1.Training Introduction: Understanding Three Phase Pad Mounted Transformers
This training is designed to help employees understand the basic knowledge of three phase pad mounted transformers, covering the definition, characteristics, classification, and structure of three phase pad mounted transformers. By mastering this content, employees can better improve work efficiency and product service quality.
2. Training Content Overview
2.1 Definition
A three phase pad mounted transformer is a ground-mounted power distribution transformer installed in a steel cabinet with a lock and fixed to a concrete base. All live connection points are securely enclosed in a grounded metal housing, allowing installation without a fenced protective area.
These transformers are typically used at service branch points of underground power distribution lines, reducing the main voltage on the line to a lower secondary voltage delivered to power users. A single unit can supply electricity to a large building or multiple homes.
Compact Design – Space-saving and suitable for various environments
High Safety – All live parts are enclosed in a grounded housing
Installation Flexibility – Suitable for public spaces without fencing
Built-in Protection Device – Enhances reliability and performance
Easy Maintenance – Simple access and servicing procedures
Standard
IEEE Standard
CSA Standard
Front-End Design
Dead Front
Live Front
Incoming Line Configuration
Loop Feed
Radial Feed
| Door | Door Handle | Pentagon Bolt |
Fuel Tank Structure
| Enclosure | Door Hinge | Tamper-Proof Enclosure | Lifting Lugs |
| Tank | Radiator | Jacking Pads |
Forward Cabin Section
| Bay-O-Net Fuse | Drip Tray | Load Break Switch | Parking Stand |
| High Voltage Neutral (H0) | Grounding (Door and Enclosure) | Grounding Assembly (Busbar) | Drain Valve with Oil Sample Valve |
| Drain Valve with Oil Sample Valve | Load Break Insert | Grounding Strap | Low Voltage Bushing (Terminal) |
| Door Lock | Warning Label | Top Oil Thermometer | Oil Level Gauge |
| Vacuum Pressure Gauge | Pull Ring Type Pressure Relief Valve | Upper Oil Filling Valve | Nameplate Pad |
| Tap Changer |
| Parameters | Specifications |
| Standards | IEEE C57.12.34 CSA C227.4-21 (Dead front) CSA C227.5-08 (Live front) |
| Efficiency | DOE 10 CFR Part 43 CSA C802.1 / C802.3 Standards NEMA TP-1 |
| Typical Ratings (kVA) | 45, 75, 112.5, 150, 225, 300, 500, 750, 1000, 1250,1500, 1750, 2000, 2250, 2500, 2750,3000, 3750, 5000,7500,10000 |
| Primary voltage (kV) | 2.4-46 (typical voltages as below) |
| 3.5-6.9 | 2.4, 4.16, 4.8 |
| 6.9-11 | 6.9, 8.3 |
| 11-17 | 12, 12,47, 13.2, 13.8, 16.34 |
| 17-26 | 20.78, 22.86, 23, 23.9, 24.94 |
| 26-36 | 33, 34.5 |
| >36KV | 44, 46 |
| Secondary voltage(V) | 208-34500 |
| Connections | Delta or Wye |
| Cooling Class | ONAN(F), KNAN(F), LNAN(F) |
