The voltage transformer model consists of the following parts, each part represented by letters and symbols:

The first letter: J - Voltage Transformer;

Second letter: D - single-phase; S - Three phase

The third letter: J - oil immersed; Z - pouring;

Fourth letter: Number - Voltage level (KV).

For example, JDJ-10 represents a single-phase oil immersed voltage transformer with a rated voltage of 10KV.

Rated primary voltage, the primary voltage value used as the performance benchmark for transformers.

Rated secondary voltage, the secondary voltage value used as the performance benchmark for transformers. Rated transformation ratio, the ratio of rated primary voltage to rated secondary voltage.

Accuracy level, determined by the transformer system, whose error should be within the specified limit under specified usage conditions. The impedance of the secondary circuit is usually expressed in apparent power (VA). Rated load, the load value that can be used to determine the accuracy level of the transformer.