Model PTW3 Indoor Voltage Transformer
Indoor voltage transformer for metering, protective relaying, and control power; rated 60kV, 2-60 A, 750 VA.
Our PTW3 provides reliable indoor voltage transformer performance for metering, protective relaying, and control power.
Overview
The Model PTW3 Indoor Voltage Transformer is engineered for indoor service in utility, industrial, and commercial electrical distribution installations, targeting metering, protective relaying, and control power. It provides accurate voltage measurement across a wide operating range while maintaining stable long-term calibration.
Constructed with precision-wound cores and robust insulation, the PTW3 maintains rated accuracy through repeated thermal cycling, mechanical vibration, and environmental exposure typical of indoor installations. Key ratings: 60kV, 2-60 A, 750 VA. Design conforms to IEEE C57.13 (where applicable) for instrument-transformer accuracy and dielectric testing.
Typical deployments include substation switchgear, generator and transformer protection, revenue metering, feeder and motor protection, and control-room instrumentation. Refer to the attached data sheet for complete ratio, burden, accuracy class, and dimensional details; contact our engineering team for custom ratings, extended range, or non-standard configurations.
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Product Specifications
- Frequency
- 60 Hz
- Insulation BIL
- 60 kV
- Weight
- 34 lbs
- Mounting
- Indoor
- Application
- Metering
- Accuracy Class
- 0.3 WXMY 1.2Z at 100% rated voltage with 120V based ANSI burden; 0.6 WX, 1.2 MY at 58% rated voltage with 69.3V based ANSI burden
- Maximum System Voltage
- 5.6 kV
- Thermal Rating
- 750 VA at 30°C ambient; 500 VA at 55°C ambient
- Bushing Configuration
- Two-bushing and one-bushing configurations available
- Primary Terminals
- Unfused: 1/4-20 brass screws with one flatwasher and lockwasher; Fused: 1/4-20 brass screws with one flatwasher, lockwasher, and two nuts
- Secondary Terminals
- No. 10-32 brass screws with one flatwasher and lockwasher
- Core/Coil Construction
- Core and coil assembly encased in a plastic enclosure and vacuum encapsulated in polyurethane resin
- Recommended Minimum Spacing
- Unit-to-unit or to ground: 1.00 in minimum; HV to ground in air: 3.00 in minimum
- Canadian Metering Approval
- Approved for metering in Canada by Industry Canada, Approval No. T-215 Rev. 02
- Fuse Clip Cap Sizes
- CCS/CS fuse clips accept 1.0 in dia. caps with 5 in clip centers; CCL/CL fuse clips accept 1.63 in dia. caps with 5.88 in clip centers
- Ferroresonance Limiting Resistance (R FR)
- 230 ohms
Specification Table
| Primary V | Secondary V | Ratio (display) | Fuse Rating |
|---|---|---|---|
| 2400 | 120 | 20:1 | — |
| 2400 | 120 | 20:1 | 2.0E, 45,000A interrupting (sym), 5.5kV rated |
| 2400 | 120 | 20:1 | — |
| 2400 | 120 | 20:1 | — |
| 2400 | 120 | 20:1 | — |
| 3300 | 110 | 30:1 | — |
| 3300 | 110 | 30:1 | 2.0E, 45,000A interrupting (sym), 5.5kV rated |
| 3300 | 110 | 30:1 | — |
| 3300 | 110 | 30:1 | — |
| 3300 | 110 | 30:1 | — |
| 4200 | 120 | 35:1 | — |
| 4200 | 120 | 35:1 | 1.0E, 45,000A interrupting (sym), 5.5kV rated |
| 4200 | 120 | 35:1 | — |
| 4200 | 120 | 35:1 | — |
| 4200 | 120 | 35:1 | — |
| 4800 | 120 | 40:1 | — |
| 4800 | 120 | 40:1 | 1.0E, 45,000A interrupting (sym), 5.5kV rated |
| 4800 | 120 | 40:1 | — |
| 4800 | 120 | 40:1 | — |
| 4800 | 120 | 40:1 | — |
| 2400 | 120 | 20:1 | 2.0E, 45,000A interrupting (sym), 5.5kV rated |
| 2400 | 120 | 20:1 | — |
| 2400 | 120 | 20:1 | — |
| 2400 | 120 | 20:1 | — |
| 4200 | 120 | 35:1 | 1.0E, 45,000A interrupting (sym), 5.5kV rated |
| 4200 | 120 | 35:1 | — |
| 4200 | 120 | 35:1 | — |
| 4200 | 120 | 35:1 | — |
| 4800 | 120 | 40:1 | 1.0E, 45,000A interrupting (sym), 5.5kV rated |
| 4800 | 120 | 40:1 | — |
| 4800 | 120 | 40:1 | — |
| 4800 | 120 | 40:1 | — |
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