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China XGTD9-12 Fixed Type Air Insulation Metal-enclosed Switchgear - Reliable Suppliers & Factory Solutions
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: 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 ≤ 95%, monthly average ≤ 90%
Pollution: No obvious pollution such as corrosive or flammable gas around
Vibration: 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
Frequently Asked Questions (FAQ)
Q1: What are the main differences between FT8-12D and FT8-12RD switch models?
A: The FT8-12D is an indoor HV AC vacuum load switch, while the FT8-12RD is a load switch-fuse combination. The combination model provides additional protection for the transformer against overload and prevents equipment operation during a phase loss.
Q2: Which international standards do these vacuum load switches comply with?
A: The products satisfy all major standards, including IEC60694 (common specs), IEC62271-100 (AC circuit breakers), IEC62271-200 (AC metal-enclosed switchgear), and equivalent GB/T and DL/T national standards.
Q3: What are the environmental limits for standard service conditions?
A: Standard operation requires altitudes ≤ 1000m above sea level, ambient temperatures between -25℃ and +40℃, and daily average relative humidity ≤ 95%. The location must be free of corrosive/flammable gases and violent vibrations.
Q4: Can the VT28-12D circuit breaker replace or work alongside the FT8-12D?
A: Yes. The VT28-12D circuit breaker has the exact same external dimensions and appearance as the FT8-12D, allowing for seamless visual integration, control, and protection of the power line.
Q5: What is the mechanical life of these load switches and circuit breakers?
A: Both the load switch and the circuit breaker are designed for long-term durability, featuring a rated mechanical life of up to 10,000 operations.
Q6: How does the switchgear structure prevent accidental mis-operation?
A: The operating mechanism box features a reliably integrated operation and "five prevention" interlocking mechanism designed specifically to prevent operational errors.