LVQB-110220
Adopting high-precision magnetic core and optimized winding technology, the LVQB-110220 delivers low measurement error and stable current conversion performance. It provides accurate and consistent data support for power grid metering, monitoring and fault analysis.
Featuring advanced fully sealed SF6 gas insulation structure, the product boasts excellent dielectric strength and arc extinction performance. It effectively prevents insulation aging and partial discharge, ensuring long-term stable and safe high-voltage operation.
The integrated fully enclosed structure offers superior waterproof, dustproof and anti-aging capabilities. It adapts to high-altitude, humid, polluted and other harsh outdoor environments, supporting all-weather reliable operation.
With compact layout and high mechanical stability, LVQB-110220 is easy to install and requires minimal daily maintenance. It effectively reduces operational costs for 110kV and 220kV power grid construction and renovation.
As reliable gas-insulated high-voltage measuring and protection equipment, LVQB-110220 features high precision and strong environmental adaptability. We supply global clients with factory direct sales, complete certifications and professional after-sales service.
Product Details
LVQB(T)-35/66/110/220
type SF6 gas insulated current transformer
□Introduction
□LVQB(T)-35/66/110/220 type current transformeris a kind of SF6 gas insulated independent current transformer with inverted structure researched and developed by our factory on the basis of similar products at home and abroad,it adopts SF6 gas of high electric-strength as the insulating medium,when comparing with oil-immersed transformer,this product has advantages of good insulating 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 adopts inverted structure,is composed of shell,explosion-proof sheet,machine body,bushing,base,density relay and other parts,there is shielding part inside the product that is used to improve the electric field,the secondary lead wire is connected in an airtight junction box, the shell can be divided into tee type and bell-jar type two types.
□Main insulation part adopts structure of coaxial columned uniform electric field.Primary guide rod and secondary shielding part form the coaxial columned uniform electric field mutually.Adopt primary series and parallel connection mode to change the current ratio,also could adopt primary parallel connection, all transformation ratios are got from the secondary tap.
□U pper part of the shell is equipped with explosion-proof sheet.Internal insulation of SF6gas insulated transformer boasts of high reliability,generally, it is impossible to have internal insulating fault arc,but considering internal arc may be caused by unpredictable accidental factors,we equip it with a explosion-proof sheet as a kind of safety measures.
□ External insulating bushing:products up to and including 220kV adopt high-strength porcelain bushing or HTV rubber composite hollow insulating bushing,it is able to withstand rated pressure of 1.6MPa(breaking pressure >4.0MPa)
□Base of the product is equipped with SF6 gas density relay,rated pressure is0.4MPa,when the internal pressure of product is 0.35MPa,density relay will give an alarm;when the pressure is 0.30MPa,density relay will give another alarm.SF6 density relay has automatic temperature compensation function,the indicated pressure value at-40℃~+60℃equals to the pressure value(density)at room temperature(20℃).Density relay is equipped with special nonreturn self-sealing valve,when the pressure gauge is removed,the valve will close automatically.
□ Sealing performance is the most important problem of SF6electrical apparatuses,the product adopts mature sealing structure design and strict position
-limit sealing,employs high quality sealing materials,meanwhile,it adopts sealant and waterproof adhesive to ensure long-term sealing performance, guarantee annual leakage rate of product is≤0.5%,make sure long-term safety running of product.
□Primary connection terminal adopts integral die-casting forming,has high mechanical strength.
□ Technical data
(1)Altitude:not exceed 2000m (the ones exceed 2000m shall be designed separately)
(2)Ambient temperature:-40℃~+50℃, daily mean temperature not exceeds 30℃
(3)Max monthly mean relative humidity:90%
(4)10min max average wind velocity:35m/s
5)Max ice coating thickness:10mm
(6)Class of pollution:Ⅲ、IV Class
2.Max voltage of equipment:40.5/72.5/126/252kV
3. Rated frequency:50H z
4. Rated primary current:300～4000A
5.Rated secondary current:1Aor5A
6.Secondary combination:0.2、0.2S、0.5、0.5S、5P、TPY、TPS
Class combination at random
7. Rated output:0.2 class、0.2S class、0.5 class、0.5S class、 5P class:20～60VA TPY class: 10~20Ω
8.Accuracy limit factor:20～40
9.Instrument security factor: ≤5
10.A ccuracy limit condition of class TPY:
a.primary time constant Tp=100ms or 60ms
b.short-circuit current direct component 100%(i.e.full migration)
c.specified working cycle:C-0.1 s-0-0.5S(or0.4S)-C-0.1s-0 (guarantee all accuracy class times are 0.4s)
d.symmetrical short-circuit current multiple:10、15、20
11. 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
12.Short-time thermal current:50-63kA、3S
13.Rated peak withstand current:125-160kA(peak)
14.Withstand voltage level under zero gauge pressure:1.3 times
of max working voltage of equipment
15.Partial discharge level:1.2 times of max working voltage of equipment ≤5pC
16.Annual gas leakage rate:≤0.5%
17. Water content of SF6 gas:≤150×10-6(V/V)
18.Radio interference level:1.1 times of max working voltage of equipment,radio interference voltage≤500μV
19.Specific creepage distance of external insulation:25mm/kV or 31mm/kV
20.Static bearing load of primary terminal:2000N~6000N
21.Max total mass of product:current transformer of 35kV:450kg (thereinto mass of SF6 gas is 4kg)
Current transformer of 66kV:500kg (thereinto mass of SF6gas is 5kg)
Current transformer of 110kV:600kg(thereinto mass of SF6gas is 7kg)
Current transformer of 220kV:1400kg(thereinto mass of SF6 gas is23kg)
□Outline dimension
Online Inquiry
Or use the inquiry form below. Our sales staff will contact you within 24 hours. Thank you for your interest in our products!
