GRD110

FEATURES APPLICATION
Overcurrent protection for phase and earth The GRD110 is a range of fully numeric multi-function
faults with IDMTL or DTL. protection relays. GRD110 has three models which
Three instantaneous elements with DTL. differ according to the number and type of current
Programmable reset characteristics. inputs fitted, see Table 1.
Sensitive earth fault protection (SEF). Table 1 - GRD110 Models
Restricted earth fault protection Model Configuration
Undercurrent protection with DTL.
GRD110-110 Earth Fault and Sensitive Earth Fault
Thermal overload protection.
GRD110-400 Three Phase Fault and Earth Fault
Negative phase sequence overcurrent
protection (NPS). GRD110-420 Three Phase Fault, Earth Fault and
Sensitive Earth Fault
Broken conductor detection.
Circuit breaker fail protection.
Cold load pick-up feature. All models include multiple, high accuracy, overcurrent
protection elements (for phase and/or earth fault) with
Four settings groups.
inverse time and definite time delay functions. Other
Configurable binary inputs and outputs. protection functions are available according to model
Circuit breaker condition monitoring. type, including phase undercurrent protection with
definite time delay, thermal protection to IEC60255-8,
Trip circuit supervision.
negative sequence overcurrent protection and a broken
Automatic self-supervision. conductor detection feature, see Table 2.
Menu-based HMI system.
All models provide continuous monitoring of internal
Configurable LED indication. circuits and of software. External circuits are also
Metering and recording functions. monitored, by trip circuit supervision and CB condition
Communication for remote setting and data monitoring features.
download is provided via the RSM (Relay
A user-friendly HMI is provided through a backlit LCD,
Setting and Monitoring) system.
programmable LEDs, keypad and menu-based operating
Front mounted RS232 serial port for local PC system. PC access is also provided, either for local
communications. connection via a front-mounted RS232 port, or for remote
Rear mounted RS485 or fibre optic serial port connection via a rear-mounted RS485 or fibre optic
for remote PC communications. port. The communication system allows the user to
read and modify the relay settings, and to access data
The IEC60870-5-103 protocol is provided for
gathered by the relay’s metering and recording functions.
communication with substation control and
automation systems. 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)

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GRD110
Table 2 - GRD110 Features operation in blocked overcurrent schemes and busbar
zone blocking protection.
GRD110 -
Model Number
110 400 420 Earth Fault Protection
Phase Fault O/C (50/51P) The standard earth fault protection is available in all
Earth Fault O/C (50/51N) models, and provides four independent overcurrent
thresholds. Protection functionality is the same as for
SEF (50/51N)
the phase fault elements, only with more sensitive
Phase Undercurrent (37P) current thresholds.
Thermal Overload (49)
For models GRD110-110 and -400, the earth fault
NPS Overcurrent (46) quantity is measured directly, either by connecting the
Broken Conductor input in the residual circuit of the phase CTs, or, as is
recommended for more sensitive settings, using a
Circuit Breaker Fail (50BF) dedicated core balance earth fault CT. For model
Cold Load Protection GRD110-420, the standard earth fault quantity is
derived internally from the residual sum of the three
Trip circuit supervision
phases.
Self supervision
CB State Monitoring Sensitive Earth Fault Protection (SEF)
Trip Counter Alarm GRD110-110 and -420 provide earth fault protection
∑I Alarm
y with more sensitive settings for use in applications
where the fault current magnitude may be very low. A
CB Operate Time Alarm 2-stage overcurrent function is provided, with the first
Four settings groups stage programmable for inverse time or definite time
operation. The second stage provides definite time
Metering
operation and runs after operation of the first stage.
Fault records Three additional overcurrent thresholds are provided,
Event records each with a definite time delay.

