This article is mainly about the related introduction of the secondary equipment, and focuses on the principle and type of the secondary equipment for a detailed elaboration.
Secondary equipmentPower secondary equipment is auxiliary equipment for monitoring, measuring, controlling, protecting, and regulating the primary equipment in the power system. [1] That is, equipment that is not directly connected with electric energy.
Internal equipment 1. Measuring meters, such as voltmeters, ammeters, power meters, and electric energy meters are used to measure electrical parameters in the circuit. 2. Insulation monitoring device. 3. Control and signal device. 4. Relay protection and automatic devices, such as relays, automatic devices, etc., are used to monitor the operating conditions of the primary system, quickly respond to abnormalities and accidents, and then act on the circuit breaker to perform protection control. 5. DC power supply equipment, such as battery packs, DC generators, silicon rectifiers, etc., supply DC power supplies for control and protection, DC loads, and power for emergency lighting. 6. High frequency wave trap. 7. Equipped with self-input devices and so on.
What are the secondary equipmentThe equipment that monitors, measures, controls, protects and regulates primary equipment is called secondary equipment.
What are the main secondary equipment:
(1) Measuring meter. Used to monitor and measure the current, voltage, power, etc. of the circuit.
(2) Insulation monitoring device. Used to monitor the insulation status of AC and DC power grids.
(3) Control and signal devices. Control mainly refers to the use of manual or automatic methods to realize the closing and tripping of circuit breakers in power distribution devices through operating circuits.
(4) Relay protection and automatic device.
(5) DC power supply equipment. Including battery packs and silicon rectifiers. It is used as a DC power supply for the operation, signal, relay protection and automatic devices of switching appliances, as well as a backup power supply for emergency lighting and DC motors.
(6) Plug flow coil (also known as high-frequency wave trap). It is an indispensable part of power carrier communication equipment. It forms a power line high-frequency communication channel with coupling capacitors, combined filters, high-frequency cables, and high-frequency communication devices. The plug current coil plays the role of preventing high-frequency current from leaking to the substation or branch line and reducing the high-frequency energy loss.
(7) Comprehensive automation equipment.
How to wire secondary equipmentThe secondary circuit is also called the auxiliary circuit, the secondary circuit: all low-voltage circuits such as the measurement circuit, the relay protection circuit, the switch control and signal circuit, the operation power circuit, the electrical blocking circuit of the circuit breaker and the isolating switch.
The secondary equipment is connected to each other to form an electrical circuit that monitors, controls, regulates and protects the primary equipment is called the secondary circuit. It is a circuit formed by the secondary winding of the transformer, measuring and monitoring instruments, relays, automatic devices, etc. through the control cable in the electrical system.
It is used to control, protect, adjust, measure and monitor the working conditions of various parameters and components in the primary loop. The electrical connection loops that are used to monitor and measure meters, control operating signals, relay protection, and automatic devices are called secondary loops or secondary wiring.
Therefore, the secondary cable trench is used for the laying of the secondary circuit. At the same time, if the primary circuit and the secondary circuit are laid separately, it will help avoid the anti-interference ability of the secondary circuit and facilitate maintenance.
Schematic diagram of secondary control system
DC screen is the abbreviation of DC operation power system. The general name is Smart Maintenance-free DC Power Supply Panel, or DC Panel for short, and the general model is GZDW.
Simply put, a DC screen is a device that provides a stable DC power supply. (When the input has a 380V power supply, it is directly converted to 220V. When there is no input (mains and backup power), it is directly converted to battery power supply-DC 220V: in fact, it can be said to be an industrial emergency power supply)
Tips
How to prevent and take measures for electrical equipment in high temperature weather:
1. Take heat insulation measures to cool some metal equipment with excessive temperature. Use the existing conditions of the power distribution room to cool the metal equipment with excessive temperature by cooling fans, and use water cooling for cooling water to cool down.
2. Make use of all motor stoppages to fasten the main circuit components of some important equipment (such as circuit breakers, contactors, etc.) to prevent electrical contact with the surfaces of the two conductors from violent oxidation and significant increase in contact resistance, etc., to make the main circuit components contact Bad leads to electrical equipment failure, ensuring stable electrical contact and reducing electrical failure rate.
3. Regularly check the reactive power compensation device, improve the power factor to reduce equipment capacity and power loss, stabilize the voltage and improve the quality of power supply.
4. Strengthen post inspections, conduct regular inspections of on-site equipment, carefully make relevant records, and focus on observing equipment with excessive temperature. Regularly check on-site equipment to avoid malfunctions due to excessive equipment temperature.
Concluding remarks
This is the end of the related introduction about the secondary equipment. If there are any deficiencies, please correct me.
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