CN115986736A - Electric main wiring circuit with three bus bars mixed, its use method and power supply method - Google Patents

Abstract

The electrical main wiring circuit with three busbars mixed and its use method and power supply method of the present invention relate to the technical field of high-voltage power supply. By adding the third busbar, when the main line is powered by dual power supplies by the first busbar and the second busbar, maintenance needs to be carried out When using the isolation switch and the circuit breaker to cooperate flexibly, use the third busbar and one of the first busbar and the second busbar to provide dual power supply for the substation on the user side, so as to solve the problem of low power supply continuity in the prior art , the present invention is suitable for high-voltage substations or switching stations.

Description

Electric main wiring circuit with three bus bars mixed, its use method and power supply method

technical field

The invention relates to the technical field of high-voltage power supply, in particular to a three-bus mixed electrical main wiring circuit, its use method and power supply method.

Background technique

110kV or 220kV and other high-voltage switching stations or substations, when there are many incoming and outgoing lines, and a single single busbar segment or double busbar or double busbar segmented electrical main wiring method is used, the circuit breaker for a certain incoming and outgoing line circuit If the device is overhauled, the power supply of the corresponding circuit will be interrupted, and the continuity of power supply will be reduced.

Contents of the invention

The technical problem solved by the present invention: the present invention provides a three-bus mixed electrical main wiring circuit and its use method and power supply method, which solves the problem of low power supply continuity in the prior art.

The technical solution adopted by the present invention to solve the above-mentioned technical problems: a three-bus mixed electrical main wiring circuit is used to supply power to the user-side substation, and the user-side substation includes a first power supply line and a second power supply line, including the first bus bar, the second power supply line Second busbar, third busbar, first isolating switch, second isolating switch, third isolating switch, fourth isolating switch, fifth isolating switch, sixth isolating switch, seventh isolating switch, eighth isolating switch, ninth isolating switch a switch, a first circuit breaker, a second circuit breaker, a third circuit breaker, a first current transformer, a second current transformer, and a third current transformer;

The first bus bar is connected to the first power supply line through the first isolating switch, the first circuit breaker, the first current transformer, and the second isolating switch in sequence; the first bus bar also passes through the seventh isolating switch, the third circuit breaker in sequence The device, the third current transformer, and the ninth isolating switch are connected to the third bus bar;

The second busbar is connected to the second power supply line through the fourth disconnector, the second circuit breaker, the second current transformer and the fifth disconnector in sequence; the second busbar is connected to the third circuit breaker through the eighth disconnector in turn. device connected;

The third bus bar is connected to the first power supply line through three isolation switches, and is also connected to the second power supply line through the sixth isolation switch;

The user-side substation provides dual power supply through any two of the first bus, the second bus and the third bus.

Further, the electrical main wiring circuit of the three-bus hybrid also includes a connection circuit between the first bus and the second bus and at least one power supply circuit for supplying power to the first bus or the second bus;

The connection circuit between the first bus bar and the second bus bar includes a tenth isolating switch, an eleventh isolating switch, a fourth circuit breaker and a fourth current transformer; the first bus bar passes through the tenth isolating switch, the fourth circuit breaker The device, the fourth current transformer, and the eleventh isolating switch are connected to the second bus bar;

The power supply circuit for the first busbar or the second busbar includes a power station on the power supply side, a twelfth isolating switch, a thirteenth isolating switch, a fourteenth isolating switch, a fifth circuit breaker, and a fifth current transformer; After passing through the twelfth isolating switch, the fifth current transformer and the fifth circuit breaker in sequence, the power station on the power supply side supplies power to the first bus through the thirteenth isolating switch or supplies power to the second bus through the fourteenth isolating switch.

Further, the electrical main wiring circuit of the three-bus hybrid also includes a plurality of grounding blades, and the grounding blades are used to implement the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker, the fifth circuit breaker, the fourth circuit breaker Both ends of a current transformer, the second current transformer, the third current transformer, the fourth current transformer and the fifth current transformer are grounded, and the power station, the first power supply line and the second power supply line are grounded.

