Littelfuse POWR-GARD PGR-4704 User manual

POWR-GARD®
Ground-Fault Protection
PGR-4704 SERIES
Sensitive Ground-Fault Relay
PGR-4704 MANUAL
SENSITIVE GROUND-FAULT RELAY
JUNE 8, 2009
REVISION 3
TEST
400
30
300
200
100
55
500
1000
1500
2000
PWR
RESET
POWR-GARD
PGR-4704
SERIES
PGR-4704
SERIES
SENSITIVE GROUND-FAULT RELAY
TIME (ms)
CT TRIP
300
10
100
80
60
30
500
1000
3000
5000
LEVEL (mA)
Copyright © 2009 by Littelfuse, Inc.
All rights reserved.
Publication: PGR-4704-M
Document: P95-C704-00000
Printed in Canada.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com

This page intentionally left blank.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com

Page i
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
TABLE OF CONTENTS
Page
Table of Contents............................................................i
List of Figures..................................................................i
List of Tables ...................................................................i
1. GENERAL .......................................................... 1
2. OPERATION ...................................................... 1
2.1 Configuration-Switch Settings............................ 1
2.1.1 Relay Operating Mode............................. 1
2.1.2 Filter Selection.......................................... 1
2.1.3 CT Verification.......................................... 1
2.1.4 Reset Mode .............................................. 1
2.1.5 Analog Output .......................................... 1
2.2 Front-Panel Controls .......................................... 1
2.2.1 Ground-Fault Trip Level........................... 1
2.2.2 Ground-Fault Trip Time ........................... 1
2.2.3 Reset ........................................................ 1
2.2.4 Test ........................................................... 3
2.3 Front-Panel Indication ........................................ 3
2.3.1 Power........................................................ 3
2.3.2 Trip............................................................ 3
2.3.3 CT Verification.......................................... 3
2.4 Analog Outputs................................................... 3
2.5 Self Diagnostics .................................................. 3
3. INSTALLATION ................................................. 3
4. TECHNICAL SPECIFICATIONS ...................... 7
5. ORDERING INFORMATION............................. 8
6. PERFORMANCE TEST .................................... 9
LIST OF FIGURES
Page
1. PGR-4704 Outline and Mounting Details .......... 2
2. Typical Connection Diagram.............................. 3
3. PGC-5000-Series Current Transformers .......... 4
4. PGK-0055 Panel-Mount Adapter....................... 5
5 PGK-0060 Panel-Mount Adapter....................... 6
6. Ground-Fault-Test Circuit................................... 9
LIST OF TABLES
Page
1. Ground-Fault-Test Record ................................. 9
DISCLAIMER
Specifications are subject to change without
notice. Littelfuse, Inc. is not liable for contingent or
consequential damages, or for expenses sustained
as a result of incorrect application, incorrect
adjustment, or a malfunction.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com

Page ii
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
This page intentionally left blank.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com

Page 1
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
1. GENERAL
The PGR-4704 is a microprocessor-based
ground-fault relay for ac power supply systems that
require ground-fault detection as low as 10 mA. It is
uniquely suited for very sensitive ground-fault
protection on systems with significant harmonic
content. Its output relay can operate in the fail-safe
or non-fail-safe mode for undervoltage or shunt-trip
applications. The PGR-4704 has one output relay
with isolated normally open and normally closed
contacts for use in independent control circuits.
Additional features include LED trip and power
indication, autoreset or latching trips with front-panel
and remote reset, trip memory, test switch, self
diagnostics, 0- to 1-mA and 0- to 5-V analog outputs,
CT verification with LED indication, digital selector
switches, and switch-selectable algorithms for fixed-
frequency or variable-frequency applications.
Ground-fault current is sensed by a PGC-5000-
series core-balance ground-fault current transformer.
The trip level of the ground-fault circuit is digital-
switch selectable from 10 to 5,000 mA. Trip time is
digital-switch selectable from 30 to 2,000 ms.
2. OPERATION
2.1 Configuration-Switch Settings
See Fig. 1.
2.1.1 Relay Operating Mode
Switch 1 is used to set the operating mode of the
output relay. In the fail-safe mode, the output relay
energizes when the ground-fault circuit is not
tripped. In the fail-safe mode, non-volatile memory
retains the trip status of the PGR-4704. If tripped,
and the supply voltage is cycled, the PGR-4704 will
remain tripped, with the trip relay de-energized and
the TRIP LED on, until reset.
