A test method for the insulation dielectric strength of special vehicles

Abstract

The present invention provides a method for testing the insulation dielectric strength of special vehicles, including testing the insulation resistance of the DC electrical circuit, testing the withstand voltage of the DC electrical circuit, testing the insulation resistance of the AC electrical circuit, and testing the withstand voltage of the AC electrical circuit. This method is simple to operate and has good implementation effects, and can perform insulation dielectric strength testing on vehicle circuits after loading to ensure the safety and stability of all electrical circuits of the vehicle.

Description

Technical Field

[0001] The present invention belongs to the technical field of special vehicle performance testing, and particularly relates to a method for testing the insulation dielectric strength of special vehicles. Background Art

[0002] For ordinary vehicles, it is required that the insulation and withstand voltage performance of the vehicle wiring harness can meet the relevant insulation and withstand voltage requirements in "GB / T 25085-2010 Road Vehicles - Single-core Cables with Voltages up to 60 V and 600 V". However, due to the intricate electrical circuits and a wide variety of access devices in special vehicles, including high and low voltage circuits, if the wiring harness is damaged during the vehicle loading process or there is interference between electrical equipment, it will cause the wiring harness to be unable to withstand the sudden high voltage of the equipment, resulting in local electrical circuit breakdown or arcing, which will endanger personal safety. Therefore, it is still necessary to conduct insulation dielectric strength testing on the vehicle circuits after loading to ensure the safety and stability of all electrical circuits of the vehicle. The safety of electronic equipment in special vehicles is an important factor determining its quality. Therefore, it is necessary to design a method for testing the insulation dielectric strength of special vehicles to make up for the deficiencies of the existing technology. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] The present invention provides a method for testing the insulation dielectric strength of special vehicles to solve the technical problem of how to test the insulation dielectric strength of special vehicle circuits after loading.

[0005] (2) Technical Solutions

[0006] To solve the above technical problems, the present invention provides a method for testing the insulation dielectric strength of special vehicles, which includes the following steps:

[0007] S1. Insulation Resistance Test of DC Electrical Circuits

[0008] Select the left and right outdoor lamp wiring harness circuits of the vehicle for insulation resistance testing; during the test, disconnect the lines corresponding to the left and right outdoor lamps, set the insulation resistance tester to the 250 V voltage range, connect the red test lead of the insulation resistance tester to the left lamp, and the black test lead to the frame ground bolt to measure the insulation resistance; then connect the black test lead to the right lamp to measure the insulation resistance, and determine whether both measurements can meet the requirement of not less than 2 MΩ.

[0009] S2. Withstand Voltage Test of DC Electrical Circuits

[0010] Disconnect the circuits corresponding to the left and right outdoor lights, and reliably ground the withstand voltage tester; Lead a wire from the high-voltage output terminal of the withstand voltage tester to the electrical circuit under test; Among them, for the withstand voltage test of the electrical circuit to the ground, connect the red test lead of the withstand voltage tester to the left light, and connect the black test lead to the frame ground bolt; For the withstand voltage test between electrical circuits, connect the red test lead to the left light, and connect the black test lead to the right light, and the wire harness of the circuit under test is in a conductive state; Turn on the power supply and start from no more than half of the test voltage value, and increase it evenly to the full value; After the full value voltage lasts for a period of time, start to decrease the voltage, and cut off the power supply after the voltage drops to one-third of the full value; Respectively test whether breakdown or flashover occurs when the DC circuit is under voltage to the ground and between circuits; Ground the high-voltage lead of the withstand voltage tester to discharge the circuit under test to the ground.

[0011] S3. Insulation Resistance Test of AC Electrical Circuit

[0012] Select the measurement of the mains power supply circuit to the ground, the generator power supply circuit to the ground, and the mains power supply circuit to the generator power supply circuit; Set the insulation resistance tester to the 250V voltage range, short-circuit the L and N terminals of the mains AC socket, connect the red test lead of the insulation resistance tester to the L / N terminal, connect the black test lead to the ground terminal, and measure the insulation resistance; Then short-circuit the X and Y terminals of the generator socket, connect the red test lead to the X / Y terminal, connect the black test lead to the W terminal of the generator socket, measure the insulation resistance, and finally connect the red test lead to the L / N terminal of the mains AC socket, connect the black test lead to the X / Y terminal of the generator AC socket, measure the insulation resistance, and judge whether all three measurements can meet the requirement of not less than 2MΩ.

