Richon Inner Cone Insulated Bushing for GIS & RMU Switchgear

Compact fully insulated inner cone bushing designed for high‑voltage cable connections in GIS switchgear, transformers, and ring main units, ensuring safe and maintenance‑free operation in modern power distribution systems.

(Inner Cone Plug‑in Bushing for GIS Switchgear and Transformer Cable Connections – Conforming to EN 50180 & EN 50181)

Product Overview

Richon Inner Cone Insulated Bushing is engineered for high‑voltage cable connections in gas insulated switchgear (GIS), ring main units (RMU), transformers, and other high‑voltage electrical equipment. The design conforms to international standards EN 50180 and EN 50181, ensuring compatibility with standard inner cone interfaces used in modern power distribution systems.

The bushing features a compact fully insulated structure that requires no routine maintenance while providing reliable electrical insulation and mechanical performance. It is designed to connect high‑voltage conductors of C‑GIS cabinets or transformers and is suitable for a wide range of insulated plastic power cables.

This inner cone system offers multiple configuration options for standard installations, testing purposes, and special applications, making it a reliable solution for utility networks, substations, and industrial power systems.

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Description

Key Features

Conforms to EN 50180 and EN 50181 international standards

Designed for connection to high‑voltage conductors of C‑GIS cabinets or transformers

Compact fully insulated structure requiring no maintenance

Reliable spring contact connection ensuring stable electrical contact

Inclined bolt design allowing easier installation without special tools

Integrated stress cone ensuring safe electrical stress control

Portable and compact design suitable for modern switchgear installations

100% routine testing ensuring electrical reliability and safety

Typical Applications

GIS plug‑in cable terminations for XLPE insulated single‑core or three‑core cables

Ring main unit (RMU) switchgear systems

Circuit breaker switchgear installations

High‑voltage motors and transformer connections

Capacitors, transducers, and sealing boxes

Utility substations and industrial power distribution systems

Standards

EN 50180 – Bushings above 1 kV up to 52 kV

EN 50181 – Plug‑in type bushings above 1 kV up to 52 kV

DIN 47637 – Inner cone interface standard

GB/T 12706.4 – Power cables with extruded insulation

IEC 60502.4 – Power cable accessories

Outline Dimensions

Part No. #1 — L1: 140 mm — L2: 137 mm — Conductor Diameter: 36 mm

Part No. #2 — L1: 140 mm — L2: 137 mm — Conductor Diameter: 39 mm

Part No. #3 — L1: 217 mm — L2: 165 mm — Conductor Diameter: 55 mm

Installation Parameters

Bushing Installation Position Φ1 — #1: 102 mm — #2: 102 mm — #3: 113 mm

Installation Hole Quantity — #1: 3 — #2: 3 — #3: 6

Termination Installation Position Φ2 — #1: 95 mm — #2: 102 mm — #3: 130 mm

Termination Installation Holes — #1: 3 — #2: 3 — #3: 3

Live Part Verification Position Φ3 — #1: 95 mm — #2: 95 mm — #3: 124 mm

Verification Hole Quantity — #1: 3 — #2: 3 — #3: 3

Electrical Performance

Rated Current — #1: 630 A — #2: 800 A — #3: 1250 A

Maximum System Voltage (Um) — #1: 36 kV — #2: 42 kV — #3: 42 kV

AC Withstand Voltage (50Hz, 5 min) — #1: 70 kV — #2: 117 kV — #3: 117 kV

Partial Discharge (1.73U0) — ≤5 pC

Lightning Impulse Withstand Voltage (1.2/50 μs) — #1: 170 kV — #2: 200 kV — #3: 200 kV

Maximum Short‑Time Current Withstand (1 s) — #1: 31.5 kA — #2: 40 kA — #3: 50 kA

Rated Impulse Current — #1: 125 kA — #2: 150 kA — #3: 150 kA

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