CN212410767U - Alternating current voltage withstand test device for high-voltage cable - Google Patents
Alternating current voltage withstand test device for high-voltage cable Download PDFInfo
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- CN212410767U CN212410767U CN202020849738.6U CN202020849738U CN212410767U CN 212410767 U CN212410767 U CN 212410767U CN 202020849738 U CN202020849738 U CN 202020849738U CN 212410767 U CN212410767 U CN 212410767U
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Abstract
An alternating current withstand voltage test device for a high-voltage cable comprises a voltage regulator, a test transformer, a voltmeter and a cable to be tested; the input end of the voltage regulator is correspondingly and electrically connected with an external power frequency power supply through a switch, the output end of the voltage regulator is correspondingly and electrically connected with the input end of the test transformer, two output ends of the test transformer are respectively and correspondingly connected with one end of a wire cable, and the other ends of the two wire cables are correspondingly connected with a ground wire; the binding post of voltmeter is connected with two wire and cable one-to-one respectively, the cable that awaits measuring is located between voltmeter and the ground wire wiring end, and just the cable that awaits measuring corresponds with a wire and cable and is connected, and this device can carry out effective withstand voltage test to 10kV and following high tension cable.
Description
Technical Field
The utility model belongs to the technical field of cable withstand voltage test technique and specifically relates to an exchange withstand voltage test device for high tension cable is related to.
Background
As is known, the wire and cable is a bridge between the power supply equipment and the electric equipment, and plays a role in transmitting electric energy, while nowadays when the industrialization is developed, the application of the wire and cable is more and more extensive, and the voltage that the wire and cable can bear is higher and higher; for high-voltage cables of 10kv or less, if the manufactured cable has defects, serious leakage occurs after the defective cable is electrified, and thus electric equipment is damaged, so that the cable needs to be subjected to a withstand voltage test before use to ensure the reliability of the cable during use; the traditional cable voltage withstand test adopts a direct current voltage withstand test method, but in the direct current voltage withstand test, due to space charge effect, the actual electric field intensity in insulation is several times higher than the working electric field intensity of cable insulation, so that even if the cable passes through the direct current test and breakdown does not occur, the cable insulation layer can be seriously damaged, thereby affecting the reliability of the cable; secondly, because the field intensity distribution of the applied direct current voltage is different from the field intensity distribution of the running alternating current voltage, the direct current test can not truly simulate the overvoltage born by the cable in the running state, and effectively discover the defects of the cable, the cable joint and the construction process; therefore, in view of the above, there is a need in the market for an apparatus capable of performing an effective withstand voltage test on high voltage cables of 10kV and below.
Disclosure of Invention
In order to overcome the not enough in the background art, the utility model discloses a withstand voltage test device exchanges for high tension cable.
In order to achieve the purpose, the utility model adopts the following technical scheme:
an alternating current withstand voltage test device for a high-voltage cable comprises a voltage regulator, a test transformer, a voltmeter and a cable to be tested; the input end of the voltage regulator is correspondingly and electrically connected with an external power frequency power supply U0 through a switch, the output end of the voltage regulator is correspondingly and electrically connected with the input end of the test transformer, two output ends of the test transformer are respectively and correspondingly connected with one end of a wire cable, and the other ends of the two wire cables are correspondingly connected with a ground wire; the wiring terminals of the voltmeter are respectively connected with the two electric wires and cables in a one-to-one correspondence manner, the cable to be tested is positioned between the voltmeter and the ground wire wiring terminal, and the cable to be tested is correspondingly connected with one electric wire and cable;
preferably, a shielding layer is arranged between the cable to be tested and the wire cable;
preferably, a reactor is arranged between the test transformer and the voltmeter, and a wire inlet end and a wire outlet end of the reactor are respectively and correspondingly connected with a wire cable.
Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has:
the utility model discloses an alternating current withstand voltage test device for high-voltage cable, can carry out step-up or step-down adjustment to power frequency power supply U0 voltage through the voltage regulator, then enlarge voltage into different test voltage values through the testing transformer to carry out withstand voltage test to the cable that awaits measuring of different specifications; the voltage meter can measure the test voltage value of the cable to be tested during the voltage withstand test, so that the output voltage of the voltage regulator can be slowly increased by a worker according to the value of the voltage meter, the accuracy of the test is ensured, and the safety of the experimental process is ensured; in addition, when the length of the cable to be tested is longer, the capacity of the cable to be tested can be correspondingly increased, the capacity change of the cable to be tested is met by increasing the capacity of the testing transformer in the traditional testing method, but the capacitance in the circuit of the device can be compensated through the reactor, the current value in the circuit can be reduced, the capacity of the testing transformer does not need to be increased, the testing requirement of the cable to be tested can be met, the adjusting times of workers on the capacity of the testing transformer can be finally reduced, the labor capacity of the workers is further reduced, and the purpose of saving energy can be achieved.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. a voltage regulator; 2. a switch; 3. testing the transformer; 4. a wire cable; 5. a ground wire; 6. a voltmeter; 7. A cable to be tested; 8. a shielding layer; 9. a reactor.
Detailed Description
The invention will be explained in more detail by the following examples, which disclose the invention and are intended to protect all technical improvements within the scope of the invention.
