[Voltage Transformer] The meaning of voltage transformer model The role of voltage transformer
The meaning of voltage transformer model
The model number of the voltage transformer consists of 3 to 4 pinyin letters and numbers. Usually it indicates the coil type, insulation type, core structure and usage location of the voltage transformer. The number after the letter indicates the voltage level (unit: KV). The meanings of the letters are as follows:
J: In the first digit, it represents voltage transformer; in the third digit, it represents oil-immersed type; in the fourth digit, it represents grounding protection;
S: In the second position, it means three-phase;
D: In the second position, it means single-phase;
G: In the third position, it means dry type;
Z: In the third position, it means cast type;
W: In the fourth position, it means five-iron core column type;
B: In the fourth position, It means there is a compensation coil;
C: When it is in the second position, it means series insulation; when it is in the third position, it means porcelain insulation.
For example: JDJJ-35 model voltage transformer represents a single-phase oil-immersed voltage transformer for grounding protection, with a voltage level of 35KV.
The function of voltage transformer
The function of voltage transformer is to convert high voltage into standard secondary voltage of 100V or lower in proportion. Voltage for use in protection, metering and instrumentation devices. At the same time, the use of voltage transformers can isolate high voltages from electrical workers. Although voltage transformer is also a device that works according to the principle of electromagnetic induction, its electromagnetic structural relationship is exactly opposite to that of current transformer. The secondary circuit of the voltage transformer is a high impedance circuit, and the size of the secondary current is determined by the impedance of the circuit. When the secondary load impedance decreases, the secondary current increases, causing the primary current to automatically increase by a component to satisfy the electromagnetic balance relationship between the primary and secondary sides. It can be said that the voltage transformer is a special transformer with a limited structure and use form. Simply put, it is a “detection element”.
If the website content violates your rights, please contact us to delete it。
