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Edgar Brown
Edgar Brown
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  • Use a relay with higher voltage tolerance. You are cutting it too close with your specifications.
  • Add a 1uF 400V capacitor to your secondary (perhaps in series with a small <100Ω resistor to attenuate resonances). This should introduce a load current in the secondary, while not consuming any real power beyond the induced secondary and core transformer losses.

Do note that a capacitive load introduces a leading power factor, under the wrong conditions this could actually increase the voltage of the transformer. A purely inductive load would clearly work better, but it would not be practical for this application (>10H would be required).

  • Use a relay with higher voltage tolerance. You are cutting it too close with your specifications.
  • Add a 1uF 400V capacitor to your secondary (perhaps in series with a small <100Ω resistor to attenuate resonances). This should introduce a load current in the secondary, while not consuming any real power beyond the induced secondary and core transformer losses.

Do note that a capacitive load introduces a leading power factor, under the wrong conditions this could actually increase the voltage of the transformer.

  • Use a relay with higher voltage tolerance. You are cutting it too close with your specifications.
  • Add a 1uF 400V capacitor to your secondary (perhaps in series with a small <100Ω resistor to attenuate resonances). This should introduce a load current in the secondary, while not consuming any real power beyond the induced secondary and core transformer losses.

Do note that a capacitive load introduces a leading power factor, under the wrong conditions this could actually increase the voltage of the transformer. A purely inductive load would clearly work better, but it would not be practical for this application (>10H would be required).

added 157 characters in body
Source Link
Edgar Brown
Edgar Brown
  • 8.5k
  • 2
  • 20
  • 55
  • Use a relay with higher voltage tolerance. You are cutting it too close with your specifications.
  • Add a 1uF 400V capacitor to your secondary (perhaps in series with a small <100Ω resistor to attenuate resonances). This should introduce a load current in the secondary, while not consuming any real power beyond the induced secondary and core transformer losses.

Do note that a capacitive load introduces a leading power factor, under the wrong conditions this could actually increase the voltage of the transformer.

  • Use a relay with higher voltage tolerance. You are cutting it too close with your specifications.
  • Add a 1uF 400V capacitor to your secondary (perhaps in series with a small <100Ω resistor to attenuate resonances). This should introduce a load current in the secondary, while not consuming any real power beyond the induced secondary and core transformer losses.
  • Use a relay with higher voltage tolerance. You are cutting it too close with your specifications.
  • Add a 1uF 400V capacitor to your secondary (perhaps in series with a small <100Ω resistor to attenuate resonances). This should introduce a load current in the secondary, while not consuming any real power beyond the induced secondary and core transformer losses.

Do note that a capacitive load introduces a leading power factor, under the wrong conditions this could actually increase the voltage of the transformer.

Source Link
Edgar Brown
Edgar Brown
  • 8.5k
  • 2
  • 20
  • 55

  • Use a relay with higher voltage tolerance. You are cutting it too close with your specifications.
  • Add a 1uF 400V capacitor to your secondary (perhaps in series with a small <100Ω resistor to attenuate resonances). This should introduce a load current in the secondary, while not consuming any real power beyond the induced secondary and core transformer losses.