This standard specifies the product classification, technical requirements, test method inspection rules for generator rotor grounding protection devices. This standard applies to generator rotor grounding protection devices (hereinafter referred to as protection devices) that monitor the insulation of the generator rotor circuit to the ground. JB/T 5780-1991 Technical conditions for generator rotor grounding protection devices JB/T5780-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Generator Rotor Grounding Protection Device Subject Content and Scope of Application
JB5780-91
This standard specifies the product classification, technical requirements, test methods and inspection rules for generator rotor grounding protection devices. This standard applies to generator rotor grounding protection devices (hereinafter referred to as protection devices) that monitor the insulation of the generator rotor circuit to the ground. 2 Reference Standards
GB2423.4 Basic Environmental Test Procedures for Electrical and Electronic Products Test Db: Alternating Damp Heat Test Method GB4858
Insulation Test of Electrical Relays
GB7261
3 Product Classification
3.1 Type and Classification
Basic Test Methods for Relays and Relay Protection Devices According to the principle of construction: electromechanical type, rectifier type, anti-static type, b. According to the external wiring method: front wiring, rear wiring; According to the installation method: occupied type, embedded type; c.
d. According to the structural type: non-insertion type, insertion type. 3.2 Rated parameters
AC voltage: 100, 220V
b Frequency: 50Hz
C, DC voltage: 48, 110, 220V
3.3 Model and meaning
Specified by the lower-level standard.
3.4 ​​Variety specifications
Specified by the lower-level standard according to the specific parameters and specific uses of the product. 3.5 External installation dimensions and terminal diagram
Specified by the lower-level standard.
3.6 Weight
Specified by the lower-level standard.
4 Technical requirements
4.1 General requirements
The protective device shall comply with the provisions of this standard and shall be manufactured in accordance with the drawings and technical documents approved and signed in accordance with the prescribed procedures. In addition to complying with the provisions of this standard, the tropical type protective device shall also comply with the technical requirements for tropical protective devices. 4.2 Influence disk and influence factors Standard conditions Reference values ​​The reference values ​​and test deviations of influence quantities and influence factors are shown in Table 1. Ministry of Machinery and Electronics Industry
Approved on October 17, 1991
Implementation on October 1, 1992
Influence quantities and influence factorsbZxz.net
DC component in AC (steady state)
AC component in DC (steady state)
Nominal range limit values ​​of influence quantities and influence factors JB5780-91
Reference value
Vertical to the installation vertical plane
Sine wave
Nominal range limit values ​​of influence quantities and influence factors are shown in Table 2. Table
DC component in AC (steady state)
AC component in DC (steady state)
Variation range of auxiliary excitation
4.4 Other requirements for the place of use
Other requirements for the place of use are as follows: 2
Test deviation
-20%, +10%
Inclination in any direction shall not exceed 2°
Any height of 9.5
Not more than ±0.5%
Distortion factor shall not exceed 5%
Not more than 2% of the peak value
Not more than 2%|| tt||Specified in the lower level standard or selected from the following values ​​-10~50 (55), -25～40
80~106
The average maximum relative humidity of the wettest month is 90% and the average minimum temperature of the month is 25°C. Deviating from the reference position in any direction by 5°
Not more than ±2% of the rated value
Not more than 5% of the peak value
Specified by the lower level standard
80%~110% of the rated value
JB5780-91
a. The use location is not allowed to have vibration and impact of level 2 or above. b. The use location shall not have explosive media, and the surrounding medium shall not have gases and conductive media that corrode metals and destroy insulation. It is not allowed to be filled with water vapor and have serious mold. c. The use location should have facilities to protect against rain, snow, wind and sand. d. The use location is not allowed to have an external magnetic induction intensity of more than 0.5mT. 4.5 Influence and influencing factors Extreme range limit values ​​The extreme range values ​​of temperature are ~25℃ and 70℃. 4.6 Rotor single-point grounding parameters
4.6.1 Setting range
4.6.1.1 Action current setting range
Specified by the lower standard.
4.6.1.2 Action resistance setting range
Specified by the lower standard.
4.6.1.3 Action time setting range
Specified by the lower standard.
4.6.2 Return coefficient
Specified by the lower standard.
4.6.8 Capacitance influence
Specified by the lower standard.
4.7 Rotor two-point grounding parameters
4.7.1 Minimum action voltage
Specified by the lower standard.
4.7.2 Filtering characteristics
Specified by the lower standard.
4.7.3. Sensitivity
When the excitation voltage is 220V (applied to the external resistor and the 1002 rotor simulation resistor), assuming that the first grounding point is in the middle of the rotor, when the rotor simulation resistance on either side of the first grounding decreases by 5%, the protection device should operate reliably. 4.8 Thermal performance
When the ambient temperature is 40, 50, 55℃, the voltage working winding in the protection device should be able to withstand 1.1 times the rated value for a long time, and the coil temperature rise is not more than 65, 55, 50℃ respectively.
