Some standard content:
Mechanical Industry Standard of the People's Republic of China
Marine Protection Relay
JB/T57761991
This standard refers to the relevant requirements of IEC92 (1980) "Marine Electrical Equipment" and IEC255 "Electrical Maintenance Equipment". 1 Subject Content and Scope of Application
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of protective relays (hereinafter referred to as relays) for marine power systems. This standard applies to relays used for protection in AC and DC shipboard power systems with a supply voltage of 1000V and below. This standard does not apply to thermal relays and secondary electrical protection for non-electrical quantity measurement. 2 Reference standards
GB1497
GB2423.16
GB2423.17
GB2900.17
GB4858
GB4207
GB4988
GB6994
GB7094
GB7261
Basic test methods for low-voltage electrical appliances
Basic standards for low-voltage electrical appliances
Basic environmental test procedures for electric and electronic products Test A: Low temperature test method Basic environmental test procedures for electric and electronic products Test B: High temperature test method Basic environmental test procedures for electric and electronic products Test Db: Alternating damp heat test method Basic environmental test procedures for electric and electronic products Test: Long test method Basic Environmental test procedures Test Ka: Salt spray test method Electrical terminology Basic terminology
Electrical terminology Relays and relay protection devices Insulation test of electrical relays
Determination method of tracking index and proof tracking index of solid insulating materials under humid conditions Protection level of low-voltage electrical enclosuresbzxZ.net
Rated frequency and rated voltage of electrical products for ships and offshore oil platforms General provisions for ship electrical equipment
Vibration (sinusoidal) test method for ship electrical equipment Basic test method for relays and relay protection devices ZBK33004 General technical conditions for power system protection, automatic relays and devices 3 Terms
In addition to the terminology specified in this standard, the general terminology used in this standard shall comply with the provisions of CB2900.1 and GB2900.17. 3.1 Marine protection relay
Marine protection relay is a measuring relay in the ship's power system. It reflects the abnormal situation of the protected object and acts according to the predetermined requirements to issue an alarm signal or cut off the fault. It can have one or more protection functions. 3.2 Reverse power relay
When the AC generator set draws a certain amount of power from the system, the relay will delay the circuit disconnection. 3.3 Reverse current relay
When the current direction in the DC circuit changes and exceeds the set value, the relay will delay or disconnect the circuit. Approved by the Ministry of Machinery and Electronics Industry on October 17, 1991, and implemented on October 1, 1992
4 Classification
4.1 According to purpose:
4.1.1 Protection of AC generator sets;
4.1.2 Protection of DC generator sets:
4.1.3 Protection of other electrical equipment in the power system. According to the action principle:
JB/T5776—1991
4.2.1 Electromechanical type (e.g. electromagnetic type, induction type, motor, etc.); 4.2.2 Static type (e.g. transistor type, integrated circuit type, etc.). 4.3 According to the installation type:
4.3.1 Protruding type;
4.3.2 Embedded type.
According to the structural type:
4.4.1 Insertion type;
4.4.2 Non-insertion type.
4.5 According to the wiring method:
4.5.1 Front wiring;
4.5.2 Back wiring.
4.6 According to the enclosure protection level:
According to the provisions of Table 5 of Article 5.5 of GB6994.
According to the protection type:
4.7.1 Reverse power
With delay.
Reverse current
Instantaneous;
Delayed.
Undervoltage
Instantaneous;
Delayed.
Overcurrent
4. 7. 4. 1
4. 7. 4. 2
4. 7. 4. 3
Long delay
Inverse time;
Definite time.
Short delay
Inverse time;
Definite time.
Other types are specified by the product technical documents. 5 Technical requirements
5.1 Normal working conditions and installation conditions
5.1.1 Normal working conditions
5.1.1.1 Ambient air temperature
The upper limit of ambient air temperature is +45℃:
JB/T5776-1991
b. The lower limit of ambient air temperature is 0℃ or -25℃ (for open deck). Note: The upper limit of ambient air temperature for static maintenance equipment is shown in Articles 5.1 and 6.1 of this standard. 5.1.1.2 Atmospheric pressure
The atmospheric pressure at the place of use is 80110kPa. 5.1.1.3 Impact of environmental climate
It should withstand the impact of humid air, salt spray, shock and oil mist at sea. 5.1.1.4 Impact of environmental mechanical forces
It should withstand the impact of tilting, swaying and shock and vibration of no more than 22.5° in all directions from the installation position and the impact of normal ship operation. 5.1.1.5 The pollution degree of the relay is 3. 5.1.1.6 The installation category (overvoltage category) of the relay is or class. 5.1.1.7 Voltage variation
The variation of the power supply voltage is +6% to -10% of the rated voltage. 5.1.1.8 Frequency variation
The variation of the power supply frequency is ±5% of the rated frequency. Installation conditions
Normal installation conditions should be in accordance with the manufacturer's installation and use instructions3. 5.2 Rated values
5.2.1 Rated voltage and rated frequency
The rated voltage and rated frequency of the relay can be selected according to the provisions of Table 1. Table 1
Current types
The voltage values in brackets are not recommended for use.
