Fixed Pattern Switchgear

This product is the XGN2-12 indoor box-type fixed metal-enclosed high-voltage switchgear, designed and manufactured strictly in accordance with GB3906-2020 "3.6kV～40.5kV AC Metal-Enclosed Switchgear and Controlgear" and DL/T404 "Technical Conditions for Ordering Indoor High-Voltage Switchgear" national standards. The equipment is a three-phase AC 50Hz, 12kV rated voltage indoor fixed power distribution switchgear, integrating four core units: a GN30 rotary high-voltage disconnector, a high-voltage vacuum circuit breaker, an intelligent microcomputer integrated protection device, and a high-voltage grounding switch (grounding knife) . It possesses reliable functions such as opening and closing, short-circuit protection, overload protection, grounding protection, electrical interlocking, and condition monitoring.

The cabinet adopts a fully enclosed metal structure, featuring high overall rigidity, a high protection level, and excellent insulation performance. It is equipped with a comprehensive five-prevention interlocking mechanism to prevent serious electrical accidents such as accidental opening or closing, operating disconnect switches under load, grounding live wires, and accidental entry into energized compartments. The equipment is compact, stable in operation, easy to maintain, and has a high safety factor. It is widely used in 10kV high-voltage power distribution systems in industrial and mining enterprises, residential communities, commercial complexes, hospitals, schools, substations, and distribution rooms for power reception, distribution, protection, and control. It is a mainstream classic high-voltage switchgear in power transmission and distribution systems.

XGN 2 - 12

• X: Box-shaped structure
• G: Fixed switchgear
• N: Indoor use
• 2: Design serial number (second-generation improved version)
• 12: Rated maximum operating voltage 12kV

This switchgear is divided into four independent compartments: a busbar compartment, a circuit breaker compartment, a cable compartment, and an instrument and relay compartment. The compartments are clearly defined, with separation of strong and weak current circuits and reliable insulation protection. The core components of the cabinet include a GN30 disconnector switch, a vacuum circuit breaker, a microprocessor-based integrated protection device, and a high-voltage grounding switch. These, along with a comprehensive interlocking system, ensure safe, reliable, and intelligent operation of high-voltage power distribution.

■ GN30 Rotary High-Voltage Disconnect Switch

This cabinet comes standard with a GN30-12 series indoor rotary high-voltage disconnector , which is the core component for high-voltage isolation within the cabinet. Unlike traditional disconnectors, it features a rotary opening and closing structure, making it easy to operate, providing a large insulation distance, and ensuring high visibility of the break point. The equipment is primarily used to isolate power supplies in high-voltage circuits under no-load conditions, creating a clear and visible disconnect point. This provides a safe insulation barrier for equipment maintenance and line upkeep, making it a core component for ensuring safety during high-voltage electrical work.

Key features : Sufficient insulation creepage distance, excellent withstand voltage performance, effectively resisting 12kV system overvoltage; high structural mechanical strength, not easily deformed, reliable contact, and low heat generation; equipped with a mechanical interlocking mechanism, strictly following the logic of "the disconnecting switch can only be operated after the circuit breaker is opened", preventing serious accidents such as opening and closing the disconnecting switch under load; the rotating conductor is reliably isolated in the open state, fully meeting the high-voltage maintenance safety specifications.

■ High-voltage vacuum circuit breaker

The main switch of the cabinet adopts an indoor high-voltage vacuum circuit breaker , which is the core actuator for circuit switching and fault protection. It uses a vacuum arc-extinguishing chamber, which is oil-free, gas-free, has a fast arc-extinguishing speed, stable insulation performance, and a long service life. It is suitable for high-frequency operation and long-term continuous operation. The circuit breaker is fixedly installed in the circuit breaker compartment, with a stable structure and strong seismic resistance. It can realize the connection and disconnection of normal load current, as well as the rapid interruption of system short-circuit faults.

Key features : The arc-extinguishing medium is high vacuum, ensuring complete arc extinguishing with no residual arc and preventing reignition; it features both electric and manual operation, adaptable to automatic control and emergency manual operation; it boasts stable mechanical characteristics and precise action, enabling rapid response to microprocessor-based protection trip commands; it has the ability to quickly clear overload and short-circuit faults, effectively protecting downstream lines, transformers, and electrical equipment, and ensuring the safe operation of the high-voltage system.

