Tenaga Nasional Berhad
Tenaga Nasional Berhad
Tenaga Nasional Berhad
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Table 2.3.4.1: Voltage limits on switching of load<br />
Load Starting/Switching<br />
Limit of Voltage<br />
Change<br />
Starting/switching once or twice a year 6%<br />
Infrequent single starting/switching or<br />
disconnection of Load – once in two hours<br />
or more hours. Including capacitor or<br />
reactor bank<br />
Frequent starting/switching and/or<br />
disconnection of Load (e.g., Many times<br />
in a day)<br />
3%<br />
1%<br />
2.3.5 Voltage Fluctuations and Flicker<br />
2.3.5.1 The limits of Flicker that are acceptable on the distribution system are in accordance with the “Engineering<br />
Recommendation P28, Issued by The Electricity Council of UK in 1989 entitled Planning Limits for Voltage<br />
Fluctuation Caused by Industrial, Commercial and Domestic Equipment in the United Kingdom”. TNB uses the<br />
procedures contained in this document to plan the connection of Fluctuating Loads and applies the limits therein<br />
in measuring and monitoring the levels of Flicker at such points of connection.<br />
2.3.5.2.2 In accordance with the “Engineering Engineering Recommendation P2”, P2”, voltage fluctuations at a Point of Common<br />
Coupling with a fluctuating Load directly connected to the Distribution System shall not exceed:<br />
(a) % of the voltage level for step changes, which may occur repetitively. Any large voltage excursions other<br />
than step changes or less frequent step changes may be allowed up to a level of 3% provided that this<br />
does not constitute a risk to the distribution system or, in TNB’s view, any other party connected to the<br />
distribution system.<br />
(b) The planning limits for the Short and Long Term Flicker Severity applicable for Fluctuating Loads connected<br />
to the distribution system are as set out in the table below.<br />
TENAGA<br />
NASIONAL B E R H A D<br />
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