This standard applies to metal-oxide surge arrester without gaps (hereinafter referred to as "arrester") designed to limit overvoltage on AC power system.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties who enter into agreement according to these specifications are encouraged to research whether the latest editions of these documentations are applied or not. For undated references, the latest edition of the referenced document is applicable to this standard.
GB/T 191-2000 "Packaging-Pictorial Marking for Handling of Goods" (eqv ISO 780:1997)
GB 311.1-1997 "Insulation Co-ordination for High Voltage Transmission and Distribution Equipment" (neq IEC 60071-1:1993)
GB/T 311.2-2002 "Insulation Co-ordination-Part 2: Application Guide forInsulation Co-ordination for High Voltage Transmission and Distribution Equipment" (eqv IEC 60071-2:1996)
GB/T 775.1-2000 "Test Method for Insulators-Part 1: General Test Methods"
GB/T 775.3-2006 "Test Method for Insulators-Part 3: Mechanical Test Methods"
GB/T 2423.17-1993 "Basic Environmental Testing Procedures for Electric and Electronic Products-Test Ka: Salt Mist Test Method" (eqv IEC 68-2-11:1981)
GB/T 2423.22-2002 "Environmental Testing for Electric and Electronic Products-Part 2: Test Methods-Test N: Change of Temperature" (IEC 60068-2-14:1984, IDT)
GB/T 2900.12-2008 "Electrotechnical Terminology-Surge Arresters, Low-voltage Surge Protective Devices and Components"
GB/T 2900.19-1994 "Electrotechnical Terminology-High-voltage Test Technique and Insulation Co-ordination"
GB 3906-2006 "Alternating-current Metal-enclosed Switchgear and Controlgear for Rated Voltages above 3.6kV and up to and Including 40.5kV" (IEC 62271-200:2003, MOD)
GB/T 4585-2004 "Artificial Pollution Tests on High-voltage Insulators to Be Used on A.c. Systems" (IEC 60507:1991, IDT)
GB/T 6553-2003 "Test Methods for Evaluating Resistance to Tracking and Erosion of Electrical Insulating Materials Used under Severe Ambient Conditions" (IEC 60587:1984, IDT)
GB/T 7354-2003 "Partial Discharge Measurements" (IEC 60270:2000, IDT)
GB 7674-1997 "Gas-insulated Metal-enclosed Switchgear for Rated Voltages of 72.5 kV and above" (IEC 60517:1990, MOD)
GB/T 8905-1996 "The Guide for Processing and Measuring SF6 Gas in Power Apparatus" (IEC 60480:1974, neq; IEC 60376:1971, neq)
GB/T 11023-1989 "Test Guide of SF6 Gas Tightness for High-voltage Switchgear"
GB/T 16927.1-1997 "Hign Voltage Test Techniques-Part 1: General Test Requirements" (eqv IEC 60060-1:1989)
GB/T 16927.2-1997 "High Voltage Test Techniques-Part 2: Measuring Systems" (eqv IEC 60060-2:1994)
GB/T 17467-1998 "High-voltage/Low-voltage Prefabricated Substations" (eqv IEC 61330:1995)
GB/T 19519-2004 "Composite Insulators for A.c. Overhead Lines with a Nominal Voltage Greater than 1000V-Definitions,Test Methods and Acceptance Criteria" (IEC 61109:1992, MOD)
IEC 60068-2-42:2003 "Environmental Testing-Part 2-42: Tests-Test Kc: Sulphur Dioxide Test for Contacts and Connections"
IEC 60815:1986 "Guide for the Selection of Insulators in Respect of Polluted Conditions"
IEC 61166:1993 "High-voltage Alternating Current Circuit-breakers-Guide for Seismic Qualification of High-voltage Alternating Current Circuit-breakers"
CISPR 16-1:1999 "Specification for Radio Disturbance and Immunity Measuring Apparatus and Methods-Part 1: Radio Disturbance and Immunity Measuring Apparatus"
CISPR 18-2:1986 "Radio Interference Characteristics of Overhead Power Lines and High-voltage Equipment-Part 2: Methods of Measurement and Procedure for Determining Limits"
JB/T 7618-1994 "Leakage Test for Surge Arresters-Bath Method"
JB/T 9673-1999 "Packet of Insulators"
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
The terms used in this standard shall comply with this standard, in addition, the rest shall comply with GB/T 2900.12-2008 and GB/T 2900.19-1994.
3.1
Metal-oxide surge arrester without gaps
Arrester having non-linear metal-oxide resistors connected in series and/or in parallel without any integrated series or parallel spark gaps.
3.2
Non-linear metal-oxide resistor
Part of the surge arrester which, by its non-linear voltage versus current characteristics, acts as a low resistance to overvoltages, thus limiting the voltage across the arrester terminals, and as a high resistance at normal power-frequency voltage (non-linear metal-oxide resistor, hereinafter referred to as "resistor").
3.3
Internal grading system of an arrester
Grading impedances, in particular grading capacitors connected in parallel to one single or to a group of non-linear metal-oxide resistors, to control the voltage distribution along the metal-oxide resistor stack.
3.4
Grading ring of an arrester
Metal part, usually circular in shape, mounted to modify electrostatically the voltage distribution along the arrester.
3.5
Section of an arrester
Complete, suitably assembled part of an arrester necessary to represent the behaviour of a complete arrester with respect to a particular test. A section of an arrester is not necessarily a unit of an arrester.
3.6
Unit of an arrester
Completely housed part of an arrester which may be connected in series and/or in parallel with other units to construct an arrester of higher rated voltage and/or higher nominal discharge current rating. A unit of an arrester is not necessarily a section of an arrester.
3.7
Pressure-relief device of an arrester
Means for relieving internal pressure in an arrester and preventing violent shattering of the housing following prolonged passage of fault current or internal flashover of the arrester.
3.8
Rated voltage of an arrester
Ur
Maximum permissible r.m.s. value of power-frequency voltage between its terminals at which it is designed to operate correctly under temporary overvoltage conditions as established in the operating duty tests (see 8.5).
Note 1: The rated voltage is used as a reference parameter for the specification of operating characteristics.
Note 2: The rated voltage as defined in this standard is the 10s power-frequency voltage used in the operating duty test after high-current or long-duration impulses.
Tests used to establish the voltage rating in IEC 60099-1, as well as some national standards, involve the application of repetitive impulses at nominal current with power-frequency voltage applied. Attention is drawn to the fact that these two methods used to establish rating do not necessarily produce equivalent values (a resolution to this discrepancy is under consideration).
3.9
Continuous operating voltage of an arrester
Uc
Designated permissible r.m.s. value of power-frequency voltage that may be applied continuously between the arrester terminals in accordance with 8.5.
3.10
Rated frequency of an arrester
Frequency of the power system on which the arrester is designed to be used.
3.11
Disruptive discharge
Phenomenon associated with the failure of insulation under electric stress, which include a collapse of voltage and the passage of current.
Note 1: The term applies to electrical breakdowns in solid, liquid and gaseous dielectric, and combinations of these.
Note 2: A disruptive discharge in a solid dielectric produces permanent loss of electric strength. In a liquid or gaseous dielectric the loss may be only temporary.
3.12
Puncture; breakdown
Disruptive discharge through a solid.
3.13
Flashover
Disruptive discharge over a solid surface.
