CN203312816U - Shunt reactor compensation circuit for substation - Google Patents

Abstract

The utility model discloses a shunt reactor compensation circuit for a substation. The compensation circuit comprises a non-load busbar which is connected with a first switch and a second switch by circuits. The first switch is connected with one end of a shunt reactor through a first cable, and the other end of the shunt reactor is three-phase short-circuited to be a neutral point. The shunt reactor is connected with a turn-to-turn lightning arrester in parallel. One end of the turn-to-turn lightning arrester is connected with a lightning arrester by circuits, and the other end of the lightning arrester is grounded. The second switch is connected with a capacitance-resistance absorber through a second cable by circuits, and the other end of the capacitance-resistance absorber is grounded. According to the shunt reactor compensation circuit provided by the utility model, the capacitance-resistance absorber is added on the side of the non-load busbar, and the reactor is connected with the turn-to-turn lightning arrester in parallel, so that the over-voltage on the busbar side and the load side during the switching of the shunt reactor can be reduced simultaneously, thereby protecting the safety of the shunt reactor equipment and system.

Description

A Shunt Reactor Compensation Circuit for Substation

technical field

The utility model relates to a compensation circuit, in particular to a compensation circuit for a shunt reactor in a substation.

Background technique

In order to adjust the voltage and reactive power, for the 220kV substation whose 110kV outgoing line is a cable, the current power grid generally configures shunt reactors on the 35kV side. type reactor, dry-type air-core reactor, etc.) are generally installed outdoors, and the switching equipment is connected to the shunt reactor through a long cable.

When the vacuum circuit breaker breaks and resists such small inductive loads, the first open phase will have different degrees of cut-off, which will cause overvoltage on the load side and cause re-ignition of the first open phase. Due to continuous re-ignition and inter-phase coupling, the second two phases will be equal Effective cut-off will cause more serious overvoltage on the load side, leading to and resisting faults such as inter-turn breakdown or even burning. If the system is an empty bus with no load, due to the small capacitance of the bus side to the ground, the bus side will oscillate and cause serious overvoltage, which will cause damage to the transformer on the bus side or blown high-voltage fuses, and blown high-voltage fuses on the busbar side , or even direct short-circuit of the busbar and other faults seriously affect the normal operation and system safety of the 35kV parallel resistance.

Utility model content

In order to solve the above problems, the purpose of this utility model is to provide a shunt reactor compensation circuit in a substation. By adding a resistance-capacity absorber on the empty bus side of the system and a parallel turn-to-turn lightning arrester at both ends of the reactor, the switching of the shunt reactor can be reduced at the same time. The overvoltage of the busbar and load side can protect the shunt reactor equipment and system safety.

The utility model is for achieving above-mentioned purpose, and the utility model adopts following technical scheme:

A shunt reactor compensation circuit of a substation, comprising an empty bus, the empty bus is respectively connected to a first switch and a second switch line; wherein the first switch is connected to one end of a shunt reactor through a first cable, and the The other end of the shunt reactor is short-circuited with three phases as a neutral point; the shunt reactor is connected in parallel with the inter-turn arrester, one end of the inter-turn arrester is connected to the line of the arrester, and the other end of the arrester is grounded; the second switch The second cable is connected to the circuit of the resistance-capacity absorber, and the other end of the resistance-capacity absorber is grounded.

The first switch is a first switch of a vacuum circuit breaker or a first switch of an SF6 circuit breaker.

The second switch is a second switch of a vacuum circuit breaker or a second switch of an SF6 circuit breaker.

The RC absorber includes a resistor and a capacitor, one end of the resistor is connected to the second switch through a second cable, and the other end of the resistor is connected to the capacitor; the other end of the capacitor is grounded.

The resistor is a resistor of 10Ω-100Ω, and the capacitor is a capacitor of 0.2μF-0.8μF.

The beneficial effects of the utility model are as follows: the utility model provides a shunt reactor compensation circuit of a substation, which connects a resistance-capacitance absorber on the side of the system empty bus to increase the system's ground capacitance; , to absorb the inter-turn overvoltage of the shunt reactor, thereby reducing the overvoltage on the busbar and load side when the shunt reactor is switched, and protecting the shunt reactor equipment and system safety.