Disturbance records The sensitive earth fault element includes a digital

IEC60870-5-103 filter which rejects all harmonics other than the
fundamental power system frequency.
Communication
The sensitive earth fault quantity is measured directly,
using a dedicated core balance earth fault CT.
PROTECTION FUNCTIONS This input can also be used in transformer restricted
earth fault applications, by the use of external metrosils
Phase Fault Overcurrent Protection and setting resistors.
Models GRD110-400 and GRD110-420 can provide
two or three phase overcurrent protection. Each provides Phase Undercurrent Protection
four independent overcurrent thresholds. The first Protection against loss of load is provided by the phase
threshold may be set for inverse time or definite time undercurrent protection. Two independent thresholds
operation. If inverse time is selected, then any one of are provided, each with a programmable definite time
nine curves may be chosen, including IEC and IEEE/ delay.
ANSI standard characteristics, (see Figure 1).
Thermal Overload Protection
The first threshold has a programmable reset feature,
selectable for instantaneous, definite time or The thermal overload feature provides protection for
dependent time reset. This feature can be used to cables and other plant against the effects of prolonged
protect against flashing fault conditions, or to grade operation under excess load conditions. A thermal replica
correctly with electromechanical overcurrent relays. algorithm is applied to create a model for the thermal
characteristics of the protected plant. Tripping times
The other overcurrent thresholds may be set for depend not only on the level of overload current, but
definite time, or instantaneous operation. These also on the level of prior load current, the thermal
elements are immune to the effects of transformer replica providing ‘memory’ of previous conditions.
magnetising inrush and dc offset transient over-reach.
The thermal characteristics of the system are defined
All elements can be inhibited by binary input signals for by entering settings for full load current and thermal

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GRD110
time constant. The GRD110 issues a trip according to Broken Conductor Protection
the ‘cold’ and ‘hot’ curves specified in IEC60255-8
(see Figure 2), to prevent the protected system from The unbalance condition caused by an open circuited
exceeding its thermal capacity. The cold curve tripping conductor is detected by the broken conductor protection.
times are applicable when the system is first energised, An unbalance threshold with programmable definite
while the hot curves are relevant when the system time delay is provided.
has already been carrying some prior load for a
period of time. An alarm output is also available to Circuit Breaker Fail Protection (CBF)
give early warning of high load current, set as a Two stage CBF protection provides outputs for re-
percentage of thermal capacity. tripping of the local circuit breaker and/or back-
tripping to upstream circuit breakers. The CBF
Negative Phase Sequence Overcurrent functions can also be initiated by external protections
Protection (NPS) via a binary input if required.
NPS protection can be used in applications where
certain fault conditions may not be detected by the Cold Load Protection
normal phase and earth overcurrent protections, for The cold load function modifies the overcurrent protection
example, in the case of a relay applied on the delta settings for a period after energising the system. This
side of a delta-star transformer, to detect an earth feature is used to prevent unwanted protection operation
fault on the star side. Alternatively, NPS can be used when closing on to the type of load which takes a
to protect a three phase motor against the severe high level of current for a period after energisation.
overheating which results from operating with an This is achieved by a ‘Cold Load Settings Group’ in
unbalanced supply. which the user can programme alternative settings.
Normally the user will choose higher current settings
Two independent thresholds are provided, each with
and/or longer time delays and/or disable elements
a programmable definite time delay.
altogether within this group.

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GRD110

Inverse Time Operate and Reset Curves

IEC/UK Inverse Curves IEEE/US Inverse Curves IEEE/US Reset Curves

(Time Muliplier TMS = 1) (Time Multiplier TMS = 1) (Time Multiplier TMS = 1)
1000 100 1000.00

100

10 100.00

Operating Time (s)

Operating Time (s)

Time (s)
EI
10
LTI
VI

NI 1 10.00
MI
I
1 VI
VI
MI
STI

I
EI STI
EI
0.1 0.1
1.00
1 10 100 1 10 100
0.1 1
Current (Multiple of Setting) Current (Multiple of Setting) Current (Multiple of Setting)

⎧⎡ ⎤ ⎫ ⎡ ⎤
⎪ ⎥ + c⎪ ⎢ ⎥
t = TMS × ⎨⎢
k tr
⎥ ⎬ t = RTMS × ⎢ ⎥
⎪⎢
⎢ I α
⎩⎣ Is
( )
− 1⎥ ⎪
⎦ ⎭
⎢ ⎛I ⎞ ⎥
2

⎢⎣1 − ⎜⎝ I S ⎟⎠ ⎥⎦

Inverse time operate function Dependent time reset function

Constants for dependent time curves

Curve Description k α C tr
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
IEEE Very Inverse (VI) 19.61 2 0.491 21.6
IEEE Extremely Inverse (EI) 28.2 2 0.1217 29.1
US CO8 Inverse (I) 5.95 2 0.18 5.95
US CO2 Short Time Inverse (STI) 0.02394 0.02 0.01694 2.261

Figure 1 - Operate and Reset Characteristics

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GRD110

IEC60255-8 Thermal Characteristics

Thermal Curves (Cold Curve - Thermal Curves (Hot Curve -

no prior load) 90% prior load)

1000 1000

100
100

10
Operate Time (minutes)

Operate Time (minutes)

