CN220040602U - Digital multifunctional insulation resistance testing device - Google Patents
Digital multifunctional insulation resistance testing device Download PDFInfo
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- CN220040602U CN220040602U CN202321224835.6U CN202321224835U CN220040602U CN 220040602 U CN220040602 U CN 220040602U CN 202321224835 U CN202321224835 U CN 202321224835U CN 220040602 U CN220040602 U CN 220040602U
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- 238000012360 testing method Methods 0.000 title claims abstract description 76
- 238000009413 insulation Methods 0.000 title claims abstract description 64
- 238000010586 diagram Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The digital multifunctional insulation resistance testing device comprises an instrument body, wherein a voltage selection switch, a change-over switch, wiring terminals L1-L3 and a grounding terminal are arranged outside the instrument body; a voltage selection switch for selecting a test voltage; the change-over switch is used for selecting a K1 gear, a K2 gear and a K3 gear and is used for measuring an A-BCE insulation resistance, a B-ACE insulation resistance and a C-ABE insulation resistance respectively; and the wiring terminals L1, L2 and L3 are respectively connected to three-phase testing positions of the phase 13 of the tested equipment A, the phase 14 of the tested equipment B and the phase 15 of the tested equipment C. The instrument body is internally provided with relay modules Z1-Z3, and the relay modules Z1-Z3 are used for controlling the change-over switch to change the gear of K1, the gear of K2 and the gear of K3. The digital multifunctional insulation resistance testing device of the utility model controls the relay to switch the internal wiring through the change-over switch, can realize safe, high-efficiency and non-changeover external test wiring to measure the three-phase insulation resistance of the tested equipment, and the measured value precision can meet the requirement.
Description
Technical Field
The utility model relates to the technical field of insulation resistance measurement, in particular to a digital multifunctional insulation resistance testing device.
Background
Insulation resistance measurement is the most commonly used and simplest method of checking the insulation condition of electrical equipment. Before the electrical equipment is changed from the non-operating state to the operating state, or before and after the insulation withstand voltage test is performed, a test of insulation resistance must be performed to determine whether the equipment is wetted or abnormal in insulation.
For example: when measuring cable or generating line three-phase insulation resistance, the measurement item: the A-BCE, the B-ACE and the C-ABE need to discharge tested equipment and switch wires to measure the insulation resistance of the next phase after each phase of insulation resistance is tested, the frequent switching test has low wiring efficiency and time consumption in operation, and the manual discharge is finished after each phase of test has potential safety hazards.
Disclosure of Invention
The method solves the problems of complicated wiring and low efficiency of the conventional test mode in which the test is frequently switched. The utility model provides a digital multifunctional insulation resistance testing device, which can realize safe, efficient and non-inverting external test wiring to measure three-phase insulation resistance of tested equipment by controlling a relay to switch internal wiring through a change-over switch, and the measured value precision can meet the requirement.
The technical scheme adopted by the utility model is as follows:
digital multi-functional insulation resistance testing arrangement includes:
the instrument body is provided with a voltage selection switch, a change-over switch, a wiring terminal L1, a wiring terminal L2, a wiring terminal L3 and a grounding terminal 10 outside the instrument body;
the voltage selection switch is used for selecting a test voltage;
the change-over switch is used for selecting a K1 gear, a K2 gear and a K3 gear and is used for measuring an A-BCE insulation resistance, a B-ACE insulation resistance and a C-ABE insulation resistance respectively;
the wiring terminal L1, the wiring terminal L2 and the wiring terminal L3 are respectively connected to three-phase testing positions of the phase A of the tested equipment, the phase B of the tested equipment and the phase C of the tested equipment through testing wires;
the instrument body is internally provided with relay modules Z1-Z3, and the relay modules Z1-Z3 are used for controlling the change-over switch to change the gear of K1, the gear of K2 and the gear of K3.
The instrument body is provided with a display screen outside.
The instrument body is equipped with test binding post outward, and test binding post includes "E" end, "G" end, "L" end.
The instrument body is provided with a test button and an on/off key.
The instrument body is provided with a shield terminal outside, which acts to separate the leakage current from entering the measurement loop.
