CN217443437U - Adjustable voltage and current acquisition device and system - Google Patents
Adjustable voltage and current acquisition device and system Download PDFInfo
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- CN217443437U CN217443437U CN202220588088.3U CN202220588088U CN217443437U CN 217443437 U CN217443437 U CN 217443437U CN 202220588088 U CN202220588088 U CN 202220588088U CN 217443437 U CN217443437 U CN 217443437U
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Abstract
The embodiment of the utility model relates to an adjustable voltage and current acquisition device and a system, wherein the acquisition device comprises a three-phase voltage acquisition module and a three-phase current acquisition module; the three-phase voltage acquisition module acquires three-phase voltage through a single-capacitor-core high-voltage capacitor acquisition loop and outputs the three-phase acquired voltage through an isolation transformer; the three-phase current acquisition module acquires three-phase current through the single-coil current acquisition circuit and outputs three-phase acquired current through the current transformer. The embodiment of the utility model provides an adjustable voltage current collection system and system adopts single-capacitance core high voltage electric capacity collection circuit to gather the three-phase voltage, and wherein the secondary phase voltage is kept apart with secondary zero sequence voltage sampling circuit, avoids signal interference, and secondary phase, zero sequence voltage ratio difference and angle difference all can be adjusted; a single-coil current acquisition loop is adopted to acquire three-phase current, and a one-thousandth high-precision resistor is adopted as a sampling resistor. The device has the characteristics of small volume, low cost, light weight, low fault risk and high detection precision.
Description
Technical Field
The embodiment of the utility model provides a relate to electrical measurement technical field, especially relate to an adjustable voltage electric current collection system and system.
Background
The construction of domestic power grids is different day by day, so the requirement of the power grid construction on metering measurement is higher and higher, the importance of miniaturization and high reliability is obvious, the application technology of the electronic voltage and current sensor is mature, and the content of deep one-time and two-time fusion is increased from the conventional one-time and two-time fusion in the past as can be seen from the requirement of a new specification of one-time and two-time fusion special inspection of the national grid. The voltage transformer is used for providing line voltage measurement, zero sequence voltage measurement and the like in the past, and gradually develops towards the direction of only supplying power, so that the volume and the capacity of the voltage transformer can be reduced, and the risk of resonance of a power grid is reduced.
The existing electronic voltage sensor mostly adopts a sampling mode of double high-voltage capacitor cores, two high-voltage capacitor cores on each phase loop are connected in parallel, one high-voltage capacitor core is used for collecting phase voltage, and the other high-voltage capacitor core is used for collecting zero-sequence voltage. The voltage acquisition mode has the defects of large volume, high cost, high weight, high risk and single-phase earth fault caused by the insulation problem of any one of the two high-voltage capacitor cores.
The existing electronic current sensor mostly adopts a double-iron-core sampling mode, two current coils are connected in series in each phase loop, one current coil is used for collecting phase current, and the other current coil is used for collecting zero-sequence current.
SUMMERY OF THE UTILITY MODEL
Based on the above circumstances of prior art, the utility model provides an aim at provides an adjustable voltage current collection system and system adopts single-capacitance core high-voltage capacitor to gather the three-phase voltage in the return circuit to and the three-phase current is gathered in the single coil current collection return circuit, and the trouble risk is low and detect the precision height.
In order to achieve the above object, according to one aspect of the present invention, there is provided an adjustable voltage and current collecting device, comprising a three-phase voltage collecting module and a three-phase current collecting module;
the three-phase voltage acquisition module acquires three-phase voltage through a single-capacitor-core high-voltage capacitor acquisition loop and outputs the three-phase acquired voltage through an isolation transformer;
the three-phase current acquisition module acquires three-phase current through the single-coil current acquisition circuit and outputs three-phase acquired current through the current transformer.
Further, the three-phase voltage acquisition module comprises a first isolation transformer, a second isolation transformer and a third isolation transformer;
the first input ends of the first isolation transformer, the second isolation transformer and the third isolation transformer are respectively connected with the low-voltage ends of the first sampling capacitor, the second sampling capacitor and the third sampling capacitor; the second input ends are respectively connected with each other through a first adjusting resistor, a second adjusting resistor and a third adjusting resistor, and the connecting points which are connected with each other are grounded through an adjusting capacitor;
the high-voltage ends of the first sampling capacitor, the second sampling capacitor and the third sampling capacitor are respectively connected with a three-phase circuit to be tested;
three-phase collected voltages are respectively output between the first output end and the second output end of the first isolation transformer, the second isolation transformer and the third isolation transformer, and the connecting point and the grounding end output zero-sequence voltages.
