EN Transformer Bushing: 10 Models in Three Groups Covering 1~36kV, 250~3150A

Product Overview

This page summarizes Xingda's transformer bushings manufactured to the EN (British/European) standard system — 10 standard models in three groups, covering 1~36kV and 250~3150A. All are porcelain construction, supplied complete with tank-cover openings (Φ28~Φ90) and mounting fittings.

Model designation is straightforward: EN – voltage / current — e.g. EN-24/250 is the 24kV / 250A bushing; reinforced-creepage versions carry the suffixes .01 / .02. Internal codes follow XD.current.voltage.EN. Voltage and current — two parameters fix the model.

The three groups: ① 1~3kV small-current (250~630A, three models); ② 1kV high-current (1000~3150A, four models with flat terminal pads); ③ 24~36kV MV (250A, three models, of which the two 36kV types are reinforced-creepage versions). The EN series is highly complementary to the DIN series — similar outlines at the same voltage steps with slightly different interface dimensions — allowing customers to match either standard system on the same transformer.

Models & Specifications

Table 1 | 1~3kV small-current group (250~630A)

Table 2 | 1kV high-current group (1000~3150A, flat terminal pads)

※ Terminal pads: 2 holes for 1000~1250A, 2~3 holes from 2000A (column d2 = n×hole Ø); pad sizes a2×a2 / a1×a1; h3 is the thread-length range (printed 3"6 / 6"10 in the catalog, interpreted here as 3~6 mm / 6~10 mm).

Table 3 | 24~36kV MV group (250A; the 36kV types are the .01/.02 reinforced-creepage versions)

※ MV group: uniform cover opening d0=78 with 4-M10 fixing holes (Φ58 PCD); E / C are the side offsets of the outdoor terminal. See the checklist for the h3 readings.

Mounting & Fittings

The LV group locates on cover openings of Φ28 / Φ45; the high-current group on Φ56 / Φ70 / Φ90, with terminal pads from 60×60 up to 120×120, hole patterns of 2×Φ6.7 to 3×Φ13, and threads rising from M30×2.0 to M48×3.0 with the current rating.

The MV group uses a uniform Φ78 opening (4-M10, Φ58 PCD). The two EN-36/250 versions .01 / .02 reinforce the creepage to 995 mm and 1116 mm respectively, suited to heavily polluted and humid areas.

Typical Applications

Why Xingda

The EN series is fully manufactured by Tianjin Xingda. Tooling for all 10 standard models is in place and supply is stable; listed dimensions refer to standard products, and non-standard sheds, extended heights and special openings can be customized to customer drawings. The same factory supplies EN, DIN, ANSI, NBR Brazilian and GB bushing lines, so a transformer manufacturer can equip both export and domestic units from a single purchase. Every bushing is delivered with sealing and mounting fittings, ready to assemble on the tank cover.