VLF(R) -12 Withdrawable Vacuum Load Breaker

• Breaking Capacity: Middle Voltage Circuit Breaker
• Operation: Energy-storage Type
• Speed: Normal Type Circuit Breaker
• Model NO.: VLF(R)-12
• Arc-extinguishing Medium: Vacuum
• Installation: Withdrawable
• Structure: Load Switch
• Poles Number: 3
• Type: Switch
• Function: Protect and Control Power
• Certification: VDE, ISO9001-2000, CE, CCC
• Transport Package: Non-Solid Wooden Case
• Specification: metal and electrical parts
• Trademark: Longxiang
• Origin: Baoji, Shaanxi China
• HS Code: 8538900000
• Production Capacity: 10000PCS/Year

Product Description

Withdrawable type vacuum load breaker switch


General description
VLF(R)-12 vacuum load switch and fuse composite apparatus is an independently researched & developed new generation medium voltage switch products on the basis of extensively and profoundly market research and analysis, and combined with the generality of vacuum switch at home and abroad. It adopts HV fuse which can break a wide range of short circuit fault current within 10ms and matched with vacuum load switch.It can be used in transformers control and protection of transportation, chemical industry,petroleum and living community,especially transformers in 7.2KV~330KV range area and substation used small capacity transformer control and protection,so as to achieve remote operation and monitoring.




Outline drawing


Applying ambient conditions
a)Ambient temperature:-35~+40ºC
b)The height above sealevel:for 12kV is not exceed 1500m, for 7.2kV is not exceed 2000m.
c)Relative humidity:daily average relative humidity≤95%,monthly average relative humidity≤90%
d)Saturated vapour pressure:daily average value≤2.2kPa,monthly average value≤1.8kPa
e)Earthquake intensity:not exceed 8 degrees


Technical characteristics
VLF(R)-12 vacuum load switch and fuse combination apparatus adopts the three dimensional "Solidwork" software for design,using computer simulation technology to carry out preinstallation of each scheme during designing process, which provides reliable guarantee for the improvement of thoughts of experts and technical personnel and scheme optimization.

Modular and mold produced mechanism is with clear integral structure, beautiful, complete functions, simple operation and maintenance, reliable running etc.
Vacuum interrupter adopts vertical arrangement, which overcomes the gravity for dynamic conductive rod and moving contact inside the vacuum interrupter when horizontally installed. Vacuum interrupter outside selects the umbrella skirt & large creepage distance type, which overcomes the effects of environment on it. For plateau type it can choose casting embedded type, so as to achieve higher external insulation performance.


Reliable striker tripping module
The striker tripping module designing can guarantee that the load switch breaks fault current with reliable after the fuse fusing.
Fuse short circuit breaking fault is generally within 10ms(half a cycle), and the breaking current can be up to 50kA, with reliable
and efficient protection for transformer.


The fuse installation, fastening and heat radiating
High-voltage fuse is as shown in the right side picture,with the specific operation method as follows:firstly loosen the fuse grip of the main insulation part,and insert the fuse into front insulation part,impacting end is the direction of mechanism, and threads & fastens the screw clockwise, then locks the grip and process is completed. To replace the fuse, firstly loosen the fuse grip of the main insulation part, and then counterclcokwise rotates the front insulation part, the process completes. When it is running, the poles have column cooling holes on top, timely eliminates the heat from fuses, which guarantees reliable electrical performance and service life of the high voltage fuse.


Energy saving and environment protecting product
VLF(R)-12 vacuum load switch is with spring energy storage type operating mechanism. When meeting short circuit faults, it can achieve protection through primary fuse and mechanism, without applying secondary power supply, so it omits the conventional power supply such as UPS, DC screen etc., which is a kind of energy saving and environment friendly product.


Main technical specification

Item	Unit	Data
open distance between contacts	mm	8-10
contacts pressure spring stroke	mm	3-4.5
distance between phases	mm	150/210/275
out of simultaneity of C/O operations	ms	≤2
contact bounching duration at closing operation	ms	≤1
average closing speed	m/s	0.4~0.8
average opening speed	m/s	1.0~1.4
closing time	ms	≤60
opening time	ms	≤30
main circuit resistance	uΩ	≤100(280)
wear thickness of moved and fixed contact	mm	3

S.N.	Name	Unit	VLF-12 load switch	VLFR-12 load switch	VLF-12 vacuum circuit breaker
1	rated voltage	kV	12	12	12
2	rated power frequency withstand voltage 1min	kV	42	42	42
3	rated lighting impluse withstand voltage	kV	75	75	75
4	rated current	A	630	125	630
5	rated short circuit breaking current	kA		50	25
6	rated short circuit withstand current	kA	20		25
7	rated peak withstand current	kA	50		63
8	rated short circuit making current	kA	50		63
9	rated cable charging breaking current	A	30
10	rated breaking transfer current	A		3150
11	breaking no-load transformer	kVA	1250	1250
12	electrical endurance	cycles	10000	10000	10000
13	partial discharge magnitude	PC	≤5	≤5	≤5

Overall outline drawing



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