CN201421756Y

CN201421756Y - Six-phase lightning protector

Info

Publication number: CN201421756Y
Application number: CN2009201432524U
Authority: CN
Inventors: 芮骏; 唐春林
Original assignee: 芮骏
Current assignee: Anhui Yitian Electrical Technology Co., Ltd.
Priority date: 2009-03-05
Filing date: 2009-03-05
Publication date: 2010-03-10
Anticipated expiration: 2019-03-05

Abstract

The utility model discloses a six-phase lightning protector, which comprises zinc oxide pressure-sensitive resistors and is characterized in that a first zinc oxide pressure-sensitive resistor (FR1),a second zinc oxide pressure-sensitive resistor (FR2) and a third zinc oxide pressure-sensitive resistor (FR3) are in head-to-tail mutually electrical connection to form a triangle, three vertexes ofthe triangle are respectively electrically connected with an A phase wire, a B phase wire and a C phase wire of a protected device, a fourth zinc oxide pressure-sensitive resistor (FR4), a fifth zincoxide pressure-sensitive resistor (FR5) and a sixth zinc oxide pressure-sensitive resistor (FR6) are respectively in series connection among the three vertexes of the triangle and a grounding wire (D)of the protected device; a first fuse wire (RD 1), a second fuse wire (RD2) and a third fuse wire (RD3) are respectively in series connection among the three vertexes of the triangle and the A phasewire, the B phase wire and the C phase wire of the protected device, thereby avoiding accidents of single-phase or inter-phase short circuit. The six-phase lightning protector has reasonable structureand stable work, and can be widely applied to inter-phase and phase-ground over-voltage protection of the protected device.

Description

Six phase lightning arresters

Technical field

The utility model relates to a kind of lightning arrester, especially a kind of six phase lightning arresters.

Background technology

Because of various high voltage electric equipments; dielectric strength as transformer, switch, motor etc. all has certain limit; for avoiding the harm of various overvoltage to these equipment, people are mostly at its other overvoltage protection device that is connected in parallel, as the three-phase overvoltage protection device that is using at present.This three-phase overvoltage protection device is intended to eliminate the harm to protected equipment of atmospheric over-voltage and switching overvoltage, and it is connected and composed by the four stars type by four zinc oxide varistors.This three-phase overvoltage protection device exists weak point, at first, the connection of four stars type exists earth-free neutral point, when the three-phase voltage balance of system, the neutral point current potential is zero, ground connection phase oxidation zinc varistor in the four stars type does not bear any voltage, only be in three alternate zinc oxide varistors in twos one group bear phase voltage, the performance parameter of every zinc oxide varistor in requiring in twos a group this moment should be consistent, otherwise, the zinc oxide varistor that performance parameter is not good enough is easy to aging and accidents caused, and this structural unreasonable hidden danger that both had been embedded in accident has caused the increase of manufacturing cost again; Secondly, when single-phase accident over the ground takes place in system, then the neutral point current potential is a phase voltage, ground phase oxidation zinc varistor and the alternate zinc oxide varistor that accident over the ground do not take place all need singly only bear respectively phase voltage, this moment, three zinc oxide varistors of protector were very easily breakdown and have an accident, even not breakdown temporarily, also will increase widely because of overaging makes the probability that has an accident; Once more, if any alternate zinc oxide varistor in the protector is damaged, also can form the phase fault accident at short notice, this kind accident will cause great economic loss.

The utility model content

The technical problems to be solved in the utility model provides a kind of rational in infrastructure for overcoming weak point of the prior art, six phase lightning arresters of working stability.

For solving technical problem of the present utility model, the technical scheme that is adopted is: six phase lightning arresters are made up of zinc oxide varistor, particularly,

First zinc oxide varistor, second zinc oxide varistor and the 3rd zinc oxide varistor head and the tail are electrically connected triangularity mutually, described leg-of-mutton three summits are electrically connected with A phase line, B phase line and the C phase line of protected equipment respectively, are used for alternate overvoltage protection;

Be serially connected with the 4th zinc oxide varistor, the 5th zinc oxide varistor and the 6th zinc oxide varistor between the ground wire of described leg-of-mutton three summits and protected equipment respectively, be used for the overvoltage protection between phase ground.