How to use the electrical main wiring circuit with three busbars mixed:

Under normal circumstances: the first power supply line is powered by the first bus bar, that is, the first isolating switch, the first circuit breaker and the second isolating switch are closed, the third isolating switch is opened, and the second power supply line is powered by the second bus bar. That is, close the fourth isolating switch, the second circuit breaker and the fifth isolating switch, open the sixth isolating switch, and open the remaining isolating switches and circuit breakers;

When it is necessary to overhaul the first busbar, the first circuit breaker or the first current transformer, the second busbar supplies power to the third busbar, and the third busbar supplies power to the first power supply line, that is, close the eighth isolating switch, the third The circuit breaker, the ninth isolating switch and the third isolating switch are powered by the second busbar for the second power supply line, that is, the fourth isolating switch, the second circuit breaker and the fifth isolating switch are closed, the sixth isolating switch is opened, and the rest are isolated Both the switch and the circuit breaker are open;

When it is necessary to overhaul the second busbar, the second circuit breaker or the second current transformer, the first busbar supplies power to the first power supply line, that is, the first isolating switch, the first circuit breaker and the second isolating switch are closed, and the Open the third isolating switch, supply power to the third bus from the first bus, that is, close the seventh isolating switch, the third circuit breaker, the ninth isolating switch and the third isolating switch, and the third bus supplies power to the second power supply line, namely The sixth isolating switch is closed, and the remaining isolating switches and circuit breakers are all disconnected.

The power supply method of the electrical main wiring circuit with three busbars mixed, including power supply for the first busbar by the power station on the power supply side and power supply for the second busbar by the power station on the power supply side,

When the power station on the power side supplies power to the first busbar, close the twelfth isolating switch, the fifth circuit breaker and the thirteenth isolating switch, and open the fourteenth isolating switch;

When the power station on the power side supplies power to the second busbar, close the twelfth isolating switch, the fifth circuit breaker and the fourteenth isolating switch, and open the thirteenth isolating switch;

When there are multiple power supply circuits supplying power to the first bus bar or the second bus bar, the tenth isolating switch, the eleventh isolating switch and the fourth circuit breaker are closed.

Beneficial effects of the present invention: the electric main wiring circuit with three busbars mixed in the present invention and its use method and power supply method need to be overhauled when the main line is powered by dual power supplies by the first busbar and the second busbar by adding the third busbar When using the isolation switch and the circuit breaker to cooperate flexibly, one of the third busbar and the first busbar and the second busbar is used to provide dual power supply for the substation on the user side, so as to solve the problem of low power supply continuity in the prior art .

Description of drawings

Accompanying drawing 1 is the structure schematic diagram of the electrical main connection circuit of three bus bars hybrid of the present invention.

Accompanying drawing 2 is the schematic diagram of the connection circuit and the power supply circuit of the electrical main connection circuit of the three-bus hybrid of the present invention.

Detailed ways

The electrical main wiring circuit with three busbars mixed in the present invention, as shown in Figure 1, is used to supply power to the user-side substation. The user-side substation includes a first power supply line OUT1 and a second power supply line OUT2, including a first busbar X, Second bus bar Y, third bus bar Z, first isolating switch 11, second isolating switch 12, third isolating switch 13, fourth isolating switch 21, fifth isolating switch 22, sixth isolating switch 23, seventh isolating switch 31. The eighth isolating switch 32, the ninth isolating switch 33, the first circuit breaker 1, the second circuit breaker 2, the third circuit breaker 3, the first current transformer 14, the second current transformer 24 and the third current transformer device 34;

The first bus X is connected to the first power supply line OUT1 sequentially through the first isolating switch 11, the first circuit breaker 1, the first current transformer 14, and the second isolating switch 12; The seventh isolating switch 31, the third circuit breaker 3, the third current transformer 34, and the ninth isolating switch 33 are connected to the third bus Z;

The second bus Y is connected to the second power supply line OUT2 through the fourth isolating switch 21, the second circuit breaker 2, the second current transformer 24, and the fifth isolating switch 22 in sequence; Eight isolating switches 32 are connected with the third circuit breaker 3;

The third bus Z is connected to the first power supply line OUT1 through the three isolating switches 13, and is also connected to the second power supply line OUT2 through the sixth isolating switch 23;

The user-side substation provides dual power supply through any two of the first bus X, the second bus Y and the third bus Z.

Further, the electrical main wiring circuit of the three-bus hybrid also includes a connection circuit between the first bus X and the second bus Y and at least one power supply circuit for supplying power to the first bus X or the second bus Y, as shown in Figure 2,

The connecting circuit of the first bus X and the second bus Y includes a tenth isolating switch 41, an eleventh isolating switch 42, a fourth circuit breaker 4 and a fourth current transformer 43; Ten isolating switch 41, the fourth circuit breaker 4, the fourth current transformer 43, the eleventh isolating switch 42 are connected to the second bus Y;

The power supply circuit for supplying power to the first busbar X or the second busbar Y includes a power station on the power supply side, a twelfth isolating switch 51, a thirteenth isolating switch 52, a fourteenth isolating switch 53, a fifth circuit breaker 5, a fifth A current transformer 54; the power station on the power side passes through the twelfth isolating switch 51, the fifth current transformer 54 and the fifth circuit breaker 5 in turn, and supplies power to the first bus X through the thirteenth isolating switch 52 or through the tenth Four isolation switches 53 supply power to the second bus Y.

