Overview
ZN63(VSSV1)-24 (Item Code: VSV24 )series indoor vacuum circuit breaker is rated voltage 24kV, three-phase AC 50Hz Indoor high-voltage switchgear, apply for power stations, substations, and industrial and mining enterprises to control or protection transmission and distribution systems, specially for the important high altitude breaking load and frequent operation place.
Circuit breaker operating mechanism for the spring energy storage type, can use AC and DC energy storage operations,can also be used manually. Circuit breaker can be equipped with long life permanent magnetic actuator, mechanical life can reached 60000 times, can be used for extremely Frequent operation place.
Circuit breaker designed to repackage the structure before and after, both can be used as a fixed installation unit, Can also be equipped with the chassis as used in the mounted unit.
Environmental Condition
Temperature: - 15℃ ~ 40℃ .The daily average temperature shall not exceed 35℃.
Humidity: The daily average shall not be more than 95%, the monthly average shall not be more than 90%.
Altitude: ≤1000m;
Water vapor pressure: The daily average value shall not exceed 2.2kPa, and the monthly average value shall not exceed 1.8kPa
Installation site: The surrounding air shall not obviously polluted by dust, smoke, corrosive and flammable gases, steam or salt spray.
Seismic Intensity: ≤ Grade 8
Structure & Principle
Basic Structure
The conductive circuit of the circuit breaker is a solid-sealed structure, and the conductive circuit is set in the insulating part. This structure can effectively prevent the influence of external factors including external force impact and polluted environment on the vacuum interrupter. The conductive circuit of the circuit breaker is installed at the rear of the mechanism box andis integrated with the mechanism.
Working Principle
The circuit breaker is equipped with a high-quality vacuum interrupter of the SHONEVAC brand, and the interrupter has a very high degree of vacuum. When the movable and fixed contacts are charged and opened under the action of the operating mechanism, an arc will be generated between the contacts. Since the moving and static contacts have inclined slots with the same inclination direction, when the arc current flows, a large circumferential component will be generated. A longitudinal magnetic field is formed between the contacts. Keep the arc in a diffuse shape, make the arc burn evenly on the contact surface, and maintain a low arc voltage. When the current naturally crosses zero, the residual ions, electrons and metal vapor can gather or recombine on the surface of the contact or the shield in microseconds, the dielectric strength of the fracture of the arc extinguishing chamber recovers quickly, and the arc is extinguished. To achieve the purpose of breaking. Due to the use of advanced longitudinal magnetic field technology, it has strong and stable current breaking capability.
Overall Dimensions
Electrical Circuit Diagram
Installation, Adjustment And Maintenance
Product Inspection
After unpacking the product, check whether the switch parts are deformed or damaged;
Whether the product nameplate and certificate of conformity are consistent with the order; whether the spare parts are complete. If you find that product damaged, the product does not match the order, or the packing list does not match the actual product, please notify
the carrier or the manufacturer immediately. After confirming that the product is intact, it can be installed.
Product Installation
The circuit breaker installed in the switch cabinet should not be subjected to tension or deformation, and disc spring washers should be added to the bolts at the bottom installation point. When connecting the main terminals, the main terminals cannot be subject to permanent tension or pressure (such as by the busbar, etc.). When connecting the busbar, bolts with strength ≥ 8.8 should be used, and disc springs should be used to fasten the busbar.
Adjustment
All work in commissioning and operation should be carried out by personnel who have received special training and have a detailed understanding of the performance of the circuit breaker. Appropriate protective and precautionary measures must be taken into account during work.
One of the prerequisites for trouble-free operation is to use the circuit breaker under normal working conditions according to the corresponding provisions of GB/T1984 and IEC60694 standards.
● Check the circuit breaker for damage or any other hazardous environmental influences. If there is such a phenomenon, it should be ruled out before powering on to restore to normal working conditions.
● Remove dirt, especially from the surface of the insulation. These may be due to the dirt caused during transportation or storage that will affect the insulation performance of the product.
● Check the primary circuit contact, the secondary circuit connection and the connection state of the grounding body.
