CN211718504U - Alternating-current and direct-current function calibrator for insulation monitoring device - Google Patents
Alternating-current and direct-current function calibrator for insulation monitoring device Download PDFInfo
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- CN211718504U CN211718504U CN201922236710.5U CN201922236710U CN211718504U CN 211718504 U CN211718504 U CN 211718504U CN 201922236710 U CN201922236710 U CN 201922236710U CN 211718504 U CN211718504 U CN 211718504U
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 78
- 238000009413 insulation Methods 0.000 title claims abstract description 67
- 238000006243 chemical reaction Methods 0.000 claims abstract description 81
- 230000003993 interaction Effects 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 39
- 230000009471 action Effects 0.000 abstract description 11
- 230000004044 response Effects 0.000 abstract description 7
- 230000009466 transformation Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model discloses an insulation monitoring device exchanges and scurries straight function check gauge, including alternating current transformation unit, direct current conversion unit, switching value input/output unit, central control unit, human-computer interaction unit, to ground resistance output circuit and electric capacity output circuit, to ground resistance output circuit including many parallelly connected pure resistance branch roads of arranging, central control unit is connected with and is used for AD conversion unit. The utility model discloses can be used to accomplish the check-up of crossing straight survey note function, settlement action threshold value and fault response time to the insulating monitoring device of transformer substation, collect variable alternating current power supply, variable direct current and originate all over, the test wiring is simple, and is convenient for carry, also can regard as independent variable power supply to use, has filled the blank that does not have the insulating monitoring device function of professional equipment check-up at present, helps on-the-spot reliable, high-efficient, conveniently to accomplish the check-up work of insulating monitoring device function.
Description
Technical Field
The utility model relates to a check-up technique of insulating monitoring device of check-up transformer substation, concretely relates to insulating monitoring device is handed over and is scurried straight function check gauge.
Background
At present, insulation monitoring devices produced by various direct current manufacturers in China have different functions, and most of the insulation monitoring devices cannot monitor faults of simultaneous grounding of two direct current poles, direct current channeling and the like in real time. In field practice, a special qualified instrument for verifying the function of the insulation monitoring device is also lacked. In order to ensure that the insulation monitoring device for the transformer substation in the on-grid operation is qualified and reliable in function, a special insulation monitoring device calibration instrument needs to be developed urgently.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem who solves: to the above-mentioned problem of prior art, the utility model provides an insulating monitoring device is handed over and is scurried straight function check gauge, the utility model discloses can be used to accomplish insulating monitoring device of transformer substation hand over and scurries straight survey and note function, sets for action threshold value and fault response time's check-up, collect variable alternating current power supply, variable direct current and originate all in one, the test wiring is simple, and portable also can regard as independent variable power supply to use, has filled the blank that does not have professional equipment check-up insulating monitoring device function at present, helps the check-up work of on-the-spot reliable, high-efficient, conveniently accomplishing insulating monitoring device function.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model provides an insulation monitoring device exchanges and scurries straight function check gauge, includes AC conversion unit, direct current conversion unit, switching value input/output unit, central control unit, human-computer interaction unit, at least one to ground resistance output circuit and at least one electric capacity output circuit, AC conversion unit, direct current conversion unit all have power supply output end, DC conversion unit's control end, switching value input/output unit and human-computer interaction unit link to each other with central control unit respectively, to ground resistance output circuit includes many parallel arrangement's pure resistance branch road, central control unit is connected with and is used for AD conversion unit, AD conversion unit's input links to each other with AC conversion unit's output.
Optionally, the ac conversion unit includes a voltage regulator and an isolation transformer connected in series.
Optionally, the dc conversion unit includes a rectification module and a dc voltage dividing module connected in series, and a control end of the rectification module is connected to the central control unit.
Optionally, the dc voltage dividing module includes voltage dividing resistors R arranged in series2And an adjustable potentiometer R.
Optionally, the input end of the dc conversion unit is connected in parallel with a voltage stabilizing capacitor C1And the protective branch is formed by connecting the fuse FU in series.
Optionally, the output end of the dc conversion unit is connected in parallel with a voltage stabilizing capacitor C2。
Optionally, each pure resistance branch of the ground resistance output circuit is connected in series with a resistor and a selection switch.
