CN112652472A

CN112652472A - Anti zero sequence current's of paralleling reactor insulation system

Info

Publication number: CN112652472A
Application number: CN202011579467.8A
Authority: CN
Inventors: 王辉; 张有伟; 汪志建; 谢劲松; 方越胜; 徐佩剑
Original assignee: Ningbo Ningbian Power Technology Co ltd
Current assignee: Ningbo Ningbian Power Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-04-13

Abstract

The invention discloses an insulation structure for zero sequence current resistance of a parallel reactor, and relates to a reactor, which comprises an upper clamp and a lower clamp, wherein an iron core is arranged between the upper clamp and the lower clamp, the upper clamp and the lower clamp are also provided with a side yoke screw rod for fixing the iron core, and an insulator is arranged between the side yoke screw rod and the iron core. Compared with the prior art, the invention can ensure the insulation of the side yoke screw rod under the condition that the insulation layer on the surface of the iron core is broken down, and prevent the generation of zero sequence current.

Description

Anti zero sequence current's of paralleling reactor insulation system

Technical Field

The invention relates to a reactor, in particular to a side yoke screw rod of the reactor.

Background

When a single-phase or more than two-phase ground short circuit fault occurs at any point in the power system, zero sequence current can be generated in the system. This is due to the fact that a zero sequence voltage U0 appears at the ground fault point, and a zero sequence current I0 is generated under the action of this voltage U0. The zero sequence current flows from the fault point to the neutral grounding point of the electrical equipment through the earth and then returns to the fault point, and the zero sequence current is a current reflecting the grounding fault. If zero sequence current occurs, the reactor can be greatly damaged, the loss of the reactor can be increased by about three times compared with a normal value due to the zero sequence current, the temperature rise of partial metal parts can be increased in a short time, and the reactor can be burnt seriously.

One type of ground fault is a sudden conduction of the iron yoke, which results in a failure of the ground, a zero sequence current is formed inside the iron core, and the reason for the sudden conduction of the iron yoke is a deformation or a denaturation of the insulation inside the iron core or a breakdown thereof.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an insulation structure for preventing zero sequence current of a parallel reactor, which can ensure the insulation of a side yoke screw rod and prevent the generation of zero sequence current under the condition that an insulation layer on the surface of an iron core is broken down.

In order to solve the technical problem, the invention is solved by the following technical scheme: an insulation structure of a parallel reactor for zero sequence current resistance comprises an upper clamping piece and a lower clamping piece, wherein an iron core is arranged between the upper clamping piece and the lower clamping piece, and a side yoke screw rod for fixing the iron core is further arranged on the upper clamping piece and the lower clamping piece.

In the above technical solution, preferably, the surface of the side yoke screw is covered with an insulating layer.

In the above technical solution, preferably, the insulator is provided with an insulating terminal.

In the above technical solution, preferably, the thickness of the insulator is at least 10 mm.

In the above technical solution, preferably, the insulator has a thickness of 20 mm.

In the above technical solution, preferably, the thickness of the insulating layer is at least 5 mm.

In the above technical solution, preferably, the thickness of the insulating layer is 10 mm.

The large iron core is often fixed by clamping the side yoke screw, although the surface of the iron core is provided with the insulating layer, the insulating layer on the surface of the iron core is thinner than the insulating layer on the contact part of the iron core and the side yoke screw, so that the insulating layer is broken down at the position, once the insulating layer is broken down, the iron core is conducted with the side yoke screw, and the iron core is also conducted with the upper clamping piece and the lower clamping piece to cause zero sequence current. In this application, all add insulator and insulating layer with all interfaces between the iron core on the side yoke screw rod, let even the iron core insulating layer is punctured and also can not let the electric current circulation pass through the side yoke screw rod, still guaranteed the holistic insulating nature of iron core simultaneously.

Compared with the prior art, the invention can ensure the insulation of the side yoke screw rod under the condition that the insulation layer on the surface of the iron core is broken down, and prevent the generation of zero sequence current.

Drawings

FIG. 1 is a schematic view of the present invention.

Detailed Description

Example 1: as shown in fig. 1, the insulation structure for zero sequence current resistance of the parallel reactor comprises an upper clamping piece and a lower clamping piece, wherein an iron core 1 is arranged between the upper clamping piece and the lower clamping piece, the upper clamping piece and the lower clamping piece are further provided with a side yoke screw 2 for fixing the iron core 1, an insulator 3 is arranged between the side yoke screw 2 and the iron core 1, the thickness of the insulator is at least 10mm, preferably 20mm, the surface of the side yoke screw is covered with an insulation layer 4, and the thickness of the insulation layer is at least 5mm, preferably 10 mm.

Claims

1. An insulation structure of a parallel reactor for zero sequence current resistance comprises an upper clamping piece and a lower clamping piece, wherein an iron core is arranged between the upper clamping piece and the lower clamping piece, and a side yoke screw rod for fixing the iron core is further arranged on the upper clamping piece and the lower clamping piece.

2. The parallel reactor zero sequence current resistant insulation structure according to claim 1, wherein the surface of the return yoke screw is covered with an insulation layer.

3. The parallel reactor zero sequence current resistant insulation structure according to claim 1, wherein the thickness of the insulator is at least 10 mm.

4. The parallel reactor zero sequence current resistant insulation structure according to claim 3, wherein the thickness of the insulator is 20 mm.

5. The parallel reactor zero sequence current resistant insulation structure according to claim 2, wherein the thickness of the insulation layer is at least 5 mm.

6. The parallel reactor zero sequence current resistant insulation structure according to claim 5, wherein the thickness of the insulation layer is 10 mm.