What is a primary loop What is a secondary loop Ask for answers

In the power system, electrical equipment is usually divided into primary equipment and secondary equipment according to its role. Primary equipment refers to electrical equipment directly used for the production, transmission and distribution of electric energy, including generators and power transformers.

Circuit breakers, disconnectors.

Busbars, power cables and transmission lines are the main body of the power system. Secondary equipment is a low-voltage electrical equipment used to monitor, control, measure, regulate and protect the working conditions of the power system and primary equipment, including measuring instruments, control of primary equipment, operation monitoring signals, automatic monitoring systems and relay protection.

and safety automatic devices, communication equipment, etc. The electrical circuit composed of the secondary equipment connected together according to certain functional requirements is collectively referred to as the secondary wiring or the secondary circuit, which is an indispensable and important part of ensuring the safe production, economic operation and reliable power supply of the power system. ]

An electrical circuit in which primary equipment is connected to each other to form an electrical circuit for power generation, transmission, distribution, or other production, which is called a primary circuit or primary wiring.

The electrical circuit that is connected by secondary equipment to form monitoring, controlling, regulating and protecting primary equipment is called secondary circuit.

Explanation in the dictionary:

In the electrical system, the circuit is composed of the secondary winding of the transformer, the measuring and monitoring instrument, the relay, the automatic device, etc., through the control cable. It is used to control, protect, regulate, measure and monitor the working conditions of each parameter and each component in the primary circuit.

The circuit used to monitor the electrical connection of the meter, control operation signal, relay protection and automatic device is called the secondary circuit or secondary wiring.

The equipment that directly produces, transmits, distributes and uses electrical energy is called primary equipment, which mainly includes the following aspects:

1. Equipment for the production and conversion of electric energy; For example, a generator that converts mechanical energy into electrical energy, a transformer that converts voltage and transmits electrical energy, and an electric motor that converts electrical energy into mechanical energy.

2. Switchgear for turning on and off circuits. Such as high and low voltage circuit breakers, load switches, fuses, isolation switches, contactors, magnetic starters, etc.

3. Protect the electrical. For example, reactors to limit short-circuit currents, lightning arresters to defend against overvoltage, etc.

4. Current-carrying conductor. Such as soft and hard conductors and cables for transmitting electrical energy.

5. a grounding device.

Auxiliary equipment that monitors, measures, controls, protects, and regulates primary equipment is called secondary equipment.

1 Measuring meter 2 Insulation monitoring device.

3 Control and signaling devices.

4. Relay protection and automatic devices.

5 DC power supply equipment 6 High frequency damper.

To put it simply, the second is relative to the first time, the general power industry will be high-voltage equipment and circuits that can not be directly touched into a device and a primary circuit, such as high-voltage lines, high-voltage transformers, etc., because it cannot be directly measured and monitored, so it is necessary to use voltage and current transformers to turn it into low-voltage and low-current access monitoring instruments or protection devices, such as voltage, ammeter, watt-hour meter, and control device for primary equipment, these equipment are called secondary equipment, The corresponding control and protection circuits are referred to as secondary circuits. The explanation is relatively coarse, because it is in the vernacular! In addition, the so-called "secondary" literally means that it cannot be monitored and controlled at one time, and must be realized by other equipment.

Weak current circuit, usually within 400V AC or 220V DC.

Primary circuit refers to the electrical equipment directly used for the production, transmission and distribution of electric energy, including generators, power transformers, circuit breakers, disconnectors, bus bars, power cables and transmission lines, etc., which constitute the main body of the power system.

The electrical circuit that is connected to each other by the secondary circuits and constitutes the monitoring, controlling, regulating and protecting of the primary equipment is called the secondary circuit.

Extended Materials. An electric energy production and consumption system composed of power generation, transmission, transformation, distribution and consumption.

Its function is to convert the primary energy in nature into electrical energy through power generation power devices, and then transfer the electric energy to various users through transmission, transformation and distribution.

The difference between a secondary loop and a primary loop is that the definition is different.

Difference: The electrical circuit that is connected to each other by electrical primary equipment to form power generation, transmission, distribution or other production processes is called a primary circuit or primary wiring system. The secondary circuit refers to the electrical circuit that is connected by the secondary equipment to form the monitoring, control, regulation and protection of the primary equipment, which is called the secondary circuit or the secondary wiring system.

Electrical equipment: Electrical equipment is a general term for generators, transformers, power lines, circuit breakers and other equipment in the power system. The important role played by electricity in our life and production cannot be ignored, and it brings us great convenience and becomes an important energy source in our production and life.

The most critical factor in a power plant that allows power to run and deliver properly is the electrical equipment.

Introduction to the secondary circuit:

1. Secondary circuits refer to all low-voltage circuits such as measurement circuits, relay protection circuits, switch control and signal circuits, operating power circuits, circuit breakers and electrical locking circuits of disconnectors.

2. The secondary equipment is connected to each other to form an electrical circuit for monitoring, controlling, regulating and protecting the primary equipment.

3. The secondary circuit is a circuit connected by the secondary winding of the transformer, the measuring and monitoring instrument, the relay, the automatic device, etc. in the electrical system through the control cable.

Primary equipment (also known as main equipment) 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. Secondary equipment is the equipment that controls, regulates, protects and monitors the primary equipment, including control tools, relay protection and automatic devices, measuring instruments, signal instruments, etc.

You may also understand it this way: as long as the high-current equipment connected on the three wires (UVW L1L2L3 ABC) is a primary circuit, and the other (low-current) connected equipment is a secondary circuit, which plays the main role of transmission and transformation, and the secondary is the primary protection, monitoring, control, regulation, and so on

Secondary circuit: low-voltage circuit.