CN106786405B - It can prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation - Google Patents

It can prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation Download PDF

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Publication number
CN106786405B
CN106786405B CN201611123783.8A CN201611123783A CN106786405B CN 106786405 B CN106786405 B CN 106786405B CN 201611123783 A CN201611123783 A CN 201611123783A CN 106786405 B CN106786405 B CN 106786405B
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China
Prior art keywords
main transformer
gate circuit
output end
breaker
differential protection
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CN201611123783.8A
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CN106786405A (en
Inventor
宁景云
郭冰
陈钊
宁宁
宁一
谢丹
王小朋
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • H02H7/045Differential protection of transformers
    • H02H7/0455Differential protection of transformers taking into account saturation of current transformers

Abstract

It is a kind of to prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation.It includes the line disconnected in bridging line differential protection circuit between the first gate circuit A1 input terminal and the second gate circuit A2 output end P1;The latch-up protection circuit for being controlled by contact 3B1 is added between the first gate circuit A1 input terminal and the second gate circuit A2 output end P1.It is provided by the invention to prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation from having the following effects that;Simple possible, effect is obvious, can fundamentally solve the generation of substation's full cut-off accident, while will not generate any influence to the correct movement of protective relaying device under the various methods of operation being likely to occur.

Description

It can prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation
Technical field
The invention belongs to power line protection technical fields, can prevent more particularly to one kind dead in bridging line substation The method that area's short circuit causes whole station to have a power failure.
Background technique
It is more general using Gratz connection mode in the substation of electric system 220kV, 110kV and 35kV voltage class Time.But if bridge breaker casing without included current transformer, but uses outer attached current transformer, then in current transformer It is known as dead-zone fault to the failure occurred on this section of bus between bridge breaker.Existing differential protection can not carry out effectively Protection, to cause whole station power outage, this problem there is no effective solution method so far.
Fig. 1 is existing bridging line differential protection circuit diagram.1L, 2L are two-way electric power incoming line, 1T, 2T #1, # in figure 2 main transformers, 1B, 2B are line power breaker, and 3B is the bridge breaker of high-voltage side bus, and 4B, 5B are main transformer low voltage Side outlet breaker, 6B are the bridge breaker of low-pressure side bus.1CT, 2CT, 3CT are #1 main transformer differential protection Current Mutual Inductance Device, 1P, 2P #1, #2 main transformer differential protection relay.
Fig. 2 is #1 main transformer differential protection loop wiring diagram in prior art, wherein the first gate circuit A1 is and logic Circuit, three input terminals respectively with " certain mutually differential element movement " output end, " certain mutually shove differentiation movement " output end, " CT is disconnected Line movement " output end is connected, and output end is #1 main transformer differential protection action signal output end.
Under normal operating mode, bridge breaker 3B is in open position, two main transformer fanout operations.When in bridge When short trouble occurring at the K between breaker 3B and outer attached current transformer 2CT, fault point is in the differential guarantor of #2 main transformer Except the protection scope of protection unit, but within the protection scope of #1 main transformer differential protection, therefore #2 main transformer Differential protection relay 2P will not be acted, and #1 main transformer differential protection relay 1P act, excision #1 main transformer 1B and Breaker 4B, (#1 main transformer differential circuit electric current enters in figure at current transformer 2CT, in figure high-pressure side I sections of bus power loss Shown in arrow).Since fault point is located at II sections of buses, after the movement of #1 main transformer differential protection, fault point is still In the presence of fault current will lean on the movement of #2 main transformer time limit overcurrent protective relaying device to cut off.2L line power breaker 2B After tripping, high-pressure side II sections of bus power loss has resulted in whole station power failure although fault point is removed.
From the analysis of entire accident process, it can be seen that the movement of #1 main transformer differential protection is theoretically correct , but be bad from effect, because fault point is not eliminated, and cause whole station power outage.If #1 master Transformer does not trip, after short trouble depends on #2 main transformer overcurrent tripping power circuit breaker 2B, breaker 5B, low-pressure side bus Bridge breaker 6B standby self-closing, II sections of bus loads of low-pressure side turn to be powered by #1 main transformer, then whole station load is not by accident shadow It rings.
