What is the Pad Mounted Transformer?
Pad mounted transformer is a type of distribution transformer, which is widely used in North and South American markets. The large and small green boxes in streets, parks, hotels, countryside, residential or commercial areas are pad mounted transformers. They are 3 phase pad mounted transformers or single phase pad mounted transformers.
ANSI single-phase pad-mounted transformers come equipped with a clamshell cabinet for ease of opening and uninhibited access to connections. The versatility of the design allows for various protective and switching configurations.
ANSI three-phase pad-mounted cabinet offers a unique cabinet that features a one-piece sloped cabinet weather cover to effectively shed water and allow easier access into the cabinet compartment. The transformer can be configured for live and dead front high voltage connections along with radial or loop feed. Various switching and protection schemes can be integrated into the unit making for a low profile, reliable and multi-functional transformer.
Three-phase, pad-mounted transformers can be outfitted with a TPC protection system compensating for capacitive earth fault current in underground cables for the protection and safety of sensitive loads.
Accessories for Pad-Mounted Transformers
Bushing Insert: Available as single-pass or double-pass bushings, matching voltage levels (15kV, 25kV, 35kV) with corresponding pipes.
Insulation Protective Cap: Safeguards high-voltage bushing during transportation.
LV Bushing : Externally clamped bushings with various spade hole configurations (NEMA 4-hole, 6-hole, 8-hole, 10-hole, or 12-hole).
Bay-O-Net Fuse: Provides protection against excessive current and temperature.
Loadbreak Switch: Available in two-position and four-position variants, used in different transformer feed configurations.
Oil Level Gauge: This gauge monitors the level of insulating oil within the transformer oil tank.
Oil Temperature Gauge: A gauge to measure the temperature of the insulating oil within the transformer tank.
Pressure Vacuum Gauge: This gauge assesses the air pressure inside the transformer tank.
Oil Injection Valve: Used for injecting insulating fluid into the transformer when required.
Two or Three-Phase Magnex Interrupter: Used for circuit interruption in two or three-phase configurations.
Oil Drain Valve: Enables draining excess liquid from the transformer when oil levels are high or for maintenance purposes.
Oil Arrester: Offers surge protection.
Current Limiting Fuse: Utilized in conjunction with the Bay-O-Net fuse for current limiting protection.
IFD (Fault Indicator): Detects and indicates faults.
Tap Changer: Available in five-position and seven-position variants for voltage adjustment.
Kirk Key Interlock: An anti-theft design for enhanced security.
Insulating Oils: Both mineral and vegetable oils are used.
Dual Voltage Switch: Employed in dual high voltage designs.
Secondary Under Oil Circuit Breaker: A component for circuit protection.
