Toshiba GRD110, GRD110-110, GRD110-400, GRD110-420, GRD110-500 User Manual

GRD110

2

FEATURES

 Overcurrent protection for phase and earth

faults with IDMTL or DTL.

 Three instantaneous elements with DTL.
 Programmable reset characteristics.
 Sensitive earth fault protection (SEF).
 Restricted earth fault protection
 Undercurrent protection with DTL.
 Thermal overload protection.
 Negative phase sequence overcurrent

protection (NPS).

 Broken conductor detection.
 Circuit breaker fail protection.
 Inrush current detector for blocking differential

and/or overcurrent trip at energisation.

 Cold load pick-up feature.
 Five shot, three phase auto-reclose (six trips to

lockout).

 Sequence co-ordination with in-series auto-

reclosing devices.

 Four settings groups.
 Configurable binary inputs and outputs.
 Circuit breaker condition monitoring.
 Trip circuit supervision.
 Automatic self-supervision.
 Menu-based HMI system.
 Configurable LED indication.
 Metering and recording functions.
 Communication for remote setting and data

download is provided via the RSM (Relay
Setting and Monitoring) system.

 Front mounted RS232 serial port for local PC

communications.

 Rear mounted RS485 or fibre optic serial port

for remote PC communications.

 The IEC60870-5-103 protocol is provided for

communication with substation control and
automation systems.

APPLICATION

The GRD110 is a range of fully numeric multi-function
protection relays. GRD110 has five models which
differ according to the number and type of current
inputs fitted, see

Table 1.

Table 1 - GRD110 Models

Model Configuration

GRD110-110 Earth Fault and Sensitive Earth Fault

GRD110-400 Three Phase Fault and Earth Fault

GRD110-420

Three Phase Fault, Earth Fault and
Sensitive Earth Fault

GRD110-500

Three Phase Fault and Earth Fault
and Auto-reclose

GRD110-520

Three Phase Fault, Earth Fault,
Sensitive Earth Fault, and Auto-reclose

All models include multiple, high accuracy, overcurrent
protection elements (for phase and/or earth fault) with
inverse time and definite time delay functions. Other
protection functions are available according to model
type, including phase undercurrent protection with
definite time delay, thermal protection to IEC60255-8,
negative sequence overcurrent protection and a broken
conductor detection feature, see

Table 2.

All models provide continuous monitoring of internal
circuits and of software. External circuits are also
monitored, by trip circuit supervision and CB condition
monitoring features.

A user-friendly HMI is provided through a backlit LCD,
programmable LEDs, keypad and menu-based operating
system. PC access is also provided, either for local
connection via a front-mounted RS232 port, or for remote
connection via a rear-mounted RS485 or fibre optic
port. The communication system allows the user to
read and modify the relay settings, and to access data
gathered by the relay’s metering and recording functions.

Data available either via the relay HMI or
communications ports includes the following functions.

 Metering
 Fault recording
 Event recording
 Disturbance recording (available via

communications ports)

GRD110

3

Table 2 - GRD110 Features

GRD110 -

Model Number

110 400 420 500 520

Phase Fault O/C (50/51P) 9 9 9 9

Earth Fault O/C (50/51N) 9 9 9 9 9

SEF (50/51N) 9 9 9

Phase Undercurrent (37P) 9 9 9 9

Thermal Overload (49) 9 9 9 9

NPS Overcurrent (46) 9 9 9 9

Broken Conductor 9 9 9 9

Circuit Breaker Fail (50BF) 9 9 9 9

Inrush current detector 9 9

Cold Load Protection 9 9 9 9

Auto-reclose (79) 9 9

Trip circuit supervision 9 9 9 9 9

Self supervision 9 9 9 9 9

CB State Monitoring 9 9 9 9 9

Trip Counter Alarm 9 9 9 9 9
¦Iy Alarm 9 9 9 9

CB Operate Time Alarm 9 9 9 9 9

Four settings groups 9 9 9 9 9

Metering 9 9 9 9 9

Fault records 9 9 9 9 9

Event records 9 9 9 9 9

Disturbance records 9 9 9 9 9

IEC60870-5-103
Communication

9 9 9 9 9

GRD110

4

PROTECTION FUNCTIONS

Phase Fault Overcurrent Protection

Models GRD110-400, 420, 500 and -520 can provide
two or three phase overcurrent protection. Each provides
four independent overcurrent thresholds. The first
and second thresholds may be set for inverse time or
definite time operation. If inverse time is selected,
then any one of nine curves may be chosen,
including IEC and IEEE/ ANSI standard
characteristics. Further, user configurable curve is
available, if required. See Figure 1.

The first and second thresholds have a
programmable reset feature, selectable for
instantaneous, definite time or dependent time reset.
This feature can be used to protect against flashing
fault conditions, or to grade correctly with
electromechanical overcurrent relays.