The alternating current withstand voltage test device for the high-voltage cable described in the attached figure 1 comprises a voltage regulator 1, a test transformer 3, a voltmeter 6 and a cable 7 to be tested; the input end of the voltage regulator 1 is correspondingly and electrically connected with an external power frequency power supply U0 through a switch 2, the output end of the voltage regulator 1 is correspondingly and electrically connected with the input end of a test transformer 3, two output ends of the test transformer 3 are respectively and correspondingly connected with one end of a wire cable 4, the other ends of the two wire cables 4 are correspondingly connected with a ground wire 5, due to the fact that the cross section area and the cable length of cables 7 to be tested are different, the test voltage suffered by different cables 7 to be tested in a voltage withstanding test is also different, the voltage regulator 1 can adjust the power frequency power supply U0 between 0V and 400V, the adjusted voltage is amplified through the test transformer 3, and finally the power frequency power supply U0 is converted into the corresponding test voltage; the binding posts of the voltmeter 6 are respectively connected with the two electric wires and cables 4 in a one-to-one correspondence manner, and the voltmeter 6 can measure the accurate voltage value output by the test transformer 3, namely the numerical value of the test voltage;
in addition, a reactor 9 is arranged between the test transformer 3 and the voltmeter 6, the wire inlet end and the wire outlet end of the reactor 9 are respectively correspondingly connected with an electric wire cable 4, when the length of the cable 7 to be tested is longer, the capacity of the cable 7 to be tested is correspondingly increased, the capacity change of the cable 7 to be tested is met by increasing the capacity of the test transformer 3 in the traditional test method, but the capacity in the circuit of the device can be compensated through the reactor 9, the current value in the circuit can be reduced, so that the capacity of the test transformer 3 does not need to be increased, the test requirement of the cable 7 to be tested can be met, the adjustment times of the capacity of the test transformer 7 by workers can be finally reduced, the labor amount of the workers is further reduced, the energy source saving purpose can be achieved, the voltage value of the reactor 9 is measured by the voltmeter 6 at the moment, and in addition, because the lengths of the cable, the number of the reactors 9 required to be used is different, so before the withstand voltage test of the cable 7 to be tested, the number of the reactors 9 is selected according to a lower diagram;
the cable 7 that awaits measuring is located between voltmeter 6 and the 5 wiring ends of ground wire, and the cable 7 that awaits measuring corresponds with a wire and cable 4 and is connected, as required, be equipped with shielding layer 8 between cable 7 and the wire and cable 4 that awaits measuring, this shielding layer 8 can effectively improve the insulating nature of being connected between cable 7 and the wire and cable 4 that awaits measuring.
When the alternating current withstand voltage test device for the high-voltage cable is implemented, firstly, one phase core wire of the cable 7 to be tested is correspondingly connected with the wire cable 4, and the other two phase core wires of the cable 7 to be tested are grounded; and then, knowing the test voltage required by the withstand voltage test of the cable 7 to be tested with the standard according to a table look-up, gradually increasing the power frequency power supply U0 to a corresponding test voltage value by adjusting the voltage regulator 1 and the test transformer 3, keeping the test voltage for 15min, quickly reducing the voltage to zero, disconnecting the test power supply, and finally, correspondingly testing the other two phases of the cable 7 to be tested.
The part of the utility model not detailed is prior art.
Claims (3)
1. The utility model provides an alternating current withstand voltage test device for high tension cable, characterized by: the device comprises a voltage regulator (1), a test transformer (3), a voltmeter (6) and a cable (7) to be tested; the input end of the voltage regulator (1) is correspondingly and electrically connected with an external power frequency power supply U0 through a switch (2), the output end of the voltage regulator (1) is correspondingly and electrically connected with the input end of the test transformer (3), two output ends of the test transformer (3) are respectively and correspondingly connected with one end of one electric wire cable (4), and the other ends of the two electric wire cables (4) are correspondingly connected with a ground wire (5); the binding post of voltmeter (6) is connected with two wire and cable (4) one-to-one respectively, the cable (7) that awaits measuring is located between voltmeter (6) and ground wire (5) wiring end, and just the cable (7) that awaits measuring is connected with a wire and cable (4) correspondence.
2. The ac withstand voltage test apparatus for high voltage cable according to claim 1, wherein: and a shielding layer (8) is arranged between the cable (7) to be tested and the wire cable (4).
3. The ac withstand voltage test apparatus for high voltage cable according to claim 1, wherein: a reactor (9) is arranged between the test transformer (3) and the voltmeter (6), and the wire inlet end and the wire outlet end of the reactor (9) are respectively and correspondingly connected with a wire cable (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020849738.6U CN212410767U (en) | 2020-05-20 | 2020-05-20 | Alternating current voltage withstand test device for high-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020849738.6U CN212410767U (en) | 2020-05-20 | 2020-05-20 | Alternating current voltage withstand test device for high-voltage cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212410767U true CN212410767U (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020849738.6U Active CN212410767U (en) | 2020-05-20 | 2020-05-20 | Alternating current voltage withstand test device for high-voltage cable |
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| CN (1) | CN212410767U (en) |
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2020
- 2020-05-20 CN CN202020849738.6U patent/CN212410767U/en active Active
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