Question

Discuss electrical safety procedures for working with : 

(i) Transformer,

(ii) Overhead lines,

(iii) Underground lines,

(iv) Switchgear, and 

(v) High voltage equipment. 

28 Mar 2018
Answer :
Word Count : 874

i) Transformer

1. When work is to be carried out on a transformer, both low and high tension breakers and isolators should be opened. Similarly, during isolation of transformers to which potential transformers are connected, such potential transformers should be isolated.

2. Before starting any work on a transformer installation, it is important to check carefully for back feed, abnormal voltage or other dangerous conditions. Unusual circuit conditions may exist which require special consideration.

3. Whenever transformers are replaced, the new transformer should be checked carefully for voltage, polarity and phase sequence before taking into service.

4. Area should always be cordoned off and Safety tagging should be done prior to starting the job on the transformer.

(ii) Overhead lines

The following is a list of suggested practices that should be followed when working near overhead power lines.

(1) Equipment operators and users must respect the safe limit of approach distances specified in section 225 of the OHS Code.

(2) A competent signaller as described in section 191 of the OHS Code should be used. The signaller’s only responsibility is to make sure that the equipment operator does not get closer than

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