SPDC Terms beginning with R

Terms and definitions extracted from current SPDC published documents
Click one of the capital letters above to advance the page to terms beginning with that letter.
radio-influence voltage (RIV)

A high-frequency voltage, generated by all sources of ionization current, that appears at the terminals of electric-power apparatus or on power circuits.
[C62.11-2005]

rated average power dissipation

PM(AV)
Maximum average power dissipation in the device due to repetitive pulses at a specified current and temperature without causing device failure.
[C62.35-2010]

rated dc voltage (Varistor)

Vm(dc)
Maximum continuous dc voltage which may be applied.
[C62.33-1982]

rated forward surge current

IFSM
Maximum peak current of specified wave shape through the unidirectional device during its forward conduction mode without causing device failure.
[C62.35-2010]

rated peak impulse current

IPPM
Rated maximum value of peak impulse current (IPP) of specified wave shape that may be applied without causing device failure.
[C62.35-2010]

rated peak impulse power

PPPM
Product of rated peak impulse current (IPPM) and clamping voltage (VC): PPPM = IPPM x VC.
NOTE 1—For this calculation the value of VC is measured with IPP equal to IPPM.
NOTE 2—PPPM is a fictive value as the peak values of current and voltage do not occur at the same time.
[C62.35-2010]

rated peak single pulse transient current (Varistor)

Itm
Maximum peak current which may be applied for a single 8/20 µs impulse, with rated line voltage also applied, without causing device failure.
[C62.33-1982]

rated peak single-pulse transient current

Maximum peak current that may be applied for a single 8/20 µs impulse, with rated line voltage also applied, without causing device failure.
[C62.41.1-2002]

rated recurrent peak voltage (Varistor)

Vpm
Maximum recurrent peak voltage which may be applied for a specified duty cycle and waveform.
[C62.33-1982]

rated RMS Voltage (Varistor)

V m(ac)
Maximum continuous sinusoidal rms voltage which may be applied.
[C62.33-1982]

rated single pulse transient energy (Varistor)

Wtm
Energy which may be dissipated for a single impulse of maximum rated current at a specified waveshape, with rated rms voltage or rated dc voltage also applied, without causing device failure.
[C62.33-1982]

rated single-pulse transient energy

Energy that may be dissipated for a single impulse of maximum rated current at a specified wave shape, with rated root?mean?square (rms) voltage or rated dc voltage also applied, without causing device failure.
[C62.41.1-2002]

rated standby power dissipation

The power dissipated in a protective device while connected to an ac line having a voltage and frequency equal to the rating of the device and with no load current flowing and no surges applied.
[C62.41.1-2002]

rated standoff (working) voltage

VWM
Maximum peak working or DC voltage which may be continuously applied to the device.
[C62.35-2010]

rated test voltage (rotating electric machinery)

The rms fundamental frequency test voltage specified for the rated voltage, V, of the machine in the standard under which the machine is manufactured.
[C62.21-2003]

rated transient average power dissipation (Varistor)

Pt(AV)m
Maximum average power which may be dissipated due to a group of pulses occurring within a specified isolated time period, without causing device failure.
[C62.33-1982]

rated voltage

The designated maximum permissible root?mean-square (rms) value of power-frequency voltage between its line and earth terminals at which it is designed to operate correctly.
[C62.41.1-2002]

rated voltage (rotating electric machinery)

The rms voltage specified at the terminals of a machine, V.
[C62.21-2003]

rating

The designation of an operating limit for a device.
[C62.41.1-2002]

rating

The designation of an operating limit for a device.
[C62.11-2005]

rating

The nominal value of any electrical, thermal, mechanical, or environmental quantity assigned to define the operating conditions under which a component, machine, apparatus, electronic device, etc., is expected to give satisfactory service.
NOTE: Rating is a generic term, but also see maximum rating.
[62.37-1996]

recovery voltage

The voltage that occurs across the terminals of a pole of a circuit?interrupting device upon interruption of the current.
NOTE: For an arrester, this occurs as a result of interruption of the follow current.
[C62.41.1-2002]

reference current

Iref
The peak value of the resistive component of a power-frequency current high enough to make the effects of stray capacitance of the arrester negligible. This current level shall be specified by the manufacturer.
NOTE: Depending on the arrester design, the reference current will typically be in the range of 0.05 mA to 1.0 mA per square centimeter of disk area.
[C62.11-2005]

reference voltage

Vref
The lowest peak value independent of polarity of power-frequency voltage, divided by the square root of 2, required to produce a resistive component of current equal to the reference current of the arrester or arrester element. The reference voltage of a multi-unit arrester is the sum of the reference voltages of the series units. The voltage level shall be specified by the manufacturer.
[C62.11-2005]

reignition

A resumption of current between the contacts of a switching device during an opening operation after an interval of zero current of less than 1/4 cycle at normal frequency.
[C62.21-2003]

remote earth (potential)

