SPDC Terms beginning with B

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.
back filter

A filter inserted in the power line feeding an equipment to be surge tested; this filter has a dual purpose: (1) of preventing the applied surge from being fed back to the power source where it might cause damage. (2) of eliminating loading effects of the power source on the surge generator.
[C62.41.1-2002]

back flashover

A flashover of insulation resulting from a lightning stroke to part of a network or electric installation that is normally at ground potential
[C62.23-1995]

back flashover (lightning)

A flashover of insulation resulting from a lightning stroke to part of a network or electric installation that is normally at ground potential.
[C62.41.1-2002]

back-up air gap devices

An air gap device connected in parallel with a sealed gas tube device, having a higher breakdown voltage than the gas tube, which provides a secondary means of protection in the event of a venting to atmosphere by the primary gas tube device.
[C62.31-2006]

balanced voltage limiting

The simultaneous or near simultaneous breakdown of two gas-tube surgeprotective device components in response to a longitudinal (common mode) voltage.
NOTE: The two gaps are usually combined in a single, three electrode gas-tube surge-protective device component.
[C62.31-2006]

basic lightning impulse insulation level (BIL)

The electrical strength of insulation expressed in terms of the crest value of a standard lightning impulse under standard atmospheric conditions. BIL may be expressed as either statistical or conventional.
[C62.82.1-2010]

basic lightning impulse insulation level (BIL)

(A) The electrical strength of insulation in terms of the crest value of a standard lightning impulse under standard atmospheric conditions. BIL may be expressed as either statistical or conventional.
(B) A specific insulation level expressed as the crest value of a standard lightning impulse. See also: conventional basic lightning impulse insulation level (BIL); statistical basic lightning impulse insulation level (BIL).
[C62.11-2005]

basic lightning impulse insulation level (BIL)

The electrical strength of insulation expressed in terms of the crest value of a standard lightning impulse under standard atmospheric conditions. BIL may be expressed as either statistical or conventional.
[C62.22-2009]

basic switching impulse insulation level (BSL)

The electrical strength of insulation expressed in terms of the crest value of a standard switching impulse. BSL may be expressed as either statistical or conventional.
[C62.82.1-2010]

basic switching impulse insulation level (BSL)

The electrical strength of insulation expressed in terms of the crest value of a standard switching impulse. BSL may be expressed as either statistical or conventional.
[C62.22-2009]

basic switching impulse insulation level (BSL)

(A) The electrical strength of insulation expressed in terms of the crest value of a standard switching impulse. BSL may be expressed as either statistical or conventional.
(B) A specific insulation level expressed as the crest value of a standard switching impulse. See also: conventional basic switching impulse insulation level (BSL); statistical basic switching impulse insulation level (BSL).
[C62.11-2005]

bidirectional thyristor

A thyristor having substantially the same switching behavior in the first and third quadrants of the principal voltage-current characteristic.
[62.37-1996]

blocking

A term describing the state of a semiconductor device or junction that imposes high resistance to the passage of current.
[62.37-1996]

blocking voltage

The maximum voltage that can be applied to current-limiting pairs of terminals of a surge protector containing one or more current-protective devices without degradation of the surge protector.
[C62.36-2000]

breakdown

A phenomena occurring in a reverse biased semiconductor junction, the initiation of which is observed as a transition from a region of high dynamic resistance to a region of substantially lower dynamic resistance for increasing magnitude of reverse current.
[62.37-1996]

breakdown

The abrupt transition of the gap resistance from a practically infinite value to a relatively low value. In the case of a gap, this is sometimes referred to as sparkover or ignition. See also: sparkover.
[C62.31-2006]

breakdown (clamping) region

The portion of the volt-ampere characteristic occurring in a reverse-biased P-N junction that starts with the transition from a region of high resistance to a region of substantially lower small-signal resistance for an increasing magnitude of current.
[C62.35-2010]

breakdown current

I(BR)
The current through the device in the breakdown region.
[62.37-1996]

breakdown region

The portion of the characteristic that starts with the transition from the high dynamic resistance off-state to a substantially lower dynamic resistance and extending to the switching point.
[62.37-1996]

breakdown voltage

V(BR)
The voltage across the device at a specified pulsed dc current in the avalanche region.
[C62.35-2010]

breakdown voltage

V(BR)
The voltage across the device in the breakdown region (prior to the switching point) at a specified breakdown current, I(BR).
[62.37-1996]

breakdown voltage, ac

The minimum rms value of a sinusoidal voltage at frequencies between 15 Hz and 62 Hz that results in gas-tube sparkover.
[C62.31-2006]

breakdown voltage, dc

The minimum dc voltage with a ramp rate (100 V/s to 2000 V/s) that will cause breakdown or sparkover when applied across the terminals of a gas tube.
[C62.31-2006]

breakover current

I(BO)
The instantaneous current flowing at the breakover voltage.
[62.37-1996]

breakover point

Any point on the principal voltage-current characteristic for which the differential resistance is zero and where the principal voltage reaches a maximum value.
NOTE: For a thyristor SPD, the breakover point occurs in the breakdown region. If more than one breakover point exists in the breakdown region, the one with the highest voltage value shall be characterized.
[62.37-1996]

breakover voltage

V(BO)
The maximum voltage across the device in or at the breakdown region measured under specified voltage rate of rise and current rate of rise.
[62.37-1996]