In the non-fail-safe mode, the output relay
energizes when a ground-fault trip occurs. In the
non-fail-safe mode, trip status is not retained in non-
volatile memory.
2.1.2 Filter Selection
Switch 2 is used to select the filtering algorithm for
settings less than 1,000 mA. The selections are for
fixed-frequency (50/60 Hz) or variable-frequency
applications. The FIXED FREQUENCY setting uses
a DFT filter that allows lower trip levels to be used
by rejecting harmonics that can cause nuisance
tripping.
The VARIABLE FREQUENCY setting uses a
peak-detection algorithm with a wider band width for
fault detection in variable-frequency drive
applications.
The peak-detection algorithm is used for settings
greater than 500 mA.
2.1.3 CT Verification
Switch 3 is used to enable CT verification. In
the ON position, a trip will occur if the PGC-5000-
series current transformer is disconnected.
2.1.4 Reset Mode
Switch 4 is used to select autoreset or latching
trips. See Section 2.2.3.
2.1.5 Analog Output
Switch 5 is used to select analog-output scaling.
Selecting % OF 5 A results in full scale output (1 mA or
5 V) when ground-fault current is 5 A. Selecting
% OF SETTING results in full scale output when
ground-fault current equals the trip-level setting.
2.2 Front-Panel Controls
2.2.1 Ground-Fault Trip Level
The LEVEL (mA) selection switch is used to set the
ground-fault trip level. For ground-fault detection, the
ground-fault trip level must be substantially below the
prospective ground-fault current. To avoid
sympathetic tripping, the trip level must be above the
charging current of the protected feeder.
2.2.2 Ground-Fault Trip Time
The PGR-4704 has a definite-time trip
characteristic. The TIME (ms) selector switch is
used to set the ground-fault trip time for coordination
with upstream and downstream ground-fault
devices. Coordination requires the same trip level
for all ground-fault devices in a system and the trip
time to progressively increase upstream. The
amount of equipment removed from the system will
be a minimum if the first ground-fault device to
operate is the one immediately upstream from the
fault.
2.2.3 Reset
If the Reset Mode switch is in the LATCHING
position, a trip remains latched until the RESET switch
is pressed or the remote-reset terminals (6 and 7) are
momentarily connected. In the non-fail-safe relay
operating mode, cycling the supply voltage will also
reset the PGR-4704.
If the Reset Mode switch is in the AUTORESET
position, a trip will reset when the fault is removed.
The reset circuit responds only to a momentary
closure so that a jammed or shorted switch will not
prevent a trip. The front-panel RESET switch is
inoperative when the remote-reset terminals are
connected.
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Page 2
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
110.0
6.3
113.0 (NOTE 3)
(4.33)
(0.25)
(4.45)
SIDE
55.0
(2.17)
75.0
(2.95)
FRONT
BOTTOM
8.7 37.5
55.0
(0.34) (1.48)
(2.17)
61.2
75.0
6.9
(2.41)
(2.95)
(0.27)
MOUNTING DETAIL
NOTE 2
(0.34)
TOP
OFF ON
FIXED
FREQUENCY
VARIABLE
FREQUENCY
FAIL-SAFE
LATCHING
%OF5A
NON-FAIL-SAFE
AUTORESET
% OF SETTING
3
4
5
2
1
CONFIGURATION
SWITCHES
NOTES:
1.
DIMENSIONS IN MILLIMETRES (INCHES).
2. MOUNTING SCREWS: M4 OR 8-32.
3. OVERALL DIMENSION WHEN MOUNTED ON
DIN EN50022 35 mm x 7.5 mm TOP-HAT RAIL.
4. ADJUSTMENT KNOBS ARE REMOVABLE.
5. CONFIGURATION SWITCHES SHOWN
IN DEFAULT POSITION.
RESET MODE
ANALOG OUTPUT
CT VERIFICATION
FILTER SELECTION
RELAY OPERATING MODE
NOTE 5
910111213141516
L2
NL1
TEST
400
30
300
200
100
55
500
1000
1500
2000
PWR
RESET
POWR-GARD
PGR-4704
SERIES
PGR-4704
SERIES
SENSITIVE GROUND-FAULT RELAY
TIME (ms)
CT TRIP
300
10
100
80
60
30
500
1000
3000
5000
LEVEL (mA)
44.5
1 2345678
S1 S2 RS
CT
ANALOG OUTPUT
0-1 mA 0-5 V
FIGURE 1. PGR-4704 Outline and Mounting Details.