5.2.2 Rated insulation voltage
(24), (36), 110, 220, 660
100, 380
24, (36), 110, 220
The rated insulation voltage of one or all circuits of the relay shall be selected from the following values: 30, 60, 127, 250, 380, 500, 660, 750V. 5.2.3 Rated current
shall comply with the provisions of GB4988.
5.2.4 Rated working system
shall be continuous working system.
5.3 Performance Overview
The performance of a relay can be described by the following items: relay type (see 4.7);
Rated value of the relay (see 5.2);
Operating characteristics of the relay (see 5.4); Time characteristics of the relay (see 5.5); Contact performance (see 5.6).
5.4 Operating characteristics
Rated frequency
50 or 60
5.4.1 Action value
5.4.1.1 The action value shall be the set value.
5.4.1.2 Action value range
JB/T5776—1991
5.4.1.2.1 The setting value of the reverse power and reverse current relays is 2%-15% of the rated value. When the power supply voltage drops to 50% of the rated voltage, the reverse power and reverse current protection should not fail, but its action value may change. 5.4.1.2.2 Undervoltage protection
When the voltage drops, or even slowly drops to 70%-35% of its rated voltage, it should act. Its actionability should ensure that it remains effective when the power supply frequency drops significantly.
Undervoltage is a special form of undervoltage, and the action voltage of undervoltage protection should be within the range of 35%-10% of the rated voltage. 5.4.1.2.3 Overcurrent protection
Overcurrent protection, it can be long delay, short delay, instantaneous, or any combination of them. The setting range of overcurrent protection can be selected according to Table 2, or it can be specified in the product technical documents. Table 2
Rated current multiple
2~4 or 1~3
5.4.1.2.4 The action value range of other protections is specified in the technical documents of the relevant products. 5.4.2 Return (reset) coefficient
3~7, 5~10 or 8~20
5.4.2.1 The return coefficient of reverse power, reverse current and overcurrent relays shall not be less than 0.8 or as specified in the product technical documents. 5.4.2.2 The return coefficient of the undervoltage relay shall not be greater than 1.25 or as specified in the product technical documents. 5.4.3 Consistency of action value
The consistency of action under reference conditions is the algebraic difference between the maximum action value and the minimum action value measured 10 times. For static relays, the consistency of action value can be determined by 5 measurements. The specific requirements for consistency are specified in the product technical documents. 5.4.4 Accuracy of action value
The accuracy of the action value determined under reference conditions. The average error of the action value shall be less than or equal to the given error value. The given error expressed as a percentage shall be specified in the product technical documents. Its value is recommended to be selected from the following values: 0.5, 1.0, 1.5, 2.5, 5.0, 7.5, 10, 20.
5.4.5 Variation of action value
The variation of action value caused by any influencing quantity or influencing factor (such as temperature, frequency, etc.) changing between the limit values of its nominal range shall be less than or equal to the given value. During the test, all influencing quantities and influencing factors are under reference conditions except for the influencing quantity or influencing factor whose variation is being determined by the macro. The variation caused by a certain influencing quantity or influencing factor shall be specified in the product technical documentation. The specified variation expressed as a percentage is recommended to be selected from the following values: 0.5, 1.0, 1.5, 2.5, 5.0, 7.5, 10, 20. 5.5 Time characteristics
5.5.1 Consistency of time limit
Under reference conditions, the consistency of the time limit is the difference between the maximum delay and the minimum delay of 10 measurements. For static relays, the consistency of the time limit can be determined by 5 measurements.
The specific requirements for consistency are specified in the product technical documentation. 5.5.2 Accuracy of time limit
The accuracy of the time limit is determined under reference conditions. The mean error of the time limit shall be less than or equal to the given error value. The given error expressed as a percentage shall be specified in the product technical documents. Its value is recommended to be selected from the following values: 0.5, 1.0, 1.5.2.5, 5.0, 7.5, 10, 20
5.5.3 Variation of time limit
The test conditions and methods are the same as those in Article 5.4.5,
JB/T57761991
5.5.3.1 For relays with time limit, the variation due to a certain influencing quantity or influencing factor shall be specified in the product technical documents. The specified variation expressed as a percentage is recommended to be selected from the following values: 0.5, 1.0, 1.5, 2.5, 5.0, 7.5, 10, 20. 5.5.3.2 If necessary, the product technical documents shall specify the value of the increase in time limit consistency caused by the change of a certain influencing quantity or influencing factor.
5.5.4 Return time
Specified in the product technical documents.
