CN204989374U - Insulator leakage current monitoring devices - Google Patents
Insulator leakage current monitoring devices Download PDFInfo
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- CN204989374U CN204989374U CN201520679405.2U CN201520679405U CN204989374U CN 204989374 U CN204989374 U CN 204989374U CN 201520679405 U CN201520679405 U CN 201520679405U CN 204989374 U CN204989374 U CN 204989374U
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- vdr
- leakage current
- dependent resistor
- voltage dependent
- power supply
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- 239000012212 insulator Substances 0.000 title claims abstract description 32
- 238000012806 monitoring device Methods 0.000 title claims abstract description 18
- 230000001052 transient effect Effects 0.000 claims description 37
- 230000001419 dependent effect Effects 0.000 claims description 32
- 230000001012 protector Effects 0.000 claims description 20
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 9
- 229960001296 zinc oxide Drugs 0.000 claims description 8
- 239000011787 zinc oxide Substances 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000013480 data collection Methods 0.000 abstract 4
- 230000006378 damage Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model provides an insulator leakage current monitoring devices. It includes current sensor, data collection card, power protection ware and PC, wherein: data collection card's an analog signal input is connected with current sensor, and voltage sensor is connected to another analog signal input of data collection card, data collection card's data output end is connected with the PC, and the power end of PC is connected with power DY through the power protection ware. The utility model provides an insulator leakage current monitoring devices's effect: can use multiple protection means to carry out effectual protection to each part of monitoring system again like the essential characteristic that reflects leakage current on the spot to can strictly guarantee measurement system's safe operation.
Description
Technical field
The utility model belongs to insulator leakage current detect technical field, particularly relates to a kind of insulator leakage current monitoring device.
Background technology
For the monitoring of contaminated insulator leakage current, conduct extensive research both at home and abroad, mainly tend to the method simultaneously gathering leakage current and pulse current, to improve the accuracy of breakdown judge.But up to now, about the measurement of leakage current in high voltage and insulator, particularly utilize the measuring study of instrument to insulator leakage current change procedure to have not yet to see report.
Summary of the invention
In order to solve the problem, the purpose of this utility model is to provide a kind of insulator leakage current monitoring device.
In order to achieve the above object, the insulator leakage current monitoring device that the utility model provides comprises: current sensor, data collecting card, power supply protector and PC; Wherein: an input end of analog signal of data collecting card is connected with current sensor, another input end of analog signal of data collecting card connects voltage sensor; The data output end of data collecting card is connected with PC, and the power end of PC is connected with power supply DY by power supply protector.
Described current sensor is by the first resistance Rs1, second resistance Rs2, first transient diode TVS1, second transient diode TVS2, first voltage dependent resistor (VDR) Rc1, second voltage dependent resistor (VDR) Rc2 and the first discharge tube G is formed, wherein: the first resistance Rs1, first transient diode TVS1 is connected with the first output terminal Uo1 with one end of the first voltage dependent resistor (VDR) Rc1, the other end is connected with the second output terminal Uo2, second resistance Rs2, second transient diode TVS2 is connected with the second output terminal Uo2 with one end of the second voltage dependent resistor (VDR) Rc21, the other end is connected with ground wire, one end of first discharge tube G is connected with the first output terminal Uo1, the other end is connected with ground wire, first output terminal Uo1 is the detection input end of this current sensor simultaneously, be connected with insulator leakage current test lead, the ground wire of this current sensor is connected with test earth polar, two output terminals of this current sensor, namely the first output terminal Uo1 and the second output terminal Uo2 are connected with the analog input interface of two analog to digital conversion passages in data collecting card 2 respectively.
Described power supply protector is made up of resistance R, transient diode TVS, voltage dependent resistor (VDR) R1 and the second discharge tube G; wherein: resistance R, transient diode TVS, voltage dependent resistor (VDR) R1 and the second discharge tube G tetra-elements rear one end parallel with one another are that protection input end is connected with the phase line of protected power supply; the other end is protecting field line end, is connected with protected power supply DY zero line.
Transient diode TVS in the first transient diode TVS1 in described current sensor, the second transient diode TVS2 and power supply protector is Transient Suppression Diode, and the voltage dependent resistor (VDR) R1 in the first voltage dependent resistor (VDR) Rc1 in current sensor, the second voltage dependent resistor (VDR) Rc2 and power supply protector is Zinc-oxide piezoresistor.