The instrument is internal to be equipped with the relay switching circuit, and this return circuit includes: the single-pole multi-throw change-over switch comprises relay modules Z1-Z3 and a power supply module;
the positive pole of the power supply module is connected with one side of the single-pole multi-throw change-over switch, the other side of the single-pole multi-throw change-over switch comprises an N contact, a K1 contact, a K2 contact and a K3 contact, and the K1 contact, the K2 contact and the K3 contact correspond to a 'K1' gear, a 'K2' gear and a 'K3' gear of the change-over switch;
the negative electrode of the power supply module is connected with one end of the input side of the relay module Z1, the other end of the input side of the relay module Z1 is connected with the K1 contact, and the output side of the relay module Z1 is connected with the output terminal L1, the input terminal E and the input terminal L;
the negative electrode of the power supply module is connected with one end of the input side of the relay module Z2, the other end of the input side of the relay module Z1 is connected with the K2 contact, and the output side of the relay module Z2 is connected with the output terminal L2, the input terminal E and the input terminal L;
the negative pole of power module connects relay module Z3 input side one end, and relay module Z1 input side other end is connected K3 contact, and output terminal L3, input terminal E, input terminal L are connected to relay module Z3 output side.
The N contact corresponds to the N gear of the instrument body change-over switch.
The output terminal L1 corresponds to the connection terminal L1 of the instrument body.
The output terminal L2 corresponds to the connection terminal L2 of the instrument body.
The output terminal L3 corresponds to the connection terminal L3 of the instrument body.
The input terminal E corresponds to the wiring terminal E of the instrument body.
The input terminal L corresponds to the connection terminal L of the instrument body.
The utility model relates to a digital multifunctional insulation resistance testing device, which has the following technical effects:
1) According to the digital multifunctional insulation resistance testing device, the relay is controlled by the change-over switch to switch the internal wiring, so that the three-phase insulation resistance of tested equipment can be safely and efficiently measured without switching the external test wiring, and the measured value precision can meet the requirement.
2) When the three-phase insulation resistance of the tested power equipment (bus, cable and the like) needs to be measured, the digital multifunctional insulation resistance testing device controls the switching of the internal relay through the change-over switch, realizes that the three-phase insulation resistance of the tested equipment is measured without switching the test wiring line, and has an automatic discharging function.
3) The digital multifunctional insulation resistance testing device disclosed by the utility model is used for carrying out structural and functional transformation on the traditional digital megohmmeter, meanwhile, the function of the traditional megohmmeter is reserved, and the problems of complicated wiring and low efficiency of the conventional testing mode frequent switching test are solved.
4) The device of the utility model retains the conventional test function of the digital insulation resistance tester.
5) The insulation resistance testing device disclosed by the utility model is high in universality and easy to popularize.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of an insulation resistance testing device according to the present utility model.
FIG. 2 is a schematic diagram of an insulation resistance testing apparatus for testing A-BCE insulation resistance according to the present utility model.
FIG. 3 is a schematic diagram of an insulation resistance testing apparatus for testing B-ACE insulation resistance according to the present utility model.
FIG. 4 is a schematic diagram of an insulation resistance testing apparatus for testing C-ABE insulation resistance according to the present utility model.
Fig. 5 is a schematic diagram of switching of a test loop relay of the insulation resistance test device of the present utility model.
Wherein: the testing device comprises a 1-display screen, a 2-conventional digital insulation tester testing wiring terminal, a 3-testing button, a 4-voltage selection switch, a 5-on/off key, a 6-change-over switch, a 7-wiring terminal L1, an 8-wiring terminal L2, a 9-wiring terminal L3, a 10-grounding terminal, a 11-shielding terminal, a 12-testing wire, a 13-tested device A phase, a 14-tested device B phase and a 15-tested device C phase.
Detailed Description
The utility model relates to a digital multifunctional insulation resistance testing device, which decomposes the L-shaped testing terminal of a traditional digital megameter into 3 testing terminals K1, K2 and K3, wherein an insulation resistance measuring change-over switch is added to a tester, when three-phase insulation resistance of tested power equipment (bus bars, cables and the like) needs to be measured, the testing terminals K1, K2 and K3 are respectively connected to A, B, C three-phase testing positions of the tested equipment, the E-shaped terminal of the tester is grounded, the K1 gear is cut by operating the change-over switch knob, the interior of the tester is controlled by a relay module to change the change-over switch, the K1 terminal is a high-voltage output terminal, the K2 terminal, the K3 terminal and the E terminal are connected to a ground terminal, and the insulation resistance A-BCE can be measured by pressing a testing button 3.