■ Intelligent Microcomputer Integrated Protection Device

The instrument room is equipped with a high-voltage microcomputer integrated protection and control device , which is the core of intelligent control and protection for the entire switchgear. It replaces the traditional electromagnetic relay protection and integrates measurement, protection, control, communication, alarm and recording functions into one, realizing intelligent unattended operation and maintenance of high-voltage circuits.

Core features :

1. Comprehensive protection functions : Equipped with a full set of protections including instantaneous overcurrent protection, time-limited instantaneous overcurrent protection, overcurrent protection, overload protection, zero-sequence protection, overvoltage and undervoltage protection, etc. In case of a fault, the circuit breaker is accurately and quickly tripped to cut off the faulty circuit.

2. Real-time monitoring and metering : Real-time acquisition of operating parameters such as three-phase voltage, three-phase current, active power, reactive power, and frequency, with the equipment operating status displayed intuitively on the screen.

3. Event logging and alarm : Automatically stores fault time, fault type, and action parameters, with simultaneous audible and visual alarms, facilitating quick troubleshooting by maintenance personnel.

4. Remote communication function : Standard communication interface supports remote telemetry, remote signaling, remote control and remote adjustment, and can be connected to the power distribution back-end system to realize intelligent remote monitoring and centralized management.

5. Logic self-locking protection : Built-in professional power distribution protection logic to prevent false operation and failure to operate, suitable for various high-voltage load protection scenarios such as 10kV lines, transformers, and motors.

■ High-voltage grounding switch (grounding knife)

The cabinet's cable compartment is equipped with a dedicated high-voltage grounding switch , an essential safety protection device for high-voltage system maintenance, and has rated short-circuit and short-time withstand capability. When power is off for line or equipment maintenance, the equipment reliably grounds the cable side and line side, releasing residual charge and dissipating induced voltage, thus preventing electric shock accidents caused by residual voltage, induced current, or sudden power restoration.

Core features : It has strict mechanical interlocking logic, and can only be closed and grounded after the circuit breaker is opened, the disconnecting switch is opened, and the line is completely de-energized ; the grounding contacts have tight contact and reliable conduction, and can withstand the system short-circuit grounding current; the structure is simple to operate and the action is reliable. It is the core guarantee device for high-voltage maintenance operations and safe grounding, and fully complies with the power safety work regulations.

■ Five-Prevention Interlocking Safety System

The cabinet is equipped with a complete set of mechanical and electrical dual five-proof interlocking functions, providing full-process mandatory protection against misoperation: 1. Preventing accidental opening or closing of circuit breakers; 2. Preventing the opening or closing of isolating switches under load; 3. Preventing the closing of grounding switches while energized; 4. Preventing the closing of power supply with the grounding wire connected; 5. Preventing accidental entry into energized compartments. The interlocking logic of each operating mechanism is rigorous and the operation is reliable, eliminating all high-voltage misoperation accidents from a hardware perspective, ensuring extremely high safety.

1. 10kV high-voltage power distribution, transmission, and control systems for industrial and mining enterprises and industrial parks;

2. High-voltage power distribution rooms in residential communities, commercial complexes, office buildings, hotels, hospitals, schools, and other public buildings;

3. High and low voltage power distribution systems in substations, switching stations, and power distribution rooms;

4. High-voltage power supply systems for critical loads in fire pump rooms, pump stations, rail transit, and municipal engineering projects;

5. All indoor high-voltage power distribution scenarios requiring 10kV power distribution, fault protection, safety isolation, and maintenance grounding.

■ Installation Environment Requirements

1. The equipment is for indoor use only and is installed in a dry, ventilated, and clean high-voltage power distribution room, free from corrosive gases, flammable and explosive dust, and severe vibration.

2. The foundation channel steel should be level and flat, the cabinet should be firmly fixed to the ground, and the cabinets should be neatly arranged and vertically compliant.

3. The cabinet is reliably grounded with a grounding resistance of ≤4Ω. The grounding of the cabinet, grounding switch, and secondary circuit is complete and independent.

4. Ensure the temperature and humidity in the power distribution room are suitable, and take measures to prevent water damage, moisture, dust, and small animals to ensure the long-term stable operation of the equipment.

■ Pre-installation inspection

1. Check that the cabinet exterior is intact, without deformation, and the paint is complete; check that the compartment doors, locks, and interlocking mechanisms are flexible and reliable.

