I. Product Overview

High - voltage switchgear is a core complete set of equipment used in high - voltage power systems with mainstream voltage levels of 10 kV - 35 kV. It is responsible for receiving, distributing, controlling, and protecting against faults in electrical energy. The cabinet body is welded from high - strength cold - rolled steel plates or 304 stainless steel. Internally, it integrates key components such as high - voltage circuit breakers, disconnectors, current transformers, voltage transformers, and lightning arresters. It features excellent high - voltage insulation performance (air insulation or SF6 gas insulation), a high safety protection level (standard IP4X, customizable to IP54 for outdoor scenarios), a modular structure (convenient for maintenance and capacity expansion), and stability against electrodynamic forces. It can reliably interrupt high - voltage fault currents, ensuring the safe and stable operation of high - voltage power grids and downstream equipment.

II. Core Functions

1. High - Voltage Power Distribution: It receives high - voltage electrical energy transmitted from upstream substations and precisely distributes it to high - voltage loads such as high - voltage motors and transformers through internal busbars and branch circuits, supporting the high - voltage power supply requirements of factories, substations, and large - scale infrastructure.
2. High - Voltage Circuit Control: By using high - voltage circuit breakers and disconnectors, it enables the on - off control of high - voltage circuits. It supports local manual operation or remote automatic control in conjunction with SCADA (Supervisory Control And Data Acquisition) systems, meeting the flexible scheduling needs of unattended substations and other scenarios.
3. High - Voltage Safety Protection: It provides short - circuit protection (capable of rapidly interrupting fault currents of 16 kA - 50 kA), over - current protection (achieved through the collaboration of transformers and relay protection devices), grounding protection (preventing the expansion of high - voltage grounding accidents), and over - voltage protection (lightning arresters suppress lightning strikes or switching over - voltages). It serves as the core barrier for the safe operation of high - voltage power systems.
4. Status Monitoring and Early Warning: It is equipped with high - voltage live displays (indicating the live status of the cabinet body to prevent misoperation) and current/voltage transformers (for real - time collection of high - voltage parameters). Some intelligent models support online monitoring of insulation status and circuit breaker mechanical characteristics. Data can be uploaded to a monitoring platform via Ethernet to provide early warnings of potential faults and reduce operation and maintenance costs.

III. Applicable Scenarios

1. Power Systems: 10 kV/35 kV substations and regional power grid switching stations serve as key nodes for the transfer and control of high - voltage electrical energy, ensuring the stability of power grid supply.
2. Industrial Sector: Large - scale steel mills, chemical plants, and building material factories, etc., use it to provide high - voltage power distribution and control for high - voltage motors and large compressors.
3. Infrastructure: Urban rail transit (as part of subway traction substations), large data centers (high - voltage incoming cabinets supporting dual - circuit power supply guarantees), airports, and ports' high - voltage power distribution systems.
4. Commercial and Civil Applications: High - voltage incoming cabinets in super - tall buildings (such as skyscrapers) connect the urban high - voltage power grid with the building's step - down transformers, laying the foundation for the overall power supply of the building.

IV. Operation and Maintenance

1. Installation Requirements: Installation must be carried out by a professional team with high - voltage electrician qualifications and high - voltage switchgear installation qualifications. The horizontal installation error of the cabinet body should be ≤ 1 mm/m, and the grounding system must be reliable (grounding resistance ≤ 0.5 Ω). The installation environment should be dry (relative humidity ≤ 85%), free of corrosive gases, and away from vibration sources (to avoid affecting the insulation performance of high - voltage components).
2. Daily Maintenance:
   • Monthly Checks: Check the status of high - voltage live displays and the integrity of cabinet door seals (to prevent dust from entering and affecting insulation).
   • Quarterly Inspections: Detect whether there are creepage marks on the surface of insulation components and whether there is overheating at busbar joints (using an infrared thermometer).
   • Annual Tests: Conduct mechanical characteristic tests on circuit breakers and insulation resistance tests (using a 2500 V megger, with an insulation resistance value ≥ 1000 MΩ).
3. Fault Handling: If a circuit breaker trips, first determine the fault type (short - circuit, over - current, etc.) through the relay protection device, troubleshoot faults in the high - voltage line or downstream equipment, and then manually close the circuit breaker after confirming that the fault has been eliminated (it is strictly prohibited to force the circuit breaker to close with a fault). If insulation components are found to be damaged, immediately cut off the power supply and replace them with components of the same specifications. After replacement, conduct an insulation test again, and only put them back into operation after passing the test