Yfzrn21-12D/T125-31.5-Hv Load Break Switch with Grounding Knife

Model NO.: YFZRN21-12D/T125-31.5 Usage: Breaking&Making Load Current Number of Switch: Multi Control Switch Environment: Indoor High Voltage Application: Indoor Power Distribution Trademark: YF Function: Industry Pole: 3 Certification: SGS, ISO9001, CE Test Equipment: IEC Standard Protection: Circuit-Break Failure Protection Origin: Jiangyin Yunfeng, China Product Overview
YFZN21(FZN21)-12 indoor AC HV load switch and load switch-Fuse combination unit is applied in the indoor power distribution net with the rated voltage of 12kV and frequency of 50Hz for breaking and making  the load current. It has advantages of compact structure, long electrical endurance, availability for frequent operation, basically no maintenance, strong breaking and making capacity, safety, reliability and obvious isolating fracture, ect. Its performance meets requirements of GB 3804-2004 High-voltage alternating-current switches for rated voltage above 3.6kV and less than 40.5kV and GB 16926-2009 High-voltage alternating current switch-fuse combinations.

Model Specification



Characteristics:
         ---compact structure
         ---long electrical endurance
         ---availability for frequent operation
         ---basically no maintenance
         ---strong breaking and making capacity
         ---safety, reliability and obvious isloating fracture

Service Conditions
         1.Altitude≤1000m;
          2.Ambient temperature-25ºC-+ 40ºC;
          3.The daily average of relative humidity shall not be larger than 95% and the monthly average shall not be               larger than 90%:
          4.The ambient air shall not be subject to the obvious pollution such as corrosive or combustible gas and                   steam;
          5.The site without fire hazards and explosion hazards;
          6.The site that the seismic intensity does not exceed degree 8; the gradient shall not exceed 5°

Main Technical Paramenters

Serial No.	Item	Unit	YFZRN21-12 Load Switch-Fuse Combination Unit
1	Rated voltage	kV	12
2	Rated frequency	Hz	50
3	Rated current	A	Max.rated current of fuse 125A;
4	Rated short-circuit breaking current of fuse	kA	31.5;
5	Rated breaking-transfer(handover)current	A	2000
6	Rated active load breaking current	A	630
7	5% rated active load breaking current	A	31.5
8	Rated closed loop breaking current	A	630
9	Rated cable charging breaking current	A	10
10	Rated line charging breaking current	A	1
11	Rated earthing fault breaking current	A	30
12	Rated cable charging breaking current under earthing fault conditions	A	17.4
13	Rated short-time withstand current(thermal          ---Load switch(including disconnector)	kA/s	20/4
	stability current)                                                    ---Earthing switch	kA/s	20/2
14	Rated short-circuit making current	kA	50
15	Rated peak withstand current(dynamic current)	kA	50
16	1 min power-frequency withstand voltage(effective value)to earth,phase-to-phase,vacuum fracture/isolating fracture	kV/kV	42/48
17	Full-wave lightning impluse withstand voltage(peak) to earth,phase-to-phase,vacuum fracture/isolating fracture	kV/kV	75/85
18	Main loop resistance	μΩ	≤120
19	Mechanical life	Time	10000
20	Clearance between open contacts	mm	9±1
21	Overtravel(compression length of contact spring)	mm
22	Gross thickness of contact wear	mm	3
23	Average opening speed	m/s	0.8~1.2
24	Average closing speed	m/s	0.45~0.85
25	Rated contact pressure	N	900±200
26	Connact closing bounce time	ms	≤2
27	Three-phase opening and closing asynchronization	ms	≤1
28	Inter-pole center distance	mm	210±3
29	Distance between live parts and of phase to earth	mm	≥125
30	Closing operation torque of vacuum arc-extinguishing chamber	N.m	≤80
31	Opening operation force of vacuum arc-extinguishing chamber	N	≤10
32	Rated closing operation voltage	V	≌220/110
33	Rated opening operation voltage	V	≌220/110
34	Time of switch opening triggered by breaking of fuse	ms	35±5
35	Impact output energy at breaking of fuse	J(Joule)	1

Note: The sensor with live display can be used for the switch insulator

Selection of HV current-limiting fuse

Transformer capacity(kVA)	100	125	160	200	250	300/315	400	500	630	750/850	1000	1250	1600	2000	2500
Rated current of fuse(A)	16	16	16	20	25	31.5	40	50	63	80	80	100	125	160	200

The model of recommended fuse is XRNT-12HV current-limiting fuse;
The impact output energy of recommended fuse is:1J(Joule) middle-sized.
          






 

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