CN218240191U - Leakage current testing arrangement before and after electric capacity surge - Google Patents
Leakage current testing arrangement before and after electric capacity surge Download PDFInfo
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- CN218240191U CN218240191U CN202221538236.7U CN202221538236U CN218240191U CN 218240191 U CN218240191 U CN 218240191U CN 202221538236 U CN202221538236 U CN 202221538236U CN 218240191 U CN218240191 U CN 218240191U
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Abstract
The utility model discloses a leakage current testing device before and after capacitor surge, which comprises a direct current power supply, a single-pole double-throw switch, an ammeter and an alternating current signal source; a capacitor leakage current testing station is arranged between the direct current power supply and the ammeter; the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of the direct current power supply through a lead, and the other terminal is connected with one pole of the ammeter through a lead; the other pole of the ammeter is connected with a common terminal of the single-pole double-throw switch; the normally closed terminal of the single-pole double-throw switch is grounded, and the normally open terminal of the single-pole double-throw switch is connected with an alternating current signal source. The utility model discloses a contact condition detection device, the erroneous judgement that can avoid basically testing contact failure to bring, the effect is best, and the cost is minimum.
Description
Technical Field
The utility model relates to a leakage current testing arrangement around electric capacity surge.
Background
The capacitive medium cannot be absolutely non-conductive, and when a dc voltage is applied to the capacitor, a leakage current is generated. If the leakage current is too large, the capacitor will be damaged by heat. Besides the electrolytic capacitor, the leakage current of other capacitors is extremely small, so the insulation performance is expressed by insulation resistance parameters; the electrolytic capacitor has a large leakage current, so that the insulation performance (proportional to the capacity) is represented by the leakage current. Applying the rated dc operating voltage to the capacitor will observe that the charging current begins to vary greatly, decreasing with time, and reaching a certain final value that is more steady state, referred to as leakage current. The method of measuring capacitor leakage is to apply a fixed voltage to the capacitor being measured and then measure the resulting current. The leakage current decays exponentially with time, so it is usually necessary to apply a voltage (soak time) over a known period of time and then measure the current. In the detection of the capacitor, the current or voltage surge applied to the capacitor needs to be examined, the leakage current change before and after the surge is tested, and the potential defects of the capacitor are judged and identified according to the change. However, in a production line, in an existing automatic capacitor testing device, a surge testing station is usually placed before two leakage current testing stations, a surge test is performed first, and then two leakage current tests are performed after the test. One of the functions of performing the leakage current test twice is to avoid the error of the test result caused by poor contact with the test contact of the capacitor, and the probability of the error of the test result caused by poor contact of the test contact can be obviously reduced by performing the leakage current test twice continuously. The existing equipment does not have a scheme of arranging a leakage current station before a surge test station, so that the equipment does not have the capability of comparing the accurate change of leakage current before and after the surge test.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect that exists among the prior art, provide a leakage current testing arrangement around electric capacity surge, the contact condition detection device of adoption is an alternating current testing arrangement of integration in leakage current testing arrangement, through applying alternating current signal to the test circuit of electric capacity, then detects alternating current signal's current strength to judge whether electric capacity test circuit switches on well. The method can basically avoid misjudgment caused by poor contact of the test contact, and has the best effect and the lowest cost.
In order to achieve the purpose, the technical scheme of the utility model is to design a leakage current testing device before and after capacitor surge, which comprises a direct current power supply, a single-pole double-throw switch, an ammeter and an alternating current signal source;
a capacitor leakage current testing station is arranged between the direct current power supply and the ammeter;
the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of the direct current power supply through a lead, and the other terminal is connected with one pole of the ammeter through a lead; the other pole of the ammeter is connected with a common terminal of the single-pole double-throw switch;
the normally closed terminal of the single-pole double-throw switch is grounded, and the normally open terminal of the single-pole double-throw switch is connected with an alternating current signal source. An alternating current testing device is integrated in the leakage current testing device to form a contact condition detecting device, and an alternating current signal is applied to a testing loop of the capacitor, and then the current intensity of the alternating current signal is detected, so that whether the conducting of the testing loop of the capacitor is good or not is judged. The method can basically avoid misjudgment caused by poor contact of the test contact, and has the best effect and the lowest cost.
The technical scheme is that two leakage current testing devices before and after the capacitor surge are arranged and are respectively arranged before and after a capacitor voltage surge testing station. And a leakage current testing station is arranged in front of the surge station, and a leakage current testing station is also arranged behind the surge station. And after the capacitor is tested at the first leakage current station, the capacitor is moved from the first leakage current station to a surge test station for surge test. And after the surge test is finished, the capacitor is moved from the surge test station to a second leakage current test station for leakage current test. The front leakage current testing station and the rear leakage current testing station are respectively provided with the device (namely the contact condition detection device) for reducing the test misjudgment caused by poor contact. Leakage current detection stations are arranged before and after the surge test station, so that the test device has the capability of comparing the accurate change of leakage current before and after the surge test.