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Page 3
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
2.2.4 Test
The TEST switch is used to test the ground-fault
circuit, the indication, and the output relay. When the
TEST switch is pressed for one second, a test signal is
applied to the ground-fault-detection circuit, the circuit
will trip, the TRIP LED will light, and the output relay
will operate.
2.3 Front-Panel Indication
2.3.1 Power
The green LED labeled PWR indicates presence of
supply voltage.
2.3.2 Trip
The red LED labeled TRIP indicates a trip. A solid
red LED indicates a ground-fault trip and a flashing
LED indicates a trip initiated by a CT fault. Two fast
flashes of the TRIP LED indicate a diagnostic trip. See
Section 2.5.
2.3.3 CT Verification
The green LED labeled CT indicates that a
PGC-5000-series current transformer is connected,
even if CT verification is disabled.
2.4 Analog Outputs
Non-isolated, 0- to 1-mA (terminal 3) and 0- to 5-V
(terminal 8) analog outputs indicate ground-fault
current sensed by the CT.
2.5 Self Diagnostics
A diagnostic trip is indicated by two fast flashes of
the TRIP LED. It can be caused by a problem
detected by the watchdog timer, or from an incorrect
reading from non-volatile memory. Press RESET or
cycle supply voltage. If the problem persists, consult
the factory.
3. INSTALLATION
Note: Mounting, terminal block connections and
wiring must conform to applicable local electrical
codes. Check all applicable codes prior to
installation.
This ground-fault monitoring system consists of a
PGR-4704 ground-fault relay and a PGC-5000-
series CT connected as shown in Fig. 2.
A PGR-4704 can be surface or DIN-rail mounted.
See Fig. 1. Panel mounting requires a PGK-0055 or
PGK-0060 Panel-Mount Adapter. See Figs. 4 and 5.
Use terminal 11 (L1) as the line terminal on ac
systems or the positive terminal on dc systems. Use
terminal 10 (L2/N) as the neutral terminal on ac
systems or the negative terminal on dc systems.
Connect terminal 9 ( ) to ground.
Pass the phase conductors through the CT
window and position them in the centre of the
opening (for 4-wire and single-phase systems, also
pass the neutral conductor through the CT window).
Do not pass ground conductors through the CT
window. In applications that require shields or drain
wires to pass through the CT window, return them
through the CT window before connecting them to
ground. Connect a PGC-5000-series CT to
terminals 4 and 5, connect the shield to terminal 5,
and ground terminal 5. See Fig. 3 for PGC-5000-
series CT dimensional drawings.
Remove the connection to terminal 9 for dielectric-
strength testing⎯all inputs and outputs have
ANSI/IEEE C37.90 surge-protection circuits that
conduct above 300 Vac.
PGC-5000 SERIES
S1 S2
STOP START
1M
1M
PGR-4704
RS
REMOTE RESET
V
FAULT
ANALOG
OUTPUTS
O/L
L N
45
13 14
15 16
6
7
89
L1
11 10
L2
N
ISOLATED CONTACTS
RESET
3
A
0-1 mA
0-5 V
NOTE:
1. USE ONE ANALOG OUTPUT ONLY.
CONNECTIONS TO BOTH WILL RESULT IN
INCORRECT OUTPUT VALUES.
NOTE 1
PGA-0500
FIGURE 2. Typical Connection Diagram.
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Page 4
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
NOTES:
1.
2.
DIMENSIONS IN MILLIMETRES (INCHES).
MOUNTING SCREWS: M5 OR 10-32.
PART
NUMBER
DIMENSIONS
AB C DE
PGC-5025
PGC-5060
PGC-5095
PGC-5130
PGC-5200
25.0 (0.98)
60.8 (2.39)
95.0 (3.74)
130.0 (5.12)
200.0 (7.87)
99.0 (3.90)
132.0 (5.20)
175.0 (6.89)
218.0 (8.58)
309.0 (12.17)
92.0 (3.62)
115.0 (4.53)
158.0 (6.22)
203.0 (7.99)
290.0 (11.41)
75.0 (2.95)
98.0 (3.86)
141.0 (5.55)
183.0 (7.20)
270.0 (10.63)
MOUNTING DETAIL
17.0
34.0
(0.67)
(1.34)
C
D
BOTTOM
33.5
5.5
17.0
(1.32)
(0.22)
(0.67)
C
D
TOP
(COVER REMOVED)
FRONT
1.5 14.0
(0.06) (0.55)
E
B
A
72.0
(2.83)
FLUX
CONDITIONER
42.0 (1.65)
60.5 (2.38)
82.0 (3.22)
103.5 (4.07)
150.0 (5.90)
FIGURE 3. PGC-5000-Series Current Transformers.
