CN113013857A

CN113013857A - 220kV inner bridge connection transformer substation circuit breaker failure relay protection method

Info

Publication number: CN113013857A
Application number: CN202110498727.7A
Authority: CN
Inventors: 孙东杰; 张勐; 张大林; 刘昶; 熊炜; 费吉; 朱学勇; 朱文韬; 夏超; 马骏毅; 周杨; 笪涛; 姜正驰; 戴星宇; 张亚斌; 谢晓清; 衡曲; 汤大海; 赵媛
Original assignee: State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch; State Grid Jiangsu Electric Power Co Ltd; Danyang Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Current assignee: State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch; State Grid Jiangsu Electric Power Co Ltd; Danyang Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-06-22
Anticipated expiration: 2041-05-08
Also published as: CN113013857B

Abstract

The invention discloses a 220kV inner bridge connection transformer substation circuit breaker failure relay protection method which is applied to a 220kV inner bridge connection transformer substation, is simple in action principle and high in reliability aiming at the condition that a 220kV line circuit breaker and a 220kV inner bridge circuit breaker are out of order, and is a relay protection method for rapidly removing faults by jumping off adjacent circuit breakers of the failure circuit breakers. According to the method, the circuit breaker protection devices are respectively arranged on 3 circuit breakers of the inner bridge connection line, the protection devices realize the corresponding circuit breaker failure protection logic function, and are matched with transformer protection and line protection to realize the purpose of tripping off adjacent circuit breakers of the failure circuit breakers to remove faults, so that the 220kV inner bridge connection substation circuit breaker failure relay protection function is realized, and the method is simple and practical. When the 220kV line circuit breaker on the side fails, the opposite side circuit breaker is remotely tripped through the remote tripping function of the 220kV line optical fiber current differential protection, new equipment does not need to be added, and the method is good in economy and strong in realizability.

Description

220kV inner bridge connection transformer substation circuit breaker failure relay protection method

Technical Field

The invention relates to a 220kV inner bridge connection transformer substation circuit breaker failure relay protection method, and belongs to the technical field of electric power transmission and distribution network control.

Background

According to the requirements of GB/T14285 technical rules for relay protection and safety automatic devices and national grid equipment (2018) 979 national grid company for issuing eighteen major accident countermeasures of power grids, a transformer with voltage class of 220kV or above is required to be provided with circuit breaker failure protection. However, in the actual operation of the 220kV line breaker and the 220kV internal bridge breaker of the 220kV internal bridge wiring substation, no specific implementation scheme is given, and no corresponding typical design scheme is provided, when the 220kV transformer differential protection, the backup protection action trip the 220kV line breaker, the 220kV internal bridge breaker or the 220kV line protection action trip the 220kV line breaker, if the above-mentioned breaker fails, the fault point needs to be removed by the backup section action of the power side substation line protection, the fault removal time is long, which endangers the safe and stable operation of the power transmission and transformation equipment and the power grid.

The breaker failure protection means that when the relay protection action of the fault electrical equipment sends a trip command and the breaker fails, the breaker failure judgment is formed by utilizing the protection action information of the fault equipment and the current information of the circuit breaker which fails, other related circuit breakers in the same station can be cut off in a short time limit, the power failure range is limited to the minimum, the stable operation of the whole power grid is ensured, and the serious burning loss of fault elements such as a generator and a transformer and the breakdown and collapse accidents of the power grid are avoided. The breaker failure protection is an important protection type as an important near backup protection for a power grid and main equipment, and directly influences the stable operation of a power system. Therefore, the technical scheme for the relay protection for rapidly removing the fault point is provided to the current situation that the 220kV line circuit breaker and the 220kV inner bridge circuit breaker in the 220kV inner bridge wiring transformer substation are not provided with failure protection, and the technical scheme is of great significance when the 220kV line circuit breaker and the 220kV inner bridge circuit breaker of the 220kV inner bridge wiring transformer substation are out of order.

Disclosure of Invention

The invention aims to provide a 220kV inner bridge connection transformer substation circuit breaker failure relay protection method which is applied to a 220kV inner bridge connection transformer substation, is simple in action principle and high in reliability aiming at the condition that a 220kV line circuit breaker and a 220kV inner bridge circuit breaker are out of order, and is a relay protection method for rapidly removing faults by jumping off adjacent circuit breakers of the failure circuit breakers.

The purpose of the invention is realized by the following technical scheme:

a220 kV inner bridge connection transformer substation circuit breaker failure relay protection method comprises the following steps:

first, control process of breaker 1DL failure protection

1.1 Circuit breaker 1DL Circuit breaker failure functional logic

A breaker protection device is arranged on the breaker 1DL, and the current of the breaker protection device is connected with a secondary loop of a current transformer TA 1; set up circuit breaker failure protect function in the circuit breaker protection device, include:

(1) the current discrimination function is provided: the phase A or B or C phase current of a current transformer TA1 connected with a circuit breaker 1DL meets the condition that the phase A or B or C phase current of TA1 is not less than a setting value, or the negative sequence current of TA1 is not less than a setting value, or the zero sequence current 3Io of TA1 is not less than a setting value;

(2) the corresponding protection tripping contact is connected with an electrical quantity protection 1 outlet tripping relay contact 1CKJ1 and a 1LP1 pressing plate of a No. 1 transformer or an electrical quantity protection 2 outlet tripping relay contact 1CKJ2 and a 1LP2 pressing plate of a No. 1 transformer;

(3) loop with delay and start trip: the delay t1 starts an outlet relay contact 1BCJ1 or an outlet relay contact 1BCJ2, and the outlet relay contact 1BCJ1 or the outlet relay contact 1BCJ2 is respectively connected with a remote tripping loop of a 220kV transformer substation 220kV line L1 protection 1 or a remote tripping loop of a line L1 protection 2; the delay t2 starts an outlet relay contact 1BCJ3 or an outlet relay contact 1BCJ4, and the outlet relay contact 1BCJ or the outlet relay contact 1BCJ is respectively connected with a failure joint tripping loop of a No. 1 transformer protection 1 of the 220kV transformer substation or a failure joint tripping loop of a No. 1 transformer protection 2 of the 220kV transformer substation;

1.2 Circuit breaker 1DL failure protection Start Condition

(1) The corresponding protection tripping contact opening interface of the breaker protection device of the breaker 1DL has an opening signal: namely, the electrical quantity protection 1 outlet trip relay contact 1CKJ1 of the No. 1 transformer is in an operating state and the 1LP1 pressing plate is put into operation, or the electrical quantity protection 2 outlet trip relay contact 1CKJ2 of the No. 1 transformer is in an operating state and the 1LP2 pressing plate is put into operation;

