What is the secondary equipment of the power system

Secondary equipment is relay protection and automatic control equipment.

The equipment of the power system, the first is the equipment that directly bears high voltage, such as transformers, circuit breakers, etc., and the secondary equipment is isolated, and the voltage is very low, which is generally used for relay protection or automatic control of primary equipment. In general, it is mainly a relay protection device.

Your question is a bit vague, as I understand it:

Secondary equipment refers to the equipment that controls, protects, monitors and measures the work of primary equipment. Such as measuring instruments, relays, operating switches, buttons, automatic control equipment, computers, signal equipment, control cables and some power supply devices. The circuit that connects the secondary equipment is called the secondary line.

In the secondary line, DC is generally used for communication testing equipment, such as PABX, PDH, MUX, generally for 48V DC power supply, and AC line is used for AC equipment.

Power secondary equipment is an auxiliary equipment for monitoring, measuring, controlling, protecting and regulating the primary equipment in the power system.

Electrical secondary equipment mainly includes:

Appearance; control and signaling elements;

relay protection device;

operation, signal power circuits;

control cables and connecting wires;

signaling elements that emit sounds;

Terminal blocks and fuses, etc.

Electrical primary equipment refers to high-voltage electrical equipment that is directly used in the production process of producing, transmitting and distributing electrical energy. It includes generators, transformers, circuit breakers, disconnectors, automatic switches, contactors, knife switches, busbars, transmission lines, power cables, reactors, motors, etc.

Electrical secondary equipment refers to the low-voltage electrical equipment required to monitor, control, regulate and protect the work of primary equipment, and to provide operating conditions or production command signals for operation and maintenance personnel. Such as fuses, buttons, indicator lights, control switches, relays, control cables, instruments, signal equipment, automatic devices, etc.

The secondary has voltmeter, ammeter, power meter, electric energy meter, etc.

Secondary equipment includes voltmeter, ammeter, power meter, and electric energy meter to measure electrical parameters in the circuit, and insulation monitoring device. Relay protection and automatic devices, such as relays, automatic devices, etc., are used to monitor the operation status of the primary system, quickly respond to abnormalities and accidents, and then act on the circuit breaker for protection and control.

Planning of the power system:

It is mainly based on the characteristics and resource conditions of various power generation modes to decide what form of power station (hydropower, thermal power, nuclear power, etc.) to add, as well as the capacity and number of generator sets. Due to its high utilization rate, it is advisable to choose high-efficiency units suitable for long-term operation, such as nuclear power units and large-capacity, high-parameter thermal power units, etc., to reduce fuel costs.

Due to its low annual utilization rate, it is advisable to choose units with short start-up time and low investment due to low annual utilization rate, such as gas turbine units. As for the hydropower units, they should be as full as possible during the wet season to bear the base load of the system; In the dry season, due to the limited amount of water, there is a peak load.

The secondary equipment of the power system is relative to the primary equipment, and we can call the electrical equipment with low voltage of 380V and below as secondary equipment. Of course, the primary equipment is the equipment above 3kv. It can also be said that those auxiliary equipment used to monitor, measure, and control primary equipment are called secondary equipment.

Low-voltage equipment below the high-voltage switch, such as equipment used for monitoring, measurement, protection, and control, is secondary equipment.

Mainly weak current, protection system, communication system.

A system in which devices are connected and work together is a primary system. Auxiliary systems such as relay protection and safety automation, dispatching automation and communication are secondary systems.

The primary system is the main body of the power system, which is the equipment that directly produces, transmits and distributes electric energy, including generators, power transformers, circuit breakers, disconnectors, power buss, power cables and transmission lines.

The secondary system is the equipment that controls, regulates, protects and monitors the primary equipment, which includes control tools, relay protection and automatic devices, measuring instruments, signal instruments, etc.

The secondary equipment obtains electrical contact with the primary equipment through the voltage transformer and the current transformer. The primary device and the loops to which it is connected are called primary loops. The electrical circuit in which secondary equipment is connected according to certain rules to achieve a certain technical requirement is called a secondary circuit.

Electrical primary equipment: refers to electrical equipment directly used for production, transformation, transmission, channeling, distribution and use of electric energy. For example:

Generators, transformers, circuit breakers, disconnectors, automatic switches, contactors, knife switches, busbars, transmission lines, power cables, reactors, motors, grounding, lightning arresters, filters, insulators, etc.

Electrical secondary equipment refers to the low-voltage electrical equipment required to monitor, control, regulate and protect the work of primary equipment, and to provide operating conditions or production command signals for operation and maintenance personnel. Such as:

Fuses, control switches, relays, control cables, meters, signal equipment, automatic devices, etc.

The secondary equipment is basically carried with weak current. X0D X0A Another point to note is that primary equipment is also divided into primary side and secondary side, such as transformer and transformer. But all in all, it is still a primary device.

x0d x0a above is my personal opinion.

The primary power distribution system refers to the operating system for direct current and alternating current used to control the voltage in the distribution box.

The secondary distribution and taking system is a system composed of relay protection, safety automatic control, system communication, dispatching automation, DCS automatic control system, etc.

The differences are as follows: 1. The composition is different:

Primary distribution is a system composed of generators, transmission lines, transformers, circuit breakers and other equipment for power generation, transmission, substation, distribution and other equipment.

The secondary configuration is a system composed of relay protection, safety automatic control, system communication, scheduling automation, DCS automatic control system, etc.

2. The functional equipment is different

Primary distribution refers to high-voltage electrical equipment that is directly used in the production process of producing, transporting and distributing electrical energy. Secondary configuration refers to the low-voltage electrical equipment required to monitor, control, regulate and protect the work of primary equipment, and to provide operating conditions or production command signals for operation and maintenance personnel.

3. Different roles:

Primary distribution is to send the electric energy emitted by the generator to the distribution system through the power transmission and transformation equipment, and then distribute the electric energy to the users by the distribution line.

The secondary matching is to realize the contact monitoring and control between people and the primary system, so that the primary system can operate safely and economically.

Encyclopedia - a primary system.

Encyclopedia - Secondary power distribution system.