Detailed Introduction to Richge Technology Indoor High-Voltage Grounding Switch

    Based on Richge Technology's business foundation in the field of high-voltage switchgear accessories (previously focusing on high-voltage insulation parts, grounding switch components, etc.), its indoor high-voltage grounding switch products are positioned as core safety equipment for power systems with voltage levels of 12kV~40.5kV. They are mainly used in indoor substations, power distribution rooms and high-voltage switchgear matching to meet the grounding protection needs during equipment maintenance. The products comply with industry standards such as T/ZZB 2173-2021 "12kV～40.5kV Indoor High-Voltage AC Grounding Switch". The following is a detailed introduction from the core dimensions of the product:

I. Product Overview and Core Positioning

    Richge indoor high-voltage grounding switch is a mechanical safety grounding device, classified as an isolating switch. Its core function is to form a reliable grounding circuit between the equipment to be maintained and the power grid during the maintenance of high-voltage equipment (such as circuit breakers, transformers, switchgear), release residual charges and provide an "obvious disconnection point" to prevent personal electric shock or equipment damage caused by unexpected power supply.

• Voltage coverage: 12kV, 24kV, 40.5kV (adapting to mainstream medium-voltage indoor power systems);

• Frequency adaptation: 50Hz (compatible with domestic power system standards);

• Core advantages: Form technical synergy with Richge high-voltage switch accessories (such as insulating pillars, operating mechanisms), with compact structure, flexible operation, and resistance to harsh environments (adapting to indoor complex scenarios such as dust, temperature and humidity fluctuations).

II. Key Technical Parameters (Complying with T/ZZB 2173-2021 Standard)

    According to the voltage level classification, the core technical parameters are shown in the following table, which also meet the basic requirements of GB/T 1985-2014 "High-Voltage AC Isolating Switches and Grounding Switches":

III. Structural Design and Working Principle

3.1 Core Structure (Modular Design for Easy Installation and Maintenance)

    Referring to the mature industry architecture and combining with Richge's accessory process advantages, the product is mainly composed of the following components:

• Bracket: Formed by cold bending and welding of thin steel plates, with surface anti-corrosion treatment (galvanizing/spraying) to ensure structural strength;

• Grounding Knife Assembly: T2 red copper cold-drawn forming, contact silver plating layer hardness ≥HV120 (reducing contact resistance and improving corrosion resistance);

• Static Contact: With flange knife-edge design, cooperating with disc spring to achieve reliable contact and avoid loose heating;

• Operating Mechanism: Supports manual/electric dual modes (electric model includes motor drive unit), integrated with pressure spring energy storage structure;

• Insulation Components: Epoxy resin insulators adopt APG automatic compression molding process (high insulation strength, low partial discharge);

• Intelligent Control Module (Optional): Includes motor stall protection (≥5 times rated current), operation time limit protection, voltage fluctuation protection (80%-120% rated value), protection grade IP3X;

• Auxiliary Components: Conductive sleeve (insulation isolation), flexible connection (compensating installation error), position sensor (feedback opening and closing status).

3.2 Working Principle (Driven by Pressure Spring Energy Storage, Independent of Manual Operation Speed)

(1) Closing Operation

1. Manually/electrically drive the operating mechanism, torque is transmitted to the main shaft, overcoming the resistance torque to drive the crank arm to rotate;

2. The grounding knife operating rod passes through the pressure spring dead point, and the pressure spring releases energy instantaneously to push the grounding knife to close quickly;

3. After closing in place, the grounding knife is in close contact with the static contact flange through the disc spring to form a reliable grounding circuit.

(2) Opening Operation

1. The operating mechanism applies reverse torque, and the main shaft overcomes the main torque and spring force to drive the crank arm to rotate in reverse;

2. The grounding knife pressure spring passes through the dead point again to complete energy storage (preparing for the next closing);

3. After opening in place, the break opening distance meets the standard requirements, forming obvious electrical isolation.

