✅ Professional High Voltage Switchgear Manufacturer in China
We are a professional manufacturer of high voltage switchgear (HV switchgear) for EPC projects, power plants, substations, petrochemical, metallurgy, and industrial power distribution applications. High voltage switchgear is an assembly of circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, and busbars housed within a metal-clad enclosure, designed to control, protect, and isolate electrical equipment operating at voltages from 3.6kV up to 40.5kV[reference:0][reference:1]. Our product portfolio includes KYN28-12 armored metal-clad withdrawable switchgear, KYN61-40.5 armored withdrawable AC metal-enclosed switchgear, KYN28A-12/P withdrawable switchgear, and PT/voltage transformer cabinets[reference:2]. All products comply with IEC 62271-200, GB/T 3906-2020, and GB/T 11022-2020 standards[reference:3][reference:4], offering reliable power distribution, protection, and control solutions for diverse project requirements.
High voltage switchgear is the core equipment for medium and high voltage power distribution systems, responsible for receiving, distributing, and controlling electrical energy from transmission networks to distribution networks. Key functions include electrical isolation, circuit protection, fault interruption, and system monitoring. Our HV switchgear products feature[reference:5][reference:6]:
| Feature | Description |
|---|---|
| Armored Metal-Clad Construction | All metal compartments are reliably grounded, with independent pressure relief channels for each compartment[reference:7] |
| Withdrawable / Removable Design | Circuit breaker trucks can be withdrawn for maintenance without power interruption[reference:8] |
| Full "Five-Protection" Interlocking | Prevents misoperation: no live entry, no closing with earth switch on, no opening with load, etc.[reference:9][reference:10] |
| High Short-Circuit Withstand | Rated short-circuit withstand up to 50kA/4s, peak withstand up to 100kA[reference:11] |
| High Breaking Capacity | Rated short-circuit breaking current up to 50kA, suitable for demanding fault conditions[reference:12] |
| Flexible Configuration | Accommodates vacuum circuit breakers (VS1, VD4, ZN63A), contactors, PT trucks, metering trucks, isolation trucks[reference:13] |
| High Protection Level | Enclosure IP4X; breaker compartment IP2X when door open[reference:14][reference:15] |
| International Standards Compliance | IEC 62271-200, GB/T 3906-2020, GB/T 11022-2020 certified[reference:16][reference:17] |
| Wide Application Range | Power plants, substations, petrochemical, metallurgy, mining, infrastructure, EPC projects[reference:18] |
The KYN28-12 series is a metal-clad, withdrawable AC metal-enclosed switchgear designed for indoor three-phase 50Hz power systems with rated voltages of 3.6kV to 12kV. It is widely used in power plants, substations, and industrial facilities for receiving and distributing electrical energy[reference:19][reference:20]. The switchgear features a modular assembled structure with the withdrawable part (circuit breaker truck) that can be easily moved between test/isolated and working positions[reference:21].
| Parameter | Specification |
|---|---|
| Rated Voltage | 3.6kV, 7.2kV, 12kV[reference:22] |
| Rated Frequency | 50Hz[reference:23] |
| Main Busbar Current | 630A, 1250A, 1600A, 2000A, 2500A, 3150A, 4000A[reference:24] |
| Branch Busbar Current | 630A, 1250A, 1600A, 2000A, 2500A, 3150A, 4000A* (*with ventilation)[reference:25] |
| Rated Short-Circuit Withstand (4s) | 16kA, 20kA, 25kA, 31.5kA, 40kA[reference:26] |
| Rated Peak Withstand Current | 40kA, 50kA, 63kA, 80kA, 100kA[reference:27] |
| Rated Short-Circuit Breaking Current | 16kA, 20kA, 25kA, 31.5kA, 40kA[reference:28][reference:29] |
| Rated Short-Circuit Making Current | 40kA, 50kA, 63kA, 80kA, 100kA[reference:30] |
| Power Frequency Withstand (1min) | 24kV, 32kV, 42kV[reference:31] |
| Lightning Impulse Withstand (Peak) | 40kV, 60kV, 75kV[reference:32] |
| Protection Level | Enclosure: IP4X; Breaker compartment (door open): IP2X[reference:33][reference:34] |
| Cabinet Dimensions (H×W×D) | 2300×800×1500mm (up to 1250A) / 2300×1000×1500mm (1600A+)[reference:35] |
| Standards | IEC 62271-200, GB/T 3906-2020, GB/T 11022-2020[reference:36][reference:37] |
The KYN61-40.5 series is an armored withdrawable AC metal-enclosed switchgear designed for indoor three-phase 50Hz power systems with rated voltages up to 40.5kV. It is used in power plants, substations, and industrial facilities for receiving and distributing electrical energy, with control, protection, and monitoring functions. It is also suitable for frequent operation applications[reference:38][reference:39].