Described transient diode TVS selects the TVS pipe of DO-15LP6KE6.8CA model; Voltage dependent resistor (VDR) R1 selects the Zinc-oxide piezoresistor of DO15L Ф 07KD180 model; The model of the second discharge tube G is 2RL075M5.5L/S.
The effect of the insulator leakage current monitoring device that the utility model provides: the essential characteristic that can reflect leakage current faithfully; multiple salvo is used again effectively to protect monitoring system each several part, thus can the safe operation of strict guarantee measuring system.
Accompanying drawing explanation
The insulator leakage current monitoring device structural representation that Fig. 1 provides for the utility model.
Fig. 2 is current sensor circuit schematic diagram in this device.
Fig. 3 is power supply protector circuit theory diagrams in this device.
Embodiment
Below in conjunction with the drawings and specific embodiments, the insulator leakage current monitoring device that the utility model provides is described in detail.
As shown in Figure 1, the insulator leakage current monitoring device that the utility model provides comprises:
Current sensor 1, data collecting card 2, power supply protector 3 and PC 4; Wherein: an input end of analog signal of data collecting card 2 is connected with current sensor 1, another input end of analog signal of data collecting card 2 connects voltage sensor; The data output end of data collecting card 2 is connected with PC 4, and the power end of PC 4 is connected with power supply DY by power supply protector 3.
Current sensor 1 for being connected on the current sensor between insulator leakage current test lead and ground, for detecting insulator leakage current;
Data collecting card 2 is multi-channel A/D conversion device, for the voltage signal Vd that acquisition testing insulator leakage current signal Id and other voltage sensor gather;
Power supply protector 3, for being serially connected in the overvoltage protection on PC 4 working power line, for preventing insulator arc-over from causing earthy raising instantaneously, causes the destruction of PC 4 thus.
Current sensor 1 adopts multisection type noninductive resistance point flow sensor, namely the noninductive resistance of multiple different magnitude resistance is utilized to be in series, when making leakage current to be measured flow through current sensor 1 completely, be voltage signal by leakage current signal through resistance conversion by the dividing potential drop effect of these different valued resistor, then send into data collecting card 2 by cable and measure.
The leakage current signal Id of data collecting card 2 adopts the mode of the Differential Input of signal, two-way collection is divided to same signal, also need two paths of signals to synthesize a complete signal in follow-up data processing section, require the necessary stringent synchronization of two passages, the selected each passage of data collecting card 2 has an independently A/D converter.Sample frequency is decided to be 10kHz to 200kHz.The Maximum Measurable Range of data collecting card 2 input voltage range is ± 10V.The resolution wherein chosen is 12bits; Be changed to 20V according to the maximum input range of voltage, can obtain acquisition system precision is 5mV.
As shown in Figure 2, described current sensor 1 is by the first resistance Rs1, second resistance Rs2, first transient diode TVS1, second transient diode TVS2, first voltage dependent resistor (VDR) Rc1, second voltage dependent resistor (VDR) Rc2 and the first discharge tube G is formed, wherein: the first resistance Rs1, first transient diode TVS1 is connected with the first output terminal Uo1 with one end of the first voltage dependent resistor (VDR) Rc1, the other end is connected with the second output terminal Uo2, second resistance Rs2, second transient diode TVS2 is connected with the second output terminal Uo2 with one end of the second voltage dependent resistor (VDR) Rc21, the other end is connected with ground wire, one end of first discharge tube G is connected with the first output terminal Uo1, the other end is connected with ground wire, first output terminal Uo1 is the detection input end of this current sensor 1 simultaneously, be connected with insulator leakage current test lead, the ground wire of this current sensor 1 is connected with test earth polar, two output terminals of this current sensor 1, namely the first output terminal Uo1 and the second output terminal Uo2 are connected with the analog input interface of two analog to digital conversion passages in data collecting card 2 respectively.
