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Principles and applications of photoelectric current transformers
Source: China Transformer Network Time: 2008-05-30 Font : [Large, Medium, Small] Contribution
Photoelectric current transformer
High-voltage current transformer is a power system that transforms and transmits high-voltage signals in the power grid into low-voltage and small current signals, thereby providing the system with Measurement, monitoring, relay protection, automatic devices and other devices that provide unified and standardized current signals (traditional analog, modern digital); important equipment that also meets electrical isolation and ensures personal and electrical safety.
High-voltage current transformers can be divided into electromagnetic current transformers and electronic current transformers according to their principles. Electronic current transformers can be divided into active type and passive magneto-optical glass type according to the working mode of primary sensor.
1 Electromagnetic current transformer
Electromagnetic current transformer is a transformer that realizes current conversion through the principle of electromagnetic induction.
Because it has been widely used in power systems. Now we only analyze the main saturation issues.
There are two main types of common current transformer saturation: steady-state saturation and transient saturation. Steady-state saturation is mainly due to the primary current value being too large and entering the saturation region of the current transformer, resulting in the secondary current not being able to correctly transmit the primary current. Transient saturation is caused by the existence of a large number of non-periodic components entering the saturation region of the current transformer.
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