5.5.5 Time-current characteristics
The manufacturer must provide the time-current characteristics corresponding to the maximum and minimum setting currents. If the time-current characteristics are adjustable, it is recommended to provide the characteristic curves corresponding to the maximum and minimum setting times. In order to facilitate the coordination of the characteristics of the relay, the time-current characteristics should be expressed in a unified way, with the current on the horizontal axis and the time on the vertical axis. The double logarithmic coordinates are used, with the longer dimension per decade on the horizontal axis and the shorter dimension per decade on the vertical axis, with a ratio of 2:1. The time-current characteristics should be expressed on A3 or A4 standard coordinate paper, and the dimension per decade should be selected from the following preferred values: 28, 56, 112mm. The dimension per decade on the horizontal axis should preferably be 56mm, and the dimension per decade on the vertical axis should preferably be 28mm. The time is expressed in seconds, and the current is expressed in A or multiples of the current. 5.6 Contact performance
5.6.1 Contact connection capacity
Contact connection capacity refers to the current that the contact should connect and carry in a short time. The contact connection capacity is specified in the product technical documents. 5.6.2 The continuous working limit current of the output circuit should be selected from the following values: 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10A. 5.6.3 Contact disconnection capacity
5.6.3.1 The contact of the output circuit should be able to disconnect the DC inductive load circuit with a voltage not greater than 250V and a time constant of 5±0.75ms (or 40±6ms) and the AC circuit with a voltage not greater than 250V (cos4 is 0.4±0.1). The disconnection capacity of the contact and the maximum current allowed to be disconnected are specified in the product technical documents and can generally be selected according to the values listed in Table 3. Table 3
Rated disconnection capacity
Contact category
Maximum current allowed to be disconnected
5.6.3.2 The connection and disconnection capacity of contacts used for AC voltage circuits above 250V shall be specified in the product technical documents. 5.6.4 Limiting connection and disconnection capacity of contacts
The contacts shall be able to reliably connect and disconnect 1.5 times the rated disconnection capacity 10 times. 5.6.5 Contact resistance
Contact resistance may be specified in the product technical documents. 5.6.6 Electrical life
5.6.6.1 For relays with output contacts, the contacts shall close and disconnect the rated disconnection capacity during the electrical life test; for relays without output contacts, the load applied to the output circuit during the electrical life test shall be specified in the product technical documents. 5.6.6.2 Electrical life times
The electrical life times shall be specified in the product technical documents and shall generally be selected from the following values: 5×10°, 10°, 10°, 10. 5.7 Temperature rise
5.7.1 Temperature rise limit
JB/T5776—1991
When the relay is tested under the conditions specified in Article 6.4.1, the measured temperature rise of each component shall not exceed the limit value specified in Table 4. Table 4 Types of components and materials Class A insulating materials Class E insulating materials Class B insulating materials Class F insulating materials Silver or silver inlaid (silver-plated) All other metals or ceramic metals Bare wires (including uninsulated wires) Spring-acting metal parts Metal parts in contact with insulating materials Terminals connected to external insulated conductors Parts that can be touched but not held by hands Limited anti-corrosion layer Tin anti-corrosion layer Metal materials Insulating materials Note: The ambient air temperature is based on 45°C. 5.7.2 Temperature rise of input excitation circuit
Limit allowable temperature rise
Limited to not damage adjacent components
Limited to not cause any damage to adjacent componentsLimited to not damage adjacent components
Limited to not damage material elasticity
Limited to not damage insulating materials
Measurement method
Resistance method
Thermocouple method
Thermocouple method
For voltage input excitation circuit and AC current input excitation circuit, 1.1 times the rated value should be continuously applied or as specified in the product technical documents. For DC current input excitation circuit, the rated value should be continuously applied. The temperature rise shall not exceed the limit value specified in Table 4. For products with two or more excitation quantities, the temperature rise limit of one input excitation circuit is obtained when the rated value is applied to other excitation circuits. 5.7.3 Temperature rise of output circuit
The output circuit contacts pass through their continuous working limit current, and the temperature rise shall not exceed the limit value specified in Table 4. 5.8 Dielectric properties
5.8.1 Rated impulse withstand voltage
The electrical clearance to ground and the electrical clearance between each pole and each circuit shall withstand the highest impulse withstand voltage corresponding to the specified installation category. The solid insulation of the relay related to the electrical clearance shall also withstand this impulse withstand voltage. The impulse withstand voltage value shall be as specified in Table 5.
The relative voltage to ground (AC effective value or DC value) derived from the rated voltage of the system
Impact withstand voltage
U≤50
505 Variation of the action value
The variation of the action value caused by any influencing quantity or influencing factor (such as temperature, frequency, etc.) changing between the limits of its nominal range shall be less than or equal to the given value. When testing, all influencing quantities and influencing factors except the influencing quantity or influencing factor for which the variation is being determined are under reference conditions. The variation caused by a certain influencing quantity or influencing factor shall be specified in the product technical documentation. The specified variation expressed as a percentage is recommended to be selected from the following values: 0.5, 1.0, 1.5, 2.5, 5.0, 7.5, 10, 20. 5.5 Time characteristics
5.5.1 Consistency of time limit
Under reference conditions, the consistency of the time limit is the difference between the maximum delay and the minimum delay of 10 measurements. For static relays, the consistency of the time limit can be determined by 5 measurements.