The other overcurrent thresholds may be set for
definite time, or instantaneous operation. These
elements are immune to the effects of transformer
magnetising inrush and dc offset transient over-reach.

All elements can be inhibited by binary input signals
for operation in blocked overcurrent schemes and
busbar zone blocking protection.

Earth Fault Protection

The standard earth fault protection is available in all
models, and provides four independent overcurrent
thresholds. Protection functionality is the same as for
the phase fault elements, only with more sensitive
current thresholds.

For models GRD110-110, 400 and -500 the earth
fault quantity is measured directly, either by
connecting the input in the residual circuit of the㩷 phase
CTs, or, as is recommended for more sensitive
settings, using a dedicated core balance earth fault
CT. For model GRD110-420 and -520, the standard
earth fault quantity is derived internally from the
residual sum of the three phases.

Sensitive Earth Fault Protection (SEF)

GRD110-110, 420 and -520 provide earth fault
protection with more sensitive settings for use in
applications where the fault current magnitude may
be very low. A 2-stage overcurrent function is
provided, with the first stage programmable for
inverse time or definite time operation. The second
stage provides definite time operation and runs after
operation of the first stage. Three additional
overcurrent thresholds are provided, each with a
definite time delay.

The sensitive earth fault element includes a digital
filter which rejects all harmonics other than the
fundamental power system frequency.

The sensitive earth fault quantity is measured directly,

using a dedicated core balance earth fault CT.

This input can also be used in transformer restricted
earth fault applications, by the use of external metrosils
and setting resistors.

Phase Undercurrent Protection

Protection against loss of load is provided by the phase
undercurrent protection. Two independent thresholds
are provided, each with a programmable definite time
delay.

Thermal Overload Protection

The thermal overload feature provides protection for
cables and other plant against the effects of prolonged
operation under excess load conditions. A thermal replica
algorithm is applied to create a model for the thermal
characteristics of the protected plant. Tripping times
depend not only on the level of overload current, but
also on the level of prior load current, the thermal
replica providing ‘memory’ of previous conditions.

The thermal characteristics of the system are defined
by entering settings for full load current and thermal
time constant. The GRD110 issues a trip according to
the ‘cold’ and ‘hot’ curves specified in IEC60255-8
(see

Figure 2), to prevent the protected system from
exceeding its thermal capacity. The cold curve tripping
times are applicable when the system is first energised,
while the hot curves are relevant when the system
has already been carrying some prior load for a
period of time. An alarm output is also available to
give early warning of high load current, set as a
percentage of thermal capacity.

Negative Phase Sequence Overcurrent
Protection (NPS)

NPS protection can be used in applications where
certain fault conditions may not be detected by the
normal phase and earth overcurrent protections, for
example, in the case of a relay applied on the delta
side of a delta-star transformer, to detect an earth
fault on the star side. Alternatively, NPS can be used
to protect a three phase motor against the severe
overheating which results from operating with an
unbalanced supply.

Two independent thresholds are provided, each with
a programmable definite time delay.

Broken Conductor Protection

The unbalance condition caused by an open circuited
conductor is detected by the broken conductor protection.
An unbalance threshold with programmable definite
time delay is provided.

Circuit Breaker Fail Protection (CBF)

Two stage CBF protection provides outputs for re­tripping of the local circuit breaker and/or back­tripping to upstream circuit breakers. The CBF

GRD110

5

functions can also be initiated by external protections
via a binary input if required.

Inrush Current Detector

GRD110-500 and -520 provides an inrush current
detector against magnetizing inrush currents during
transformer energisation. The inrush current detector
detects the ratio between second harmonic current
and fundamental current.

Cold Load Protection

The cold load function modifies the overcurrent protection
settings for a period after energising the system. This
feature is used to prevent unwanted protection operation
when closing on to the type of load which takes a
high level of current for a period after energisation.
This is achieved by a ‘Cold Load Settings Group’ in
which the user can programme alternative settings.
Normally the user will choose higher current settings
and/or longer time delays and/or disable elements
altogether within this group.

Auto-Reclose

GRD110-500 and -520 provides an auto-reclose
function. Four independent sequences are provided,
one for each of the following:

Phase fault

Earth fault

Sensitive earth fault

External trip (initiated by a binary input)

Each sequence is independently programmable for
single shot, two shot, three shot, four shot or five shot
(i.e. six trips to lock-out) auto-reclose. Each
protection trip is programmable for instantaneous or
delayed operation, and each ARC shot has a
programmable dead time. Sequence co-ordination is
maintained between the auto-reclose sequences of
in-series relays on a feeder.

