CN216216587U - Three-phase current transformer with high current measurement precision - Google Patents
Three-phase current transformer with high current measurement precision Download PDFInfo
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- CN216216587U CN216216587U CN202122740375.XU CN202122740375U CN216216587U CN 216216587 U CN216216587 U CN 216216587U CN 202122740375 U CN202122740375 U CN 202122740375U CN 216216587 U CN216216587 U CN 216216587U
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Abstract
The utility model provides a three-phase current transformer with high current measurement precision, which can solve the problem that the precision of real-time current measurement in the prior current transformer technology is not very high, and comprises: neutral line half-bridge circuit, with three routes live wire half-bridge circuit that neutral line half-bridge circuit connects gradually in parallel, every live wire half-bridge circuit all is connected with live wire measuring circuit, all is provided with the multirange current measurement spare on every live wire measuring circuit.
Description
Technical Field
The utility model relates to the field of electric circuits, in particular to a three-phase current transformer with high current measurement precision.
Background
In the field of electric energy, a converter is a widely used device for converting electric energy, such as alternating current to direct current, direct current to alternating current, and the like. In the current transformer, real-time voltage measurement and real-time current measurement both belong to critical technologies, which affect the overall performance, such as power conversion efficiency and control stability, and also affect the local power quality.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a three-phase current transformer with high current measurement precision, which can solve the problem that the real-time current measurement precision is not very high in the prior art of current transformers.
The embodiment of the utility model is realized by the following steps:
a three-phase current transformer with high current measurement accuracy, comprising: neutral line half-bridge circuit, with three routes live wire half-bridge circuit that neutral line half-bridge circuit connects gradually in parallel, every live wire half-bridge circuit all is connected with live wire measuring circuit, all is provided with the multirange current measurement spare on every live wire measuring circuit.
In a preferred embodiment of the present invention, the multi-range current measuring device comprises: a combination of multiple current sensors of different ranges or a multi-range current sensor.
In a preferred embodiment of the present invention, the neutral half-bridge circuit comprises: the neutral current sensor comprises a first neutral power assembly, a second neutral power assembly, a neutral inductor, a neutral current sensor, a total positive bus bar, a total negative bus bar, a first capacitor bank, a second capacitor bank and a middle bus bar;
an emitter of the first neutral line power assembly and a collector of the second neutral line power assembly are connected with a neutral line inductor, and the neutral line inductor is connected with a current sensor and then connected to a neutral bus; a collector of the first neutral power component is connected with the total positive bus bar and then is connected into a first capacitor bank, and the first capacitor bank is connected with the middle bus bar;
and an emitter of the second neutral power component is connected with the total negative bus bar and then connected into a second capacitor bank, and the second capacitor bank is connected into the middle bus bar.
In a preferred embodiment of the present invention, the three-way half-bridge circuit includes a first half-bridge circuit, a second half-bridge circuit and a third half-bridge circuit; the live wire measuring circuit comprises a first live wire measuring circuit, a second live wire measuring circuit and a third live wire measuring circuit.
In a preferred embodiment of the present invention, the first half-bridge circuit for power line includes: the measuring circuit comprises a first live wire power component and a second live wire power component, wherein an emitter of the first live wire power component and a collector of the second live wire power component are connected with a first live wire measuring circuit, and the collector of the first live wire power component and the emitter of the second live wire power component are connected into a neutral line half-bridge circuit in parallel.
In a preferred embodiment of the present invention, the second live wire half-bridge circuit includes a third live wire power component and a fourth live wire power component, an emitter of the third live wire power component and a collector of the fourth live wire power component are connected to the second live wire measuring circuit, and a collector of the third live wire power component and an emitter of the fourth live wire power component are connected in parallel to the neutral wire half-bridge circuit.
In a preferred embodiment of the present invention, the third live wire half-bridge circuit includes a fifth live wire power component and a sixth live wire power component, an emitter of the fifth live wire power component and a collector of the sixth live wire power component are connected to the third live wire measuring circuit, and a collector of the fifth live wire power component and an emitter of the sixth live wire power component are connected in parallel to the neutral wire half-bridge circuit.
In a preferred embodiment of the present invention, the first live line measuring circuit includes: the device comprises a first live wire inductor, a first live wire capacitor bank and a first multi-range current measuring piece, wherein an emitting electrode of a first live wire power component and a collecting electrode of a second live wire power component are connected with one end of the first live wire inductor, and the other end of the first live wire inductor is connected with the first live wire capacitor bank and then connected with the first multi-range current measuring piece.
In a preferred embodiment of the present invention, the second live line measuring circuit includes: the second live wire inductor, the second live wire capacitor bank and the second multi-range current measuring component are connected, the emitting electrode of the third live wire power component and the collecting electrode of the fourth live wire power component are connected with one end of the second live wire inductor, and the other end of the second live wire inductor is connected with the second live wire capacitor bank and then connected with the second multi-range current measuring component.