The specific requirements for consistency are specified in the product technical documentation. 5.5.2 Accuracy of time limit
Determine the accuracy of time limit under reference conditions. The average error of time limit shall be less than or equal to the given error value. The given error expressed as a percentage shall be specified in the product technical documents, and its value is recommended to be selected from the following values: 0.5, 1.0, 1.5.2.5, 5.0, 7.5, 10, 20
5.5.3 Variation of time limit
Test conditions and methods are the same as those in Article 5.4.5,
JB/T57761991
5.5.3.1 For relays with time limit, the variation attributed to a certain influencing quantity or influencing factor shall be specified in the product technical documents. The specified variation expressed as a percentage is recommended to be selected from the following values: 0.5, 1.0, 1.5, 2.5, 5.0, 7.5, 10, 20. 5.5.3.2 If necessary, the product technical documentation shall specify the value of the increase in the consistency of the time limit due to the change of a certain shadow or influencing factor.
5.5.4 The return time
is specified in the product technical documentation.
5.5.5 Time-current characteristics
The manufacturer must provide the time-current characteristics corresponding to the maximum and minimum setting currents. If the time-current characteristics are adjustable, it is recommended to supplement the characteristic curves corresponding to the maximum and minimum setting times. In order to facilitate the coordination of relay characteristics, the time-current characteristics should be expressed in a unified way, with the current on the horizontal axis and the time on the vertical axis. Double logarithmic coordinates are used, with the horizontal axis having a longer dimension per decade and the vertical axis having a shorter dimension per decade, with a ratio of 2:1. The time-current characteristics should be expressed on A3 or A4 standard coordinate paper, and the dimension per decade should be selected from the following preferred values: 28, 56, 112mm. The horizontal axis should preferably use 56mm per decade, and the vertical axis should preferably use 28mm per decade. Time is expressed in seconds, and current is expressed in A or current multiples. 5.6 Contact performance
5.6.1 Contact connection capacity
The contact connection capacity refers to the current that the contact should connect and carry in a short period of time. The contact connection capacity is specified by the product technical documents. 5.6.2 The continuous working limit current of the output circuit shall be selected from the following values: 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10A. 5.6.3 The disconnecting capacity of the contact
5.6.3.1 The contact of the output circuit shall be able to disconnect the DC inductive load circuit with a voltage not greater than 250V and a time constant of 5±0.75ms (or 40±6ms) and the AC circuit with a voltage not greater than 250V (cos4 is 0.4±0.1). The disconnecting capacity of the contact and the maximum current allowed to be disconnected shall be specified in the product technical documents, and can generally be selected according to the values listed in Table 3. Table 3
Rated disconnecting capacity
Contact category
Maximum current allowed to be disconnected
5.6.3.2 The connection and disconnection capacity of the contact for the AC voltage circuit above 250V shall be specified in the product technical documents. 5.6.4 Limiting breaking capacity of contacts
Contacts should be able to reliably connect and disconnect 1.5 times the rated breaking capacity 10 times. 5.6.5 Contact resistance
Contact resistance may be specified in the product technical documents. 5.6.6 Electrical life
5.6.6.1 For relays with output contacts, the contacts should close and disconnect the rated breaking capacity during the electrical life test; for relays without output contacts, the load applied to the output circuit during the electrical life test shall be specified in the product technical documents. 5.6.6.2 Electrical life times
The electrical life times shall be specified in the product technical documents and shall generally be selected from the following values: 5×10°, 10°, 10°, 10. 5.7 Temperature rise
5.7.1 Temperature rise limit
JB/T5776—1991
When the relay is tested under the conditions specified in Article 6.4.1, the measured temperature rise of each component shall not exceed the limit value specified in Table 4. Table 4 Types of components and materials Class A insulating materials Class E insulating materials Class B insulating materials Class F insulating materials Silver or silver inlaid (silver-plated) All other metals or ceramic metals Bare wires (including uninsulated wires) Spring-acting metal parts Metal parts in contact with insulating materials Terminals connected to external insulated conductors Parts that can be touched but not held by hands Limited anti-corrosion layer Tin anti-corrosion layer Metal materials Insulating materials Note: The ambient air temperature is based on 45°C. 5.7.2 Temperature rise of input excitation circuit
Limit allowable temperature rise
Limited to not damage adjacent components
Limited to not cause any damage to adjacent componentsLimited to not damage adjacent components
Limited to not damage material elasticity
Limited to not damage insulating materials
Measurement method
Resistance method
Thermocouple method
Thermocouple method
For voltage input excitation circuit and AC current input excitation circuit, 1.1 times the rated value should be continuously applied or as specified in the product technical documents. For DC current input excitation circuit, the rated value should be continuously applied. The temperature rise shall not exceed the limit value specified in Table 4. For products with two or more excitation quantities, the temperature rise limit of one input excitation circuit is obtained when the rated value is applied to other excitation circuits. 5.7.3 Temperature rise of output circuit
The output circuit contacts pass through their continuous working limit current, and the temperature rise shall not exceed the limit value specified in Table 4. 5.8 Dielectric properties
5.8.1 Rated impulse withstand voltage
The electrical clearance to ground and the electrical clearance between each pole and each circuit shall withstand the highest impulse withstand voltage corresponding to the specified installation category. The solid insulation of the relay related to the electrical clearance shall also withstand this impulse withstand voltage. The impulse withstand voltage value shall be as specified in Table 5.