GRD110

6

Figure 1 - Operate and Reset Characteristics

Inverse Time Operate and Reset Curves

IEC/UK Inverse Curves

(Time Muliplier TMS = 1)

0.1

1

10

100

1000

1 10 100

Current (Multiple of Setting)

Operating Time (s)

LTI

NI

VI

EI

IEEE/US Inverse Curves

(Time Multiplier TMS = 1)

0.1

1

10

100

1 10 100

Current (Multiple of Setting)

Operating Time (s)

MI

VI

STI

I

EI

IEEE/US Reset Curves

(Time Multiplier T MS = 1)

1.00

10.00

100.00

1000.00

0.1 1

Current (Multiple of S etting)

Time (s)

MI

VI

EI

STI

I

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   Inverse time operate function   Dependent time reset function

Constants for dependent time curves

Curve Description k

D

C k

r

E

IEC Normal Inverse (NI) 0.14 0.02 0 - ­IEC Very Inverse (VI) 13.5 1 0 - ­IEC Extremely Inverse (EI) 80 2 0 - ­UK Long Time Inverse (LTI) 120 1 0 - ­IEEE Moderately Inverse (MI) 0.0515 0.02 0.114 4.85 2
IEEE Very Inverse (VI) 19.61 2 0.491 21.6 2
IEEE Extremely Inverse (EI) 28.2 2 0.1217 29.1 2
US CO8 Inverse (I) 5.95 2 0.18 5.95 2
US CO2 Short Time Inverse (STI) 0.02394 0.02 0.01694 2.261 2
User configurable setting 0.00 –

30.000

0.00 –

5.00

0.000 –

5.000

0.000 –

30.000

0.00 –

5.00

GRD110

7

Figure 2 - IEC60255-8 Thermal Characteristics

IEC60255-8 Thermal Characteristics

Thermal Curves (Cold Curve -

no prior load)

0.01

0.1

1

10

100

1000

1 10

Overload Current (Multiple of k.I

FLC

)

Operate Time (minutes)

W=1

W=2

W=5

W=10

W=20

W=50

W=100

Thermal Curves (Hot Curve -

90% prior load)

0.001

0.01

0.1

1

10

100

1000

1 10

Overload Current (Multiple of k.I

FLC

)

Operate Time (minutes)

W=100

W=50

W=20

W=10

W=5

W=2

W=1

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P

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IEC60255-8 ‘Cold’ Curve IEC60255-8 ‘Hot’ Curve

t = time to trip for constant overload current I (seconds)

I = overload current (largest phase current) (pu)

I

P

= previous load current (pu)

k.I

FLC

(or IT) = thermal overload current setting (pu)

W = thermal time constant (seconds)

Ln = natural logarithm

GRD110

8

MONITORING FUNCTIONS

Trip Circuit Supervision

The circuit breaker tripping control circuit can be
monitored by a binary input. Figure 3 shows a typical
scheme. When the trip circuit is complete, a small
current flows through the binary input, the circuit breaker
auxiliary contacts and the trip coil. This current flows
for both the breaker open and closed conditions.

Figure 3 - Illustration of Trip Circuit Supervision

Scheme

If the trip supply is lost or if a connection becomes
open circuit then the binary input resets and a Trip
Circuit Fail alarm is given in the form of an output
contact operation and LCD or LED indication.

Automatic Self-Supervision

Automatic monitoring of internal circuits and software
is provided. In the event of a failure being detected,
the ALARM LED on the relay fascia is illuminated, the
‘RELAY FAILURE’ binary output operates, and the
date and time of the failure is recorded in the event
record.

Circuit Breaker State Monitoring

If two binary inputs are programmed to the functions
‘CB OPEN’ and ‘CB CLOSED’ then the CB State
Monitoring function becomes active. In normal
circumstances these inputs are in opposite states. If
both show the same state then a ‘CB Defective’ alarm
is raised.

Circuit Breaker Condition Monitoring

The following CB condition monitoring functions are
provided:

 The trip counter increments the number of tripping

operations performed. An alarm is issued when
the count exceeds a user-defined setting.

 The ¦ I

y

counter increments the value of
current to the power ‘y’, recorded at the time of
issuing the tripping signal, on a phase by
phase basis. An alarm is issued when the count
for any phase exceeds a user-defined setting.
This feature is not available in GRD110-110.

 The operating time monitor records the time

between issuing the tripping signal and the phase
currents falling to zero. An alarm is issued when

the operate time for any phase exceeds a user­defined setting.

The CB condition monitoring functions are triggered
each time a trip is issued, and they can also be triggered
by an external device via a binary input.

METERING AND RECORDING

Metering

The following data is continuously available on the
relay fascia LCD and at a local or remote PC.

 Primary and secondary currents for each input.
 Positive and negative phase sequence

currents (only available in 3 phase models).

 Ratio of negative phase sequence to positive

phase sequence currents.

 Power frequency.
 Peak phase current demand.
 Thermal condition of system.
 Relay element output status.
 Binary input and output status.

