CN213633609U - Insulation resistance tester - Google Patents

Abstract

The utility model provides an insulation resistance tester, including base, shell, CPU, memory, keyboard module, display screen, power module, output voltage drive module, current detection module, self-checking module, voltage output interface, shielding port, data IO interface, test wire and electroscope, the shell is installed on the base, CUP, memory, power module, output voltage drive module, current detection module and self-checking module all arrange in the shell. The utility model discloses a substantive effect is: the influence of surface leakage current on a test result is eliminated by additionally arranging the shielding port; an electroscope is additionally arranged, and the technical problem that whether a test article is electrified cannot be judged by an existing insulation resistance tester is solved.

Description

Insulation resistance tester

Technical Field

The utility model belongs to the technical field of insulation detection technique and specifically relates to indicate an insulation resistance tester.

Background

The insulation resistance test is an important index in the safety requirement test of electrical equipment, and is also one of main parameters for effectively judging whether an insulator is complete or not and whether the surface of the insulator is polluted or not.

The existing general insulation resistance tester has larger volume and is inconvenient to carry; when the surface leakage current exists in the test sample, the insulation condition of the test sample cannot be accurately judged; because the kilovolt voltage is required to be applied between the insulating layer of the test sample and the conductor for judging whether the insulation is qualified or not, the test sample needs to be grounded for discharging firstly after the insulation test is finished, the wiring can be removed after the discharge is finished, once the discharge is not complete, the wiring is removed, an electric shock accident is easy to generate, and the technical problem that whether the test sample is electrified or not cannot be judged by the conventional insulation resistance tester exists.

In order to solve the technical problem, publication number CN211402544U discloses an insulation resistance tester, including top cap, fixture block, box, energy storage structure and test instrument, the positive bottom fixed mounting of box has energy storage structure, there is the top cap at the top of box through the hinge mounting, the inside of box is provided with the circuit bin, the top of circuit bin is provided with test instrument, the positive top of test instrument is provided with control button, control button's bottom is provided with network interface, one side of network interface is provided with the extension interface, adjust knob's bottom fixed mounting has data interface, one side of test instrument is provided with the part bin. The small messenger of this test instrument volume can be carried by user's convenience, still can't solve the insulation resistance tester and can't judge whether electrified technical problem of sample.

Disclosure of Invention

The insulation resistance tester aims to solve the technical problem that an existing general insulation resistance tester cannot judge whether a test article is electrified or not and reduce the influence of surface leakage current on a test result. The utility model provides an insulation resistance tester, including base, shell, CPU, memory, keyboard module, display screen, power module, output voltage drive module, current detection module, self-checking module, voltage output interface, data IO interface, test wire and electroscope, the shell is installed on the base, CUP, memory, power module, output voltage drive module, current detection module and self-checking module all arrange in the shell, keyboard module, display screen, voltage output interface and data IO interface are all installed on the shell, the test wire with voltage output interface connection, test wire one end is equipped with the fastener, the electroscope is installed on the fastener, the fastener with the test article is connected, memory, keyboard module, display screen, output voltage drive module, The current detection module, the self-detection module and the data I/O interface are all connected with the CPU, the voltage output interface is connected with the output voltage driving module, and the power supply module supplies power to the rest parts. And the current detection module detects and detects the current in a loop formed by the voltage output port, the test wire and the test sample, and when the current value exceeds a threshold value Z1, the insulation resistance of the test sample is too small, and the insulation is unqualified. The CPU stores the test result in the memory and outputs the test result to the display screen, and the electroscope detects whether the test article is electrified after the test is finished. The user can export the experimental data to the external storage device through the data I/O interface. The self-checking module carries out self-checking on the instrument before the insulation test is carried out, and gives an alarm and stops the test when the instrument has problems.

Preferably, the insulation resistance tester further comprises 4 support legs, and the 4 support legs are respectively arranged at four corners of the lower bottom surface of the base. The feet avoid fouling of the base and facilitate handling of the instrument.

Preferably, the keyboard module comprises a key and a knob. And the user selects the functions of the instrument and sets parameters through the keyboard module. The output voltage, the output mode and the test time can be set, and any voltage can be output in N steps within the range of 25V to 5000V. When a step voltage test is performed, the ideal insulator should have the same resistance value at all voltages, and when the insulator is damaged, it will exhibit a low resistance value at a high test voltage, thereby finding an insulation problem. The step voltage test was performed only when set at 2500V and 5000V, each test time was fixed at 5 minutes, and the voltage was stepped by one fifth per minute, while the insulation resistance values at 5 different voltages were recorded.

