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24kv High Voltage Circuit Breaker , Ac Circuit Breaker Vacuum Are - Extinguishing Chamber

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Contact name:Lian Huanhuan

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24kv High Voltage Circuit Breaker , Ac Circuit Breaker Vacuum Are - Extinguishing Chamber

Country/Region	china
City & Province	ningbo zhejiang
Categories	Battery Chargers

Product Details

24kv Vacuum Are - extinguishing Chamber High Voltage AC Vacuum Circuit Breaker

NINGBO TIANAN (GROUP) CO., LTD.

Overview

VT19-24indoor HV vacuum circuit breaker is used in three-phase AC electric system of 50HZ,24kV. It is used as control and protection department in the mining company ,power factory and substation. Because of its special advantages, it is also suitable for the site which frequently operation under rated current or multiple breaking short-circuit current.

The circuit breaker is identified by some national standards and international relative standards, such as GB1984,GB/T11022,DL/T403 and IEC62271, etc. It has reliable lockage, used as truck department or fixed installation department.

The structure of vacuum arc-extinguish room

Vacuum arc-extinguish room is the core parts of circuit breaker to bear,make and break current energy. It has sufficient arc-extinguish function and high operation duration.

Insulation enclosure (1) of arc-extinguish room is made up of high intensity alumina ceramics material, both ends shall be welded stainless steel cover (6) and it will be formed into sealed cavity.
Inner layer of arc-extinguish room is metal shied cover(5) which metal moist caused by arc can be compounded or condensed on the metal shied cover in short time during terminal making & breaking, insulation media intensity of inner arc-extinguish room will be recover. Meantime, shied cover can protect ceramics enclosure from hurt of metal splashing.
Retracted stainless steel accordion pipe (4) is the important part of arc-extinguish room that moving terminal (3) can move in the fully-closed arc-extinguish room. Sealing function and long duration of accordion pipe is one of the main factors which decided the mechanical duration of vacuum arc-extinguish room.
Terminal is the heart of vacuum arc-extinguish room, adopt chromium-copper, advanced smelt technology can ensure the breaking function and electric duration of vacuum circuit breaker, and decrease the operation over-voltage level.

The main parameter of 24KV circuit breaker

Rated voltage		24kV
Rated frequency		50Hz
Rated lighting impulse withstand voltage		125kV
Rated 1 min power frequency withstand voltage		65kV
Rated operation sequence		O-0.3s-CO-180s-CO
Rated current (A)		630,1250	1250,1600,2000,2500
Rated short circuit breaking current (r.m.s, kA)		20/25	31.5
Rated short circuit making current (peak value, kA)		50/63	80
Rated short time withstand current/short circuit continuous time (kA/s)		20,25/4	31.5/4
Rated peak value withstand current (kA)		50/63	80
Breaking times of rated short circuit(times)		30
Mechanical duration (times0		20000
Weight (kg)	Fixed type	≤250
	Truck type	≤350

Name		Unit	Data
Distance of contact terminal		mm	12±1
Over-travel			4±1
Three-phase opening & closing asynchronous		ms	≤2
Tripping time of closing contact terminal		ms	≤2
Closing & opening time	Opening	ms	≤50
	Closing		≤70
Average opening speed(after opening 6mm)		m/s	1.4±0.3
Average closing speed(after closing 6mm)			0.8±0.2