A Voltage Transformer (VT, or Potential transformer, PT) is a key device in power systems used for measurement, protection, and control. Its core function is to proportionally convert high voltage into a safe low voltage (typically 100V or 100/√ 3V). For secondary equipment use. The following is a comprehensive analysis from the aspects of structure, principle, application and technical key points:
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? I. Core definitions and functions
1. Essence and Function
A voltage transformer is a special type of transformer that operates based on the principle of electromagnetic induction, converting the high voltage on the primary side (such as 10kV to 500kV) into the standard low voltage on the secondary side (100V).
- Core Functions:
- Safety isolation: Isolate high voltage to protect the safety of measuring instruments and operators.
- Signal standardization: Provide standard voltage signals to make instruments and relay protection devices universal.
- System monitoring: Used for electric energy metering, voltage monitoring, synchronous detection and fault protection (such as zero-sequence voltage protection).
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