Further, the three-phase voltage acquisition module further comprises a plurality of first adjusting capacitors, second adjusting capacitors and third adjusting capacitors;
and the first adjusting capacitor, the second adjusting capacitor and the third adjusting capacitor are respectively connected among the first input end and the second input end of the first isolation transformer, the second isolation transformer and the third isolation transformer.
Further, the first input end is a homonymous end of the isolation transformer, and the second input end is a synonym end of the isolation transformer.
Further, the specific difference and the angular difference of the isolation transformer are adjusted through the adjusting resistor and the adjusting capacitor.
Further, the three-phase current acquisition module comprises a first current transformer, a second current transformer and a third current transformer;
and the coils of the first current transformer, the second current transformer and the third current transformer are respectively connected in series on the three-phase line to be tested.
Furthermore, one end of a secondary pin of each of the first current transformer, the second current transformer and the third current transformer is connected to a neutral point through a first sampling resistor, a second sampling resistor and a third sampling resistor, and the other end of the secondary pin is connected to the neutral point through a fourth sampling resistor.
Furthermore, three-phase collected currents are respectively output from one end of a secondary pin of each of the first current transformer, the second current transformer and the third current transformer to a neutral point.
Further, the other ends of the secondary pins of the first current transformer, the second current transformer and the third current transformer coil output zero sequence acquisition current to a neutral point.
According to another aspect of the present invention, there is provided an adjustable voltage and current collecting system, comprising a three-phase line to be measured and an adjustable voltage and current collecting device, wherein the adjustable voltage and current collecting device comprises the adjustable voltage and current collecting device according to the first aspect of the present invention;
the adjustable voltage and current acquisition device is connected with the three-phase line to be detected through a three-phase voltage acquisition module so as to acquire the voltage of the three-phase line to be detected;
the adjustable voltage and current acquisition device is connected with the three-phase line to be detected through the three-phase current acquisition module so as to acquire the current of the three-phase line to be detected.
To sum up, the embodiment of the utility model provides an adjustable voltage and current acquisition device and system, the acquisition device comprises a three-phase voltage acquisition module and a three-phase current acquisition module; the three-phase voltage acquisition module acquires three-phase voltage through a single-capacitor-core high-voltage capacitor acquisition loop and outputs the three-phase acquired voltage through an isolation transformer; the three-phase current acquisition module acquires three-phase current through the single-coil current acquisition circuit and outputs three-phase acquired current through the current transformer. The embodiment of the utility model provides an adjustable voltage electric current collection system and system adopts single-capacitance core high voltage electric capacity collection circuit to gather the three-phase voltage, and wherein the secondary phase voltage is kept apart with secondary zero sequence voltage sampling circuit, avoids signal interference, and secondary phase, zero sequence voltage ratio difference and angular difference all can be adjusted, satisfy 0.2 level measurement requirement; the single-coil current acquisition loop is used for acquiring three-phase current, the sampling resistor is a high-precision resistor with one thousandth of the resistance, and the metering grade meets the requirement of 0.5s grade. The device has the characteristics of small volume, low cost, light weight, low fault risk and high detection precision.
Drawings
Fig. 1 is a block diagram illustrating an adjustable voltage and current collecting apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit structure of a three-phase voltage acquisition module in the adjustable voltage and current acquisition device;
fig. 3 is a schematic circuit structure diagram of a three-phase current collection module in the adjustable voltage current collection device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The following describes the technical solution of the embodiments of the present invention in detail with reference to the accompanying drawings. The embodiment of the utility model provides an adjustable voltage current collection system, the device's constitution block diagram is shown in figure 1, including three-phase voltage collection module and three-phase current collection module.
The three-phase voltage acquisition module acquires three-phase voltage through a single-capacitor-core high-voltage capacitor acquisition loop and outputs the three-phase acquired voltage through an isolation transformer.
The three-phase current acquisition module acquires three-phase current through the single-coil current acquisition circuit and outputs three-phase acquired current through the current transformer.
Fig. 2 shows a schematic circuit structure diagram of a three-phase voltage acquisition module in the adjustable voltage and current acquisition device, and as shown in fig. 2, the three-phase voltage acquisition module includes a first isolation transformer PTA1, a second isolation transformer PTA2, and a third isolation transformer PTA 3. First input terminal IN of first isolation transformer PTA1, second isolation transformer PTA2 and third isolation transformer PTA3 * Low voltage ends of the first sampling capacitor, the second sampling capacitor and the third sampling capacitor (not shown in FIG. 2) are respectively connected; the second input terminal IN is connected to each other through a first adjusting resistor RAL, a second adjusting resistor RBL and a third adjusting resistor RCL, respectively, the interconnected connection point U01 is connected to ground GND through an adjusting capacitor, the number of the adjusting capacitors may be one or more, and fig. 2 shows a schematic diagram with a first adjusting capacitor C1 and a second adjusting capacitor C01.
