CN103280819A - Paralleling reactor compensation loop of transformer substation and compensation method of paralleling reactor compensation loop of transformer substation - Google Patents

Abstract

The invention discloses a compensation circuit for a shunt reactor in a substation and a compensation method thereof. One end of the shunt reactor is connected, and the other end of the shunt reactor is short-circuited to a neutral point; grounding; the second switch is connected to the circuit of the RC absorber through a second cable, and the other end of the RC absorber is grounded. The invention provides a shunt reactor compensation circuit of a substation and a compensation method thereof. By adding a resistance-capacitance absorber on the empty bus side of the system and a parallel turn-to-turn lightning arrester at both ends of the reactor, the bus and the load side can be simultaneously reduced when the shunt reactor is switched. overvoltage, protect shunt reactor equipment and system safety.

Description

A shunt reactor compensation circuit and compensation method for a substation

the

technical field

The invention relates to a compensation circuit and a compensation method thereof, in particular to a compensation circuit of a shunt reactor of a substation and a compensation method thereof.

the

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 a shunt reactor on the 35kV side, and the switching equipment generally uses a vacuum circuit breaker, which is installed in the switch room. 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.

the

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a shunt reactor compensation circuit and compensation method for a substation. By adding a resistance-capacitance absorber and a parallel turn-to-turn arrester at both ends of the reactor on the empty bus side of the system, the shunt reactance can be reduced at the same time. Overvoltage on the busbar and load side when the reactor is switched, protect the shunt reactor equipment and system safety.

The present invention is to achieve above-mentioned purpose, the present invention 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.

A compensation method for a shunt reactor compensation circuit of a substation comprises 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 adjustment, firstly close the first switch to put the shunt reactor into operation; at this time, the second switch is off state, that is, the RC absorber is in the out-of-service state;

2) When the substation load increases, the system voltage decreases, and the inductive reactive power needs to be removed, the second switch is first turned on, and the RC absorber is put into operation; then the first switch is turned off, and the shunt reactor is out of operation; then the second switch is turned off switch to make the RC absorber out of operation; when the shunt reactor is out of operation, there is a RC absorber on the side of the empty bus to increase the capacitance of the system to ground, and both ends of the shunt reactor are connected in parallel with turn-to-turn arresters to absorb turn-to-turn surge Voltage, which can effectively reduce the overvoltage of the space-time busbar and load side when the shunt reactor is switched.

The beneficial effects of the present invention are as follows: the present invention provides a shunt reactor compensation circuit of a substation and a compensation method thereof, in which a resistance-capacitance absorber is connected to the side of the system empty bus to increase the capacitance of the system to ground; parallel turns are connected at both ends of the shunt reactor The inter-turn arrester absorbs 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.

the

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

the

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.

The shunt reactor compensation circuit and compensation method of a substation described in this embodiment, connects a resistance-capacitance absorber on the side of the system bus to increase the system’s ground capacitance; The inter-turn overvoltage of the reactor can reduce the overvoltage on the busbar and load side when the shunt reactor is switched, and protect the safety of the shunt reactor equipment and system.

the

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.

The shunt reactor compensation circuit and compensation method of a substation described in this embodiment, connects a resistance-capacitance absorber on the side of the system bus to increase the system’s ground capacitance; The inter-turn overvoltage of the reactor can reduce the overvoltage on the busbar and load side when the shunt reactor is switched, and protect the safety of the shunt reactor equipment and system.

Claims (6)

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 . 6. The compensation method of the shunt reactor compensation loop of a substation according to claim 1, characterized in that it comprises the following steps: 1) When the substation load is light and the system voltage is high, and it is necessary to input inductive reactive power for reactive power compensation or voltage adjustment, firstly close the first switch (2) to put the shunt reactor (4) into operation; at this time The second switch (7) is 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 parallel reactance Then the second switch (7) is turned off to make the RC absorber (9) out of operation; when the shunt reactor (4) is out of operation, there is an RC absorber on the side of the empty bus (1) (9) to increase the capacitance of the system to ground, and inter-turn arresters (6) are connected in parallel at both ends of the shunt reactor (4) to absorb inter-turn overvoltage, thereby effectively reducing the shunt reactor (4) switching space-time bus ( 1) and overvoltage on the load side.

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