The classification and use of phase -sequential protection relay, and how to use the use of the carrier protection circuit?

Broken phase and phase -order protection relay is commonly known as phase -sequential protector; it is mainly used to protect whether the phase sequences in the line are correct. When the phase sequence is connected, the phase and the phase protection relay will cut off the control loop, disconnect the main circuit, and then pass through the main circuit, and then pass the main circuit. The indicator light is displayed in the fault, so what is the problem that people can observe intuitively? And quickly solve the problem.

Broken phase and phase -order protection relay

Broken phase and phase -sequential protection relay consists of the ontology and the base. It can be seen in the ontology model and the working voltage. It can also be viewed through the indicator light. use.

Common protection relay is divided into old and new versions. The difference between the new version and the old version is on the indicator light.

New and old broken phase protection relay structure diagram

The old version of the indicator comes out, and the light is bright to red and the light extermination. When the three -phase voltage is normal and the light is bright, it means that the phase -sequential relay detects the correctness of the connection line. Normally work, when the indicator light is extinguished, that is, the phase sequence of the phase protector detects the phase sequence error of the connection line, and is in a state of alarm. At this time, the control loop cannot be connected normally, so the main circuit must be disconnected. The role.

The new version of the indicator light is inside the phase sequence protector. There are two indications: red and green. When the three -phase voltage is normal, the indicator light is green, indicating that the phase sequence protection relay detects the correct phase of the connection line, and the phase sequence protector is detected. When working normally, when the light is bright, it is the phase sequence error that the connection line is detected in the phase -sequential protector. At this time, the control loop cannot be connected normally, so the main circuit must be disconnected. When the indicator light is extinguished At this time, you need to check whether the three -phase voltage of the access phase -sequential protector is normal and whether the line is connected.

Disglement and phase -order protection relay when working normally, indicator light status

断相与相序保护继电器的分类与用途,以及如何接线保护电路使用?

The three -phase electric A, B, C are connected in the phase -sequential protector, respectively. 5 and 6 are regular contacts, and 7 and 8 are normally closed contacts. Some phase -order protectors are represented by TA TB TC. Among them, TCs are the public end, TC and TA are regular contacts, and TC and TB are normally closed contacts.

断相与相序保护继电器的分类与用途,以及如何接线保护电路使用?

Broken phase and phase -order protector wiring diagram

How does the phase -sequential protector be wiring, and how to use it often opens and closely closed contacts?

断相与相序保护继电器的分类与用途,以及如何接线保护电路使用?

1.2.3 connected to the three -phase electricity of the end, the 5 and 6 frequently open contacts are connected in the control loop, and the 7 and 8 normally closed contacts and indicator light connection connection control circuits are used to use the phase sequence error error The state is displayed through the indicator light. When the phase sequence is correct, 5 and 6 are closed, the control loop is connected, the connection between the contact contactor is connected, the main circuit constituted a circuit, the motor is electric, and the 7 and 8 contacts are disconnected at this time. Bright. When the phase sequence is wrong, 5 and 6 are disconnected, the control circuit cannot constitute a complete circuit, in a disconnected state, and the main circuit is also disconnected to protect the circuit. At this time, 7 and 8 are still in a closed state, so the indicator light is electric, and it is in a bright state. Through the indicator light, you can intuitively see that the line is wrong, so as to detect and adjust the line.

断相与相序保护继电器的分类与用途,以及如何接线保护电路使用?

Broken phase and phase -order protector wiring diagram

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