Event Record

Records are stored for the 480 most recent events,
time-tagged to 1ms resolution. The event record is
available on the relay fascia LCD and at a local or
remote PC. Events are recorded as follows:

 Tripping operations.
 Alarms.
 Operation of protection elements.
 Change of state of binary inputs / outputs.
 Change of relay setting.
 Failure detected by automatic supervision.

Fault Record

A relay trip initiates fault recording. Records are stored
for the 8 most recent faults, time-tagged to 1ms
resolution. The fault record is available on the relay
fascia LCD and at a local or remote PC. Fault records
include the following data:

 Date and time of trip operation.
 Operating phase.
 Protection scheme responsible for trip.
 Measured current data.

Disturbance Record

The relay can record 8 analog and 32 binary signals,
initiated by relay tripping. The post-trigger recording
time can be set, and the maximum number of records
which can be stored is dependent on the recording
time chosen.

GRD110

Cir cuit Breaker

Binar y

Input

CB Au x.
Cont act s

CB Tri p Coi l Tr ip Out put +ve Trip

Suppl y

- ve Tr i p
Sup pl y

GRD110

9

Date and Time

GRD110 provides a date and time feature for tagging
of records.

USER INTERFACE

Relay Front Panel

A user friendly interface is provided on the relay front
panel. A menu-based system provides for easy
programming of relay functions and access to real­time and stored data. The front panel includes the
following features.

 16 character, 2-line LCD with backlight.
 6 LEDs.
 Keypad.
 RS232C serial port for connection of local PC.

Local PC Connection

The user can communicate with the GRD110 from a
local PC via the RS232C port on the front panel. Using
RSM100 software, the user can view and modify
settings, monitor real-time metering and analyse
recorded data.

Relay Setting and Monitoring (RSM)

GRD110 can be connected to the RSM system via the
rear mounted serial communications port, using either
RS485 or fibre optic connections (specified at time of
order). Using RSM100 software, the user can view and
modify settings, monitor real-time metering and analyse
recorded data.

A maximum of 32 x 8 relays can be connected to the
remote PC in multi-drop mode, by connection via a
protocol converter G1PR2, with a maximum data
transmission rate of 64kbps. The G1PR2 can be
provided with maximum 8 ports and each port
supports maximum 32 relays addressing.

Figure 4 and 5 show the configuration of the RSM
system and typical displays from the RSM100
software.

G1PR2

Protocol converter

Figure 4 - Relay Setting and Monitoring System

IEC60870-5-103 Communications

GRD110 supports the IEC60870-5-103
communication protocol. This protocol is used for
communication with a substation control and
monitoring system and is used to transfer measurand
data, status data and general commands between the
relay and the control system.

Relay Setting

The user can modify relay settings either using the
front panel keypad or using the RSM100 software
from a local or remote PC. Password protection is
available for added security.

Four settings groups are provided, allowing the user
to set one group for normal conditions, while the other
groups may be set to cover alternative operating
conditions.

Using the RSM software, the user can create a
settings file on a PC (without being connected to a
relay), and store the file ready for download to a relay
at a later date.

Binary Outputs

GRD110 provides eight binary output contacts for
tripping and alarm, of which seven are user
programmable. Each of the programmable binary
outputs is driven via a logic gate which can be
programmed for OR gate or AND gate operation.
Further, each output has a programmable reset
characteristic, settable for instantaneous drop-off,
delayed drop-off, or for latching operation. If latching
operation is selected then an operated relay must be
reset by the user, either by pressing the RESET
button, by energising a binary input which has been
programmed for ‘Remote Reset’ operation, or by a
communications command.

Binary Inputs

GRD110 provides eight programmable binary inputs.
Each binary input is individually user-programmable
for normal or inverted operation and for delayed pick­up and/or drop-off. Each input can also be used to
switch relay operation to a different settings group.

General purpose alarm functions are also included.
The user can define a text message for each alarm.
Then when inputs associated with that alarm are
raised, the defined text is displayed on the LCD.

GRD110

10

Figure 5 - Relay Setting and Monitoring System - PC Displays

PC DISPLAY



Setting Event record



Metering Data analysis

Fault record

GRD110

11

TECHNICAL DATA

Ratings

AC current In: 1A or 5A

Frequency: 50Hz or 60Hz

DC auxiliary supply: 110/125Vdc (Operative range: 88 - 150Vdc)

220/250Vdc (Operative range: 176 - 300Vdc)

48/54/60Vdc (Operative range: 38.4 - 72Vdc)

Superimposed AC ripple on DC supply: maximum 12%

DC supply interruption: maximum 50ms at 110V

Binary input circuit DC voltage: 110/125Vdc

220/250Vdc

48/54/60Vdc

Overload Ratings

AC current inputs:

3 times rated current continuous

100 times rated current for 1 second

Burden

AC phase current inputs: d 0.1VA (1A rating)

d 0.3VA (5A rating)

AC earth current inputs: d 0.1VA (1A rating)

d 0.3VA (5A rating)

AC sensitive earth inputs: d 0.1VA (1A rating)

d 0.2VA (5A rating)

DC power supply: d 10W (quiescent)

d 15W (maximum)

Binary input circuit: d 0.5W per input at 110Vdc

Current Transformer Requirements

Phase Inputs Typically 5P20 with rated burden according to load, (refer to

manual for detailed instructions).

