Earth applied for personal enhanced protection is required- crucial where induction from extra high voltage are crossing the isolated section of the line. Protection from possible generator connection Charging from possible lightening strikes .
RELEVANT PERMIT This is the permit issued for works under an isolated section where a permit has been issued. The permit is issued to enhance safety and the awareness of such works to original PTW holder and control Engineer .
Limitation-of-Access As the statement indicates , the portion where work is to be carried out is well defined and signed document issued to compel the recipient to adhere to given instructions. Works where LOA- is issued; Climbing of towers and gantries where live conductors and other parts are live. When working on circuit breaker cubical
Limitation-of-Access When working on ground mounted transformers within the substation When working on cable terminations within the substation and where other live parts are in close proximity. When working on auxiliary equipments.
Limitation-of-Access It has 4 sections namely Issue –state location of work, work involved any remarks, the competent person, the authorised person and the system control engineer. Receipt-sign for acknowledgement Clearance-confirmation of completion of work. Cancellation-The LOA considered obsolete
FORM OF SANCTION -FOR-TEST It has four sections • Issue-states the receiver, accept the works and conditions. • Receipt –personal responsibility confirmed by signing the document. • Clearance-withdrawal of men and equipments, materials from the specified point of and removal of CME. • Cancellation –the permit is rendered obsolete.
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- Spring '18
- Professor Obura Oluoch
- Electrical Engineering, Electrical substation, PTW, ELECTRICAL LIMITITION OF ACCESS