Optionally, the capacitor output circuit includes a current-limiting resistor and a capacitor arranged in series, a transfer switch is connected to a middle node between the current-limiting resistor and the capacitor, the transfer switch has three selectable switching bits # 1 to #3, the selectable switching bit # 1 is a disconnected middle position, the selectable switching bit # 2 is a position for bypassing the current-limiting resistor through a bypass circuit, the selectable switching bit # 3 is a position for bypassing the capacitor through a bypass circuit connected in series with a discharge resistor, and the current-limiting resistor and the discharge resistor have the same resistance value.
Compared with the prior art, the utility model has the advantages of as follows:
1. the utility model discloses an exchange transform unit, AD converting unit, central control unit, switching value input/output unit, human-computer interaction unit and direct current conversion unit, can realize required interchange or DC voltage's output through exchange transform unit and direct current conversion unit, through the crossing of insulating monitoring device direct fault simulation, it realizes through exchanging transform unit to cross direct action threshold value check-up, direct current conversion unit can be used to provide DC power supply and check up insulating monitoring device functions such as on-line monitoring to DC system voltage for insulating monitoring device, consequently, can realize insulating monitoring device and cross direct function check-up.
2. The utility model discloses an alternating current conversion unit and direct current conversion unit can realize required interchange or DC voltage's output, collect variable alternating current power supply, variable direct current and come into one's body, and the test wiring is simple, and is convenient for carry, also can regard as independent variable power supply to use.
3. The utility model discloses filled the blank that does not have professional equipment check-up insulation monitoring device function at present, helped the check-up work of reliable, high-efficient, the convenient insulating monitoring device function of completion in scene.
Illustration of the drawings: 1. an alternating current conversion unit; 11. a voltage regulator; 12. an isolation transformer; 2. a DC conversion unit; 21. a rectification module; 22. a direct current voltage division module; 3. a switching value input/output unit; 4. a central control unit; 41. an A/D conversion unit; 5. a human-computer interaction unit; 6. a ground resistance output circuit; 7. a capacitive output loop; 71. a current limiting resistor; 72. a capacitor; 73. a switch; 74. and (4) discharging the resistor.
Drawings
Fig. 1 is the structural schematic diagram of the calibrator of the embodiment of the utility model.
Fig. 2 is a schematic structural diagram of a dc conversion unit according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a circuit principle of the dc output branch in the embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of an embodiment of the present invention.
Fig. 6 is a schematic diagram of a connection circuit for an ac series dc negative test in an embodiment of the present invention.
Fig. 7 is a schematic diagram of a connection circuit for an ac series dc positive test according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, the ac-to-dc function calibration instrument of the insulation monitoring apparatus in this embodiment includes an ac conversion unit 1, a dc conversion unit 2, a switching value input/output unit 3, a central control unit 4, a human-computer interaction unit 5, at least one ground resistance output circuit 6, and at least one capacitance output circuit 7, where the ac conversion unit 1 and the dc conversion unit 2 both have power supply output ends, the control end of the dc conversion unit 2, the switching value input/output unit 3, and the human-computer interaction unit 5 are respectively connected to the central control unit 4, the ground resistance output circuit 6 includes a plurality of pure resistance branches arranged in parallel, the central control unit 4 is connected to an a/D conversion unit 41, and an input end of the a/D conversion unit 41 is connected to an output end of the ac conversion unit 1. As shown in fig. 2, the ac conversion unit 1 and the dc conversion unit 6 use one path of ac 220V commercial power as energy supply input, the ac conversion unit 1 outputs an ac voltage with a continuously adjustable range of 0 to 500V (with a resolution of 0.1V), the dc conversion unit 6 outputs a dc voltage with a continuously adjustable range of 20 to 500V (with a resolution of 0.1V), and the ac-to-dc fault simulation and the ac-to-dc threshold value verification by the insulation monitoring device are implemented by the ac conversion unit 1.
As shown in fig. 1, the ac conversion unit 1 includes a voltage regulator 11 and an isolation transformer 12 connected in series, and the external ac mains supply is converted and isolated by the voltage regulator 11 and the isolation transformer 12, so that the interference rejection of the ac-dc function calibrator of the insulation monitoring apparatus of this embodiment is improved, and an adjustable ac power supply can be independently output.