IV. Core Functions and Application Scenarios

4.1 Core Safety Functions

1. Forced Interlock Protection: Realize mechanical/electrical interlock with the main switch of high-voltage switchgear (when the main switch is not opened, the grounding switch cannot be closed; when the grounding switch is closed, the main switch cannot be closed) to prevent misoperation;

2. Residual Charge Release: Quickly discharge residual charges in the equipment after grounding to avoid electrostatic shock during maintenance;

3. Short-Circuit Making Capacity: Class E2 making performance can deal with sudden short-circuit faults during maintenance to avoid equipment burnout;

4. State Visualization: Equipped with mechanical position indication (clear opening/closing marks), optional live display device (complying with DL408-91 regulations).

4.2 Typical Application Scenarios

• Indoor Substations: Used with 12kV~40.5kV circuit breakers and isolating switches for busbar and transformer maintenance grounding;

• High-Voltage Switchgear Matching: Form "high-low voltage synergy" with Richge low-voltage switchgear accessories, adapting to MNS, GCS and other cabinets, as maintenance grounding components for outgoing cabinets and metering cabinets;

• Industrial Power Distribution Systems: Maintenance protection for high-voltage equipment (such as high-voltage motors, rectifier cabinets) in large factories and mine-owned power stations;

• New Energy Scenarios: Safety grounding of indoor power distribution devices (such as 35kV switchgear) in photovoltaic/wind power booster stations.

V. Installation and Maintenance Points

5.1 Key Installation Requirements

1. Foundation Adaptation: The levelness error of the installation surface ≤1mm/m, and the grounding loop resistance ≤0.5Ω (must be reliably connected to the station grounding grid);

2. Interlock Cooperation: Ensure that the interlock mechanism with the main switch of the switchgear operates smoothly without jamming (it is recommended to use Richge original interlock accessories for better compatibility);

3. Electrical Wiring: The control line connection of the electric model must comply with the voltage level (such as AC220V/DC220V), and the tightening torque of the wiring terminals meets the requirements of the manual;

4. Acceptance Test: After installation, it is necessary to test the opening and closing asynchronism, loop resistance and insulation performance (power frequency withstand voltage, partial discharge test).

5.2 Regular Maintenance and Troubleshooting

(1) Maintenance Cycle and Content

(2) Common Troubleshooting

• Closing Jamming: Check whether the connection between the crank arm and the main shaft is loose, or whether the contact is deformed (deformed parts need to be replaced);

• Excessive Contact Resistance: Polish the contact oxide layer, supplement silver plating (or replace the contact assembly);

• Electric Operation Failure: Check whether the motor stall protection is triggered (the controller needs to be reset), or whether the drive gear is worn;

• Excessive Partial Discharge: Clean the oil stain on the surface of insulation parts, check whether the insulator has cracks (replace the insulator if necessary).

VI. Standard Compliance and Quality Commitment

6.1 Compliant Standards

• Group Standard: T/ZZB 2173-2021 "12kV～40.5kV Indoor High-Voltage AC Grounding Switch";

• National Standard: GB/T 1985-2014 "High-Voltage AC Isolating Switches and Grounding Switches", GB/T 11022-2020 "Common Technical Requirements for High-Voltage Switchgear and Control Equipment Standards";

• Test Standard: GB/T 14598.26-2015 "Electromagnetic Compatibility - Testing and Measurement Techniques - Electrostatic Discharge Immunity Test" (EMC test), salt spray test (three-proof verification).

6.2 Quality Commitment

• Product Warranty Period: 1 year (excluding human damage or force majeure);

• Life Guarantee: When the mechanical life reaches Class M2 (10,000 times), the key performance still meets the standard requirements;

• Service Support: Provide installation guidance, maintenance training and spare parts supply (support can be obtained through Richge official website or customer service).

VII. Ways to Obtain Detailed Information

    To obtain the complete product manual of Richge Technology indoor high-voltage grounding switch (including specific model parameters, installation drawings, test reports), you can use the following methods:

1. Visit Richge official website (www.richgeswitchgear.com) and query in the "High-Voltage Products" or "Technical Download" section;

2. Contact Richge sales department (WhatsAPP: +86 189 5893 8078) and explain the requirements (such as voltage level, whether electric control is needed);

3. Send an email to Richge customer service email to apply for a customized technical solution.