In a preferred embodiment of the present invention, the third live line measuring circuit includes: the emitter of the fifth live wire power component and the collector of the sixth live wire power component are connected with one end of the third live wire inductor, and the other end of the third live wire inductor is connected with the third live wire capacitor group and then connected with the third multi-range current measuring component; the first live wire capacitor group, the second live wire capacitor group and the third live wire capacitor group are connected to the neutral bus.
The embodiment of the utility model has the beneficial effects that: in the three-phase converter, the three live wire half-bridge circuits are connected with the neutral wire half-bridge circuit in parallel to form a three-phase converter full-bridge structure, the three live wire half-bridge circuits are connected with the live wire measuring circuit for monitoring the circuit state in real time, and the live wire measuring circuit is used for completing real-time current measurement by using the multi-range current measuring part, so that the performances of the original converter, such as electric energy conversion efficiency, control stability and the like, are not influenced, and functions of reactive power regulation, harmonic compensation and the like are facilitated to be realized, so that the three-phase converter is more suitable for a medium-power converter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a simplified illustration of a portion of a high voltage circuit of a three-phase inverter according to an embodiment of the present invention;
icon: qNP-a first neutral power assembly; qNN-a second neutral power assembly; l iskN-a neutral line inductor; mN-a neutral current sensor; bus + P-total positive bus;a bus-N-total negative bus; cNP-a first capacitor bank; cNN-a second capacitor bank; x'N-a first neutral terminal; bus _ O-neutral bus;
QUP-a first live power assembly; qUN-a second live power assembly; l iskU-a first live inductor; ckU-a first hot wire capacitor bank; mU-a first multi-range current measuring member; xU-a first live terminal;
QVP-a third live power assembly; qVN-a fourth live power assembly; l iskV-a second live inductor; cKV-a second group of live wire capacitors; mV-a second multi-range current measuring element; xV-a second live terminal;
QWP-a fifth live power assembly; qWN-a sixth live power assembly; l iskW-a third live inductor; cKW-a third group of live wire capacitors; mW-a third multi-range current measuring element; xW-a third live terminal.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in one or more hardware components.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the disclosed concept. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
First embodiment
Referring to fig. 1, a three-phase current transformer with high current measurement accuracy in the present embodiment includes: neutral line half-bridge circuit, with three routes live wire half-bridge circuit that neutral line half-bridge circuit connects gradually in parallel, every live wire half-bridge circuit all is connected with live wire measuring circuit, all is provided with the multirange current measurement spare on every live wire measuring circuit. The multi-range current measuring element in this embodiment is: a combination of multiple current sensors of different ranges or a multi-range current sensor. For example, a double-range Hall current sensor DHAB S/118 is selected, the smaller range is-30 to +30 amperes, the larger range is-350 to +350 amperes, and the errors are respectively about +/-1 percent, so that the errors of measurement (in the larger range) can be obtained by combining about +/-1 percent. The hall current sensor DHAB S/118 is coupled to the weak current portion with only one 4-wire harness. As with conventional measurement tools, in implementations, the combination of two sensors with different measurement ranges requires calibration, as does a dual range sensor. The delay time of the electrical signal is very short and negligible, but the signals that go out of range and return to range all require a certain setup time, so calibration is a combination of current strength and time parameters, and requires a combination of hardware and software. Fig. 1 does not contain the weak current and software parts (real-time parameters and programs, etc.) of the converter.
More specifically, the three-phase converter full-bridge structure of simplifying comprises central line half-bridge and three live wire half-bridges etc. and central line half-bridge circuit includes: first neutral power component QNPA second neutral power component QNNNeutral line inductor LkNNeutral current sensor MNA total positive bus bar (bus + P), a total negative bus bar (bus-N), a first capacitor group (C)NPA second capacitor bank CNNAnd a first neutral line terminal X'NAnd a middle bus _ O.
The neutral half-bridge circuit is connected as follows: first neutral power component QNPEmitter and second neutral power component QNNCollector of which is connected to a neutral inductor LkNNeutral line inductor LkNConnecting neutral current sensor MNThen the neutral wire terminal is connected; first neutral power component QNPThe collector electrode of the capacitor is connected with the total positive bus bar bus + P and then connected with the first capacitor bank CNPA first capacitor bank CNPA first neutral wire terminal X 'is accessed after the middle bus bar bus _ O is connected'N(ii) a Second neutral power component QNNThe emitter of the first capacitor bank is connected with the total negative bus bar bus-N and then connected with the second capacitor bank CNNA second capacitor bank CNNA first neutral wire terminal X 'is accessed after a middle bus bar bus _ O is accessed'N。
More specifically, the three-way live wire half-bridge circuit comprises a first live wire half-bridge circuit, a second live wire half-bridge circuit and a third live wire half-bridge circuit; the live wire measuring circuit comprises a first live wire measuring circuit, a second live wire measuring circuit and a third live wire measuring circuit.
In this embodiment, the first live half-bridge circuit includes: first live wire power component QUPA second live wire power component QUNFirst live wire power component QUPEmitter and second hot line power component QUNThe collector electrode of the power module is connected with a first live wire measuring circuit and a first live wire power component QUPCollector and second live line power component QUNIs connected in parallel to the neutral half-bridge circuit.
