Norma

ANSIAEEE C62.11-1987

IEEE Standard for Metal-Oxide Surge Arresters for AC Power Circuits

Published by The Institute of Electrical and Electronics Engineers, Inc 345 East 47th Street, New York, N Y 10017, USA
July 24, 1987 SHlllR9

Authorized licensed use limited to: Universidad Industrial de Santander. Downloaded on January 23, 2010 at 09:07 from IEEE Xplore. Restrictions apply.Authorized licensed use limited to: Universidad Industrial de Santander. Downloaded on January 23, 2010 at 09:07 from IEEE Xplore. Restrictions apply.

An American National Standard

IEEE Standard for Metal-Oxide Surge Arresters for AC Power Circuits
1. Scope
This standard applies to metal-oxide surge arresters designed to repeatedly limit the voltage surges on 48 Hz to 62 Hz power circuits bypassing surge discharge current and automatically limiting the flow of system power current. This standard applies to devices for separate mounting and to those supplied integrally with other equipment.

certification tests. Tests run on a regular, periodic basis to verify that selected, key performance characteristics of a product or representative samples thereof have remained withinperformance specifications. classification of arresters. Arrester classification is determined by prescribed test requirements. These classifications are: (1) Station (2) Intermediate (3) Distribution (a) Heavy duty (b) Normal duty (4) Secondary conformance tests. Tests made, when required, to demonstrate selected performance characteristics of a product or representative samples thereof. classificationcurrent. The designated current used to perform the classification tests.
NOTE: See Tables 3 and 4.

2. Definitions
The following definitions apply to metal-oxide surge arresters and do not necessarily cover other applications.

arrester disconnector. A means for disconnecting a n arrester in anticipation of, or after, a failure in order to prevent a permanent fault on the circuit and to giveindication of a failed arrester.
NOTE: Clearing of the fault current through the arrester during disconnection is generally done by the nearest sourceside overcurrent-protective device.

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 oneach design to establish the performance characteristics and to demonstrate compliance with the appropriate standards of the industry. Once made they need not be repeated unless the design is changed so as to modify performance. discharge A for recording the number of arrester discharge operations.
7

basic impulse insulation level (BIL). A reference impulse insulation strength expressed in termsof the crest value of withstand voltage of a standard full impulse voltage wave.
NOTE: See ANSI C92.1-1982 [4].'

' The numbers in brackets correspond to those of the references listed in Section 3 of this standard.

Authorized licensed use limited to: Universidad Industrial de Santander. Downloaded on January 23, 2010 at 09:07 from IEEE Xplore. Restrictions apply.

ANSI / IEEEC62.11-1987

IEEE STANDARD FOR METAL-OXIDE SURGE

discharge current. The surge current that flows through an arrester. 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 dischargevoltage 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 but of different crest values.

impulse protective level. For a defined waveshape, the higher of the maximum sparkover value or the corresponding discharge-voltage value. impulse protective volt-time characteristic. The...