BH0.66CT is a type of current transformer, and the following are its common parameters:
- Rated voltage: 0.66kV, indicating that this transformer is suitable for power systems with a line voltage of 660V and below.
- Rated frequency: Generally 50Hz or 60Hz, which is the power frequency for the normal operation of the transformer.
- Rated primary current: There are various specifications, such as 5A, 10A, 15A, 20A, 30A, 40A, 50A, 75A, 100A, 150A, 200A, 300A, 400A, 500A, 600A, 800A, 1000A, etc. Different primary current specifications are selected according to actual measurement requirements.
- Rated secondary current: Usually 5A or 1A. The secondary current is the output current connected to measuring instruments, protective devices, etc., which is convenient for subsequent devices to conduct measurements and protective actions.
- Accuracy class: Common ones include class 0.2, class 0.5, class 1, class 3, etc. The accuracy class represents the measurement accuracy of the transformer. For example, class 0.5 means that at the rated current, the measurement error of the transformer does not exceed ±0.5%.
- Number of turns through the core: It refers to the number of turns of the primary wire passing through the central hole of the transformer. Changing the number of turns through the core can change the transformation ratio of the transformer. For example, when the number of turns through the core is 1, the transformation ratio is 100/5; when the number of turns through the core becomes 2, the transformation ratio becomes 50/5.
- Insulation resistance: The insulation resistance of the transformer should meet certain requirements. Generally, it will be tested during factory production to ensure its good insulation performance and prevent faults such as electric leakage and short circuits.
- Withstand voltage level: It can withstand the specified power frequency withstand voltage test voltage. For example, the power frequency withstand voltage between the primary winding and the secondary winding and the ground is 3kV or 5kV, etc., and the duration is usually 1 minute to test the insulation strength of the transformer.
The specific parameters of BH0.66CT current transformers produced by different manufacturers will have some differences. When actually using them, selection and installation should be carried out according to the product instruction manual and actual requirements.
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