The high-voltage ends of the first sampling capacitor, the second sampling capacitor and the third sampling capacitor are respectively connected with a three-phase line to be tested; the second output terminals OUT are respectively connected to the GND. First output terminal OUT of first isolation transformer PTA1, second isolation transformer PTA2 and third isolation transformer PTA3 * And three-phase acquisition voltages UA-1, UB-1 and UC-1 are respectively output between the second output end OUT and the connecting point, and zero sequence voltage is output between the connecting point and the ground GND.
The three-phase voltage acquisition module further comprises a plurality of first adjusting capacitors, second adjusting capacitors and third adjusting capacitors, and fig. 2 shows a schematic diagram with 6 first adjusting capacitors, second adjusting capacitors and third adjusting capacitors, wherein the first adjusting capacitors comprise capacitors Ca2, Ca3, Ca4, Ca5, Ca6 and Ca7, the second adjusting capacitors comprise capacitors Cb2, Cb3, Cb4, Cb5, Cb6 and Cb7, and the third adjusting capacitors comprise capacitors Cc2, Cc3, Cc4, Cc5, Cc6 and Cc 7. A plurality of the first adjusting capacitor, the second adjusting capacitor and the third adjusting capacitor are respectively connected with the first input ends IN of the first isolation transformer, the second isolation transformer and the third isolation transformer * And a second input terminal IN. Such asAs shown IN FIG. 2, the first input terminal IN * For example, the homonymous terminal of the isolation transformer, and the second input terminal IN, for example, the synonym terminal of the isolation transformer. The specific difference and the angular difference of the isolation transformer can be adjusted through the adjusting resistor and the adjusting capacitor, and the error can be adjusted to 0.2 level. GND of each isolation transformer can be connected to a pad of a PCB at a mounting position, and when the isolation transformer is mounted on a product, the GND can be conducted with a metal shell of the product to realize grounding.
Fig. 3 is a schematic circuit structure diagram of a three-phase current collection module in the adjustable voltage and current collection device, and as shown in fig. 3, the three-phase current collection module includes a first current transformer, a second current transformer and a third current transformer, and coils of the first current transformer, the second current transformer and the third current transformer are respectively connected in series on a three-phase line to be tested. Secondary pins of the coils of the first current transformer, the second current transformer and the third current transformer are respectively AS1, AS2, BS1, BS2, CS1 and CS2, AS1 is connected to a neutral point ICOM through a first sampling resistor Ra, a first sampling resistor BS1, a second sampling resistor Rb, a second sampling resistor CS1 and a third sampling resistor Rc, and the other ends AS2, a second sampling resistor BS2 and a second sampling resistor CS2 are connected to the neutral point ICOM through a fourth sampling resistor R0. One ends of secondary pins of the first current transformer, the second current transformer and the third current transformer are connected to neutral points AS1-ICOM, BS1-ICOM and CS1-ICOM, and the collected currents of the A phase, the B phase and the C phase are output respectively. And the other ends of the secondary pins of the coils of the first current transformer, the second current transformer and the third current transformer output zero-sequence acquisition current to a neutral point AS2/BS2/CS 2-ICOM. The first sampling resistor Ra, the second sampling resistor Rb, the third sampling resistor Rc and the fourth sampling resistor R0 are all high-precision sampling resistors, and the requirement of 0.5s level can be met without precision adjustment.
The embodiment of the utility model also provides an adjustable voltage and current acquisition system, which comprises a three-phase line to be measured and an adjustable voltage and current acquisition device, wherein the adjustable voltage and current acquisition device comprises the adjustable voltage and current acquisition device in the embodiment;
the adjustable voltage and current acquisition device is connected with the three-phase line to be detected through a three-phase voltage acquisition module so as to acquire the voltage of the three-phase line to be detected;
the adjustable voltage and current acquisition device is connected with the three-phase line to be detected through the three-phase current acquisition module so as to acquire the current of the three-phase line to be detected.
