VS1-24kV Indoor High Voltage Withdrawable Type Vacuum Circuit Breaker with Embedded Pole

VS1-24 series of indoor high voltage vacuum circuit breaker with embedded poles is three phrase A.C.50 Hz indoor power distribution equipment with the rated voltage of 24 KV. It’s used for protecting and controlling the electrical equipment in the fields of industry and mining enterprise, power plants and substation.

The main conductive circuit of this type vacuum circuit breaker with spring mechanism is embedded pole,that can greatly improve the reliability of insulation, mechanical and breaking performance and really realize the free-maintenance and longer mechanical and electrical life. This type of 24kV VCB conforms to national standards and the stipulations of IEC standard. The capability reaches grade of M-E2-C2.

The product is used for many kinds of MV switchgear like KYN28-24(GZS1) and can be fixed installation.

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VS1-24kV Indoor High Voltage Withdrawable Type Vacuum Circuit Breaker with Embedded Pole

Electrical Products

Features
Principle
Specifications
Dimensions

Main Domestic Standards of VS1-24kV Indoor HV Withdrawable Type Vacuum Circuit Breaker

JP3855-96 “General technical conditions for 3.6～40.5kV AC high voltage vacuum circuit breakers”
DL403-91 “Technical Conditions for Ordering of 10～35kV Indoor High Voltage Circuit Breakers”

Feautures of VS1-24kV Indoor HV Withdrawable Type Vacuum Circuit Breaker

1. The arc is extinguished in a sealed container, and the arc and hot gas are not exposed. As a separate component, the arc extinguishing chamber is simple and convenient to install and debug.
2. The contact gap is very small, generally about 10mm, the closing power is small, the mechanism is simple, and the service life is long.
3. The arc extinguishing time is short, the arc voltage is low, the arc energy is small, the contact loss is small, and the breaking times are many.
4. The inertia of the moving guide rod is small and can be used frequently.
5. The circuit breaker operating mechanism is small, the whole machine is small in size and light in weight.
6. The control power is small, and the action noise is small when the switch is operated.
7. The arc extinguishing medium or insulating medium does not need oil, there is no danger of life and explosion, and it is safe.
8. The contact head is divided into a completely sealed structure, which will not be affected by moisture, dust, harmful gases, etc. to reduce its performance. Reliable work, stable on-off performance.
9. After the arc is broken, the medium between the fractures recovers quickly, and the medium does not need to be replaced.
10. The medium will not age and do not need to be replaced. During the service life, the contact part does not need to be repaired or inspected. Generally, it can be up to about 20 years without maintenance. The maintenance workload is small and the maintenance cost is low, which is only about 1/20 of the oil-less circuit breaker.
11. It has the function of multiple reclosing, which is suitable for the application requirements of the distribution network.

Working Principle of VS1-24kV Indoor HV Withdrawable Type Vacuum Circuit Breaker

The vacuum circuit breaker working principle is: when the moving and static contacts are opened under the action of the operating mechanism, an arc is generated between the circuit breaker contacts, and the surface of the contacts volatilizes at high temperature. When passing through, a magnetic field is generated, and the arc moves rapidly along the tangential direction of the contact surface under the action of this magnetic field. Part of the metal vapor is condensed on the metal cylinder (shield), and the arc is extinguished when it naturally crosses zero. The strength of the medium quickly recovered.

Technical Specifications of VS1-24kV Indoor HV Withdrawable Type Vacuum Circuit Breaker

No.	Item	Unit	Data
1	Rated voltage	KV	24
2	Rated current	A	630	1250	1600		2000	2500		3150
3	Rated frequency	Hz	50
4	Rated short-circuit breaking current	KA	20		25			31.5
5	Rated short-circuit making current	KA	50		63			80
6	Rated short time withstand current	KA	20			25			31.5
7	Rated peak withstand current	KA	50			63			80
8	1min power frequency withstand voltage	KV	65
9	Rated lighting impulse withstand voltage	KV	125
10	Rated short-circuit duration	s	4
11	Rated operation sequence		O-0.3s-CO-180s-CO
12	Maximum D.C component		50%