Toshiba GRD150, Manual

GRD150

4

FUNCTIONS

Protection 

- 4-stage non-directional and directional overcurrent 

and earth-fault protection and sensitive earth fault 
protection (option) 

  1

st

 and 2

nd

 stage: Instantaneous, IDMTL or DTL 

3

rd

 and 4

th

 stage: Instantaneous or DTL 

- 2-stage non-directional and directional negative 

phase sequence overcurrent protection 

  1

st

 stage: Instantaneous, IDMTL or DTL 

2

nd

 stage: Instantaneous or DTL 

- 2-stage overvoltage and undervoltage protection 
  1

st

 stage: Instantaneous, IDMTL or DTL 

2

nd

 stage: Instantaneous or DTL 

- 6-stage underfrequency or overfrequency protection 
- Thermal overload protection 
- Cold load protection function or Inrush current (2

nd

harmonic) detector provided for energising the 
system 

- Undercurrent protection 
- Broken conductor detection 
- Circuit breaker failure protection 
- Autoreclose function: 5-shots, 3-phase autoreclose 

(option) 

Control 

Two-stepped operation (select-control) is used for the 
control procedure of circuit breakers, disconnectors, 
earthing disconnector switches and transformers to 
ensure highly reliable operation. 

- Control of circuit breakers, disconnectors and 

earthing disconnector switches 

- Interlock check 
- Synchronism check for circuit breaker closing 

(option) 

- MIMIC configuration picture displayed on LCD 
- Double command blocking 
- Switchgear operation counter 
- Control blocking 

Password protection is provided to operate above 
functions. 
 
 
 
 
 
 
 
 
 
 

Monitoring and Metering 

- Status monitoring of switchgear devices and failure 

monitoring of power apparatus, control equipment, 
protection relays and ancillary equipment 

- Metering: current, voltage, frequency, active power, 

reactive power and max. demand values 

  An energy calculation (Watt-hour, var-hour) is also 

available. 

- Limit value checking of metering 
- Opening and closing time monitoring 

These data are available on the HMI and at a local or 
remote PC. 

Recording 

- Event records: The most recent 480 time-tagged 

events with 1ms resolution are stored. 

- Alarm records: The most recent 32 time-tagged 

alarms with 1ms resolution are stored. 

- Fault records: The most recent 8 time-tagged faults 

with 1ms resolution are stored.

- Disturbance records: GRD150 can record 9 analog 

and 32 binary signals, initiated by relay tripping. Pre-
trigger and post-trigger recording times can be set, 
and the maximum number of records which can be 
stored is dependent on the recording times chosen.  

These records are available on the HMI and at a local 
or remote PC.