A complete high-voltage system consists of the following components:
1. Incoming switchgear (receives power from the high-voltage system, i.e., the source of the high-voltage system)
2. PT switchgear (provides busbar voltage signals for this section of the high-voltage system, enabling energy conversion and voltage protection)
3. Metering switchgear (calculates the energy used in this section of the high-voltage system for billing purposes; sometimes, this switchgear is not included in the system)
4. Outgoing switchgear (distributes power from the high-voltage system, i.e., transmits it to the next level)
5. Sectioning switchgear (interconnects and transmits power within the power system; this switchgear is not included in single-busbar systems)
6. Isolation switchgear (often used in conjunction with sectioning switchgear)
The high-voltage system diagram includes all information about the power supply and distribution plan, primarily including: the primary power distribution plan, key component names, switchgear dimensions, switchgear arrangement, and customer information.
Since different customers have different power supply and distribution plans, their system diagrams will vary.
The names and functions of the main components in the primary system diagram are as follows:
Vacuum circuit breaker: A circuit breaker has two main functions: control (activating or deactivating certain power equipment and lines based on power system operating needs) and protection (when a power equipment or line fails, relay protection devices are used to quickly disconnect the faulty part from the power system, ensuring normal operation of the undamaged portion of the power system).
Vacuum contactors: They function similarly to vacuum circuit breakers, but they can operate more frequently. Their mechanical lifespan typically reaches millions of cycles, compared to only 20,000 for vacuum circuit breakers. They have a lower rated current, typically only around 450A, so they are suitable for use with small-capacity motors or motor outputs. They are often used in conjunction with high-voltage fuses.
High-voltage fuses: High-voltage fuses are protective devices that heat up and melt, cutting off power. They are often used in conjunction with high-voltage contactors and are also used to protect loads such as instrument transformers and transformers.
Instrument transformer: An instrument transformer is a converter used to transmit electrical quantity information to measuring instruments, meters, and protection and control devices. It can be divided into current transformers (CT) and voltage transformers (PT).
Grounding switch: The grounding switch is mainly used for grounding protection during maintenance of high-voltage electrical appliances;
Lightning arrester: Lightning arrester is a protective device used to limit the amplitude of overvoltage and is connected in parallel between the protected device and the ground;
And many accessories are combined to form a complete high-pressure control system，Fully exert its role in the entire power system！
Post time: Aug-18-2025
