In order to protect the utility’s revenue it’s essential to do regular on-site tests on meter installations. If you are suffering huge losses you should focus on transformer operated meters first.
Those meter installations can be faulty at different points: Portable Digital Ct Pt Tester
Wrong Installation The screenshots below are taken from our wiring simulator. This simulator is part of the portable test equipment RS350.
In our example we have a three-phase four wire CT-operated meter 2500/5 A, like it’s installed in shopping malls and for small industry. We assume that the consumption is equal to the nominal load.
The wiring looks like this:
What happens when by mistake an instrument transformer for one phase is reversed?
We see that this simple mistake is causing a loss of 66%. Or in terms of money $165,600 per month. (20ct/kWh)
In Germany, utilities are inspecting CT installations every 6 months. CT/PT installations are inspected every 3 months.
The real loss reduction does mainly comes mainly from good maintenance of the transformer operated metering installations.
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