10

1
τ=100
τ=100
1 τ=50
τ=50
0.1
τ=20 τ=20

τ=10 τ=10
0.1 τ=5
τ=5
0.01
τ=2
τ=2
τ=1
τ=1
0.01 0.001
1 10 1 10
Overload Current (Multiple of k.IFLC) Overload Current (Multiple of k.IFLC)

⎡ I2 ⎤ ⎡ I 2 − I P2 ⎤
t = τ .Ln ⎢ 2 2⎥
; t = τ .Ln ⎢ 2 2⎥
⎣ I − (k .I FLC ) ⎦ ⎣ I − (k .I FLC ) ⎦

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)
IP = previous load current (pu)
k.IFLC (or Iθ) = thermal overload current setting (pu)
τ = thermal time constant (seconds)
Ln = natural logarithm

Figure 2 - IEC60255-8 Thermal Characteristics

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GRD110
MONITORING FUNCTIONS currents falling to zero. An alarm is issued when
the operate time for any phase exceeds a user-
Trip Circuit Supervision defined setting.

The circuit breaker tripping control circuit can be The CB condition monitoring functions are triggered
monitored by a binary input. Figure 3 shows a typical each time a trip is issued, and they can also be triggered
scheme. When the trip circuit is complete, a small by an external device via a binary input.
current flows through the binary input, the circuit breaker
auxiliary contacts and the trip coil. This current flows METERING AND RECORDING
for both the breaker open and closed conditions.
Metering
GRD110 Circuit Breaker
The following data is continuously available on the
+ve Trip Trip Output CB Trip Coil -ve Tri p
relay fascia LCD and at a local or remote PC.
Suppl y Suppl y
Primary and secondary currents for each input.
Positive and negative phase sequence
Binar y CB Aux. currents (only available in 3 phase models).
Input Contac ts

Ratio of negative phase sequence to positive

phase sequence currents.
Figure 3 - Illustration of Trip Circuit Supervision
Scheme Power frequency.
Peak phase current demand.
If the trip supply is lost or if a connection becomes
open circuit then the binary input resets and a Trip Thermal condition of system.
Circuit Fail alarm is given in the form of an output Relay element output status.
contact operation and LCD or LED indication. Binary input and output status.

Automatic Self-Supervision Event Record

Automatic monitoring of internal circuits and software Records are stored for the 480 most recent events,
is provided. In the event of a failure being detected, time-tagged to 1ms resolution. The event record is
the ALARM LED on the relay fascia is illuminated, the available on the relay fascia LCD and at a local or
‘RELAY FAILURE’ binary output operates, and the remote PC. Events are recorded as follows:
date and time of the failure is recorded in the event
record. Tripping operations.
Alarms.
Circuit Breaker State Monitoring Operation of protection elements.
If two binary inputs are programmed to the functions Change of state of binary inputs / outputs.
‘CB OPEN’ and ‘CB CLOSED’ then the CB State Change of relay setting.
Monitoring function becomes active. In normal
circumstances these inputs are in opposite states. If Failure detected by automatic supervision.
both show the same state then a ‘CB Defective’ alarm
is raised.
Fault Record
Circuit Breaker Condition Monitoring A relay trip initiates fault recording. Records are stored
for the 8 most recent faults, time-tagged to 1ms
The following CB condition monitoring functions are
resolution. The fault record is available on the relay
provided:
fascia LCD and at a local or remote PC. Fault records
The trip counter increments the number of tripping include the following data:
operations performed. An alarm is issued when
Date and time of trip operation.
the count exceeds a user-defined setting.
Operating phase.
The ∑ Iy counter increments the value of
current to the power ‘y’, recorded at the time of Protection scheme responsible for trip.
issuing the tripping signal, on a phase by Measured current data.
phase basis. An alarm is issued when the count
for any phase exceeds a user-defined setting. Disturbance Record
This feature is not available in GRD110-110.
The relay can record 8 analog and 32 binary signals,
The operating time monitor records the time initiated by relay tripping. The post-trigger recording
between issuing the tripping signal and the phase time can be set, and the maximum number of records

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GRD110
which can be stored is dependent on the recording
time chosen.