Standard Earth Inputs: Core balance CT or residual connection of phase CTs.

Sensitive Earth Inputs: Core balance CT.

Phase Overcurrent Protection

P/F 1st, 2nd Overcurrent threshold: OFF, 0.04 – 5.00A in 0.01A steps (1A rating)

OFF, 0.2 – 25.0A in 0.1A steps (5A rating)

Delay type: DTL, IEC NI, IEC VI, IEC EI, UK LTI, IEEE MI,

IEEE VI, IEEE EI, US CO8 I, US CO2 STI, user configurable

IDMTL Time Multiplier Setting TMS: 0.010 - 1.500 in 0.001 steps

DTL delay: 0.00 - 300.00s in 0.01s steps

Reset Type: Definite Time or Dependent Time.

Reset Definite Delay: 0.0 - 300.0s in 0.1s steps

Reset Time Multiplier Setting RTMS: 0.010 - 1.500 in 0.001 steps

P/F 3rd, 4th Overcurrent thresholds: OFF, 0.10 - 50.00A in 0.01A steps (1A rating)

OFF, 0.5 -250.0A in 0.1A steps (5A rating)

DTL delay: 0.00 - 300.00s in 0.01s steps

GRD110

12

Earth Fault Protection

E/F 1st, 2nd Overcurrent threshold: OFF, 0.02 – 5.00A in 0.01A steps (1A rating)

OFF, 0.1 – 25.0A in 0.1A steps (5A rating)

Delay type: DTL, IEC NI, IEC VI, IEC EI, UK LTI, IEEE MI,

IEEE VI, IEEE EI, US CO8 I, US CO2 STI, user configurable

IDMTL Time Multiplier Setting TMS: 0.010 - 1.500 in 0.001 steps

DTL delay: 0.00 - 300.00s in 0.01s steps

Reset Type: Definite Time or Dependent Time

Reset Definite. Delay: 0.0 - 300.0s in 0.1s steps

Reset Time Multiplier Setting RTMS: 0.010 - 1.500 in 0.001 steps

E/F 3rd, 4th thresholds: OFF, 0.04 - 50.00A in 0.01A steps (1A rating)

OFF, 0.2 -250.0A in 0.1A steps (5A rating)

DTL delay: 0.00 - 300.00s in 0.01s steps

Sensitive Earth Fault Protection

SEF 1st, 2nd Overcurrent threshold: OFF, 0.002 - 0.200A in 0.001A steps (1A rating)

OFF, 0.01 - 1.00A in 0.01A steps (5A rating)

Delay Type: DTL, IEC NI, IEC VI, IEC EI, UK LTI, IEEE MI,

IEEE VI, IEEE EI, US CO8 I, US CO2 STI, user configurable

Stage 1 TMS: 0.010 - 1.500 in 0.001 steps

Stage 1 DTL delay: 0.00 - 300.00s in 0.01s steps

Stage 1 Reset Type: Definite Time or Dependent Time

Stage 1 Reset Def. Delay: 0.0 - 300.0s in 0.1s steps

Stage 1 RTMS: 0.010 - 1.500 in 0.001 steps

Stage 2 DTL delay(for SEF 1st) : 0.00 - 300.00s in 0.01s steps

SEF 3rd, 4th thresholds: OFF, 0.004 - 1.000A in 0.001A steps (1A rating)

OFF, 0.02 - 5.00A in 0.01A steps (5A rating)

DTL delay: 0.00 - 300.00s in 0.01s steps

Phase Undercurrent Protection

Undercurrent 1st, 2nd threshold: OFF, 0.10 - 2.00A in 0.01A steps (1A rating)

OFF, 0.5 - 10.0A in 0.1A steps (5A rating)

DTL Delay: 0.00 - 300.00s in 0.01s steps

Thermal Overload Protection

Iș = k.I

FLC

(Thermal setting): OFF, 0.40 - 2.00A in 0.01A steps (1A rating)

OFF, 2.0 - 10.0A in 0.1A steps (5A rating)

Time constant (IJ): 0.5 - 500.0mins in 0.1min steps

Thermal alarm: OFF, 50% to 99% in 1% steps

Negative Phase Sequence Protection

NPS 1st, 2nd threshold: OFF, 0.10 - 2.00A in 0.01A steps (1A rating)

OFF, 0.5 - 10.0A in 0.1A steps (5A rating)

