GW-LR51-A Protection and Control Device
Protection FunctionsCurrent Protection: 50P-1/2/3, 50P, 51P, 50N, 51N, 46, etc.Voltage Protection: 59PP, 27PP, LOP, etc.Control & Monitoring: CT/Control Circuit Disconnection, DI Trip, etc.Reclosing Control: 79 Auto-reclosing, SOTF AR, Standby Auto-injection Block, etc.Logging & Time Synchro
Industry Certifications & Standards
ISO 9001
Quality Management
Certified
EU Compliance
MID
Measuring Instruments
RoHS
Hazard-Free Materials
IEC 62053
Metering Accuracy
Listed
Safety Standard
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About the Power Meter
The digital power meter provides accurate measurement, reliable performance, and flexible functions for power monitoring and energy management.
| Parameter | Value |
|---|---|
| Power Supply | |
| Power Supply | 88-264V AC/DC, 48V/24V DC selectable, Power Consumption <4W |
| Voltage Input | |
| Rating | 100V, 380V (line voltage), 50Hz/60Hz |
| Measurement Range | 1V-570V (line voltage) |
| Power Consumption | <0.5VA per phase |
| Overload Capacity | 1.4 times rated voltage, continuous operation; 2 times rated voltage, allowed for 10 seconds |
| Current Input | |
| Rated Value (In) | Phase Current 5A (1A Customizable), Neutral Current interpolate 1A |
| Measurement Range | 0.04In to 20In |
| Power Consumption | <1VA per Phase |
| Overload Capacity | 2 times rated current, continuous operation; 10 times rated current, allowed for 10 seconds; 40 times rated current, allowed for 1 second |
| Measurement Accuracy | |
| Measurement Accuracy | Voltage/Current ±0.5%, Active Power ±1.0%, Frequency ±0.01Hz, Bidirectional Active Energy Class 1, Bidirectional Reactive Energy Class 2 |
| Digital Output | |
| Contact Capacity | 5A continuous, 30A, 0.2s |
| Breaking Capacity | DC resistive 50W, inductive 35W (L/R=0.04s); AC 1250VA, Maximum 5A |
| Digital Input | |
| Digital Input | Internal Excitation 24V DC |
| Environmental Conditions | |
| Operating Temperature | -25 ~ +70℃ |
| Storage Temperature | -40 ~ +85℃ |
| Atmospheric Pressure | 70 kPa~110 kPa |
| Above sea level | ≤ 3000m |
| Electrical Insulation | |
| Electrical Insulation | In accordance with IEC 60255-5 (GB/T 14598.3); 2kV@1minute |
| Insulation Resistance | In accordance with IEC 60255-5 (GB/T 14598.3); >100MΩ/500V AC |
| Electromagnetic Compatibility (EMC) | |
| Electrostatic Discharge (ESD) Immunity Test | Level 4 |
| Fast Transient Burst (FTB) Immunity Test | Level 4 |
| Surge (Transient Overvoltage) Immunity Test | Level 4 |
Product Overview
The GW-LR51-A Microcomputer Protection and Measurement Device is a new generation microprocessor-based relay protection equipment developed by our company to meet the requirements of power systems for relay protection.
It provides comprehensive protective functions for primary equipment such as lines, transformers, capacitors, and feeders at voltage levels of 35kV and below.
The device features high integration, comprehensive protection configurations, strong anti-interference capability, low power consumption, resistance to harsh environments, and convenient on-site maintenance and debugging.
It can be installed in switch cabinets in a distributed manner or mounted on panels. Both horizontal and vertical installation methods are supported to enhance panel space utilization.
Anatomy of Precision
Protection Functions
Current Protection: 50P-1/2/3, 50P, 51P, 50N, 51N, 46, etc.
Voltage Protection: 59PP, 27PP, LOP, etc.
Control & Monitoring: CT/Control Circuit Disconnection, DI Trip, etc.
Reclosing Control: 79 Auto-reclosing, SOTF AR, Standby Auto-injection Block, etc.
Logging & Time Synchronization Functions
Supports categorized query of 256 event records; data retained during power loss
Supports software time synchronization; internal clock error ≤ 1 s per 24 hours
Measurement Functions
Supports primary/secondary measurements
Supports forward/reverse active & reactive energy
Supports voltage, current, frequency, power, and power factor, etc.
Communication Functions
Standard 1× RS-485 communication interface (P1 port)
Supports Modbus-RTU industrial protocol
3 voltage inputs, 4 current inputs
11 DI, 5 DO
GR-LR51-A is widely applicable in construction and infrastructure, power distribution, industrial and manufacturing, and renewable energy sectors, supporting distributed generation integration, microgrid control, and power system protection and monitoring, enabling safe, efficient, and intelligent management of critical equipment and grid operations.
Cutout Dimensions and Installation Diagram (Unit: mm)
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