Motor and heating circuits that operate on DC, andĪ diagram of connections for all substation equipment that take supplies from the DC system should be provided.Protection and control systems for transformers, busbars, transmission lines and feeders,.These diagrams contain information corresponding to equipment such as: Voltage transformer circuits should be drawn physically separated from the rest of the circuits, and the connections to the coils of the instruments that require a voltage signal should also be indicated.Īs a minimum, the AC diagram of a transformer should include all the equipment in the bay between the high voltage busbar and the secondary bushings of the transformer.ĭiagrams of DC connections illustrate the direct current circuits in a substation and should clearly show the various connections to the DC auxiliary services. For example, for power transformers, the voltage ratio, power rating and vector group should be provided for power circuit breakers, the nominal and short-circuit current ratings the transformation ratios for voltage and current transformers, and the nominal voltage of lightning arresters.
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