CG5-10Q Indoor High-Voltage Live Display Device Sensor

1. Product Overview

The CG5-10Q series indoor high-voltage live display device sensor is designed for indoor high-voltage switchgear and ring main units with a rated voltage of 10 kV (12 kV) and rated frequency of 50 Hz. Cast from epoxy resin under vacuum, the sensor works with DXN series live-line indicators. Using the capacitive voltage-dividing principle, it extracts a signal voltage from the high-voltage live circuit to indicate the live status in real time. When paired with an electromagnetic lock, it provides forced interlocking of cabinet doors, effectively preventing accidental entry into live compartments and erroneous earthing operations, thereby protecting personnel and equipment.

2. Key Selling Points

· Capacitive Voltage Dividing, Passive and Reliable: Extracts signal from the high-voltage circuit via capacitive division. No external power supply required; simple structure and maintenance-free long-term operation.

· One-Piece Epoxy Resin Casting: Vacuum-cast as a single unit with excellent insulation performance, arc resistance, moisture resistance, and flame retardancy for harsh in-cabinet environments.

· Forced Interlocking, Safety Redundancy: As long as the high-voltage circuit is live, the electromagnetic lock remains engaged even if the display and interlock circuits fail simultaneously, fundamentally preventing misoperation.

· Multiple Height Options: Available in 95×125, 130, 140, 145, and 170 mm heights to fit different cabinet types and installation spaces.

· Easy Installation: Standard mounting holes (M8/M10/M16) on both upper and lower flanges; direct fixation in the cabinet with no complex commissioning required.

· Standard Interface, Universal Compatibility: Output signal is compatible with DXN series live-line indicators and can directly replace same-model legacy products.

3. Product Features

· Vacuum-cast epoxy resin with high insulation strength and low partial discharge;

· Shed (skirt) structure increases creepage distance and improves pollution resistance;

· Built-in high-voltage capacitive divider for stable signal and strong anti-interference;

· Signal output terminal at the bottom for convenient and reliable wiring;

· Compact and lightweight for easy installation and replacement;

· Complies with DL/T 538 and GB/T 11022 standards.

4. Working Principle & System Composition

4.1 Working Principle

Inside the sensor is a high-voltage coupling capacitor (voltage-dividing capacitor core rod). When the high-voltage circuit is energized, the capacitive divider extracts a low-voltage signal proportional to the primary voltage and sends it to the live-line indicator. The indicator determines whether the circuit is live based on the signal voltage, driving the LED display and interlock relay. The sensor also supplies operating power to the indicator and electromagnetic lock, achieving "live indication and live interlock" simultaneously.

4.2 System Composition

· High-Voltage Sensor (CG5-10Q): Mounted on the three-phase high-voltage busbar or circuit breaker inside the switchgear, one per phase, responsible for capacitive voltage division and signal extraction.

· Live-Line Indicator (DXN Series): Mounted on the switchgear panel, receives sensor signals, displays three-phase live status via LEDs, and features self-test and interlock functions.

· Electromagnetic Lock (Optional): Installed on the cabinet door or earthing switch operating mechanism; receives the interlock signal and forcibly locks when the circuit is live to prevent misoperation.

5. Applications

5.1 Compatible Switchgear Types

· Metal-clad withdrawable switchgear (e.g., KYN28)

· Ring Main Units (RMU)

· Fixed-type high-voltage switchgear

· High-voltage metering cubicles and PT cubicles

· Gas-insulated switchgear (SF6 cabinets)

5.2 Installation Locations

· On busbars in the busbar compartment (one per phase)

· Upper and lower contact sides of circuit breakers

· Cable inlet ends

· Live side of disconnectors

5.3 Industry Scenarios

· Power plants, substations, and switching stations

· Industrial distribution rooms (metallurgy, chemical, manufacturing)

· Data centers and IDC facilities

· Commercial complexes and office building distribution

· Rail transit power supply systems

· Renewable energy stations (PV, wind, energy storage)

6. Functional Highlights

· Real-time live status indication: three-phase independent display with clear LEDs;

· Forced interlock: locks cabinet doors and earthing switches when live, preventing entry into live compartments;

· Fail-safe interlock: even if the display circuit fails, interlock remains active as long as the primary side is live;

· Self-test function: the indicator periodically self-tests to ensure the indication circuit is healthy;

· Wide temperature operation: stable from -25°C to +40°C (down to -35°C in special regions);

· Maintenance-free design: passive structure with no moving parts, fully sealed casting, lifetime maintenance-free.

7. Customer Value

· Electric Shock Prevention & Personnel Safety: Clearly indicates the live status of high-voltage circuits, warning maintenance personnel to stay away from hazards and preventing electric shock accidents at the source.

· Misoperation Prevention & Equipment Safety: The live interlock prevents dangerous operations such as switching under load and earthing while energized, protecting equipment from damage.

· Reduced O&M Cost: Passive and maintenance-free; no periodic battery replacement or calibration needed. Install once and run long-term.

· Standard & Universal, Easy Replacement: Compatible with mainstream DXN indicators; legacy cabinet retrofits can directly replace same-model sensors without drilling or rewiring.

· Regulatory Compliance: Meets the power industry "Five Preventions" (Wu Fang) requirements and is a mandatory safety component for high-voltage switchgear.

8. Technical Specifications