The shunt resistance of two-stage type taked by current sensor 1, connected in circuit to be monitored, wherein the first resistance Rs1 and the second resistance Rs2 is sampling resistor, leakage current waveform larger and less to amplitude is respectively sampled, the value that the input of data collecting card 2 remains larger can be ensured, thus improve the precision of system; When leakage current I is less, jointly gathered by the first resistance Rs1 and the second resistance Rs2, the voltage signal of output is obtained by the first output terminal Uo1 terminal; And when leakage current I is larger, only gathered by the second resistance Rs2, the voltage signal of output is obtained by the second output terminal Uo2; It should be noted that after contaminated insulator develops into the flashover stage by shelf depreciation, its surface leakage current value increases severely, and usually reaches tens of ampere, can meet enough current carrying capacities when this just requires to choose noninductive resistance; For this reason, the utility model have selected a kind of power type wire wound resistor---and metal aluminum casing resistor is as the first resistance Rs1 and the second resistance Rs2.The leakage current monitoring range that the utility model designs in advance is 1mA-5A, and the first resistance Rs1 therefore adopted and the nominal value of the second resistance Rs2 are respectively 50W, 1 Ω J and 50W, 10 Ω J.
As shown in Figure 3; described power supply protector 3 is made up of resistance R, transient diode TVS, voltage dependent resistor (VDR) R1 and the second discharge tube G; wherein: resistance R, transient diode TVS, voltage dependent resistor (VDR) R1 and the second discharge tube G tetra-elements rear one end parallel with one another are that protection input end is connected with the phase line of protected power supply; the other end is protecting field line end, is connected with protected power supply DY zero line.
Transient diode TVS in the first transient diode TVS1 in described current sensor 1, the second transient diode TVS2 and power supply protector 3 is Transient Suppression Diode, and the voltage dependent resistor (VDR) R1 in the first voltage dependent resistor (VDR) Rc1 in current sensor 1, the second voltage dependent resistor (VDR) Rc2 and power supply protector 3 is Zinc-oxide piezoresistor.
Described power supply protector 3 adopts the pressure-limit current-limit device such as transient diode TVS, the voltage dependent resistor (VDR) R1 in parallel with resistance R and the second discharge tube G as the multi-stag overvoltage protection of sensor, effectively protects whole system.
Wherein, first order protection have employed transient diode TVS.According to the measured value of tested electric current, select the TVS pipe of DO-15LP6KE6.8CA model.When the voltage at resistance R two ends exceedes the input range of data collecting card 2, switch closes automatically, provides discharge loop, and the voltage at resistance R two ends is remained in the input range of data collecting card 2.Voltage dependent resistor (VDR) R1 selects the Zinc-oxide piezoresistor of DO15L Ф 07KD180 model.Zinc-oxide piezoresistor voltage rejection characteristics is good, and residual voltage level is lower than transient diode TVS, but the transient state through-current capability of transient diode TVS is less, therefore Zinc-oxide piezoresistor is elected to be the second class protection device of protection system.During overcurrent, the voltage at voltage dependent resistor (VDR) R1 two ends is suppressed, and basic maintenance is constant.
The essence of the second discharge tube G is two tight close plate electrodes; when there is superpotential or excess current, gap breakdown, large energy of can releasing; therefore the second discharge tube G is used as the three-level protective device of system, and is responsible for the effect of dash current energy of releasing.The model of the second discharge tube G that the utility model is selected is 2RL075M5.5L/S.
The power supply protector 3 of the utility model design can bear the dash current of more than 5A, and output voltage control is within ± 10V, can play the effect of protection system.
The course of work of the insulator leakage current monitoring device that the utility model provides is: when specifically using, and is sealed in by current sensor 1 between testing current end and ground, ensures the complete acquisition of leakage current signal.Then the leakage current of insulator surface is sampled through current sensor 1, is converted to after filtering interfering the simulating signal of applicable data collecting card 2 input, carries out digital-to-analog conversion again and become the manageable digital signal of PC 4 after data collecting card 2 gathers.What meanwhile input also has voltage signal, and it is obtained by other voltage sensor and input data collecting card 2 and processes, and finally carries out analyzing and processing by PC 4.During simultaneously in order to ensure that measuring system work unlikely caused by pollution flashover superpotential, excess current damage, a power supply protector 3 is connected with PC 4 power supply, prevents insulator arc-over from causing earthy raising instantaneously, thus destruction PC 4.