Date and Time Protocol converter

G1PR2

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 real-
time and stored data. The front panel includes the Figure 4 - Relay Setting and Monitoring System
following features.
16 character, 2-line LCD with backlight. IEC60870-5-103 Communications
6 LEDs. GRD110 supports the IEC60870-5-103
Keypad. communication protocol. This protocol is used for
communication with a substation control and
RS232C serial port for connection of local PC. monitoring system and is used to transfer measurand
Local PC Connection data, status data and general commands between the
relay and the control system.
The user can communicate with the GRD110 from a
local PC via the RS232C port on the front panel. Using Relay Setting
RSM100 software, the user can view and modify
The user can modify relay settings either using the
settings, monitor real-time metering and analyse
front panel keypad or using the RSM100 software
recorded data.
from a local or remote PC. Password protection is
Relay Setting and Monitoring (RSM) available for added security.

GRD110 can be connected to the RSM system via the Four settings groups are provided, allowing the user
rear mounted serial communications port, using either to set one group for normal conditions, while the other
RS485 or fibre optic connections (specified at time of groups may be set to cover alternative operating
order). Using RSM100 software, the user can view and conditions.
modify settings, monitor real-time metering and analyse
Using the RSM software, the user can create a
recorded data.
settings file on a PC (without being connected to a
A maximum of 32 x 8 relays can be connected to the relay), and store the file ready for download to a relay
remote PC in multi-drop mode, by connection via a at a later date.
protocol converter G1PR2, with a maximum data
transmission rate of 64kbps. The G1PR2 can be Binary Outputs
provided with maximum 8 ports and each port GRD110 provides eight binary output contacts for
supports maximum 32 relays addressing. tripping and alarm, of which seven are user
Figure 4 and 5 show the configuration of the RSM programmable. Each of the programmable binary
system and typical displays from the RSM100 outputs is driven via a logic gate which can be
software. 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.

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GRD110
Binary Inputs General purpose alarm functions are also included.
The user can define a text message for each alarm.
GRD110 provides eight programmable binary inputs. Then when inputs associated with that alarm are
Each binary input is individually user-programmable raised, the defined text is displayed on the LCD.
for normal or inverted operation and for delayed pick-
up and/or drop-off. Each input can also be used to
switch relay operation to a different settings group.

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GRD110

PC DISPLAY

Setting Event record

Metering Data analysis

Fault record

Figure 5 - Relay Setting and Monitoring System - PC Displays

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GRD110
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 (Operative range: 88 - 150Vdc)
220/250Vdc (Operative range: 176 - 300Vdc)
48/54/60Vdc (Operative range: 38.4 - 72Vdc)
Overload Ratings
AC current inputs: 3 times rated current continuous
100 times rated current for 1 second
Burden
AC phase current inputs: ≤ 0.1VA (1A rating)
≤ 0.3VA (5A rating)
AC earth current inputs: ≤ 0.1VA (1A rating)
≤ 0.3VA (5A rating)
AC sensitive earth inputs: ≤ 0.1VA (1A rating)
≤ 0.2VA (5A rating)
DC power supply: ≤ 10W (quiescent)
≤ 15W (maximum)
Binary input circuit: ≤ 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 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
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 2nd, 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

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GRD110
Earth Fault Protection
E/F 1st 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
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 2nd, 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 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
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: 0.00 - 300.00s in 0.01s steps
SEF 2nd, 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
Iθ = k.IFLC (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 (τ): 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

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GRD110
Accuracy
Overcurrent Pick-ups: 100% of setting ± 5%
Overcurrent PU/DO ratio: ≥100%, CBF element: ≥125%
Overcurrent PU/DO ratio: ≥95%
Undercurrent Pick-up: 100% of setting ± 5%
Undercurrent PU/DO ratio: ≤100%
Inverse Time Delays: ± 5% or 30ms (1.5 ≤ I/Is ≤ 30)
Definite Time Delays: ± 1% or 10ms
Transient Overreach for instantaneous <−5% for X/R = 100.
elements:
Front Communication port - local PC (RS232)
Connection: Point to point
Cable type: Multi-core (straight)
Cable length: 15m (max.)
Connector: RS232C 9-way D-type female
Rear Communication port - remote PC (RS485)
Connection: Multidrop (max. 32 relays)
Cable type: Twisted pair
Cable length: 1200m (max.)
Connector: Screw terminals
Isolation: 1kVac 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: 50/125 or 62.5/125µm fibre
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/R≥5ms)
Break: 0.1A, 220Vdc (L/R=40ms)
Durability: Make and carry: 10000 operations
Break: 100000 operations
Mechanical design
Weight 4.5kg
Case color Munsell No. 10YR8/0.5
Installation Flush mounting

