematic diagram.
Fig. 2 is transformer main transformer 1 a high voltage side current instrument transformer repairing drawing.
Fig. 3 is transformer main transformer 1 a high-pressure side circuit breaker failure schematic diagram.
Fig. 4 is that professional maintainer disconnects secondary current loop schematic diagram.
Fig. 5 is that the transformer difference flows back to road latching logic figure.
Fig. 6 is transformer high-voltage side apparatus position input wires figure.
Embodiment
Below, the technical solution of the utility model is described further by embodiment.
Embodiment 1: on the south the high-pressure side part of 110kV transformer RCS-9671 type differential protection of the auspicious guarantor of continuing company be example.Shown in Fig. 1-4, the protective relaying device that this prevents the transformer differential protection malfunction comprises:
1) the main transformer differential protective device 1, and its input inserts the secondary current of high-tension line current transformer, high pressure mother stock current transformer and main transformer 1 low-pressure side current transformer respectively;
2) the main transformer differential protective device 1, its output inserts main transformer 1 high-pressure side line-breaker, bus isolating switch, line disconnecting switch separating brake position contact respectively, high-pressure side mother stock switch, I section bus isolating switch, II section bus isolating switch separating brake position contact, main transformer 1 low-pressure side circuit breaker, bus plug-in strip, main transformer plug-in strip separating brake position contact;
It is characterized in that: the separating brake contact in each side circuit breaker of described transformer and the isolating switch is arranged in the respective switch amount input circuit in the differential protection; input variable with its terminal in this differential protection is a respective side locking amount; after the amount of opening in the differential protective device shows the current potential input, promptly pass through the magnitude of current of internal processes locking respective side.
As shown in Figure 6; the trip position contact back parallel with one another that in the high side switch terminal box transformer high-voltage side circuit breaker, high-voltage side bus is separated in switch, the high-pressure side line disconnecting switch is thrown in the respective switch amount input circuit that moves back pressing plate introducing differential protection by the switching value input; and the input variable of this terminal of definition is a high-pressure side locking amount in the differential protection program, experiences when differential protection and passes through the on high-tension side magnitude of current of internal processes locking after this amount of opening has the current potential input.
Do not repeat them here at the use principle of the low-pressure side of the high-pressure subsection side of differential protection and differential protection such as the logic of Fig. 5.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can not depart from spirit of the present utility model or surmount the defined scope of appended claims.

Claims (4)

1. relay protection circuit that prevents the transformer differential protection malfunction comprises:
The input of main transformer differential protective device 1 is the secondary current of line attachment current transformer, mother stock current transformer and main transformer 1 low-pressure side current transformer respectively;
The output of main transformer differential protective device 1 inserts main transformer 1 high-pressure side line-breaker, bus isolating switch, line disconnecting switch separating brake position contact respectively; High-pressure side mother stock switch, I section bus isolating switch, II section bus isolating switch separating brake position contact, main transformer 1 low-pressure side circuit breaker, bus plug-in strip, main transformer plug-in strip separating brake position contact;
It is characterized in that: the separating brake position contact in each side circuit breaker of described transformer and the isolating switch is arranged in the respective switch amount input circuit in the differential protection; input variable with its terminal in this differential protection is a respective side locking amount; after the amount of opening in the differential protective device shows the current potential input, promptly pass through the magnitude of current of internal processes locking respective side.
2. the protective relaying device that prevents the transformer differential protection malfunction according to claim 1 is characterized in that: comprise in the high side switch terminal box in the described differential protection that the high-pressure side circuit breaker divides position contact, high-voltage side bus isolating switch to divide position contact and high-pressure side line disconnecting switch to divide the position contact; Three back parallel with one another is thrown by the input of position, high-pressure side optocoupler and is moved back in the pressing plate input differential protection.
3. the protective relaying device that prevents the transformer differential protection malfunction according to claim 1 and 2 is characterized in that: comprise in the high-pressure subsection side switch terminal case in the described differential protection that high-pressure subsection side circuit breaker divides position contact, high-pressure subsection side bus isolating switch to divide position contact and high-pressure subsection side line road isolating switch to divide the position contact; Three back parallel with one another is thrown by the input of segmentation position, high-pressure side optocoupler and is moved back in the pressing plate input differential protection.
4. the protective relaying device that prevents the transformer differential protection malfunction according to claim 3 is characterized in that: comprise in the low-side switch terminal box in the described differential protection that the low-pressure side circuit breaker divides position contact, low-pressure side bus isolating switch to divide position contact and low-pressure side line disconnecting switch to divide the position contact; Three back parallel with one another is thrown by the input of low-pressure side position optocoupler and is moved back in the pressing plate input differential protection.
CN201020176169XU 2010-04-30 2010-04-30 Relay protection circuit preventing transformer differential protection malfunction Expired - Lifetime CN201789272U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201020176169XU CN201789272U (en) 2010-04-30 2010-04-30 Relay protection circuit preventing transformer differential protection malfunction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201020176169XU CN201789272U (en) 2010-04-30 2010-04-30 Relay protection circuit preventing transformer differential protection malfunction

Publications (1)

Publication Number Publication Date
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103545799A (en) * 2013-11-01 2014-01-29 北京四方继保自动化股份有限公司 Circuit differential protection method automatically adapting to external bridge circuit
CN103606903A (en) * 2013-11-18 2014-02-26 国家电网公司 Bus differential motion protection locking device and method for realizing bus differential motion protection locking by utilizing bus differential motion protection locking device
CN104362735A (en) * 2014-11-06 2015-02-18 山东中实易通集团有限公司 Method for narrowing outage range of power station
CN106885959A (en) * 2017-02-14 2017-06-23 山东中实易通集团有限公司 The total firing test grounding switch of power plant electricity replaces the test method of short-circuiting copper bar
CN106159917B (en) * 2016-08-16 2018-08-07 国网江苏省电力公司无锡供电公司 Power distribution network indulges the relay protection system of sequence accelerated motion
CN109167337A (en) * 2018-09-12 2019-01-08 合肥多元节电科技有限公司 A kind of novel three-winding transformer differential protective system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103545799A (en) * 2013-11-01 2014-01-29 北京四方继保自动化股份有限公司 Circuit differential protection method automatically adapting to external bridge circuit
CN103606903A (en) * 2013-11-18 2014-02-26 国家电网公司 Bus differential motion protection locking device and method for realizing bus differential motion protection locking by utilizing bus differential motion protection locking device
CN103606903B (en) * 2013-11-18 2017-02-22 国家电网公司 Bus differential motion protection locking device and method for realizing bus differential motion protection locking by utilizing bus differential motion protection locking device
CN104362735A (en) * 2014-11-06 2015-02-18 山东中实易通集团有限公司 Method for narrowing outage range of power station
CN106159917B (en) * 2016-08-16 2018-08-07 国网江苏省电力公司无锡供电公司 Power distribution network indulges the relay protection system of sequence accelerated motion
CN106885959A (en) * 2017-02-14 2017-06-23 山东中实易通集团有限公司 The total firing test grounding switch of power plant electricity replaces the test method of short-circuiting copper bar
CN106885959B (en) * 2017-02-14 2020-03-06 山东中实易通集团有限公司 Test method for replacing short-circuit copper bar by grounding knife switch in power plant electric main start test
CN109167337A (en) * 2018-09-12 2019-01-08 合肥多元节电科技有限公司 A kind of novel three-winding transformer differential protective system

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Granted publication date: 20110406