CN105589006A - Resistor-assisted capacitor leakage measurement device - Google Patents
Resistor-assisted capacitor leakage measurement device Download PDFInfo
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- CN105589006A CN105589006A CN201410552739.3A CN201410552739A CN105589006A CN 105589006 A CN105589006 A CN 105589006A CN 201410552739 A CN201410552739 A CN 201410552739A CN 105589006 A CN105589006 A CN 105589006A
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- resistance
- throw switch
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Abstract
The invention discloses a resistor-assisted capacitor leakage measurement device, which comprises a power supply, a diode, a current meter, a left switch array and a right switch array, wherein each of the two switch arrays is composed of the same number of single-pole double-throw switches; in each switch array, two immovable ends of each single-pole double-throw switch are connected together correspondingly; the two immovable ends of each single-pole double-throw switch in the left switch array are respectively connected with the positive electrode of the power supply and the ground wire; the two immovable ends of each single-pole double-throw switch in the right switch array are respectively connected with the positive electrode of the diode and the ground wire; the measurement end of the current meter is connected between the negative electrode of the diode and the ground respectively; the immovable ends of the single-pole double-throw switches in the left switch array and the right switch array are in one-to-one correspondence connection in pairs through measurement branches; each measurement branch is composed of a measurement resistor and a to-be-measured capacitor in serial connection; and the measurement resistor is connected onto one side of the left switch array. A switch charge transfer mode is adopted, and through automatic switching of each switch, quick and batch measurement of multiple capacitor leakage values is realized.
Description
Technical field
The present invention relates to electronic circuit field, particularly, relate to a kind of resistance subsidiary electric capacity and sew device.
Background technology
Capacitor is the main devices that all can use on nearly all electrical equipment. Leaking resistance is in the tested numerous electric characteristics of capacitor. Leak resistance and be commonly called " IR " (InsulationResistance, insulaion resistance), represent with " megaohm-microfarad ". In other cases, sew the leakage current that may be represented as under specific voltage (being generally operating voltage).
Sewing of capacitor be by apply a fixed voltage to electric capacity, and measure the electric current producing and record. Leakage current will be exponential damping in time, therefore, before measuring electric current, apply voltage and must reach a known time cycle (dwell time).
For statistics object, the capacitor that must test some generates useful data. In order to test, just need a set of automatic switchover system.
Summary of the invention
Sew the value technical problem of measuring in enormous quantities for solving electric capacity, the invention discloses a kind of resistance subsidiary electric capacity and sew device.
Resistance subsidiary electric capacity of the present invention is sewed device, comprise power supply, diode, galvanometer, left-handed opening array and right switch arrays, two switch arrays are by the equal single-pole double-throw switch (SPDT) composition of quantity, in each switch arrays, two of each single-pole double-throw switch (SPDT) not moved end correspondence link together, wherein, two of each single-pole double-throw switch (SPDT) of left-handed opening array not moved end connect respectively positive source and ground wire, two of right each single-pole double-throw switch (SPDT) of switch arrays not moved end connect respectively diode cathode and ground wire, described galvanometric measuring junction connects respectively between diode cathode and ground, the not moved end of the single-pole double-throw switch (SPDT) of left-handed opening array and right switch arrays connects one to one by measuring branch road in pairs, and measuring resistance and the testing capacitance composition of route series connection propped up in described measurement, and described measuring resistance is connected to left-handed opening array one side.
Preferably, described galvanometric range is skin peace rank.
Concrete, the single-pole double-throw switch (SPDT) of described left-handed opening array is 7111-S or 7169A type.
Concrete, the single-pole double-throw switch (SPDT) of described right switch arrays is 7158 types.
Concrete, the RC time constant value of described measuring resistance and testing capacitance is 0.5-2 second.
Resistance subsidiary electric capacity of the present invention is sewed device, adopts switch-charge branch mode, by the automatic switchover of each switch, has realized multiple electric capacity and has sewed the rapid batch of value and measure.
Brief description of the drawings
Fig. 1 is a kind of detailed description of the invention schematic diagram of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is done to detailed description further, but embodiments of the present invention are not limited to this.
Resistance subsidiary electric capacity of the present invention is sewed device, comprise power supply, diode, galvanometer, left-handed opening array and right switch arrays, two switch arrays are by the equal single-pole double-throw switch (SPDT) composition of quantity, in each switch arrays, two of each single-pole double-throw switch (SPDT) not moved end correspondence link together, wherein, two of each single-pole double-throw switch (SPDT) of left-handed opening array not moved end connect respectively positive source and ground wire, two of right each single-pole double-throw switch (SPDT) of switch arrays not moved end connect respectively diode cathode and ground wire, described galvanometric measuring junction connects respectively between diode cathode and ground, the not moved end of the single-pole double-throw switch (SPDT) of left-handed opening array and right switch arrays connects one to one by measuring branch road in pairs, and measuring resistance and the testing capacitance composition of route series connection propped up in described measurement, and described measuring resistance is connected to left-handed opening array one side.
As shown in Figure 1, one group of switch (7111-S type or 7169A type) is used to apply test voltage to each capacitor. At normally closed position, one end of capacitor is connected to circuit LO. In the time of switch actuating, capacitor is connected to voltage source. Normally staggered (for example, 2 seconds, interval) of touching of switch, thus before measurement is sewed, each capacitor all can be by the identical time cycle of charging. If full test voltage is 110V or lower, can use 7111-S type switch card; Otherwise, can use the voltage of 7169A type switch card test up to 500V. If must apply the voltage higher than 500V, should use the switch with corresponding rated value.