2. Verify that the model parameters of the GN30 disconnector, vacuum circuit breaker, grounding switch, and microprocessor protection device match the design requirements;

3. Check that the primary contacts are in good contact, free from oxidation and deformation, and that the secondary wiring is secure and clearly labeled;

4. The five-proof interlock function was tested to be complete and reliable, and the operation of each mechanism was smooth and without any lag or failure.

5. Before powering on, complete insulation tests and withstand voltage tests to confirm that the equipment's insulation performance meets the standards and that there are no risks of short circuits or leakage.

■ Operating Procedures

1. Normal power supply operation : Close the cabinet door → Close the grounding switch (open after test) → Open the grounding switch → Close the GN30 disconnecting switch → Energy storage vacuum circuit breaker → Close the circuit breaker to supply power, and the equipment will operate normally under load.

2. Normal power outage operation : Circuit breaker trips → Disconnects load → Opens GN30 isolating switch → After confirming no power, closes grounding switch → Opens cabinet door for maintenance.

3. Grounding maintenance operation : After the equipment is completely de-energized and tested for voltage, the grounding switch must be reliably closed before maintenance work can be carried out inside the cabinet and on the lines.

4. Microcomputer protection operation : Keep the protection device in operation daily. It is strictly forbidden to arbitrarily disable the protection or change the settings. After a fault trip, check the device fault record and restore power only after troubleshooting.

5. All operations must be performed by a certified high-voltage electrician, strictly following the switching operation ticket system, and strictly prohibiting any violations of regulations.

1. Daily inspection: Check daily that the cabinet instruments and microcomputer protection displays are normal, with no alarms, no abnormal noises, no overheating, no signs of discharge, and the cabinet door is tightly closed;

2. Monthly maintenance: Clean the dust inside the cabinet, check the contact status of the GN30 disconnector switch contacts and circuit breaker contacts, tighten the wiring terminals, and test the flexibility of the interlocking mechanism;

3. Quarterly maintenance: Verify the microcomputer protection settings, tripping and alarm functions, test the grounding switch closing conduction performance, and check the status of the vacuum circuit breaker arc-extinguishing chamber and the energy storage reliability of the operating mechanism;

4. Annual maintenance: Conduct insulation withstand voltage tests, test the insulation performance of the primary circuit, perform comprehensive maintenance on the operating mechanism, replace aging auxiliary parts, and conduct simulated fault transmission tests;

5. Equipment that has been out of service for a long time should be powered on regularly to dehumidify and check its protection functions to prevent the mechanism from jamming, the insulation from getting damp, and the parts from aging and failing.

1. Equipment installation, commissioning, switching operations, maintenance and repair must be carried out by certified high-voltage electricians, and high-voltage electrical safety operating procedures and switching operation systems must be strictly followed.

2. During the operation of the equipment while it is energized, it is strictly forbidden to open the cabinet door, touch any live parts inside the cabinet, disable the five-proof interlock, or modify the mechanism without authorization;

3. Strictly follow the switching operation sequence of "break the circuit breaker first, then open the disconnecting switch; close the disconnecting switch first, then close the circuit breaker," and strictly prohibit operating the disconnecting switch under load;

4. When inspecting and repairing lines and equipment, the following safety procedures must be followed: power off, voltage test, grounding, tagging, and installation of barriers . Work can only be carried out after the grounding switch has been reliably closed.

5. It is strictly forbidden to change the microcomputer protection settings, disable the protection function, or short-circuit the interlocking circuit without authorization, and to prevent the equipment from operating without protection.

6. Regularly check the reliability of the five-prevention interlocking, grounding switch, and circuit breaker operating mechanism to prevent misoperation accidents caused by interlock failure.

This product is manufactured and inspected in strict accordance with national high-voltage switchgear standards. Before leaving the factory, it undergoes comprehensive tests including insulation withstand voltage, mechanical operation, five-proof interlocking, protection transmission, and breaking capacity to ensure performance compliance. The equipment comes with a 24-month warranty, and core components (vacuum circuit breaker, microprocessor protection, disconnecting switch, and grounding switch) are covered by the original manufacturer's warranty. During the warranty period, the manufacturer will repair or replace parts free of charge for equipment failures not caused by human error or force majeure. Failures caused by unauthorized modification, improper operation, overload operation, human-caused damage, harsh environmental conditions, or natural disasters are not covered by the warranty.