Medium Voltage 11kv Indoor Vcb Panel

The Usune Medium Voltage 11kV Indoor VCB Panel (KYN28 series) is an armored, withdrawable, metal-enclosed switchgear designed for the safe and efficient reception, distribution, control, and protection of medium-voltage power grids. It is a core distribution unit in the power system, ensuring stable system operation under both normal and fault conditions.

- Applicable Systems: 3.6～12kV / 24kV Three-phase AC 50/60Hz
- Standards: IEC 62271-200, GB 3906, DL/T 404
- Core Structure: Armored metal enclosure, removable trolley structure
- Protection Rating: Cabinet IP4X, Interior IP2X

Low voltage switchgear

Medium voltage switchgear

Model and Technical Parameters

1. Model Series

2. Main Technical Parameters

Structure and Compartment Design

The Medium Voltage 11kV Indoor Vcb Panel uses steel plates to separate five independent grounded metal compartments, effectively suppressing the spread of fault arcs and ensuring personal safety:

1. Circuit Breaker Compartment: Built-in removable vacuum circuit breaker trolley (VS1/ZN63A, VD4, etc.), equipped with mechanical interlocking, allowing the trolley to switch between working, testing, and disconnected positions.

2. Busbar Compartment: Contains main busbars and branch busbars, completely isolated from other compartments to prevent fault propagation.

3. Cable Compartment: Equipped with current transformers (CTs), voltage transformers (PTs), grounding switches, cable terminals, and surge arresters for cable connection and protection.

4. Control Instrument Compartment: Houses protective relays, instruments, control switches, indicator lights, and secondary circuits for monitoring and operation.

5. Pressure Relief Channel: Features a pressure relief device at the top to safely release arc pressure and gas in case of internal faults, preventing damage to the cabinet and personnel injury.

Core Features and Advantages

1. Removable Handcart Design: The Medium Voltage 11kV Indoor Vcb Panel handcart is fully interchangeable, allowing for rapid inspection and replacement without requiring a complete busbar outage, significantly reducing downtime.
2. Comprehensive Five-Prevention Mechanical Interlocking:
- Prevents accidental opening and closing of circuit breakers
- Prevents pushing or pulling the circuit breaker trolley under load
- Prevents accidental closing of the grounding switch while energized
- Prevents energizing the grounding switch when it is in the closed position
- Prevents accidental entry into a energized compartment

3. Fully Enclosed Independent Compartments: Metal partitions separate functional areas, effectively suppressing arc propagation and mutual interference.

4. Front Operation and Maintenance: All operations and maintenance can be completed from the front of the cabinet, saving installation space.

5. High Reliability and High Safety: Meets international mainstream standards, with high insulation levels and strong fault resistance.

6. Modular Design: Can be flexibly configured as an incoming line cabinet, outgoing line cabinet, metering cabinet, busbar section cabinet, etc.

Main Application Scenarios

1. Incoming Line Cabinet (Power Grid Reception)

2. Outgoing Line Cabinet (Power Distribution to Loads, Motors, and Transformers)

3. Motor Control Cabinet (Large Motor Start-up, Stopping, and Protection)

4. Transformer Feeder Cabinet (Distribution Transformer Protection)

5. Busbar Sectioning Cabinet (Busbar Sectioning and Automatic Transfer Switching)

Actual Application Cases

Case 1: A Large Petrochemical Industrial Park in Jiangsu Province

Project Challenges: The petrochemical plant has extremely high requirements for power supply continuity, safety, and fault tolerance, requiring long-term stable operation.
Solution: 36 Usune KYN28A-12 vacuum circuit breaker cabinets were used for system incoming and outgoing lines and large motor control.
Operating Results: Continuous and stable operation for over 8 years without major faults, effectively achieving overload and short-circuit protection, ensuring uninterrupted production.

Case 2: A Commercial Complex in Zhejiang Province

Project Challenges: Limited space in the high-rise building's power distribution room, requiring compact, safe, and easy-to-maintain equipment.
Solution: Configure 22 Usune KYN28A-12 switchgear units with a front-accessible structure.
Operating Results: High space utilization, convenient maintenance, and reliable protection for critical loads such as building lighting, air conditioning, and fire protection.

Project Reference

Cas-space Rocket Launch Project

Test Report

FAQs

Q1: What is the difference between KYN28A-12 and KYN28-24?

A: The main difference is the rated voltage level: KYN28A-12 is suitable for 12kV (10kV class) systems, while KYN28-24 is suitable for 24kV (20kV class) systems. Both are designed according to their respective voltage levels in terms of insulation distance, insulation component selection, and internal component rated parameters.

Q2: Can Usune customize this vacuum circuit breaker cabinet for export projects?

A: Yes. As a professional manufacturer, Usune can adjust parameters according to project requirements to meet different regional standards such as IEC and ANSI, and can customize circuit breaker models, protective relays, and dimensions. 

Q3: What are the service life and maintenance cycle of the Medium Voltage 11kV Indoor Vcb Panel?

A: Under normal maintenance conditions, the designed service life is 20-30 years. Routine maintenance mainly includes insulation testing, circuit breaker characteristic checks, and relay calibration. The withdrawable trolley structure allows for quick replacement, significantly reducing maintenance downtime.