Preferably, the device further comprises a shielding port, the shielding port is mounted on the housing, the voltage output interface comprises a positive output interface and a negative output interface, the positive output interface outputs voltage under the control of the CPU, and the negative output interface and the shielding port are both connected with a zero potential point. For the basic insulation test, there was little surface leakage effect measurement and no need to use shielded terminals, where the insulation was clean and had no adverse current path. However, during cable testing, surface leakage paths between the bare cable and the sheath may exist due to the presence of moisture and dirt. It is necessary to eliminate the effect of the resulting leakage current, particularly under high voltage testing. The test wire connected with the positive output interface is connected with the insulation part of the test article, the test wire connected with the negative output interface is connected with the conductor part of the test article, and then a bare wire is tightly wound on the insulation and is connected with the shielding terminal through a third test wire. Since the leakage resistance is connected in parallel with the resistance under test, the use of the shield terminal allows the surface leakage current to be shunted away from the measurement circuit. At this point, the instrument reads out the leakage current of the insulator already removing the effect of the surface leakage current.

Preferably, the electroscope comprises a connecting rod and two metal sheets, one end of the connecting rod is rotatably connected with the conductive part of the wire clamp, and the two metal sheets are rotatably connected with the other end of the connecting rod. The connecting rod can rotate around the conductive part of the wire clamp, so that the position of the connecting rod can be freely adjusted, and the connection of the wire clamp and the test article cannot be limited. When the test article is charged, the two metal sheets will be opened due to the same charge.

Preferably, the test wire rack further comprises a wire rack, the wire rack comprises a base, a telescopic rod and a wire clamping device, the telescopic rod is installed on the base, the wire clamping device is installed on the telescopic rod and used for fixing the test wire, and a groove used for placing a balancing weight is processed on the base. The wire frame is used for supporting the test wire, and when the tested grade is higher, the connection between the wire clamp and the test article or the connection between the test wire and the voltage output port is easy to loose due to the self gravity of the test wire. The preferred solution can solve this problem well.

Preferably, the high-voltage power supply further comprises a high-voltage indicator lamp, wherein the high-voltage indicator lamp is mounted on the shell and is connected with the CPU. After the test starts, the voltage output port outputs very high voltage, and the high-voltage indicator light reminds people of paying attention to safety and avoiding random touch.

The utility model discloses a substantive effect is: the influence of surface leakage current on a test result is eliminated by additionally arranging the shielding port; an electroscope is additionally arranged, and the technical problem that whether a test article is electrified cannot be judged by an existing insulation resistance tester is solved.

Drawings

FIG. 1 is a schematic diagram of the composition of the embodiment.

FIG. 2 is a schematic structural diagram of an embodiment.

FIG. 3 is a diagram illustrating a structure of a wire clamp according to an embodiment.

In the figure: 1. the tester comprises a shell, 2 positive output interfaces, 3 negative output interfaces, 4 high-voltage indicator lamps, 5 test wires, 6 data I/O interfaces, 7 shielding ports, 8 wire clamps, 9 electroscopes, 100 CPUs, 200 memories, 300 keyboard modules, 400 display screens, 500 output voltage driving modules, 600 current detection modules and 700 self-checking modules.

Detailed Description

The invention is further described with reference to the following figures and examples.

In a first embodiment, as shown in fig. 1 or fig. 2, an insulation resistance tester includes a base, a housing 1, a high voltage indicator lamp 4, a CPU100, a memory 200, a keyboard module 300, a display 400, a power module, an output voltage driving module 500, a current detection module 600, a self-test module 700, a voltage output interface, a data I/O interface 6, a test line, and an electroscope 9, where the housing 1 is mounted on the base, the CPU, the memory 200, the power module, the output voltage driving module 500, the current detection module 600, and the self-test module 700 are disposed in the housing 1, the high voltage indicator lamp 4, the keyboard module 300, the display 400, the voltage output interface, and the data I/O interface 6 are mounted on the housing 1, the memory 200, the keyboard module 300, the display 400, the output voltage driving module 500, the current detection module 600, the self-test module 700, and the data I/O interface 6 are connected to the CPU100, the voltage output interface is connected to the output voltage driving module 500, and the power supply module supplies power to the rest of the components. The voltage output interface comprises a positive output interface 2 and a negative output interface 3, the positive output interface 2 outputs voltage under the control of the CPU100, and the negative output interface 3 and the shielding port 7 are both connected with a zero potential point. For the basic insulation test, there was little surface leakage effect measurement and no need to use shielded terminals, where the insulation was clean and had no adverse current path. However, during cable testing, surface leakage paths between the bare cable and the sheath may exist due to the presence of moisture and dirt. It is necessary to eliminate the effect of the resulting leakage current, particularly under high voltage testing. The test wire connected with the positive output interface 2 is connected with the insulation part of the test article, the test wire connected with the negative output interface 3 is connected with the conductor part of the test article, and a bare wire is tightly wound on the insulation and is connected with the shielding terminal through a third test wire. Since the leakage resistance is connected in parallel with the resistance under test, the use of the shield terminal allows the surface leakage current to be shunted away from the measurement circuit. At this point, the instrument reads out the leakage current of the insulator already removing the effect of the surface leakage current.

