FZRN21-40.5D Indoor High Voltage Air Load Break Switch

FZRN21-40.5D is a high-voltage vacuum load switch designed for indoor use, applicable to power systems with rated voltage 40.5kV and below. The product integrates vacuum arc extinguishing technology and disconnecting switch functions, featuring high reliability, long life and low maintenance,...

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Product Introduction

Technical parameters

NO.	Items	Unit	Value
1	Rated voltage	kV	40.5
2	Rated frequency	Hz	50
3	Maximum rated current of fuse	A	63
4	1min power frequency withstand voltage	kV	95/110
5	Lightning impulse withstand voltage	kV	185/215
6	Rated peak withstand current	kA	50
7	4S rated short time withstand current	kA	20
8	Rated active load breaking current	A	1250
9	Rated closed loop breaking current	A	1250
10	Rated cable charging breaking current	kA	21
11	Rated short circuit breaking current	kA	31.5
12	Rated short circuit making current	kA	80(expected peak value)
13	Mechanical life	times	10000

Technical parameters of vacuum load switch after installation and adjustment

No.	Name	Unit	Data
1	Contact clearance	mm	17 ± 1
2	Compression of contact spring	mm	4 ± 1
3	Average closing speed	m/s	0.8 ± 0.2
4	Average opening speed (opening distance reaches 6mm)	m/s	1.5 ± 0.2
5	Opening time	ms	≤ 60
6	Out of simultaneity of CO operations of three poles	ms	≤ 2
7	Contact bouncing duration at closing operation	ms	≤3
8	Distance between charged bodies and to ground	mm	≥300
9	Loop resistance between upper and lower supports	μΩ	≤80

Technical parameters of isolating switch after installation and adjustment

No.	Name	Unit	Data
1	Out of simultaneity of closing operation of three poles	ms	≤ 2
2	Deflection of just closing position of each pole	mm	≤ 2
3	Positive pressure of contact	N	260 ± 20
4	Fracture opening distance	mm	≥350
5	Loop resistance	μΩ	≤150

Technical parameters after adjustment of the assembly of earthing switches for combined electrical appliances

No.	Name	Unit	Data
1	Out of simultaneity of closing operation of three poles	ms	≤ 2
2	Deflection of just closing position of each pole	mm	≤ 2
3	Positive pressure of contact	N	450 ± 40
4	Fracture opening distance	mm	≥300

Technical Parameters of Fuses for Combination Appliances

Model	Rated Voltage(kV )	Rated current of fuse holder(A)	Fuse rated current (A)
XRNTЗA	12	16	3.15,63,10,16,
		40	20,25,31.5,40
		63	50,56,63

The use of environmental conditions
1.Air temperature: -25°C~+40°C;
2.Altitude: s1000m;
3.Relative humidity: daily average is not more than 95%,
4.Installation places: No fire, explosion hazard, serious filthy places.
5.Contamination level:ll

Structural characteristics

Combination of appliances for the three-pole linkage structure; mainly by the frame, vacuum interrupter, disconnecting switch (equipped with fuses), grounding switch and spring-operated mechanism composed of disconnecting switch.
Vacuum interrupter and grounding switch through the insulator country set on the frame, spring operating mechanism is mounted on the side plate of the frame.

Principle of operation

◆Operation of vacuum interrupter
Combination of electrical appliances vacuum interrupter room operation mode using electric spring actuator for closing, with the release solenoid for breaking, can also be used for manual closing. When closing manually, the operating handle is used to rotate the spring-operated mechanism's transducer shaft in clockwise direction.

◆Disconnecting switch, grounding switch, split, split operation
The vacuum interrupter, disconnecting switch and earthing switch of the combined appliance are equipped with a reliable mechanical interlocking device, and the disconnecting switch and earthing switch are operated by the same shaft. When the disconnecting switch is closed, the vacuum load switch is closed at last. The order of separation is reversed, and the isolating and earthing switches can be operated only when the vacuum load switch is in the tripping state.

◆Fuse impingement release tripping
When a short-circuit current or overcurrent flows through the main circuit of a combined appliance in the closing position, at least one phase of the fuse fuse is blown. Impactor action, tripping speed depending on the size of the current, the larger the current, the faster the speed of tripping, so that the combination of electrical mechanical release device action, so that the vacuum interrupter in the action of the tripping spring to achieve a reliable and rapid tripping.

General drawing

product-745-434

product-748-412

Contact us

If you are looking for the manufacturer or supplier of FZRN21-40.5D Indoor High Voltage Vacuum Load Switch, here are contact information:pannie@hdswitchgear.com.Let me know your requirements!