The Overall Structure of the Switchgear

The Overall Structure of the Switchgear (Take the center-mounted vacuum circuit breaker cabinet as an example)

Taking JYN2-10(Z) high voltage switchgear as an example, its structure can be divided into two parts: cabinet and hand car.Handcar for circuit breaker handcar, the main electrical components are circuit breaker (installed on the car), grounding switch and isolated static contact seat, etc.

The cabinet is divided into four independent compartments by grounded steel plates: bus room, handcart room, relay instrument room, and cable room. The rear and lower side of the cabinet becomes a cable room, in which cables and current transformers are installed. Above it is the main busbar room. There are partitions between the compartments to ensure safety during maintenance. In front of the cabinet are the relay room and the handcart room. Continue to work. By the propulsion mechanism, a trolley equipped with a circuit breaker moves back and forth on the guide rail. Pushing in can make the upper and lower isolated moving contacts of the circuit breaker insert into the isolated static contact base to complete the circuit connection; on the contrary, when the circuit breaker breaks the circuit, pull the trolley out to separate the moving and static contacts. , Forming an obvious isolation gap, which is equivalent to the role of an isolating switch. Using a dedicated carrier, the trolley equipped with circuit breakers can be easily pushed into or pulled out of the cabinet.

When the circuit breaker serious failure or damage, the same can use a special truck circuit breaker trolley pulled out of the cabinet body for maintenance.Can also replace the spare circuit breaker trolley, pushed into the cabinet body

2.1.1 Basic Requirements

(1) The design of high voltage switchgear should make the normal operation, monitoring and maintenance work of high voltage switchgear safe and convenient. The maintenance work includes: component overhaul, test, fault finding and treatment;

(2) For the rated parameters and the same structure and need to replace the components shall be interchangeable;

(3) For removable

The high voltage switchgear of the open parts shall be interchangeable if the rated parameters and structure of the removable parts are the same;

(4) it shall be checked according to local conditions of use;

(5) It shall strive to be technologically advanced and economically reasonable;

(6) The selected new products should have reliable test data and be qualified by the test.

2.1.2 Determination of the main loop scheme

The main circuit of high voltage switch cabinet is also called a line, it is according to the actual requirement of power system and power supply and distribution system, each model of main circuit scheme of high voltage switch cabinet has dozens of less, many hundreds of, usually includes the following categories: the ark, measuring tank, isolation, grounding handcart cupboard, capacitor cabinets, high-voltage electrical control cabinet (F – C ark), etc.

Switchgear main circuit scheme combination to consider the following issues :

(1) according to the primary system diagram and its primary loop working current size and control, protection, measurement and other requirements, select the corresponding main circuit scheme of the switch cabinet;

(2) Selection between incoming and outgoing line types and switchgear.