Further, the electrical main wiring circuit of the three-bus hybrid also includes a plurality of grounding blades, and the grounding blades are used to realize the first circuit breaker 14, the second circuit breaker 2, the third circuit breaker 3, the fourth circuit breaker 4, and the fifth circuit breaker. Both ends of the circuit breaker 5, the first current transformer 14, the second current transformer 24, the third current transformer 34, the fourth current transformer 43, and the fifth current transformer 54 are grounded, and to the power supply side power station, the second current transformer The first power supply line OUT1 and the second power supply line OUT2 are grounded.

The method of using the electric main wiring circuit with three busbars mixed in the present invention:

Under normal circumstances: the first power supply line OUT1 is powered by the first bus X, that is, the first isolating switch 11, the first circuit breaker 1 and the second isolating switch 12 are closed, the third isolating switch 13 is opened, and the second bus Y Supply power to the second power supply line OUT2, that is, close the fourth isolating switch 21, the second circuit breaker 2 and the fifth isolating switch 22, open the sixth isolating switch 23, and open the remaining isolating switches and circuit breakers;

When it is necessary to overhaul the first bus X, the first circuit breaker 1 or the first current transformer 14, the second bus Y supplies power to the third bus Z, and the third bus Z supplies power to the first power supply line OUT1, that is, it is closed The eighth isolating switch 32, the third circuit breaker 3, the ninth isolating switch 33 and the third isolating switch 13 are powered by the second bus Y to the second power supply line OUT2, that is, the fourth isolating switch 21 and the second circuit breaker 2 are closed. and the fifth isolating switch 22, disconnect the sixth isolating switch 23, and all the other isolating switches and circuit breakers are disconnected;

When it is necessary to overhaul the second bus Y, the second circuit breaker 2 or the second current transformer 24, the first power supply line OUT1 is powered by the first bus X, that is, the first isolating switch 11 and the first circuit breaker 1 are closed. and the second isolating switch 12, open the third isolating switch 13, supply power for the third bus Z by the first bus X, that is, close the seventh isolating switch 31, the third circuit breaker 3, the ninth isolating switch 33 and the third The isolating switch 13 and the third bus Z supply power to the second power supply line OUT2, that is, the sixth isolating switch 23 is closed, and the other isolating switches and circuit breakers are all turned off.

The power supply method of the electric main wiring circuit with three busbars mixed in the present invention comprises that the power station on the power supply side supplies power to the first busbar X and the power station on the power supply side supplies power to the second busbar Y,

When the power station on the power side supplies power to the first bus X, close the twelfth isolating switch 51, the fifth circuit breaker 5 and the thirteenth isolating switch 52, and open the fourteenth isolating switch 53;

When the power station on the power supply side supplies power to the second bus bar Y, close the twelfth isolating switch 51, the fifth circuit breaker 5 and the fourteenth isolating switch 53, and open the thirteenth isolating switch 52;

When there are multiple power supply circuits supplying power to the first bus X or the second bus Y, the tenth isolating switch 41 , the eleventh isolating switch 42 and the fourth circuit breaker 4 are closed.

In the present invention, according to the maintenance situation, it is possible to rationally allocate the power station on the power supply side to supply power to which of the first bus and the second bus, and cooperate with the third bus to realize dual power supply for the user-side substation, thereby solving the problem of The issue of not being able to sustain dual power supplies.

For multiple user-side substations, it is only necessary to connect multiple user-side substations according to the connection mode between the user-side substations and the first bus, the second bus and the third bus in this application. For each user-side substation, Both can achieve separate power failure and continuous dual power supply.

Claims (5)

