Littelfuse SE-325 Series Manual de usuario descargar pdf

Protection Relays & Controls

Rev: 4-A-050213

Based on Manual Rev 12

Neutral-Grounding-Resistor Monitoring

SE-325 SERIES (PGM-8325)

Neutral-Grounding-Resistor Monitor

Description

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.

ORDERING NUMBER CONTROL POWER

SE-325 120 Vac

SE-325D 120 Vac/Vdc

SE-325E 240 Vac

Ordering Information

Simpliﬁed Circuit Diagram

NGR

SE-325 SERIES

ER SERIES

(Sensing Resistor)

(NGR Monitor)

FEATURES BENEFITS

Continuous NGR

monitoring

Detects resistor failure within seconds, reduces

transient-overvoltage risk, removes risk of ground-

fault-detection failure

Ground-fault

Detection

Main or backup protection to detect a ground

fault anywhere on the monitored system

Adjustable pickup

(0.5 - 4 A)

Select greatest sensitivity without

false operation

Adjustable time delay

(0.1 - 2 s)

Adjustable trip delay allows system coordination

Output contacts Form A output contact

Selectable contact

operating mode

Selectable fail-safe or non-fail-safe operating

modes allows connection to shunt or undervoltage

breaker coil or alarm system

Features & Beneﬁts

ACCESSORIES REQUIREMENT

CT200 Series Required

ER Series Required

SE-MRE-600 Optional

RK-325, RK-325I, RK-302 Optional

RK-13 Optional

NGRM-ENC Optional

Speciﬁcations

IEEE Device Numbers Ground Fault (50G/N, 51G/N),

Overvoltage (59N), Lockout Relay (86),

Checking Relay (3)

Input Voltage See ordering information

Dimensions H 150 mm (5.9"); W 109 mm (4.3");

D 100 mm (4.0")

GF Trip Level Settings 0.5-4.0 A

GF Trip Time Settings 0.1-2.0 s

RF Trip-Level Settings 20-400 Vac (≤5 kV systems)

100-2,000 Vac (>5 kV systems)

Contact Operating Mode Selectable fail-safe or non-fail-safe

Reset Button Standard feature

Output Contacts Form A

Approvals CSA certiﬁed,

UL Listed (E340889),

C-Tick (Australian)

Conformally coated Standard feature

Warranty 5 years

Mounting Surface

CT200 Series Current Transformer

Required CT detects ground-fault current.

Accessories

ER Series Sensing Resistor

Required interface between the power

system and the SE-325. Eliminates

hazardous voltage levels at the monitor.

RK Series Remote Indication and Reset

Optional panel-mounted remote indication

and reset assemblies. Available in NEMA 1 or

NEMA 4 conﬁgurations.

Consult manual online for additional ordering options.

Littelfuse.com/se-325

SE-325 SERIES (PGM-8325) 1

Indice de contenidos

Pagina 1 - SE-325 SERIES (PGM-8325)

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