CN106405409B - Intelligent test system and test method for insulation resistance and leakage current of high-voltage circuit breaker - Google Patents

Abstract

The intelligent test system and method for the insulation resistance and leakage current of the high-voltage circuit breaker are characterized in that: the system comprises a power supply (1), a self-coupling voltage regulator (3), a test transformer (4), a first protection resistor (5), a high-voltage rectifying silicon stack (6), a first filter capacitor (7), a voltage dividing resistor (8), a pressure measuring resistor (9), a voltage transformer (10), a high-voltage circuit breaker (11), a battery (12), a second filter capacitor (13), a second protection resistor (14), a current transformer (15), a signal processing circuit (16), a DSP (17), a signal amplifying circuit (18), a display screen (19), an indicator lamp (20), a buzzer (21), an operation panel (22), a printer module (23), a grounding terminal (24), a step-up transformer (25), a control switch (26), a switch driver (27), a signal processing circuit (28) and a signal conversion circuit (29), and the system has the advantages of being simple in structure, convenient to operate, short in response time, high in test precision and the like, and provides a data base for evaluating the insulation state and fault diagnosis of the high-voltage circuit breaker.

Description

High-voltage circuit breaker insulation resistance and leakage current intelligent testing system and testing method

Technical field

The invention belongs to the technical field of insulation characteristic testing, and particularly relates to an intelligent testing system for high-voltage circuit breaker insulation resistance and leakage current.

Background technique

Insulation testing refers to using special instruments and methods to test the insulation characteristics of high-voltage circuit breakers. Insulation resistance and leakage current testing are important items for testing the insulation characteristics of high-voltage circuit breakers. Testing the insulation resistance and leakage current can reflect the insulation status of the high-voltage circuit breaker, and effectively detect moisture in the entire insulation and inertia, insulation breakdown and overheating aging, moisture in the insulating tie rod and insulating oil, moisture and deterioration of the arc extinguishing chamber, and cracks and appearance of the porcelain sleeve. Contamination and other faults, through the data accumulated in previous tests, a comprehensive analysis of the changing trend of the insulation characteristics over time can be carried out to improve the judgment of the insulation status of the high-voltage circuit breaker. At present, high-voltage circuit breaker insulation resistance and leakage tests use megohmmeters, ammeters and other equipment, and rely on manual reading and recording of data. The test process is complex, reliability is poor, and the level of intelligence is low.

Contents of the invention

Purpose of the invention: The invention provides an intelligent testing system and testing method for high-voltage circuit breaker insulation resistance and leakage current, with the purpose of solving the problems that existed in the past.

Technical solution: The invention is realized through the following technical solution:

High-voltage circuit breaker insulation resistance and leakage current intelligent testing system. The system includes power supply, low-voltage contactor, self-coupling voltage regulator, test transformer, first protection resistor, high-voltage rectifier silicon stack, first filter capacitor, voltage dividing resistor, measuring Piezoresistor, voltage transformer, high-voltage circuit breaker, battery, second filter capacitor, second protection resistor, current transformer, signal processing circuit, DSP, signal amplifier circuit, display screen, indicator light, buzzer, operation panel, Printer module, ground terminal, step-up transformer, control switch, switch driver, signal processing circuit and signal conversion circuit. The positive and negative ends of the power supply are connected to the power input side of the auto-coupling voltage regulator through a low-voltage contactor. The output end of the transformer is connected to the primary side of the test transformer, one end of the secondary side of the test transformer is connected to the primary side of the first protection resistor, the other end of the secondary side of the test transformer is connected to the ground terminal, and the first The other primary side of the protection resistor is connected to one end of the high-voltage rectifier silicon stack, and the other end of the high-voltage rectifier silicon stack is connected to one end of the voltage dividing resistor, one end of the first filter capacitor, and one side of the test port of the high-voltage circuit breaker. The other side of the circuit breaker test port is connected to the ground terminal after passing through the current transformer. The other end of the first filter capacitor is connected to the ground terminal. The other end of the voltage dividing resistor is connected to one end of the voltage measuring resistor. The voltage measuring resistor The other end of the voltage transformer is connected to the ground terminal, the two ends of the voltage transformer are connected to the two ends of the voltage measuring resistor, the signal output end of the voltage transformer is connected to the signal input end of the DSP through the signal processing circuit, and the output end of the battery is connected to the The input end of the step-up transformer is connected, the output end of the step-up transformer is connected to one end of the second filter capacitor and one end of the control switch, and the other end of the control switch is connected to one side of the test port of the high-voltage circuit breaker through the second protection resistor. connection, the other end of the second filter capacitor is connected to the ground terminal, the signal output end of the current transformer is connected to the analog signal input end of the DSP through the signal processing circuit, and the DSP digital signal output port is connected to the low-voltage contactor through the signal amplification circuit The control port is connected, the signal input unit of the display screen and the indicator light is connected to the signal output unit of the DSP, the DSP digital signal output port is connected to the signal input port of the buzzer after passing through the signal conversion circuit, and the output end of the operation panel Connected to the DSP digital signal output port, the signal input terminal of the printer module is connected to the data communication terminal of the DSP, and the DSP digital signal output port is connected to the control terminal of the control switch after passing through the switch driver.