In this accident, such as why not allowing the movement of #1 main transformer differential protection is that current this field is badly in need of wanting It solves the problems, such as.
Summary of the invention
To solve the above-mentioned problems, the purpose of the present invention is to provide one kind, and dead zone in bridging line substation can be prevented short The method that road causes whole station to have a power failure.
In order to achieve the above object, provided by the invention to prevent dead zone short circuit in bridging line substation from whole station being caused to stop The method of electricity includes the following steps carried out in order:
Step 1) disconnects the first gate circuit A1 input terminal and the second gate circuit A2 output end in bridging line differential protection circuit Line between P1;
Step 2) is added between the first gate circuit A1 input terminal and the second gate circuit A2 output end P1 is controlled by contact 3B1 Latch-up protection circuit connect the connection between the first gate circuit A1 output end and the second gate circuit A2 when contact 3B1 closure, I.e. the first gate circuit A1 output signal is effective;When contact 3B1 is disconnected, the first gate circuit A1 output end and the second gate circuit A2 are cut off Between connection, i.e. the first gate circuit A1 output signal is invalid.
In step 2), the latch-up protection circuit includes: third gate circuit A3, the 4th gate circuit A4, photoelectric coupling Device A5, first resistor device R1, second resistor R2 and light emitting diode D1, in which:
The output end of third gate circuit A3 is connected with the input terminal P1 of the second gate circuit A2, and one of third gate circuit A3 Input terminal connect with the first gate circuit A1 output end, the output of another input terminal of third gate circuit A3 and the 4th gate circuit A4 End connection, the input terminal of the 4th gate circuit A4 are connected with the output end P of photoelectrical coupler A5, the positive input of photoelectrical coupler A5 End passes sequentially through first resistor device R1 and contact 3B and connect with the end power supply+220V, the negative input end and power supply-of photoelectrical coupler A5 The connection of the end 220V, one end of second resistor R2 connect with the end power supply+5V, the output end P phase of the other end and photoelectrical coupler A5 Connection, the anode of light emitting diode D1 connect with the negative input end of photoelectrical coupler A5, its cathode with photoelectrical coupler A5 just Input terminal connection.
The contact 3B1 is the auxiliary normally closed contact of bridge breaker 3B.
It is provided by the invention to prevent dead zone short circuit in bridging line substation from causing the method for whole station power failure with as follows Effect;Simple possible, effect is obvious, can fundamentally solve the generation of substation's full cut-off accident, while being likely to occur to various The method of operation under protective relaying device it is correct movement will not generate any influence.
Detailed description of the invention
Fig. 1 is existing bridging line differential protection circuit diagram.
Fig. 2 is #1 main transformer differential protection loop wiring diagram in prior art;
Fig. 3 can prevent #1 in the method that dead zone short circuit causes whole station to have a power failure in bridging line substation to be provided by the invention Main transformer protection circuit wiring diagram.
Specific embodiment
Dead zone short circuit in bridging line substation can be prevented to provided by the invention in the following with reference to the drawings and specific embodiments The method for causing whole station to have a power failure is described in detail.
As shown in figure 3, provided by the invention can prevent the side that dead zone short circuit causes whole station to have a power failure in bridging line substation Method includes the following steps carried out in order:
Step 1) disconnects the first gate circuit A1 input terminal and the second gate circuit A2 output end in bridging line differential protection circuit Line between P1;
Step 2) is added between the first gate circuit A1 input terminal and the second gate circuit A2 output end P1 is controlled by contact 3B1 Latch-up protection circuit connect the connection between the first gate circuit A1 output end and the second gate circuit A2 when contact 3B1 closure, I.e. the first gate circuit A1 output signal is effective;When contact 3B1 is disconnected, the first gate circuit A1 output end and the second gate circuit A2 are cut off Between connection, i.e. the first gate circuit A1 output signal is invalid.
In step 2), the latch-up protection circuit includes: third gate circuit A3, the 4th gate circuit A4, photoelectric coupling Device A5, first resistor device R1, second resistor R2 and light emitting diode D1, in which:
