Three Phase Pad Mounted Transformer

Product Introduction

Terminal box transformer is an oil-immersed three-phase distribution transformer designed for commercial use. It is widely used in underground distribution load places such as shopping centers, schools, institutions and factories. It is designed to meet the efficient demand for power distribution in modern urban and industrial environments. It can be flexibly used in terminal applications with or without taps to adapt to different installation requirements.

The transformer uses aluminum or copper windings and is carefully optimized to maximize energy efficiency and footprint, ensuring the best power transmission in a limited space. Its high voltage design and neutral point drift-free characteristics enable the transformer to maintain a stable voltage output during operation, reducing the impact on the power system.

The terminal box transformer has the advantages of low loss, small size, high cost-effectiveness, etc., which can effectively reduce the user's operating costs. Its safe and environmentally friendly design concept ensures that the impact on the environment during use is minimized, which meets the requirements of modern society for sustainable development. At the same time, the transformer has a beautiful appearance design, which can blend harmoniously with the surrounding environment and enhance the overall visual effect.

Our terminal box transformers are designed and tested in strict accordance with industry standards, including applicable CSA, ANSI C.57, DOE and IEEE standards, to ensure that the quality and performance of our products reach the international advanced level. Through continuous technological innovation and optimization, our terminal box transformers not only meet the diverse needs of users, but also provide reliable guarantees for the safe, stable and efficient operation of the power distribution system.

Standard Features

●Mild steel, optional stainless steel tank

●Three-point latching door for security

●Removable sill for easy installation

●Stainless steel cabinet hinges and mounting studs

●Bolted-on cabinet with removable sill having the following depths :

/19" deep for 300kVA through 750 kVA

/22" deep for 1000kVA through 1500kVA

/24" deep for 2000 kVA through 3750kVA

/30" deep for 5000 Kva through 7500kVA

●For live front construction, externally clamped high voltage

●porcelain bushings with a single eyebolt,clamp-type connector (accommodates #6 AWG solid to 250MCM stranded conductors).

●For dead front construction, externally clamped high voltage bushing wells for loadbreak or non-loadbreak inserts.

●HV and LV compartment doors-hinged and lift-off type with 120°holding bars

●Steel HV/LV compartment barrier

●Padlocking facikity with one penta-head bolt on the LV compartment door and two penta-head bolts on the HV compartment door-including 3 point latching mechanism

●HV connection:

/Live front-external clamped and removable HV bushings with eyebolt, clamp type connector

●LV connection:

/ Externally clamped polymer & porcelain LV bushing with 4-12 Hole spades

●Oil drain plug for 500 kVA and below

●1”drain valve with sampler for 750 kVA and above

●Oil fill plug

●Five-legged core/coil assembly.

●Removable LV neutral ground strap; as required

●Nameplate per ANSI requirement

●Self-actuating pressure relief valve

●Lifting lugs (4)

Optional Accessories

1.Oil level gauge.

2.Liquid temperature gauge.

3.Pressure vacuum gauge

4.Welded cover with handhole

5.Oil drain valve with or without sampler.

6.Mechanical pressure relief device mounted on tank cover.

7.Primary termination:

•Externally clamped bushing wells with loadbreak inserts

•Integral loadbreak or non-loadbreak bushings

8.Secondary termination:

•Externally clamped bushings with NEMA4-hole, 6-hole, 8-hole, 10-hole or 12-hole spades

•Spade supports are available. They are provided for 8-hole spades and larger

9.Primary Switching:

•LBOR oil switch: one for radial feed

•Externally operated de-energized tap changer

•Externally operated dual voltage switch

•Externally operated △-Y switch

•2-position loadbreak oil switches

•4-position Tor V blade sectionalizing loop switches

10.Overvoltage Protection:

•Distribution class, metal oxide arresters,3-36kV

•Distribution class, valve-type lightning arresters, 3-27 kV

11.Over-current protection:

•Bayonet-type expulsion fuses with plastic drip cup mounted on each bayonet fuse

•Weak link cartridge fuses

•Bayonet type in series with internal partial-range current limiting fuses

•Secondary under oil circuit breaker

12.Additional construction options:

•Stainless steel tank and cabinet design

•Partial stainless steel design (cabinet sill and tank bottom)

•30" or 34" or 40" deen cabinet

•CT's or PT's, including mounting support

•LV externally mounted molded case breaker

•Externally mounted kWh meter

•Flip-top cabinet for low profile design

•Additional externally mounted nameplate

•Different paint color per requirement

13.Weathercover:

•Transformers may feature an optional weathercover over the cabinet which is hinged to allow clearance for replacement of the bayonet-type fuses

•The weathercover can be lifted easily into place and secured with a single supporting arm

•The weathercover requires no additional holddown hardware

Standard Design

Technical Data Sheet

Technical Data for Liquid-Filled Radial Feed Pad Mounted Transformer

Note: The above data is only subject to our standard design, special requirement can be customized.