CN203312750U - Lightning arrester for turn-to-turn over-voltage protection of shunt reactor - Google Patents

Abstract

The utility model discloses a lightning arrester for inter-turn overvoltage protection of a shunt reactor, which comprises a lightning arrester body, the lightning arrester body is connected with a post insulator; The main body of the arrester and the post insulator are connected to each other. The utility model provides a lightning arrester for protecting the inter-turn overvoltage of a shunt reactor, which can significantly reduce the inter-turn overvoltage level of the shunt reactor and effectively ensure the safety of the shunt reactor under operating overvoltage.

Description

A surge arrester for inter-turn overvoltage protection of shunt reactor

technical field

The utility model relates to a lightning arrester, in particular to a lightning arrester for inter-turn overvoltage protection of parallel reactors.

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 interrupter fracture 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 is continuously enhanced. 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.

Utility model content

In order to solve the above problems, the purpose of this utility model is to provide a lightning arrester 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 utility model is for achieving above-mentioned purpose, and the utility model 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 beneficial effects of the utility model are: the utility model provides a shunt reactor turn-to-turn overvoltage protection surge arrester, and the amplitude of the turn-to-turn overvoltage at both ends of the reactor caused by the overvoltage during the breaking process of the 35kV shunt reactor is from 150 The kV is limited to 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.

Description of drawings

Figure 1 is a schematic structural diagram of the utility model.

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 surge arrester for inter-turn overvoltage protection of a shunt reactor described in this embodiment limits the amplitude of inter-turn overvoltage at both ends of the reactor from about 150 kV to about 75 kV during the breaking process of the 35 kV shunt reactor. , significantly reducing the inter-turn overvoltage level of the shunt reactor, effectively ensuring the safety of the shunt reactor under operating overvoltage.

Claims (3)

1. A lightning arrester for inter-turn overvoltage protection of a shunt reactor, characterized in that: it includes a lightning arrester body, the lightning arrester body is connected to a post insulator; a counter (3) is installed at the connecting end of the lightning arrester body and the post insulator, and The counter (3) is respectively connected with the lightning arrester body and the post insulator circuit. 2 . The lightning arrester for inter-turn overvoltage protection of shunt reactor according to claim 1 , characterized in that: the lightning arrester body is a gapless zinc oxide lightning arrester body ( 1 ). 3. The lightning arrester for inter-turn overvoltage protection of shunt reactor according to claim 1, characterized in that: the post insulator is a 35KV post insulator (2).

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