Second group of switch (7158 type) is being connected to picoammeter by each capacitor after suitable stationary time. Note that before capacitor is switched to picoammeter, it is connected to circuit LO. So just make the leakage current also can continuous flow at its charging device. For this application, separate unit instrument provides voltage source and small current measurement function. 6517A type can show resistance or leakage current, and the voltage up to 1000VDC can be provided, so be particularly suitable for this application.
After testing capacitor, voltage source should be set to zero. Sometimes by electric capacity from test fixture remove before, must make its electric discharge. Note, the electric capacity (C) in Fig. 1 has formed discharge path by the normally-closed contact of relay. Cycle tests is synchronously as follows:
Static---7169A type relay is normally closed, and 7158 type relays are normally closed.
Applying voltage (dwell time)---7169A type relay is connected to normally opened contact, and 7158 type relays still keep normally closed.
Electric current---7169A type relay still remains on normally open position in measurement, and 7158 type relays are connected to normally opened contact.
Discharging capacitor---7169A type relay is connected to normally-closed contact, and 7158 type relays are connected to normally-closed contact.
Because the isolating switch on 7169A type C type switch card keeps being energized state during measuring electric current, all any drift currents from switch card all have nothing to do with measurement.
With the resistor (R) of capacitor's series be a critical elements in this test macro. It limits the charging current of each capacitor, and in the time that capacitor is short-circuited protective relay. In addition, this resistor also limits the ac gain of feedback ammeter. Generally speaking,, in the time that source electric capacity increases, noise gain also can increase. This resistor is finite value by gain-limitation. Reasonably limit value is that to make RC time constant be 0.5～2 second. The forward-biased diode of connecting with the HI terminal of electrometer (pA) also plays the effect of limiting AC gain.
" coaxial three posts-BNC " converter (7078-TRX-BNC type) is used to 6517A to be connected to 7158 type switch cards. Capacitor is connected to 7158 type switch cards by low noise coaxial cable. Can use insulated wire that 7111-S switch card is connected to capacitor. 7169A type is to connect by connector lug connector.
As mentioned above, can realize preferably the present invention.
Claims (5)
1. resistance subsidiary electric capacity is sewed device, it is characterized in that, comprise power supply, diode, galvanometer, left-handed opening array and right switch arrays, two switch arrays are by the equal single-pole double-throw switch (SPDT) composition of quantity, in each switch arrays, two of each single-pole double-throw switch (SPDT) not moved end correspondence link together, wherein, two of each single-pole double-throw switch (SPDT) of left-handed opening array not moved end connect respectively positive source and ground wire, two of right each single-pole double-throw switch (SPDT) of switch arrays not moved end connect respectively diode cathode and ground wire, described galvanometric measuring junction connects respectively between diode cathode and ground, the not moved end of the single-pole double-throw switch (SPDT) of left-handed opening array and right switch arrays connects one to one by measuring branch road in pairs, and measuring resistance and the testing capacitance composition of route series connection propped up in described measurement, and described measuring resistance is connected to left-handed opening array one side.
2. resistance subsidiary electric capacity according to claim 1 is sewed device, it is characterized in that, described galvanometric range is skin peace rank.
3. resistance subsidiary electric capacity according to claim 1 is sewed device, it is characterized in that, the single-pole double-throw switch (SPDT) of described left-handed opening array is 7111-S or 7169A type.
4. resistance subsidiary electric capacity according to claim 1 is sewed device, it is characterized in that, the single-pole double-throw switch (SPDT) of described right switch arrays is 7158 types.
5. resistance subsidiary electric capacity according to claim 1 is sewed device, it is characterized in that, the RC time constant value of described measuring resistance and testing capacitance is 0.5-2 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410552739.3A CN105589006A (en) | 2014-10-19 | 2014-10-19 | Resistor-assisted capacitor leakage measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410552739.3A CN105589006A (en) | 2014-10-19 | 2014-10-19 | Resistor-assisted capacitor leakage measurement device |
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| Publication Number | Publication Date |
|---|---|
| CN105589006A true CN105589006A (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410552739.3A Pending CN105589006A (en) | 2014-10-19 | 2014-10-19 | Resistor-assisted capacitor leakage measurement device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543971A (en) * | 2017-08-01 | 2018-01-05 | 新华三技术有限公司 | Capacitance measurement servicing unit, capacitance measurement system and method |
| CN108982947A (en) * | 2018-05-23 | 2018-12-11 | 重庆祥泰电气有限公司 | Electric wiring with subsidiary function and electric parameter measurement method |
-
2014
- 2014-10-19 CN CN201410552739.3A patent/CN105589006A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107543971A (en) * | 2017-08-01 | 2018-01-05 | 新华三技术有限公司 | Capacitance measurement servicing unit, capacitance measurement system and method |
| CN108982947A (en) * | 2018-05-23 | 2018-12-11 | 重庆祥泰电气有限公司 | Electric wiring with subsidiary function and electric parameter measurement method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160518 |
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| WD01 | Invention patent application deemed withdrawn after publication |