The relative voltage to ground (AC effective value or DC value) derived from the rated voltage of the system
Impact withstand voltage
U≤50
505 Variation of the action value
The variation of the action value caused by any influencing quantity or influencing factor (such as temperature, frequency, etc.) changing between the limits of its nominal range shall be less than or equal to the given value. When testing, all influencing quantities and influencing factors except the influencing quantity or influencing factor for which the variation is being determined are under reference conditions. The variation caused by a certain influencing quantity or influencing factor shall be specified in the product technical documentation. The specified variation expressed as a percentage is recommended to be selected from the following values: 0.5, 1.0, 1.5, 2.5, 5.0, 7.5, 10, 20. 5.5 Time characteristics
5.5.1 Consistency of time limit
Under reference conditions, the consistency of the time limit is the difference between the maximum delay and the minimum delay of 10 measurements. For static relays, the consistency of the time limit can be determined by 5 measurements.
The specific requirements for consistency are specified in the product technical documentation. 5.5.2 Accuracy of time limit
Determine the accuracy of time limit under reference conditions. The average error of time limit shall be less than or equal to the given error value. The given error expressed as a percentage shall be specified in the product technical documents, and its value is recommended to be selected from the following values: 0.5, 1.0, 1.5.2.5, 5.0, 7.5, 10, 20
5.5.3 Variation of time limit
Test conditions and methods are the same as those in Article 5.4.5,
JB/T57761991
5.5.3.1 For relays with time limit, the variation attributed to a certain influencing quantity or influencing factor shall be specified in the product technical documents. The specified variation expressed as a percentage is recommended to be selected from the following values: 0.5, 1.0, 1.5, 2.5, 5.0, 7.5, 10, 20. 5.5.3.2 If necessary, the product technical documentation shall specify the value of the increase in the consistency of the time limit due to the change of a certain shadow or influencing factor.
5.5.4 The return time
is specified in the product technical documentation.
5.5.5 Time-current characteristics
The manufacturer must provide the time-current characteristics corresponding to the maximum and minimum setting currents. If the time-current characteristics are adjustable, it is recommended to supplement the characteristic curves corresponding to the maximum and minimum setting times. In order to facilitate the coordination of relay characteristics, the time-current characteristics should be expressed in a unified way, with the current on the horizontal axis and the time on the vertical axis. Double logarithmic coordinates are used, with the horizontal axis having a longer dimension per decade and the vertical axis having a shorter dimension per decade, with a ratio of 2:1. The time-current characteristics should be expressed on A3 or A4 standard coordinate paper, and the dimension per decade should be selected from the following preferred values: 28, 56, 112mm. The horizontal axis should preferably use 56mm per decade, and the vertical axis should preferably use 28mm per decade. Time is expressed in seconds, and current is expressed in A or current multiples. 5.6 Contact performance
5.6.1 Contact connection capacity
The contact connection capacity refers to the current that the contact should connect and carry in a short period of time. The contact connection capacity is specified by the product technical documents. 5.6.2 The continuous working limit current of the output circuit shall be selected from the following values: 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10A. 5.6.3 The disconnecting capacity of the contact
5.6.3.1 The contact of the output circuit shall be able to disconnect the DC inductive load circuit with a voltage not greater than 250V and a time constant of 5±0.75ms (or 40±6ms) and the AC circuit with a voltage not greater than 250V (cos4 is 0.4±0.1). The disconnecting capacity of the contact and the maximum current allowed to be disconnected shall be specified in the product technical documents, and can generally be selected according to the values listed in Table 3. Table 3
Rated disconnecting capacity
Contact category
Maximum current allowed to be disconnected
5.6.3.2 The connection and disconnection capacity of the contact for the AC voltage circuit above 250V shall be specified in the product technical documents. 5.6.4 Limiting breaking capacity of contacts
Contacts should be able to reliably connect and disconnect 1.5 times the rated breaking capacity 10 times. 5.6.5 Contact resistance
Contact resistance may be specified in the product technical documents. 5.6.6 Electrical life
5.6.6.1 For relays with output contacts, the contacts should close and disconnect the rated breaking capacity during the electrical life test; for relays without output contacts, the load applied to the output circuit during the electrical life test shall be specified in the product technical documents. 5.6.6.2 Electrical life times
The electrical life times shall be specified in the product technical documents and shall generally be selected from the following values: 5×10°, 10°, 10°, 10. 5.7 Temperature rise
5.7.1 Temperature rise limit
JB/T5776—1991
When the relay is tested under the conditions specified in Article 6.4.1, the measured temperature rise of each component shall not exceed the limit value specified in Table 4. Table 4 Types of components and materials Class A insulating materials Class E insulating materials Class B insulating materials Class F insulating materials Silver or silver inlaid (silver-plated) All other metals or ceramic metals Bare wires (including uninsulated wires) Spring-acting metal parts Metal parts in contact with insulating materials Terminals connected to external insulated conductors Parts that can be touched but not held by hands Limited anti-corrosion layer Tin anti-corrosion layer Metal materials Insulating materials Note: The ambient air temperature is based on 45°C. 5.7.2 Temperature rise of input excitation circuit
Limit allowable temperature rise
Limited to not damage adjacent components
Limited to not cause any damage to adjacent componentsLimited to not damage adjacent components
Limited to not damage material elasticity
Limited to not damage insulating materials
Measurement method
Resistance method
Thermocouple method
Thermocouple method