● Manual operation test.
Maintenance
When the product is used more than the provisions of any item in the table, inspection and maintenance should be done.
|
No. |
Inspection Item |
Frequency |
|
1 |
Run Time |
60(120)Months |
|
2 |
Operation |
5000/4000/2500Times |
|
3 |
Breaking Times |
5000/4000/2500Times |
Before carrying out maintenance work, all auxiliary power sources must be disconnected and there is no risk of re-energization. Inspection and maintenance must be carried out by user-side personnel who are familiar with the equipment and have been trained and qualified.
1. After 5 years of operation (calculated from the day when the new equipment is put into operation) or the specified number of circuit breaker operations (circuit breakers of 25kA and below have been operated for 5,000 times, 31.5kA circuit breakers have been operated for 4,000 times, and circuit breakers of 40kA When the operation is over 2500 times), the operation structure needs to be checked:
● Cut off the energy storage power supply, and operate the circuit breaker to close and open once to release the energy of the mechanism.
● Check the grease condition on the rolling or sliding bearing surfaces
● Check the correct function of each component during electrical and mechanical action.
● Do a comprehensive visual inspection.
2. After 10 years of operation (calculated from the day when the new equipment is put into operation) or the specified number of circuit breaker operations (circuit breakers of 25kA and below have been operated for 10,000 times, 31.5kA circuit breakers have been operated for 8,000 times, and circuit breakers of 40kA When the operation is over 5000 times), the operation structure needs to be maintained:
● Cut off the energy storage power supply, and operate the circuit breaker to close and open once to release the energy of the mechanism.
● Re-apply lubricating grease to supporting shafts, rolling and sliding bearings and other parts that need to be lubricated.
● Check the correct function of each component during electrical and mechanical action.
● Check the condition or looseness of the fasteners installed on the connecting rods, crank arms, struts, etc.
● During maintenance, check the parts that are subjected to high stress during operation.
All fasteners should be replaced when the equipment is reassembled ifparts are replaced. Thoroughly review the operating mechanism.
The circuit breaker body should also be inspected after the circuit breaker has been in operation for about 5 years or when the operating mechanism is maintained. Especially when checking the appearance, it is also necessary to check the dirt, moisture and corrosion on the surface of the equipment.
In some special occasions or switchgear operating under harmful environmental conditions (such as in the environmental conditions of high pollution and heavy corrosive gas), the minimum interval of the above inspection work should be less than 5 years.
Main Technical Data
|
Data |
Unit |
Value |
|
Rated Frequency |
Hz |
50/60 |
|
Rated Voltage |
kV |
24 |
|
Rated Short-duration Withstand Voltage |
kV |
65 |
|
Rated Lightning Impulse Withstand Voltage |
kV |
125 |
|
Rated Current |
A |
630/1250/1600/2000/2500/3150 |
|
Rated Short-circuit Breaking Current |
kA |
20/25/31.5 |
|
Rated Short-duration Withstand Current |
kA |
20/25/31.5 |
|
Rated Duration of Short-circuit |
s |
4 |
|
Rated peak withstand current |
kA |
50/63/80 |
|
Rated single capacitor bank breaking current |
A |
400 |
|
Rated back to back capacitor bank breaking current |
A |
400 |
|
Rated Operaing Sequence |
O-0.3s-CO-180s-CO |
|
|
Mechanical Endurance |
Times |
30000 |
|
Max. DC component |
% |
50 |
|
Contact Stroke |
mm |
14±1 |
|
Contacting travel /Overtravel |
mm |
3.5±1 |
|
Closing Speed |
m/s |
1±0.2 |
|
Opening Speed (0-15mm) |
m/s |
1.3±0.2 |
|
Contact Opening and Closing Non-simultaneity |
ms |
≤2 |
|
Contact Closing Bouncing Duration |
ms |
≤2 |
|
Distance between Poles |
mm |
410/450±2 |
|
Contact Erosion Limit |
mm |
3 |
|
Rated Contact Pressure |
N |
2400±200/3100±200(31.5kA) |
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