[0013] S4. Withstand Voltage Test of AC Electrical Circuit

[0014] Disconnect the mains power supply socket and the generator power supply socket; Reliably ground the withstand voltage tester; Lead a wire from the high-voltage output terminal of the withstand voltage tester to the electrical circuit under test; Among them, for the withstand voltage test of the electrical circuit to the ground, for the mains power supply circuit to the ground, connect the red test lead of the withstand voltage tester to the L terminal of the mains AC socket, and connect the black test lead to the ground wire terminal; For the withstand voltage test between electrical circuits, for the mains power supply circuit to the generator power supply circuit, connect the red test lead to the L / N terminal of the mains socket, and connect the black test lead to the X / Y terminal of the generator power supply socket, and the wire harness of the circuit under test is in a conductive state; Turn on the power supply and start from no more than half of the test voltage value, and increase it evenly to the full value; After the full value voltage lasts for a period of time, start to decrease the voltage, and cut off the power supply after the voltage drops to one-third of the full value; Respectively test whether breakdown or flashover occurs when the AC circuit is under voltage to the ground and between circuits; Ground the high-voltage lead of the withstand voltage tester to discharge the circuit under test to the ground.

[0015] Furthermore, in steps S2 and S4, the test voltage is 750V and 50Hz.

[0016] Further, in steps S2 and S4, the time for the voltage to increase from half value to full value is not less than 10 s; after the full value voltage lasts for 1 min, the voltage starts to decrease, and the power supply is cut off after the voltage drops to one-third of the full value.

[0017] (III) Beneficial effects

[0018] The present invention provides a method for testing the insulation dielectric strength of special vehicles, including testing the insulation resistance of DC electrical circuits, testing the withstand voltage of DC electrical circuits, testing the insulation resistance of AC electrical circuits, and testing the withstand voltage of AC electrical circuits. This method is simple to operate and has good implementation effects, and can test the insulation dielectric strength of vehicle circuits after loading to ensure the safety and stability of all electrical circuits of the vehicle. Description of the drawings

[0019] Figure 1a It is a schematic diagram of the principle of the electrical circuit to the ground in the insulation resistance test of the DC electrical circuit according to the embodiment of the present invention. Figure 1b It is a schematic diagram of the principle between electrical circuits.

[0020] Figure 2a It is a schematic diagram of the principle of the electrical circuit to the ground in the insulation resistance test of the AC electrical circuit according to the embodiment of the present invention. Figure 2b It is a schematic diagram of the principle between electrical circuits. Specific embodiments

[0021] To make the objectives, contents, and advantages of the present invention clearer, the following further describes the specific embodiments of the present invention in detail with reference to the drawings and embodiments.

[0022] This embodiment provides a method for testing the insulation dielectric strength of special vehicles. In the special vehicle targeted in this embodiment, a five-row rocker switch is used to connect between the vehicle power supply and the vehicle lamp in its DC electrical circuit. This test method specifically includes the following steps:

[0023] S1. Insulation resistance test of DC electrical circuits

[0024] Select the left and right outdoor lamp wire harness circuits of the vehicle for insulation resistance testing. During the test, disconnect the lines A03 and A04 corresponding to the left and right outdoor lamps in the five-row rocker switch, set the insulation resistance tester to the 250 V voltage range, connect the red test lead of the insulation resistance tester to A03, and connect the black test lead to the frame ground bolt. At this time, the insulation resistance tester shows that the insulation resistance > 275 MΩ; then connect the black test lead to A04. At this time, the insulation resistance tester shows that the insulation resistance > 275 MΩ. Both tests meet the requirement that the cold-state insulation resistance between the independent electrical circuit and the ground and between the circuits in the performance index of "GJB1777-93 General Specification for Military Special Purpose Vehicles" is not less than 2 MΩ.

