IEEE C62.1:1989 pdf download.IEEE Standard for Gapped Silicon-Carbide Surge Arresters for AC Power Circuits.
IEEE C62.1 applies to gapped silicon-carbide surge-protective devices designed for repeated limiting of voltage surges on 50 Hz or 60 Hz power circuits by passing surge discharge current and subsequently automatically interrupting the flow of follow current. This standard applies to devices for separate mounting and to those supplied integrally with other equipment.
2. Definitions
The following definitions apply specifically to surge arresters and do not necessarily cover other applications.
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 overcurre nt-protective device.
basic impulse insulation level (BIL): A reference impulse insulation strength expressed in terms of the crest value of withstand voltage of a standard full impulse voltage wave.
NOTE — See ANSI C92.1-l982 [3]
certification tests: Tests made, when required, to verify selected performance characteristics of a product or representative samples thereof.
classification of arresters: Arrester classification is determined by prescribed test requirements. These classifications are:
station arrester
intermediate arrester distribution arrester
secondary arrester
NOTES:
1 — Coefficients of grounding for three-phase systems are calculated from the phase-sequence impedance components as viewed from the selected location. For machines, use the subtransient reactance.
2 — The coefficient of grounding is useful in the determination of an arrester rating for a selected location.
3 — A value not exceeding 80% is obtained approximately when, for all system conditions, the ratio of zero-sequence reactance to positive-sequence reactance is positive and less than 3, and the ratio of zero-sequence resistance to positive sequence reactance is positive and less than I.
conformance tests: Tests made, when required, to demonstrate selected performance characteristics of a product or representative samples thereof.
crest (peak) value (of a wave, surge, or impulse): The maximum value that it attains.
deflector: A means for directing the flow of the gas discharge from the vent of the arrester.
design tests: Tests made by the manufacturer on each design to establish the performance characteristics and to demonstrate compliance with the appropriate standards of the industry. Once made, they need not he repeated unless the design is changed so as to modify performance.
discharge counter: A means for recording the number of arrester discharge operations.
discharge current: The surge current that flows through an arrester when sparkover occurs. discharge indicator: A means for indicating that the arrester has discharged.
discharge voltage: The voltage that appears across the terminals of an arrester during passage of discharge current.
discharge voltage-current characteristic: The variation of the crest values of discharge voltage with respect to discharge current.
NOTE — This characteristic is normally shown as a graph based on three or more current-surge measurements of the same wave shape hut of different crest values.
discharge withstand current rating: The specified magnitude and wave shape of a discharge current that can be applied to an arrester a specified number of times without causing damage to it.
disruptive discharge: The sudden and large increase in current through an insulating medium, due to the complete failure of the medium under the electrostatic stress.
fault-current withstand: The maximum rms symmetrical fault current of a specified duration that a failed distribution class arrester will withstand without an explosive fracture of the housing.
fault current: The current from the connected power system that flows in a short circuit. flashover: A disruptive discharge around or over the surface of a solid or liquid insulator.IEEE C62.1 pdf download.