Digital Motor Protection Relay

Product catalog summary

Introduction
Digital motor protection relays are crucial for ensuring motor reliability and safety by detecting internal faults such as overcurrent, single-phase operation, grounding, bearing issues, and abnormal winding temperatures. They also monitor external conditions to prevent grid fluctuations and voltage surges from affecting the motor. These relays help maintain motor system stability and power grid reliability by isolating interference sources and preventing motor damage.

Measurement Function

Data recording and analysis
Variety of protection functions
Fault alarm and automatic power-off function
RS485 remote communication and control
Real-time motor operating status monitoring
Flexible configuration for specific needs

Applications

Automated industry
High voltage switchgear
Solar and wind energy systems
Power plants and power grid dispatching
Transmission towers and substations

Protection Functions
The PR series includes models PR201, PR202, PR203, PR240, and PR260, each offering various protection functions such as max start time, overload, overcurrent, phase loss, current imbalance, overvoltage, undervoltage, ground fault, and more. Some functions are optional or specific to certain models.

PR200 Series
The PR200 motor protection relay is designed for real-time monitoring of three-phase power lines for abnormal conditions and is suitable for motors below 690V/820A. It features a built-in 2-channel relay, high accuracy sample calculation, and optional RS485 communication interface.

PR240 Series
The PR240 relay supports motors less than 690V/820A and offers control operations like measurement, self-diagnosis, and field bus communication. It includes a dot matrix LCD display, built-in 4-channel relay, and optional RS485 communication interface.

PR260 Series
The PR260 relay is suitable for low-voltage motors with rated voltage less than 690V and current up to 820A. It supports Modbus-RTU communication and features 7-channel switch monitoring, real-time status monitoring, and various fault detection capabilities.

Technical Characteristics
All models operate within a power range of 85-265 VAC/DC, with power consumption under 10 VA. They are designed to withstand various environmental conditions and electrical tests, including electrostatic discharge and surge shock.

CT Selection Table
The document provides a table for selecting current transformers (CT) based on motor rated power and current, with guidelines for external protection CT selection in typical 380V motor systems.

Zero-sequence Current Transformer (ZCT)
Specifications for ZCTs are provided, detailing current ranges and dimensions for various applications.

Catalog excerpts

PR SERIES DIGITAL MOTOR PROTECTION RELAY i Introduction i Main Features Data recording and analysis. Variety of protection functions. Fault alarm, automatic power off function. RS485 remote communication and control. Real time motor operating status monitoring. Flexible configuration, can customized for specific needs. Digital motor protection relays, integral to motor systems, ensure motor reliability and safety by detecting internal faults (overcurrent, single-phase operation, grounding, bearing issues, and abnormal winding temperatures) and monitoring external conditions to prevent grid fluctuations and voltage surges from impacting the motor. These relays safeguard motor system stability and power grid reliability by monitoring and controlling internal and external issues and isolating interference sources. It can effectively prevent motor damage and the spread of interference back into the power grid. Application Automated industry. High voltage switchgear. Solar and wind energy systems. Power plant, power grid dispatching. Transmission towers and substations. •With this function oOptional function -Without this function Technology of Electrical Automatic

Open the catalog to page 1

PR200 SERIES ECONOMIC MOTOR PROTECTION RELAY i Introduction PR200 motor protection relay comes in a small and economical appearance and designed to real time monitor three-phase power lines for abnormal conditions. can be used with motors below 690V/ 820A. optional RS485 communication port can upload monitoring data and alarm status to the remote control system. PR200 provides various protection tripping to avoid motor failure. When PR200 senses that motor operating parameters reach preset alarm value, it will trigger DO port to warn of abnormal conditions; when abnormal parameters continue to...

Open the catalog to page 2

i Introduction PR240 motor protection relay can use with motors less than 690V/ 820A. It can realize a variety of control operation, such as measurement, self-diagnosis, maintenance management, field bus communication and other functions. PR240 can real-time monitoring the scene signal, provide various protection trip to avoid motor failure. optional RS485 port can upload monitor data and alarm status to remote control system. • Provide various start methods. • User free to configure each protection function. • Build in sequence of event function, max 100 trip records. • With programmable analog...

Open the catalog to page 3

Main Features PR260 series motor protection relay is suitable for protecting and monitoring the low-voltage motors with rated voltage less than 690V and rated current up to 820A. It equipped with 7-channels switch monitoring, can be configured as needed. It supports Modbus-RTU communication bus and can transmit monitoring data and alarm status to the remote control system. PR260 can real time monitor status of motor and detect various faults, such as abnormal start, overload, overcurrent, overheating, blocked rotor, phase loss, unbalance, under voltage, overvoltage, under power, underload, grounding...

Open the catalog to page 4

Technology of Electrical Automatic

Open the catalog to page 5

an Q i CT selection table Motor rated power (Kw) 1. External protection CT selection guide, typical in 380V motor system 2. If motor rated current more than 200A, need use 5A external CT i External current transformer (ECT) Motor rated power (Kw) Measurement 100A-200A Secondary to protector 100mA Maximum cable size 30mm Technology of Electrical Automatic

Open the catalog to page 6