© 2010 Littelfuse POWR-GARD ® Protection Relay Catalog 58 PROTECTION OVERVIEW P www.littelfuse.com/protectionrelays Ground Fault Protection Simplified Circuit Diagrams UNGROUNDED GROUND-FAULT DETECTION A PGR-3100 UNGROUNDED SUPPLY B C A L2 PGR-3200 L1 B C (Ground-Fault Indication System) (Ground-Fault Protection System) POWR-GARD ® POWR-GARD ® GROUND FAULT PROTECTION GFP DC GROUND-FAULT PROTECTION GROUND REFERENCE MODULE UNGROUNDED SUPPLY L2 PGR-2601 L1 + - (Ground-Fault Relay) POWR-GARD ®
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© 2010 Littelfuse POWR-GARD® Protection Relay Catalog58
PRO
TECT
ION
OVE
RVIE
W
P
www.littelfuse.com/protectionrelays
Ground Fault ProtectionSimplified Circuit Diagrams
UNGROUNDED GROUND-FAULT DETECTION
A
PGR-3100
UNGROUNDEDSUPPLY
B
C
A
L2PGR-3200
L1
B
C
(Ground-Fault Indication System)
(Ground-Fault Protection System)
POWR-GARD®
POWR-GARD®
GROuNd FaulT PROTECTION
GFP
DC GROUND-FAULT PROTECTION
GROUND REFERENCE MODULEUNGROUNDED
SUPPLY
L2
PGR-2601
L1
+
-
(Ground-Fault Relay)
POWR-GARD®
© 2010 Littelfuse POWR-GARD® Protection Relay Catalog 59 www.littelfuse.com/protectionrelays
P
PROTECTIO
N O
VERVIEW
Ground Fault ProtectionSimplified Circuit Diagrams
SINGLE-PHASE GROUND-FAULT PROTECTION
CT
L2
L1
GROUNDEDSUPPLY
L
N
PGR-5701
PGR-4704(Sensitive Ground-Fault Relay)
(Ground-Fault Relay)
POWR-GARD®
POWR-GARD®
GROuNd FaulT PROTECTION
GFP
THREE-PHASE GROUND-FAULT PROTECTION
A
GROUNDEDSUPPLY
CT
B
C
L2
L1
PGR-5701
PGR-4704(Sensitive Ground-Fault Relay)
(Ground-Fault Relay)
POWR-GARD®
POWR-GARD®
© 2010 Littelfuse POWR-GARD® Protection Relay Catalog60
PRO
TECT
ION
OVE
RVIE
W
P
www.littelfuse.com/protectionrelays
Ground Fault ProtectionSimplified Circuit Diagrams
GROuNd FaulT PROTECTION
GFP
PULSING GROUND-FAULT SYSTEMS
LOAD1
LOAD2
LOAD3
I
I
I
1
2
R
GF
GF
GF
RESISTANCE GROUNDING
PGR-5330SENSINGRESISTOR
NGR
L2
PGM-8325
CT
L1
(Resistance Grounded Relay)
(Neutral Grounding Resistor Monitor)
POWR-GARD®
POWR-GARD® NGR
TRANSFORMERSECONDARY
ZIGZAGTRANSFORMER
SENSINGRESISTOR
L2
CT
L1
(Included with PGN Series if necessary)
PGR-5330(Resistance Grounded Relay)
POWR-GARD®
POWR-GARD®
PGM-8325(Neutral Grounding Resistor Monitor)
(Delta-connected or wye-connected with inaccessisible
neutral)
© 2010 Littelfuse POWR-GARD® Protection Relay Catalog 61 www.littelfuse.com/protectionrelays
P
PROTECTIO
N O
VERVIEW
Ground Fault ProtectionSimplified Circuit Diagrams
NGRSENSINGRESISTOR
L2
NGRMONITOR
CT
L1
GROUND-FAULTMONITOR
L2L1
PGT-0400
CT
L2L1 (Ground-Fault
Relay Test Unit)
POWR-GARD®
L2
PGR-4300L1 (Generator Ground-Fault Relay)
POWR-GARD®
L2
PGR-5701L1
ALTERNATECT
LOCATION
(Ground-Fault Relay)
POWR-GARD®
GROUND-FAULT-RELAY TEST UNIT
GROuNd FaulT PROTECTION
GFP
GENERATOR GROUND-FAULT PROTECTION
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