Tenaga Nasional Berhad
Tenaga Nasional Berhad
Tenaga Nasional Berhad
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6.2 Specifications For Metering PTs and CTs<br />
Metering PTs<br />
Ratio : Vs / √3V<br />
0 / √3V<br />
* where Vs is the supply voltage given to the consumer<br />
Class : 0.5<br />
Burden : 100VA minimum.<br />
Sharing can be allowed provided separate fusing is provided and the burden of the shared load<br />
shall not exceed 10 VA. If the burden of the shared load is more than 10 VA, then 200 VA PT<br />
shall be used.<br />
Unit : 3 Nos. for each feeder<br />
Standards : BS.3941 or IEC 60044-2 (1997)<br />
Metering CTs<br />
For consumer taking 6.6kV, 11kV, 22kV and 33kV (Indoor breaker)<br />
Ratio : Is/5A<br />
* where Is is the primary ratio of the metering CT<br />
Class : 0.2<br />
Burden : 15VA<br />
Unit : 3 Nos. for each feeder<br />
Standards : BS.7626 or IEC 60044-1 (1996)<br />
For consumer taking 33kV (with outdoor breaker), 132kV and 275kV,<br />
Ratio : Is/1A<br />
* where Is is the primary ratio of the metering CT<br />
Class : 0.2<br />
Burden : 30VA<br />
Unit : 3 Nos. for each feeder<br />
Standards : BS.7626 or IEC 60044-1 (1996)<br />
6.3 Test Certificate<br />
All metering CTs and PTs together with the Manufacturer’s Test Certificate shall be submitted with test results of the<br />
installed equipment by the Registered Service Engineer. The schematic and wiring diagram of the particular consumer’s<br />
switchgear signed by a Professional Engineer shall be supplied to facilitate metering equipment installation.<br />
TENAGA<br />
NASIONAL B E R H A D<br />
59
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