The further technical proposal is that one direct current power supply is arranged; one alternating current signal source is arranged; the test station, the single-pole double-throw relay and the ammeter are all provided with a plurality of ones. Thus, the leakage current of a plurality of capacitors can be detected at one time.
The further technical scheme is that the number of the single-pole double-throw relays and the number of the ampere meters are consistent with the number of the test stations.
The further technical proposal is that the number of the single-pole double-throw relays is ten; the ammeter is a direct current ammeter; the capacitor to be tested is an aluminum electrolytic capacitor.
The utility model also provides a proposal that the leakage current testing device before and after the capacitor surge is provided with four leakage current testing devices and two leakage current testing devices are respectively arranged before and after the capacitor voltage surge testing station;
or the leakage current testing devices before and after the capacitor surge are provided with three leakage current testing devices, one leakage current testing device is arranged in front of the capacitor voltage surge testing station, and the other two leakage current testing devices are arranged behind the capacitor voltage surge testing station;
the leakage current testing device before and after the capacitor surge comprises a direct current power supply and an ammeter; a capacitor leakage current testing station is arranged between the direct current power supply and the ammeter;
the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of the direct current power supply through a lead, and the other terminal is connected with one pole of the ammeter through a lead; the other pole of the ammeter is connected with the other pole of the direct current power supply through a lead, and a switch is arranged on the lead. Leading, rearmounted leakage current station all adopt two test station to reduce the erroneous judgement because of the contact arouses, the effect is not as the utility model discloses a first scheme, the cost is also high. If the front leakage current testing station adopts a single testing station and the rear leakage current testing station adopts double testing stations, misjudgment caused by the single testing station is reduced, the effect is inferior to the scheme of arranging the leakage current testing stations in pairs, and the cost is relatively lower than that of the scheme.
The further technical scheme is that two leakage current testing devices before and after the capacitor surge are arranged and are respectively arranged before and after a capacitor voltage surge testing station;
the leakage current testing device before and after the capacitor surge comprises a direct-current power supply, a first single-pole double-throw switch at a front leakage current testing station, a second single-pole double-throw switch at a rear leakage current testing station and an ammeter; a capacitance leakage current testing station between the front leakage current testing station and the rear leakage current testing station;
the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with the common terminal of the first single-pole double-throw switch through a lead, and the other terminal is connected with the common terminal of the second single-pole double-throw switch through a lead;
the positive electrode of the direct-current power supply is connected with a normally closed contact of the first single-pole double-throw switch, a normally open contact of the first single-pole double-throw switch is connected with one electrode of a preposed current source, and the other electrode of the preposed current source is connected with a test contact which is arranged on a capacitor leakage current test station and is connected with the positive electrode of the capacitor to be tested;
the testing contact which is arranged on the capacitor leakage current testing station and connected with the negative electrode of the capacitor to be tested is connected with one pole of the rear current source, and the other pole of the rear current source is connected with the normally open contact of the second single-pole double-throw switch; an ammeter is connected between the normally closed contact of the second single-pole double-throw switch and the negative electrode of the direct-current power supply.
The utility model has the advantages and beneficial effects that: one direct current power supply is arranged; one alternating current signal source is arranged; the test station, the single-pole double-throw relay and the ammeter are all provided with a plurality of ones. Thus, the leakage current of a plurality of capacitors can be detected at one time.
An alternating current testing device is integrated in the leakage current testing device to form a contact condition detecting device, and whether the capacitance testing loop is well conducted or not is judged by applying an alternating current signal to the testing loop of the capacitance and then detecting the current intensity of the alternating current signal. The method can basically avoid misjudgment caused by poor contact of the test contacts, and has the best effect and the lowest cost.
Leakage current detection stations are arranged before and after the surge test station, so that the testing device has the capability of comparing the accurate change of the leakage current before and after the surge test.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of a leakage current testing device before and after a capacitor surge according to the present invention;
FIG. 2 is a schematic view of a second embodiment of the present invention;
fig. 3 is a schematic view of a third embodiment of the present invention;
fig. 4 is a schematic view of the connection structure of fig. 3.