For voltage input excitation circuit and AC current input excitation circuit, 1.1 times the rated value should be continuously applied or as specified in the product technical documents. For DC current input excitation circuit, the rated value should be continuously applied. The temperature rise shall not exceed the limit value specified in Table 4. For products with two or more excitation quantities, the temperature rise limit of one input excitation circuit is obtained when the rated value is applied to other excitation circuits. 5.7.3 Temperature rise of output circuit
The output circuit contacts pass through their continuous working limit current, and the temperature rise shall not exceed the limit value specified in Table 4. 5.8 Dielectric properties
5.8.1 Rated impulse withstand voltage
The electrical clearance to ground and the electrical clearance between each pole and each circuit shall withstand the highest impulse withstand voltage corresponding to the specified installation category. The solid insulation of the relay related to the electrical clearance shall also withstand this impulse withstand voltage. The impulse withstand voltage value shall be as specified in Table 5.
The relative voltage to ground (AC effective value or DC value) derived from the rated voltage of the system
Impact withstand voltage
U≤50
502 If necessary, the product technical documentation shall specify the value of the increase in the consistency of the time limit due to the change of a certain shadow or influencing factor.
5.5.4 Return time
Specified in the product technical documentation.
5.5.5 Time-current characteristics
The manufacturer must provide the time-current characteristics corresponding to the maximum and minimum setting currents. If the time-current characteristics are adjustable, it is recommended to supplement the characteristic curves corresponding to the maximum and minimum setting times. In order to facilitate the coordination of the characteristics of the relay, its time-current characteristics should be expressed in a unified way, with the current using the horizontal coordinate and the time using the vertical coordinate, using double logarithmic coordinates, with the horizontal coordinate having a longer dimension per decade and the vertical coordinate having a shorter dimension per decade, with a ratio of 2:1. The time-current characteristics should be expressed on A3 or A4 standard coordinate paper, and the dimension per decade should be selected from the following preferred values: 28, 56, 112mm. The horizontal axis should preferably use 56mm per decade, and the vertical axis should preferably use 28mm per decade. Time is expressed in seconds, and current is expressed in A or current multiples. 5.6 Contact performance
5.6.1 Contact connection capacity
Contact connection capacity refers to the current that the contact should connect and carry in a short time. The contact connection capacity is specified in the product technical documents. 5.6.2 The continuous working limit current of the output circuit should be selected from the following values: 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10A. 5.6.3 Breaking capacity of contacts
5.6.3.1 The contacts of the output circuit should be able to break the DC inductive load circuit with a voltage not greater than 250V and a time constant of 5±0.75ms (or 40±6ms) and the AC circuit with a voltage not greater than 250V (cos4 is 0.4±0.1). The breaking capacity of the contacts and the maximum current allowed to be broken shall be specified in the product technical documents, and can generally be selected according to the values listed in Table 3. Table 3
Rated breaking capacity
Contact category
Maximum current allowed to be broken
5.6.3.2 The connection and disconnection capacity of the contacts used for AC voltage circuits above 250V shall be specified in the product technical documents. 5.6.4 Limiting breaking capacity of contacts
The contacts should be able to reliably connect and disconnect 1.5 times the rated breaking capacity 10 times. 5.6.5 Contact resistance
Contact resistance can be specified in the product technical documents. 5.6.6 Electrical life
5.6.6.1 For relays with output contacts, the contacts shall close and open the rated disconnect capacity during the electrical life test; for relays without output contacts, the load applied to the output circuit during the electrical life test shall be specified in the product technical documents. 5.6.6.2 Electrical life times
The electrical life times shall be specified in the product technical documents and shall generally be selected from the following values: 5×10°, 10°, 10°, 10. 5.7 Temperature rise
5.7.1 Temperature rise limit
JB/T5776—1991
When the relay is tested under the conditions specified in Article 6.4.1, the measured temperature rise of each component shall not exceed the limit value specified in Table 4. Table 4 Types of components and materials Class A insulating materials Class E insulating materials Class B insulating materials Class F insulating materials Silver or silver inlaid (silver-plated) All other metals or ceramic metals Bare wires (including uninsulated wires) Spring-acting metal parts Metal parts in contact with insulating materials Terminals connected to external insulated conductors Parts that can be touched but not held by hands Limited anti-corrosion layer Tin anti-corrosion layer Metal materials Insulating materials Note: The ambient air temperature is based on 45°C. 5.7.2 Temperature rise of input excitation circuit
Limit allowable temperature rise
Limited to not damage adjacent components
Limited to not cause any damage to adjacent componentsLimited to not damage adjacent components
Limited to not damage material elasticity
Limited to not damage insulating materials
Measurement method
Resistance method
Thermocouple method
Thermocouple method
For voltage input excitation circuit and AC current input excitation circuit, 1.1 times the rated value should be continuously applied or as specified in the product technical documents. For DC current input excitation circuit, the rated value should be continuously applied. The temperature rise shall not exceed the limit value specified in Table 4. For products with two or more excitation quantities, the temperature rise limit of one input excitation circuit is obtained when the rated value is applied to other excitation circuits. 5.7.3 Temperature rise of output circuit
The output circuit contacts pass through their continuous working limit current, and the temperature rise shall not exceed the limit value specified in Table 4. 5.8 Dielectric properties
5.8.1 Rated impulse withstand voltage
The electrical clearance to ground and the electrical clearance between each pole and each circuit shall withstand the highest impulse withstand voltage corresponding to the specified installation category. The solid insulation of the relay related to the electrical clearance shall also withstand this impulse withstand voltage. The impulse withstand voltage value shall be as specified in Table 5.