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GRD110
ENVIRONMENTAL PERFORMANCE
Test Standards Details
Atmospheric Environment
Temperature IEC60068-2-1/2 Operating range: -10°C to +55°C.
Storage / Transit: -25°C to +70°C.
Humidity IEC60068-2-78 56 days at 40°C 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),
1.2/50µs, 0.5J between all terminals and between all terminals
and earth.
Electromagnetic Environment
High Frequency IEC60255-22-1 Class 3, 1MHz 2.5kV applied to all ports in common mode.
Disturbance / Damped IEC61000-4-12 / EN61000- 1MHz 1.0kV applied to all ports in differential mode.
Oscillatory Wave 4-12
Electrostatic IEC60255-22-2 Class 3, 6kV contact discharge, 8kV air discharge.
Discharge IEC61000-4-2 / EN61000-
4-2
Radiated RF IEC60255-22-3 Class 3, Field strength 10V/m for frequency sweeps of 80MHz to 1GHz
Electromagnetic IEC61000-4-3 / EN61000- and 1.7GHz to 2.2GHz. Additional spot tests at 80, 160, 450,
Disturbance 4-3 900 and 1890MHz.
Fast Transient IEC60255-22-4, IEC61000- 4kV, 2.5kHz, 5/50ns applied to all inputs.
Disturbance 4-4 / EN61000-4-4
Surge Immunity IEC60255-22-5, 1.2/50µs surge in common/differential modes:
IEC61000-4-5 / EN61000- HV ports: 2kV/1kV (peak)
4-5 PSU and I/O ports: 2kV/1kV (peak)
RS485 port: 1kV (peak)
Conducted RF IEC60255-22-6 Class 3, 10Vrms applied over frequency range 150kHz to 100MHz.
Electromagnetic IEC61000-4-6 / EN61000- Additional spot tests at 27 and 68MHz.
Disturbance 4-6
Power Frequency IEC60255-22-7, IEC61000- 300V 50Hz for 10s applied to ports in common mode.
Disturbance 4-16 / EN61000-4-16 150V 50Hz for 10s applied to ports in differential mode.
Not applicable to AC inputs.
Conducted and IEC60255-25, Conducted emissions:
Radiated Emissions EN55022 Class A, 0.15 to 0.50MHz: <79dB (peak) or <66dB (mean)
IEC61000-6-4 / EN61000- 0.50 to 30MHz: <73dB (peak) or <60dB (mean)
6-4 Radiated emissions (at 30m):
30 to 230MHz: <30dB
230 to 1000MHz: <37dB
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.

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GRD110

ORDERING

Overcurrent Relay
GRD110 ∗

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 420
fault
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
RS485 + Fibre optic 9

15
GRD110
TYPICAL APPLICATIONS / CONNECTIONS

BUSBAR

CT OUTPUT CONTACTS
TB3- SIGNAL LIST (DEFAULT)
B4
BO1 GENERAL TRIP
Core balance A4
CT TB1- BO2 GENERAL TRIP
A5
5 BO3 GENERAL TRIP
B5
6 IE BO4 GENERAL TRIP
A7
7 BO5 EF1 TRIP
CB 8 ISE B7
BO6 EF1 TRIP
A6
BO7 SEF1-S1 TRIP
FRAME EARTH B6
B8
A8
(P) A9
TB2-
B9
A1
BI1 COMMAND BI1 A10
B1
A2 B10
BI2 COMMAND BI2
B2 A11
A3 B11
BI3 COMMAND BI3
B3 A13
BI4 COMMAND A4 B13
BI4
B4 A12
A5 B12
BI5 COMMAND BI5
B5
A14
A6
BI6 COMMAND BI6 B14
B6
A7 A15
BI7 COMMAND BI7
B7 B15
A8 A16
BI8 COMMAND BI8
B8
B16

(N)
B17

FAIL A17
A18
B18

RELAY FAIL.
≥1
DD FAIL.
TB3-A2
TB2- A9 +5Vdc COM1-A
DC (+) B2
DC-DC
SUPPLY B9 A1
(-) 0V COM1-B
B1 RS485 I/F for RSM, IEC60870-5-103
A10 A3
COM1-0V
B10 B3
FRAME EARTH
E
CASE EARTH
TB4-A2
COM2-A
B2
A1
COM2-B
B1 RS485 I/F for IEC60870-5-103
(Dual RS485 model only)
A3
COM2-0V
B3

