1 Scope
This standard specifies the marking standard ratings, operation conditions, technical requirements, test methods, inspection rules, packaging, transportation and preservation and installation, etc. of the polymer-housed metal oxide surge arresters with series gap for 1000kV AC power transmission lines.
This standard is applicable to the production, installation and operation of the polymer-housed metal oxide surge arresters with series gap for 1 000kV AC power transmission lines.
This standard is not involved with the support members of arresters with external series gap of insulated support members for lines; the relevant requirements may be in accordance with DL/T 815.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 311.1 Insulation Coordination - Part 1: Definitions, Principles and Rules
GB/T 775.1 Test Method for Insulators - Part 1: General Test Methods
GB/T 775.3 Test Method for Insulators - Part 3: Mechanical Test Methods
GB/T 2317.2 Test Method for Electric Power Fittings - Part 2: Corona and RIV Tests for Electric Power Fittings
GB/T 6553 Electrical Insulating Materials Used under Severe Ambient Conditions - Test Methods for Evaluating Resistance to Tracking and Erosion
GB/T 10700 Test Methods for Elastic Moduli of Fine Ceramics - Bending Method
GB 11032-2010 Metal-oxide Surge Arresters without Gaps for A.C. Systems
GB/T 16927.1 High-voltage Test Techniques - Part 1: General Definitions and Test Requirements
DL/T 815 Polymer-housed Metal Oxide Surge Arresters for AC Power Transmission Lines
JGJ/T 101 Specification for Seismic Test of Buildings
IEC 60099-8 Arrester - Part 8: Metal-oxide Surge Arrester with Series Gap for 1kv or above Power Transmission Lines [Metal-oxide Surge Arresters with External Series Gap (EGLA) for Overhead Transmission and Distribution Lines of A.C. Systems Above 1kV]
3 Terms and Definitions
For the purpose of this document, the following terms and definitions and those specified in GB 11032-2012 and DL/T 815 apply. For the convenience of application, some terms and definitions specified in GB 11032-2010 and DL/T 815 are re-listed below.
3.1
Polymer-housed metal oxide surge arresters with external series gap for AC power transmission lines
The complete arrester with gaps which is composed of external series gap, metal oxide resistor and corresponding spare parts and polymeric housing, only used to protect the line insulator or/and the air gap of line tower head to avoid flashover or breakdown induced by lightning overvoltage, hereinafter referred to as arrester.
3.2
Series varistor unit of polymer-housed metal oxide surge arrester, SVU
That composed of metal oxide resistor and corresponding spare parts, as well as polymeric housing, which forms the complete arrester with gaps together with external series gap and is a part of arrester with gaps, hereinafter referred to as series varistor unit (SVU).
3.3
External series gap
A part of the arrester with gaps, which forms the complete arrester with gaps with the SVU by tandem connection, hereinafter referred to as gaps.
The pure air gap is composed of two electrodes, of which one is fixed at the high-voltage end of the SVU and another on the wire of power transmission lines or at the wire end of insulator string.
3.4
Unit of a SVU
A completely housed part of a SVU which may be connected in series with other units to construct a transmission line arrester of higher voltage or current rating and a complete arrester with gaps in combination with external series gap.
3.5
Section of a SVU
A complete and suitably assembled part of a SVU, which must be able to represent the characteristics of a SVU with respect to a particular test.
3.6
Rated voltage of a transmission line arrester
The maximum permissible r.m.s value of power-frequency voltage between the terminals of the transmission line arrester, at which the arrester is designed to operate correctly. The rated voltage is used as a reference parameter for the power-frequency follow current interrupting characteristics.
3.7
AC reference voltage of a SVU
The maximum peak value of power-frequency voltage measured when a SVU passes through the power-frequency reference current divided by . The power-frequency reference voltage of a SVU composed of multiple units in series is the sum of that of the individual unit.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Identification
5 Standard Ratings
6 Service Conditions
7 Technical Requirements
8 Test Methods
9 Inspection Rules
10 Packaging, Transportation and Preservation
11 Installation
