Siemens 8DJH User Manual

Operation
112/121 Revision 05 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DJH • 500-8067.9
22 Cable testing
22.1 Cable testing via cable plugs
Isolating and earthing the
feeder under test
➭ Disconnect the feeder under test.
➭ Make sure that the feeder in the opposite substation has also been isolated and secured
against reclosing.
➭ Verify safe isolation from supply.
➭ Earth the feeder.
Preparations ➭ Remove the cable compartment cover, see page 76, "Removing and mounting the cable
compartment cover".
➭ Remove the voltage transformers on the testing section and close the bushings in a
surge-proof way.
➭ Undo the screw-type cone at the T-plug or at the adapter.
➭ Fit cable test elements (e.g. measuring bolts) according to the operating instructions of the
plug manufacturers.
DANGER
High voltage! Danger!
➭ Isolate.
➭ Secure against reclosing.
➭ Verify safe isolation from supply.
➭ Earth and short-circuit.
➭ Cover or barrier adjacent live parts.
DANGER
Cable testing with connected cables represents a special stress for the isolating distance. If the
busbar of the switchgear under test or the opposite substation are live with operating voltage,
adequate measures must be taken in order to prevent overvoltages. Normally, the switch-
disconnector is not interlocked during the cable test.
➭ Fit switching prohibition signs.
➭ Secure the locking device (option) with a lock.
ATTENTION
The cables, cable plugs and voltage detecting systems may be damaged by too high test
voltages.
➭ Observe the specifications of the manufacturers of the cables, cable plugs and voltage
detecting systems (maximum test values).
①
Bushing
②
Measuring bolt
③
Test lead
④
Earthing connection of cable
shield
⑤
Earthing connection of plug
⑥
T-plug

Siemens 8DJH Specifications

General

Brand	Siemens
Model	8DJH
Category	Switch
Language	English

Summary

Safety Instructions

Signal Terms and Definitions

Explains DANGER, ATTENTION, NOTE, and symbols used in the manual.

General Safety Guidelines

Covers essential instructions, safety rules, and hazardous substances for safe operation.

Qualified Personnel and Due Application

Switchgear Description

Panel Types and Configurations

Switchgear Components

Three-Position Switch-Disconnector

Features and operating mechanism of the three-position switch-disconnector.

Vacuum Circuit-Breaker Type 2

Features, operating function, and mechanism of the vacuum circuit-breaker.

Interlocks and Safety Features

Technical Data and Specifications

General Electrical and Environmental Data

Covers insulation levels, currents, frequencies, ambient conditions, and protection degrees.

Switching Capacities and Classifications

Details switching capacities for disconnectors, circuit-breakers, and fuse combinations.

Installation Procedures

Transport, Storage, and Unpacking

Installation and Fastening

Floor Openings, Fixing Points, and Earthing

Electrical Connections

High-Voltage Cable Connection

Safety precautions and procedures for connecting high-voltage cables to the switchgear.

Commissioning

Pre-Energization Checks

Applying Operating Voltage and Energizing

Steps for energizing feeders, verifying connections, and applying operating voltage.

Switchgear Operation

Indicators and Control Elements

Operating Procedures

Safe Isolation Verification

Verification using HR/LRM Sockets

Procedure for verifying safe isolation using HR/LRM plug-in sockets.

HV HRC Fuse-link Replacement

Fuse Replacement Procedure

Cable Testing

Cable Plug Testing

Cable Sheath Testing