Polymer-housed Metal Oxide Surge Arresters without Gaps for A.C. Systems
1 Scope
This standard applies to polymer-housed metal oxide surge arresters without gaps designed to limit overvoltage on A.C. power circuits.
This standard specifies such contents as the technical requirements, test methods and inspection rules of polymer-housed metal oxide surge arresters without gaps (hereinafter referred to as arresters) with rated voltage of 468kV or below.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 191 Packaging-Pictorial Marking for Handling of Goods (GB/T 191-2000, eqv ISO 780: 1997)
GB 311.1 Insulation Coordination for High Voltage Transmission and Distribution Equipment (GB 311.1-1997, neq IEC 60071-1: 1993)
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 2900.12 Electrotechnical Terminology - Surge Arrester
GB/T 2900.19 Electrotechnical Terminology - High-voltage Test Technique and Insulation Coordination
GB/T 6553 Test Methods for Evaluating Resistance to Tracking and Erosion of Electrical Insulating Materials Used under Severe Ambient Conditions
GB 11032-2000 Metal-oxide Surge Arresters without Gaps for A.C. Systems (eqv IEC 60099-4: 1991)
GB/T 16927.2 High Voltage Test Techniques - Part 2: Measuring Systems (GB/T 16927.2-1997, eqv IEC 60060-2: 1994)
GB/T 19519-2004 Composite Insulators for A.C. Overhead Lines with a Nominal Voltage Greater than 1000V - Definitions, Test Methods and Acceptance Criteria
JB/T 7618 Sealing Tests of Surge Arresters
JB/T 9673 Packet of Insulators
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 2900.12, GB/T 2900.19, GB 11032 and GB/T 19519 and the following apply.
3.1
housing and sheds
housing is an external insulating part of an arrester which provides the necessary creepage distance and protects the internal parts from the environment; housing may consist of several parts providing mechanical strength and protection against the environment
shed is an insulating part projecting from the housing intended to increase the creepage distance
3.2
polymer-housed metal oxide surge attesters without gaps
arresters without gaps composed of non-linear metal-oxide resistors and corresponding spare parts and with their housings and sheds made of polymeric insulating materials
3.3
transmission line arrester
arrester installed on transmission line and mainly used for limiting the lightning overvoltage and operating overvoltage on line
3.4
electrical unit
portion of an arrester in which each end of the unit is terminated with an electrode which is exposed to the external environment
3.5
mechanical unit
portion of an arrester in which the resistors within the unit are mechanically restrained from moving in an axial direction
4 Identification and Classification
4.1 Arrester Identification
Arresters shall be identified by the following minimum information which shall appear on a nameplate permanently attached to the arrester:
——arrester type;
——continuous operating voltage;
——rated voltage;
——DC reference voltage;
——rated frequency (if the rated frequency of arrester is the same as the frequency specified in 5.2, no identification is required);
——nominal discharge current and residual voltage at nominal discharge current;
——rated short-circuit current in kA (r.m.s.);
——the manufacturer's name or trade mark;
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Identification and Classification
4.1 Arrester Identification
4.2 Arrester Classification
5 Standard Ratings
5.1 Standard Rated Voltages
5.2 Rated Frequencies of Arresters
5.3 Nominal Discharge Currents of Arresters
6 Service Conditions of Arresters
6.1 Normal Service Conditions
6.2 Abnormal Service Conditions
7 Technical Requirements
7.1 Manufacturing Requirements of Arresters
7.2 Mechanical Performance of Arresters
7.3 Residual Voltages of Arresters
7.4 Reference Voltages of Arresters
7.5 Leakage Currents of Arresters at 0.75 Times of DC Reference Voltage
7.6 Long Duration Current Impulse Withstand Capacity
7.7 High Current Impulse Withstand Capacity
7.8 Sealing Performance of Arresters
7.9 Continuous Currents of Arresters
7.10 Operating Duty Characteristics of Arresters
7.11 Power-frequency Withstand Voltage Versus Time Characteristic of An Arrester
7.12 External Insulation Withstand Capacity of Polymeric Housing of Arrester
7.13 Nominal Specific Creepage Distance Requirements for Polymeric Housing of Arrester
7.14 Appearance Requirements for Polymeric Housing of Arrester
7.15 Requirements for Thermomechanical Test and Water Immersion Test
7.16 Requirements for Resistance to Tracking and Erosion of Polymeric Housing of Arrester
7.17 Partial Discharge and Radio Interference Voltage of Arrester
7.18 Current Distribution of Multi-column Arrester
7.19 Short-circuit Current Requirements
7.20 Disconnector
8 Test Methods
8.1 Measuring Equipment and Accuracy
8.2 Test Specimens
8.3 Power-frequency Reference Voltage Test
8.4 DC Reference Voltage Test
8.5 Leakage Current Test at 0.75 Times of DC Reference Voltage
8.6 Residual Voltage Test
8.7 High Current Impulse Withstand Test
8.8 Long-duration Current Impulse Withstand Test
8.9 Continuous Current Test
8.10 Operating Duty Test
8.11 Power-frequency Withstand Voltage Versus Time Characteristic Test
8.12 Sealing Test
8.13 External insulation test of polymeric housing of arrester
8.14 Inspection for minimum nominal specific creepage distance of polymeric housing of arrester
8.15 Appearance Inspection for Polymeric Housing of Arrester
8.16 Tracking and Erosion Resistance Test of Polymeric Housing of Arrester
8.17 Partial Discharge and Radio Interference Voltage Test of Arrester
8.18 Tensile Load Test of Arrester
8.19 Bending Load Test of Arrester
8.20 Thermomechanical Test and Water Immersion Test
8.21 Short-circuit Current Test
8.22 Multi-column Arrester Current Distribution Test
8.23 Disconnector Test
8.24 Artificial Pollution Test
9 Inspection Rules
9.1 Type Test
9.2 Routine Test
9.3 Sampling Test
9.4 Periodic Test
9.5 Acceptance Test
10 Packaging, Transportation and Preservation
10.1 Packaging
10.2 Technical Documents Provided Together with Product
10.3 Transportation and Preservation
Figure 1 Thermocycling Sequence of Thermomechanical Test
Figure 2 Bending Load Direction Change Sequence of Thermomechanical Test
Figure 3 Water Immersion Test Procedure
Table 1 Arrester Classification
Table 2 Steps of Rated Voltages
Table 3 Maximum Permissible Horizontal Force F
Table 4 Parameters of Arresters for Typical Power Station and Power Distribution
Table 5 Parameters of Typical Arresters for Transmission Line
Table 6 Parameters of Typical Arresters for Electrified Railway
Table 7 Parameters of Typical Low-voltage Arresters
Table 8 Parameters of Typical Arresters for Parallel Compensation Capacitor
Table 9 Parameters of Typical Arresters for Motor
Table 10 Parameters of Typical Arresters for Transformer Neutral Point
Table 11 Parameters of Typical Arresters for Motor Neutral Point
Table 12 Current Values for Switching Current Impulse Residual Voltage Test of Arrester
Table 13 Long Duration Current Impulse (Rectangular Impulse Current) Test Requirements
Table 14 Line Discharge Test Parameters of Arresters
Table 15 Rectangular Impulse Current Test Values Used for Sampling Test of 20kA, 10kA and 5kA (for Power Station and Line with Rated Voltage of 90kV or Above) Arresters
Table 16 Current Value of High Current Impulse
Table 17 Current Values of Short-circuit Current Test
Table 18 Type Test Items of Arresters
Table 19 Routine Test Items
Table 20 Sampling Test Items
Table 21 Periodic Test Items
