Plausibility checking of current transformers in substations

Details Plausibility checking of current transformers in substations Plausibility checking of current transformers in substations

2005-03-22

2005-03-22

Picard, Leo (Department: 2125)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

C361S035000, C700S292000, C700S295000, C700S297000, C324S500000, C324S512000

Reexamination Certificate

active

06870719

ABSTRACT:
The invention relates to a method, a computer program and a device (20) for the plausibility checking of current transformers (7) in an electrical switchgear assembly (1) and to a switchgear assembly (1) having such a device (20). According to the invention, zones (1a, 1b, 1c) bounded by current transformers (7) and possibly by open switches (3-5) are detected for an instantaneous topology of the switchgear (1), in each zone (1a, 1b, 1c) the signed current measurement signals are added and in the case of significant deviations of the current sum from zero, all current transformers (7) of the associated zone (1a, 1b, 1c) are identified as being problematic. Exemplary embodiments relate to, among other things: a warning counter (2e) for problematic current transformers (7); in the case of a defective current transformer (7), an operation with calculated currents or an automatic combining of zones (1a, 1b, 1c); and coordinating the plausibility test with switching actions. Advantages are, among other things: the method is independent of the complexity and operating state of the switchgear (1); dynamic topology tracking; high information content of the plausibility test; and access to current measuring values already available in the substation control system (2).

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