(2) the breaker protection current discrimination function of the breaker 1DL is started: namely, the phase A or phase B or phase C current of the current transformer TA1 of the circuit breaker 1DL is not less than the setting value, or the TA1 negative sequence current is not less than the setting value, or the TA1 zero sequence current 3Io is not less than the setting value;

1.3 Circuit breaker 1DL Circuit breaker Outlet trip

When the above 1.2 condition is satisfied, the breaker protection of the breaker 1 DL:

(1) the time delay t1 is connected with the outlet relay contact 1BCJ1, and the 3LP1 pressure plate is put into; or the time delay t1 is used for connecting an outlet relay contact 1BCJ2, a 3LP2 pressing plate is used for connecting a remote tripping loop of a 220kV transformer substation 220kV line L1 protection 1 or a remote tripping loop of a line L1 protection 2, a fiber channel of the 220kV transformer substation 220kV line L1 protection 1 or a fiber channel of the line L1 protection 2 is connected through a line L1, the 220kV line L1 opposite side protection 1 tripping loop or the 220kV line L1 opposite side protection 2 tripping loop is started, and a line breaker 4DL of the power supply side transformer substation 1 is tripped;

(2) the time delay t2 is connected with the outlet relay contact 1BCJ3, and the 3LP3 pressure plate is put into; or the time delay t2 is connected with the contact point 1BCJ4 of the outlet relay, and the 3LP4 pressing plate is put into use, and the failure combined tripping loops of the No. 1 transformer protection 1 and the No. 2 transformer protection of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of the No. 1 transformer protection 1 or a failure joint tripping loop of the No. 1 transformer protection 2 passes through the No. 1 transformer current judgment 1 or the No. 1 transformer current judgment 2, after 50ms delay, starting a No. 1 transformer outlet relay to trip circuit breakers on all sides of the No. 1 transformer, namely an inner bridge circuit breaker 3DL, a No. 1 transformer high-voltage side circuit breaker 1DL, a medium-voltage side circuit breaker 6DL and a low-voltage side circuit breaker 8 DL;

second, control procedure for 2DL failure protection of circuit breaker

2.1 Circuit breaker 2DL Circuit breaker failure functional logic

Set up circuit breaker protection device at circuit breaker 2DL, circuit breaker protection device current connects current transformer TA 2's corresponding secondary circuit, sets up the circuit breaker failure protect function in the circuit breaker protection device, includes:

(1) the current discrimination function is provided: the phase A or B or C phase current of a current transformer TA2 of a circuit breaker 2DL is connected, and the phase A or B or C phase current of TA2 is not less than a setting value, or the negative sequence current of TA2 is not less than the setting value, or the zero sequence current 3Io of TA2 is not less than the setting value;

(2) the corresponding protection tripping contact is connected with an electrical quantity protection 1 outlet tripping relay contact 2CKJ1 and a 2LP1 pressing plate of a No. 2 transformer or an electrical quantity protection 2 outlet tripping relay contact 2CKJ2 and a 4LP2 pressing plate of a No. 2 transformer;

(3) loop with delay and start trip: the delay t1 starts an outlet relay contact 2BCJ1 or an outlet relay contact 4BCJ2, and the outlet relay contact is respectively connected with a remote tripping loop of a 220kV transformer substation 220kV line L2 protection 1 or a remote tripping loop of a line L2 protection 2; the delay t2 starts an outlet relay contact 2BCJ3 or an outlet relay contact 2BCJ4, and the outlet relay contact 2BCJ3 or the outlet relay contact 2BCJ4 is respectively connected with a failure joint tripping loop of the No. 2 transformer protection 1 of the 220kV transformer substation or connected with a failure joint tripping loop of the No. 2 transformer protection 2 of the 220kV transformer substation;

2.2 breaker 2DL failure protection start condition:

(1) the corresponding protection tripping contact opening interface of the breaker protection device of the breaker 2DL has an opening signal: namely, the electrical quantity protection 1 outlet trip relay contact 2CKJ1 of the No. 2 transformer is in an active state and the 2LP1 pressing plate is put into operation, or the electrical quantity protection 2 outlet trip relay contact 2CKJ2 of the No. 2 transformer is in an active state and the 2LP2 pressing plate is put into operation;

(2) the breaker protection current discrimination function of the breaker 2DL is started: namely, the phase A or phase B or phase C current of the current transformer TA2 of the circuit breaker 2DL is not less than the setting value, or the TA2 negative sequence current is not less than the setting value, or the TA2 zero sequence current 3Io is not less than the setting value;

2.3 Circuit breaker 2DL Circuit breaker Outlet trip

When the above 2.2 condition is satisfied, the breaker protection of the breaker 2 DL:

(1) the time delay t1 turns on the outlet relay contact 2BCJ1 and the 4LP1 pressing plate is turned on, or the time delay t1 turns on the outlet relay contact 2BCJ2 and the 4LP2 pressing plate is turned on; the method comprises the steps of switching on a remote trip circuit of a 220kV transformer substation 220kV line L2 protection 1 or a remote trip circuit of a line L2 protection 2, protecting an optical fiber channel of the line 1 or an optical fiber channel of the line L2 protection 2 through a line L2, starting a trip circuit of the opposite side protection 1 of the 220kV line L2 or a trip circuit of the opposite side protection 2 of the 220kV line L2, and tripping off a line breaker 5DL of the power side transformer substation 2;

(2) the time delay t2 turns on the outlet relay contact 2BCJ3 and the 4LP3 pressing plate is turned on, or the time delay t2 turns on the outlet relay contact 2BCJ4 and the 4LP4 pressing plate is turned on; respectively connecting failure joint tripping loops of No. 2 transformer protection 1 and No. 2 transformer protection of a 220kV transformer substation; after a failure joint tripping loop of the No. 2 transformer protection 1 or a failure joint tripping loop of the No. 2 transformer protection 2 passes through the No. 2 transformer current judgment 1 or the No. 1 transformer current judgment 2, after 50ms delay, starting a No. 2 transformer outlet relay to trip circuit breakers on all sides of the No. 2 transformer, namely an inner bridge circuit breaker 3DL, a No. 2 transformer high-voltage side circuit breaker 2DL, a medium-voltage side circuit breaker 7DL and a low-voltage side circuit breaker 9 DL;

control process for failure of inner bridge circuit breaker

3.1 inner bridge breaker 3DL breaker failure function logic

At inner bridge circuit breaker 3DL setting up circuit breaker protection device, circuit breaker protection device current connects current transformer TA 3's corresponding secondary circuit, sets up the circuit breaker failure protect function in the circuit breaker protection device, includes:

(1) the current discrimination function is provided: the current of the phase A or the phase B or the phase C of a current transformer TA3 of the inner bridge circuit breaker 3DL is connected, and the condition that the phase A or the phase B or the phase C of TA3 is not less than a setting value, or the negative sequence current of TA3 is not less than the setting value, or the zero sequence current 3Io of TA3 is not less than the setting value is met;

