Products - CHINA·LONGXI ELECTRIC CO.,LTD.

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Products

FK(R)N12-12D Indoor Load Break Switch-Fuse Combination Apparatus

Summary

FKN12-12D series air-blast Ioad break switch and FKRN12-12D series air-blast load break switch-fuse combination apparatus are new series switchgear applies to three-phase electric distribution system of rated 12kV, acting as protecting and control apparatus for transformers, cable and overhead wiring. These series are especially applicable in rural, urban terminal substation and prefabricated substations, as well as ring network power supply. FKN12-12D can break and make Ioad current and over-current. FKRN12-12D can break and make over-current load current and short-circuit current(Iimited current fuse). This product is featured with impact structure aesthetic appearance. reliable interlock and high insulating level. In the spring storage operation mechanism, ON/OFF speed is free from the influence of the manpower. For the arc-extinguish, electric arc-extinguish inside the insulating cover, the free gas occurs at sparking do not cause descend of insulating level between phases and phase to earth. The insulation cover clapboard separates electrified part thus boost protection grade of ring main unit. The copper-tungsten contact and main contact brings along reliable conductivity and long life. This product achieves sound fame due to easy maintenance and operation as well as reliable performance. It is in compliance with IEC62271-105.

Ambient conditions

1. Altitude: ≤1000m;
2. Ambient temperature: -25%~+40℃;
3. Relative humidity: daily average≤95%, monthly average≤90%;
4. Eadhquake intensity: ≤8 degree;
5. Pollution degree: Ⅱ;
6. Applicable occasions should be free from inflammables, explosives, corrosives and severe vibration.

Model

Technical specification

No.	Item	Unit	FZN12-12D	FKRN12-12D(HRC fuse)
1	Rated voltage	kV	12	12
2	Rated power frequency	Hz	50/60	50/60
3	Rated currenl	A	630	125
4	1 min PF withstand voltage(phase to eadh，phase to phase)	kV	42	42
5	1 min PF withstand Voltage(across open contacts)	kV	48	48
6	Lightning impulse withstand voltage(phase to each, phase to phase)	kV	75	75
7	Lightning impulse withstand voItage(across open contacts)	kV	85	85
8	Rated short-time withstand current(thermal steadily)-LBS	kA	20
9	Rated short-time withstand current(thermal steadily)-earthing switch	kA	20
10	Rated short-circuit duration(thermal steadily time)-LBS	s	4
11	Rated short-circuit duration(thermal steadily time)-earthing switch	s	2
12	Rated short-circuit making current(peak)	kA	50
13	Rated breaking current active load breaking current	A	630
14	Rated breaking current loop breaking current	A	630
15	5% of rated active load breaking current	A	31.5
16	Rated breaking current cable charging current	A	10
17	Rated breaking current no-load transformer capacity	kVA	1250
18	Rated short-circuit breaking current(fuse)	kA		31.5
19	Rated transfer current	A		1200
20	Mechanical life	Times	2000	2000

Mechanical performance

No.	Item	Unit	Data
1	Distance of open contacts	mm	≥175
2	Central distance of poles	mm	210±2
3	Air clearance of poles	mm	≥125
4	Travel	mm	210±4
5	Over-travel	mm	≥40
6	Three pole making asynchronous	ms	≤10
7	Three pole breaking asynchronous	ms	≤5
8	Release tripper breaking time	ms	40~65
9	Main circuit resistance	μΩ	≤130

Outline dimension

	A	H	C	D	E	F	K	J	L	M	N	P	R	S	T	U	V	W	Z	Weight
FKN12-12D	390	880	600	210	648	270	67	50	155	287	171	368	11	337	170	94	105	868	180	70kg