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Pacific Crest Grounding transformers are used to provide a ground path to either an ungrounded "Y" or a delta connected system and are used to.....
- Provide a relatively low impedance path to ground, thereby maintaining the system neutral at or near ground potential.
- Limit the magnitude of transient over voltages when re-striking ground faults occur.
- Provide a source of ground fault current during line to ground faults.
- Permit the connection of secondary loads if desired.
All ratings are designed in accordance with applicable ANSI, NEMA and IEEE standards.
Liquid-filled Transformers Grounding type 480 volts to 46 kV
Ratings
- Primary Voltage - all voltages through 46 kV - 250 kV BIL
- Secondary Voltage - 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 (750 kVA and above)
- 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
- When secondary bushings are provided, primary compartment accessible only after low voltage door is opened
- 1/2" liquid level plug
- Welded cover with handhole
Optional Features
- Five-legged core for wye-wye connections
- 50 cycle
- 55/65° C temperature rise
- High fire point liquid
- Loop feed construction
- Dead front construction
- Lightning arrestors
- Dial type thermometer
- Liquid level gauge
- 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
- Zig-zag designs
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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
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