Similarly, the B-ACE and C-ABE insulation resistances can be measured by operating the change-over switch, so that the three-phase insulation resistance of the tested equipment can be measured without switching the test wiring line, and the automatic discharging function is realized. The structure and the function are improved on the traditional digital megohmmeter, meanwhile, the function of the conventional megohmmeter is reserved, and the problems of complicated wiring and low efficiency of the frequent switching test in the existing test mode are solved. The following description is made with reference to the drawings.
(1) Working principle:
as shown in FIG. 1, the insulation resistance testing device of the utility model decomposes the L-shaped testing terminal of the traditional digital megameter into 3 testing terminals L1 7, L2 8 and L3 9, and the tester is added with a change-over switch 6 for insulation resistance measurement. When the three-phase insulation resistance of the cable or bus needs to be measured, the on/off key 5 is pressed, the voltage selection switch 4 is used for selecting the test voltage, the wiring terminals L1 7, L2 8 and L3 9 are respectively connected to the three-phase test positions of the phase 13 of the tested equipment A, the phase 14 of the tested equipment B and the phase 15 of the tested equipment C, and the grounding terminal 10 is grounded.
The switching switch 6 is operated to switch to a K1 gear, the switching switch is controlled to switch through the relay module, the wiring terminal L1 7 is a high-voltage output end, the wiring terminal L2 8, the wiring terminal L3 9 and the grounding terminal 10 are connected to the ground end, the test button 3 is pressed down, the insulation resistance of the A-BCE can be measured and automatically displayed on the display screen 1, and the instrument can automatically and fully discharge the phase A13 of the tested equipment after the test is finished;
similarly, the B-ACE and C-ABE insulation resistances can be measured by operating the change-over switch 6 to switch to the K2 gear and the K3 gear. In fig. 1, a conventional digital insulation tester test terminal 2 is a conventional megohmmeter test loop.
(2) Internal wiring switching mode:
as shown in fig. 2: when the change-over switch 6 is turned to the 'K1' gear, the inside of the tester is switched through the relay, the wiring terminal L1 7 is a high-voltage output end, the wiring terminal L2 8 and the wiring terminal L3 9 are communicated with the grounding terminal 10, and the insulation of the tested equipment A-BCE can be measured.
As shown in fig. 3: when the change-over switch 6 is turned to the 'K2' gear, the inside of the tester is switched through the relay, the wiring terminal L2 8 is a high-voltage output end, the wiring terminal L1 7 and the wiring terminal L3 9 are communicated with the grounding terminal 10, and the insulation of the tested equipment B-ACE can be measured.
As shown in fig. 4: when the change-over switch 6 is turned to the 'K3' gear, the inside of the tester is switched through the relay, the wiring terminal L3 9 is a high-voltage output end, the wiring terminal L1 7 and the wiring terminal L2 8 are communicated with the grounding terminal 10, and the insulation of the tested equipment C-ABE can be measured.
(3) Switching loop working principle of internal relay of tester:
the relay modules Z1-Z3 are all exchange relay modules.
1): when the single-pole multi-system switch is positioned at an N contact point, the relay module Z1, the relay module Z2 and the relay module Z3 are all in a power-off state, at the moment, the output terminal L1 and the input terminal E on the relay module Z1 are connected, the output terminal L2 and the input terminal E on the relay module Z2 are connected, and the output terminal L3 and the input terminal E on the relay module Z3 are connected;
2): when the single-pole multi-system switch is positioned at a K1 contact, the relay module Z1 is in an electrified state, the output terminal L1 and the input terminal E on the relay module Z1 are disconnected, the output terminal L1 and the input terminal L on the relay module Z1 are connected, at the moment, the relay modules Z2 and Z3 are in a power-off state, the output terminal L2 and the input terminal E on the relay module Z2 are connected, and the output terminal L3 and the input terminal E on the relay module Z3 are connected;
3): when the single-pole multi-system switch is positioned at a K2 contact, the relay module Z2 is in an electrified state, the output terminal L2 and the input terminal E on the relay module Z2 are disconnected, the output terminal L2 and the input terminal L on the relay module Z2 are connected, at the moment, the relay modules Z1 and Z3 are in a power-off state, the output terminal L1 and the input terminal E on the relay module Z1 are connected, and the output terminal L3 and the input terminal E on the relay module Z3 are connected;
4): when the single-pole multi-system switch is positioned at the K3 contact, the relay module Z3 is in an electrified state, the output terminal L3 and the input terminal E on the relay module Z3 are disconnected, the output terminal L3 and the input terminal L on the relay module Z3 are connected, at the moment, the relay modules Z1 and Z2 are in a power-off state, the output terminal L1 and the input terminal E on the relay module Z1 are connected, and the output terminal L2 and the input terminal E on the relay module Z2 are connected.
