FLN36(12-40.5KV)load break switch

Model meaning

Normal service condition

◆Ambient  temperature:maximum  temperature+40℃,minimum temperature -40℃

◆Humidity:Maximum average daily relative humidity≤95%,maximum average monthly relative humidity≤90%

◆Altitude:≤2000 meters

◆Seismic capacity:8 degrees

◆ The surrounding air should be free from corrosive,flammable gas,water vapor and other obvious pollution,there should be no frequent violent vibration.

◆Annual leakage rate:≤0.1%

◆Special Conditions

When the load break switch is used at an altitude of more than 2000 meters,it needs to be specially noted so that the design scheme can be adjusted during manufacturing.

(At present,the load break switch manufactured by the company has a precedent of safe operation at an altitude of about 3,000 meters)

Structural principle

FLN36-12D load break switch main circuit and ground circuit are sealed in the epoxy resin made of APGl art cast insulation shell,with good insulation performance,anti-pollution environment and other advantages.The insulation shell is composed of the upper and lower insulation covers and is filled with SF6 gas with a relative pressure of 0.4bar.The lower insulation cover has explosion-proof measures to ensure that the overpressurized SF6 gas is directly sprayed into the rear channel of the cabinet in case of an accident,ensuring personal safety.

Arc-extinguishing principle

SF6 gas has good arc extinguishing performance.In order to extinguish the arc quickly,the switch generates an arc when the static and static contacts are just separated during the process of breaking the current.At this time,due to the magnetic field of the permanent magnet,the arc is driven around the static and static contacts to rapidly dissociate and cool,and is extinguished when the current is over zero.This permanent magnet rotating arc principle has strong extinguishing ability,light contact burn,and prolongs electrical life.

Structural characteristics

The load break switch and the combined appliance are composed of the same insulated body  switch body,the same spring operating mechanism,the fuse contact holder and the fuse  action impact trip system.The load break switch of the front connector of the touchable cable is composed of a special insulated body switch body and a general spring bath moving  mechanism.

The upper and lower body is injected by epoxy resin to form an inflatable inner cavity.The  rotating movement of the public moving contact can complete the three working states of  "make-break-ground"in order.The electric closing and opening can be installed on the basic  hand spring energy storage operating mechanism to achieve remote control operation  for  users to choose.

The front of the mechanism box is provided with SF6 gas pressure gauge and position  indication.The pressure gauge is used to monitor SF6 gas pressure changes.The position  indicating device is directly connected with the driving shaft of the moving contact,and the  working position of the indicating moving contact is absolutely reliable.

The rear part of the body is equipped with a safety diaphragm to meet the requirements of the  pressure system,and has the function of pressure release and escape.When some kind of  accident may occur in the arc extinguishing room,the pressure is too high.Overpressurized gas  can break through the diaphragm and be released.The gas is sprayed directly to the  rear,avoiding forward injection or other phenomena,thus ensuring personal safety.

The load break switch and the ground switch,the ground switch and the front door(the switch   has this interlock for cabinet allocation)have reliable mechanical interlocks.

Order instructions

The order should indicate:

◆Product model,name,specification,quantity;

◆Rated voltage,rated current;

◆Whether it is equipped with electric operating mechanism;

◆Name and quantity of spare parts and accessories;

◆Special conditions of use.

Technical  parameter

Item	Unit	Argument
Rated voltage	kV	12	24	40.5
Rated frequency	Hz	50/60
Rated current	A	630
1min power frequency withstand voltage,relative ground,phase/fracture	kV	42/48	65/79	95/110
Lightning impulse withstand voltage(peak)relative to ground,phase/fracture	kV	75/85	125/145	185/215
Main circuit rated heat stable current	kA/3s	20
Rated heat stable current of ground loop	kA/2s	20
Rated dynamic stable current(peak)	kA	50
Rated short-circuit closing current	kA	50
Rated closed-loop breaking current	A	630
Rated active load breaking current	A	630
Rated cable charging breaking current	A	10
Rated short-circuit breaking current	kA	20
Rated transfer current	A	1750	1400	1000
Mechanical life load break switch/ground switch	Time	3000/2000
SF6gas pressure (relative pressure at 20℃)	Mpa	0.045

*If you need to choose products,subject to relevant tests.

When the gas pressure in the switch is zero gauge pressure,the load switch can still operate the rated current.

12kV profile and mounting dimensions

Technical requirement

1,Rated voltage:12kv

2,rated current :630A

3,power frequency  voltage:48kv/1min no flashover and breakdown phenomenon

4,partial discharge:14.4kv/<10PC

5,screw hole tooth type is complete,can not feed

6,helium leak detection rate:≤4x10-8/ Pa m3/s

7,grounding induction capacitance :6pF

24kV profile and mounting dimensions

Technical requirement

1,Rated voltage:24kv

2,rated current:630A

3, power frequency voltage :65kv/ 1min no flashover and breakdown phenomenon

4, partial discharge :26.4kv/<10PC

5, screw hole tooth type is complete, can not feed

6, helium leak detection rate : ≤ 4x10-8/Pa m3/s

35kV profile and mounting dimensions

Technical requirement

1,Rated voltage :35kV

2, rated current :630A

3, to the ground/phase frequency voltage :70kV/1min

4, the fracture frequency withstand voltage :80kV/1min