1. The electric main connection circuit of three bus bars mixed, is used for supplying power to the substation on the user side, and the substation on the user side includes a first power supply line (OUT1) and a second power supply line (OUT2), which is characterized in that the first bus bar ( X), the second busbar (Y), the third busbar (Z), the first isolating switch (11), the second isolating switch (12), the third isolating switch (13), the fourth isolating switch (21), the The fifth isolating switch (22), the sixth isolating switch (23), the seventh isolating switch (31), the eighth isolating switch (32), the ninth isolating switch (33), the first circuit breaker (1), the second circuit breaker device (2), the third circuit breaker (3), the first current transformer (14), the second current transformer (24) and the third current transformer (34); The first busbar (X) sequentially passes through the first isolating switch (11), the first circuit breaker (1), the first current transformer (14), the second isolating switch (12) and the first power supply line (OUT1) connected; the first busbar (X) also passes through the seventh disconnector (31), the third circuit breaker (3), the third current transformer (34), the ninth disconnector (33) and the third busbar ( Z) connected; The second busbar (Y) sequentially passes through the fourth isolation switch (21), the second circuit breaker (2), the second current transformer (24), the fifth isolation switch (22) and the second power supply line (OUT2) connected; the second busbar (Y) is also connected to the third circuit breaker (3) through the eighth isolating switch (32) in sequence; The third bus bar (Z) is connected to the first power supply line (OUT1) through three isolating switches (13), and is also connected to the second power supply line (OUT2) through a sixth isolating switch (23); The user side substation provides dual power supply through any two of the first bus (X), the second bus (Y) and the third bus (Z). 2. The electrical main connection circuit of three busbars mixing according to claim 1, characterized in that, it also includes a connection circuit between the first busbar (X) and the second busbar (Y) and at least one is the first busbar (X) Or the power supply circuit powered by the second bus bar (Y); The connecting circuit of the first busbar (X) and the second busbar (Y) includes a tenth isolating switch (41), an eleventh isolating switch (42), a fourth circuit breaker (4) and a fourth current transformer ( 43); the first busbar (X) passes through the tenth isolating switch (41), the fourth circuit breaker (4), the fourth current transformer (43), the eleventh isolating switch (42) and the second busbar in sequence (Y) connected; The power supply circuit for supplying power to the first busbar (X) or the second busbar (Y) includes a power station on the power supply side, a twelfth isolating switch (51), a thirteenth isolating switch (52), a fourteenth isolating switch (53 ), the fifth circuit breaker (5), the fifth current transformer (54); ), supply power to the first busbar (X) through the thirteenth isolating switch (52) or supply power to the second busbar (Y) through the fourteenth isolating switch (53). 3. the electrical main connection circuit of three bus bars mixing according to claim 2, is characterized in that, also comprises a plurality of grounding blades, and described grounding blade is installed in the first current transformer (14), the second current transformer ( 24), the two ends of the fourth current transformer (43) and the fifth current transformer (54), as well as the first power supply line (OUT1), the second power supply line (OUT2) and the power supply side power station. 4. The method for using the electrical main wiring circuit of the three-bus mixing is applied to the electrical main wiring circuit of the three-bus mixing according to claim 1, characterized in that, Under normal circumstances: the first power supply line (OUT1) is powered by the first busbar (X), that is, the first isolating switch (11), the first circuit breaker (1) and the second isolating switch (12) are closed, and the second isolating switch (12) is opened. Three isolating switches (13), the second power supply line (OUT2) is powered by the second bus bar (Y), that is, the fourth isolating switch (21), the second circuit breaker (2) and the fifth isolating switch (22) are closed, Disconnect the sixth isolating switch (23), and all the other isolating switches and circuit breakers are disconnected; When it is necessary to overhaul the first busbar (X), the first circuit breaker (1) or the first current transformer (14), the second busbar (Y) supplies power to the third busbar (Z), and the third busbar ( Z) Supply power to the first power supply line (OUT1), that is, close the eighth isolating switch (32), the third circuit breaker (3), the ninth isolating switch (33) and the third isolating switch (13), and the second busbar (Y) supply power to the second power supply line (OUT2), that is, close the fourth isolating switch (21), the second circuit breaker (2) and the fifth isolating switch (22), open the sixth isolating switch (23), and the rest Both the isolating switch and the circuit breaker are disconnected; When it is necessary to overhaul the second busbar (Y), the second circuit breaker (2) or the second current transformer (24), the first power supply line (OUT1) is powered by the first busbar (X), that is, the first power supply line (OUT1) is closed. An isolating switch (11), the first circuit breaker (1) and the second isolating switch (12), disconnect the third isolating switch (13), and supply power to the third bus (Z) from the first bus (X), That is, closing the seventh isolating switch (31), the third circuit breaker (3), the ninth isolating switch (33) and the third isolating switch (13), the third bus bar (Z) supplies power to the second power supply line (OUT2), That is, the sixth isolating switch (23) is closed, and all the other isolating switches and circuit breakers are disconnected. 5. The power supply method of the mixed electric main wiring circuit of three busbars, which is applied to the electric main wiring circuit of three busbars mixed in claim 2 or 3, is characterized in that, comprising power supply for the first busbar (X) by the power station on the power supply side and the power station on the power side supply power to the second busbar (Y), When the power station on the power supply side supplies power to the first busbar (X), close the twelfth isolating switch (51), the fifth circuit breaker (5) and the thirteenth isolating switch (52), and open the fourteenth isolating switch (53 ); When the power station on the power supply side supplies power to the second busbar (Y), close the twelfth isolating switch (51), the fifth circuit breaker (5) and the fourteenth isolating switch (53), and open the thirteenth isolating switch (52 ); When there are multiple power supply circuits supplying power to the first busbar (X) or the second busbar (Y), the tenth isolating switch (41), the eleventh isolating switch (42) and the fourth circuit breaker (4) are closed.

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