The relative voltage to ground (AC effective value or DC value) derived from the rated voltage of the system
Impact withstand voltage
U≤50
502 If necessary, the product technical documentation shall specify the value of the increase in the consistency of the time limit due to the change of a certain shadow or influencing factor.
5.5.4 Return time
Specified in the product technical documentation.
5.5.5 Time-current characteristics
The manufacturer must provide the time-current characteristics corresponding to the maximum and minimum setting currents. If the time-current characteristics are adjustable, it is recommended to supplement the characteristic curves corresponding to the maximum and minimum setting times. In order to facilitate the coordination of the characteristics of the relay, its time-current characteristics should be expressed in a unified way, with the current using the horizontal coordinate and the time using the vertical coordinate, using double logarithmic coordinates, with the horizontal coordinate having a longer dimension per decade and the vertical coordinate having a shorter dimension per decade, with a ratio of 2:1. The time-current characteristics should be expressed on A3 or A4 standard coordinate paper, and the dimension per decade should be selected from the following preferred values: 28, 56, 112mm. The horizontal axis should preferably use 56mm per decade, and the vertical axis should preferably use 28mm per decade. Time is expressed in seconds, and current is expressed in A or current multiples. 5.6 Contact performance
5.6.1 Contact connection capacity
Contact connection capacity refers to the current that the contact should connect and carry in a short time. The contact connection capacity is specified in the product technical documents. 5.6.2 The continuous working limit current of the output circuit should be selected from the following values: 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10A. 5.6.3 Breaking capacity of contacts
5.6.3.1 The contacts of the output circuit should be able to break the DC inductive load circuit with a voltage not greater than 250V and a time constant of 5±0.75ms (or 40±6ms) and the AC circuit with a voltage not greater than 250V (cos4 is 0.4±0.1). The breaking capacity of the contacts and the maximum current allowed to be broken shall be specified in the product technical documents, and can generally be selected according to the values listed in Table 3. Table 3
Rated breaking capacity
Contact category
Maximum current allowed to be broken
5.6.3.2 The connection and disconnection capacity of the contacts used for AC voltage circuits above 250V shall be specified in the product technical documents. 5.6.4 Limiting breaking capacity of contacts
The contacts should be able to reliably connect and disconnect 1.5 times the rated breaking capacity 10 times. 5.6.5 Contact resistance
Contact resistance can be specified in the product technical documents. 5.6.6 Electrical life
5.6.6.1 For relays with output contacts, the contacts shall close and open the rated disconnect capacity during the electrical life test; for relays without output contacts, the load applied to the output circuit during the electrical life test shall be specified in the product technical documents. 5.6.6.2 Electrical life times
The electrical life times shall be specified in the product technical documents and shall generally be selected from the following values: 5×10°, 10°, 10°, 10. 5.7 Temperature rise
5.7.1 Temperature rise limit
JB/T5776—1991
When the relay is tested under the conditions specified in Article 6.4.1, the measured temperature rise of each component shall not exceed the limit value specified in Table 4. Table 4 Types of components and materials Class A insulating materials Class E insulating materials Class B insulating materials Class F insulating materials Silver or silver inlaid (silver-plated) All other metals or ceramic metals Bare wires (including uninsulated wires) Spring-acting metal parts Metal parts in contact with insulating materials Terminals connected to external insulated conductors Parts that can be touched but not held by hands Limited anti-corrosion layer Tin anti-corrosion layer Metal materials Insulating materials Note: The ambient air temperature is based on 45°C. 5.7.2 Temperature rise of input excitation circuit
Limit allowable temperature rise
Limited to not damage adjacent components
Limited to not cause any damage to adjacent componentsLimited to not damage adjacent components
Limited to not damage material elasticity
Limited to not damage insulating materials
Measurement method
Resistance method
Thermocouple method
Thermocouple method
For voltage input excitation circuit and AC current input excitation circuit, 1.1 times the rated value should be continuously applied or as specified in the product technical documents. For DC current input excitation circuit, the rated value should be continuously applied. The temperature rise shall not exceed the limit value specified in Table 4. For products with two or more excitation quantities, the temperature rise limit of one input excitation circuit is obtained when the rated value is applied to other excitation circuits. 5.7.3 Temperature rise of output circuit
The output circuit contacts pass through their continuous working limit current, and the temperature rise shall not exceed the limit value specified in Table 4. 5.8 Dielectric properties
5.8.1 Rated impulse withstand voltage
The electrical clearance to ground and the electrical clearance between each pole and each circuit shall withstand the highest impulse withstand voltage corresponding to the specified installation category. The solid insulation of the relay related to the electrical clearance shall also withstand this impulse withstand voltage. The impulse withstand voltage value shall be as specified in Table 5.