The direct current conversion unit 2 is mainly used for providing a direct current power supply for the insulation monitoring device and checking the on-line monitoring of the insulation monitoring device on the voltage of the direct current system. As shown in fig. 2, the DC conversion unit 2 includes a rectification module 21 and a DC voltage dividing module 22 connected in series, a control end of the rectification module 21 is connected to the central control unit 4, AC-DC conversion can be realized through the rectification module 21, and controllable adjustment of the output DC voltage can be realized through the DC voltage dividing module 22.
As shown in fig. 3, the dc voltage divider block 22 includes voltage dividing resistors R arranged in series2And an adjustable potentiometer R, wherein an adjusting control end of the adjustable potentiometer R is connected with the central control unit 4, and the direct current conversion unit 6 can output a continuously adjustable (0.1V resolution) direct current voltage with the range of 20-500V.
As shown in fig. 3, the input terminal of the dc conversion unit 2 is connected in parallel with a voltage stabilizing capacitor C1A protection branch circuit formed by connecting with the fuse FU in series, and a voltage stabilizing capacitor C connected in parallel with the output end of the DC conversion unit 22。
The switching value input/output unit 3 is used for receiving the logic command output by the central control unit 4 and generating a signal for switching on or off the internal logic contact. The switching value input/output unit 3 can be used for realizing fault scene simulation.
The central control unit 4 is implemented based on a single chip microcomputer, is a core module of the alternating current-direct current functional calibrator of the insulation monitoring device in the embodiment, can realize the control of the a/D conversion unit 41, the switching value input/output unit 3 and the human-computer interaction unit 5, receives signals input by the human-computer interaction unit 5, and controls and outputs the output direct current voltage of the direct current conversion unit 2 and the internal logic contact of the switching value input/output unit 3; in addition, the voltage regulator 11 can also be connected with the central control unit 4 as required to automatically control the voltage regulator 11 to output an adjustable alternating voltage through the central control unit 4.
The a/D conversion unit 41 is connected to a voltage current transformer installed at the output end of the ac conversion unit 1, and is configured to perform analog-to-digital conversion on the converted voltage sampling signal to generate a digital signal that can be recognized by the central control unit 4.
In this embodiment, the human-computer interaction unit 5 adopts a high-resolution touch screen, and the central control unit 4 is used as a core processing element to realize the output of the voltage value and the switching value of the calibration device. Various check boxes are introduced into a human-computer interface of the human-computer interaction unit 5 to serve as input, and various complex combination functions can be flexibly checked to complete a required output mode. The human-computer interface of the human-computer interaction unit 5 also comprises a user use prompt, and when the function test of the insulation monitoring device is carried out, a corresponding prompt explanation appears on the liquid crystal interface to guide the completion of a related test process.
As shown in fig. 4, each pure resistor branch of the ground resistor output circuit 6 is connected in series with a resistor and a selection switch. Referring to fig. 4, in this embodiment, the resistors connected in series on each pure resistor branch are respectively 5k Ω, 10k Ω, 20k Ω, 30k Ω, 50k Ω, and 100k Ω, and two output terminals are designed at two ends of each pure resistor branch, so that the output connection is conveniently expanded.
