· Site survey will be conducted to determine the appropriate location to assemble the test equipment and capacitor divider (preferably GIS off-loading platform area).
· HV winding of the IDT will be earthed inside the HV cable boxes.
· Before the start of the test ensure that the Transformer HV cable side oil treatment is completed and the cable box is filled with oil tested in the lab.
· GIS side to ensure that CB (Q0) is in Open condition and earth switch (Q52) in closed.
· Quality of the gas filled in the cable boxes to be tested and ensured for its purity.
· The terminations remote from the testing location to be barricaded and warning
· signs displayed to indicate testing is likely to be in progress.
· During the application of test voltage, access to the IDT / Basement room will be restricted and a watchman will be stationed near IDT area terminations as a safety precaution.
· AC resonant test set will be installed adjacent to the GIS into which the HV test adopters have been installed. If a connection cannot be made between the HV test set and GIS HV adopter in a single span an intermediate temporary support will be erected to support the HV test lead.
· All test equipment grounds will be securely connected to the substation ground system.
· Diesel genset will be the source of LV input power for the test equipment.
· Rigid safety barricades, warning signs, and flashing warning lights will be erected around the test site.
· All cable shields and link boxes will be in their service position except for SVL which will be shorted to avoid being damaged in the event of flash-over during testing.
· The HVAC test will commence with the measurement of cable insulation resistance between the conductor and insulation shield one phase at a time using 5KV meggar.
· Measured values will be recorded at the completion of one minute of measurement.
· Each conductor will be connected to the ground on completion of the insulation resistance test.
· Ground will be disconnected from the termination of the first cable to be tested.
· The HV output terminal of the test lead will be connected to the cable terminal via the low corona test lead.
· Cable HVAC test can be conducted one phase at a time or all three phases together as agreed by the client and depending on the availability of test adapters.
· All test reports should be available at the site before start of the HVAC test