The location outside the influence of local grounds. Always assumed to be at zero potential.
[C62.23-1995]

remote surge (rotating electric machinery)

A surge that originates at least one voltage transformation removed from the machine.
[C62.21-2003]

repetitive peak forward current

IFRM
Rated maximum (peak) value of ac power frequency forward current of specified wave shape and frequency which may be applied continuously.
[62.37-1996]

repetitive peak off-state current

IDRM
The maximum (peak) value of off-state current that results from the application of the repetitive peak off-state voltage.
[62.37-1996]

repetitive peak off-state voltage

VDRM
Rated maximum (peak) continuous voltage that may be applied in the off-state conditions including all dc and repetitive alternating voltage components.
[62.37-1996]

repetitive peak on-state current

ITRM
Rated maximum (peak) value of ac power frequency on-state current of specified wave shape and frequency which may be applied continuously.
[62.37-1996]

repetitive peak reverse current

IRRM
The maximum (peak) value of reverse current that results from the application of the repetitive peak reverse voltage, VRRM.
[62.37-1996]

repetitive peak reverse voltage

VRRM
Rated maximum (peak) continuous voltage that may be applied in the reverse blocking direction including all dc and repetitive alternating voltage components.
[62.37-1996]

repetitive rating

A maximum rating that may be continuously applied to the thyristor.
[62.37-1996]

repetitive surge and follow-current withstand

The number of surges of specified voltage and current amplitudes and wave shapes that may be applied to a device without causing degradation beyond specified limits. The repetitive surge and follow?current withstand applies to a device connected to an ac line of specified characteristics and for pulses applied at specified rates and phase angles. The effects of any cumulative heating that may occur are included.
[C62.41.1-2002]

resistance (Varistor)

Rx
Static resistance of the varistor at a given operating point as defined by:
Rx = dVx/dIx
[C62.33-1982]

resonant grounded neutral system

A system in which one or more neutral points are connected to ground through reactors that approximately compensate the capacitive component of a single-phase-to-ground-fault current.
NOTE — With resonant grounding of a system, the fault current is limited such that an arc fault in air will be self-extinguishing.
[C62.82.1-2010]

response time (Varistor)

The time between the point at which the wave exceeds the clamping voltage level (VC) and the peak of the voltage overshoot. For the purpose of this definition, clamping voltage is defined with a 8/20 µs current waveform of the same peak current amplitude as the waveform used for this response time.
[C62.33-1982]

restrike

A resumption of current between the contacts of a switching device during an opening operation after an interval of zero current at 1/4 cycle at normal frequency or longer.
[C62.21-2003]

reverse direction

1) The direction of current in a p-n junction that results when the n-type semiconductor region is at a positive potential relative to the p-type region.
2) The direction of current in a semiconductor device that results when the n-type semiconductor region connected to one terminal is at a positive potential relative to the p-type region connected to the other terminal.
NOTE: This definition may not apply if one or more junctions are connected in series with at least one other junction whose p and n regions are reversed.
[62.37-1996]

reverse-blocking diode thyristor surge protection device (SPD)

A two-terminal thyristor SPD that exhibits a blocking state for positive cathode voltage.
[62.37-1996]

reverse-blocking quadrant

Quadrant 3 of the principal voltage-current characteristic in which the device exhibits a reverse blocking state.
[62.37-1996]

reverse-blocking triode thyristor surge protection device (SPD)

A three-terminal thyristor SPD that exhibits a blocking state for positive cathode voltage.
[62.37-1996]

ring wave

An open-circuit voltage wave characterized by a rapid rise to a defined peak value, followed by a damped oscillation in which every successive peak has an amplitude of about 60% of the value of the peak that preceded it. For the 100 kHz Ring Wave, the rise time is nominally 0.5 µs and the ringing frequency is approximately 100 kHz. No short-circuit current waveform is defined; the exact wave that is delivered is determined by the instantaneous impedance to which the Ring Wave is applied.
[C62.41.1-2002]

riser pole type arrester

An arrester for pole mounting most often used to protect underground distribution cable and equipment.
[C62.22-2009]

routine tests

Tests made by the manufacturer on every device or representative samples, or on parts or materials, as required, to verify that the product meets the design specifications.
[C62.41.1-2002]

routine tests

Tests made by the manufacturer on every device or on representative samples, or on parts or materials as required to verify that the product meets the design specifications.
[C62.34-1996]

routine tests

Tests made by the manufacturer on every device or representative samples, or on parts or materials, as required, to verify that the product meets the design specifications.
[C62.11-2005]