Figure 6 - GRD110-110 Typical Application Diagram

16
GRD110

BUSBAR

OUTPUT CONTACTS
TB1-
TB3- SIGNAL LIST (DEFAULT)
1
B4
2 IA BO1 GENERAL TRIP
3 A4
CT BO2 GENERAL TRIP
4 IB A5
5 BO3 GENERAL TRIP
B5
CB 6 IC BO4 GENERAL TRIP
A7
7 BO5 OC1 TRIP
8 IN B7
A6 BO6 OC1 TRIP
B6 BO7 EF1 TRIP
FRAME EARTH
B8
A8
(P) A9
TB2- B9
A1
BI1 COMMAND BI1 A10
B1
A2 B10
BI2 COMMAND BI2
B2 A11
A3 B11
BI3 COMMAND BI3
B3 A13
BI4 COMMAND A4 B13
BI4
B4 A12
A5 B12
BI5 COMMAND BI5
B5
A14
A6
BI6 COMMAND BI6 B14
B6
A7 A15
BI7 COMMAND BI7
B7 B15
A8 A16
BI8 COMMAND BI8
B8
B16

(N)
B17
A17
FAIL
A18
B18

RELAY FAIL.
≥1
DD FAIL.
TB2- A9 +5Vdc TB3-A2
DC COM1-A
(+) DC-DC B2
SUPPLY B9
(-) 0V
A1
COM1-B
B1 RS485 I/F for RSM, IEC60870-5-103
A10
A3
COM1-0V
B10
FRAME EARTH B3
E
CASE EARTH

TB4-A2
COM2-A
B2
A1
COM2-B
B1 RS485 I/F for IEC60870-5-103
(Dual RS485 model only)
A3
COM2-0V
B3

Figure 7 - GRD110-400 Typical Application Diagram

17
GRD110

BUSBAR

CT OUTPUT CONTACTS
TB1-
TB3- SIGNAL LIST (DEFAULT)
1
B4
2 IA BO1 GENERAL TRIP
Core balance 3 A4
CT BO2 GENERAL TRIP
4 IB A5
5 BO3 GENERAL TRIP
B5
6 IC BO4 GENERAL TRIP
A7
7 BO5 OC1 TRIP
CB 8 ISE B7
BO6 EF1 TRIP
A6
BO7 SEF1-S1 TRIP
FRAME EARTH B6
B8
A8
(P) A9
TB2-
B9
A1
BI1 COMMAND BI1 A10
B1
A2 B10
BI2 COMMAND BI2
B2 A11
A3 B11
BI3 COMMAND BI3
B3 A13
BI4 COMMAND A4 B13
BI4
B4 A12
A5 B12
BI5 COMMAND BI5
B5
A14
A6
BI6 COMMAND BI6 B14
B6
A7 A15
BI7 COMMAND BI7
B7 B15
A8 A16
BI8 COMMAND BI8
B8
B16

(N)
B17

FAIL A17
A18
B18

RELAY FAIL.
≥1
DD FAIL.
TB3-A2
TB2- A9 +5Vdc COM1-A
DC (+) B2
DC-DC
SUPPLY B9
0V A1
(-) COM1-B
B1 RS485 I/F for RSM, IEC60870-5-103
A10 A3
COM1-0V
B10 B3
FRAME EARTH
E
CASE EARTH
TB4-A2
COM2-A
B2
A1
COM2-B
B1 RS485 I/F for IEC60870-5-103
(Dual RS485 model only)
A3
COM2-0V
B3

Figure 8 - GRD110-420 Typical Application Diagram

18
GRD110
RELAY OUTLINE

IN SERVICE VIEW
TRIP
ALARM

25 8
RESET

CAN
CEL ENTER

END

15.6 185.2 32
104
Side view
Front view

4 holes-φ4.5 4 holes-φ5.5

TB4
TB1 TB3

TB2

24 9
239

Rear view 56

102
TB4
A1 A3
B1 B3 Panel cut-out
TB3
TB1
A1 B1
1 2
3 4
5 6
7 8
TB2
A1 B1
TB1,TB2,TB3: Screw terminal
(M3.5 Ring)
TB4: Screw terminal

A10 B10 TB4 is provided only for dual

A18 B18
RS485 model.
Terminal block

Figure 9 - GRD110 Outline Diagram

19
Industrial and Power Systems & Services Company
1-1,SHIBAURA 1-CHOME,MINATO-KU, TOKYO 105-8001,JAPAN
PHONE;+81-3-3457-3644 FAX;+81-3-5444-9168
http://www.toshiba.co.jp/f-ene/tands/english/protect/f_pc_top.htm