Claims (7)
1. Digital multi-functional insulation resistance testing arrangement, its characterized in that includes:
the device comprises an instrument body, wherein a voltage selection switch (4), a change-over switch (6), a wiring terminal L1, a wiring terminal L2, a wiring terminal L3 and a grounding terminal (10) are arranged outside the instrument body;
the voltage selection switch (4) is used for selecting a test voltage;
the change-over switch (6) is used for selecting a K1 gear, a K2 gear and a K3 gear;
the wiring terminal L1, the wiring terminal L2 and the wiring terminal L3 are respectively connected to three-phase test positions of a phase (13) of tested equipment, a phase (14) of tested equipment and a phase (15) of tested equipment;
the instrument body is internally provided with relay modules Z1-Z3, and the relay modules Z1-Z3 are used for controlling the change-over switch (6) to change the gear of K1, the gear of K2 and the gear of K3.
2. The digital versatile insulation resistance testing device according to claim 1, characterized in that: the instrument body is provided with a display screen (1) outside.
3. The digital versatile insulation resistance testing device according to claim 1, characterized in that: the instrument body is equipped with test binding post (2) outward, and test binding post (2) are including "E" end, "G" end, "L" end.
4. The digital versatile insulation resistance testing device according to claim 1, characterized in that: the instrument body is provided with a test button (3) and an on/off key (5) outside.
5. The digital versatile insulation resistance testing device according to claim 1, characterized in that: the instrument body is provided with a shielding terminal (11) outside.
6. The digital versatile insulation resistance testing device according to claim 1, characterized in that: the instrument is internal to be equipped with the relay switching circuit, and this return circuit includes: the single-pole multi-throw change-over switch comprises relay modules Z1-Z3 and a power supply module;
the positive pole of the power supply module is connected with one side of the single-pole multi-throw change-over switch, the other side of the single-pole multi-throw change-over switch comprises an N contact, a K1 contact, a K2 contact and a K3 contact, and the K1 contact, the K2 contact and the K3 contact correspond to a 'K1' gear, a 'K2' gear and a 'K3' gear of the change-over switch;
the negative electrode of the power supply module is connected with one end of the input side of the relay module Z1, the other end of the input side of the relay module Z1 is connected with the K1 contact, and the output side of the relay module Z1 is connected with the output terminal L1, the input terminal E and the input terminal L;
the negative electrode of the power supply module is connected with one end of the input side of the relay module Z2, the other end of the input side of the relay module Z1 is connected with the K2 contact, and the output side of the relay module Z2 is connected with the output terminal L2, the input terminal E and the input terminal L;
the negative pole of power module connects relay module Z3 input side one end, and relay module Z1 input side other end is connected K3 contact, and output terminal L3, input terminal E, input terminal L are connected to relay module Z3 output side.
7. The digital versatile insulation resistance testing device according to claim 6, wherein:
the N contact corresponds to the N gear of the instrument body change-over switch (6);
the output terminal L1 corresponds to a wiring terminal L1 of the instrument body;
the output terminal L2 corresponds to a wiring terminal L2 of the instrument body;
the output terminal L3 corresponds to a wiring terminal L3 of the instrument body;
the input terminal E corresponds to a wiring terminal E of the instrument body;
the input terminal L corresponds to the connection terminal L of the instrument body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321224835.6U CN220040602U (en) | 2023-05-19 | 2023-05-19 | Digital multifunctional insulation resistance testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321224835.6U CN220040602U (en) | 2023-05-19 | 2023-05-19 | Digital multifunctional insulation resistance testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220040602U true CN220040602U (en) | 2023-11-17 |
Family
ID=88744247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321224835.6U Active CN220040602U (en) | 2023-05-19 | 2023-05-19 | Digital multifunctional insulation resistance testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220040602U (en) |
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2023
- 2023-05-19 CN CN202321224835.6U patent/CN220040602U/en active Active
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