SE-325 Series - Neutral-Grounding-Resistor Monitor

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The SE-325 Neutral-Grounding-Resistor Monitor is used on resistance-grounded systems up to 25 kV to monitor the integrity of the neutral-to-ground path and to detect ground faults. It measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor (NGR). The SE-325 coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact.

Access specifications, certifications, check availability and order parts below

Catalog #Supply
Voltage
VAC
Supply
Voltage
VDC
Relay Contacts ConfigIEEE Device NumbersRelay
Contact
Operating
Weight (lbs/g)Auto Manual ResetConformally coatedFrequencyGF Trip Level AGF Trip Time sHarmonic FilteringReset TypeRF Trip
Level
V
RF Trip
Time Delay
s
Compare
SE-3251201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325D1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325DN1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325DNT1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325DS1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325DSN1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325DSNT1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325DST1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325DT1201201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325E2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgLatchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325EN2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325ENT2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325ES2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325ESN2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325ESNT2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325EST2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325ET2401 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325N1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325NT1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325P1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5
SE-325S1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325SN1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 2.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325SNT1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgNon-latchingStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325ST1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)20
SE-325T1201 Form A (N.O.)50G - 50N - 51G - 51N - 59N - 86Fail-safe / Non Fail-safe0 KgStandard50; 60; ASD0.5 - 4.00.1 - 5.0StandardFront-panel switch/Remote Kit20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)5

pdf icon SE-325 Manual

A high-resistance-grounded system uses a neutralgrounding resistor (NGR) with a low let-through current to limit ground-fault current. This is an improvement over low-resistance- or solidly grounded systems because, in those systems, a ground-fault flash hazard exists and a ground fault can result in substantial point-of-fault damage.

pdf icon SE-325 Manual Russian

pdf icon SE-325 Cross Reference Russian

pdf icon SE-325 Manual Chinese

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pdf icon TN RG-07 SE-VS50010K Voltage Scaler

pdf icon TN RG-09 Single NGR for Multiple Sources

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pdf icon TN RG-12 Convert Ungrounded to Resistance Grounded

pdf icon TN RG-14 NGR Package Checklist

pdf icon TN RG-15 Implementing Resistance Grounding on Solidly Grounded Systems

SE-325 STP 3D Model

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11-1AU Earth-Fault CT Selection Flowchart Australia

EARTH-FAULT-CT SELECTION FLOWCHART...

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POLYCAST 200:5 CT TEST TECHNICAL INFORMATION...

pdf icon 11-7 Locating Phase Conductors in a Zero-Sequence CT Window

pdf icon Protection Relays and Controls Catalog - Mandarin

pdf icon SE-325 Datasheet


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