The display screen is temporarily fixed through a horizontal temporary fixing frame. The fixing frame includes a support box, an upper V-shaped support card, a lower V-shaped support card and an adjustment screw; a limit slide is set at both ends of the support box, and the limit slide is along the support. Strip slides set along the length of the box;

The upper V-shaped support card includes an upper clamping arm and an upper following arm. The upper clamping arm and the upper following arm are connected through a torsion spring to form a V-shaped structure; the lower V-shaped support card includes a lower clamping arm and a lower following arm. The lower clamping arm The lower follower arm is connected to the lower follower arm through another torsion spring to form a V-shaped structure; the two torsion springs are sleeved on the moving drum. There is a rolling shaft in the center of the moving drum. Both ends of the rolling shaft extend into the limit slide and are in use. when moving along the limit slide;

The upper follower arm and the lower follower arm are movably connected through a movable shaft. The movable shaft is connected to a threaded pulling rod. The pulling rod passes through the support box in a direction perpendicular to the limit slide and matches with the support box thread through threads;

A transverse fixed pressing piece for pressing the lower edge of the display screen in the horizontal direction is provided at the front of the upper clamping arm;

A plurality of limiting grooves for inserting the transverse bars of the transverse fixing pressing pieces are provided on the upper clamping arm along the length direction of the upper clamping arm.

The high-voltage circuit breaker insulation resistance and leakage current intelligent testing method implemented by the above-mentioned high-voltage circuit breaker insulation resistance and leakage current intelligent testing system is characterized in that: the method system uses the high-speed data processing and computing capabilities of DSP to achieve Accurately test the insulation resistance and leakage current of the high-voltage circuit breaker. At the same time, the DSP can determine the insulation status of the equipment by calling internal data, and perform hierarchical early warning when the equipment fails. When the high-voltage circuit breaker is operating normally, the indicator light is always bright green and the buzzer sounds. The indicator light does not alarm; when the high-voltage circuit breaker is in a sub-healthy state, the indicator light turns red and flashes, and the buzzer does not alarm; when the high-voltage circuit breaker fails, the indicator light turns red and flashes, the buzzer alarms, and the display and printer modules realize the test results respectively. display and print functions, the specific process is as follows:

(1) When the system is powered on, the DSP performs self-test and waits for control instructions from the operation panel;

(2) Set test parameters and test types, send control instructions, and DSP sends driving instructions to the signal amplification circuit or switch driver;

(3) The low-voltage contactor or control switch is closed, and the voltage is applied to the high-voltage circuit breaker after voltage regulation, current limiting and filtering;

(4) DSP collects system voltage and current information, performs test timing, and uses internal software programs to perform calculations to obtain insulation resistance or leakage current values;

(5) Based on the test location and voltage level of the high-voltage circuit breaker, determine whether the test results are reasonable, and provide hierarchical early warning when the high-voltage circuit breaker fails;

(6) DSP sends signals to the display screen and printer module to display and print test results;

(7) After the test is completed, the high-voltage circuit breaker is restored and the test equipment is sorted out.

