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发表于 2012-6-2 10:09:14
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On-Line Tap Changer' U5 z+ J# F' l. ]: k
All transformer components are equipped with an on-line tap changer. When the tap changer is enabled, a diagonal line will appear on the component graphic, labelled Tap. 0 x6 d( z9 C! ]5 `. e. t
A change in tap setting is modeled as a change in the turns-ratio of the transformer. The per-unit leakage reactance and magnetizing currents, specified for 100% tap, are used to calculate admittances for the new voltage rating, corresponding to the tap setting.
* o9 L X6 D2 S! o3 S* dEXAMPLE:- X/ l- Z0 v9 [
Let us assume for simplicity, that a transformer is configured as Y-Y, with winding voltages rated at 10 kV primary and 100 kV secondary, and a tap changer is placed on the primary winding. The turns-ratio for this transformer is of course 1:10.
' S5 p2 M: C8 l' HAn on-line tap input of 1.0 corresponds to a 100% tap (i.e. no tap adjustment). If the tap input value is adjusted to say 1.05, then the turns-ratio would become 1.05:10 or 1:9.52381.2 r; m2 X/ x) M$ k- f
It is possible to have a continuous change of tap, but this would require a re-ordering of the network solution every time step. It is more practical to change tap settings in steps, either through manual adjustment, using a slider or rotary switch, or from a controller with appropriate delays and steps built in. |
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