The output end of third gate circuit A3 is connected with the input terminal P1 of the second gate circuit A2, and one of third gate circuit A3 Input terminal connect with the first gate circuit A1 output end, the output of another input terminal of third gate circuit A3 and the 4th gate circuit A4 End connection, the input terminal of the 4th gate circuit A4 are connected with the output end P of photoelectrical coupler A5, the positive input of photoelectrical coupler A5 End passes sequentially through first resistor device R1 and contact 3B and connect with the end power supply+220V, the negative input end and power supply-of photoelectrical coupler A5 The connection of the end 220V, one end of second resistor R2 connect with the end power supply+5V, the output end P phase of the other end and photoelectrical coupler A5 Connection, the anode of light emitting diode D1 connect with the negative input end of photoelectrical coupler A5, its cathode with photoelectrical coupler A5 just Input terminal connection.
The first gate circuit A1 is and logic circuit, four input terminals are exported with " certain mutually differential element movement " respectively End, " certain differentiation movement of mutually shoving " output end, " movement of CT broken string " output end, the second gate circuit A2 output end are connected, and act on It is to judge whether to issue differential protection action signal.
The second gate circuit A2 is or logic circuit, two input terminal respectively with third gate circuit A3 output end, 4th gate circuit A4 output end is connected, and effect is the sending when #1 main transformer overcurrent protection acts or 3B bridge breaker is incorporated into Action signal.
The third gate circuit A3 is or logic circuit, effect are to issue to move when #1 main transformer overcurrent protection movement Make signal.
The 4th gate circuit A4 is signal conversion circuit, and effect is the voltage value conversion by P point under different conditions It is exported for output action signal or attonity signal.
As shown in Figure 1, the contact 3B1 is the auxiliary normally closed contact of bridge breaker 3B, effect is when 3B bridge breaker Disconnection when being incorporated into makes P point current potential become+5V.
As shown in Figure 1, Figure 3, left element is the overflow protecting element of #1 main transformer in dotted line frame in Fig. 3.The element Output signal and #1 main transformer differential protection output signal are the relationship of "AND", i.e. differential protection signal and overcurrent protection Signal, which is simultaneously emitted by, just can star protection exit.
When can be seen that the generation short trouble from K from the analysis to the above protection act process, #1 main transformer is differential Protective device should act, but because bridge breaker 3B is in an off state, power circuit breaker 1B does not provide short circuit to fault point Electric current, #1 main transformer overflow protecting element is simultaneously inactive, and the second gate circuit A2 does not have output action signal, differential protection element "AND" logical relation is formed with overcurrent protective device, the first gate circuit A1 is unsatisfactory for operation condition, can be effectively prevented #1 master Differential protective device of transformer movement.
If route 1L interruption maintenance, when by the two main transformer operations of route 2L band, because power circuit breaker 1B is It disconnects, #1 main transformer overcurrent protective device deactivates, if short trouble occurs at high-pressure side I sections of bus at this time, due to #1 Main transformer overflow protecting element and differential protection are "AND" relationship, then #1 main transformer differential protection can tripping. Such case occurs in order to prevent, the latch-up protection including the present invention addition one auxiliary normally closed contact including bridge breaker 3B Circuit.When route 1L interruption maintenance, bridge breaker 3B is incorporated into as high-pressure side I sections of bussed supply, and contact 3B1 is to disconnect shape State, light emitting diode D1 can not be grounded since power loss leads to latch-up protection circuit malfunction at this time, and P point becomes+5V high potential, the Four gate circuit A4 output action signals, the second gate circuit A2 meet operation condition, and output action signal is differential with #1 main transformer The "AND" logic that protective device is constituted is still effective, so as to prevent the tripping of #1 main transformer differential protection.
Under normal operating mode, since bridge breaker 3B is disconnected, contact 3B1 is to be incorporated into state, at this time light-emitting diodes Normal voltage is added in the both ends pipe D1, and latch-up protection circuit comes into force, and P point becomes 0 current potential of ground connection, and the 4th gate circuit A4 can not export Make signal, overflow protecting element will not accidentally send out action signal.
Therefore, the method for the present invention can guarantee under normal operating mode overcurrent protective device will not malfunction, when occur dead zone #1 main transformer differential protection can be made to be failure to actuate when short-circuit, again will not when route 1L is in the special method of operation of maintenance Make main transformer differential protection tripping.