Description of drawings

Fig. 1 is a structural representation of the utility model.

Detailed ways

Example 1

As shown in Fig. 1, a shunt reactor compensation circuit of a substation provided by this embodiment includes an empty bus 1, and the empty bus 1 is connected to the first switch 2 of the vacuum circuit breaker and the second switch 7 of the vacuum circuit breaker respectively. The first switch 2 of the vacuum circuit breaker is connected to one end of the shunt reactor 4 through the first cable 3, and the other end of the shunt reactor 4 is three-phase short-circuited as a neutral point; the shunt reactor 4 is connected in parallel with the turn-to-turn arrester 6, one end of the turn-to-turn arrester 6 is connected to the line of the arrester 5, and the other end of the arrester 5 is grounded; the second switch 7 of the vacuum circuit breaker is connected to the RC absorber through the second cable 8 The circuit of the device 9 is connected, and the other end of the RC absorber 9 is grounded.

The RC absorber 9 includes a 20Ω resistor 10 and a 0.2 μF capacitor 11. One end of the 20Ω resistor 10 is connected to the second switch 7 of the vacuum circuit breaker through a second cable 8, and the 20Ω resistor 10 is connected to the second switch 7 of the vacuum circuit breaker. One end is connected to a 0.2 μF capacitor 11; the other end of the 0.2 μF capacitor 11 is grounded.

The bus bar is an empty bus bar 1, that is, it has no outgoing line or no load. The turn-to-turn arrester 6 plays the role of turn-to-turn overvoltage protection. For the 35kV system busbar, its parameters are: continuous operating voltage: 28kV; arrester rated voltage: 35 kV; DC 1mA voltage: 48 kV; operating impulse current residual voltage 30/60μs: 70 kV; lightning impulse current residual voltage: 90 kV; Square wave impulse current tolerance 2ms: 800A.

A compensation method for a shunt reactor compensation circuit in a substation, comprising the following steps:

1) When the load of the substation is light and the system voltage is high, and it is necessary to input inductive reactive power for reactive power compensation or voltage regulation, firstly close the first switch 2 to put the shunt reactor 4 into operation; at this time, the second switch 7 In the disconnected state, that is, the RC absorber 9 is in the out-of-operation state.

2) When the substation load increases, the system voltage decreases, and the inductive reactive power needs to be removed, the second switch 7 is first turned on, and the RC absorber 9 is put into operation; then the first switch 2 is turned off, and the shunt reactor 4 is out of operation; then Turn off the second switch 7 to make the RC absorber 9 out of operation. Since the shunt reactor 4 is out of operation, the side of the empty bus 1 is equipped with a resistance-capacitance absorber 9 to increase the capacitance of the system to ground, and the two ends of the shunt reactor 4 are connected in parallel with inter-turn arresters 6 to absorb inter-turn overvoltage, so that it can effectively Reduce the overvoltage of the shunt reactor 4 switching space-time bus 1 and the load side.

In the shunt reactor compensation circuit of a substation described in this embodiment, a resistance-capacitance absorber is connected to the system bus side to increase the system’s ground capacitance; inter-turn lightning arresters are connected in parallel at both ends of the shunt reactor to absorb the turns of the shunt reactor. The overvoltage between the shunt reactors can be reduced, thereby reducing the overvoltage on the busbar and load side when the shunt reactor is switched, and protecting the safety of the shunt reactor equipment and the system.

Example 2

As shown in Figure 1, a shunt reactor compensation circuit of a substation provided by this embodiment includes an empty bus 1, which is connected to the first switch 2 of the SF6 circuit breaker and the second switch 7 of the SF6 circuit breaker respectively. The line is connected; wherein the first switch 2 of the SF6 circuit breaker is connected to one end of the shunt reactor 4 through the first cable 3, and the other end of the shunt reactor 4 is three-phase short-circuited as a neutral point; the shunt reactor 4 is connected in parallel with the turn-to-turn arrester 6, one end of the turn-to-turn arrester 6 is connected to the line of the arrester 5, and the other end of the arrester 5 is grounded; the second switch 7 of the SF6 circuit breaker is connected to the RC absorber through the second cable 8 The circuit of the device 9 is connected, and the other end of the RC absorber 9 is grounded.

