8/14/2019 Datasheet of Grounding Transformer

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Datasheet of Grounding Trans ormer

8/14/2019 Datasheet of Grounding Transformer

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Pacific Crest Transformers

300 West Antelope Road Medford, Oregon 97503Tel : (541) 826 2113 Fax : (541) 826 - 8847

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Introduction

Pacific Crest Grounding transformers are used to provide a ground path to either an ungrounded or a

delta connected system and are used...

1. Provide a relatively low impedance path to ground, thereby maintaining the system neutral at or nearground potential.

2. Limit the magnitude of transient over voltages when re-striking ground faults occur.

3. Provide a source of ground fault current during line to ground faults.

4. Permit the connection of secondary loads if desired.

All ratings are designed in accordance with applicable ANSI, NEMA and IEEE standards.

Ratings

Primary Voltage - all voltages through 46 kV - 250 kV BIL

Secondary Voltage - when required all voltages through 15 kV

Frequency - 60Hz

Temperature rise 65 C

Consult factory for ratings not shown

Standard Features

Secondary spade connectors when required

Primary clamp type eyebolt connectors

Combination drain and sampler

Pressure test and upper filter press connection - 1 pipe plug

NEMA two hole ground pad

Corrosion resistant nameplate

Provisions for jacking and lifting

Base suitable for rolling or skidding

Pressure relief valve

Rugged steel plate tank reinforced with steel channel selections for strength and rigidity

Undercoated base

Door has three-point locking mechanism

Externally clamped bushings

8/14/2019 Datasheet of Grounding Transformer

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Pacific Crest Transformers

300 West Antelope Road Medford, Oregon 97503Tel : (541) 826 2113 Fax : (541) 826 - 8847

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When secondary bushings are provided, primary compartment accessible only after low voltage dooris opened

1/2 liquid level plug

Welded cover with handhole

Standard Tests

Each unit is subjected to the following tests:

Resistance

Ratio

Polarity

Phase relation

Core loss

Exciting current

Impedance

Load loss

Applied potential test

Induced potential test

Quality control impulse test

Pressure leak test

Optional Features

Five-legged core for wye-wye connections

50 cycles

55/65 C temperature rise

High fire point liquid

Loop feed construction

Dead front construction

Lightning arrestors

Dial type thermometer

Liquid level gauge

8/14/2019 Datasheet of Grounding Transformer

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Pacific Crest Transformers

300 West Antelope Road Medford, Oregon 97503Tel : (541) 826 2113 Fax : (541) 826 - 8847

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Pressure vacuum gauge

Pressure vacuum bleeder

Combination drain and sampler

Pressure relief device

Bay-o-net fuses

Weak links

Current limiting fuses

Loadbreak oil switch (es)

Primary current transformers

Gauges furnished with alarm contacts

Bolted cover with handhole

Zigzag designs