In this video you will see step by step guide how to configure STS/TD or TDX in order to measure TD.
Let us remember the steps before we configure the Firmware:
1. disconnect and de energise the PT
2. short - circuit the windings (Prim, Sec, Ter)
3. ground the test set and connect the cables
4. set up the measurement in the firmware by choosing where you
connected the generation and what do you want to measure and by
choosing the voltage and frequency (this step described here)
5. measure (CH and CHL, and maybe also CH + CHL)
6. we hit Emergency button before approaching the PT and we change the
generation from HV winding to LV winding in order to measure CL (we can
also measure CHL to confirm the consistence as well as CL + CHL)
7. we now remove short circuits and focus on bushings in bushings we can
measure C1 and C2
8. when generating to measure C1 we can generate 12 kV (keep in mind 10
kV is often test voltage of choice)
9. then we shift generation to measurement point down below and current
measurement to the top of the bushing - we do not exceed 1 kV
How to evaluate the results:
A) compare them to previous values
B) compare to allowed values
C) compare phases (bushings, cable phases)
D) compare to the same type of an asset working in similar conditions
If we suspect in deterioration we can do sweep (voltage or frequency) or
continue with maybe TD monitoring
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