B2 HVA34 - Glossary and Abbreviations; Glossary of Terms and Abbreviations

10
Glossary and Abbreviations
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DHV0078 b2 EN
61
10 Glossary and Abbreviations
The following explains abbreviations and selected terms used in this document
in alphabetical order.
Term
Explanation
Arc Self-maintained gas conduction for which most of the charge carriers are
electrons supplied by primary‑electron emission (source: IEC)
Auto Adjust
Frequency
“0.1 Hz/Auto”
Mode that maximizes output frequency to highest allowable value
• Greatest allowable frequency depends on the test load and test voltage
applied
• For loads greater than 1µF, the instrument automatically reduces the
frequency
DUT Device under test
Duty (continuous) Load state in which the relay remains energized for a period long enough to
reach thermal equilibrium
Fault An unplanned occurrence or defect in an item which may result in one or more
failures of the item itself or of other associated equipment (source: IEC)
Frequency [Hz] Number of cycles per unit of time: f = 1/period (time), units = Hz
1 Hz = 1cycle/1 second
0.1 Hz = 1cycle/10 seconds, etc.
Hipot High potential (voltage)
HV
High Voltage (tension)
• Extremely high voltage: typically 220 kV or 380 kV
• High voltage: typically 110 kV
IEC International Electrotechnical Commission
Peak value Maximum voltage = V
max
RMS value Root mean square voltage
• V
rms
= V
max
/ √2
To short Forcing the electric potential differences between two or more conductive
parts to be equal to or close to zero
(Infinite current flows in a short circuit)
To trip Opening the circuit
(no current flows in open circuit)
VLF Very low frequency
• Typically between 0.01-0.1 Hz
Vmax
V
rms
V
time