High-voltage switchgear is used in the power system power generation, transmission, distribution, power conversion and consumption of electrical equipment for the role of on-off, control or protection, mainly used for 3.6kV ~ 550kV electrical products, the structure of the cabinet, the main busbar room, the circuit breaker room, the cable room, the relays and instrumentation room:
1 Cabinet materials
Cabinet materials are numerous, welded cabinets with cold-rolled steel or angle steel, assembled cabinets with zinc-aluminum deposited steel or galvanized steel, and with stainless steel or aluminum plate, the cabinet is composed of the shell, electrical components (including insulation), a variety of mechanisms, secondary terminals and connecting wires, and so on.
2, the main bus room
The bus room is arranged in the upper part of the back of the switchgear cabinet for the installation of three-phase high-voltage AC buses and branch buses to realize the static contacts connected to the use. All busbars are molded with insulating sleeves. When the busbar crosses the switchgear partition, it is fixed with a busbar sleeve. If there is an internal fault arc, it can limit the accident to spread to neighboring cabinets and safeguard the mechanical strength of the busbar.
3, circuit breaker room
Also known as the handcart room, the circuit breaker room is installed with a specific guide rail for the circuit breaker handcart within the slide and work. The handcart can move between the working position and test position. The bulkhead (flap) for the static contacts is mounted on the back wall of the handcart chamber. Handcart from the test position to move to the working position in the process, the partition board automatically open, the opposite direction of movement of the handcart is completely composite, so as to ensure that the operator does not touch the electrified body.
4, cable room
Cable room is installed with current transformer, grounding switch, lightning arrester (over-voltage protector) and cable and other ancillary equipment, and at the bottom of which is equipped with open slit removable aluminum plate to ensure the convenience of on-site construction.
5, relay instrumentation room
Relay room panel, the installation of microcomputer protection devices, operating handles, protection of the export pressure plate, meters, status indicators (or status display), etc.; relay room, the installation of terminal blocks, microcomputer protection control circuit DC power switch, microcomputer protection DC power supply, energy storage motor power switch (DC or AC), and the special requirements of secondary equipment. Special requirements of the secondary equipment.
Two, high-voltage switchgear which electrical components
High-voltage switchgear there are many electrical components, generally can be divided into two categories of primary and secondary electrical components:
1, switchgear commonly used in the primary electrical components (the main circuit equipment)
Mainly current transformers, voltage transformers, grounding switches, lightning arrester (capacitance-absorbing device), Isolation switches, high-voltage circuit breakers, high-voltage contactors, high-voltage fuses, transformers, high-voltage charged displays, insulation (wall casing, contact box, insulators, insulation heat-shrinkable sheath), high-voltage reactor, load switch, high-voltage single-phase shunt capacitors and so on.
2, switchgear commonly used in the main secondary electrical components
Secondary electrical components refers to the primary equipment for monitoring, control, measurement, adjustment and protection of the equipment, mainly relays, meters, ammeters, ammeters, voltmeters, power meters, power factor tables, frequency tables, fuses, air switches, switching switches, signal lamps, resistors, push buttons, microprocessor integrated protection devices.
These are the most popular products in the world.