![]() Īll equipment should be properly insulated.The following general guidance applies to the design and operation of electrical devices (single-line/ one-line diagrams are discussed in Chapter 1: Safety in Design): In principle, the same situation and adjustments characterise the phase co-ordinate load-flow analysis Several existing conventional (one-line diagram) load-flow programs already allow the generator terminal voltage magnitude to be unknown and to be adjusted according to the voltage value of a remote-controlled bus-bar. At generator bus-bars where a P| V| specification is given, the value of P is the total active power output of the machine and | V| can be either E a or V p or any other controlled bus-bar voltage. By any of the usual load-flow techniques these equations can then be solved iteratively. To a first approximation the term y N0| V N| 2/ E * a can be neglected in comparison with the magnitude of the term Σ S * / E a *.įor each generator the machine admittance matrix Y abc can be added to the polyphase admittance matrix representing the network of lines, transformers and admittance loads. ![]() ( − y 1 − y 0 Y a b c − α 2 y 1 − y 0 − α y 1 − y 0 − y 1 − α y 1 − α 2 y 1 3 y 1 0 − y 0 − y 0 − y 0 0 ( 3 y 0 + y N 0 ) ( V p V q V r E a V N ) = ( I p I q I r Σ S * / E a * + y N 0 | V N | 2 / E * a 0 )
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