Advantages and effects: The present invention provides an intelligent testing system and testing method for the insulation resistance and leakage current of a high-voltage circuit breaker. Its purpose is to solve the problems that existed in the past. The system can accurately test the insulation resistance and leakage current values of the high-voltage circuit breaker and It can realize data display, storage and printing, and can perform different types of sound and light alarms according to the type of fault. It has the advantages of simple structure, convenient operation, short response time, and high test accuracy. It provides data for evaluating the insulation status and fault diagnosis of high-voltage circuit breakers. Base.

Description of drawings

Figure 1 Structural diagram of the intelligent testing system for high-voltage circuit breaker insulation resistance and leakage current;

Figure 2 is a schematic diagram of the mechanism of the fixed frame;

Figure 3 is an enlarged view of part A in Figure 2.

1. Power supply; 2. Low-voltage contactor; 3. Self-coupling voltage regulator; 4. Test transformer; 5. First protection resistor; 6. High-voltage rectifier silicon stack; 7. First filter capacitor; 8. Voltage dividing resistor; 9. Voltage measuring resistor; 10. Voltage transformer; 11. High voltage circuit breaker; 12. Battery; 13. Second filter capacitor; 14. Second protection resistor; 15. Current transformer; 16. Signal processing circuit; 17. DSP; 18. Signal amplifier circuit; 19. Display screen; 20. Indicator light; 21. Buzzer; 22. Operation panel; 23. Printer module; 24. Ground terminal; 25. Step-up transformer; 26. Control switch; 26. Switch driver; 27. Signal conversion circuit; 28. Signal processing circuit.

Detailed ways

As shown in Figure 1, the present invention provides an intelligent testing system for high-voltage circuit breaker insulation resistance and leakage current. The system includes a power supply 1, a low-voltage contactor 2, an auto-coupling voltage regulator 3, a test transformer 4, and a first protection resistor 5. , high voltage rectifier silicon stack 6, first filter capacitor 7, voltage dividing resistor 8, voltage measuring resistor 9, voltage transformer 10, high voltage circuit breaker 11, battery 12, second filter capacitor 13, second protection resistor 14, current transformer 15, signal processing circuit 16, DSP17, signal amplifier circuit 18, display screen 19, indicator light 20, buzzer 21, operation panel 22, printer module 23, ground terminal 24, step-up transformer 25, control switch 26, switch Driver 27, signal processing circuit 28 and signal conversion circuit 29, in which the positive and negative terminals of power supply 1 are connected to the power input side of auto-coupling voltage regulator 3 through low-voltage contactor 2, and the output terminal of auto-coupling voltage regulator 3 is connected to the test The primary side of the transformer 4 is connected, one end of the secondary side of the test transformer 4 is connected to the primary side of the first protection resistor 5, the other end of the secondary side of the test transformer 4 is connected to the ground terminal 24, and the first protection resistor The other primary side of 5 is connected to one end of the high-voltage rectifier silicon stack 6, and the other end of the high-voltage rectifier silicon stack 6 is respectively connected to one end of the voltage dividing resistor 8, one end of the first filter capacitor 7 and one side of the test port of the high-voltage circuit breaker 11 The other side of the test port of the high-voltage circuit breaker 11 is connected to the ground terminal 24 after passing through the current transformer 15. The other end of the first filter capacitor 7 is connected to the ground terminal 24, and the other end of the voltage dividing resistor 8 is connected to the test port. One end of the piezoresistor 9 is connected, the other end of the voltage measuring resistor 9 is connected to the ground terminal 24, both ends of the voltage transformer 10 are connected to both ends of the voltage measuring resistor 9, and the signal output end of the voltage transformer 10 passes through the signal The processing circuit 28 is connected to the signal input end of the DSP 17, the output end of the battery 12 is connected to the input end of the step-up transformer 25, and the output end of the step-up transformer 25 is connected to one end of the second filter capacitor 13 and one end of the control switch 26 respectively. connection, the other end of the control switch 25 is connected to the test port side of the high-voltage circuit breaker 11 through the second protection resistor 14, the other end of the second filter capacitor 13 is connected to the ground terminal 24, and the signal output end of the current transformer 15 The signal processing circuit 16 is connected to the analog signal input end of the DSP17. The digital signal output port of the DSP17 is connected to the control port of the low-voltage contactor 2 through the signal amplification circuit 18. The signal input units of the display screen 19 and the indicator light 20 are connected to the DSP17 The signal output unit is connected, the DSP17 digital signal output port is connected to the signal input port of the buzzer 21 after passing through the signal conversion circuit 29, the output end of the operation panel 22 is connected to the DSP17 digital signal output port, and the signal of the printer module 23 The input end is connected to the data communication end of the DSP17, and the digital signal output port of the DSP17 is connected to the control end of the control switch 26 after passing through the switch driver 27 .