In the figure: 1. a single pole double throw switch; 2. a capacitor leakage current test station; 3. a normally closed terminal; 4. a normally open terminal; 5. a second single pole double throw switch.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
as shown in fig. 1, the utility model relates to a leakage current testing device before and after capacitor surge, which comprises a direct current power supply, a single-pole double-throw switch 1, an ammeter and an alternating current signal source; a capacitor leakage current testing station 2 is arranged between the direct current power supply and the ammeter; the capacitor leakage current testing station 2 comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of the direct current power supply through a lead, and the other terminal is connected with one pole of the ammeter through a lead; the other pole of the ammeter is connected with a common terminal of the single-pole double-throw switch 1; the normally closed terminal 3 of the single-pole double-throw switch 1 is grounded, and the normally open terminal 4 of the single-pole double-throw switch 1 is connected with an alternating current signal source. One direct current power supply is arranged; one alternating current signal source is arranged; the number of the single-pole double-throw relays and the number of the ampere meters are consistent with the number of the test stations. The number of the single-pole double-throw relays is ten; the ammeter is a direct current ammeter; the capacitor to be tested is an aluminum electrolytic capacitor.
The leakage current testing devices before and after the capacitor surge are arranged in two and are respectively arranged in front of and behind a capacitor voltage surge testing station.
The second embodiment:
the difference from the first embodiment is that, as shown in fig. 2, two leakage current testing devices before and after the capacitor surge are arranged before and after the capacitor voltage surge testing station; the leakage current testing device before and after the capacitor surge comprises a direct-current power supply, a first single-pole double-throw switch at a front leakage current testing station, a second single-pole double-throw switch at a rear leakage current testing station and an ammeter; a capacitance leakage current testing station between the front leakage current testing station and the rear leakage current testing station; the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with the common terminal of the first single-pole double-throw switch through a lead, and the other terminal is connected with the common terminal of the second single-pole double-throw switch through a lead; the positive electrode of the direct-current power supply is connected with a normally closed contact of the first single-pole double-throw switch, a normally open contact of the first single-pole double-throw switch is connected with one electrode of a preposed current source, and the other electrode of the preposed current source is connected with a test contact which is arranged on a capacitor leakage current test station and is connected with the positive electrode of the capacitor to be tested; the test contact which is arranged on the capacitor leakage current test station and connected with the negative electrode of the capacitor to be tested is connected with one pole of the postposition current source, and the other pole of the postposition current source is connected with the normally open contact of the second single-pole double-throw switch; an ammeter is connected between the normally closed contact of the second single-pole double-throw switch and the negative electrode of the direct-current power supply.
The contact state detection device adopted by the preposed leakage current test station and the postpositive leakage current test station integrates a direct current test device in the leakage current test device, and the voltage between two contacts is tested by respectively adding a test contact to each of 2 electrodes of a capacitor, applying current between the newly added test contact and the leakage current test contact connected with the same capacitor electrode. The voltage tested was low, indicating good contact. If the voltage tested is high, it is indicated that the contact is not good.
Example three:
the difference from the first embodiment is that, as shown in fig. 3 and 4, the leakage current testing device before and after the capacitor surge includes a dc power supply, a single-pole double-throw switch 1, an ammeter and an ac signal source; a capacitor leakage current testing station 2 is arranged between the direct current power supply and the single-pole double-throw switch 1; the capacitor leakage current testing station 2 comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of a direct current power supply through a lead, and the other terminal is connected with a common terminal of the single-pole double-throw switch 1 through a lead; the normally closed terminal 3 of the single-pole double-throw switch 1 is grounded, the normally open terminal 4 of the single-pole double-throw switch 1 is connected with one pole of an ammeter, the other pole of the ammeter is connected with the common terminal of a second single-pole double-throw switch, the normally closed terminal of a second single-pole double-throw switch 5 is grounded, the normally open terminal of the second single-pole double-throw switch is connected with one pole of an alternating current signal source, and the other pole of the alternating current signal source is grounded. One direct current power supply is arranged; one alternating current signal source is arranged; one ammeter is arranged; the number of the single-pole double-throw relays is consistent with that of the test stations. The number of the single-pole double-throw relays is ten; the ammeter is a direct current ammeter; the capacitor to be tested is an aluminum electrolytic capacitor.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A leakage current testing device before and after capacitor surge is characterized by comprising a direct current power supply, a single-pole double-throw switch, an ammeter and an alternating current signal source;
a capacitor leakage current testing station is arranged between the direct current power supply and the ammeter;
the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of the direct current power supply through a lead, and the other terminal is connected with one pole of the ammeter through a lead; the other pole of the ammeter is connected with a common terminal of the single-pole double-throw switch;
the normally closed terminal of the single-pole double-throw switch is grounded, and the normally open terminal of the single-pole double-throw switch is connected with an alternating-current signal source.
2. The device of claim 1, wherein two leakage current testing devices are disposed before and after the capacitor surge testing station.