[0025] S2. DC Electrical Circuit Withstand Voltage Test

[0026] For each independent electrical circuit in special vehicles to the ground and between circuits, when the rated voltage of the circuit is less than 100V, the test voltage it should be able to withstand is 750V; when the rated voltage of the circuit is 100 - 400V, the test voltage it should be able to withstand is (1000 + 2 times the rated voltage of the circuit) × 80%, with a minimum of 1200V. Among them, the test voltage frequency is 50Hz, the waveform is an actual sine wave, and there should be no breakdown or flashover phenomenon during the 1-minute insulation dielectric strength test.

[0027] As shown in Figure 1, when conducting the DC electrical circuit withstand voltage test, remove the left and right outdoor lamp wire harness interfaces, disconnect the lines A03 and A04 corresponding to the left and right outdoor lamps in the five - row rocker switch; reliably ground the withstand voltage tester; lead a wire from the high - voltage output terminal of the withstand voltage tester to the electrical circuit to be tested. Among them, for the withstand voltage test of the electrical circuit to the ground, connect the red test lead of the withstand voltage tester to A03 and the black test lead to the frame ground bolt; for the withstand voltage test between electrical circuits, connect the red test lead to A03 and the black test lead to A04, and the wire harness of the circuit to be tested is in a conducting state; according to the relevant requirements of "GJB1777 - 93 General Specification for Military Special Purpose Vehicles", turn on the power and start from not exceeding half of the test voltage (750V, 50Hz), and increase evenly to the full value. The time for the voltage to increase from half value to full value is not less than 10s; after the full - value voltage lasts for 1 minute, start to decrease the voltage. After the voltage drops to one - third of the full value, cut off the power; respectively test whether there is breakdown or arcing when the DC circuit is pressurized to the ground and between circuits for 1 minute; ground the high - voltage lead of the withstand voltage tester to discharge the circuit to be tested to the ground.

[0028] S3. AC Electrical Circuit Insulation Resistance Test

[0029] Select to measure the insulation resistance of the mains power supply circuit to the ground, the generator power supply circuit to the ground, and the mains power supply circuit to the generator power supply circuit. Set the insulation resistance tester to the 250V voltage range, short - circuit the L and N terminals of the mains AC socket, connect the red test lead of the insulation resistance tester to the L / N terminal, and the black test lead to the ground terminal. At this time, the insulation resistance tester shows that the insulation resistance > 2.2GΩ. Then short - circuit the X and Y terminals of the generator socket, connect the red test lead to the X / Y terminal, and the black test lead to the W terminal of the generator socket. At this time, the insulation resistance tester shows that the insulation resistance > 2.2GΩ. Finally, connect the red test lead to the L / N terminal of the mains AC socket and the black test lead to the X / Y terminal of the generator AC socket. At this time, the insulation resistance tester shows that the insulation resistance > 2.2GΩ. All three tests meet the requirement of not less than 2MΩ in "GJB1777 - 93 General Specification for Military Special Purpose Vehicles".

[0030] S4. AC Electrical Circuit Withstand Voltage Test

[0031] Disconnect the mains power supply socket and the generator power supply socket; reliably ground the withstand voltage tester; lead a wire from the high-voltage output terminal of the withstand voltage tester to the electrical circuit under test. Among them, for the withstand voltage test of the electrical circuit to the ground, for the mains power supply circuit to the ground, connect the red test lead of the withstand voltage tester to the L terminal of the mains AC socket, and connect the black test lead to the ground wire terminal; for the withstand voltage test between electrical circuits, for the mains power supply circuit to the generator power supply circuit, connect the red test lead to the L / N terminal of the mains socket, and connect the black test lead to the X / Y terminal of the generator power supply socket, and the measured circuit wire harness is in a conducting state; according to the relevant requirements of "GJB1777-93 General Specification for Military Special Purpose Vehicles", turn on the power and start from not exceeding half of the test voltage (1200V, 50Hz), and increase it uniformly to the full value. The time for the voltage to increase from half value to full value is not less than 10s; after the full value voltage lasts for 1 minute, start to reduce the voltage, and cut off the power supply after the voltage drops to one-third of the full value; respectively test whether breakdown or arcing occurs when the AC circuit is pressurized to the ground and between circuits for 1 minute; ground the high-voltage lead of the withstand voltage tester to discharge the circuit under test to the ground.