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销售热线：010-59790111
公司网址：www.apepo.com

Page 5
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
85.0
85.0
42.5
(3.35)
(3.35)
(1.67)
FRONT VIEW
85.0
72.0
60.0
2.0 (0.08) RAD
MAXIMUM
ALTERNATE
CONFIGURATIONS
4.0 (0.16) DIA
8.7 (0.34) DIA
4.3 (0.17) RAD
6.0 6.0
42.5
30.0
60.09.5 9.5
79.0
(3.35)
(2.83)
(2.36)(0.24) (0.24)
(3.11)
(1.67)
(1.18)
(2.36)
(0.37) (0.37)
INSTALLATION INSTRUCTIONS:
NOTE:
PANEL CUTOUT DETAIL
REMOVE BEZEL AND LATCH RELAY TO
BRACKET.
INSERT BRACKET THROUGH FRONT OF PANEL
CUTOUT AND SECURE WITH FLAT WASHERS
AND LOCKNUTS PROVIDED.
CONNECT WIRING TO TERMINALS.
INSTALL BEZEL USING 6-32 x 0.31 SCREWS
PROVIDED.
1.
2.
3.
4.
1. DIMENSIONS IN MILLIMETRES (INCHES).
110.0
75.0
(4.33)
(2.95)
PANEL THICKNESS
1.6 (0.06) TO 4.8 (0.19)
SIDE VIEW
55 mm (2.2) WIDE
RELAY
BRACKET
6-32
6-32
TEST
400
30
300
200
100
55
500
1000
1500
2000
PWR
RESET
POWR-GARD
PGR-4704
SERIES
PGR-4704
SERIES
SENSITIVE GROUND-FAULT RELAY
TIME (ms)
CT TRIP
300
10
100
80
60
30
500
1000
3000
5000
LEVEL (mA)
FIGURE 4. PGK-0055 Panel-Mount Adapter.
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销售热线：010-59790111
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Page 6
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
99.0
88.0
44.0
(3.90)
(3.46)
(1.73)
FRONT VIEW
99.0
72.0
60.0
2.0 (0.08) RAD
MAXIMUM
ALTERNATE
CONFIGURATIONS
4.5 (0.18) DIA
8.7 (0.34) DIA
4.3 (0.17) RAD
6.0 6.0
44.0
30.0
60.09.5 9.5
79.0
(3.90)
(2.83)
(2.36)(0.24) (0.24)
(3.11)
(1.73)
(1.18)
(2.36)
(0.37) (0.37)
INSTALLATION INSTRUCTIONS:
NOTE:
PANEL CUTOUT DETAIL
WITH COVER REMOVED LATCH RELAY TO
BRACKET.
INSERT BRACKET THROUGH FRONT OF PANEL
CUTOUT AND SECURE WITH FLAT WASHERS
AND LOCKNUTS PROVIDED.
CONNECT WIRING TO TERMINALS.
ATTACH COVER USING THUMB SCREWS
PROVIDED.
1.
2.
3.
4.
