Description

Table of Contents

Overview of Shunt Reactor Differential Protection

Combined with shunt reactor differential protection, applicable to industrial, mining and power industries with voltage levels of 110kV and below. Built with high-performance 32-bit CPU, it integrates protection, measurement, control and communication functions, ideal for supporting substation comprehensive automation systems and electrical automation systems of new energy power plants.
The device can be installed centrally in panel cabinets or mounted directly on switch cabinets for distributed control.

Power Supply-Operating Voltage: AC/DC 86V~264V；Ripple Factor: ≤5%
Rated Current & Voltage-AC Current: 5A or 1A (specify upon order)；AC Voltage: 100V

Accurate Operating Range
Current: 0.04In～20In (In=5A or 1A)

Voltage: 1V～150V

Frequency: 45Hz～60Hz
Measurement Accuracy
Voltage & Current: Class 0.2 (including harmonics)

Active Power, Reactive Power & Power Factor: Class 0.5 (including harmonics)

Frequency: ≤±0.01Hz

4-20mA Output: Class 0.5 (specify upon order)
Setting Error
Current Element: ≤±2.5% setting value or ±0.01In

Voltage Element: ≤±2.5% setting value or ±0.005Un

Operating Time Error: Definite time protection ≤(±1% setting value+40)ms; frequency protection ≤(±1% setting value+60)ms
Under-frequency Protection
Setting Range: 45～50Hz, Accuracy: ≤±0.2Hz
Over-frequency Protection
Setting Range: 50～60Hz, Accuracy: ≤±0.2Hz
Under-voltage Slip Accuracy: ≤±0.5V/S
Under-frequency Slip Accuracy
1～3Hz/S: Error ≤±0.1Hz/S

3～10Hz/S: Error ≤±0.2Hz/S
Remote Signal Resolution: Less than 2ms
GPS Time Synchronization
IRIG-B: DC time code, RS485 port

NTP Synchronization: Ethernet port
Contact Capacity
Trip & Close current of operating circuit: 0.5A~5A adaptive, AC/DC trip circuit adaptive

Trip vacant contact: 5A (DC220V closing capacity)

Signal vacant contact: 5A (DC220V closing capacity)

English Name	ANSI Code
Differential Protection	87
Instantaneous Differential Protection	87
Three-stage Compound Voltage Overcurrent Protection	51V
Zero-sequence Overcurrent Protection	51N
Overload Protection	49
Measurement	—

It integrates ratio restrained differential protection and differential quick-break protection. The differential quick-break function responds to severe short-circuit faults instantly with ultra-fast action time (≤20ms). The ratio differential protection features adaptive variable characteristics, which is highly sensitive to minor internal faults and perfectly adapts to various reactor fault conditions.

Equipped with three-stage overcurrent protection, overload protection, zero-sequence overvoltage/overcurrent protection, overvoltage and undervoltage protection, and unbalance protection. It realizes full-coverage fault monitoring of reactors, matching the comprehensive protection requirements of industrial and power grid reactor equipment.

The device automatically detects abnormal states such as CT break, control circuit break, device RAM/ROM/AD module faults and power failure. It supports multi-group SOE event recording and fault waveform recording, which can retain data after power failure, providing accurate data support for subsequent fault analysis and equipment maintenance.

Supports multiple communication modes including RS485, CANBUS and Ethernet, and is compatible with IEC61850 and common power communication protocols. It can upload real-time measurement data, fault alarm signals, protection setting values and device operating status remotely, and supports remote online setting modification, protection switching and system time synchronization, realizing unattended intelligent monitoring.

The device features strong anti-interference performance and wide temperature adaptation, suitable for harsh industrial and substation environments. It supports two installation methods: switchgear local installation and centralized panel assembly, flexibly matching different project design requirements.

A：

Category	Reactor Differential Protection Device	Capacitor Protection Device
Protected Object	Protect winding inter-turn and inter-phase faults	Protect capacitor breakdown, inter-phase and earth faults
Protection Principle	Judge current difference via percentage differential	Adopt overcurrent, zero-sequence and voltage differential protection
Fault Characteristic	Internal winding damage, requiring rapid action	Prone to burst and mass damage, prevent cascading failure
Setting Logic	Set by excitation characteristics and CT parameters	Configure based on capacitance and grouping structure
Application Scenario	High voltage voltage stabilization and compensation	Reactive power compensation and harmonic suppression

There are no reviews yet.

Be the first to review “87R Differential Protection Relay | Shunt Reactor Differential Protection”