High Voltage Current Transformer

LVQB(T)-35/66/110/220 current transformer

Item No.: LVQB(T)-35/66/110/220
This type current transformer is a kind of Sf6 gas insulated independent current transformer with inverted structure researched and developed by our factory on the basis of sinilar products at home and abroad.
Description
Description
Introduce

It adopt Sf6 gas of  high electric-strength as the insulating medium .

When comparing with oil-immersed transformer,this product has advantages of  good insulation peformance ,long service life,short performance,long service life,short production cycle,simplified processes,oil free,maintenance free,safe and reliable running .

It meets the modern power grid's high reliability requirements to the power transmission and transformation equipment.

Characteristic of structure
The product adoptsinverted structure.is composed of shell,explosion-proofsheet,machine body bushing.base.density.relay andother parts.
There is shielding partinsidethe productthats usedtoimprovethe elect ricfield.the secondaryleadwi reis connectedinan airtightjunction box.the shifeldmuually ellcan be divided into tee type and bell -lartypetwotypes.
Maininsulation part adopt structure of coaxial columned uniform electricfield Priman,guide rodandsecondaryshielding partformthe coaxial columneduniform electricshifeldmuually Adopt primary series and parallel connection mod to change the current ratio,also could adopt primary parallel connection.all transformation ratios are got from the secondary tap.
Base of the product eqipped withSF6 gasdensity relay.rated pressure is 0.4MPa ,when the internal pressure of product is 0.35Mpa ,density relay will give an alarm,when the pressure 0.2Mpa ,density relay will give another alarm SF6 density relay  has automatic temperaturecompensation function.
 Technical Parameter

 

TRANSDUCER
Altitude note exceed 2000 m (the ones exceed 2000m shall be designed separately)
Ambient temperature -40C°-+50C°
Max monthly mean relative humidity 
90%
10min max average wind velocity 35m/s
Maxice coating thickness 10mm
class of pollution
III,IV class
Rated insulating level 
current transformer of 35kV 
current transformer of 66kV
72.5/140/325kV
current transformer of 110kV
126/200/480kV
current transformer of 220kV
252/395/950kV
Short-time thermal current
50-63kA
Rated peak with stand current
125-160kA
With stand voltage level under zero gauge pressure
13times of max working voltage of equiment
Partial discharge level 
1.2 times of max working voltage of equipment <5pC
Annual gas leakage rate
<0.5%
Water content of SF 6 gas
<150*10-6(V/V)
Radio interference level
1.1 times of max working voltage of equipment radio interference voltage <500uV
Specific creepage distance of ecternalinsulation
25mm/kV or 31mm/kv 
Static bearing load of primary terminal
2000N-6000N
Max total mass of product 
current transformer of35kV:450kg (there into mass of SF5 gas is 4kg)
current transformer of66kV
500kg (there into mass of SF5 gas is5kg)
current transformer of110kV
600kg (there into mass of SF5 gas is 7kg)
current transformer of220kV
1400kg (there into mass of SF5 gas is 23kg)

 

Specification

 

Tee type
Type Dimensions
A B C D E
LVQB-35 1335 1630 1150 340 18
LVQB-66 1695 2040 1200 400 18
LVQB-110 2180 2460 1290 475 18
LVQB-220 3270 3655 1460 610 24

 

No. Name
1 Explosion-proof device
2 Tee type shell
3 primary connectoin terminal
4 extranal insulation bushing
5 Secondary junction box
6 discharge valve/Gas charge
7 Density Relay
8 Base
9 Conductive barin series connection

 

bell-lartype type




Type Dimensions
A B C D E
LVQB-35 1335 1630 1150 340 18
LVQB-66 1695 2040 1200 400 18
LVQB-110 2180 2460 1290 475 18
LVQB-220 3270 3655 1460 610 24

 

No. Name
1 Explosion-proof device
2 bell-lartype type shell
3 primary connectoin terminal
4 extranal insulation bushing
5 Secondary junction box
6 discharge valve/Gas charge
7 Density Relay
8 Base
9 Conductive barin series connection

 

Accuracy test

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365Ds NON-Stop Production 20Ys Professional Manufacturers
Professional designer and manufacturer of current transformer,
cooperated with Siemens ,schneider Fuji electrical softbank LG samdsung.
Tel:13968747975
Add:(Zhejiang Lierde Relay Co., Ltd.) Xinguang Ind. Zone, Liushi Town, Wenzhou, Zhejiang, China
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