|
SPDC Terms A-B
AC STANDBY POWER (VARISTOR)
Varistor ac power dissipation measured at rated rms voltage Vm(ac).
[C62.33–1989]
ACCEPTANCE TEST
A test to demonstrate the degree of compliance of a device with purchaser's requirements.
[STD 32–1990]
AIR DISCHARGE METHOD
A method of ESD testing in which the charged electrode of the ESD simulator approaches the Unit Under Test (UUT) or coupling plane. The discharge is actuated by a spark in air to the UUT or coupling plane.
[C62.38–1995]
AIR GAP SURGE ARRESTER
A gap or gaps, in air at ambient atmospheric pressure, designed to protect apparatus and personnel or both, from high transient voltages.
[C62.32–1987]
AIR GAP SURGE PROTECTOR
A protective device, consisting of one or more air gap surge arresters; optional fuses, short-circuiting devices, etc; and a mounting assembly, for limiting surge voltages on low voltage (600 V rms or less) electrical and electronic equipment or circuits.
[C62.32–1987]
AIR INSULATION AND SWITCHGEAR
For air insulation and switchgear: 250 x 2500 µs.
[C62.2–1987]
AMBIENT TEMPERATURE
The temperature of the medium such as air, water, or earth into which the heat of the equipment is dissipated.
[STD 32–1990]
ANODE
The electrode by which current enters the thyristor, when the thyristor is in the on-state with the gate open-circuited.
[C62.37–1996 & STD. 100-2000]
ANTISTATIC
A property of materials that resist triboelectric charging.
[C62.47–1992]
APPROACH SPEED
The rate at which the intruder approaches the receptor.
[C62.47–1992]
ARC CURRENT
The current that flows after breakdown when the circuit impedance allows a current that exceeds the glow-to-arc transition current. Sometimes called arc mode current.
[C62.31–1987]
ARC VOLTAGE
The voltage drop across the arrester during arc current flow. Sometimes called arc mode voltage.
[C62.31–1987]
ARRESTER DISCHARGE CURRENT
The current that flows through an arrester due to a surge.
[C62.22–1991]
The surge current that passes through an arrester when sparkover occurs.
[C62.2–1987]
ARRESTER DISCHARGE VOLTAGE
The voltage that appears across the terminals of an arrester during passage of discharge current.
[C62.22–1991]
The voltage that appears across the terminals of an arrester during passage of discharge current. Published discharge voltages are determined by tests using 8/20µs impulses.
[C62.2–1987]
ARRESTER DISCONNECTOR
A means for disconnecting an arrester in anticipation of or after, a failure in order to prevent a permanent fault on the circuit and to give indication of a failed arrester.
NOTE: Clearing of the power current through the arrester during disconnection generally is a function of the nearest source-side overcurrent-protective device.
[C62.1–1989 & C62.11–1987]
ARRESTER DUTY CYCLE RATING
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 perform it's duty cycle.
[C62.22–1991]
ARRESTER RATING (FOR SILICON CARBIDE ARRESTERS ONLY)
The designated maximum permissible operating voltage between an arrester's terminals at which it is designed to perform it's duty cycle. It is the voltage rating specified on the nameplate.
[C62.1–1984, C62.2–1987]
ARRESTER RECOVERY VOLTAGE
The crest voltage that occurs across the terminals of an arrester following a unit operation.
[C62.2–1987]
ARRESTER SPARKOVER
A disruptive discharge between electrodes of an arrester.
[C62.2–1987]
ARRESTER UNIT
Any section of a multi-unit arrester.
[C62.11–1993]
ARRESTER, DEADFRONT TYPE
An arrester assembled in a shielded housing providing system insulation and conductive ground shield, intended to be installed in an enclosure for the protection of underground and pad-mounted distribution equipment and circuits.
[C62.11–1993]
ARRESTER, DISTRIBUTION, HEAVY DUTY CLASS
An arrester normally used to protect overhead distribution systems exposed to severe lightning currents.
