Hv Current Transformer

High currents are transformed using a current transformer ct down to typically 1 or 5 a and high voltages are transformed using a voltage transformer vt otherwise known as a potential transformer pt down to typically 100 or 110 v. Excellence in lv hv transformer efficiency to produce a more efficient lv or 11kv transformer powerstar had to first identify a material to replace the traditionally used crgo. They provide accurate and reliable current and voltage measurements for secondary equipment such as meters protections relays bay computers and other devices.

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Hv current transformer. By beijing nobbel electric tech develop co ltd. Current transformers inductive voltage transformers capacitive voltage transformers combined current voltage transformers and station service voltage transformers are designed to transform high current and high voltage levels down to low current and low voltage outputs in a known and accurate proportion specified by the product nameplate ratios. Bus bar type current transformer used together with transformer bushing circuit breaker outlet bushing switchgear bushing and bus bar for supplying measuring signal and protective signal of current. High voltage current transformers are mounted on porcelain or polymer insulators to isolate them from ground.

Live video ct testing 6. Common specifications for hv switchgear. The devices transform high current to a measurable value of 1 a or 5 a. Hv instrument current transformers in transmission and distribution systems on photo.

Current transformers hv. Instrument transformers are an essential link for the safe and efficient operation of transmission networks. Type ct and type iosk cts are of live tank type with rated voltage of 72 5 to 800 kv. Epro standard current transformers are used in transformer test fields instrument transformer test fields national metrological institutes and many more fields.

Go to content 4. Ge has manufactured tens of thousands high voltage instrument transformers. High voltage or high current is connected to the primary circuit of the instrument transformer and the measuring device is connected to the secondary circuit. The current transformer c t.

This is particularly true when you compare the current deployed ageing crgo transformers which may have been in place for over 30 years to contemporary equivalents. Is a type of instrument transformer that is designed to produce an alternating current in its secondary winding which is proportional to the current being measured in its primary current transformers reduce high voltage currents to a much lower value and provide a convenient way of safely monitoring the actual electrical current flowing in an ac. A large number of cg current transformers upto 550 kv have been put into service in various environments in over 60 countries since 1984 where they are operating satisfactorily. After commissioning secondary current measurement shall be carried out in ct circuits.

Phase angle check shall be done for correct direction. These devices are purely inductive and have been proven in the industry for decades. Go to content 5. Current transformers are used extensively for measuring current and monitoring the operation of the power grid along with voltage leads revenue grade cts drive the electrical utility s watt hour meter on many larger commercial and industrial supplies.