As shown in fig. 5, the capacitor output circuit 7 includes a current limiting resistor 71 and a capacitor 72 arranged in series, and a switch 73 is connected to an intermediate node between the current limiting resistor 71 and the capacitor 72, and the switch 73 has three selectable switching bits # 1 to #3, where the selectable switching bit # 1 is an open intermediate position, the selectable switching bit # 2 is a position where the current limiting resistor 71 is bypassed by a bypass circuit, the selectable switching bit # 3 is a position where the capacitor 72 is bypassed by a bypass circuit connected in series with a discharge resistor 74, and the resistance values of the current limiting resistor 71 and the discharge resistor 74 are the same. When the capacitor output circuit 7 is not used, the selector switch 73 is connected from the selectable switching bit # 1 to the selectable switching bit # 3, and the discharging resistor 74 discharges electricity to ensure that the energy storage capacity of the capacitor 72 is 0; when the test platform is ready to be accessed, the change-over switch 73 is positioned at the middle position and can select the change-over position # 1, and the current-limiting resistor 71 is put into a test loop to ensure that no spark exists at the wiring moment; after the wiring is finished, the change-over switch 73 is connected with the selectable switching position #32 from the selectable switching position # 1, and the current limiting resistor 71 is bypassed, so that the test loop is ensured to only have the capacitor. The method for using the system capacitance output function of the capacitance output circuit 7 of the alternating current-direct function calibrator of the insulation monitoring device in the embodiment is as follows: 1. converting the change-over switch 73 from the selectable change-over position #3 (the change-over switch state testing platform panel is silk-printed with an indication) to the selectable change-over position # 1; 2. the insulation monitoring device is connected, and the two ends of the capacitor output terminal of the capacitor output loop 7 are respectively insulated from the bus and the test ground of the insulation monitoring device; 3. after the wiring is completed, the mode of converting the change-over switch 73 from the selectable change-over position # 1 to the selectable change-over position # 2 is tested; 4. after the test is completed, the test wiring is released, then the change-over switch 73 is switched from the selectable change-over bit # 2 to the selectable change-over bit # 3, the capacitor 72 is discharged, the test data is collated, and the test is completed.
The ac conversion unit 1 of the ac-to-dc functional calibration instrument of the insulation monitoring device of this embodiment is connected to the insulation monitoring device through an ac output terminal, and ac is supplied to the insulation monitoring device to adjust the ac voltage output of the ac conversion unit 1, and when the ac conversion unit is closed, the output control terminal is opened, and accordingly adjusted ac voltage output is obtained.
In addition, this embodiment provides an application method of the aforementioned alternating current to direct current functional check meter for an insulation monitoring device, including a step of an alternating current to direct current negative electrode test, where the detailed steps include:
A1) switching a change-over switch 73 from an optional change-over position #3 to an optional change-over position #2, under the condition that an alternating current conversion unit 1 and a direct current conversion unit 2 have no output, connecting a test relay J to be tested and an output switch between an anode + KM and a cathode-KM of an insulation monitoring device to be tested in series, respectively connecting an output end of the direct current conversion unit 2 to the anode + KM and the cathode-KM of the insulation monitoring device to be tested, connecting two pure resistance branches of a ground resistance output circuit 6 in series and then connecting the two pure resistance branches in parallel between the anode KM and the cathode-KM of the insulation monitoring device to respectively simulate an anode balance resistance value R + and a cathode balance bridge resistance value R-, connecting an output end of the alternating current conversion unit 1 and the cathode balance bridge resistance value R-in parallel, and connecting one end of a capacitance output loop 7 to a middle node between the test relay J to be tested and, The other end is connected with a grounded middle node between the resistance value R + of the anode balance resistor and the resistance value R-of the cathode balance bridge resistor, as shown in figure 6;
A2) switching the changeover switch 73 from the selectable switching position # 3 to the selectable switching position # 1;
A3) controlling the alternating current conversion unit 1 and the direct current conversion unit 2 to start outputting voltage, and switching on an output switch; recording the action test data of the relay J to be tested, judging that the action test check under the current alternating voltage passes if the action test data meets the requirement, and otherwise judging that the action test check under the current alternating voltage does not pass;
A4) disconnecting the output switch, judging whether the requirement of the test times is met, and if the requirement of the test times is met, skipping to execute the next step; otherwise, adjusting the output alternating voltage of the alternating current conversion unit 1, and skipping to execute the step A3);
A5) judging whether the tested insulation monitoring device needs to replace the test relay J to be tested or not, if so, replacing the test relay J to be tested, and skipping to execute the step A1); otherwise, end and exit.
