
Catalog excerpts

High impedance DIFFERENTIAL MODULE Auxiliary resistors and varistors for high impedance differential schemes Key Benefits • Includes 2000-ohm resistors to provide security against the effects of CT saturation for through faults • Provides metal oxide varistors (MOV) to clamp secondary peak voltage to less than 2 kV • Use the HID in conjunction with an overcurrent relay for a separate phase, neutral, and negative-sequence overcurrent elements, including instantaneous, definite-time, and inverse time-overcurrent elements for backup overcurrent protection. applications • Single-zone bus protection, reactor protection, or sensitive restricted earth fault protection on grounded, wye-connected power transformer windings • High impedance differential protection for electrical machines such as generators or motors, including lockout logic. Overview High Impedance Differential protection is a well-known principle where stabilization resistors provides immunity against CT saturation during external faults. The HID module provides resistors together with voltage limiters (MOV) to be used with high-speed overcurrent relay in order to get a high impedance differential protection scheme. External CT's are differentially connected exactly as for traditional high impedance differential protection relaying. The overcurrent-relay unit connected in series with the resistors provides highspeed operation for bus faults involving high-magnitude currents. A voltagelimiting element is connected in parallel to avoid excessively high CT secondary voltages which can damage current inputs when bus faults occurred. The procedure for determining the necessary adjustments and the resulting sensitivity to low-current bus faults is very simple and straightforward, requiring only knowledge of the CT secondary excitation characteristics and their secondary impedance. little or no secondary leakage reactance. A latching relay is incorporated, whose contacts are connected to short circuit the resistors once the associated relay has tripped, preventing damage to the associated MOVs. The HID frontplate incorporates a Reset pushbutton to reset the latching relay once the fault has been cleared, in order to elimi- nate the resistors short circuit. The combination of HID module with a high speed overcurrent relay can be applied for bus protection in most cases where CTs having negligible leakage reactance are used. This generally includes any kind of current transformers with a toroidal core if the windings (on the tap used) are completely distributed about the core. Multilin HID High Impedance Differential Module All CTs must have the same rating, and should be a type, like a bushing CT with a distributed secondary winding, that has Digital Energy Multilin
Open the catalog to page 1
HID High Impedance Differential Module Typical Wiring I PHASE A DIFFERENTIAL CURRENT | PHASE B DIFFERENTIAL CURRENT >— | PHASE C DIFFERENTIAL CURRENT >— Protection Relay - WIRING A RELAY OUTPUT ' High Impedance Differential Module Latching relay / Power supply 1 1 winding transformer REF -1 resistor + 1 MOV 2 2 winding transformer REF - 2 resistors + 2 MOV 3 Busbar Applications 3 High impedance differential elements 0 Without latching relay View Guideform specifications Download the instruction manua Review applications notes and support documents View the UR Family brochure
Open the catalog to page 2All GE Grid Solutions catalogs and technical brochures
-
Static Var Compensator Solutions
12 Pages
-
Kelman TRANSFIX
2 Pages
-
Kelman MINITRANS
2 Pages
-
MIG
3 Pages
-
DTR
4 Pages
-
SPM
8 Pages
-
TOV
3 Pages
-
MDS SD Series
4 Pages
-
MIC
2 Pages
-
Multilin F60
9 Pages
-
Model PT7-1-150 & PT7-1-200
2 Pages
-
Models PT7-2-150 & PT7-2-200
2 Pages
-
Model PT6-2-125
2 Pages
-
Model PT6-1-125
2 Pages
-
Models PTW5-1-110&PTW5-2-110
2 Pages
-
Models PTG4-1-75 & PTG4-2-75
2 Pages
-
Models PTW3-1-60 & PTW3-2-60
2 Pages
-
Models PTG3-1-60 & PTG3-2-60
2 Pages
-
Models PT3-1-45 & PT3-2-45
2 Pages
-
Model 3PT3-60
2 Pages
-
MIG II
8 Pages
-
Model JVW-110C
2 Pages
-
Model JVW-5AC-1
2 Pages
-
Model JVW-5C
2 Pages
-
Multilin T60
9 Pages
-
Multilin 489
9 Pages
-
Multilin™ D25
8 Pages
-
Multilin D485
1 Pages
-
Multilin P485
1 Pages
-
MultiNet
3 Pages
-
iNET-II
4 Pages
-
MDS™ iNET 300
2 Pages
-
MDS iNET 900®
2 Pages
-
Multilin™ PQM II
8 Pages
-
Multilin L90
10 Pages
-
COSI
2 Pages
-
Reason DR60
4 Pages
-
Multilin 850
4 Pages
-
G650
8 Pages
-
Hydran M2
2 Pages
-
MultiLink ML3000 Series
12 Pages
-
TN1U
4 Pages
-
JungleMUX SONET Multiplexer
4 Pages
-
Multilin™ MM200
8 Pages
-
Multilin™ MM300
8 Pages
-
Multilin 339
16 Pages
-
Multilin 469
10 Pages
-
Multilin A60
6 Pages
-
Multilin 350
16 Pages
-
Multilin F650
12 Pages
-
Multilin 750/760
10 Pages
-
F35
8 Pages
-
345
12 Pages
-
745
8 Pages
-
Multilin G30
9 Pages
-
Transmission Overview
9 Pages
-
Air-Core Reactors
8 Pages
-
Multilin HardFiber System
14 Pages
-
Multilin UR & URPlus
18 Pages
-
Multilin C30
6 Pages
-
Voltage Regulators
16 Pages
-
g3 Technology
2 Pages
-
Rectifier
4 Pages
-
RMIO
2 Pages
-
MiCOM Agile P54A/B
2 Pages
-
MultiSync™ 100
6 Pages
-
Multilin G60
9 Pages
-
Multilin D400
12 Pages
-
GL 107X
2 Pages
-
Disconnectors
12 Pages
-
CGVB-05
2 Pages
-
KOTEF
4 Pages
-
Adjustable Height Sub Base
2 Pages
-
HV Transmission Solutions
8 Pages
-
FK
4 Pages
-
B65
4 Pages
-
Safe-NET Network Transformer
8 Pages
-
Green Power Transformers
4 Pages
-
COSI-RogoFlex
2 Pages
-
Grid-GA-L3-COSI_CEVT
2 Pages
-
P50 Agile P154 / P253
4 Pages
-
MiCOM Agile P24x
8 Pages
-
239 Motor Protection
8 Pages
-
Power Transformers
8 Pages
-
smorb
3 Pages
-
MIF II
8 Pages
-
SR family
2 Pages
-
735/737
4 Pages
-
dtp
5 Pages
-
IEC Oil Filled & SF
12 Pages
-
Gas Insulated Switchgear
24 Pages
-
Multilin UR & UR Plus
18 Pages
-
M60
8 Pages
-
MDS Orbit Platform Brochure
12 Pages