Siemens 8DA12 User Manual

Medium-Voltage Switchgear
Type 8DA, Extendable Fixed-Mounted Circuit-Breaker Switchgear up to 40.5 kV
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OPERATING
INSTRUCTIONS
PART 1/2
Description, Operation
and Servicing
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Siemens 8DA12 Specifications

General

Rated Voltage	123 kV - 145 kV
Rated Current	630 A - 3150 A
Rated Frequency	50/60 Hz
Insulation medium	SF6
Type	Gas-insulated switchgear

Summary

Safety Instructions

Safety Rules

Lists essential safety rules for operating switchgear.

Qualified Personnel

Defines the qualifications required for personnel handling the equipment.

Description of Medium-Voltage Switchgear

Circuit-Breaker Panel

Switchpanel Components

Circuit-Breaker Design

Details the design and mechanical interlocks of the circuit-breaker.

Operating Mechanism Box

Explains the function and design of the operating mechanism box.

Three-Position Switch Function

Describes the function of the three-position switch, combining disconnector and earthing functions.

Instrument Transformers

Technical Data

Operation Procedures

Operating the Circuit-Breaker

Details how to operate the circuit-breaker, focusing on control board functions and manual operations.

Operating the Three-Position Switch

Explains how to operate the three-position switch, including control elements and levers.

Feeder Earthing and De-earthing

Details the procedures for earthing and de-earthing feeders, including safety rules.

Busbar Make-Proof Earthing Switch

Interlocks

Safe Isolation and Connections

Covers procedures for verifying safe isolation and correct terminal-phase connections.