| Parameter | Specification |
|---|---|
| Rated Voltage | 40.5kV[reference:40][reference:41] |
| Rated Frequency | 50Hz[reference:42] |
| Rated Current | 630A ~ 3150A[reference:43] |
| Standards | IEC 62271-200, GB/T 3906-2020[reference:44] |
| Application | Power plants, substations, industrial distribution, frequent operation[reference:45] |
The KYN28A-12/P series is a withdrawable medium voltage switchgear designed for generator parallel/parallel-grid systems consisting of medium voltage (6.3kV or 10.5kV) generator sets, withdrawable parallel switchgear, PT (voltage transformer) cabinets, outgoing cabinets, and parallel-grid control devices[reference:46]. Optional components include generator neutral grounding resistor cabinets and differential protection devices. The complete system can supply power to the grid or directly to loads[reference:47].
| Parameter | Specification |
|---|---|
| Rated Voltage | 6.3kV, 10.5kV[reference:48] |
| Type | Withdrawable[reference:49] |
| Application | Generator parallel/parallel-grid systems[reference:50] |
| Key Components | PT cabinets, outgoing cabinets, parallel-grid control devices[reference:51] |
| Component | Available Options |
|---|---|
| Vacuum Circuit Breakers | ZN63A (VS1), VD4, ZN21, 3AH, VB2, VEP[reference:52] |
| Vacuum Contactors | VC7[reference:53] |
| Switch Trucks | PT truck, metering truck, isolation truck, station transformer truck[reference:54] |
| Parameter | Specification Range |
|---|---|
| Standards | IEC 62271-200, GB/T 3906-2020, GB/T 11022-2020[reference:55] |
| Rated Voltage | 3.6kV, 7.2kV, 12kV, 24kV, 40.5kV[reference:56][reference:57] |
| Rated Frequency | 50Hz / 60Hz[reference:58] |
| Rated Current (Main Busbar) | Up to 4000A (KYN28-12)[reference:59] |
| Short-circuit Withstand (4s) | 16kA ~ 50kA[reference:60][reference:61] |
| Peak Withstand Current | 40kA ~ 100kA[reference:62] |
| Rated Short-circuit Breaking Current | Up to 50kA[reference:63] |
| Protection Level | IP4X (enclosure), IP2X (compartment door open)[reference:64][reference:65] |
| Installation Type | Floor-mounted, indoor |
| Operation | Front operation, front maintenance[reference:66] |
| Altitude | ≤1000m (standard) / up to 4000m (special)[reference:67][reference:68] |
| Ambient Temperature | -15°C ~ +40°C (daily avg ≤ +35°C)[reference:69] |
| Relative Humidity | Daily avg ≤95%, Monthly avg ≤90%[reference:70] |
| Seismic Resistance | ≤8 degrees[reference:71] |
| Application | Power plants, substations, petrochemical, metallurgy, mining, infrastructure, EPC projects[reference:72][reference:73] |
* Custom specifications are available upon request for EPC project tenders.