The embodiment also comprises a step of alternating current channeling into the direct current negative electrode test, and the detailed steps comprise:
B1) switching a change-over switch 73 from an optional change-over position #3 to an optional change-over position #2, under the condition that an alternating current conversion unit 1 and a direct current conversion unit 2 have no output, connecting a test relay J to be tested and an output switch between a positive electrode + KM and a negative electrode-KM of an insulation monitoring device to be tested in series, respectively connecting an output end of the direct current conversion unit 2 to the positive electrode + KM and the negative electrode-KM of the insulation monitoring device to be tested, connecting two pure resistance branches of a ground resistance output circuit 6 in series and then connecting the two pure resistance branches in parallel between the positive electrode + KM and the negative electrode-KM of the insulation monitoring device to simulate a positive electrode balance resistance value R + and a negative electrode balance bridge resistance value R-respectively, connecting an output end of the alternating current conversion unit 1 in parallel with the positive electrode balance resistance value R +, connecting one end of a capacitance output loop 7 to a middle node between, The other end is connected with a grounded middle node between the resistance value R + of the anode balance resistor and the resistance value R-of the cathode balance bridge resistor, as shown in figure 6;
B2) switching the changeover switch 73 from the selectable switching position # 3 to the selectable switching position # 1;
B3) controlling the alternating current conversion unit 1 and the direct current conversion unit 2 to start outputting voltage, and switching on an output switch; recording the action test data of the relay J to be tested, judging that the action test check under the current alternating voltage passes if the action test data meets the requirement, and otherwise judging that the action test check under the current alternating voltage does not pass;
B4) disconnecting the output switch, judging whether the requirement of the test times is met, and if the requirement of the test times is met, skipping to execute the next step; otherwise, adjusting the output alternating voltage of the alternating current conversion unit 1, and skipping to execute the step B3);
B5) judging whether the tested insulation monitoring device needs to replace the test relay J to be tested or not, if so, replacing the test relay J to be tested, and skipping to execute the step B1); otherwise, end and exit.
In addition, this embodiment insulation monitoring device exchanges and scurries direct function check gauge and can also be used to carry out the function that the direct current examined to the insulation monitoring device that is surveyed, through the power supply to the insulation monitoring device that is surveyed, judge whether the voltage difference between the direct current electrode of the insulation monitoring device that is surveyed satisfies the requirement.
In addition, the alternating current-to-direct function calibrator for the insulation monitoring device in this embodiment can also be used for performing alternating current-to-direct fault response time calibration on the insulation monitoring device to be tested, and the step of the alternating current-to-direct fault response time calibration includes: disconnecting the tested insulation monitoring device; as shown in fig. 6, the positive electrode + KM and the negative electrode-KM of the insulation monitoring device to be tested are connected with the power supply output end of the ac conversion unit 1 in the ac-to-dc function tester of the insulation monitoring device; connecting a switching value input/output module of the tested insulation monitoring device with a switching value input/output unit 3 in the alternating-current direct-function calibrator of the insulation monitoring device; and controlling the alternating current conversion unit 1 to output alternating current voltage for testing, receiving a conducting signal output by a switching value input/output module of the insulation monitoring device to be tested through the switching value input/output unit 3 to obtain alternating current-to-direct fault response time, and judging that the verification is passed if the alternating current-to-direct fault response time meets the requirement. The tested insulation monitoring device realizes switching value output in a mode of receiving an external power signal to close or switch on an internal logic contact, so that the function of verifying the AC-DC fault response time can be realized, and when a power signal is input from the outside, the optical coupler is switched off to close the contact.
In addition, the alternating current-to-direct function calibrator for the insulation monitoring device can also be used for performing insulation reduction alarm function calibration on the insulation monitoring device to be tested, and disconnecting the insulation monitoring device to be tested; the positive electrode + KM and the negative electrode-KM of the insulation monitoring device to be detected are connected with the power supply output end of an alternating current conversion unit 1 in the insulation monitoring device alternating-direct function calibrator through a selector switch, the acquisition terminal of an A/D conversion unit 41 in the insulation monitoring device alternating-direct function calibrator respectively acquires the input resistance between the positive bus and the negative bus and the capacitance value of the positive bus and the capacitance value of the negative bus to the ground of the insulation monitoring device to be detected, and if the input resistance between the positive bus and the negative bus and the capacitance value of the positive bus and the capacitance value of the negative bus to the ground are matched with a preset range, the calibration is judged to be passed.