(2) the interface circuit is opened with corresponding protection tripping contacts, namely an electrical quantity protection 1 outlet tripping relay contact 1CKJ3 and a 1LP3 pressing plate of a No. 1 transformer or an electrical quantity protection 2 outlet tripping relay contact 1CKJ4 and a 1LP4 pressing plate of a No. 1 transformer;

(3) the circuit with time delay and starting trip comprises a time delay t3, an outlet relay contact 3BCJ1 or an outlet relay contact 3BCJ2 are connected with a failure joint trip circuit of a No. 1 transformer protection 1 and a No. 1 transformer protection 2 of a 220kV transformer substation respectively; the time delay t4 is connected with an outlet relay contact 3BCJ3 or an outlet relay contact 3BCJ4, and the failure combined tripping circuits of the No. 2 transformer protection 1 and the No. 2 transformer protection 2 of the 220kV transformer substation are respectively connected;

3.2 internal bridge circuit breaker 3DL failure protection starting condition:

(1) the circuit breaker protection device of the inner bridge circuit breaker 3DL has an open signal corresponding to the protection trip contact open interface, namely the electrical quantity protection 1 outlet trip relay contact 1CKJ3 of the No. 1 transformer is in an action state and the 1LP3 pressing plate is put into use, or the electrical quantity protection 2 outlet trip relay contact 1CKJ4 of the No. 1 transformer is in an action state and the 1LP4 pressing plate is put into use, or the electrical quantity protection 1 outlet trip relay contact 2CKJ3 of the No. 2 transformer is in an action state and the 2LP3 pressing plate is put into use, or the electrical quantity protection 2 outlet trip relay contact 2CKJ4 of the No. 2 transformer is in an action state and the 2LP4 pressing plate is put into use;

(2) the circuit breaker protection current discrimination function of the inner bridge circuit breaker 3DL is started, namely the A-phase or B-phase or C-phase current of a current transformer TA3 of the inner bridge circuit breaker 3DL is not less than a setting value, or the negative sequence current of TA3 is not less than the setting value, or the zero sequence current 3Io of TA3 is not less than the setting value;

3.3 inner bridge Circuit breaker 3 DL's breaker protection outlet trip

When the above 3.2 condition is satisfied, the breaker protection of the inner bridge breaker 3 DL:

(1) the time delay t3 is connected with an outlet relay contact 3BCJ1 and a 5LP1 pressing plate to be switched in, or the time delay t3 is connected with an outlet relay contact 3BCJ2 and a 5LP2 pressing plate to be switched in, and the failure combined tripping loops of No. 1 transformer protection 1 and No. 2 transformer protection of the 220kV transformer substation are respectively switched in; after a failure joint tripping loop of the No. 1 transformer protection 1 or a failure joint tripping loop of the No. 1 transformer protection 2 passes through the No. 1 transformer current judgment 1 or the No. 1 transformer current judgment 2, after 50ms delay, starting a No. 1 transformer outlet relay to trip circuit breakers on all sides of the No. 1 transformer, namely an inner bridge circuit breaker 3DL, a No. 1 transformer high-voltage side circuit breaker 1DL, a medium-voltage side circuit breaker 6DL and a low-voltage side circuit breaker 8 DL;

(2) the time delay t4 is used for switching on an outlet relay contact 3BCJ3 and 5LP3 pressing plate to be switched on, or the time delay t4 is used for switching on an outlet relay contact 3BCJ4 and 5LP4 pressing plate to be switched on, and failure combined tripping loops of No. 2 transformer protection 1 and No. 2 transformer protection 2 of the 220kV transformer substation are respectively switched on; after a failure joint tripping loop of the No. 2 transformer protection 1 or a failure joint tripping loop of the No. 2 transformer protection 2 passes through the No. 2 transformer current judgment 1 or the No. 2 transformer current judgment 2, after 50ms delay, starting a No. 2 transformer outlet relay to trip circuit breakers on all sides of the No. 2 transformer, namely an inner bridge circuit breaker 3DL, a No. 2 transformer high-voltage side circuit breaker 2DL, a medium-voltage side circuit breaker 7DL and a low-voltage side circuit breaker 9 DL;

and a failure joint tripping loop is respectively arranged in the transformer protection device 1 or the transformer protection device 2:

(1) the current discrimination function is provided: a phase A or B or C phase current discrimination loop, or a negative sequence current discrimination loop, or a zero sequence current discrimination loop of the No. 1 transformer is adopted; the No. 1 transformer current discrimination loop is formed by corresponding secondary currents of a current transformer TA1 and a current transformer TA3 in a transformer protection device and completes current measurement and collection;

(2) the corresponding protection tripping contact is opened into the interface:

1)1, protecting a 1-failure joint tripping loop by a transformer: breaker protection trip outlet relay contacts 1BCJ3 and 3LP3 hold down of line 1 breaker 1 DL; or the breaker protection trip outlet relay contacts 3BCJ1 and 5LP1 press plate of the inner bridge breaker 3 DL;

2) no. 1 transformer protection 2 failure joint tripping loop: breaker protection trip outlet relay contacts 2BCJ4 and 4LP4 hold down of line 1 breaker 1 DL; or the breaker protection trip outlet relay contacts 3BCJ2 and 5LP2 press plate of the inner bridge breaker 3 DL;

(3) after delaying 50ms, starting a No. 1 transformer tripping outlet relay to trip a circuit breaker loop on each side of the No. 1 transformer;

the No. 2 transformer protection device 1 or the No. 2 transformer protection device 2 is internally provided with respective failure joint tripping loops:

(1) the current discrimination function is provided: a phase A or B or C phase current discrimination loop, or a negative sequence current discrimination loop, or a zero sequence current discrimination loop of a No. 2 transformer is adopted; the No. 2 transformer current discrimination loop is formed by current transformers TA2 and TA3 corresponding secondary current transformer protection devices and current, and current measurement and collection are completed;

(2) the corresponding protection tripping contact is opened into the interface:

1) no. 2 transformer protection 1 failure joint tripping loop: breaker protection trip outlet relay contacts 2BCJ3 and 4LP3 hold down of line 2 breaker 2 DL; or the breaker protection trip outlet relay contacts 3BCJ3 and 5LP3 press plate of the inner bridge breaker 3 DL;

2) no. 2 transformer protection 2 failure joint tripping loop: breaker protection trip outlet relay contacts 2BCJ4 and 4LP4 hold down of line 2 breaker 2 DL; or the breaker protection trip outlet relay contacts 3BCJ4 and 5LP4 press plate of the inner bridge breaker 3 DL;

(3) after delaying 50ms, starting a No. 2 transformer tripping outlet relay to trip a circuit breaker loop on each side of the No. 2 transformer.

