12kV Indoor Withdrawable type Vacuum Circuit Breaker/VCB

Specifications

1. Solid insulation, MV/HV, unique spring actuator
2. Frontal/withdrawable type
3. IEC standards, ISO9000, ISO1400

GENERAL DESCRIPTION

 

VYGQ series full encapsulation solid insulated vacuum circuit breakers, adopt the first full encapsulation structure and the latest solid insulating technology in the world, are in real sense solid insulated vacuum circuit breakers with high performance.

 

Internal structure of embedded pole is isolated from outside environment, not subject to ambient factors, such as dust, pollution, moisture or condensation, etc. The embedded pole is maintenance free. VYGQ series has high environmental adaptability and can run in adverse conditions.

 

With high performance, VYGQ series meet Class C2-E2-M2 requirements of Chinese National Standard GB1984-2003 and International Standard IEC62271-100, and other relevant standards.

 

VYGQ series passed a complete set of type test and other tests:

1. A complete set of type test

2. 5000m altitude test

3. Capacitor bank switching test

4. Grid performance test

 

VYGQ series has a full range of ratings and dimensions to meet different demand in industry.

 

The embedded pole of VYGQ series are made by special VULCANIZE process to create a cushion between the vacuum interrupter and the epoxy resin, ensuring a high reliability of the embedded poles

 

VYGQ series adopts advanced solid insulating technology for outer insulation of its vacuum interrupter, making it environmentally friendly.

 

APPLICATION

 

VYGQ series vacuum circuit breakers are widely used in power plants, substations, petrochemical plants, metallurgical industries, mining, manufacturing industry, airport, subway, seaport and residential areas, etc.

 

VYGQ series vacuum circuit breakers can be integrated into air insulated switchgears, a perfect replacement for the sleeve type air insulated vacuum circuit breaker.

 

VYGQ series vacuum circuit breakers can run stably under following conditions:

1. Altitude: 3000~5000m

    While application at 2000m and above, please specify your conditions.

2. Ambient temperature:

    Max:                                                                   +40°C

    Daily average:                                                 ≤+35°C

    Min.:                                                                   -15°C

3. Humidity:

    Daily average RH:                                            95%

    Monthly average RH:                                        90%

    Daily average saturated vapor pressure:       ≤2.2×10-3Mpa

    Monthly average saturated vapor pressure:   ≤1.8×10-3Mpa

4. Earthquake withstand ability: not exceed Grade 8

    Horizontal acceleration:

    Synthetic seismic wave                                      0.25g

    Sinusoidal wave                                                   0.15g

 

TECHNICAL FEATURES

 

1. Excellent performance

• Electrical life: in compliance with Class E2 of circuit breaker, 274 operations in various short circuit currents.
• Mechanical life: 30000 operations in compliance with Class E2 of circuit breaker
• Capacitive current making/breaking capacity: Class C2, rated single/back to back capacitor bank breaking current 630/400 A
• Rated voltages:12kV
• Rated current up to 4000A.

Main Technical Data

 

No.	Description	Unit	Parameter
1	Rated voltage	kV	12
2	short time power frequency with stand voltage(1min)	kV	42
3	Lighting impulse withstand voltage(peak)	kV	75
4	Rated frequency	Hz	50/60
5	Rated current	A	630-4000
6	Rated short circuit breaking current	kA	20-50
7	Rated short time withstand current	kA	20-50
8	Rated short circuit making current	kA	50-125
9	Rated short circuit duration time	s	4
10	mechanical endurance		30000/20000
11	Rated peak withstand current	kA	50-125
12	Rated capacitor banks making surge	kA	12.5
13	Rated electrical endurance		E2
14	Rated operating voltage		AC220/110, DC220/110

 

2. Advanced embedding technology and solid-insulating process

• Embedded poles: The three embedded poles of the VYGQ units totally enclose the vacuum interrupter, both upper and lower outgoing terminals cast in epoxy resin in APG process, a very mature automatic pressure gelatinizing technology. This helps to reduce adjustment requirements, diminish possible damage to the VI during assembly and protect connecting bolts against shock during operation. Also, discharge of the terminals can be prevented due to special conductive copper part. The embedded poles, in epoxy resin with unique material, make features of aging resistance, low/high-temperature resistance. These features protect the VI of the VYGQ system against any harmful influences from the outer environment. No shock & damp, pollution, condensation, dirt or small animal can ever have a possibility to face the VI, whereas those are always the headaches for the second generation. These distinctive features also enable the embedded poles a greater operating reliability, and high adaptability to various environments. The poles of the VYGQ series become truly maintenance-free.
• Unique cushion bedding process: Since there is a great discrepancy of thermal expansion between the vacuum interrupter (which is enveloped with porcelain) and the epoxy resin (namely 1:10), that will certainly result in various troubles, for instance, cracking problems to the porcelain envelope or to the epoxy resin. However, the special VULCANIZE process is employed for VYGQ series to settle the above problems in this way: a special flexible bedding fills the spaces between the epoxy resin and the VI, creating a quality cushion that responds to all thermal expansions and contractions, protecting all applied material from any occurrence of aging or insulation degrading, and therefore ensuring the high reliability of the poles under various environmental conditions and the changes of them. This cushion also eliminates air gap between epoxy resin and VI, which may be ionized under high voltage electric field cause insulation or aging problem of embedded pole.

 

3. A complete set of type test

 

VYGQ vacuum circuit breaker with embedded poles has passed a full set of type test in National High Voltage Apparatus Test Center, China.

 

 

4. Unique spring actuator

 

A spring actuator, compact design with less movable parts, advance face treatment process and lubricating technology, which ensure strong wear resistance and corrosion resistance, is provided to give every VYGQ unit an outstanding performance: rare fault, no any lubrication required in service, but great reliability and a much longer lifetime.

 

5. Advanced manufacture process, accurate test equipment and stringent quality policy

 

The embedding is done in the most advanced APG process, together with special chemical bonding agents imported, by using vacuum mixing facilities from HEDRICH Ltd., Germany, and Starling pressure moulding machine from VOGEL Ltd., Switzerland. Those make every VYGQ unit a great electrical performance and smart appearance.

The VYGQ series are manufactured and assembled in light-track production line, in addition to applying precise hydraulic and pneumatic tools, jigs and online test equipments. The ISO9001 quality policy is completely implemented to provide super VYGQ on the circuit breaker market.

 

6. Chinese national standards & international standards

 

The VYG series are designed to meet all the requirements of both Chinese national standards and the international standards as follows:

• GB1984-2003: “HVAC Circuit Breaker”
• DL/T402, DL/T403: Standards of Ministry of Electricity of China
• IEC62271-100:2001
• DIN VDE0670: German standards

7. Patented vacuum Interrupter with overall small resistance

 

The VYGQ series comprise the patented vacuum interrupter with an overall small resistance, in addition to adopting the patented contacts, characterized by high interrupting capacity, low chopping current, rapid recovery of insulation and great breaking capacity both of capacitive and inductive load.