In addition, the alternating current-to-direct function calibrator for the insulation monitoring device can also be used for performing function calibration such as fault detection and recording on the insulation monitoring device to be tested. The fault recording, record refreshing and other mechanisms of the insulation monitoring device are checked by inputting different fault scenes from the outside. The method is characterized in that a checking device is adopted for multiple tests, whether the insulation monitoring device can accurately record each fault scene and whether a cyclic refreshing mechanism is correct (namely whether the checking insulation monitoring device follows a rule of preferentially covering the earliest historical record when the fault record reaches the upper limit) is checked by controlling and inputting different analog quantities to check the wave recording function of the insulation monitoring device, wherein the wave recording function comprises real-time monitoring of a direct-current power supply, instantaneous recording of a direct-current power supply ripple coefficient and a fault transient quantity and the like.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An alternating current-to-direct current function calibrator of an insulation monitoring device is characterized by comprising an alternating current conversion unit (1), a direct current conversion unit (2), a switching value input/output unit (3), a central control unit (4), a man-machine interaction unit (5), at least one ground resistance output circuit (6) and at least one capacitance output loop (7), wherein the alternating current conversion unit (1) and the direct current conversion unit (2) are respectively provided with a power supply output end, a control end of the direct current conversion unit (2), the switching value input/output unit (3) and the man-machine interaction unit (5) are respectively connected with the central control unit (4), the ground resistance output circuit (6) comprises a plurality of pure resistance branches arranged in parallel, and the central control unit (4) is connected with an A/D conversion unit (41), the input end of the A/D conversion unit (41) is connected with the output end of the alternating current conversion unit (1).
2. The insulation monitoring device ac-dc function checker according to claim 1, wherein the ac conversion unit (1) includes a voltage regulator (11) and an isolation transformer (12) connected in series.
3. The insulation monitoring device alternating current-direct current function calibrator according to claim 1, wherein the direct current conversion unit (2) comprises a rectification module (21) and a direct current voltage division module (22) which are connected in series, and a control end of the rectification module (21) is connected with the central control unit (4).
4. The insulation monitoring device AC-DC function checker according to claim 3, wherein the DC voltage dividing module (22) includes voltage dividing resistors R arranged in series2And an adjustable potentiometer R.
5. The insulation monitoring device AC-DC function checking instrument according to claim 3, characterized in that the input end of the DC conversion unit (2) is connected in parallel with a voltage-stabilizing capacitor C1And the protective branch is formed by connecting the fuse FU in series.
6. The method of claim 3The alternating current-direct current function calibrator of the insulation monitoring device is characterized in that the output end of the direct current conversion unit (2) is connected with a voltage stabilizing capacitor C in parallel2。
7. The insulation monitoring device ac-dc function checker according to claim 1, wherein a resistor and a selection switch are connected in series to each pure resistor branch of the ground resistor output circuit (6).
8. The insulation monitoring device AC-DC function checker according to claim 1, wherein the capacitance output circuit (7) comprises a current limiting resistor (71) and a capacitor (72) which are arranged in series, a transfer switch (73) is connected to an intermediate node between the current limiting resistor (71) and the capacitor (72), the transfer switch (73) has three selectable switching bits #1 to #3, the selectable switching bit #1 is an open intermediate position, the selectable switching bit #2 is a position for bypassing the current limiting resistor (71) through a bypass circuit, the selectable switching bit #3 is a position for bypassing the capacitor (72) through a bypass circuit connected in series with a discharge resistor (74), and the current limiting resistor (71) and the discharge resistor (74) have the same resistance.
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| CN201922236710.5U CN211718504U (en) | 2019-12-13 | 2019-12-13 | Alternating-current and direct-current function calibrator for insulation monitoring device |
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| CN201922236710.5U CN211718504U (en) | 2019-12-13 | 2019-12-13 | Alternating-current and direct-current function calibrator for insulation monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267658A (en) * | 2021-07-19 | 2021-08-17 | 广东电网有限责任公司惠州供电局 | Alternating current channeling fault simulation verification circuit, device and method |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113267658A (en) * | 2021-07-19 | 2021-08-17 | 广东电网有限责任公司惠州供电局 | Alternating current channeling fault simulation verification circuit, device and method |
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