The zero-sequence current transformer is part of the protective disconnection equipment in 6 kV, 10 kV and 110 kV systems where neutral grounding is used. It is capable of preventing short circuits and, as a result, damage to equipment and/or loss of life.
In the event of a single-phase fault, currents are generated whose vectors are directed to the zero point (there is no angle of displacement between the current phases). They pose a danger to both the equipment and the people working with it. To prevent emergencies, transformers of this type are installed at substations. The principle of operation of a zero-sequence current transformer is to detect in a timely manner if the normal sum of the three current phases is exceeded (which should be equal to zero in normal mode) and then to disconnect the network. It works as follows: an ammeter connected to the secondary winding of transformer equipment detects the appearance of zero-sequence currents, after which the switchgear disconnects the network, thereby preventing a short circuit. The equipment has various modifications. The models differ in various parameters, in particular, they have different degrees of resistance to climatic conditions, size and type of connection cable, protection sensitivity, type and scale of relay, etc. The price of the equipment varies depending on the parameters.
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On our website you can order a high-quality zero-sequence transformer with delivery to your city. We have the most popular models on sale, the characteristics of which can be found on the page of each product. All models presented on the site have a quality guarantee from the manufacturer. For all questions, including ordering equipment and arranging delivery, please contact our managers at the phone numbers listed in the Contacts section.
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