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Three Phase + N Voltage Monitoring Relay combined with NO or NC power relay?
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<blockquote data-quote="kakrakas" data-source="post: 554272" data-attributes="member: 37872"><p>I would like your opinion on an issue that concerns me. I recently purchased a Carlo Gavazzi three-phase voltage monitor (overvoltage, undervoltage, phase sequence and Neutral loss), and I am a bit on a dilemma about which relay option is the right one to use. Should I use a relay with Normally Open (NO) contacts, operating continuously 24 hours a day, or should I use a relay with Normally Closed (NC) contacts, activating only when the voltage monitor detects a fault and keeping the installation disconnected? This will be installed to my house's main consumer unit.</p><p></p><p>I was considering the second option for prolonging the relay's lifespan and to have an almost zero energy consumption during normal operation since the relay's coil won't be continuously active. Additionally, this setup would potentially minimize the load on the output contacts of the voltage monitor. However, I am concerned about the reliability of this configuration. While most of the fault scenarios such as wrong phase sequence, over/undervoltage should be covered by both configurations, I'm not sure what would happen in the event of a loss of Neutral...Most likely, the relay's coil will only receive Line and with no Neutral it won't be able to energize the relay to disconnect the installation from the fault! </p><p></p><p>Your insights would be greatly appreciated.</p></blockquote><p></p>
[QUOTE="kakrakas, post: 554272, member: 37872"] I would like your opinion on an issue that concerns me. I recently purchased a Carlo Gavazzi three-phase voltage monitor (overvoltage, undervoltage, phase sequence and Neutral loss), and I am a bit on a dilemma about which relay option is the right one to use. Should I use a relay with Normally Open (NO) contacts, operating continuously 24 hours a day, or should I use a relay with Normally Closed (NC) contacts, activating only when the voltage monitor detects a fault and keeping the installation disconnected? This will be installed to my house's main consumer unit. I was considering the second option for prolonging the relay's lifespan and to have an almost zero energy consumption during normal operation since the relay's coil won't be continuously active. Additionally, this setup would potentially minimize the load on the output contacts of the voltage monitor. However, I am concerned about the reliability of this configuration. While most of the fault scenarios such as wrong phase sequence, over/undervoltage should be covered by both configurations, I'm not sure what would happen in the event of a loss of Neutral...Most likely, the relay's coil will only receive Line and with no Neutral it won't be able to energize the relay to disconnect the installation from the fault! Your insights would be greatly appreciated. [/QUOTE]
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Three Phase + N Voltage Monitoring Relay combined with NO or NC power relay?
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