DTL delay: 0.00 - 300.00s in 0.01s steps

Broken Conductor Protection

Broken conductor threshold (I2/I1): OFF, 0.10 - 1.00 in 0.01 steps

DTL delay: 0.00 - 300.00s in 0.01s steps

CBF Protection

CBF threshold: OFF, 0.10 - 2.00A in 0.01A steps (1A rating)

OFF, 0.5 - 10.0A in 0.1A steps (5A rating)

CBF stage 1 DTL: 0.00 - 300.00s in 0.01s steps

CBF stage 2 DTL: 0.00 - 300.00s in 0.01s steps

Inrush Current Detector

Second harmonic ratio setting (I

2f

/ I1f): 10 - 50% ' 1

Overcurrent thresholds: 0.10 - 2.00A in 0.01A steps (1A rating)

0.5 - 25.0A in 0.1A steps (5A rating)

GRD110

13

Autoreclose

ARC Reclaim Time 0.0 - 600.0s in 0.1s steps

Close Pulse Width 0.01 - 10.00s in 0.01s steps

Lock-out Recovery Time OFF, 0.1 - 600.0s in 0.1s steps

Sequences 1 - 5 Shots to Lock-out, each trip programmable for inst or

Delayed operation

Dead Times(programmable for each shot) 0.01 - 300.00s in 0.01s steps

Accuracy

Overcurrent Pick-ups: 100% of setting r 5%
Overcurrent PU/DO ratio: t100%, CBF element: t125%
Overcurrent PU/DO ratio: t95%
Undercurrent Pick-up: 100% of setting r 5%
Undercurrent PU/DO ratio: d100%
Inverse Time Delays: r 5% or 30ms (1.5 d I/Is d 30)
Definite Time Delays: r 1% or 10ms
Transient Overreach for instantaneous elements: <5% for X/R = 100.

Front Communication port - local PC (RS232)

Connection: Point to point

Cable type: Multi-core (straight)

Cable length: 15m (max.)

Connector: RS232C 9-way D-subminiature connector female

Rear Communication port - remote PC (RS485)

Connection: Multidrop (max. 32 relays)

Cable type: Twisted pair cable with shield

Cable length: 1200m (max.)

Connector: Screw terminals

Isolation: 2kVac for 1 min.

Transmission rate: 64kpbs for RSM system

9.6, 19.2kbps for IEC60870-5-103

Rear Communication port - remote PC (Fibre Optic for IEC60870-5-103: option)

Cable type: Graded-index multi-mode 62.5/125Pm type optical fibres

Cable length: 1000m (max.)

Connector: ST

Transmission rate: 9.6, 19.2kbps for IEC60870-5-103

Binary Inputs

Operating Voltage Typical 74Vdc(min. 70Vdc) for 110Vdc/125Vdc rating

Typical 138Vdc(min. 125Vdc) for 220Vdc/250Vdc rating

Typical 31Vdc(min. 28Vdc) for 48V/54V/60Vdc rating

Binary Outputs

Number 8

Ratings: Make and carry: 4A continuously

Make and carry: 10A, 220Vdc for 0.5s (L/Rt5ms)

Break: 0.1A, 220Vdc (L/R=40ms)

Durability: Make and carry: 10000 operations

Break: 100000 operations

Mechanical design

Weight 4.5kg

Case color 2.5Y7.5/1(approximation to Munsell value)

Installation Flush mounting

GRD110

14

ENVIRONMENTAL PERFORMANCE

Test Standards Details

Atmospheric Environment

Temperature IEC60068-2-1/2

Operating range: -10qC to +55qC.
Storage / Transit: -25qC to +70qC.

Humidity IEC60068-2-78

56 days at 40qC and 93% relative humidity.

Enclosure Protection IEC60529 IP51 (Rear: IP20)

Mechanical Environment

Vibration IEC60255-21-1

Response - Class 1
Endurance - Class 1

Shock and Bump IEC60255-21-2

Shock Response Class 1
Shock Withstand Class 1
Bump Class 1

Seismic IEC60255-21-3 Class 1

Electrical Environment

Dielectric Withstand IEC60255-5

2kVrms for 1 minute between all terminals and earth.
2kVrms for 1 minute between independent circuits.
1kVrms for 1 minute across normally open contacts.

High Voltage Impulse IEC60255-5

Three positive and three negative impulses of 5kV(peak),

1.2/50Ps, 0.5J between all terminals and between all terminals
and earth.

Electromagnetic Environment

High Frequency
Disturbance / Damped
Oscillatory Wave

IEC60255-22-1 Class 3,
IEC61000-4-12 / EN61000­4-12

1MHz 2.5kV applied to all ports in common mode.
1MHz 1.0kV applied to all ports in differential mode.

Electrostatic
Discharge

IEC60255-22-2 Class 3,
IEC61000-4-2 / EN61000­4-2

6kV contact discharge, 8kV air discharge.

