1 Scope
This standard specifies terms and definitions, structural style, product model, installation dimension, performance parameter, technical requirements, test methods, inspection rules as well as marking, packing, transport and storage for pressure relief devices for transformers (hereinafter referred to as "relief devices").
This standard is applicable to relief devices which are installed on oil-immersed transformers, mutual inductors, reactors and switches.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. Parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For the undated references, the latest edition of the normative documents is applicable to this standard.
Contents
Foreword III
1 Scope
2 Normative References
3 Terms and Definitions
4 Structural Style, Product Model and Installation Dimension
4.1 Structural Style
4.2 Product Model
4.3 Effective Aperture and Installation Dimension of Relief Devices
4.4 Specification for Relief Devices
5 Performance Parameters
6 Technical Requirements
6.1 Basic Requirements
6.2 Application Conditions
6.3 Actuation Performance
6.4 Sealing Performance
6.5 Discharge Performance
6.6 Actuation Reliability (500 times)
6.7 Signal Switch Contact Capacity
6.8 Insulation Performance of Signal Switch
6.9 Oil and Aging Resistance Test on Sealing Ring
6.10 Requirements for Appearance Quality
6.11 Requirements for Protection Performance
6.12 Moisture-proof and Salt-mist-resistant Performance
6.13 Anti-vibration Ability
7 Test Methods
7.1 Open Pressure Test
7.2 Close Pressure Test
7.3 Timely Open Performance
7.4 High-temperature Open Performance Test
7.5 Low-temperature Open Performance Test
7.6 Sealing Performance Test
7.7 Displacement Performance Test
7.8 Resistance to Oil and Aging Performance Test on Sealing Ring
7.9 Insulation Performance Test on Signal Switch
7.10 Open Time Test
7.11 Protection Performance Test
7.12 Moisture-proof Performance Test
7.13 Salt-mist-resistant Performance Test
7.14 Anti-vibration Ability Test
8 Inspection Rules
8.1 Routine Test Items
8.2 Type Test Items
8.3 Special Test Items
8.4 Requirements of Type Test on Products
9 Marking, Packing, Transport and Storage
