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Maintenance of Substation Equipment | Operation And Maintenance Of Substation

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Maintenance of Substation Equipment | Operation And Maintenance Of Substation

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  1. Maintenance of Substation Equipment

  2. Introduction • The switchgear and protective relaying system should be always alert to operate against an unexpectedly fault. • Switchgear which was in quiescent state has to operate immediately. For such an operation, regular and detailed maintenance is necessary. • The lack of maintenance may result in failure in operation. • The maintenance requirements of static equipment's like transformers, capacitors etc. are much less compared to other dynamic equipment's like circuit breakers, motors etc.

  3. Breakdown Maintenance Versus Preventive Maintenance • A performance record of each critical component is maintained and basic decisions on the service life of the component and the total service it has put in. Repairs or replacements are made to ensure that no breakdown occurs at any time during the service. • Preventive maintenance is carried out in planned manner. Breakdown maintenance is carried out as and when necessary. For switchgear and protective equipment, preventive maintenance is recommended because failure of a switchgear cannot be permitted.

  4. Choice of Activities Inspection: This refers to the maintenance activity which comprises careful observation/scrutiny of the equipment without dismantling it. It usually includes visual and operational checks. Servicing: This refers to cleaning, adjustment, lubrication and other maintenance functions without dismantling the equipment. Examination: This refers to inspection with necessary dismantling, measurements and non-destructive tests to obtain data regarding the condition of components/sub-assemblies. Overhaul: This refers to the work done with the objective of repairing/replacing worn-out parts and defective parts. The equipment, sub-assemblies are dismantled partly or completely. The condition of components is inspected. Dimensions of worn-out components are measured. The components worn-out beyond acceptable limit are replaced. The assembly is followed by functional checks and measurements to ensure satisfactory operation.

  5. Guidelines for Maintenance of Switchgear The requirement of inspection, servicing examination and overhaul vary with: Environmental aspects such as dust, chemical fumes, moisture/humidity, ambient temperature variations, etc. Operating duty; frequency of operation, rated current. Switching duty severity, e.g. repeated operations.

  6. Maintenance of Quenching Medium Contacts

  7. Maintenance of Contacts

  8. Important Checks on Circuit Breakers during Routine Maintenance

  9. Check List and Maintenance Schedule for Circuit Breakers

  10. Maintenance of Circuit Breakers General Inspection Cleaning and Drying Insulation Surface Interrupter Mechanism

  11. Click Here For Power System Protection

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