1. DIMENSIONS IN MILLIMETRES (INCHES).
2. MEETS NEMA3, IP53.
116.0
75.0
(4.57)
(2.95)
PANEL THICKNESS
1.6 (0.06) TO 4.8 (0.19)
SIDE VIEW
55 mm (2.2) WIDE
RELAY
BRACKET
TRANSPARENT
COVER (NOTE 2)
M4
M4
TEST
400
30
300
200
100
55
500
1000
1500
2000
PWR
RESET
POWR-GARD
PGR-4704
SERIES
PGR-4704
SERIES
SENSITIVE GROUND-FAULT RELAY
TIME (ms)
CT TRIP
300
10
100
80
60
30
500
1000
3000
5000
LEVEL (mA)
FIGURE 5. PGK-0060 Panel-Mount Adapter.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com

Page 7
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
4. TECHNICAL SPECIFICATIONS
Supply:
0U Option ......................... 2.5 VA, 120 to 240 Vac,
(+20, -55%) 50/60 Hz,
2.0 W, 100 to 240 Vdc,
(+20, -25%)
0D Option ......................... 2.0 W, 12 to 30 Vdc,
(+20, -25%)
0T Option.......................... 2.0 W, 40 to 55 Vdc,
(+20, -25%)
Trip-Level Settings .................. 10, 30, 60, 80, 100,
300, 500, 1,000, 3,000,
and 5,000 mA
Trip-Time Settings................... 30, 55, 100, 200, 300,
400, 500, 1,000, 1,500,
and 2,000 ms
Accuracies: (1, 2)
Trip Level: (3, 4)
1,000 to 5,000 mA..........+2, -10% (60 Hz)
+0, -12% (50 Hz)
60 to 500 mA..................+0, -10%, 10 mA min
30 mA.............................+0, -6 mA
10 mA.............................2 mA
Trip Time
(5) ........................5% of Setting,
20 ms min
Input:
Algorithms
(6)...................... DFT Digital or Peak
DFT 3 dB Frequency
Response ...................... 32 to 86 Hz
(<1,000 mA)
Peak 3 dB Frequency
Response ...................... 20 to 420 Hz
(<1,000 mA)
Peak 3 dB Frequency
Response ...................... 20 to 120 Hz
(≥1,000 mA)
CT ........................................ PGC-5000-Series CT
CT Detection.................... Open-Circuit Detection
Thermal Withstand:
Continuous ...................... 25-A Ground-Fault
Current
1-Second ......................... 400-A Ground-Fault
Current
Analog Output:
Modes………………………% of 5 A or % of Trip-
Level Setting
Range:
Terminal 3…………… 0 to 1 mA
Terminal 8…………….0 to 5 Vdc
Output Impedance:
Terminal 3…………….4,970 Ω
Terminal 8…………….220 Ω
Reset ....................................... Front-Panel Switch and
Remote N.O. Contact
Functional Test ....................... Front-Panel Switch
Output Relay:
Contact Configuration ....... Isolated N.O. and N.C.
Operating Mode ................. Fail-Safe or Non-Fail-
Safe
CSA/UL Rating ................. 8 A Resistive, 250 Vac,
8 A Resistive, 30 Vdc
Supplemental Contact Ratings:
Make/Carry 0.2 s .......... 20 A
Carry Continuous.......... 8 A
Break:
dc.............................. 30 W Resistive,
15 W Inductive
(L/R = 0.04)
ac ............................2,000 VA Resistive
1,400 VA Inductive
(PF = 0.4)
Subject to maximums of 8 A and
250 V (ac or dc).
Operating Mode ...................... Latching or Autoreset
Terminals ................................ Wire Clamping,
24 to 12 AWG
(0.2 to 2.5 mm2)
Conductors
Dimensions:
Height ..............................75 mm (3.0")
Width ...............................55 mm (2.2")
Depth...............................115 mm (4.5")
Shipping Weight.....................0.45 kg (1 lb)
Environment:
Operating Temperature ...-40°C to 60°C
Storage Temperature ......-55°C to 80°C
Humidity ...........................85% Non-Condensing
(1) Detection limit (A) = (setting in mA – 5,610) / -1.4.
(2) At 50 or 60 Hz unless otherwise noted.
(3) PGC-5000-series CT included.
(4) Maximum lead resistance of 2 Ω.
(5) Trip time at 3 x trip-level setting.
(6) Peak algorithm for trip-level settings ≥1,000 mA.
