Product Description

grounding transformers are designed to provide an artificial neutral point for ungrounded three-phase power systems.

During a line ground fault, the grounding transformer provides an easy path for the ground fault, thereby limiting the fault current and transient overvoltage.

grounding transformer usually generates a short-circuit grounding current until the circuit breaker clears the fault. Therefore, their time is shorter.

grounding transformer depends on the normal line-to-neutral voltage and the fault current value for a specified time (e. g., seconds to minutes).

Wait a moment and use the Checklist below to gather the following (13) basic grounding transformer information:

1. winding configuration; sawtooth or two windings.
2. voltage and BIL; line-to-line value of the system to which the grounding transformer is to be connected. If a two-winding grounding transformer is required, a secondary voltage must also be provided.
3. continuous neutral current.
4. the neutral fault current and duration available to the system; for example, 500 amps for 10 seconds and 4000 amps for 2 seconds.
5. zero sequence impedance percentage.
6. Impedance in ohms per phase.
7. , in ohms.
8. X/R ratio; usually> 4.0.
9. special application conditions; I .e. 2000 MASL, etc.
10. enclosure construction or NEMA specified preferences; I .e. high security zoned top, standard ventilation or substation design, special paint colors, etc.
11. terminal connection preferences; I .e. dead front, living front, regular terminal, etc.
12. winding material; CU if not specified.
13. transformer temperature rise; if not specified, 150 ° c.