| Application Condition | Recommended Series | Reason |
|---|---|---|
| 12kV power distribution / General industrial | KYN28-12 | Proven design, up to 4000A, 50kA, wide application[reference:74] |
| 40.5kV power plants / Substations | KYN61-40.5 | High voltage rating, frequent operation capability[reference:75] |
| Generator parallel / Grid interconnection | KYN28A-12/P | Withdrawable, PT cabinets, protection devices[reference:76] |
| High altitude (>1000m) installations | KYN28-12 (High-altitude) | Up to 4000m with derating[reference:77] |
| Space-constrained / Wall-mounted | KYN28-12 (Wall-mounted) | Front maintenance, reduced footprint[reference:78] |
Q1: What is high voltage switchgear?
A: High voltage switchgear (HV switchgear) is an assembly of electrical components including circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, and busbars housed within a metal-clad enclosure. It is designed to control, protect, and isolate electrical equipment operating at voltages from 3.6kV up to 40.5kV[reference:79].
Q2: What is the difference between high voltage and low voltage switchgear?
A: High voltage switchgear operates at voltages from 3.6kV to 40.5kV and is used in power plants, substations, and primary distribution systems. Low voltage switchgear operates at voltages up to 1,000V and is used in secondary distribution and end-use applications. HV switchgear has higher insulation requirements, larger clearances, and more robust construction to handle higher fault currents and dielectric stresses[reference:80].
Q3: What are the main types of high voltage switchgear?
A: The main types include: Air-insulated switchgear (AIS) — using air as the primary insulation medium; Gas-insulated switchgear (GIS) — using SF6 gas for compact designs; and Metal-clad switchgear — with grounded metal compartments for each functional unit[reference:81]. Our KYN series is metal-clad air-insulated switchgear.
Q4: What standards do your high voltage switchgear products comply with?
A: Our HV switchgear products are manufactured in compliance with IEC 62271-200 (international standard for AC metal-enclosed switchgear above 1kV up to 52kV)[reference:82], GB/T 3906-2020 (Chinese national standard for 3.6kV~40.5kV AC metal-enclosed switchgear)[reference:83], and GB/T 11022-2020 (common specifications for HV switchgear)[reference:84].
Q5: What is the KYN28-12 series switchgear?
A: The KYN28-12 series is an armored metal-clad withdrawable AC metal-enclosed switchgear designed for indoor three-phase 50Hz power systems with rated voltages of 3.6kV to 12kV. It features a modular assembled structure with withdrawable circuit breaker trucks, full "five-protection" interlocking, and is widely used in power plants, substations, and industrial facilities[reference:85][reference:86].
Q6: What is the KYN61-40.5 series switchgear?
A: The KYN61-40.5 series is an armored withdrawable AC metal-enclosed switchgear designed for indoor three-phase 50Hz power systems with rated voltages up to 40.5kV. It is used in power plants, substations, and industrial facilities and is suitable for frequent operation applications[reference:87][reference:88].
Q7: What is the rated voltage range for high voltage switchgear?
A: Standard rated voltages include 3.6kV, 7.2kV, 12kV, 24kV, and 40.5kV[reference:89][reference:90]. The most common ratings are 12kV (KYN28-12) and 40.5kV (KYN61-40.5).
Q8: What is the maximum current rating for high voltage switchgear?
A: For the KYN28-12 series, main busbar current ratings range from 630A up to 4000A[reference:91]. For the KYN61-40.5 series, ratings range from 630A up to 3150A[reference:92].
Q9: What is the short-circuit withstand capability?
A: For the KYN28-12 series, rated short-circuit withstand (4s) is 16kA to 40kA, with peak withstand of 40kA to 100kA[reference:93]. Rated short-circuit breaking current is up to 50kA[reference:94].
Q10: What are the insulation levels for high voltage switchgear?