The object of the invention can be further achieved by the following technical measures:

the 220kV inner bridge connection transformer substation circuit breaker failure relay protection method comprises the following steps: differential protection of a No. 1 transformer, backup protection at 220kV side and other protection; other protections comprise a 110kV side backup protection of the No. 1 transformer or a 35kV side or 10kV side backup protection combined tripping transformer high-voltage side 1DL or 3DL circuit breaker; if the No. 1 transformer is a three-winding transformer, other protection also comprises transformer neutral point gap protection: gap zero-sequence current protection and gap zero-sequence voltage protection;

the electric quantity protection of No. 2 transformer includes: differential protection of No. 2 transformer, backup protection at 220kV side, and other protection; other protections comprise a 110kV side backup protection of the No. 2 transformer or a 35kV side or 10kV side backup protection 2DL or 3DL circuit breaker on the high-voltage side of the combined tripping transformer; if the No. 2 transformer is a three-winding transformer, other protection also comprises transformer neutral point gap protection: gap zero sequence current protection and gap zero sequence voltage protection.

According to the 220kV internal bridge connection transformer substation circuit breaker failure relay protection method, the protection of the 220kV line L1 comprises the following steps: the method comprises the following steps of (1) line optical fiber current differential protection, interphase distance protection, grounding distance protection and direction zero sequence protection; the protection of the 220kV line L2 comprises the following steps: the method comprises the steps of line optical fiber current differential protection, interphase distance protection, grounding distance protection and direction zero sequence protection.

According to the 220kV internal bridging substation circuit breaker failure relay protection method, t1 is a delay setting value of a 4DL circuit breaker of a 220kV power supply side substation 1, wherein a remote tripping function of L1 optical fiber differential protection of a line is started in a circuit breaker protection device of the circuit breaker 1 DL; or t1 is a remote tripping function of starting line L2 optical fiber differential protection in a breaker protection device of the breaker 2DL, the delay setting value of a 5DL breaker of the transformer substation 2 at the remote tripping 220kV power supply side is set, and t1 takes 150 milliseconds;

t2 is a setting value of the time delay of the failure jump circuit of the No. 1 transformer or the No. 2 transformer respectively started in the breaker protection device of the breaker 1DL or the breaker protection device of the breaker 2DL, and t2 takes 150 milliseconds.

t3 and t4 are setting values of the time delay of the failure jump circuit of the No. 1 transformer and the No. 2 transformer respectively started in the breaker protection device of the inner bridge breaker 3DL, and the t3 and the t4 take 150 milliseconds.

The method for judging whether the A phase, the B phase or the C phase of the circuit breakers 1DL, 2DL and the inner bridge breaker 3DL have current in the breaker protection device of the breaker 1DL, the breaker protection device of the breaker 2DL or the breaker protection device of the inner bridge breaker 3DL and the transformer protection device of the No. 1DL or the transformer protection device of the No. 2DL is to respectively collect the current of the current transformers TA1, TA2 and TA3 of the 220kV circuit breakers 1DL, 2DL and the inner bridge breaker 3DL, and judge whether fault current exists according to phase current or negative sequence current or zero sequence current; the setting requirements of the phase current, the negative sequence current and the zero sequence current are as follows (the protection range of the failure protection comprises buses at each side of the transformer):

phase current fixed value setting: setting the sufficient sensitivity of the two-phase short-circuit fault according to the minimum operation mode of the 35kV side or the 10kV side of the transformer, wherein the sensitivity coefficient is more than or equal to 1.5;

setting a negative sequence current fixed value: setting enough sensitivity according to the two-phase short circuit fault of a low-voltage side bus of the transformer in the minimum operation mode, wherein the sensitivity coefficient is more than or equal to 2.0;

setting a zero-sequence current fixed value: the minimum grounding short circuit fault of the 110kV side bus of the transformer in the minimum operation mode has enough sensitivity setting, and the sensitivity coefficient is more than or equal to 2.0.

According to the 220kV inner bridge connection transformer substation circuit breaker failure relay protection method, protection configuration requirements of a 220kV line L1 and a line L2 are as follows: when the line breakers 1DL and 2DL are failed, the 4DL and 5DL breakers of the opposite-side substation are required to be tripped through the remote tripping function of the optical fiber current differential protection of the line L1 and the line L2, so the 220kV line L1 and the line L2 need to be provided with the optical fiber current differential protection, and the local-side protection remote starting tripping function is provided for the 5DL breakers of the 4DL and 220kV substations 2 of the opposite-side 220kV substation 1.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the method, the circuit breaker protection devices are respectively arranged on 3 circuit breakers of the inner bridge connection line, the protection devices realize the corresponding circuit breaker failure protection logic function, and are matched with transformer protection and line protection to realize the purpose of tripping off adjacent circuit breakers of the failure circuit breakers to remove faults, so that the 220kV inner bridge connection substation circuit breaker failure relay protection function is realized, and the method is simple and practical.

2. When the 220kV line circuit breaker on the side fails, the opposite side circuit breaker is remotely tripped through the remote tripping function of the 220kV line optical fiber current differential protection, new equipment does not need to be added, and the method is good in economy and strong in realizability.

Drawings

FIG. 1 is a primary main wiring diagram of a 220kV substation;

fig. 2 is a logic diagram of failure protection of 220kV internal bridging substation circuit breaker 1 DL;

fig. 3 is a logic diagram of 220kV internal bridging substation circuit breaker 2DL failure protection;

fig. 4 is a logic diagram of the failure protection of the inner bridge circuit breaker 3DL in the 220kV inner bridge wiring substation;

FIG. 5 is a logic diagram of a 220kV inner bridge connection substation No. 1 transformer protection No. 1 failure joint tripping protection;

FIG. 6 is a logic diagram of a 220kV inner bridge connection substation No. 1 transformer protection No. 2 failure joint tripping protection;

FIG. 7 is a logic diagram of a 220kV inner bridge connection substation No. 2 transformer protection No. 1 failure joint tripping protection;

fig. 8 is a logic diagram of the 220kV internal bridging substation number 2 transformer protection No. 2 failure joint tripping protection.

