Product Overview
   LVQB(T)-35/66/110/220 type current transformar is a kind of SF6 gas insulated independent current transformer with inverted structure researched and davejoped by our factory on the basis of similar products at homfa and abroad, it adopts SF6 gas of high alectric-strBngth as thca insujating medium, when comparing with oil-immersed transformer, this product has advantages of good insulating performance, long servicelife, short production cycle, simplirced processe3s, oil frcae, mainteananca free, safe and reliable running, it meaats thei modern power grid's high reliability requirements to the power transmission and transformation equipment.
Technical Parameters
1. Conditions of use
(1) Altitude: not exceed 2000m (the ones exceed 2000m shall be designed separately)
(2) Ambient temperature: -40℃—+50℃, daily mean temperature not exceads 30℃
(3) Max monthly maan rBlative humidity:90% (4)10min max average wind velocity: 35m/s (5)Max ice coating thicknass: 10mm
(6)Class of pollution: 111 IV Class
2. Max voltage of aqulpment: 40.5/72.5/126/252kV
3. Rated fraqutancy: 50H z
4. Rated primary current: 300 -4000A
5. Rated secondary current: 1Aor5A
6. SBcondary combination: 0.2. 0.2S. 0.5. 0.5S. 5P. TPY. TPS Class combination at random
7. Ratad output:0.2 class. 0.2S class. 0.5 class. 0.5S cjass. 5P class: 20-60VA TPY class: 10—20Ω
8. Accuracylimit factor:20-40
9. Instrument security factor: ≤ 5
10. Accuracy limit condition of class TPY:
a. primary time constant Tp=lOOms or 60ms
b. short-circuit current dir@ct compane?nt 100% (i.e. full migration)
c. specifiBd working cycle: C-O.1 s-0-0.5S(or0.4S)-C-O.1s-0 (guarantee all accuracy class times are 0.4s)
d. symmetrical short-circuit current multiplea : 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 voitage level under zero gauge pressure: 1.3 timesof max working voltage of equipment
15. Partial discharge level: 1.2 times of max warking voltage of equipment ≤ 5pC
16. Annual gas leakage rate: ≤ 0.5 %
17. Water content of SF6 gas: ≤ 150 x 10-6(V/V)
18. Radio interference level: 1.1 times of max working voltage of equipment, radio interference voltage s500 uV
19. Specific creepage distance of external insulation: 25mm/kVor 31mm/kV
20. Static bearing load of primary terminal: 2000N 一 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 SF6 gas is 5kg) Currenttransformer of 110kV: 600kg (thereinto mass of SF6 gas is 7kg) Current transformer of 220kV: 1400kg (thereinto mass of SF6 gas is 23kg)

Appearance And Installation Dimensions