As shown in fig. 3, the test line 5 is connected with the voltage output interface, one end of the test line 5 is provided with a wire clamp 8, the electroscope 9 is installed on the wire clamp 8, the wire clamp 8 is connected with a test article to be tested, the electroscope 9 comprises a connecting rod and two metal sheets, one end of the connecting rod is rotatably connected with a conductive part of the wire clamp 8, and the two metal sheets are rotatably connected with the other end of the connecting rod.

The use method of the first embodiment is described by taking a cable as a test sample, when the pair of cables of the first embodiment is used for detecting the insulation resistance, the test wire 5 connected with the positive output interface 2 is connected with the insulation sheath of the cable, the test wire 5 connected with the negative output interface 3 is connected with the inner core part of the cable, and a bare wire is tightly wound on the insulation sheath and is connected with the shielding terminal through a third test wire 5. The switch of the first embodiment is turned on, the output voltage is 2500V through the keyboard module 300, the high-voltage indicator lamp 4 is on after the self-test is passed, the test is finished after 60 seconds, the instrument is powered off, at the moment, the test sample is discharged through the grounding wire, the angle between the two thin metal sheets of the electroscope 9 on the wire clamp 8 is observed, if the two thin metal sheets are obviously opened, the incomplete discharge is indicated, the wire can not be disconnected, and the discharge needs to be carried out again. The test results can be read via the display 400 and be derived via the data I/O interface 6.

The above-mentioned embodiments are provided for explaining the present invention, and not for limiting the present invention, and any modifications and changes made by the present invention are within the scope of the present invention.

Claims (7)

1. The utility model provides an insulation resistance tester, can output multistage voltage after the switch is opened and be used for measuring polarization index and the dielectric absorption ratio of sample, its characterized in that: the tester comprises a base, a shell, a CPU, a memory, a keyboard module, a display screen, a power supply module, an output voltage driving module, a current detection module, a self-checking module, a voltage output interface, a data I/O interface, a test line and an electroscope, wherein the shell is arranged on the base, the CPU, the memory, the power supply module, the output voltage driving module, the current detection module and the self-checking module are all arranged in the shell, the keyboard module, the display screen, the voltage output interface and the data I/O interface are all arranged on the shell, the test line is connected with the voltage output interface, one end of the test line is provided with a wire clamp, the electroscope is arranged on the wire clamp, the wire clamp is connected with a test article, and the memory, the keyboard module, the display screen, the output voltage driving module, the current detection module, the self-checking module and the data I/O interface are all connected with the, the voltage output interface is connected with the output voltage driving module, and the power supply module supplies power to the rest parts.

2. The insulation resistance tester as recited in claim 1, wherein: still include 4 stabilizer blades, 4 the stabilizer blade is installed respectively on four angles of bottom surface under the base.

3. The insulation resistance tester as recited in claim 1, wherein: the keyboard module comprises keys and a knob.

4. The insulation resistance tester as recited in claim 1, wherein: the voltage output interface comprises a positive output interface and a negative output interface, the positive output interface outputs voltage under the control of the CPU, and the negative output interface and the shielding port are both connected with a zero potential point.

5. The insulation resistance tester as claimed in claim 1 or 4, wherein: the electroscope includes connecting rod and two metal sheets, connecting rod one end with the electrically conductive part of fastener rotates to be connected, two metal sheets with the other end of connecting rod rotates to be connected.

6. The insulation resistance tester as claimed in claim 1 or 4, wherein: the testing device is characterized by further comprising a wire frame, wherein the wire frame comprises a base, a telescopic rod and a wire clamping device, the telescopic rod is installed on the base, the wire clamping device is installed on the telescopic rod and used for fixing the testing wire, and a groove used for placing a balancing weight is machined in the base.

7. The insulation resistance tester as claimed in claim 1 or 4, wherein: still include high pressure pilot lamp, high pressure pilot lamp installs on the shell, high pressure pilot lamp with CPU is connected.

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