Model | Rated | Specified Cantilever Load | Structure | Minimum Dry Arc Distance | Minimum | Critical Impulse | Power Frequency Flashover Voltage (Wet /Dry ) |
(kV) | (kN) | (mm) | (mm) | (mm) | (kV) | (kV) | |
FZSW-230/18.5 | 230 | 18.5 | 2278±30 | 1920 | 6530 | 1160/1250 | 630/720 |
Core:Epoxy & Glass Fiber, Acid-Resistant Type.Diameter: Φ90 mm.
Weather sheds: HTV Silicone.
End-fitting:Forged Steel or cast steel, Hot Dip Galvanized.Minimum thickness of the galvanization: 86μm.
Corona Ring: Aluminum alloy.
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what is substation
The substation is the intermediate link between power plants and users. The main equipment of the substation is the transformer and the high-voltage side, which plays the role of converting voltage to transmit and distribute electric energy.
According to its position in the power system, substations can be divided into the following four categories:
(1) Hub substation
Located at the pivot point of the power system, connecting several parts of the high-voltage and medium-voltage power systems, and bringing together multiple power sources, the substation with a voltage of 330-500 kV is called a hub substation. A complete power outage will cause the system to be disconnected or even paralyzed.
(2) Intermediate substation
The high-voltage side is mainly based on the exchange flow, which plays the role of system exchange power, or makes long-distance transmission lines segmented, and generally gathers 2~3 power supplies with a voltage of 220~330 kV, and at the same time reduces the voltage to supply local electricity. Such a substation mainly plays the role of an intermediate link, so it is called an intermediate substation. A power outage across the entire site will cause the regional power grid to be disconnected.
(3)Regional substation
The high-voltage side voltage is generally 110 ~ 220 kV. It is a substation that mainly supplies power to regional users. This is the main substation of a region or city. After the total power outage, only the area was interrupted.
(4)Terminal substation
At the terminal of the transmission line, close to the load point, the high-voltage side voltage is mostly 110 kV. The substation that directly supplies power to users after voltage reduction is the terminal substation. After all power outages, only users suffer losses.
Classification and basic functions of electrical equipment in power supply and distribution systems
To meet production needs, electrical equipment is installed in power plants and substations. Equipment that produces, transmits, distributes, and uses electrical energy is usually called primary equipment. In addition to the main equipment generators and transformers, primary equipment also has many other equipment, collectively referred to as power distribution equipment. Power distribution equipment can be divided into the following five categories:
(1) Switching appliances
Equipment responsible for connecting and disconnecting circuits. It mainly includes high and low voltage circuit breakers, high voltage isolating switches, low voltage knife switches and high and low voltage fuses, etc.
(2)Current limiting electrical appliances
Limit the short-circuit current in the power system in order to select lightweight switching appliances and reduce the cross-section of the current-carrying conductor. It is mainly a current-limiting reactor and a two-voltage low-voltage split winding transformer.
(3) Transformer
Equipment that converts the high voltage and high current of the primary wiring system into standard low voltage and small current, and provides current and voltage signals to secondary measurement, control and automatic devices. It mainly includes current transformers and voltage transformers.
(4) Conductors and insulators (insulation bushings)
Conductors that connect various electrical equipment and transmit electrical energy; insulators that support, fix or suspend bare current-carrying conductors to insulate them between phases and to ground. It mainly includes busbars, overhead lines, cables, support insulators, suspension insulators, wall bushings, equipment lead bushings, etc.
(5) Lightning protection and grounding equipment
Equipment that prevents overvoltage from damaging the insulation of equipment mainly includes lightning rods and arresters.
Whether it is the working grounding of the neutral point of the power system or the protective grounding to protect personal safety, they are all connected to the grounding device buried in the ground.
A circuit composed of primary equipment is called a primary circuit (or primary system). In addition, equipment that measures, controls, monitors and protects primary equipment is called secondary equipment. They include:
Instrument transformers, such as voltage transformers and current transformers, can reduce the voltage or current in the circuit to a lower value and supply it to instruments and protection devices.
Measuring meters, such as voltmeter, ammeter, power factor meter, etc., are used to measure parameter values in the circuit.
Relay protection and automatic devices. These devices can quickly respond to abnormal conditions and monitor and adjust them. For example, they can trip a circuit breaker and remove the fault.
DC power supply equipment, including DC generator sets, batteries, etc., supply DC power for protection and accident lighting.
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