1 Scope
This standard specifies the terms and definitions, test items and test methods of SF6 gas tightness for high-voltage switchgear.
The test method specified in this standard is used to determine the relative yearly leakage rate of switchgear/compartment.
This standard is applicable to the test of gas tightness for high-voltage switchgear with SF6 gas as insulation and/or arc-extinguishing medium.
Note: This standard may serve as a reference for the test of gas tightness for high-voltage switchgear with other gases as operation, insulation and/or arc-extinguishing medium or other electrical equipment (such as SF6 current transformer, etc.)
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/T 11022-2011 Common specifications for high-voltage switchgear and controlgear standards
GB/T 15823-2009 Non-destructive testing - Test methods for helium leak testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 11022-2011 and the following apply. For the convenience of application, some terms and definitions specified in GB/T 11022-2011 are listed below.
3.1
gas-filled compartment
compartment of switchgear or controlgear, the gas pressure inside which is maintained by one of the following systems:
a) controlled pressure system;
b) closed pressure system;
c) sealed pressure system
Note: Several gas-filled compartments may be permanently connected into a common gas system (gas tightness assembly).
[GB/T 11022-2011, Definition 3.6.6.1]
3.2
controlled pressure system for gas
space automatically supplied with air from external compressed air source or internal air source
Note 1: Controlled pressure systems including air circuit breaker (gas blast circuit breaker) or air operating mechanism.
Note 2: A space may consist of several permanently connected gas-filled compartments.
[GB/T 11022-2011, Definition 3.6.6.2]
3.3
closed pressure system for gas
space manually connected to an external air source for replenishment where necessary
Note: It is revised from GB/T 11022-2011, Definition 3.6.6.3.
3.4
sealed pressure system for gas
space with no need for further treatment of gas during the scheduled service life
Note 1: The assembly and test of gas sealing pressure system are all carried out in the factory.
Note 2: The expected service life begins when the device is sealed.
Note 3: It is revised from GB/T 11022-2011, Definition 3.6.6.4.
3.5
rated filling pressure pre (or density ρre)
pressure (or density) for insulation and/or switching filled into the gas-filled compartment before being put into operation or automatic replenishment, which may be expressed by relative pressure or absolute pressure when it is converted under standard atmospheric conditions of +20℃ and 101.3kPa
Note: It is revised from GB/T 11022-2011, Definition 3.6.5.1.
3.6
alarm pressure pae (or density ρae)
pressure (or density) for insulation and/or switching, which may be expressed by relative pressure or absolute pressure when it is converted under standard atmospheric conditions of +20℃ and 101.3kPa, at which a monitoring signal may be given
Note: It is revised from GB/T 11022-2011, Definition 3.6.5.3.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test items
4.1 General
4.2 Tightness test at room temperature
4.3 High- and low-temperature tightness tests
5 Test methods
5.1 Qualitative leakage detecting
5.2 Quantitative leakage detecting
Annex A (Informative) Tightness (information, example and guidance instruction)
Annex B (Informative) Examples for quantitative leakage detecting
Annex C (Informative) Principle and spectrum examples of infrared imaging sniffing
Bibliography
1 Scope
This standard specifies the terms and definitions, test items and test methods of SF6 gas tightness for high-voltage switchgear.
The test method specified in this standard is used to determine the relative yearly leakage rate of switchgear/compartment.
This standard is applicable to the test of gas tightness for high-voltage switchgear with SF6 gas as insulation and/or arc-extinguishing medium.
Note: This standard may serve as a reference for the test of gas tightness for high-voltage switchgear with other gases as operation, insulation and/or arc-extinguishing medium or other electrical equipment (such as SF6 current transformer, etc.)
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/T 11022-2011 Common specifications for high-voltage switchgear and controlgear standards
GB/T 15823-2009 Non-destructive testing - Test methods for helium leak testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 11022-2011 and the following apply. For the convenience of application, some terms and definitions specified in GB/T 11022-2011 are listed below.
3.1
gas-filled compartment
compartment of switchgear or controlgear, the gas pressure inside which is maintained by one of the following systems:
a) controlled pressure system;
b) closed pressure system;
c) sealed pressure system
Note: Several gas-filled compartments may be permanently connected into a common gas system (gas tightness assembly).
[GB/T 11022-2011, Definition 3.6.6.1]
3.2
controlled pressure system for gas
space automatically supplied with air from external compressed air source or internal air source
Note 1: Controlled pressure systems including air circuit breaker (gas blast circuit breaker) or air operating mechanism.
Note 2: A space may consist of several permanently connected gas-filled compartments.
[GB/T 11022-2011, Definition 3.6.6.2]
3.3
closed pressure system for gas
space manually connected to an external air source for replenishment where necessary
Note: It is revised from GB/T 11022-2011, Definition 3.6.6.3.
3.4
sealed pressure system for gas
space with no need for further treatment of gas during the scheduled service life
Note 1: The assembly and test of gas sealing pressure system are all carried out in the factory.
Note 2: The expected service life begins when the device is sealed.
Note 3: It is revised from GB/T 11022-2011, Definition 3.6.6.4.
3.5
rated filling pressure pre (or density ρre)
pressure (or density) for insulation and/or switching filled into the gas-filled compartment before being put into operation or automatic replenishment, which may be expressed by relative pressure or absolute pressure when it is converted under standard atmospheric conditions of +20℃ and 101.3kPa
Note: It is revised from GB/T 11022-2011, Definition 3.6.5.1.
3.6
alarm pressure pae (or density ρae)
pressure (or density) for insulation and/or switching, which may be expressed by relative pressure or absolute pressure when it is converted under standard atmospheric conditions of +20℃ and 101.3kPa, at which a monitoring signal may be given
Note: It is revised from GB/T 11022-2011, Definition 3.6.5.3.
Contents of GB/T 11023-2018
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test items
4.1 General
4.2 Tightness test at room temperature
4.3 High- and low-temperature tightness tests
5 Test methods
5.1 Qualitative leakage detecting
5.2 Quantitative leakage detecting
Annex A (Informative) Tightness (information, example and guidance instruction)
Annex B (Informative) Examples for quantitative leakage detecting
Annex C (Informative) Principle and spectrum examples of infrared imaging sniffing
Bibliography
