CN103269051A - Lightning arrester for shunt reactor interturn over voltage protection and installing method of lightning arrester - Google Patents

Abstract

The invention discloses a lightning arrester for shunt reactor interturn over voltage protection and an installing method of the lightning arrester. The lightning arrester for the shunt reactor interturn over voltage protection comprises a lightning arrester body. The lightning arrester body is connected with a supporting insulator. A counter is arranged at the end, connected with the supporting insulator, of the lightning arrester body. The counter is respectively connected with the lightning arrester body and the supporting insulator through circuits. According to the lightning arrester for the shunt reactor interturn over voltage protection and the installing method of the lightning arrester, shunt reactor interturn over voltage level is obviously reduced and safety of shunt reactor operation under over voltage is effectively guaranteed.

Description

Lightning arrester for inter-turn overvoltage protection of shunt reactor and installation method thereof

the

technical field

The invention relates to a lightning arrester and an installation method thereof, in particular to a lightning arrester for inter-turn overvoltage protection of a shunt reactor and an installation method thereof.

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Background technique

In order to adjust voltage and reactive power, my country's power grid generally configures shunt reactors on the 35kV side of 220kV substations, uses vacuum circuit breakers for switching, and connects shunt reactors and vacuum circuit breakers through cables. When the vacuum circuit breaker breaks the shunt reactor of the 35kV neutral point ungrounded system, due to the free oscillation of the load side, the recovery voltage of the first open phase fracture rises much faster than the dielectric strength growth rate of the arc extinguishing chamber during normal breaking. In the partial arcing time range, the first open phase will have re-ignition breakdown. After the re-ignition occurs in the first open phase, due to the voltage escalation effect, the re-ignition occurs continuously and the intensity continues to increase. The transient current caused by the re-ignition is superimposed on the current of the last two phases due to the interaction coupling between the three phases, causing the current Equivalent interception causes strong equivalent interception overvoltage, which causes continuous breakdown of the three-phase fracture of the circuit breaker and affects all equipment on both sides of the circuit breaker.

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Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a lightning arrester and its installation method for inter-turn overvoltage protection of shunt reactors, which can significantly reduce the inter-turn overvoltage level of shunt reactors, and effectively ensure the safety of shunt reactors under operating overvoltages. .

The present invention is to achieve above-mentioned purpose, the present invention adopts following technical scheme:

A lightning arrester for inter-turn overvoltage protection of a shunt reactor, comprising a lightning arrester body, the lightning arrester body is connected to a post insulator; The insulator line is connected.

 The arrester body is a gapless zinc oxide arrester body.

The post insulators are 35KV post insulators.

The installation method of a lightning arrester for inter-turn overvoltage protection of a shunt reactor comprises the following steps: firstly, a shunt reactor is installed in series on the circuit breaker, and then the top of the gapless zinc oxide arrester body is connected to the side of the shunt reactor End connection, and then connect the connection end of the gapless zinc oxide arrester body and the 35KV post insulator to the neutral point end of the shunt reactor.

The beneficial effects of the present invention are: the present invention provides a shunt reactor turn-to-turn overvoltage protection surge arrester and its installation method, and the magnitude of the inter-turn overvoltage at both ends of the reactor caused by the operation overvoltage during the breaking process of the 35kV shunt reactor From about 150 kV to about 75kV, the inter-turn overvoltage level of the shunt reactor is significantly reduced, and the safety of the shunt reactor under operating overvoltage is effectively guaranteed.

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Description of drawings

Figure 1 is a schematic structural diagram of the invention.

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Detailed ways

Example 1

As shown in Figure 1, a lightning arrester for inter-turn overvoltage protection of a shunt reactor provided in this embodiment includes a lightning arrester body, the lightning arrester body is connected to a post insulator; a counter is installed at the connecting end of the lightning arrester body and the post insulator , and the counters are respectively connected to the arrester body and the post insulator circuit. The arrester body is a gapless zinc oxide arrester body 1 . The post insulator is 35KV post insulator 2.

The installation method of a lightning arrester for inter-turn overvoltage protection of a shunt reactor comprises the following steps: firstly, a shunt reactor is installed in series on the circuit breaker, and then the top of the gapless zinc oxide arrester body 1 is connected to the top of the shunt reactor The side ends are connected, and then the connection end of the gapless zinc oxide arrester body 1 and the 35KV post insulator 2 is connected with the neutral point end of the shunt reactor.

The rated technical parameters of the arrester are as follows: continuous operating voltage: 28kV; rated voltage of the arrester: 35 kV; DC 1mA voltage: 48 kV; operating impulse current residual voltage 30/60μs: 70 kV; Wave impulse current withstand 2ms: 800A.

The lightning arrester and its installation method for inter-turn overvoltage protection of a shunt reactor described in this embodiment, the magnitude of the inter-turn overvoltage at both ends of the reactor caused by the overvoltage during the breaking process of the 35kV shunt reactor is from about 150 kV The limit is about 75kV, which significantly reduces the inter-turn overvoltage level of the shunt reactor, and effectively guarantees the safety of the shunt reactor under operating overvoltage.

Claims (4)

1. shunt reactor turn-to-turn overvoltage protection lightning arrester, it is characterized in that: comprise lightning arrester body, described lightning arrester body links to each other with post insulator; The link of described lightning arrester body and post insulator is equipped with counter (3), and described counter (3) links to each other with lightning arrester body, post insulator circuit respectively.

2. a kind of shunt reactor turn-to-turn overvoltage protection lightning arrester according to claim 1, it is characterized in that: described lightning arrester body is zero-clearance zinc oxide lightning arrester body (1).

3. a kind of shunt reactor turn-to-turn overvoltage protection lightning arrester according to claim 1, it is characterized in that: described post insulator is 35KV post insulator (2).

4. a kind of shunt reactor turn-to-turn overvoltage protection according to claim 1 is with the installation method of lightning arrester; it is characterized in that may further comprise the steps: at first at the circuit breaker shunt reactor that is installed in series; then the top with zero-clearance zinc oxide lightning arrester body (1) is connected with the side of shunt reactor, and the link with zero-clearance zinc oxide lightning arrester body (1) and 35KV post insulator (2) is connected with the neutral end of shunt reactor then.