The symbols in fig. 1 are illustrated as follows:

expressing a logical AND relationship, namely when all input conditions are met, the output is effective;

-representing a logical or relationship, i.e. the output is valid when any of the input conditions is fulfilled;

-indicating that the input condition satisfies the delay t1 action, the input condition does not satisfy the 0 second return;

-indicating that the input condition satisfies the delay t2 action, the input condition does not satisfy the 0 second return;

-indicating that the input condition satisfies the delay t3 action, the input condition does not satisfy the 0 second return;

-indicating that the input condition satisfies the delay t4 action, the input condition does not satisfy the 0 second return;

the input condition is represented to meet the action of delaying 50ms, and the input condition is not satisfied with the action of returning for 0 second;

-represents a normally open contact of the outlet relay;

-represents a connection pressure plate, the pressure plate being switched on as: putting a pressing plate; platen break is expressed as: and (5) withdrawing the pressing plate.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

The method is suitable for the transformer substation in a 220kV internal bridge connection mode. As shown in fig. 1, the primary main wiring diagram of a part of a 220kV substation is provided, the substation is provided with two sections of 220kV buses, and a circuit breaker 1DL of a 220kV line L1, a 220kV i-section bus voltage transformer TV3 and a 220kV1 number transformer are connected to the 220kV i-section bus. The circuit breaker 1DL is connected with a circuit breaker 4DL of a power side 220kV transformer substation 1 through a 220kV circuit L1, a circuit voltage transformer TV1 is arranged on a circuit L1 of the 220kV transformer substation, a current transformer TA1 is arranged between the circuit breaker 1DL and a line side disconnecting switch, and a current transformer TA4 is arranged between the circuit breaker 4DL and the line side disconnecting switch. In addition, the No. 1 transformer is an auto-coupling or three-winding transformer, and the transformer is respectively connected with a middle-voltage side I-section bus and a low-voltage side I-section bus through circuit breakers 6DL and 8 DL. A circuit breaker 2DL of a 220kV line L2, a 220kV II bus voltage transformer TV4 and a 220kV2 number transformer are connected to the 220kV II bus. The breaker 2DL is connected with the breaker 5DL of the power side 220kV transformer substation 2 through a 220kV line L2, a line voltage transformer TV2 is arranged on a line L2 of the 220kV transformer substation, a current transformer TA2 is arranged between the breaker 2DL and a line side disconnecting switch, and a current transformer TA5 is arranged between the breaker 5DL and the line side disconnecting switch. In addition, the No. 2 transformer is an auto-coupling or three-winding transformer, and the transformer is respectively connected with a middle-voltage side II-section bus and a low-voltage side II-section bus through circuit breakers 7DL and 9 DL. A220 kV I section bus and a II section bus are connected through an inner bridge circuit breaker 3DL, and a current transformer TA3 is arranged between the 3DL circuit breaker and the II section bus side disconnecting switch. The No. 1 and No. 2 transformers are step-down transformers.

The following gives an example of the implementation of the relay protection of the method applied to the 220kV line breaker and the failure of the inner bridge breaker of the 220kV inner bridge connection substation, and the protection logic is shown in fig. 2-8:

1. breaker 1DL, 3DL operation, breaker 2DL hot standby state

1.1 Circuit breaker 1DL failure

When the circuit breaker 1DL fails, an open signal is provided to a corresponding protection trip contact open-in interface of a circuit breaker protection device of the circuit breaker 1DL, namely, an electrical quantity protection 1 outlet trip relay contact 1CKJ1(1LP1 pressing plate input) of a No. 1 transformer or an electrical quantity protection 2 outlet trip relay contact 1CKJ2(1LP2 pressing plate input) of a No. 1 transformer is in an action state; meanwhile, the circuit breaker protection current discrimination function of the circuit breaker 1DL is started, namely the phase A or phase B or phase C current of a current transformer TA1 of the circuit breaker 1DL is not less than a setting value, or the negative sequence current of TA1 is not less than a setting value, or the zero sequence current 3Io of TA1 is not less than a setting value; when the above conditions are satisfied, the breaker protection of the breaker 1 DL:

(1) the delay t1 is connected with an outlet relay contact 1BCJ1(3LP1 pressing plate input) or an outlet relay contact 1BCJ2(3LP2 pressing plate input), a remote tripping circuit of a 220kV transformer substation 220kV line L1 protection 1 or a remote tripping circuit of a line L1 protection 2 is connected, an optical fiber channel of the protection 1 or the protection 2 is protected through a line L1, a tripping circuit of the 220kV line L1 for the side protection 1 or the side protection 2 is started, and a line breaker 4DL of the power source side transformer substation 1 is tripped.

(2) The time delay t2 is connected with an outlet relay contact 1BCJ3(3LP3 pressing plate is switched in) or an outlet relay contact 1BCJ4(3LP4 pressing plate is switched in), and the failure combined tripping loops of the No. 1 transformer protection 1 and the No. 2 transformer protection of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of the No. 1 transformer protection 1 or a failure joint tripping loop of the No. 1 transformer protection 2 of the 220kV transformer substation is judged to be 1 or 2 through the No. 1 transformer current, the No. 1 transformer outlet relay is started to trip circuit breakers on all sides of the No. 1 transformer (namely an inner bridge circuit breaker 3DL, a No. 1 transformer high-voltage side circuit breaker 1DL, a medium-voltage side circuit breaker 6DL and a low-voltage side circuit breaker 8DL) through 50ms delay, and the fault is removed.

1.2 inner bridge breaker 3DL failure

When the inner bridge circuit breaker 3DL is out of order, the circuit breaker protection device of the inner bridge circuit breaker 3DL has an open-in signal at the corresponding protection trip contact open-in interface, namely the electrical quantity protection 1 outlet trip relay contact 1CKJ3(1LP3 pressing plate put in) of the No. 1 transformer or the electrical quantity protection 2 outlet trip relay contact 1CKJ4(1LP4 pressing plate put in) of the No. 1 transformer is in an action state; meanwhile, the circuit breaker protection current discrimination function of the inner bridge circuit breaker 3DL is started, namely the A-phase or B-phase or C-phase current of a current transformer TA3 of the 220kV inner bridge circuit breaker 3DL is not less than a setting value, or the negative sequence current of TA3 is not less than a setting value, or the zero sequence current 3Io of TA3 is not less than a setting value;

when the above conditions are satisfied, the breaker protection of the inner bridge breaker 3 DL:

(1) the time delay t3 is connected with an outlet relay contact 3BCJ1(5LP1 pressing plate is switched in) or an outlet relay contact 3BCJ2(5LP2 pressing plate is switched in), and the failure joint tripping loops of the No. 1 transformer protection 1 and the No. 2 transformer protection of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of the No. 1 transformer protection 1 or a failure joint tripping loop of the No. 1 transformer protection 2 of the 220kV transformer substation is judged to be 1 or 2 through the No. 1 transformer current, the No. 1 transformer outlet tripping relay is started to trip circuit breakers on all sides of the No. 1 transformer (namely an inner bridge circuit breaker 3DL, a No. 1 transformer high-voltage side circuit breaker 1DL, a medium-voltage side circuit breaker 6DL and a low-voltage side circuit breaker 8DL) through 50ms delay.