[0032] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A test method for the insulation dielectric strength of special vehicles, characterized in that, The test method includes the following steps: S1. Insulation resistance test of DC electrical circuit Select the left and right outdoor lamp wire harness circuits of the vehicle for insulation resistance test; during the test, disconnect the lines corresponding to the left and right outdoor lamps, set the insulation resistance tester to the 250V voltage range, connect the red test lead of the insulation resistance tester to the left lamp, and the black test lead to the frame ground bolt to measure the insulation resistance; then connect the black test lead to the right lamp to measure the insulation resistance, and judge whether both measurements can meet the requirement of not less than 2MΩ. S2. Withstand voltage test of DC electrical circuit Disconnect the lines corresponding to the left and right outdoor lamps, and reliably ground the withstand voltage tester; lead a wire from the high-voltage output terminal of the withstand voltage tester to the electrical circuit to be tested; among them, for the withstand voltage test of the electrical circuit to the ground, connect the red test lead of the withstand voltage tester to the left lamp, and the black test lead to the frame ground bolt; for the withstand voltage test between electrical circuits, connect the red test lead to the left lamp, and the black test lead to the right lamp, and the wire harness of the circuit to be tested is in a conducting state; turn on the power supply and start from not more than half of the test voltage value, and uniformly increase to the full value; after the full value voltage lasts for a period of time, start to decrease the voltage, and cut off the power supply after the voltage drops to one-third of the full value; respectively test whether breakdown or flashover occurs when the DC circuit is pressurized to the ground and between circuits; ground the high-voltage lead of the withstand voltage tester to discharge the circuit to be tested to the ground. S3. Insulation resistance test of AC electrical circuit Measure the insulation resistance of the mains power supply circuit to the ground, the generator power supply circuit to the ground, and the mains power supply circuit to the generator power supply circuit; set the insulation resistance tester to the 250V voltage range, short-circuit the L and N terminals of the mains AC socket, connect the red test lead of the insulation resistance tester to the L / N terminal, and the black test lead to the ground terminal to measure the insulation resistance; then short-circuit the X and Y terminals of the generator socket, connect the red test lead to the X / Y terminal, and the black test lead to the W terminal of the generator socket to measure the insulation resistance. Finally, connect the red test lead to the L / N terminal of the mains AC socket, and the black test lead to the X / Y terminal of the generator AC socket to measure the insulation resistance, and judge whether all three measurements can meet the requirement of not less than 2MΩ. S4. Withstand voltage test of AC electrical circuit Disconnect the mains power supply socket and the generator power supply socket; reliably ground the withstand voltage tester; lead a wire from the high-voltage output terminal of the withstand voltage tester to the electrical circuit to be tested; among them, for the withstand voltage test of the electrical circuit to the ground, for the mains power supply circuit to the ground, connect the red test lead of the withstand voltage tester to the L terminal of the mains AC socket, and the black test lead to the ground terminal; for the withstand voltage test between electrical circuits, for the mains power supply circuit to the generator power supply circuit, connect the red test lead to the L / N terminal of the mains socket, and the black test lead to the X / Y terminal of the generator power supply socket, and the wire harness of the circuit to be tested is in a conducting state; turn on the power supply and start from not more than half of the test voltage value, and uniformly increase to the full value; after the full value voltage lasts for a period of time, start to decrease the voltage, and cut off the power supply after the voltage drops to one-third of the full value; respectively test whether breakdown or flashover occurs when the AC circuit is pressurized to the ground and between circuits; ground the high-voltage lead of the withstand voltage tester to discharge the circuit to be tested to the ground.

2. The test method according to claim 1, characterized in that, In steps S2 and S4, the test voltage is 750V and 50Hz.

3. The test method according to claim 1, characterized in that, In steps S2 and S4, the time for the voltage to increase from half value to full value is not less than 10s; after the full value voltage lasts for 1 minute, the voltage starts to decrease, and the power supply is cut off after the voltage drops to one-third of the full value.

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