Datasheet of Grounding Transformer

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 near
ground 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 65º 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
Pacific Crest Transformers 2
300 West Antelope Road – Medford, Oregon 97503
Tel : (541) 826 – 2113 Fax : (541) 826 - 8847

• When secondary bushings are provided, primary compartment accessible only after low voltage door
is 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
• 55/65º C temperature rise
• High fire point liquid
• Loop feed construction
• Dead front construction
• Lightning arrestors
• Dial type thermometer
• Liquid level gauge
Pacific Crest Transformers 3
300 West Antelope Road – Medford, Oregon 97503
Tel : (541) 826 – 2113 Fax : (541) 826 - 8847

• 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
Pacific Crest Transformers 4
300 West Antelope Road – Medford, Oregon 97503
Tel : (541) 826 – 2113 Fax : (541) 826 - 8847