(2) The time delay t4 is connected with an outlet relay contact 3BCJ3(5LP3 pressing plate is switched in) or an outlet relay contact 3BCJ4(5LP4 pressing plate is switched in), and the failure joint tripping loops of the No. 2 transformer protection 1 and the No. 2 transformer protection 2 of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of No. 2 transformer protection 1 or a failure joint tripping loop of No. 2 transformer protection of a 220kV transformer substation is judged to be 1 or 2 through No. 2 transformer current, a 2-number transformer outlet tripping relay is started to trip circuit breakers on all sides of the No. 2 transformer (namely an inner bridge circuit breaker 3DL, a No. 2 transformer medium-voltage side circuit breaker 7DL and a low-voltage side circuit breaker 9DL) through 50ms delay, and the fault is removed.

1.3 failure between inner bridge circuit breaker 3DL and TA3

When a fault occurs between the inner bridge circuit breaker 3DL and the current transformer TA3, the fault point is in the differential protection range of the No. 1 transformer, the differential protection of the No. 1 transformer protection 1 or the No. 2 transformer protection immediately acts, and the three-side circuit breakers (including 1DL, 3DL, 6DL and 8DL) of the No. 1 transformer are tripped. Even so, the failure point still exists. If the breaker 2DL is closed to recover power supply to the No. 2 transformer, the power supply side transformer substation 2 transmits power to the fault point again through the line L2, and the fault point is located outside the range of the No. 2 transformer differential current transformer, so the differential protection of the No. 2 transformer protection 1 or protection 2 cannot act; however, the differential protection of the transformer protection 1 or the protection 2 of No. 1 is started again, that is, the circuit breaker protection device of the inner bridge circuit breaker 3DL has an open signal corresponding to the open interface of the protection trip contact, that is, the electrical quantity protection 1 outlet trip relay contact 1CKJ3(1LP3 pressing plate put in) of the transformer No. 1 or the electrical quantity protection 2 outlet trip relay contact 1CKJ4(1LP4 pressing plate put in) of the transformer No. 1 is in an action state; meanwhile, the circuit breaker protection current discrimination function of the inner bridge circuit breaker 3DL is started, namely the A-phase or B-phase or C-phase current of a current transformer TA3 of the 220kV inner bridge circuit breaker 3DL is not less than a setting value, or the negative sequence current of TA3 is not less than a setting value, or the zero sequence current 3Io of TA3 is not less than a setting value;

the delay t4 starts an outlet relay contact 3BCJ3(5LP3 pressing plate is put into) or an outlet relay contact 3BCJ4(5LP4 pressing plate is put into), and a failure joint tripping loop of the 220kV transformer substation No. 2 transformer protection 1 or a failure joint tripping loop of the 220kV transformer substation No. 2 transformer protection 2 is switched on; after a failure joint tripping loop of the No. 2 transformer protection 1 or a failure joint tripping loop of the No. 2 transformer protection 2 of the 220kV transformer substation is judged to be 1 or 2 through the No. 2 transformer current, the circuit breaker at each side of the No. 2 transformer (namely an inner bridge circuit breaker 3DL, a middle voltage side circuit breaker 7DL and a low voltage side circuit breaker 9DL) is started through 50ms delay, and the fault is removed;

since the differential protection range of the line L2 is between the current transformer TA2 of the line breaker 2DL and the current transformer TA5 of the opposite line breaker 5DL, this fault point is also not within the fiber differential protection range of the line L2. The removal of the fault point needs the action of a backup section protected by the 5DL circuit breaker, and the backup protection removal time is long and exceeds the action time of the circuit breaker failure protection of the 3DL inner bridge circuit breaker, so the backup protection of the 5DL circuit breaker cannot act.

2. Circuit breaker 3DL, 2DL operation, circuit breaker 1DL hot standby state

2.1 breaker 2DL failure

When the circuit breaker 2DL fails, an open signal is provided at a corresponding protection trip contact open-in interface of a circuit breaker protection device of the circuit breaker 2DL, namely, an electrical quantity protection 1 outlet trip relay contact 2CKJ1(2LP1 pressing plate input) of a No. 2 transformer or an electrical quantity protection 2 outlet trip relay contact 2CKJ2(2LP2 pressing plate input) of the No. 2 transformer is in an action state; meanwhile, the circuit breaker protection current discrimination function of the circuit breaker 2DL is started, namely the phase A or phase B or phase C current of a current transformer TA2 of the circuit breaker 2DL is not less than a setting value, or the negative sequence current of TA2 is not less than a setting value, or the zero sequence current 3Io of TA2 is not less than a setting value;

when the above conditions are met, the circuit breaker protection of circuit breaker 2DL at line L2:

(1) the delay t1 is connected with an outlet relay contact 2BCJ1(4LP1 pressing plate input) or an outlet relay contact 4BCJ2(4LP2 pressing plate input), a remote tripping circuit of a 220kV transformer substation 220kV line L2 protection 1 or a remote tripping circuit of a line L2 protection 2 is connected, a fiber channel of the protection 1 or the protection 2 is protected through a line L2, a tripping circuit of the 220kV line L2 for the side protection 1 or the side protection 2 is started, and a line breaker 5DL of the power source side transformer substation 2 is tripped.

(2) The time delay t2 is connected with an outlet relay contact 2BCJ3(4LP3 pressing plate is switched in) or an outlet relay contact 2BCJ4(4LP4 pressing plate is switched in), and the failure joint tripping loops of the No. 2 transformer protection 1 and the No. 2 transformer protection 2 of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of No. 2 transformer protection 1 or a failure joint tripping loop of No. 2 transformer protection of a 220kV transformer substation is judged to be 1 or 2 through No. 2 transformer current, a circuit breaker on each side of No. 2 transformer (namely an inner bridge circuit breaker 3DL, a high-voltage side circuit breaker 2DL, a medium-voltage side circuit breaker 7DL and a low-voltage side circuit breaker 9DL) is started through 50ms delay, and the fault is removed.

2.2 inner bridge breaker 3DL failure

When the inner bridge circuit breaker 3DL is out of order, the circuit breaker protection device of the inner bridge circuit breaker 3DL has an open signal corresponding to the open interface of the protection trip contact, namely the electrical quantity protection 1 outlet trip relay contact 2CKJ3(2LP3 pressing plate put) of the No. 2 transformer or the electrical quantity protection 2 outlet trip relay contact 2CKJ4(2LP4 pressing plate put) of the No. 2 transformer is in an action state; meanwhile, the circuit breaker protection current discrimination function of the inner bridge circuit breaker 3DL is started, namely the A-phase or B-phase or C-phase current of a current transformer TA3 of the 220kV inner bridge circuit breaker 3DL is not less than a setting value, or the negative sequence current of TA3 is not less than a setting value, or the zero sequence current 3Io of TA3 is not less than a setting value;

(2) The time delay t4 is connected with an outlet relay contact 3BCJ3(5LP3 pressing plate is switched in) or an outlet relay contact 3BCJ4(5LP4 pressing plate is switched in), and the failure joint tripping loops of the No. 2 transformer protection 1 and the No. 2 transformer protection 2 of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of No. 2 transformer protection 1 or a failure joint tripping loop of No. 2 transformer protection of a 220kV transformer substation is judged to be 1 or 2 through No. 2 transformer current, a tripping relay at the outlet of the No. 2 transformer is started to trip circuit breakers at all sides of the No. 2 transformer (namely an inner bridge circuit breaker 3DL, a high-voltage side circuit breaker 2DL of the No. 2 transformer, a medium-voltage side circuit breaker 7DL and a low-voltage side circuit breaker 9DL) through 50ms delay, and the fault is removed.