The relative voltage to ground (AC effective value or DC value) derived from the rated voltage of the system
Impact withstand voltage
U≤50
501, the measured temperature rise of each component shall not exceed the limit value specified in Table 4. Table 4
Components and
Material Types
A-grade insulating materials
E-grade insulating materials
B-grade insulating materials
F-grade insulating materials
Silver or silver-plated (silver-plated)
All other metals or ceramic metals
Wire conductors (including uninsulated wire beds)
Spring-acting metal parts
Metal parts in contact with insulating materials
Terminals connected to external insulated conductors
Parts that can be touched by hands but not held
Limited anti-corrosion layer
Tin anti-corrosion layer
Metal materials
Insulation materials
Note: The ambient air temperature is based on 45°C. 5.7.2 Temperature rise of input excitation circuit
Limit allowable temperature rise
Limited to not damage adjacent components
Limited to not cause any damage to adjacent componentsLimited to not damage adjacent components
Limited to not damage material elasticity
Limited to not damage insulating materials
Measurement method
Resistance method
Thermocouple method
Thermocouple method
For voltage input excitation circuit and AC current input excitation circuit, 1.1 times the rated value should be continuously applied or as specified in the product technical documents. For DC current input excitation circuit, the rated value should be continuously applied. The temperature rise shall not exceed the limit value specified in Table 4. For products with two or more excitation quantities, the temperature rise limit of one input excitation circuit is obtained when the rated value is applied to other excitation circuits. 5.7.3 Temperature rise of output circuit
The output circuit contacts pass through their continuous working limit current, and the temperature rise shall not exceed the limit value specified in Table 4. 5.8 Dielectric properties
5.8.1 Rated impulse withstand voltage
The electrical clearance to ground and the electrical clearance between each pole and each circuit shall withstand the highest impulse withstand voltage corresponding to the specified installation category. The solid insulation of the relay related to the electrical clearance shall also withstand this impulse withstand voltage. The impulse withstand voltage value shall be as specified in Table 5.
The relative voltage to ground (AC effective value or DC value) derived from the rated voltage of the system
Impact withstand voltage
U≤50
501, the measured temperature rise of each component shall not exceed the limit value specified in Table 4. Table 4
Components and
Material Types
A-grade insulating materials
E-grade insulating materials
B-grade insulating materials
F-grade insulating materials
Silver or silver-plated (silver-plated)
All other metals or ceramic metals
Wire conductors (including uninsulated wire beds)
Spring-acting metal parts
Metal parts in contact with insulating materials
Terminals connected to external insulated conductors
Parts that can be touched by hands but not held
Limited anti-corrosion layer
Tin anti-corrosion layer
Metal materials
Insulation materials
Note: The ambient air temperature is based on 45°C. 5.7.2 Temperature rise of input excitation circuit
Limit allowable temperature rise
Limited to not damage adjacent components
Limited to not cause any damage to adjacent componentsLimited to not damage adjacent components
Limited to not damage material elasticity
Limited to not damage insulating materials
Measurement method
Resistance method
Thermocouple method
Thermocouple method
For voltage input excitation circuit and AC current input excitation circuit, 1.1 times the rated value should be continuously applied or as specified in the product technical documents. For DC current input excitation circuit, the rated value should be continuously applied. The temperature rise shall not exceed the limit value specified in Table 4. For products with two or more excitation quantities, the temperature rise limit of one input excitation circuit is obtained when the rated value is applied to other excitation circuits. 5.7.3 Temperature rise of output circuit
The output circuit contacts pass through their continuous working limit current, and the temperature rise shall not exceed the limit value specified in Table 4. 5.8 Dielectric properties
5.8.1 Rated impulse withstand voltage
The electrical clearance to ground and the electrical clearance between each pole and each circuit shall withstand the highest impulse withstand voltage corresponding to the specified installation category. The solid insulation of the relay related to the electrical clearance shall also withstand this impulse withstand voltage. The impulse withstand voltage value shall be as specified in Table 5.
The relative voltage to ground (AC effective value or DC value) derived from the rated voltage of the system
Impact withstand voltage
U≤50
50
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