High Precision Current Transformer

Abstract

The invention relates to a high-precision current transformer. The high-precision current transformer includes a primary winding and several secondary windings. The primary winding and several secondary windings form several winding units, and each winding unit includes a secondary winding. , several secondary windings are connected in series or disconnected through a circuit breaker; the two ends of the primary winding are respectively connected to two main input terminals; Adding secondary windings connected in series will increase the turns ratio accordingly, so that the secondary current will be in a suitable range, and will not be too small, nor will it lead to full load. It is worth vigorously promoting.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to high-precision current transformers. Background technique [0002] Transformer, also known as instrument transformer, is a general term for current transformer and voltage transformer. It can change high voltage into low voltage and high current into small current for measurement or protection system. Its function is mainly to convert high voltage or high current into standard low voltage (100V) or standard small current (5A or 1A, both refer to rated value) in proportion, so as to realize the standardization and miniaturization of measuring instruments, protection equipment and automatic control equipment. change. At the same time, the transformer can also be used to isolate the high-voltage system to ensure the safety of people and equipment. [0003] Due to the large range of current variation, the secondary winding and primary winding are required to have a large turn...

AI Technical Summary

Problems solved by technology

[0003] Due to the large range of current variation, the secondary winding and primary winding are required to have a large turns ratio suitable for the current peak, but this will cause the secondary current to be reduced by a large factor when the current valley value or close to the valley value. The current value of the measurement terminal is small, resulting in low measurement accuracy. If a small turn ratio is set, although the measurement accuracy can be improved, the rated primary current cannot reach the current peak value, resulting in insufficient measurement range and full-load overheating.

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