To sum up, the embodiment of the utility model relates to an adjustable voltage and current acquisition device and system, the acquisition device comprises a three-phase voltage acquisition module and a three-phase current acquisition module; the three-phase voltage acquisition module acquires three-phase voltage through a single-capacitor-core high-voltage capacitor acquisition loop and outputs the three-phase acquired voltage through an isolation transformer; the three-phase current acquisition module acquires three-phase current through the single-coil current acquisition circuit and outputs three-phase acquired current through the current transformer. The embodiment of the utility model provides an adjustable voltage electric current collection system and system adopts single-capacitance core high voltage electric capacity collection circuit to gather the three-phase voltage, and wherein the secondary phase voltage is kept apart with secondary zero sequence voltage sampling circuit, avoids signal interference, and secondary phase, zero sequence voltage ratio difference and angular difference all can be adjusted, satisfy 0.2 level measurement requirement; the single-coil current acquisition loop is used for acquiring three-phase current, the sampling resistor is a high-precision resistor with one thousandth of the resistance, and the metering grade meets the requirement of 0.5s grade. The device has the characteristics of small volume, low cost, light weight, low fault risk and high detection precision.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundary of the appended claims, or the equivalents of such scope and boundary.
Claims (10)
1. An adjustable voltage and current acquisition device is characterized by comprising a three-phase voltage acquisition module and a three-phase current acquisition module;
the three-phase voltage acquisition module acquires three-phase voltage through a single-capacitor-core high-voltage capacitor acquisition loop and outputs the three-phase acquired voltage through an isolation transformer;
the three-phase current acquisition module acquires three-phase current through the single-coil current acquisition circuit and outputs three-phase acquired current through the current transformer.
2. The apparatus of claim 1, wherein the three-phase voltage acquisition module comprises a first isolation transformer, a second isolation transformer, and a third isolation transformer;
the first input ends of the first isolation transformer, the second isolation transformer and the third isolation transformer are respectively connected with the low-voltage ends of the first sampling capacitor, the second sampling capacitor and the third sampling capacitor; the second input ends are respectively connected with each other through a first adjusting resistor, a second adjusting resistor and a third adjusting resistor, and the connecting points which are connected with each other are grounded through an adjusting capacitor;
the high-voltage ends of the first sampling capacitor, the second sampling capacitor and the third sampling capacitor are respectively connected with a three-phase line to be tested;
three-phase collected voltages are respectively output between the first output end and the second output end of the first isolation transformer, the second isolation transformer and the third isolation transformer, and the connecting point and the grounding end output zero-sequence voltages.
3. The apparatus of claim 2, wherein the three-phase voltage acquisition module further comprises a plurality of first, second, and third conditioning capacitors;
and the first adjusting capacitor, the second adjusting capacitor and the third adjusting capacitor are respectively connected among the first input end and the second input end of the first isolation transformer, the second isolation transformer and the third isolation transformer.
4. The apparatus of claim 3, wherein the first input terminal is a homonymous terminal of the isolation transformer and the second input terminal is a heteronymous terminal of the isolation transformer.
5. The apparatus of claim 4, wherein the specific difference and angular difference adjustments of the isolation transformer are adjusted by the adjustment resistor and adjustment capacitor.
6. The apparatus of claim 1, wherein the three-phase current acquisition module comprises a first current transformer, a second current transformer, and a third current transformer;
and the coils of the first current transformer, the second current transformer and the third current transformer are respectively connected in series on the three-phase line to be tested.
7. The apparatus of claim 6, wherein the secondary pins of the first, second and third current transformer coils are connected at one end to a neutral point through a first, second and third sampling resistors, respectively, and at the other end to the neutral point through a fourth sampling resistor.
8. The apparatus of claim 7, wherein the secondary pins of the first, second and third current transformer coils respectively output three-phase collected currents from one end to a neutral point.
9. The apparatus of claim 8, wherein the other ends of the secondary pins of the first, second and third current transformer coils output zero sequence pick-up currents to a neutral point.
10. An adjustable voltage and current acquisition system comprising a three-phase line to be tested and an adjustable voltage and current acquisition device, wherein the adjustable voltage and current acquisition device comprises the adjustable voltage and current acquisition device as claimed in any one of claims 1 to 9;
the adjustable voltage and current acquisition device is connected with the three-phase line to be detected through a three-phase voltage acquisition module so as to acquire the voltage of the three-phase line to be detected;
the adjustable voltage and current acquisition device is connected with the three-phase line to be detected through the three-phase current acquisition module so as to acquire the current of the three-phase line to be detected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220588088.3U CN217443437U (en) | 2022-03-16 | 2022-03-16 | Adjustable voltage and current acquisition device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220588088.3U CN217443437U (en) | 2022-03-16 | 2022-03-16 | Adjustable voltage and current acquisition device and system |
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| CN217443437U true CN217443437U (en) | 2022-09-16 |
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