CN201450326U

CN201450326U - 10kv outdoor combined-type overvoltage protector

Info

Publication number: CN201450326U
Application number: CN2009200457558U
Authority: CN
Inventors: 不公告发明人
Original assignee: NANJING ZHENGRUI POWER TECHNOLOGY Co Ltd
Current assignee: NANJING ZHENGRUI POWER TECHNOLOGY CO., LTD.; Nanjing Power Supply Co of Jiangsu Electric Power Co
Priority date: 2009-05-18
Filing date: 2009-05-18
Publication date: 2010-05-05
Anticipated expiration: 2019-05-18

Abstract

Te utility model relates to a 10kv outdoor combined-type overvoltage protector which adopts a three-phase four-column structure and mainly comprises four protection elements. The protection elements adopt high-tension insulators outside and are provided with connecting terminals at two ends; one end of each protection element adopts a star connection; three of the four protection elements are mounted above a bracket, and the other ends of the three protection elements are respectively switched in phases A, B and C of protected equipment; the forth protection element is mounted below the bracket and the other end thereof is connected with an earthing seat; and discharge clearances are formed in the earthing seat to form four protection branch circuits. The overvoltage protector can limit the atmospheric over-voltage, as well as switching overvoltage and other transient overvoltage conditions, and can effectively limit interphase overvoltage while limit phase-ground overvoltage. The overvoltage protector is suitable for the 10kv circuit and can be mounted outdoors directly, and has the advantages of small size, soiling resistance, large discharge capacity, reliability and high security.

Description

The outdoor combination overvoltage protector of 10KV

Technical field

The utility model relates to the overvoltage protection of electric power system electric equipment, the restriction atmospheric over-voltage that especially can directly install and use out of doors in the 10KV circuit, system operation overvoltage and alternate superpotential protective device.

Background technology

Along with the development of China's electrical network, high-voltage electrical equipments such as various power transmission and transformation are increasing, and Lightning Over-voltage, power system operation overvoltage, and alternate overvoltage etc. is usually damaged high-voltage electrical equipment.Particularly in system with non effectively earth ed neutral, because electric equipment is more and start and stop are frequent, system can produce the insulation breakdown that the higher alternate overvoltage of serious switching overvoltage, particularly amplitude causes high-tension apparatus easily.Traditional overvoltage protection such as lightning arrester; its discharge voltage is more than 4 times of phase voltage; and between lightning arrester is connected on relatively; to the system operation overvoltage; particularly alternate overvoltage; do not have restriction at all; this easily causes the service life of solid insulation equipment to reduce greatly; form the weak link of insulation; cause puncturing over the ground, and can effectively limit alternate superpotential protective device at present, because the relation of rainwater and natural conditions; major part can only be in indoor use, and this brings obstruction for undoubtedly the development of whole electric utility.

Summary of the invention

In order to remedy the deficiency of existing conventional overvoltage protection; the utility model provides the three-phase and four-pole formula that can directly install out of doors in a kind of 10KV circuit overvoltage protection; not only can limit atmospheric over-voltage; restriction system switching overvoltage effectively also, particularly limit the GPF (General Protection False device the alternate overvoltage that can not limit.

The technical scheme that its technical problem that solves the utility model adopts is: adopt three-phase and four-pole formula structure; mainly comprise four protection components; their outside high-tension insulators that adopts; two ends are provided with binding post; one end of protection component adopts star connection to link to each other; wherein three are installed on the support top; their other end inserts respectively in A, B, the C three-phase of protected equipment in the 10KV circuit; a remaining protection component is installed on the support below; its other end links to each other with grounding base; leave discharging gap between the grounding base, form four protection branch roads.Protection component is made up of the zinc oxide valve plate that non-linear Zinc-oxide piezoresistor is concatenated into, and with the silicon rubber insulation sealing, the profile of full skirt can prevent effectively that rainwater from stopping and erosion, can install and use out of doors.

The utility model is connected protection component with discharging gap, both are protected each other.Utilize symmetrical structure, allow overvoltage protection device produce the effect that is equivalent to six lightning arresters (A, B, C, AB, AC, BC).Adopt the star-like mode of connection, (AB, AC, BC) is equivalent to have two lightning arrester strings together between phase and phase, can make voltage between phases reduce 60-70%, and the protection reliability improves greatly.

The beneficial effects of the utility model are, not only can limit atmospheric over-voltage, can also limit switching overvoltage and other temporary overvoltages, superpotential colleague between restriction phase-ground, again alternate overvoltage is effectively limited, can directly install out of doors, volume is little, resistant is dirty, discharge capacity is big, reliability and safe.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model

Fig. 2 is a structural representation of the present utility model

Embodiment

According to illustrated in figures 1 and 2; protection component FR core is to be concatenated into zinc oxide valve plate by non-linear Zinc-oxide piezoresistor in the utility model; the impregnation tube and the mold pressing of composite sheath Integratively of the high insulation of outside employing form, and core body and overcoat constitute closely knit integral body, prevent that inner member from making moist.

One end of protection component adopts star structure to interconnect; the other end is connected on three-phase phase line A, B, C and the earth connection D of protected equipment; CG is a discharging gap; it is relatively born by two protection components with alternate residual voltage; equipment insulation relatively can not only be protected, also equipment phase insulation safety can be protected effectively.Wherein three protection components equidistantly are installed on the support top, and a remaining protection component is installed in support centre position, below and triangle ground connection base joins.

Claims

1. a combination overvoltage protector is characterized in that: adopt three-phase and four-pole formula structure; mainly comprise four protection components; their outside high-tension insulators that adopts; two ends are provided with binding post; one end of protection component adopts star connection to link to each other; wherein three are installed on the support top; their other end inserts respectively in A, B, the C three-phase of protected equipment in the 10KV circuit; a remaining protection component is installed on the support below; its other end links to each other with grounding base; leave discharging gap between the grounding base, form four protection branch roads.

2. combination overvoltage protector according to claim 1 is characterized in that protection component is made up of the zinc oxide valve plate that non-linear Zinc-oxide piezoresistor is concatenated into, and seals with silicon rubber insulation.