Radiated RF
Electromagnetic
Disturbance

IEC60255-22-3 Class 3,
IEC61000-4-3 / EN61000­4-3

Field strength 10V/m for frequency sweeps of 80MHz to 1GHz
and 1.4GHz to 2.7GHz. Additional spot tests at 80, 160, 450,
900, 1850 and 2150MHz.

Fast Transient
Disturbance

IEC60255-22-4, IEC61000­4-4 / EN61000-4-4

4kV, 2.5kHz, 5/50ns applied to all inputs.

Surge Immunity

IEC60255-22-5,
IEC61000-4-5 /
EN61000-4-5

1.2/50Ps surge in common/differential modes:
HV ports: 2kV/1kV
PSU and I/O ports: 2kV/1kV
RS485 port: 1kV/0.5kV

Conducted RF
Electromagnetic
Disturbance

IEC60255-22-6 Class 3,
IEC61000-4-6 /
EN61000-4-6

10Vrms applied over frequency range 150kHz to 100MHz.
Additional spot tests at 27 and 68MHz.

Power Frequency
Disturbance

IEC60255-22-7 Class A,
IEC61000-4-16 /
EN61000-4-16

300V 50Hz for 10s applied to ports in common mode.
150V 50Hz for 10s applied to ports in differential mode.
Not applicable to AC inputs.

Conducted and
Radiated Emissions

IEC60255-25,
EN55022 Class A,
IEC61000-6-4

CISPR22 Class A

Conducted emissions:

0.15 to 0.50MHz: <79dB (peak) or <66dB (mean)

0.50 to 30MHz: <73dB (peak) or <60dB (mean)
Radiated emissions (at 10m):
30 to 230MHz: <40dB
230 to 1000MHz: <47dB

European Commission Directives

89/336/EEC

Compliance with the European Commission Electromagnetic
Compatibility Directive is demonstrated according to EN
61000-6-2 and EN 61000-6-4.

73/23/EEC

Compliance with the European Commission Low Voltage
Directive is demonstrated according to EN 50178 and EN
60255-5.

GRD110

15

ORDERING

Overcurrent Relay

Type:

Overcurrent Relay GRD110

Model:

-Model 110: Earth fault and sensitive earth fault 110

-Model 400: Three phase and earth fault 400

-Model 420: Three phase, earth and sensitive earth
fault

420

-Model 500: Three phase and earth fault with auto­reclose

500

-Model 520: Three phase, earth and sensitive earth
fault with auto-reclose

520

CT Rating:

1A 1

5A 2

Frequency:

50Hz 1

60Hz 2

DC auxiliary supply rating:

110V/125V 1

220V/250V 2

48V/54V/60V 3

Rear communication port:

RS485 1

Fibre optic 2

Dual RS485 3

GRD110

A

GRD110

16

TYPICAL APPLICATIONS / CONNECTIONS

Figure 6 - GRD110-110 Typical Application Diagram

OUTPUT CONTACTS

SIGNAL LIST (DEFAULT)

BO1

BO2

BO3

BO4

BO5

BO6

BO7

GENERAL TRIP

GENERAL TRIP

GENERAL TRIP

GENERAL TRIP

EF1 TRIP

EF1 TRIP

SEF1-S1 TRIP

DD FAIL.

(-

)

(+

)

+5Vdc

0V

DC
SUPPLY

DC-DC

RELAY FAIL.

1

TB2- A9

B9

CASE EARTH

E

A10

B10

FRAME EARTH

A

4

㪙㪦㪈

A

5

B5

A7

B7

㪙㪦㪉

A

6

B6

B8

A

8

㪙㪦㪊

A

9

B9

A

10

B10

㪙㪦㪋

A

11

B11

A13

B13

㪙㪦㪌

A

12

B12

B14

㪙㪦㪍

A

15

B15

A16

B16

㪙㪦㪎

B17

A

17

FAIL

A

18

B18

TB3-

B4

8

7

BUSBAR

6

CB

FRAME EARTH

I

E

I

SE

TB1-
5

CT

Core balance

CT

(P)

B1

BI1

B2

BI2

B3

BI3

A

2

A

3

B4

BI4

A

4

B5

BI5

A

5

B6

BI6

A

6

B7

BI7

A

7

B8

BI8

A

8

TB2-

A

1

(N)

BI1 COMMAND

BI2 COMMAND

BI3 COMMAND

BI4 COMMAND

BI5 COMMAND

BI6 COMMAND

BI7 COMMAND

BI8 COMMAND

TB4-A2

COM2-B

COM2-A

RS485 I/F for IEC60870-5-103
(Dual RS485 model only)

A1

A3

B3

COM2-0V

B1

B2

TB3-A2

COM1-B

COM1-A

RS485 I/F for RSM, IEC60870-5-103

A1

A3

B3

COM1-0V

B1

B2

GRD110

17

Figure 7 - GRD110-400, 500 Typical Application Diagram

OUTPUT CONTACTS

SIGNAL LIST (DEFAULT)

BO1

BO2

BO3

BO4

BO5

BO6

BO7

GENERAL TRIP

GENERAL TRIP

GENERAL TRIP

GENERAL TRIP

OC1 TRIP

OC1 TRIP

EF1 TRIP

DD FAIL.