4.9 Contact capacity
In a DC inductive load circuit with a voltage not greater than 250V, a current not greater than 0.3A, and a time constant not greater than 5±0.75ms, the contact disconnection capacity is 20W, 50W, or specified by the lower standard. 4.10 Insulation performance
4.10.1 Insulation resistance
The insulation resistance between each conductive circuit of the protective device and the ground (i.e. the metal casing or exposed non-live metal parts), and between each conductive circuit in the protective device without electrical connection, measured with a test instrument with an open circuit voltage of 500V, shall not be less than 100M2. 4.10.2 Dielectric strength
The insulation resistance between each conductive circuit of the protective device and the ground (i.e. the metal casing or exposed non-live metal parts), and between each conductive circuit in the protective device without electrical connection, shall be able to withstand a 50Hz1750V test voltage and a dielectric strength test lasting 1min without insulation breakdown or flashover.
Impact voltage
It shall be specified by the lower-level standard.
4.11 Resistance to moisture and heat
JB5780-91
The protection device is subjected to an alternating damp heat test under the conditions of a maximum temperature of 40°C and a test cycle of two cycles (48h). Within 2h before the end of the test, the insulation resistance value of the parts specified in Article 4.10.1 of this standard shall be measured with a test instrument with an open circuit voltage of 500V, and shall not be less than 1.5MQ. The dielectric strength between the AC circuit and the ground (metal casing or exposed non-live metal parts) shall not be less than 75% of the test voltage specified in Article 4.10.2.
4.12 Power consumption
Specified by the lower-level standard.
4.13 Life
4.13.1 Mechanical life
The output contact circuit of the protection device shall be able to complete 1C* action without load. Special requirements shall be specified by the lower-level standard. For static, rectifier type protection devices with output relays, if the output relays have been tested and proved to meet the mechanical life requirements, the mechanical thermal life test of the replacement device is not required: 4.13.2 Electrical life
The shaft output contact circuit of the protection device should be able to complete 10° actions with rated load. Special requirements shall be specified by the lower-level standards. For static, rectifier type protection devices with output relays, if the output relays have been tested and proved to meet the electrical life requirements, the electrical life test of the device may not be performed.
4.13.8 Core reduction rate
3600 times/h
4.14 Ability to withstand high electrical interference
Static type protection devices should be able to withstand the test voltage of the first half-wave amplitude of the attenuated oscillation wave with a frequency of 1MHz and 100kHz, the common mode is 2.5kV, and the differential mode is 1kV. The protection device should not malfunction or refuse to operate. 4.15 Reliability
Specified by the lower-level standards.
4.16 Vibration and shock
Specified by the lower-level standard.
4.17 Structural and appearance requirements
Specified by the lower-level standard.
5 Test method
5.1 Test conditions
Should comply with the relevant provisions of Chapter 3 of GB7261. 5.2 Structural and appearance inspection
Should comply with the provisions of Chapter 4 of GB72G1.
5.3 Section 1.5. The test of the extreme range limit value of the influencing quantity and influencing factor shall be carried out in accordance with the provisions of Chapter 22 of GB7261. The qualified criterion is: a. The parts and components shall not undergo irreversible changes, b. The main performance of the protection device shall comply with the relevant provisions of this standard. 5.4 The determination of the setting range of Article 4.6.1 and the return coefficient (rotor one-point grounding) of Article 4.6.2 of this standard shall be carried out in accordance with the method specified in Chapter 7 of GB7261.
5.5 The test method and qualified criterion of Article 4.6.3 of this standard for the influence of capacitance shall be specified by the lower-level standards. 33
JB5780-91
5.6. The determination of Article 4.7.1 of this standard for the minimum operating voltage and Article 4.7.3 of this standard for the sensitivity (rotor two-point grounding) shall be carried out in accordance with the method specified in Chapter 7 of GB7261.
5.7 The test method and qualification criteria for filtering characteristics in Article 4.7.2 of this standard shall be specified by the lower-level standards. 5.8 The determination of thermal performance in Article 4.8 of this standard shall be carried out in accordance with the provisions of Chapter 11 of GB7261. 5.9 The determination of contact capacity in Article 4.9 of this standard shall be carried out in accordance with the provisions of Chapter 24 of GB7261. 5.10 The determination of insulation performance in Article 4.10 of this standard shall be carried out in accordance with the provisions of Chapter 20 of GB7261. 5.11 The determination of moisture and heat resistance in Article 4.11 of this standard shall be carried out in accordance with the provisions of Chapter 21 of GB7261. 5.12 The determination of power consumption in Article 4.12 of this standard shall be carried out in accordance with the provisions of Chapter 10 of GB7261. 5.13 The determination of mechanical life in Article 4.13.1 of this standard shall be carried out in accordance with the provisions of Chapter 25 of GB7261. 5.14 The determination of electrical life in Article 4.13.2 of this standard shall be carried out in accordance with the provisions of Chapter 24 of GB7261. 5.15 The determination of the ability to withstand high-frequency electrical interference in Article 4.14 of this standard shall be carried out in accordance with the provisions of Chapter 19 of GB7261. 5.16 The determination of reliability index in Article 4.15 of this standard shall be carried out by a testing agency designated by the state or relevant departments, which shall issue a reliability test report (valid for two years) and make a reliability index assessment. 5.17
The determination of vibration and impact performance in Article 4.16 of this standard shall be carried out in accordance with the provisions of Chapters 16 and 17 of GB7261. 6 Inspection rules
Specified by lower-level standards.
Additional notes:
This standard was proposed and managed by the Xuchang Relay Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by Acheng Relay Factory. The main drafters of this standard were Li Yinfa and Li Bingzhu. 34
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