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China XGTD9-12 Indoor Air Insulation Metal-Enclosed Switchgear Factory & Suppliers for 10kV Power Distribution
General
FT8-12D indoor HV AC vacuum load switch and FT8-12RD indoor HV AC vacuum load switch-fuse combination has the advantages of reliable interlocking, compact structure, small footprint, intuitive and convenient operation, elegant appearance, stable performance and frequent operation. The load switch-fuse combination also has the function of protecting the transformer from overload and preventing the equipment from running with phase lose.
The appearance of VT28-12D indoor HV AC vacuum circuit breaker is exactly the same as FT8-12D, which can control and protect power line.
Standard
Product quality assurance is based on the continuous improvement of product research, development design and production processes that meet the requirements of all aspects of the quality system. The basic parameters and technical indicators of the product meet the following standards.
IEC60694
Common specifications for high-voltage switchgear and control gear standards
IEC62271-100
High-voltage switchgear and control gear-Part 100: Alternating current circuit breakers
IEC62271-200
High-voltage switchgear and control gear-Part 200: AC metal-enclosed switchgear and control gear for rated voltage above 1kV and up to and including 52kV
GB/T3906
3.6kV~40.5KV AC metal-clad enclosed switchgear and control equipment
GB/T1984
High voltage AC circuit breaker
GB/T3804
3.6kV~40.5kV high voltage AC load switch
GB/T16926
High-voltage AC load switch-fuse combinations
DL/T404
3.6kV~40.5kV AC metal-enclosed switchgear and control equipment
DLT402
High voltage AC circuit breaker
Service conditions
- Altitude: Not more than 1000m above the sea level;
- Ambient temperature: Max.+40℃, Min.-25℃;
- Relative humidity: Daily average not more than 95%, monthly average not more than 90%;
- No obvious pollution such as corrosive or flammable gas around;
- No frequent violent vibration;
※Note: If the site condition deviates from the normal conditions of use, please confirm with our company.
Technical parameter
Main technical parameters of switchgear
| Item | Unit | Parameters | |
|---|---|---|---|
| Rated voltage | kV | 12 | |
| Rated frequency | Hz | 50/60 | |
| 1 min Rated power frequency withstand voltage (Phase to Phase, Phase to earth/isolation distance) | kV | 42/48 | |
| Lightning impulse withstand voltage (Peak, Phase to Phase, Phase to earth/isolation distance) | kV | 75/85 | |
| Rated main bus current | A | 630, 1250 | |
| Rated current of combined apparatus | A | 125/200 | |
| Rated short circuit breaking current | Fuse | kA | 31.5/50 |
| Circuit breaker | kA | 20, 25, 31.5 | |
| Rated short circuit withstand current/short circuit duration | kA/s | 20/4, 25/4, 31.5/4 | |
| Rated peak withstand current | kA | 50, 63, 80 | |
| Rated short circuit making current (peak) | kA | 50, 63, 80 | |
| Degree of protection | - | IP4X | |
Electrical parameters of load switch, load switch-fuse combined apparatus and circuit breaker
| Item | Unit | Parameters | ||
|---|---|---|---|---|
| Load switch | Combined apparatus | Circuit breaker | ||
| Rated voltage | kV | 12 | 12 | 12 |
| 1 min Rated power frequency withstand voltage (Phase to Phase, Phase to earth/isolation distance) | kV | 42/48 | 42/48 | 42/48 |
| Lightning impulse withstand voltage (Peak, Phase to Phase, Phase to earth/isolation distance) | kV | 75/85 | 75/85 | 75/85 |
| Rated current | A | 630 | 125/200 | 630, 1250 |
| Rated frequency | Hz | 50 | ||
| Rated short circuit breaking current | kA | - | 31.5/50 | 20, 25, 31.5 |
| Rated short circuit withstand current/short circuit duration | kA/s | 20/4 | - | 20/4, 25/4, 31.5/4 |
| Rated peak withstand current | kA | 50 | - | 50, 63, 80 |
| Rated short circuit making current (peak) | kA | - | - | 50, 63, 80 |
| Rated operation sequence | - | - | - | 0-0.3s-CO-180s-CO |
| Rated transfer current | A | - | 3150 | - |
| Mechanical life | times | 10000 | ||
Mechanical characteristic parameters of load switch and circuit breaker
| Item | Unit | Parameters | ||
|---|---|---|---|---|
| Load switch | Circuit breaker | |||
| Rated voltage | kV | 12 | 12 | |
| Rated short circuit breaking current | kA | - | 25 | 31.5 |
| Contact pressure | N | 1000 ± 100 | 2400 ± 200 | 3100 ± 200 |
| Clearance between opening contacts | mm | 9 ± 1 | 9 ± 1 | |
| Over travel | mm | 5.5 ± 1 | ||
| Average closing speed | m/s | 0.7 ± 0.2 | 0.7 ± 0.2 | |
| Average opening speed | m/s | 1.1 ± 0.2 | 1.1 ± 0.2 | |
| Contact closing bounce time | ms | ≤ 2 | ||
| Asynchronous opening and closing of three pole contact | ms | ≤ 2 | ||
Structure Instruction and Operation Instruction
● Basic structure of XGTD9-12 box type fixed switchgear
Switchgear enclosure is made of aluminum coated zinc plate, with protection grade of IP4X. The upper part is busbar compartment, and the lower part is switch and cable compartment installation, commissioning and maintenance can be done from the front.
● Technical Characteristics
- Busbar compartment and cable compartment of the switchgear are separated by metal plate.
- Switchgear is designed to have a compact structure, all live parts of each phase of the load switch(or circuit breaker)equipped on the switchgear are supported by a single insulating bushing.
- The operation and "five prevention"interlocking mechanism are reliably integrated in the operating mechanism box to prevent mis-operation.
- The circuit breaker and load switch have identical external dimensions, facilitating the expansion and combination of the switchgear.
- Switchgear can be installed against walls.
- It can be equipped with self-powered digital relay.
※Note: The operation function of the switchgear has been integrated in the operating mechanism of the vacuum switch. For the operation method, refer to the description of load switch and circuit breaker.
Typical internal structure of switchgear
Standard outline dimension of switchgear
Standard outline dimension layout
Frequently Asked Questions (FAQ)
What are the main advantages of the FT8-12D and FT8-12RD vacuum load switches?
They feature reliable interlocking, a compact structure, a small footprint, intuitive and convenient operation, an elegant appearance, stable performance, and the capability for frequent operation. Additionally, the load switch-fuse combination protects transformers from overload and prevents phase-loss operation.
Does the VT28-12D circuit breaker share the same design as the FT8-12D?
Yes, the appearance of the VT28-12D indoor HV AC vacuum circuit breaker is exactly the same as the FT8-12D, allowing it to control and protect power lines while maintaining structural consistency.
What are the standard ambient operating conditions for this equipment?
The equipment operates optimally under an altitude of not more than 1000m, ambient temperatures between -25℃ and +40℃, relative daily average humidity ≤ 95% (monthly ≤ 90%), without obvious corrosive or flammable gases, and free from frequent violent vibrations.
How is the safety and interlocking managed in the XGTD9-12 switchgear?
The operation and "five prevention" interlocking mechanism are reliably integrated directly into the operating mechanism box to prevent any potential mis-operation.
What international standards does this high-voltage switchgear comply with?
The product meets several key international and national standards, including IEC60694, IEC62271-100, IEC62271-200, GB/T3906, GB/T1984, GB/T3804, GB/T16926, DL/T404, and DLT402.