Products

Introduction to the device

The REJ-600 series microcomputer protection device is a digital protection unit that integrates multiple functions such as monitoring, protection, human-machine interface, and communication interface, with voltage and current protection as the basic configuration. It is suitable for small current grounding systems in power systems, industrial and mining enterprises, and civil building distribution with voltage levels of 35kV and below in China. It serves as the main and backup protection for various electrical equipment and lines.

The device adopts a 32-bit microprocessor and utilizes digital processing technology to achieve various protections, replacing traditional electromagnetic relays and realizing digitalization and intelligence of protection.

Measurement and Control Unit Configuration Table

Configuration Name

Configuration function

Protection function

Overcurrent Section I Protection, Overcurrent Section II Protection, Overcurrent Section III Protection, Inverse Time Overcurrent Protection, Overcurrent Acceleration Protection, Overload Protection, Zero Sequence Section I Protection, Zero Sequence Section II Protection, Zero Sequence Acceleration Protection, Low Voltage Protection, Overvoltage Protection, Primary Recloser, Secondary Recloser, Tertiary Recloser, Recloser Lock, Heavy Gas Protection, Light Gas Protection, Overtemperature Protection, Overtemperature Protection

Measurement and control function

Ua、Ub、Uc、3U0、IA、IB、IC、Ia、Ib、Ic、3I0、f、P、Q、COS

Remote signaling 6 channels

Remote control opening and closing of circuit breakers

hardware resource

6-way switch input

4-channel switch output: alarm, accident, trip, closing

Analog input: Ua Ub、Uc、3U0、Ia、Ib、Ic、IA、IB、IC、3I0

1 RS485 communication channel

Product Features

★ Adopting a 32-bit MCU microcontroller chip with built-in large capacity RAM and Flash, the device has strong data processing, logic processing, and information storage capabilities, high reliability, and fast running speed, ensuring stable operation in harsh environments.

★ High precision sampling is adopted, with data collection of 32 points per cycle, ensuring the accuracy of sampling and protection calculation.

★ Adopting an LCD display screen with a Chinese friendly interface; Real time display of various data and operating status, easy to use and debug.

The structural design supports vertical and horizontal installation, and the hardware board adopts plug-in installation, which supports quick and convenient on-site replacement and maintenance.

★ Communication protocols IEC101 and MODBUS are optional, equipped with RS-485, economical and convenient networking, and can directly communicate with microcomputer monitoring or communication management machines.

★ The protection functions are fully configured, and each protection function can be flexibly activated or deactivated. The export configuration is flexible and convenient.

The analog input, switch input, power input, and communication interface parts adopt anti-interference measures such as transformer isolation, optoelectronic isolation, and TVS protection, making the device more resistant to interference.

★ Highly reliable electromagnetic compatibility design, the circuit board adopts surface mount technology and multi-layer board process, and selects fast transient voltage suppression devices to make the device have strong electromagnetic compatibility capability.

Protection classification:

Backup power self switching device

Microcomputer circuit protection relay

Microcomputer harmonic elimination protection relay

Microcomputer capacitor protection relay

Microcomputer motor (reactor) protection relay