Product/Technical Services

High Impedance Differential Protection IED GRH200

Product Overview

GRH200 is high impedance differential protection IED designed to provide very reliable, high speed and secure protection for various types of busbar system at all voltage levels. GRH200 provides phase-segregated high impedance differential protection for various busbar system such as single, double, or one and a half busbar configuration. GRH200 also provides T-zone protection of one and a half busbar, short line cable protection, and single phase restricted earth-fault protection. GRH200 is also equipped with basic control function for controlling various switching equipment. Device monitoring and recording functions are also provided within the flexible and user-friendly GR-200 Series platform.


Typical protection application examples are shown on the following figure.

  1. High Impedance Busbar Protection

    High Impedance Busbar Protection
  2. Transformer Restricted Earth Fault Protection

    Transformer Restricted Earth Fault Protection

Technical Description

Protection Functions

  1. Two stages of phase-segregated overcurrent elements for high impedance differential protection of busbar system

  2. Two stages of single-phase overcurrent element for restricted earth fault protection

  3. Trip circuit supervision

Control Functions

  1. Switchgear Control

  2. IED Mode Control

  3. Interlock Check

  4. Programmable Automatic Sequence Control

  5. Programmable Logic Control (PLC)

General Functions

  1. Eight settings groups to cover various operating conditions

  2. Automatic self-supervision

  3. Time synchronization by external clock via SNTP or using IRIG-B

  4. Password protection for settings and selection of local/remote control

  5. Simulation and test function to check protection/control function

  6. Internal circuit checks using forcible signal

Metering and recording functions

  1. Metering

    1. Power system current, voltage, and frequency

  2. Recording

    1. Event Record

    2. Fault Record

    3. Disturbance Record

Hardware Flexibility

  1. Various models and hardware options for flexible application depending on system requirement and controlled object

  2. Multi range DC power supply: 24 to 60V /110 to 250V

  3. Configurable binary inputs and outputs

Communication Interface

  1. Various option of system interface - RS485, fibre optic 100BASE-FX, 1000BASE-LX, 100BASE-TX/1000BASE-TX

  2. Support for multiple communication protocol - IEC 61850 (Ed 1.0 and 2.0), IEC 60870-5-103, IEC 62439 PRP/HSR/RSTP

Cyber Security​

Extensive cyber security features:

  1. Port and protocol control​

  2. Complexed password for extra security user authentication​

  3. Security event logging​

  4. Encrypted communication between GR-TIEMS and IED (Optional)​

  5. Role-based Access Control (RBAC) based on IEC 62351-8 (Optional)​​

Human Interface

  1. Selection of HMI: Standard LCD / large LCD

  2. 24 configurable tristate LEDs selectable red/green/yellow

  3. 7 programmable function keys for user demand operation

  4. Personal computer interface (USB and Ethernet ports)

  5. Monitoring jacks for internal circuit test