The display screen 19 is temporarily fixed by a horizontal temporary fixing frame. The fixing frame includes a support box 111, an upper V-shaped support card, a lower V-shaped support card and an adjustment screw 888; a limit slide 666 is provided at both ends of the support box 111 to limit the position. The slide 666 is a strip slide provided along the length direction of the support box 111;

The upper V-shaped support card includes an upper clamping arm 333 and an upper following arm 333-1. The upper clamping arm 333 and the upper following arm 333-1 are connected by a torsion spring to form a V-shaped structure; the lower V-shaped support card includes a lower clamping arm 222. and the lower following arm 222-1, the lower clamping arm 222 and the lower following arm 222-1 are connected through another torsion spring 444 to form a V-shaped structure; both torsion springs are sleeved on the moving drum, and the center of the moving drum is provided with Rolling shaft 555, both ends of the rolling shaft 555 extend into the limit slide 666 and move along the limit slide 666 when in use;

The upper following arm 333-1 and the lower following arm 222-1 are movably connected through a movable shaft 777. The movable shaft 777 is connected to a pulling rod 888 with a thread 999. The pulling rod 888 passes through in a direction perpendicular to the limiting slide 666. The support box 111 is threadedly matched with the support box 111 through the thread 999;

A transverse fixing pressing piece 000 for pressing the lower edge of the display screen in the horizontal direction is provided at the front of the upper clamping arm 333 .

A plurality of limiting grooves 001 for inserting the crossbars of the transverse fixing pressing piece 000 are sequentially provided on the upper clamping arm 333 along the length direction of the upper clamping arm.

When using the fixed frame, twist the pulling rod 888 inward (that is, the upper right direction in the figure) so that the upper clamping arm 333 and the lower clamping arm 222 open outward, and then move the upper clamping arm 333 and the lower clamping arm 222 outward. The arms 222 are respectively placed on the side surface and the lower surface of the clamped position, place the display inside the vertical fixed pressing piece 000, and then rotate the lever 888 in the opposite direction, so that the upper clamping arm 333 and the lower clamping arm 222 are drawn inward. And gradually clamp the display screen so that the display screen is in close contact with the clamped position to complete the operation. When removing or replacing the display screen, repeat the action of twisting the pull rod 888. Using this fixing bracket, the display screen can be fixed in many positions to adapt to different usage environments.

The arrangement of multiple limiting grooves 001 can adjust the position of the transverse fixed pressing piece 000, so that it has better adaptability and can adjust the position according to different conditions.