2.3 internal bridge breaker 3DL and TA3 between fault

When a fault occurs between the inner bridge circuit breaker 3DL and the current transformer TA3, the fault is in the differential protection range of the No. 1 transformer, the differential protection of the No. 1 transformer protection 1 and the No. 2 transformer protection immediately acts, and the three-side circuit breakers (including 3DL, 6DL and 8DL) of the No. 1 transformer are opened, even if the fault exists, the fault point still exists. Because the fault point is positioned outside the TA range of the No. 2 transformer differential, the differential protection of the No. 2 transformer protection 1 and the No. 2 transformer protection can not act; however, because the fault point still exists, the differential protection of the 1 st transformer protection 1 and the 2 st protection is not returned all the time, that is, the breaker protection device of the inner bridge breaker 3DL has an open signal corresponding to the open interface of the protection trip contact, that is, the 1 st electrical quantity protection 1 outlet trip relay contact 1CKJ3(1LP3 pressing plate is put into) of the 1 st transformer or the 1 st electrical quantity protection 2 outlet trip relay contact 1CKJ4(1LP4 pressing plate is put into) of the 1 st transformer is in an action state; meanwhile, the circuit breaker protection current discrimination function of the inner bridge circuit breaker 3DL is started, namely the A-phase or B-phase or C-phase current of a current transformer TA3 of the 220kV inner bridge circuit breaker 3DL is not less than a setting value, or the negative sequence current of TA3 is not less than a setting value, or the zero sequence current 3Io of TA3 is not less than a setting value;

3. Breaker 1DL, 2DL operation, breaker 3DL hot standby state

3.1 Circuit breaker 1DL failure

When the circuit breaker 1DL fails, the circuit breaker protection device of the circuit breaker 1DL has an open signal corresponding to the protection trip contact open-in interface, namely the outlet trip relay contact 1CKJ1(1LP1 pressing plate put) of the electrical quantity protection 1 of the No. 1 transformer or the outlet trip relay 1CKJ2(1LP2 pressing plate put) of the electrical quantity protection 2 of the No. 1 transformer is in an action state; meanwhile, the circuit breaker protection current discrimination function of the circuit breaker 1DL is started, namely the phase A or phase B or phase C current of a current transformer TA1 of the circuit breaker 1DL is not less than a setting value, or the negative sequence current of TA1 is not less than a setting value, or the zero sequence current 3Io of TA1 is not less than a setting value;

when the above conditions are satisfied, the breaker protection of the breaker 1 DL:

(1) the delay t1 is connected with an outlet relay 1BCJ1(3LP1 pressing plate input) or an outlet relay contact 1BCJ2(3LP2 pressing plate input), a remote tripping loop of a 220kV transformer substation 220kV line L1 protection 1 or a remote tripping loop of a line L1 protection 2 is connected, an optical fiber channel of the protection 1 or the protection 2 is protected through a line L1, a tripping loop of the 220kV line L1 for the side protection 1 or the side protection 2 is started, and a line breaker 4DL of the power source side transformer substation 1 is tripped.

(2) The time delay t2 is connected with an outlet relay contact 1BCJ3(3LP3 pressing plate is switched in) or an outlet relay 1BCJ4(3LP4 pressing plate is switched in), and the failure combined tripping loops of the No. 1 transformer protection 1 and the No. 2 transformer protection of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of the No. 1 transformer protection 1 or a failure joint tripping loop of the No. 1 transformer protection 2 of the 220kV transformer substation is judged to be 1 or 2 through the No. 1 transformer current, the No. 1 transformer outlet relay is started to trip circuit breakers on all sides of the No. 1 transformer (namely a No. 1 transformer high-voltage side circuit breaker 1DL, a medium-voltage side circuit breaker 6DL and a low-voltage side circuit breaker 8DL) through 50ms delay, and the fault is removed.

3.2 breaker 2DL failure

When the circuit breaker 2DL fails, an open signal is provided for a corresponding protection trip contact open-in interface of a circuit breaker protection device of the circuit breaker 2DL, namely an electrical quantity protection 1 outlet trip relay contact 2CKJ1(2LP1 pressing plate input) of a No. 2 transformer or an electrical quantity protection 2 outlet trip relay contact 2CKJ2(2LP2 pressing plate input) of the No. 2 transformer is in an action state; meanwhile, the circuit breaker protection current discrimination function of the circuit breaker 2DL is started, namely the phase A or phase B or phase C current of a current transformer TA2 of the circuit breaker 2DL is not less than a setting value, or the negative sequence current of TA2 is not less than a setting value, or the zero sequence current 3Io of TA2 is not less than a setting value;

when the above conditions are satisfied, the breaker protection of the breaker 2 DL:

(1) the delay t1 is connected with an outlet relay contact 2BCJ1(4LP1 pressing plate input) or an outlet relay contact 4BCJ2(4LP2 pressing plate input), a remote tripping circuit of a 220kV transformer substation 220kV line L2 protection 1 or a remote tripping circuit of a line L2 protection 2 is connected, a fiber channel of the protection 1 or the protection 2 is protected through a line L1, a tripping circuit of the 220kV line L2 for the side protection 1 or the side protection 2 is started, and a line breaker 5DL of the power source side transformer substation 2 is tripped.

(2) The time delay t2 is connected with an outlet relay contact 2BCJ3(4LP3 pressing plate is switched in) or an outlet relay contact 2BCJ4(4LP4 pressing plate is switched in), and the failure joint tripping loops of the No. 2 transformer protection 1 and the No. 2 transformer protection 2 of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of No. 2 transformer protection 1 or a failure joint tripping loop of No. 2 transformer protection of a 220kV transformer substation is judged to be 1 or 2 through No. 2 transformer current, a circuit breaker on each side of No. 2 transformer (namely a high-voltage side circuit breaker 2DL, a medium-voltage side circuit breaker 7DL and a low-voltage side circuit breaker 9DL of the No. 2 transformer) is started to trip a circuit breaker on each side of the No. 2 transformer through 50ms delay, and the fault is removed.

