Replace the load with a resistor, turn off the power, record the decay on a
storage scope and compute the RC time constant.
Richard Woods
----------
From: Brian Kunde at LECO [SMTP:[email protected]]
Sent: Wednesday, November 17, 1999 4:00 PM
To: IEEE Group
Subject: Measuring Capacitance in HV circuits
Hello Group,
In EN61010, section 6.3 says, "If the voltage exceeds the value
listed in 6.3.1 or 6.3.2, the current and capacitance shall be measured."
I understand how to measure current (6.3.1.2) with the circuit in
Annex A, but how do I measure Capacitance for section 6.3.1.3? It doesn't
seem right to try and measure a complex circuit while powered off with a
conventional capacitance meter. How else can this be done?
Any help would be appreciated.
Brian Kunde
MORE INFORMATION
I have an instrument that places 2500 volts in an area that the
operator has to have access to. We are attempting to verify that this
circuit meets the requirements of a limited current circuit by applying the
requirements of section 6.3.. When applying the loading circuit described in
Annex A the voltage is loaded down to a point where the HV circuit shuts
down. To my understanding, doing so meets the requirements of 6.3.1.2..
But, when you first apply the loading circuit to the HV circuit you see a
small arc or spark, so I'm assuming there is some discharged energy that
exists before the HV Circuit shuts off.
I assume this issue would be covered under the Capacitance
measurement in section 6.3.1.3 but I have no idea how to make this
measurement.
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