A: For 12kV systems: power frequency withstand (1min) 24kV, 32kV, or 42kV; lightning impulse withstand (peak) 40kV, 60kV, or 75kV[reference:95]. Higher insulation levels are available for 24kV and 40.5kV systems.
Q11: What protection levels (IP ratings) are available?
A: Enclosure protection: IP4X (protected against solid objects >1mm)[reference:96][reference:97]. Breaker compartment (door open): IP2X (protected against solid objects >12.5mm)[reference:98].
Q12: What is the "five-protection" (五防) interlocking system?
A: The "five-protection" interlocking system prevents five types of misoperation[reference:99][reference:100]: (1) Prevents closing with earthing switch closed; (2) Prevents opening with load; (3) Prevents live entry into the breaker compartment; (4) Prevents closing the earthing switch when the circuit breaker is in the working position; and (5) Prevents opening the rear door while the earthing switch is open.
Q13: What circuit breakers are compatible with KYN series switchgear?
A: Compatible vacuum circuit breakers include ZN63A (VS1), VD4, ZN21, 3AH, VB2, and VEP[reference:101]. Vacuum contactors such as VC7 are also available[reference:102].
Q14: What types of trucks are available for KYN switchgear?
A: Available trucks include: Circuit breaker truck — main switching device; PT (voltage transformer) truck — voltage measurement and control; Metering truck — energy metering; Isolation truck — circuit isolation; and Station transformer truck — auxiliary power supply[reference:103].
Q15: What are the environmental requirements for HV switchgear installation?
A: Installation requirements include[reference:104]: Ambient temperature — -15°C to +40°C (daily avg ≤ +35°C); Relative humidity — daily avg ≤95%, monthly avg ≤90%; Altitude — ≤1000m (standard, up to 4000m with derating); Seismic resistance — ≤8 degrees; Environment — no fire/explosion hazard, no severe pollution or chemical corrosion.
Q16: Can high voltage switchgear be used at high altitudes?
A: Yes. Our HV switchgear can be specially designed for high-altitude installations. For altitudes above 1000m, the insulation level must be derated due to reduced air dielectric strength[reference:105][reference:106]. We offer solutions up to 4000m with enhanced insulation design[reference:107].
Q17: What is the difference between fixed and withdrawable switchgear?
A: Fixed switchgear has permanently installed components — more economical but requires power outage for maintenance. Withdrawable switchgear (KYN series) has removable circuit breaker trucks — allows hot-swappable replacement, higher flexibility, and better fault isolation[reference:108]. KYN series are withdrawable by design.
Q18: What tests are performed on high voltage switchgear before delivery?
A: We conduct comprehensive quality tests including: (1) Dielectric test — power frequency and lightning impulse withstand; (2) Short-circuit withstand test — verifying dynamic and thermal stability; (3) Temperature rise test — verifying thermal performance; (4) Mechanical operation test — verifying switch mechanisms; (5) Protection level test — verifying IP rating; and (6) Functional tests — verifying all protection and interlocking functions.
Q19: Do you support EPC projects with technical documentation?
A: Yes. We provide full technical support for EPC projects, including datasheets, type test reports, factory acceptance tests (FAT), material traceability documentation, shop drawings, one-line diagrams, and custom design based on project power distribution requirements and specifications. We are a trusted partner for global EPC contractors in power, petrochemical, oil & gas, and infrastructure sectors.
Q20: Can you provide custom high voltage switchgear configurations?
A: Yes. We offer fully customized HV switchgear solutions including custom voltage ratings, current ratings, number of circuits, protection levels, enclosure sizes, circuit breaker brands (ABB, Schneider, Siemens, etc.), and special markings. Our engineering team works closely with EPC contractors to develop switchgear that meets specific project technical requirements, load conditions, and installation constraints.
Send your project specification, power distribution requirements, or one-line diagram. Our engineering team will reply with a customized solution, BOM & datasheet within 24 hours.
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