Claims (1)

1. one kind can prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation, it is characterised in that: described Can prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation includes the following steps carried out in order:
Step 1) disconnect in bridging line differential protection circuit the first gate circuit A1 input terminal and the second gate circuit A2 output end P1 it Between line;
The bridging line differential protection circuit includes two-way electric power incoming line 1L, 2L;#1 main transformer 1T, #2 main transformer 2T; Line power breaker 1B, 2B;The bridge breaker 3B of high-voltage side bus;Main transformer low side outlets breaker 4B, 5B;Low pressure The bridge breaker 6B of side bus;#1 main transformer differential protection current transformer 1CT, 2CT, 3CT;#1, #2 main transformer are differential Protective relay 1P, 2P;#2 main transformer differential protection current transformer 4CT, 5CT, 6CT;Wherein, in primary side, line electricity Source breaker 1B, main transformer low side outlets breaker 4B are connect respectively in #1 main transformer 1T high and low pressure both ends, line power Breaker 2B, main transformer low side outlets breaker 5B are connect respectively in #2 main transformer 2T high and low pressure both ends, high-voltage side bus Bridge breaker 3B connect the bridge breaker in the high-pressure side main transformer 2T main transformer 1T, #2 #1 as high-voltage side bus, low pressure The bridge breaker 6B of side bus connects the bridge open circuit in #1 main transformer 1T, #2 main transformer 2T low-pressure side as low-pressure side bus Device;In secondary side, #1 main transformer differential protection current transformer 1CT is connected to line power breaker 1B and electric power incoming line 1L high Between pressing side inlet wire, #1 main transformer differential protection current transformer 2CT is connected to the bridge breaker 3B and #2 main transformer of high-voltage side bus Between the on high-tension side bridging line of depressor 2T, #1 main transformer differential protection current transformer 3CT is connected to main transformer low-pressure side and goes out Between low-voltage side outlet between mouth breaker 4B to 6B, #1 main transformer differential protection current transformer 1CT, 2CT, 3CT, #2 main transformer Depressor differential protection relay 1P concatenation is used as #1 main transformer 1T differential protection starting-up later time, #2 main transformer differential protection electricity Current transformer 4CT is connected between line power breaker 2B and electric power incoming line 2L high voltage side lead-in, #2 main transformer differential protection electricity Current transformer 5CT is connected between the on high-tension side bridging line of bridge breaker 3B and #2 main transformer 2T of high-voltage side bus, #2 main transformer Depressor differential protection current transformer 6CT is connected between the low-voltage side outlet between main transformer low side outlets breaker 5B to 6B, # 2 main transformer differential protection current transformer 4CT, 5CT, 6CT, #2 main transformer differential protection relay 2P concatenation is used as #2 master The differential protection starting-up later time of transformer 2T;
The first gate circuit A1 is and logic circuit, four input terminals respectively with " certain mutually differential element movement " output end, " certain differentiation movement of mutually shoving " output end, " movement of CT broken string " output end, the second gate circuit A2 output end are connected, and effect is to sentence It is disconnected whether to issue differential protection action signal;
The second gate circuit A2 is or logic circuit, two input terminal respectively with third gate circuit A3 output end, the 4th Gate circuit A4 output end is connected, and effect is the sending movement when #1 main transformer overcurrent protection acts or 3B bridge breaker is incorporated into Signal;
Step 2) is added between the first gate circuit A1 input terminal and the second gate circuit A2 output end P1 is controlled by closing for contact 3B1 Lock protection circuit connects the connection between the first gate circuit A1 output end and the second gate circuit A2 when contact 3B1 closure, i.e., and the One gate circuit A1 output signal is effective;When contact 3B1 is disconnected, cut off between the first gate circuit A1 output end and the second gate circuit A2 Connection, i.e., the first gate circuit A1 output signal is invalid;
The latch-up protection circuit includes: third gate circuit A3, the 4th gate circuit A4, photoelectrical coupler A5, first resistor device R1, second resistor R2 and light emitting diode D1, in which:
The output end of third gate circuit A3 is connected with the input terminal P1 of the second gate circuit A2, an input of third gate circuit A3 End connect with the first gate circuit A1 output end, the output end of another input terminal of third gate circuit A3 and the 4th gate circuit A4 company Connect, the input terminal of the 4th gate circuit A4 is connected with the output end P of photoelectrical coupler A5, the positive input terminal of photoelectrical coupler A5 according to It is secondary to be connect by first resistor device R1 and contact 3B with the end power supply+220V, the negative input end and power supply -220V of photoelectrical coupler A5 End connection, one end of second resistor R2 is connect with the end power supply+5V, the other end is connected with the output end P of photoelectrical coupler A5, The anode of light emitting diode D1 connect with the negative input end of photoelectrical coupler A5, the positive input terminal of its cathode and photoelectrical coupler A5 Connection;
The contact 3B1 is the auxiliary normally closed contact of bridge breaker 3B.
CN201611123783.8A 2016-12-08 2016-12-08 It can prevent the method that dead zone short circuit causes whole station to have a power failure in bridging line substation Active CN106786405B (en)

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