Claims (5)
1. an insulator leakage current monitoring device, is characterized in that: described insulator leakage current monitoring device comprises: current sensor (1), data collecting card (2), power supply protector (3) and PC (4); Wherein: an input end of analog signal of data collecting card (2) is connected with current sensor (1), another input end of analog signal of data collecting card (2) connects voltage sensor; The data output end of data collecting card (2) is connected with PC (4), and the power end of PC (4) is connected with power supply DY by power supply protector (3).
2. insulator leakage current monitoring device according to claim 1, it is characterized in that: described current sensor (1) is by the first resistance Rs1, second resistance Rs2, first transient diode TVS1, second transient diode TVS2, first voltage dependent resistor (VDR) Rc1, second voltage dependent resistor (VDR) Rc2 and the first discharge tube G is formed, wherein: the first resistance Rs1, first transient diode TVS1 is connected with the first output terminal Uo1 with one end of the first voltage dependent resistor (VDR) Rc1, the other end is connected with the second output terminal Uo2, second resistance Rs2, second transient diode TVS2 is connected with the second output terminal Uo2 with one end of the second voltage dependent resistor (VDR) Rc21, the other end is connected with ground wire, one end of first discharge tube G is connected with the first output terminal Uo1, the other end is connected with ground wire, first output terminal Uo1 is the detection input end of this current sensor (1) simultaneously, be connected with insulator leakage current test lead, the ground wire of this current sensor (1) is connected with test earth polar, two output terminals of this current sensor (1), namely the first output terminal Uo1 and the second output terminal Uo2 are connected with the analog input interface of two analog to digital conversion passages in data collecting card (2) respectively.
3. insulator leakage current monitoring device according to claim 1; it is characterized in that: described power supply protector (3) is made up of resistance R, transient diode TVS, voltage dependent resistor (VDR) R1 and the second discharge tube G; wherein: resistance R, transient diode TVS, voltage dependent resistor (VDR) R1 and the second discharge tube G tetra-elements rear one end parallel with one another are that protection input end is connected with the phase line of protected power supply; the other end is protecting field line end, is connected with protected power supply DY zero line.
4. the insulator leakage current monitoring device according to Claims 2 or 3; it is characterized in that: the transient diode TVS in the first transient diode TVS1 in described current sensor (1), the second transient diode TVS2 and power supply protector (3) is Transient Suppression Diode, the voltage dependent resistor (VDR) R1 in the first voltage dependent resistor (VDR) Rc1 in current sensor (1), the second voltage dependent resistor (VDR) Rc2 and power supply protector (3) is Zinc-oxide piezoresistor.
5. insulator leakage current monitoring device according to claim 3, is characterized in that: described transient diode TVS selects the TVS pipe of DO-15LP6KE6.8CA model; Voltage dependent resistor (VDR) R1 selects the Zinc-oxide piezoresistor of DO15L Ф 07KD180 model; The model of the second discharge tube G is 2RL075M5.5L/S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520679405.2U CN204989374U (en) | 2015-09-06 | 2015-09-06 | Insulator leakage current monitoring devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520679405.2U CN204989374U (en) | 2015-09-06 | 2015-09-06 | Insulator leakage current monitoring devices |
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| Publication Number | Publication Date |
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| CN204989374U true CN204989374U (en) | 2016-01-20 |
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| CN201520679405.2U Active CN204989374U (en) | 2015-09-06 | 2015-09-06 | Insulator leakage current monitoring devices |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021232549A1 (en) * | 2020-05-21 | 2021-11-25 | 湖南省湘电试研技术有限公司 | Lightning protection insulator tolerance characteristic test method, test circuit, and design method |
| DE102022214187A1 (en) | 2022-12-21 | 2024-06-27 | Robert Bosch Gesellschaft mit beschränkter Haftung | Circuit arrangement, electrical energy storage system, device and method |
-
2015
- 2015-09-06 CN CN201520679405.2U patent/CN204989374U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021232549A1 (en) * | 2020-05-21 | 2021-11-25 | 湖南省湘电试研技术有限公司 | Lightning protection insulator tolerance characteristic test method, test circuit, and design method |
| DE102022214187A1 (en) | 2022-12-21 | 2024-06-27 | Robert Bosch Gesellschaft mit beschränkter Haftung | Circuit arrangement, electrical energy storage system, device and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |