Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
GB/T 14598 Measuring Relays and Protection Equipment comprises the following several parts:
——GB/T 14598.1 Electrical Relays - Part 23: Contact Performance;
——GB/T 14598.2 Measuring Relays and Protection Equipment - Part 1: Common Requirements;
——GB/T 14598.3 Electrical Relays - Part 5: Insulation Coordination for Measuring Relays and Protection Equipment - Requirements and Tests;
——GB/T 14598.4 Electrical Relays - Part 14: Endurance Test for Electrical Relay Contacts - Preferred Values for Contact Loads;
——GB/T 14598.5 Electrical Relays - Part 15: Endurance Tests for Electrical Relay Contacts - Specification for the Characteristics of Test Equipment;
——GB/T 14598.6 Electrical Relays - Part 18: Dimensions for General Purpose All-or-nothing Relays;
——GB/T 14598.7 Electrical Relays - Part 3: Single Input Energizing Quantity Measuring Relays with Dependent or Independent Time;
——GB/T 14598.8 Electrical Relays - Part 20: Protection Systems;
——GB/T 14598.26 Measuring Relays and Protection Equipment - Part 26: Electromagnetic Compatibility Requirements;
——GB 14598.27 Measuring Relays and Protection Equipment - Part 27: Product Safety Requirements;
——GB/T 14598.127 Measuring Relays and Protection Equipment - Part 127: Functional Requirements for Over/Under Voltage Protection;
——GB/T 14598.149 Measuring Relays and Protection Equipment - Part 149: Functional Requirements for Thermal Electrical Relays;
——GB/T 14598.151 Measuring Relays and Protection Equipment - Part 151: Functional Requirements for Over/Under Current Protection;
——GB/T 14598.300 General Specification for Microcomputer-based Transformer Protection Equipment;
——GB/T 14598.301 General Specification of Transformer Fault Oscillograph Equipment for Microprocessor-based Generator;
——GB/T 14598.302 Specification for Arc Flash Protection Equipment;
——GB/T 14598.303 General Specification for Digital Motor Combined Protection Equipment.
This part is Part 302 of GB/T 14598.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Technical Committee on Measuring Relays and Protective Equipment of Standardization Administration of China (SAC/TC 154).
Specification for Arc Flash Protection Equipment
1 Scope
This part of GB/T 14598 specifies the technical requirements, test methods, inspection rules, and marking, labelling, packaging, transportation, storage, etc. of arc flash protection equipment.
This part is applicable to arc flash protection equipment and their interface equipment (hereinafter referred to as the "equipment") and serves as the basis for product design, manufacture, test and application.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 2900.1 Electrotechnical Terminology - Fundamental Terms
GB/T 2900.17 Electrotechnical Terminology - Measuring Relays
GB/T 2900.49 Electrotechnical Terminology - Power System Protection
GB/T 5169.16-2008 Fire Hazard Testing for Electric and Electronic Products - Part 16: Test Flames - 50W Horizontal and Vertical Flame Test Methods
GB/T 7261-2016 Basic Testing Method for Relaying Protection and Security Automatic Equipment
GB/T 9174-2008 General Specification for Transport Packages of General Cargo
GB/T 11287-2000 Electrical Relays - Part 21: Vibration, Shock, Bump and Seismic Tests on Measuring Relays and Protection Equipment - Section One: Vibration Tests (Sinusoidal)
GB/T 14537-1993 Shock and Bump Tests on Measuring Relays and Protection Equipment
GB/T 14598.2-2011 Measuring Relays and Protection Equipment - Part 1: Common Requirements
GB/T 14598.26-2016 Measuring Relays and Protection Equipment - Part 26: Electromagnetic Compatibility Requirements
GB 14598.27-2008 Measuring Relays and Protection Equipment - Part 27: Product Safety Requirements
GB/T 17626.9-2011 Electromagnetic Compatibility - Testing and Measurement Techniques - Pulse Magnetic Field Immunity Test
GB/T 17626.10-1998 Electromagnetic Compatibility - Testing and Measurement Techniques - Damped Oscillatory Magnetic Field Immunity Test
GB/T 19582.1-2008 Modbus Industrial Automation Network Specification - Part 1: Modbus Application Protocol
GB/T 26866-2011 Testing Specifications of Time Synchronism Systems for Power System
DL/T 667 Telecontrol Equipment and Systems - Part 5: Transmission Protocols - Section 103: Companion Standard for the Information Interface of Protection Equipment
DL/T 860 (all parts) Communication Networks and Systems in Substations
3 Terms and Definitions
For the purposes of this document, the following terms and definitions given in GB/T 2900.1, GB/T 2900.17 and GB/T 2900.49 and the following apply
3.1
arc flash protection equipment
protection equipment used for rapidly disconnecting the corresponding failure equipment via outlet, with the arc flash signal generated during failure of primary power equipment as the main criteria and with the current signal and other failure quantities as the auxiliary criteria
3.2
arc flash sensor
sensor used for sensing the arc flash intensity
4 Technical Requirements
4.1 Environmental Conditions
4.1.1 Normal working atmospheric conditions
Normal working atmospheric conditions are as follows:
a) Ambient temperature: -10℃~+55℃;
b) Relative humidity: 5%~95% (there shall be no condensation or freezing inside the equipment);
c) Atmospheric pressure: 86kPa~106kPa.
4.1.2 Test reference conditions
The test reference conditions are as follows:
a) Ambient temperature: +20℃±5℃;
b) Relative humidity: 45%~75%;
c) Atmospheric pressure: 86kPa~106kPa.
4.1.3 Limiting ambient temperature for transportation and storage
The limiting ambient temperatures for transportation of equipment are -40℃ and +70℃ and those for storage are -25℃ and +55℃. Under the condition without imposing any energizing quantity, there shall be no irreversible change. After temperature recovery, the performance of equipment shall meet those specified in GB/T 9174-2008.
4.1.4 Surrounding environment
At the using location of equipment, there shall be no explosion hazard, corrosive gas, conductive dust, severe mold, intense light source, violent vibration source, and electric disturbance exceeding the requirement in 4.12; there shall be proper protective measures against rain, snow, wind, sand, dust and static electricity.
4.1.5 Special environmental conditions
Where the environmental conditions exceed those specified in 4.1.1~4.1.4, they shall be agreed by user and manufacturer.
4.2 Appearance and Structural Requirements
4.2.1 Surface coating of equipment shall be uniform, firm and free from debacle and burr, and the characters and symbols on it shall be correct, clear and firm.
4.2.2 The plugin units of equipment shall be capable of being plugged in and out flexibly, contact reliably and shall have good interchangeability, and the press keys shall be reliable and flexible.
4.3 Rated Electrical Parameters
4.3.1 AC power supply
Rated parameters of AC power supply for the equipment are as follows:
a) Rated voltage: 220V, with permissible deviation of -20%~+20%;
b) Frequency: 50Hz, with permissible deviation of ±1Hz;
c) Waveform: sinusoidal wave, with waveform distortion no larger than 5%.
4.3.2 DC power supply
Rated parameters of DC power supply for the equipment are as follows:
a) Rated voltage: 220V, 110V;
b) Permissible deviation: -20%~+15%;
c) Ripple factor: ≤5%.
4.3.3 AC sampling current
AC sampling current of the equipment is as follows:
a) Rated current (represented by In below): 1A or 5A;
b) Current measuring range: (0~20)In.
4.3.4 Exit relay
Parameters of relay are as follows:
a) Mechanical life: >10,000 times;
b) Electrical life: >1,000 times;
c) Limit of interrupting capacity: ≥30W, with time constant L/R=40ms;
d) Limit of connecting capacity: ≥1,000W.
4.4 Power Consumption
Power consumption of the equipment shall meet:
a) AC current circuit: when the rated current is 5A, the power consumption per phase shall not be larger than 1.0VA;
when the rated current is 1A, the power consumption per phase shall not be larger than 0.5VA;
b) Power supply circuit: ≤20W (single equipment).
4.5 Main Functions of the Equipment
4.5.1 The equipment shall be independent and integral.
4.5.2 The equipment shall have self-inspection function, including hardware fault, software fault, arc flash sensor abnormality and power loss of equipment, and shall be capable of providing alarm or abnormal signal.
4.5.3 The equipment shall have status indication about operation, tripping, equipment alarm or abnormality, etc.
4.5.4 The equipment shall have information display and inquiry functions, including time, set value, configuration, acquisition quantity and action message.
4.5.5 The equipment shall have arc flash protection function.
4.5.6 The equipment shall have incident record function, at least including self-inspection abnormality of equipment, self-inspection abnormality of arc flash sensor and exit action incident.
4.5.7 The equipment should have timing function.
4.5.8 The equipment should have arc flash delay protection.
4.5.9 The equipment should have arc flash fault location function.
4.5.10 The equipment should have wave recording function, including current wave recording and arc flash recording; current wave record is used for protecting at least 2 cyclic waves before the fault and at least 10 cyclic waves after the fault, sample data of at least 16 points are required for each cyclic wave, and at least 8 wave records are required.
4.5.11 The equipment should be equipped with communication interface, and its communication transmission protocol shall meet the relevant requirements of DL/T 667, DL/T 860 (all parts) or GB/T 19582.1-2008.
4.6 Main Technical Performance of the Equipment
4.6.1 Arc flash single-criterion quick-break protection
Requirements for arc flash quick-break protection are as follows:
a) The mode of single criterion started by arc flash shall be selected;
b) Threshold value range of arc flash action: 5klx~20klx or 1mW/cm2~10mW/cm2;
c) Threshold value error of arc flash action: ≤±20%;
d) Action time (2 times threshold value of arc flash action): ≤10ms.
4.6.2 Arc flash overcurrent double-criteria protection
Requirements for arc flash overcurrent protection are as follows:
a) The mode of double criteria started by arc flash and current shall be selected;
b) Threshold value range of arc flash action: 5klx~20klx or 1mW/cm2~10mW/cm2;
c) Threshold value error of arc flash: ≤±20%;
d) Range of current set value: 0.6In~6In;
e) Error of current set value: ≤±5% or ±0.04In;
f) Action time (2 times threshold value of arc flash action and 2 times current set value): ≤20ms.
4.6.3 Arc flash delay protection
Arc flash delay protection shall act if the fault is still not removed after arc flash single-criterion quick-break protection and arc flash overcurrent double-criteria protection have acted.
Requirements for arc flash delay protection are as follows:
Delay time range: 100ms~300ms.
4.6.4 Timing accuracy
The error of timing accuracy shall not be larger than 1ms.
4.7 Influence of Power Supply Changes
Under normal conditions, when the AC/DC working power supply changes within specified range, the equipment shall work reliably.
4.8 Overload Capacity
AC current circuit: the equipment shall be capable of working continuously under 2 times rated current and be capable of continuing for 1s under 40 times rated current.
After withstanding overload test, the equipment shall be free from such phenomena as insulation damage, liquefaction, carbonization and scorching.
4.9 Insulation Performance
4.9.1 Insulation resistance
The insulation resistance between circuits of the equipment shall be measured with the test instrument with open-circuit voltage of DC 500V, which shall meet the following requirements: the insulation resistance between all conductive circuits and the ground (or the metal frame having favorable contact with the ground) as well as between the conductive circuits free from any electric link shall not be less than 100MΩ.
4.9.2 Dielectric strength
All the conductive circuits to the ground (i.e., enclosure or exposed uncharged metal part) and all conductive circuits free from electric link mutually of the equipment shall be capable of withstanding the power-frequency voltage withstand test for a duration of 1min under the AC power-frequency test voltage of 2kV r.m.s (rated insulation voltage >63V, including DC input circuit to the ground, AC input circuit to the ground, signal output contact to the ground, tripping/closing outlet to the ground, and between circuits free from electric link) or 500V r.m.s (rated insulation voltage ≤63V), without generating any breakdown, flashover and component damage. In case of DC test voltage, the test voltage value shall be 1.4 times the specified value of AC test voltage.
During the test, when any tested circuit is applied with the test voltage, the rest circuits shall be equal-potentially interconnected and grounded.
4.9.3 Impulse voltage
All conductive circuits to the ground (or the metal frame having favorable contact with the ground) and all conductive circuits free from electric link mutually of the equipment shall be capable of withstanding short-time impulse voltage test with standard lightning wave. Where the rated insulation voltage is less than or equal to 63V, the open-circuit test voltage shall be 1kV; otherwise, the open-circuit test voltage shall be 5kV. After the test, the performance of the equipment shall meet the relevant requirements.
4.10 Environmental Performance
4.10.1 Influence of environmental changes
Under normal conditions, when the temperature changes within specified range, the equipment shall work reliably.
4.10.2 Damp heat resistance
The equipment shall be capable of withstanding the cyclic damp heat test specified in 10.5 of GB/T 7261-2016. The insulation resistance between all conductive circuits and the exposed uncharged positions/enclosure as well as between the circuits free from electric link shall be measured, which shall not be less than 10MΩ.
Foreword III
1 Scope
2 Normative References
3 Terms and Definitions
4 Technical Requirements
4.1 Environmental Conditions
4.2 Appearance and Structural Requirements
4.3 Rated Electrical Parameters
4.4 Power Consumption
4.5 Main Functions of the Equipment
4.6 Main Technical Performance of the Equipment
4.7 Influence of Power Supply Changes
4.8 Overload Capacity
4.9 Insulation Performance
4.10 Environmental Performance
4.11 Mechanical Performance
4.12 Electromagnetic Compatibility Requirements
4.13 Continuous-current Test
4.14 Safety Performance
5 Test Methods
5.1 Test Conditions
5.2 Transportation and Storage Limiting Ambient Temperature Test
5.3 Test of Influence of Ambient Temperature Change on the Performance
5.4 Appearance and Structure Inspection
5.5 Relay Contact Performance Test
5.6 Power Consumption Test
5.7 Tests of Main Functions of the Equipment
5.8 Tests of Main Technical Performance of the Equipment
5.9 Power Supply Change Influence Tests
5.10 Overload Capacity Test
5.11 Insulation Performance Inspection
5.12 Environmental Performance Tests
5.13 Mechanical Performance Tests
5.14 Electromagnetic Compatibility Requirement Tests
5.15 Continuous-current Test
5.16 Safety Performance Tests
6 Inspection Rules
6.1 General Requirements
6.2 End-of-manufacturing Inspection
6.3 Type Inspection
7 Marking, Packaging, Transportation and Storage
7.1 Marking
7.2 Packaging
7.3 Transportation
7.4 Storage
8 Others
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
GB/T 14598 Measuring Relays and Protection Equipment comprises the following several parts:
——GB/T 14598.1 Electrical Relays - Part 23: Contact Performance;
——GB/T 14598.2 Measuring Relays and Protection Equipment - Part 1: Common Requirements;
——GB/T 14598.3 Electrical Relays - Part 5: Insulation Coordination for Measuring Relays and Protection Equipment - Requirements and Tests;
——GB/T 14598.4 Electrical Relays - Part 14: Endurance Test for Electrical Relay Contacts - Preferred Values for Contact Loads;
——GB/T 14598.5 Electrical Relays - Part 15: Endurance Tests for Electrical Relay Contacts - Specification for the Characteristics of Test Equipment;
——GB/T 14598.6 Electrical Relays - Part 18: Dimensions for General Purpose All-or-nothing Relays;
——GB/T 14598.7 Electrical Relays - Part 3: Single Input Energizing Quantity Measuring Relays with Dependent or Independent Time;
——GB/T 14598.8 Electrical Relays - Part 20: Protection Systems;
——GB/T 14598.26 Measuring Relays and Protection Equipment - Part 26: Electromagnetic Compatibility Requirements;
——GB 14598.27 Measuring Relays and Protection Equipment - Part 27: Product Safety Requirements;
——GB/T 14598.127 Measuring Relays and Protection Equipment - Part 127: Functional Requirements for Over/Under Voltage Protection;
——GB/T 14598.149 Measuring Relays and Protection Equipment - Part 149: Functional Requirements for Thermal Electrical Relays;
——GB/T 14598.151 Measuring Relays and Protection Equipment - Part 151: Functional Requirements for Over/Under Current Protection;
——GB/T 14598.300 General Specification for Microcomputer-based Transformer Protection Equipment;
——GB/T 14598.301 General Specification of Transformer Fault Oscillograph Equipment for Microprocessor-based Generator;
——GB/T 14598.302 Specification for Arc Flash Protection Equipment;
——GB/T 14598.303 General Specification for Digital Motor Combined Protection Equipment.
This part is Part 302 of GB/T 14598.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by the China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Technical Committee on Measuring Relays and Protective Equipment of Standardization Administration of China (SAC/TC 154).
Specification for Arc Flash Protection Equipment
1 Scope
This part of GB/T 14598 specifies the technical requirements, test methods, inspection rules, and marking, labelling, packaging, transportation, storage, etc. of arc flash protection equipment.
This part is applicable to arc flash protection equipment and their interface equipment (hereinafter referred to as the "equipment") and serves as the basis for product design, manufacture, test and application.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 2900.1 Electrotechnical Terminology - Fundamental Terms
GB/T 2900.17 Electrotechnical Terminology - Measuring Relays
GB/T 2900.49 Electrotechnical Terminology - Power System Protection
GB/T 5169.16-2008 Fire Hazard Testing for Electric and Electronic Products - Part 16: Test Flames - 50W Horizontal and Vertical Flame Test Methods
GB/T 7261-2016 Basic Testing Method for Relaying Protection and Security Automatic Equipment
GB/T 9174-2008 General Specification for Transport Packages of General Cargo
GB/T 11287-2000 Electrical Relays - Part 21: Vibration, Shock, Bump and Seismic Tests on Measuring Relays and Protection Equipment - Section One: Vibration Tests (Sinusoidal)
GB/T 14537-1993 Shock and Bump Tests on Measuring Relays and Protection Equipment
GB/T 14598.2-2011 Measuring Relays and Protection Equipment - Part 1: Common Requirements
GB/T 14598.26-2016 Measuring Relays and Protection Equipment - Part 26: Electromagnetic Compatibility Requirements
GB 14598.27-2008 Measuring Relays and Protection Equipment - Part 27: Product Safety Requirements
GB/T 17626.9-2011 Electromagnetic Compatibility - Testing and Measurement Techniques - Pulse Magnetic Field Immunity Test
GB/T 17626.10-1998 Electromagnetic Compatibility - Testing and Measurement Techniques - Damped Oscillatory Magnetic Field Immunity Test
GB/T 19582.1-2008 Modbus Industrial Automation Network Specification - Part 1: Modbus Application Protocol
GB/T 26866-2011 Testing Specifications of Time Synchronism Systems for Power System
DL/T 667 Telecontrol Equipment and Systems - Part 5: Transmission Protocols - Section 103: Companion Standard for the Information Interface of Protection Equipment
DL/T 860 (all parts) Communication Networks and Systems in Substations
3 Terms and Definitions
For the purposes of this document, the following terms and definitions given in GB/T 2900.1, GB/T 2900.17 and GB/T 2900.49 and the following apply
3.1
arc flash protection equipment
protection equipment used for rapidly disconnecting the corresponding failure equipment via outlet, with the arc flash signal generated during failure of primary power equipment as the main criteria and with the current signal and other failure quantities as the auxiliary criteria
3.2
arc flash sensor
sensor used for sensing the arc flash intensity
4 Technical Requirements
4.1 Environmental Conditions
4.1.1 Normal working atmospheric conditions
Normal working atmospheric conditions are as follows:
a) Ambient temperature: -10℃~+55℃;
b) Relative humidity: 5%~95% (there shall be no condensation or freezing inside the equipment);
c) Atmospheric pressure: 86kPa~106kPa.
4.1.2 Test reference conditions
The test reference conditions are as follows:
a) Ambient temperature: +20℃±5℃;
b) Relative humidity: 45%~75%;
c) Atmospheric pressure: 86kPa~106kPa.
4.1.3 Limiting ambient temperature for transportation and storage
The limiting ambient temperatures for transportation of equipment are -40℃ and +70℃ and those for storage are -25℃ and +55℃. Under the condition without imposing any energizing quantity, there shall be no irreversible change. After temperature recovery, the performance of equipment shall meet those specified in GB/T 9174-2008.
4.1.4 Surrounding environment
At the using location of equipment, there shall be no explosion hazard, corrosive gas, conductive dust, severe mold, intense light source, violent vibration source, and electric disturbance exceeding the requirement in 4.12; there shall be proper protective measures against rain, snow, wind, sand, dust and static electricity.
4.1.5 Special environmental conditions
Where the environmental conditions exceed those specified in 4.1.1~4.1.4, they shall be agreed by user and manufacturer.
4.2 Appearance and Structural Requirements
4.2.1 Surface coating of equipment shall be uniform, firm and free from debacle and burr, and the characters and symbols on it shall be correct, clear and firm.
4.2.2 The plugin units of equipment shall be capable of being plugged in and out flexibly, contact reliably and shall have good interchangeability, and the press keys shall be reliable and flexible.
4.3 Rated Electrical Parameters
4.3.1 AC power supply
Rated parameters of AC power supply for the equipment are as follows:
a) Rated voltage: 220V, with permissible deviation of -20%~+20%;
b) Frequency: 50Hz, with permissible deviation of ±1Hz;
c) Waveform: sinusoidal wave, with waveform distortion no larger than 5%.
4.3.2 DC power supply
Rated parameters of DC power supply for the equipment are as follows:
a) Rated voltage: 220V, 110V;
b) Permissible deviation: -20%~+15%;
c) Ripple factor: ≤5%.
4.3.3 AC sampling current
AC sampling current of the equipment is as follows:
a) Rated current (represented by In below): 1A or 5A;
b) Current measuring range: (0~20)In.
4.3.4 Exit relay
Parameters of relay are as follows:
a) Mechanical life: >10,000 times;
b) Electrical life: >1,000 times;
c) Limit of interrupting capacity: ≥30W, with time constant L/R=40ms;
d) Limit of connecting capacity: ≥1,000W.
4.4 Power Consumption
Power consumption of the equipment shall meet:
a) AC current circuit: when the rated current is 5A, the power consumption per phase shall not be larger than 1.0VA;
when the rated current is 1A, the power consumption per phase shall not be larger than 0.5VA;
b) Power supply circuit: ≤20W (single equipment).
4.5 Main Functions of the Equipment
4.5.1 The equipment shall be independent and integral.
4.5.2 The equipment shall have self-inspection function, including hardware fault, software fault, arc flash sensor abnormality and power loss of equipment, and shall be capable of providing alarm or abnormal signal.
4.5.3 The equipment shall have status indication about operation, tripping, equipment alarm or abnormality, etc.
4.5.4 The equipment shall have information display and inquiry functions, including time, set value, configuration, acquisition quantity and action message.
4.5.5 The equipment shall have arc flash protection function.
4.5.6 The equipment shall have incident record function, at least including self-inspection abnormality of equipment, self-inspection abnormality of arc flash sensor and exit action incident.
4.5.7 The equipment should have timing function.
4.5.8 The equipment should have arc flash delay protection.
4.5.9 The equipment should have arc flash fault location function.
4.5.10 The equipment should have wave recording function, including current wave recording and arc flash recording; current wave record is used for protecting at least 2 cyclic waves before the fault and at least 10 cyclic waves after the fault, sample data of at least 16 points are required for each cyclic wave, and at least 8 wave records are required.
4.5.11 The equipment should be equipped with communication interface, and its communication transmission protocol shall meet the relevant requirements of DL/T 667, DL/T 860 (all parts) or GB/T 19582.1-2008.
4.6 Main Technical Performance of the Equipment
4.6.1 Arc flash single-criterion quick-break protection
Requirements for arc flash quick-break protection are as follows:
a) The mode of single criterion started by arc flash shall be selected;
b) Threshold value range of arc flash action: 5klx~20klx or 1mW/cm2~10mW/cm2;
c) Threshold value error of arc flash action: ≤±20%;
d) Action time (2 times threshold value of arc flash action): ≤10ms.
4.6.2 Arc flash overcurrent double-criteria protection
Requirements for arc flash overcurrent protection are as follows:
a) The mode of double criteria started by arc flash and current shall be selected;
b) Threshold value range of arc flash action: 5klx~20klx or 1mW/cm2~10mW/cm2;
c) Threshold value error of arc flash: ≤±20%;
d) Range of current set value: 0.6In~6In;
e) Error of current set value: ≤±5% or ±0.04In;
f) Action time (2 times threshold value of arc flash action and 2 times current set value): ≤20ms.
4.6.3 Arc flash delay protection
Arc flash delay protection shall act if the fault is still not removed after arc flash single-criterion quick-break protection and arc flash overcurrent double-criteria protection have acted.
Requirements for arc flash delay protection are as follows:
Delay time range: 100ms~300ms.
4.6.4 Timing accuracy
The error of timing accuracy shall not be larger than 1ms.
4.7 Influence of Power Supply Changes
Under normal conditions, when the AC/DC working power supply changes within specified range, the equipment shall work reliably.
4.8 Overload Capacity
AC current circuit: the equipment shall be capable of working continuously under 2 times rated current and be capable of continuing for 1s under 40 times rated current.
After withstanding overload test, the equipment shall be free from such phenomena as insulation damage, liquefaction, carbonization and scorching.
4.9 Insulation Performance
4.9.1 Insulation resistance
The insulation resistance between circuits of the equipment shall be measured with the test instrument with open-circuit voltage of DC 500V, which shall meet the following requirements: the insulation resistance between all conductive circuits and the ground (or the metal frame having favorable contact with the ground) as well as between the conductive circuits free from any electric link shall not be less than 100MΩ.
4.9.2 Dielectric strength
All the conductive circuits to the ground (i.e., enclosure or exposed uncharged metal part) and all conductive circuits free from electric link mutually of the equipment shall be capable of withstanding the power-frequency voltage withstand test for a duration of 1min under the AC power-frequency test voltage of 2kV r.m.s (rated insulation voltage >63V, including DC input circuit to the ground, AC input circuit to the ground, signal output contact to the ground, tripping/closing outlet to the ground, and between circuits free from electric link) or 500V r.m.s (rated insulation voltage ≤63V), without generating any breakdown, flashover and component damage. In case of DC test voltage, the test voltage value shall be 1.4 times the specified value of AC test voltage.
During the test, when any tested circuit is applied with the test voltage, the rest circuits shall be equal-potentially interconnected and grounded.
4.9.3 Impulse voltage
All conductive circuits to the ground (or the metal frame having favorable contact with the ground) and all conductive circuits free from electric link mutually of the equipment shall be capable of withstanding short-time impulse voltage test with standard lightning wave. Where the rated insulation voltage is less than or equal to 63V, the open-circuit test voltage shall be 1kV; otherwise, the open-circuit test voltage shall be 5kV. After the test, the performance of the equipment shall meet the relevant requirements.
4.10 Environmental Performance
4.10.1 Influence of environmental changes
Under normal conditions, when the temperature changes within specified range, the equipment shall work reliably.
4.10.2 Damp heat resistance
The equipment shall be capable of withstanding the cyclic damp heat test specified in 10.5 of GB/T 7261-2016. The insulation resistance between all conductive circuits and the exposed uncharged positions/enclosure as well as between the circuits free from electric link shall be measured, which shall not be less than 10MΩ.
Contents of GB/T 14598.302-2016
Foreword III
1 Scope
2 Normative References
3 Terms and Definitions
4 Technical Requirements
4.1 Environmental Conditions
4.2 Appearance and Structural Requirements
4.3 Rated Electrical Parameters
4.4 Power Consumption
4.5 Main Functions of the Equipment
4.6 Main Technical Performance of the Equipment
4.7 Influence of Power Supply Changes
4.8 Overload Capacity
4.9 Insulation Performance
4.10 Environmental Performance
4.11 Mechanical Performance
4.12 Electromagnetic Compatibility Requirements
4.13 Continuous-current Test
4.14 Safety Performance
5 Test Methods
5.1 Test Conditions
5.2 Transportation and Storage Limiting Ambient Temperature Test
5.3 Test of Influence of Ambient Temperature Change on the Performance
5.4 Appearance and Structure Inspection
5.5 Relay Contact Performance Test
5.6 Power Consumption Test
5.7 Tests of Main Functions of the Equipment
5.8 Tests of Main Technical Performance of the Equipment
5.9 Power Supply Change Influence Tests
5.10 Overload Capacity Test
5.11 Insulation Performance Inspection
5.12 Environmental Performance Tests
5.13 Mechanical Performance Tests
5.14 Electromagnetic Compatibility Requirement Tests
5.15 Continuous-current Test
5.16 Safety Performance Tests
6 Inspection Rules
6.1 General Requirements
6.2 End-of-manufacturing Inspection
6.3 Type Inspection
7 Marking, Packaging, Transportation and Storage
7.1 Marking
7.2 Packaging
7.3 Transportation
7.4 Storage
8 Others
