Welcome to HZNRKJ!

Technical Encyclopedia

Switch

Working principle of overcurrent relay

          Before introducing the over-current relay in detail, it is recommended that you use the company's 94X microcomputer protection device , the series of computer protection device is the current protection, voltage protection is the basic configuration of digital protection unit, suitable for 35kV and below Voltage level of the small current grounding system, as a variety of electrical equipment and lines of the main protection or backup protection; the price of more than 1,000 yuan, a set of high voltage cabinet generally require a definite time overcurrent relay and an inverse time overcurrent relay, two Add up and a 94X microcomputer protection device price is almost the same, it can be said that the series of computer protection device is to replace the traditional over-current relay the best choice.

94X computer protection device.jpg

Overcurrent relay introduction

          Overcurrent relay is a kind of protection device used to protect the main equipment such as motor and transformer. The product has the characteristics of definite time and inverse time. When the main equipment or power transmission and distribution system has overload and overcurrent or short circuit fault , Over-current relay in accordance with the predetermined period of reliable operation or signal, cut off the fault part, so as to protect the main equipment and transmission and distribution system purposes.

Over-current relay works:

          Over-current relay is mainly through the over-current protection action to achieve the protection of components. Over-current relay through its own measurement of components to determine whether the current through the line exceeds the standard time relay as a delay element, with an appropriate delay to ensure the device action is selective, while the signal relay is used to send a protective action signal. During normal operation, the overcurrent relay and the time relay are both disconnected. When the fault or the overcurrent in the protection zone is over, the current relay is activated and the time relay is started through its contact. After a predetermined delay, the time relay contacts The point is closed, the circuit breaker is tripped, the circuit breaker is tripped, the fault line is cut off, the signal relay is activated, the signal plate is dropped, and the light or sound signal is switched on.

Common over-current relay model

          JGL-10 over-current relay with inverse-time characteristics for generators, transformers and power distribution system relay protection device. The product can overload the device or short circuit, according to a predetermined time limit reliable action, send a signal or remove the fault part. The main product is the use of digital switching current setting value, intuitive and convenient, no need to change the setting test, the setting range of 2-9.9A level difference of 0.1A; high precision, low power consumption, fast action, high return coefficient. 

          JSL-10 over-current relay for urban and rural power network power lines, transformer protection , motor overload and short circuit protection. The relay for the integrated circuit static relay, the use of digital switching current setting value, intuitive and convenient, changing the setting without inspection, setting range of 2.0-9.9A level difference of 0.1A; high precision, low power consumption, fast action time, high return coefficient , Its structure and GL series overcurrent relay the same. 

          The GL-10 Overcurrent Relay is a type used in relay protection circuits with inverse time characteristics applied to main equipment such as motors, transformers and power transmission and distribution systems. When the main equipment or power transmission and distribution system overload and short circuit failure occurs, the relay can be a predetermined time limit reliable action or signal, cut off the fault part, to ensure that the main equipment and power transmission and distribution system security.

Online Service

jibaonanrui

209585994

209585994

SHARE