(-

)

(+

)

+5Vdc

0V

DC
SUPPLY

DC-DC

RELAY FAIL.

1

TB2- A9

B9

CASE EARTH

E

A10

B10

FRAME EARTH

A

4

㪙㪦㪈

A

5

B5

A

7

B7

㪙㪦㪉

A

6

B6

B8

A

8

㪙㪦㪊

A

9

B9

A

10

B10

㪙㪦㪋

A

11

B11

A13

B13

㪙㪦㪌

A

12

B12

A14

B14

㪙㪦㪍

A

15

B15

A16

B16

㪙㪦㪎

B17

A

17

FAIL

A

18

B18

BUSBAR

4

3

2

6

5

CT

CB

FRAME EARTH

8

7

I

A

I

B

I

C

I

N

TB1­1

TB3-

B4

(P)

B1

BI1

B2

BI2

B3

BI3

A2A

3

B4

BI4

A

4

B5

BI5

A

5

B6

BI6

A

6

B7

BI7

A

7

B8

BI8

A

8

TB2-

A

1

(N)

BI1 COMMAND

BI2 COMMAND

BI3 COMMAND

BI4 COMMAND

BI5 COMMAND

BI6 COMMAND

BI7 COMMAND

BI8 COMMAND

TB4-A2

COM2-B

COM2-A

RS485 I/F for IEC60870-5-103
(Dual RS485 model only)

A1

A3

B3

COM2-0V

B1

B2

TB3-A2

COM1-B

COM1-A

RS485 I/F for RSM, IEC60870-5-103

A1

A3

B3

COM1-0V

B1

B2

GRD110

18

Figure 8 - GRD110-420, 520 Typical Application Diagram

OUTPUT CONTACTS

SIGNAL LIST (DEFAULT)

BO1

BO2

BO3

BO4

BO5

BO6

BO7

GENERAL TRIP

GENERAL TRIP

GENERAL TRIP

GENERAL TRIP

OC1 TRIP

EF1 TRIP

SEF1-S1 TRIP

DD FAIL.

(-)

(+)

+5Vdc

0V

DC
SUPPLY

DC-DC

RELAY FAIL.

1

TB2- A9

B9

CASE EARTH

E

A10

B10

FRAME EARTH

A

4

㪙㪦㪈

A

5

B5

A

7

B7

㪙㪦㪉

A

6

B6

B8

A

8

㪙㪦㪊

A

9

B9

A

10

B10

㪙㪦㪋

A

11

B11

A13

B13

㪙㪦㪌

A

12

B12

A14

B14

㪙㪦㪍

A

15

B15

A16

B16

㪙㪦㪎

B17

A

17

FAIL

A

18

B18

TB3-

B4

4

3

2

6

5

FRAME EARTH

8

7

I

A

I

B

I

C

I

SE

TB1­1

BUSBAR

CB

CT

Core balance
CT

(P)

B1

BI1

B2

BI2

B3

BI3

A

2

A

3

B4

BI4

A

4

B5

BI5

A

5

B6

BI6

A

6

B7

BI7

A

7

B8

BI8

A

8

TB2-

A

1

(N)

BI1 COMMAND

BI2 COMMAND

BI3 COMMAND

BI4 COMMAND

BI5 COMMAND

BI6 COMMAND

BI7 COMMAND

BI8 COMMAND

TB4-A2

COM2-B

COM2-A

RS485 I/F for IEC60870-5-103
(Dual RS485 model only)

A1

A3

B3

COM2-0V

B1

B2

TB3-A2

COM1-B

COM1-A

RS485 I/F for RSM, IEC60870-5-103

A1

A3

B3

COM1-0V

B1

B2

GRD110

19

RELAY OUTLINE

Figure 9 - GRD110 Outline Diagram

2 4 9

Panel cut-out

56

102

4 holes-I5.5

2 3 9

4 holes-I4.5

TB3

Rear view

E

TB1

TB2

TB4

TB1,TB2,TB3: Screw terminal

(M3.5 Ring)

TB4: Screw terminal

TB4 is provided only for dual

RS485 model.

Terminal block

TB3

A1 B1

A18 B18

1

2
3 4
5 6

TB1

TB2

A1

B1

A10

B10

7 8

A1 A3

TB4

B1

B3

104

2 5 8

IN SERVICE

TRIP
ALARM

VIEW

RESET

Front view

END

CEL

CAN

ENTER

185.2

32

15.6

Side view

6633-2 0803T1

Thedatagiveninthiscatalogaresubjecttochangewithoutnotice.

Power Systems Company

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