This system uses the high-speed data processing and computing capabilities of DSP to achieve accurate testing of the insulation resistance and leakage current of high-voltage circuit breakers. At the same time, DSP can determine the insulation status of the equipment by calling internal data, and perform hierarchical early warning when equipment fails (high-voltage circuit breakers When the operation is normal, the indicator light is always green and the buzzer does not alarm; when the high-voltage circuit breaker is in a sub-healthy state, the indicator light turns red and flashes and the buzzer does not alarm; when the high-voltage circuit breaker fails, the indicator light turns red and flashes and the buzzer does not alarm. Buzzer alarm), the display screen and printer module realize the display and printing functions of test results respectively. Description of the intelligent testing process for high-voltage circuit breaker insulation resistance and leakage current:

(1) When the system is powered on, the DSP performs self-test and waits for control instructions from the operation panel;

(2) Set test parameters and test types, send control instructions, and DSP sends driving instructions to the signal amplification circuit or switch driver;

(3) The low-voltage contactor or control switch is closed, and the voltage is applied to the high-voltage circuit breaker after voltage regulation, current limiting and filtering;

(4) DSP collects system voltage and current information, performs test timing, and uses internal software programs to perform calculations to obtain insulation resistance or leakage current values;

(5) Based on the test location and voltage level of the high-voltage circuit breaker, determine whether the test results are reasonable, and provide hierarchical early warning when the high-voltage circuit breaker fails;

(6) DSP sends signals to the display screen and printer module to display and print test results;

(7) After the test is completed, the high-voltage circuit breaker is restored and the test equipment is sorted out.

Claims (4)