[C62.11–1993]
ARRESTER, DISTRIBUTION, LIGHT DUTY CLASS
An arrester normally installed on and used to protect underground distribution systems where the major portion of the lightning stroke current is discharged by an arrester located at the overhead line/cable junction.
[C62.11–1993]
ARRESTER, DISTRIBUTION, NORMAL DUTY CLASS
An arrester normally used to protect overhead distribution systems exposed to normal lightning currents.
[C62.11–1993]
ARRESTER, RISER POLE TYPE
An arrester for pole mounting normally used to protect underground distribution cable and equipment.
[C62.11–1993]
BACK FILTER
A filter inserted in the power line feeding an equipment to be surge tested; this filter has a dual purpose: (1) To prevent the applied surge from being fed back to the power source where it may (might according to the word usage in this guide) cause damage. (2) To eliminate loading effects of the power source on the surge generator. See decoupling network.
[C62.45–1992]
BACKUP AIR-GAP DEVICE
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.
[C62.31–1987 & C62.32–1987]
BASIC IMPULSE INSULATION LEVEL (BIL)
A reference impulse insulation strength expressed in terms of the crest value of withstand voltage of standard full impulse voltage wave.
NOTE: See ANSI C92.1–1982
[C62.1–1989 & C62.11–1987]
BASIC LIGHTNING IMPULSE INSULATION LEVEL
The electrical strength of insulation expressed in terms of the crest value of a standard lightning impulse. The basic lightning impulse insulation level (BIL) may be either a STATISTICAL BIL, or a CONVENTIONAL BIL (see ANSI C92.1–1982)
[C62.2–1987]
A specific insulation level expressed in terms of the crest value of a standard lightning impulse; see ANSI C92.1–1982.
[C62.22–1991]
BASIC SWITCHING IMPULSE INSULATION LEVEL
The electrical strength of insulation expressed in terms of the crest value of a standard switching impulse. The basic switching impulse insulation level (BSL) may be either a STATISTICAL BSL, or a CONVENTIONAL BSL (see ANSI C92.2–1982)
[C62.2–1987]
A specific insulation level expressed in terms of the crest value of a standard switching impulse; see ANSI C92.1–1982
[C62.22–1991]
BIDIRECTIONAL THYRISTOR
A thyristor having substantially the same switching behavior in the first and third quadrants of the principal
voltage-current characteristic.
[C62.37–1996]
BLIND SPOT
A limited range within the total domain of application of a device, generally at values inferior to the maximum rating. Operation of the equipment or of the protective device might fail in that limited range despite the device's demonstration of satisfactory performance at maximum ratings.
[C62.45–1992]
BLOCKING
A term describing the state of a semiconductor device or junction that imposes high resistance to the passage of current.
[C62.37–1996]
BODY/FINGER ESD
An electrostatic discharge from an intruding human finger or hand. Also called body /finger discharge.
[C62.47–1992]
BODY/METAL ESD
See hand/metal ESD. Also called body/metal discharge.
[C62.47–1992]
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.
[C62.37–1996]
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: sparkover.
[C62.31–1987 & C62.32–1987]
BREAKDOWN CURRENT
(I(BR))
The current through the device in the breakdown region.
[C62.37–1996]
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.
[C62.3 7–1996]
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).
[C62. 37–1996]
BREAKDOWN VOLTAGE, ac
The minimum rms value of a sinusoidal voltage at frequencies between 15 Hz and 62 Hz that results in arrester sparkover.
[C62.31–1987]
BREAKDOWN VOLTAGE, dc
The minimum slowly rising do voltage that causes breakdown or sparkover when applied across the terminals of an arrester.
[C62.31–1987 & C62.32–1987]
BREAKOVER CURRENT
(I(BO))
The instantaneous current flowing at the breakover voltage, V(BO)
[C62.37–1996]
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.
[C62.37–1996 & STD. 100-2000]
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.
[C62.37–1996]
BRUSH-BY
An electrostatic discharge from the human torso, such as from the hip or shoulder. Also called brush-by ESD or brush-by discharge.
[C62.47–1992]
|