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销售热线：010-59790111
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Page 8
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
Surge Withstand ................. ANSI/IEEE 37.90.1-
1989 (Oscillatory and
Fast Transient)
EMC Tests:
Verification tested in accordance with EN 50263:2000
Electrostatic Discharge ...... IEC 61000-4-2,
EN 61000-4-2,
6 kV Contact Discharge
8 kV Air Discharge
Radiated RF...................IEC 61000-4-3,
EN 61000-4-3
10 V/m, 80-1,000 MHz,
80% AM (1 kHz)
10 V/m, 900 MHz,
200 Hz Pulse Modulated
Fast Transient................IEC 61000-4-4,
EN 61000-4-4
±2 kV Common Mode
±1 kV Differential Mode
Surge Immunity..............IEC 61000-4-5,
EN 61000-4-5
±2.0 kV Common Mode
±1.0 kV Differential Mode
Conducted RF................IEC 61000-4-6,
EN 61000-4-6
10 Vrms, 0.15-80 MHz,
80% AM (1 kHz)
Magnetic Field ...............IEC 61000-4-8,
EN 61000-4-8
50 Hz, 30 A/m (continuous)
50 Hz, 300 A/m
(1 to 3 seconds)
Voltage Interruption .......IEC 255-22-11,
EN 60255-11
100% for 2, 5, 10, 20, 50,
100, & 200 ms
MHz Burst ..................... IEC 255-22-1,
EN 60255-22-1
1 kV Differential Mode
2.5 kV Common Mode
RFI Compliance ................. FCC Part 15, Subpart B,
Class A – Unintentional
Radiators
Certification ...........................CSA (Canada and USA)
CE (European Union)
Complies to IEC 61010-1:2001 (2nd Edition);
EN 61010-1:2001 (2nd Edition) Safety Requirements
for Electrical Equipment for Measurement,
Control, and Laboratory Use – Part 1
5. ORDERING INFORMATION
PGR-4704-0
U Universal 120/240-Vac/Vdc
Supply
D 12/24-Vdc Supply
T 48-Vdc Supply
PGA-0500 ......... Analog Percent Current Meter
PGC-5025 ......... Current Transformer,
25.0-mm (0.98”) Window
PGC-5060 .........Current Transformer,
60.8-mm (2.39”) Window
PGC-5095 .........Current Transformer,
95.0-mm (3.74”) Window
PGC-5130 .........Current Transformer,
130.0-mm (5.12”) Window
PGC-5200 .........Current Transformer,
200.0-mm (7.87”) Window
PGK-0055 ......... Panel-Mount Adapter, NEMA 1
PGK-0060 ......... Panel-Mount Adapter, NEMA 3, IP53
PGK-0003 ......... Adapter Plate, GEC/MCGG
Consult factory for custom mounting adapters.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com

Page 9
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
6. PERFORMANCE TEST
Some jurisdictions require periodic ground-fault
performance tests. A test record form is provided
for recording the date and the result of the
performance tests. The following ground-fault
system tests are to be conducted by qualified
personnel.
a) Evaluate the interconnected system in
accordance with the overall equipment
manufacturer’s detailed instructions.
b) Verify proper location of the PGC-5000-series
CT. Ensure the cables pass through the CT
window. This check can be done visually with
knowledge of the circuit. The connection of the
current-transformer secondary to the PGR-4704
is not polarity sensitive.
c) Verify that the system is correctly grounded and
that alternate ground paths do not exist that
bypass the current transformer. High-voltage
testers and resistance bridges can be used to
determine the existence of alternate ground
paths.
d) Verify proper reaction of the circuit-interrupting
device in response to a simulated or controlled
ground-fault current. To simulate ground-fault
current, use CT-primary current injection. Fig. 6
shows a test circuit using the PGT-0400
Ground-Fault-Relay Test Unit. The PGT-0400
has a programmable output of 0.5 to 9.9 A for a
duration of 0.1 to 9.9 seconds. Fig. 6 shows the
use of resistors that reduce the injected current
to 10% of the PGT-0400 setting. Set the test
current to 120% of the PGR-4704 setting. Inject
the test current through the CT window for at
least 2.5 seconds. Verify that the circuit under
test has reacted properly. Correct any problems
and re-test until the proper reaction is verified.
e) Record the date and the results of the test on
the attached test-record form.
Note: Do not inject test current directly into
CT-input terminals 4 and 5.
PGT-0400
PGR-4704
RMT1
REMOTE
TEST 9
8
1
5
3
11 12
RMT2
L
L
N
N
L1
L1
OP1 OP2
L2
L2/N
FROM
POWER
SOURCE
LOAD
S1 S2
45
PGC-5000 SERIES
11
10
R1
R2
R1 = 10 , 10 W, 1%
R2=0.1 ,10W,1%
I = 1/10 PGT-0400 SETTING
W
W
TEST
I
TEST
FIGURE 6. Ground-Fault-Test Circuit.
TABLE 1. Ground-Fault-Test Record
DATE TEST RESULTS
Retain this record for the authority having jurisdiction.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com

Page 10
PGR-4704 Sensitive Ground-Fault Relay Rev. 3
Pub. PGR-4704-M. June 8, 2009 www.littelfuse.com © 2009 Littelfuse • POWR-GARD®
This page intentionally left blank.
北京天正恒业电器有限公司
销售热线：010-59790111
公司网址：www.apepo.com