1. Intelligent testing system for high-voltage circuit breaker insulation resistance and leakage current, which is characterized by: the system includes a power supply (1), a low-voltage contactor (2), an auto-coupling voltage regulator (3), a test transformer (4), and a first Protection resistor (5), high voltage rectifier silicon stack (6), first filter capacitor (7), voltage dividing resistor (8), voltage measuring resistor (9), voltage transformer (10), high voltage circuit breaker (11), Battery (12), second filter capacitor (13), second protection resistor (14), current transformer (15), signal processing circuit (16), DSP (17), signal amplification circuit (18), display screen ( 19), indicator light (20), buzzer (21), operation panel (22), printer module (23), ground terminal (24), step-up transformer (25), control switch (26), switch driver ( 27), signal processing circuit (28) and signal conversion circuit (29), in which the positive and negative ends of the power supply (1) are connected to the power input side of the auto-coupling voltage regulator (3) through the low-voltage contactor (2). The output end of the coupling voltage regulator (3) is connected to the primary side of the test transformer (4), and one end of the secondary side of the test transformer (4) is connected to the primary side of the first protection resistor (5). The test transformer (4) The other end of the secondary side of 4) is connected to the ground terminal (24), the other primary side of the first protection resistor (5) is connected to one end of the high-voltage rectifier silicon stack (6), and the high-voltage rectifier silicon stack (6) The other end is connected to one end of the voltage dividing resistor (8), one end of the first filter capacitor (7) and one side of the test port of the high-voltage circuit breaker (11). The other side of the test port of the high-voltage circuit breaker (11) passes through The current transformer (15) is connected to the ground terminal (24), the other end of the first filter capacitor (7) is connected to the ground terminal (24), and the other end of the voltage dividing resistor (8) is connected to the voltage measuring resistor (9). ) is connected to one end of the voltage measuring resistor (9), the other end of the voltage measuring resistor (9) is connected to the ground terminal (24), both ends of the voltage transformer (10) are connected to both ends of the voltage measuring resistor (9), and the voltage transformer ( The signal output end of 10) is connected to the signal input end of the DSP (17) through the signal processing circuit (28), the output end of the battery (12) is connected to the input end of the step-up transformer (25), and the step-up transformer (25) ) The output end is connected to one end of the second filter capacitor (13) and one end of the control switch (26) respectively. The other end of the control switch (26) is tested by the second protection resistor (14) and the high-voltage circuit breaker (11). One side of the port is connected, the other end of the second filter capacitor (13) is connected to the ground terminal (24), and the signal output end of the current transformer (15) passes through the analog signal of the signal processing circuit (16) and the DSP (17) The input end is connected, the digital signal output port of the DSP (17) is connected to the control port of the low-voltage contactor (2) after passing through the signal amplification circuit (18), and the signal input unit of the display screen (19) and the indicator light (20) is connected to the control port of the low-voltage contactor (2). The signal output unit of the DSP (17) is connected. The digital signal output port of the DSP (17) is connected to the signal input port of the buzzer (21) after passing through the signal conversion circuit (29). The output end of the operation panel (22) is connected to the signal input port of the buzzer (21). The digital signal output port of DSP (17) is connected. The signal input end of the printer module (23) is connected with the data communication end of DSP (17). The digital signal output port of DSP (17) passes through the switch driver (27) and is connected to the control switch. The control end of (26) is connected; Multiple limit grooves (001) are arranged to adjust the position of the transverse fixed pressing piece 000. 2. The intelligent testing system for high-voltage circuit breaker insulation resistance and leakage current according to claim 1, characterized in that: the display screen (19) is temporarily fixed by a horizontal temporary fixing frame, and the fixing frame includes a support box (111), an upper V shaped support card, lower V-shaped support card and pulling rod (888); limited slideways (666) are provided at both ends of the support box (111), and the limited slideways (666) are along the length direction of the support box (111) Set of strip slides; The upper V-shaped support card includes an upper clamping arm (333) and an upper following arm (333-1). The upper clamping arm (333) and the upper following arm (333-1) are connected by a torsion spring to form a V-shaped structure; the lower V-shaped support card The support card includes a lower clamping arm (222) and a lower following arm (222-1). The lower clamping arm (222) and the lower following arm (222-1) are connected through another torsion spring (444) to form a V-shaped structure. ; Both torsion springs are sleeved on the moving drum. A rolling shaft (555) is provided in the center of the moving drum. Both ends of the rolling shaft (555) extend into the limit slide (666) and slide along the limit when in use. Tao (666) moves; The upper following arm (333-1) and the lower following arm (222-1) are movably connected through the movable shaft (777). The movable shaft (777) is connected to the pulling rod (888) with thread (999), and the pulling rod (777) 888) passes through the support box (111) in the direction perpendicular to the limiting slide (666) and threads with the support box (111) through the thread (999); A transverse fixed pressing piece (000) for pressing the lower edge of the display screen in the horizontal direction is provided at the front of the upper clamping arm (333). 3. The intelligent testing system for insulation resistance and leakage current of high-voltage circuit breaker according to claim 2, characterized in that: a plurality of horizontal fixing pressures are provided on the upper clamping arm (333) along the length direction of the upper clamping arm. The crossbar of piece (000) is inserted into the limit slot (001). 4. An intelligent testing method for high-voltage circuit breaker insulation resistance and leakage current implemented by the high-voltage circuit breaker insulation resistance and leakage current intelligent testing system according to claim 1, characterized in that: the method utilizes DSP high-speed data processing and The computing power enables accurate testing of the insulation resistance and leakage current of the high-voltage circuit breaker. At the same time, the DSP can determine the insulation status of the equipment by calling internal data, and perform hierarchical early warning when the equipment fails. When the high-voltage circuit breaker is operating normally, the indicator light is always on. Green, the buzzer does not alarm; when the high-voltage circuit breaker is in a sub-healthy state, the indicator light turns red and flashes, and the buzzer does not alarm; when the high-voltage circuit breaker fails, the indicator light turns red and flashes, the buzzer alarms, display screen and printer module The display and printing functions of test results are implemented respectively. The specific process is as follows: (1) When the system is powered on, the DSP performs self-test and waits for control instructions from the operation panel; (2) Set test parameters and test types, send control instructions, and DSP sends driving instructions to the signal amplification circuit or switch driver; (3) The low-voltage contactor or control switch is closed, and the voltage is applied to the high-voltage circuit breaker after voltage regulation, current limiting and filtering; (4) DSP collects system voltage and current information, performs test timing, and uses internal software programs to perform calculations to obtain insulation resistance or leakage current values; (5) Based on the test location and voltage level of the high-voltage circuit breaker, determine whether the test results are reasonable, and provide hierarchical early warning when the high-voltage circuit breaker fails; (6) DSP sends signals to the display screen and printer module to display and print test results; (7) After the test is completed, the high-voltage circuit breaker is restored and the test equipment is sorted out.