3.3 internal bridge Circuit breaker 3DL and TA3 between Fault occurrences

When a fault occurs between the inner bridge circuit breakers 3DL and TA3, the fault is in the differential protection range of the No. 1 transformer protection 1 and the No. 2 transformer protection 1, the differential protection of the No. 1 transformer protection 2 acts immediately, and the three-side circuit breakers (including 1DL, 6DL and 8DL) of the No. 1 transformer are tripped open, even if so, the fault point still exists. Because the fault point is positioned outside the range of the differential current transformers of the No. 2 transformer protection 1 and the No. 2 protection 2, the differential protection of the No. 2 transformer protection 1 and the No. 2 protection 2 cannot act; however, as the fault point still exists, the differential protection of the 1 st transformer protection 1 and the 2 st protection is not returned all the time, that is, the circuit breaker protection device of the inner bridge circuit breaker 3DL has an open signal corresponding to the open interface of the protection trip contact, that is, the 1 st transformer electric quantity protection 1 outlet trip relay 1CKJ3(1LP3 pressing plate is put into) or the 1 st transformer electric quantity protection 2 outlet trip relay 1CKJ4(1LP4 pressing plate is put into) is in an action state; meanwhile, the circuit breaker protection current discrimination function of the inner bridge circuit breaker 3DL is started, namely the A-phase or B-phase or C-phase current of a current transformer TA3 of the 220kV inner bridge circuit breaker 3DL is not less than a setting value, or the negative sequence current of TA3 is not less than a setting value, or the zero sequence current 3Io of TA3 is not less than a setting value;

(1) the time delay t3 is connected with an outlet relay contact 3BCJ1(5LP1 pressing plate is switched in) or an outlet relay contact 3BCJ2(5LP2 pressing plate is switched in), and the failure joint tripping loops of the No. 1 transformer protection 1 and the No. 2 transformer protection of the 220kV transformer substation are respectively connected; after the current of the transformer 1 is judged to be 1 or the current of the transformer 1 is judged to be 2, the circuit breaker at each side of the transformer 1 (namely, an inner bridge circuit breaker 3DL, a high-voltage side circuit breaker 1DL of the transformer 1, a medium-voltage side circuit breaker 6DL and a low-voltage side circuit breaker 8DL) is started through 50ms delay after the current of the transformer 1 is judged to be 1 or the current of the transformer 1 is judged to be 2, and the differential protection of the transformer 1 and the transformer 2 is already operated to jump off the circuit breakers 1DL, 6DL and 8DL when a fault occurs, so that the circuit breaker protection of the inner bridge circuit breaker 3DL operates the idle trip circuit breakers 1DL, 6DL and 8 DL.

(2) The delay t4 starts an outlet relay 3BCJ3(5LP3 pressing plate is put into) or an outlet relay 3BCJ4(5LP4 pressing plate is put into), and the failure joint tripping loops of the No. 2 transformer protection 1 and the No. 2 transformer protection 2 of the 220kV transformer substation are respectively connected; after a failure joint tripping loop of the No. 2 transformer protection 1 or a failure joint tripping loop of the No. 2 transformer protection 2 of the 220kV transformer substation is judged to be 1 or 2 through the No. 2 transformer current, the circuit breaker at each side of the No. 2 transformer (namely an inner bridge circuit breaker 3DL, a middle voltage side circuit breaker 7DL and a low voltage side circuit breaker 9DL) is started through 50ms delay, and the fault is removed;

In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.

Claims

1. A220 kV inner bridge connection transformer substation circuit breaker failure relay protection method is characterized by comprising the following steps:

first, control process of breaker 1DL failure protection

1.1 Circuit breaker 1DL Circuit breaker failure functional logic

1.2 Circuit breaker 1DL failure protection Start Condition

1.3 Circuit breaker 1DL Circuit breaker Outlet trip

second, control procedure for 2DL failure protection of circuit breaker

2.1 Circuit breaker 2DL Circuit breaker failure functional logic

2.2 breaker 2DL failure protection start condition:

2.3 Circuit breaker 2DL Circuit breaker Outlet trip

control process for failure of inner bridge circuit breaker

3.1 inner bridge breaker 3DL breaker failure function logic

3.2 internal bridge circuit breaker 3DL failure protection starting condition:

3.3 inner bridge Circuit breaker 3 DL's breaker protection outlet trip

(2) the corresponding protection tripping contact is opened into the interface:

2. The 220kV internal bridging substation circuit breaker failure relay protection method of claim 1, wherein the electrical quantity protection of the No. 1 transformer comprises: differential protection of a No. 1 transformer, backup protection at 220kV side and other protection; other protections comprise a 110kV side backup protection of the No. 1 transformer or a 35kV side or 10kV side backup protection combined tripping transformer high-voltage side 1DL or 3DL circuit breaker; if the No. 1 transformer is a three-winding transformer, other protection also comprises transformer neutral point gap protection: gap zero-sequence current protection and gap zero-sequence voltage protection;

3. The 220kV inter-bridging substation breaker failure relay protection method of claim 1, wherein 220kV line L1 protection comprises: the method comprises the following steps of (1) line optical fiber current differential protection, interphase distance protection, grounding distance protection and direction zero sequence protection; the protection of the 220kV line L2 comprises the following steps: the method comprises the steps of line optical fiber current differential protection, interphase distance protection, grounding distance protection and direction zero sequence protection.

4. The 220kV inter-bridging substation breaker failure relay protection method of claim 1, wherein t1 is 150 milliseconds; t2 takes 150 milliseconds; t3, t4 take 150 milliseconds.

5. The 220kV inner bridge connection substation breaker failure relay protection method according to claim 1, wherein in the breaker protection device of the breaker 1DL, the breaker protection device of the breaker 2DL, the breaker protection device of the inner bridge breaker 3DL, and the transformer protection device No. 1 or the transformer protection device No. 2, the method for judging whether the A phase, the B phase or the C phase of the circuit breakers 1DL, 2DL and the inner bridge breaker 3DL have current is to collect the current of the current transformers TA1, TA2 and TA3 of the 220kV circuit breakers 1DL, 2DL and the inner bridge breaker 3DL respectively, and judge whether there is fault current by phase current or negative sequence current or zero sequence current; the setting requirements of phase current, negative sequence current and zero sequence current are as follows:

6. The 220kV inter-bridging substation breaker failure relay protection method of claim 1, wherein the protection configuration requirements of the 220kV line L1 and the line L2 are as follows: when the line breakers 1DL and 2DL are failed, the 4DL and 5DL breakers of the opposite-side substation are required to be tripped through the remote tripping function of the optical fiber current differential protection of the line L1 and the line L2, so the 220kV line L1 and the line L2 need to be provided with the optical fiber current differential protection, and the local-side protection remote starting tripping function is provided for the 5DL breakers of the 4DL and 220kV substations 2 of the opposite-side 220kV substation 1.