Voltage transformer core
Release Time:
2025-08-01
The iron core of a voltage transformer must be reliably grounded—this is a fundamental requirement of power system safety standards, aimed at preventing the core from becoming energized and posing a hazard in case of insulation failure.
The iron core of a voltage transformer must be reliably grounded—this is a fundamental requirement of power system safety standards, designed to prevent the core from becoming energized and posing a hazard in case of insulation failure.
The Necessity of Grounding the Iron Core
Safety Protection: Grounding the iron core eliminates potential differences caused by electrostatic induction, preventing the core from becoming energized in case of insulation failure and thereby safeguarding both equipment and personnel.
**Stable Potential:** By employing single-point grounding (typically using a single silicon steel sheet for grounding), the iron core is maintained at zero potential, preventing circulating currents caused by multi-point grounding, which could lead to overheating.
Other parts that must be grounded
In addition to the iron core, the parts of the voltage transformer that also need to be grounded include:
Metal casing: Prevents the casing from becoming energized in case of insulation failure.
On the secondary side: A protective circuit is formed, ensuring that current can be reliably discharged should high voltage from the primary side inadvertently enter the secondary side.
Grounding Code Requirements
Reliable grounding: The grounding resistance must meet standards to ensure effective current discharge to earth in case of abnormalities.
Single-point grounding: The secondary circuit is allowed to have only one grounding point, preventing multiple groundings that could cause circulating currents or interference.
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