IMD (Insulation Monitoring Device) and power relay have different purposes and functions.
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IMD insulation monitoring device
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Function : IMD monitors the insulation status in electrical equipment or circuits in real time, detects insulation degradation or leakage current, and provides a warning.
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Main purpose : To maintain the safety of the equipment and prevent electrical accidents that may occur due to poor insulation.
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Application : Primarily used in IT systems (isolated neutral systems). This is typically useful in sensitive environments such as medical equipment or data centers.
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Measurement target : insulation resistance and leakage current.
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How it works : Detect and respond to problems proactively with continuous insulation resistance testing.
Power Relay
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Function : Relays perform protection and control in power systems. They detect various power abnormalities such as overcurrent, overvoltage, and short-circuit faults and execute specific protective actions (e.g. circuit breaker operation).
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Primary purpose : Maintain the stability and reliability of the power system and prevent accidents from spreading.
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Usage Environment : Used in various power system environments such as power plants, substations, and industrial facilities.
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Measurement target : Power-related signals such as current, voltage, and frequency.
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How it works : It operates based on preset conditions (e.g. current limit exceeded) and protects the power grid.
Differences
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Purpose : IMD monitors insulation status and focuses on maintaining safety, while relays are primarily intended for power system protection and control.
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Operating Environment : IMDs are used in special environments such as IT systems, while relays are utilized in a wide range of power systems.
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Measurement Object : IMD analyzes insulation resistance, relay analyzes various signals of power system.
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The installation and operation methods are different.
The two devices support the stability and safety of the power system through different roles.