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KYN61-4O.5 Armored Withdrawable AC Metal-Enclosed Switchgear
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Basic Overview
This KYN61-40.5 type high-voltage switchgear, a core electrical equipment widely applied in 35kV power distribution systems. It’s designed for receiving, distributing, and protecting high-voltage electrical energy, typically used in power plants, substations, industrial and mining enterprises, and large-scale commercial buildings.
The KYN61-40.5 cabinet adopts a metal-clad, compartmentalized structure(complying with GB3906-2020 standards), which separates functional areas (such as the circuit breaker compartment, busbar compartment, cable compartment, and secondary control compartment) with grounded metal partitions. This design effectively prevents the spread of faults between compartments and enhances operational safety. The cabinet in the image is an "incoming line cabinet" (responsible for connecting the external power supply to the distribution system), marked with "ANN1" (cabinet number) and "1250A" (rated current of the main circuit).
Application Scenarios
As an incoming line cabinet, it’s the "entry point" of the 35kV power distribution system: it connects the power supply (e.g., from a substation) to the busbar, distributes power to outgoing line cabinets, and provides protection for the entire system. It’s suitable for:
- Medium and large-scale industrial plants (e.g., steel mills, chemical plants) that require stable high-voltage power supply.
- Urban substations (as part of the 35kV/10kV transformation system).
- Large commercial complexes (to meet the high-power electricity demand of multiple equipment).
In summary, the KYN61-40.5 (1250A) incoming line cabinet is a high-reliability, safe high-voltage switchgear with standardized parameters and a modular structure. It balances operational convenience and fault protection, making it a key device in modern 35kV power distribution networks.
Technical Parameters
1. Rated Voltage: 40.5kV (adapted to 35kV power systems, with a maximum operating voltage of 46kV).
2. Rated Frequency: 50Hz (compatible with standard power grids in China and most regions).
3. Rated Current:
- Main circuit (marked "1250A"): 1250A (supports long-term operation under this current; optional specifications include 630A, 1000A, 1600A, etc.).
- Auxiliary circuit: 220V/380V (for control, protection, and monitoring components).
4. Rated Short-Time Withstand Current: ≥25kA (duration: 4s; able to withstand short-circuit impact within the specified time).
5. Rated Peak Withstand Current: ≥63kA (resists instantaneous peak current generated by short circuits).
6. Insulation Level:
- Power frequency withstand voltage (1min): 95kV (between live parts and ground; between different phases).
- Lightning impulse withstand voltage: 185kV (protects against overvoltage caused by lightning strikes).
7. IP Protection Grade: IP4X (prevents solid foreign objects ≥1mm from entering; suitable for indoor installation environments).
8. Operating Temperature: -10℃ to +40℃ (normal operation; derating required when exceeding this range).
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FAQ
Find answers to common questions about KYN61-40.5 medium-voltage switchgear, including rated current, short-circuit capacity, vacuum circuit breakers, interlocking, protection and project customization.
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What is the rated voltage of the KYN61-40.5 switchgear?
The KYN61-40.5 switchgear is designed for **40.5kV-class three-phase AC 50Hz power systems**. It is commonly used in power plants, substations, industrial facilities, mining projects, and other medium-voltage distribution systems for receiving, distributing, controlling, protecting, and monitoring electrical energy.
What rated current can the KYN61-40.5 switchgear support?
The rated current depends on the project design, busbar configuration, and selected circuit breaker. Different current ratings can be configured according to: * Incoming feeder current * Outgoing feeder current * Main busbar rating * Transformer or load capacity * Short-circuit level Please provide your required current rating and single-line diagram for technical confirmation.
What short-circuit breaking capacity can be provided?
The short-circuit breaking capacity depends on the selected vacuum circuit breaker and system fault level. The switchgear can be configured according to the required: * Rated short-circuit breaking current * Short-time withstand current * Peak withstand current * Short-circuit duration Please provide these values in your technical specification or tender document.
What type of circuit breaker is used in the KYN61-40.5?
The KYN61-40.5 can be configured with a suitable **withdrawable vacuum circuit breaker**. The breaker rating, operating mechanism, control voltage, auxiliary contacts, and protection functions can be selected according to the project requirements. If a specific brand or model is required, please include it in your RFQ.
What is the advantage of the withdrawable design?
The withdrawable design allows the circuit breaker truck to be moved between different operating positions, such as: * Service position * Test position * Isolated position This makes inspection, maintenance, testing, and replacement more convenient and helps improve operating flexibility.
What safety interlocking functions are available?
The switchgear can be designed with mechanical and electrical interlocking to reduce the risk of incorrect operation. Typical interlocking may coordinate: * Circuit breaker * Disconnecting position * Earthing switch * Breaker truck position * Cable compartment * Cabinet door The final interlocking logic should follow the project operating and safety requirements.
Can CTs, VTs, protection relays, and metering devices be customized?
Yes. The cabinet can be configured with: * Current transformers (CT) * Voltage transformers (VT) * Protection relays * Multifunction meters * Energy meters * Control switches * Indication devices * Alarm circuits * Communication devices The exact configuration should follow the single-line diagram and protection philosophy.