Further improvement as six phase lightning arresters; described first fuse, second fuse and the 3rd fuse of being serially connected with respectively between the A of leg-of-mutton three summits and protected equipment phase line, B phase line and C phase line is used to prevent the accident of single-phase short circuit or phase fault.

Beneficial effect with respect to prior art is; employing is with three end to end triangularities of zinc oxide varistor; and these leg-of-mutton three summits are electrically connected with three phase lines of protected equipment respectively; and the structure that is connected in series three zinc oxide varistors between the ground wire of these leg-of-mutton three summits and protected equipment respectively; both avoided neutral point; eliminated defective by its initiation; can realize again alternate with mutually between overvoltage protection; also because of alternate with mutually between zinc oxide varistor independently exist mutually; under any circumstance can bear system voltage by oneself, thereby be difficult for taking place aging accident.

Further embodiment as beneficial effect; between three phase lines of leg-of-mutton three summits and protected equipment, be serially connected with three fuses respectively; guaranteed arbitrary in six zinc oxide varistors just in case occur damaging; itself and system can be broken away from the extremely short time, stop to take place the accident of single-phase short circuit or phase fault.

Description of drawings

Below in conjunction with accompanying drawing optimal way of the present utility model is described in further detail.

Fig. 1 is a kind of basic structure circuit diagram of the present utility model.

Embodiment

Referring to Fig. 1, six phase lightning arresters respectively by three cross-over connections in alternate zinc oxide varistor and zinc oxide varistor between three are serially connected with mutually, and three fuses constitute.Its concrete connected mode is, the first zinc oxide varistor FR1, the second zinc oxide varistor FR2 and the 3rd zinc oxide varistor FR 3 head and the tail are electrically connected triangularity mutually, these leg-of-mutton three summits are electrically connected with A phase line, B phase line and the C phase line of protected equipment respectively, are used for alternate overvoltage protection; Be serially connected with the 4th zinc oxide varistor FR4, the 5th zinc oxide varistor FR5 and the 6th zinc oxide varistor FR6 between the ground wire D of these leg-of-mutton three summits and protected equipment respectively, be used for the overvoltage protection between phase ground; Between the A of leg-of-mutton three summits and protected equipment phase line, B phase line and C phase line, be serially connected with the first fuse RD1, the second fuse RD2 and the 3rd fuse RD3 respectively, be used to prevent the accident of single-phase short circuit or phase fault.

During use, only need the binding post of the first fuse RD1, the second fuse RD2 and the 3rd fuse RD3 upper end is electrically connected with the threephase cable of the other electric power system of protected equipment respectively and get final product.

Obviously, those skilled in the art can carry out various changes and modification to six phase lightning arresters of the present utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.

Claims

1, a kind of six phase lightning arresters are made up of zinc oxide varistor, it is characterized in that:

First zinc oxide varistor (FR1), second zinc oxide varistor (FR2) and the 3rd zinc oxide varistor (FR3) head and the tail are electrically connected triangularity mutually, described leg-of-mutton three summits are electrically connected with A phase line, B phase line and the C phase line of protected equipment respectively, are used for alternate overvoltage protection;

Be serially connected with the 4th zinc oxide varistor (FR4), the 5th zinc oxide varistor (FR5) and the 6th zinc oxide varistor (FR6) between the ground wire of described leg-of-mutton three summits and protected equipment (D) respectively, be used for the overvoltage protection between phase ground.

2, six phase lightning arresters according to claim 1; it is characterized in that between the A of leg-of-mutton three summits and protected equipment phase line, B phase line and C phase line, being serially connected with first fuse (RD1), second fuse (RD2) and the 3rd fuse (RD3) respectively, be used to prevent the accident of single-phase short circuit or phase fault.