3. The apparatus for testing leakage current before and after a capacitor surge according to claim 2, wherein there is one dc power supply; one alternating current signal source is arranged; the test station, the single-pole double-throw relay and the ammeter are provided with a plurality of ones.
4. The device of claim 3, wherein the number of the single-pole double-throw relays and the number of the ammeters are the same as the number of the test stations.
5. The device for testing leakage current before and after capacitor surge according to claim 4, wherein the number of the single-pole double-throw relays is multiple; the ammeter is a direct current ammeter; the capacitor to be tested is an aluminum electrolytic capacitor.
6. The device for testing the leakage current before and after the capacitor surge is characterized in that four leakage current testing devices are arranged before and after the capacitor surge, and are arranged in pairs before and after a capacitor voltage surge testing station;
or the leakage current testing devices before and after the capacitor surge are provided with three leakage current testing devices, one leakage current testing device is arranged in front of the capacitor voltage surge testing station, and the other two leakage current testing devices are arranged behind the capacitor voltage surge testing station;
the leakage current testing device before and after the capacitor surge comprises a direct current power supply and an ammeter; a capacitor leakage current testing station is arranged between the direct current power supply and the ammeter;
the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of the direct current power supply through a lead, and the other terminal is connected with one pole of the ammeter through a lead; the other pole of the ammeter is connected with the other pole of the direct current power supply through a lead, and a switch is arranged on the lead.
7. The device for testing the leakage current before and after the capacitor surge is characterized in that the two devices for testing the leakage current before and after the capacitor surge are respectively arranged in front of and behind a capacitor voltage surge testing station;
the leakage current testing device before and after the capacitor surge comprises a direct-current power supply, a first single-pole double-throw switch at a front leakage current testing station, a second single-pole double-throw switch at a rear leakage current testing station and an ammeter; a capacitance leakage current testing station between the front leakage current testing station and the rear leakage current testing station;
the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with the common terminal of the first single-pole double-throw switch through a lead, and the other terminal is connected with the common terminal of the second single-pole double-throw switch through a lead;
the positive electrode of the direct-current power supply is connected with a normally closed contact of the first single-pole double-throw switch, a normally open contact of the first single-pole double-throw switch is connected with one electrode of a preposed current source, and the other electrode of the preposed current source is connected with a test contact which is arranged on a capacitor leakage current test station and is connected with the positive electrode of the capacitor to be tested;
the testing contact which is arranged on the capacitor leakage current testing station and connected with the negative electrode of the capacitor to be tested is connected with one pole of the rear current source, and the other pole of the rear current source is connected with the normally open contact of the second single-pole double-throw switch; an ammeter is connected between the normally closed contact of the second single-pole double-throw switch and the negative electrode of the direct-current power supply.
8. A leakage current testing device before and after capacitor surge is characterized by comprising a direct current power supply, a single-pole double-throw switch, an ammeter and an alternating current signal source; a capacitor leakage current testing station is arranged between the direct current power supply and the single-pole double-throw switch; the capacitor leakage current testing station comprises two terminals which are respectively used for being connected with the anode and the cathode of the capacitor to be tested; one of the two terminals is connected with one pole of a direct current power supply through a lead, and the other terminal is connected with a common terminal of the single-pole double-throw switch through a lead; the normally closed terminal of the single-pole double-throw switch is grounded, the normally open terminal of the single-pole double-throw switch is connected with one pole of an ammeter, the other pole of the ammeter is connected with the common terminal of the second single-pole double-throw switch, the normally closed terminal of the second single-pole double-throw switch is grounded, the normally open terminal of the second single-pole double-throw switch is connected with one pole of an alternating-current signal source, and the other pole of the alternating-current signal source is grounded.
9. The apparatus of claim 8, wherein the dc power supply comprises one; one alternating current signal source is arranged; one ammeter is arranged; the number of the single-pole double-throw relays is consistent with that of the test stations.
10. The apparatus for testing leakage current before and after a capacitor surge according to claim 9, wherein the number of the single-pole double-throw relays is plural; the ammeter is a direct current ammeter; the capacitor to be tested is an aluminum electrolytic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221538236.7U CN218240191U (en) | 2022-06-20 | 2022-06-20 | Leakage current testing arrangement before and after electric capacity surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221538236.7U CN218240191U (en) | 2022-06-20 | 2022-06-20 | Leakage current testing arrangement before and after electric capacity surge |
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| Publication Number | Publication Date |
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| CN218240191U true CN218240191U (en) | 2023-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221538236.7U Active CN218240191U (en) | 2022-06-20 | 2022-06-20 | Leakage current testing arrangement before and after electric capacity surge |
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| Country | Link |
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| CN (1) | CN218240191U (en) |
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- 2022-06-20 CN CN202221538236.7U patent/CN218240191U/en active Active
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