Described RC absorber 9 comprises the electric capacity 11 of the resistance 10 of 50 Ω, 0.6 μ F, the resistance 10 one end of described 50 Ω is connected with the second switch 7 of SF6 circuit breaker through the second cable 8, and the resistance 10 of described 50 Ω is connected to each other One end is connected to a 0.6 μF capacitor 11; the other end of the 0.6 μF capacitor 11 is grounded.

Bus 1 is an empty bus, that is, it has no outgoing line or no load. The turn-to-turn arrester 6 plays the role of turn-to-turn overvoltage protection. For the 35kV system busbar, its parameters are: continuous operating voltage: 28kV; arrester rated voltage: 35 kV; DC 1mA voltage: 48 kV; operating impulse current residual voltage 30/60μs: 70 kV; lightning impulse current residual voltage: 90 kV; Square wave impulse current tolerance 2ms: 800A.

A compensation method for a shunt reactor compensation circuit in a substation, comprising the following steps:

1) When the load of the substation is light and the system voltage is high, and it is necessary to input inductive reactive power for reactive power compensation or voltage regulation, firstly close the first switch 2 to put the shunt reactor 4 into operation; at this time, the second switch 7 In the disconnected state, that is, the RC absorber 9 is in the out-of-operation state.

2) When the substation load increases, the system voltage decreases, and the inductive reactive power needs to be removed, the second switch 7 is first turned on, and the RC absorber 9 is put into operation; then the first switch 2 is turned off, and the shunt reactor 4 is out of operation; then Turn off the second switch 7 to make the RC absorber 9 out of operation. Since the shunt reactor 4 is out of operation, the side of the empty bus 1 is equipped with a resistance-capacitance absorber 9 to increase the capacitance of the system to ground, and the two ends of the shunt reactor 4 are connected in parallel with inter-turn arresters 6 to absorb inter-turn overvoltage, so that it can effectively Reduce the overvoltage of the shunt reactor 4 switching space-time bus 1 and the load side.

In the shunt reactor compensation circuit of a substation described in this embodiment, a resistance-capacitance absorber is connected to the system bus side to increase the system’s ground capacitance; inter-turn lightning arresters are connected in parallel at both ends of the shunt reactor to absorb the turns of the shunt reactor. The overvoltage between the shunt reactors can be reduced, thereby reducing the overvoltage on the busbar and load side when the shunt reactor is switched, and protecting the safety of the shunt reactor equipment and the system.

Claims (5)

1. A shunt reactor compensation circuit in a substation, characterized in that it includes an empty busbar (1), and the empty busbar (1) is connected to the first switch (2) and the second switch (7) respectively; wherein the The first switch (2) is connected to one end of the shunt reactor (4) through the first cable (3), and the other end of the shunt reactor (4) is three-phase short-circuited as a neutral point; the shunt reactor ( 4) Connected in parallel with the turn-to-turn arrester (6), one end of the turn-to-turn arrester (6) is connected to the line of the arrester (5), and the other end of the arrester (5) is grounded; the second switch (7) passes through the second The second cable (8) is connected to the circuit of the resistance-capacity absorber (9), and the other end of the resistance-capacity absorber (9) is grounded. 2. The shunt reactor compensation circuit of a substation according to claim 1, characterized in that: the first switch (2) is a first switch of a vacuum circuit breaker or a first switch of an SF6 circuit breaker. 3. The shunt reactor compensation circuit of a substation according to claim 1, characterized in that: the second switch (7) is a second switch of a vacuum circuit breaker or a second switch of an SF6 circuit breaker. 4. The shunt reactor compensation circuit of a substation according to claim 1, characterized in that: the RC absorber (9) includes a resistor and a capacitor, and one end of the resistor connects to the second cable (8) through the second cable (8) The two switches (7) are connected, and the other end of the resistor is connected to the capacitor; the other end of the capacitor is grounded. 5. The shunt reactor compensation circuit of a substation according to claim 4, characterized in that: the resistance is a resistance (10) of 10Ω-100Ω, and the capacitance is a capacitance (11) of 0.2μF-0.8μF .

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