More specifically, the first live wire measurement circuit includes: first live wire inductor LkUA first hot wire capacitor group CkUA first multi-range current measuring member MUFirst live wire power component QUPEmitter and second hot line power component QUNIs connected to the first live inductor LkUOne end, first live wire inductor LkUThe other end of the first multi-range current measuring part MUIs connected to a first live wire terminal XUFirst hot wire capacitor group CkUAre respectively connected with a second neutral line terminal X at two endsNAnd a first live inductor LkU。
In this embodiment, the second live half-bridge circuit comprises a third live power component QVPAnd a fourth live wire power component QVNThird live wire power component QVPEmitter and fourth line power component QVNThe collector of the power module is connected with a second live wire measuring circuit and a third live wire power component QVPCollector and fourth live line power component QVNIs connected in parallel to the neutral half-bridge circuit.
Specifically, the second live wire measurement circuit includes: second live wire inductor LkVA second hot wire capacitor group CKVA second multi-range current measuring part MVThird live wire power component QVPEmitter and fourth line power component QVNIs connected to the second live inductor LkVOne-end, second line inductor LkVThe other end of the first resistor is passed through a second multi-range currentMeasuring part MVConnecting to a second live wire terminal XVA second hot wire capacitor group CKVAre respectively connected with a second live wire inductor LkVAnd a second neutral terminal XN。
In this embodiment, the third live line half-bridge circuit comprises a fifth live line power component QWPAnd a sixth live wire power component QWNFifth live wire power component QWPEmitter and sixth line power component QWNThe collector of the power module is connected with a third live wire measuring circuit and a fifth live wire power component QWPCollector and sixth live line power component QWNIs connected in parallel to the neutral half-bridge circuit.
Specifically, the third live wire measuring circuit includes: third live wire inductor LkWA third hot wire capacitor group CKWAnd a third multi-range current measuring part MWFifth live wire power component QWPEmitter and sixth line power component QWNIs connected to a third live inductor LkWOne end of the third wire inductor and the other end of the third wire inductor pass through a third multi-range current measuring part MWConnecting to a third live wire terminal XW(ii) a Third live wire capacitor group CKWAre respectively connected with a third live wire inductor LkWAnd a second neutral terminal XN. First hot wire capacitor group CkUA second hot wire capacitor group CKVAnd a third hot wire capacitor group CKWIs connected to a second neutral line terminal X through a middle bus bar bus _ ON。
The power component in this embodiment is a semiconductor power module, or a power device IGBT group and its driving circuit, etc.
In summary, the present invention discloses a converter with improved current measurement accuracy, which can utilize most of the existing converters with medium power, and the cost of updating is not high, so as to not hinder the performance of the original converter, such as power conversion efficiency and control stability, and is helpful to realize the functions of reactive power regulation and harmonic compensation, i.e. to improve the local power quality.
This description describes examples of embodiments of the utility model, and is not intended to illustrate and describe all possible forms of the utility model. It should be understood that the embodiments described in this specification can be implemented in many alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Specific structural and functional details disclosed are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention. It will be appreciated by persons skilled in the art that a plurality of features illustrated and described with reference to any one of the figures may be combined with features illustrated in one or more other figures to form embodiments which are not explicitly illustrated or described. The described combination of features provides a representative embodiment for a typical application. However, various combinations and modifications of the features consistent with the teachings of the present invention may be used as desired for particular applications or implementations.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. All such equivalents and modifications as fall within the true spirit and scope of the utility model are deemed to be within the scope and spirit of the utility model.
Claims (10)
1. A three-phase current transformer with high current measurement accuracy, comprising: neutral line half-bridge circuit, with neutral line half-bridge circuit connects gradually parallelly connected three routes live wire half-bridge circuit, every live wire half-bridge circuit all is connected with live wire measuring circuit, every all be provided with the multirange current measurement spare on the live wire measuring circuit.
2. The three-phase current transformer of claim 1, wherein the multi-range current measuring element is: a combination of multiple current sensors of different ranges or a multi-range current sensor.
3. The three-phase current transformer of claim 1, wherein the neutral half-bridge circuit comprises: the neutral current sensor comprises a first neutral power assembly, a second neutral power assembly, a neutral inductor, a neutral current sensor, a total positive bus bar, a total negative bus bar, a first capacitor bank, a second capacitor bank and a middle bus bar;
the emitter of the first neutral line power assembly and the collector of the second neutral line power assembly are connected with the neutral line inductor, and the neutral line inductor is connected with the current sensor and then connected to the neutral bus; a collector of the first neutral power assembly is connected with a total positive bus bar and then is connected into a first capacitor bank, and the first capacitor bank is connected with the middle bus bar; and an emitter of the second neutral power component is connected with the total negative bus bar and then is connected into a second capacitor bank, and the second capacitor bank is connected into the middle bus bar.
4. The three-phase current transformer with high current measurement accuracy according to claim 3, wherein the three live wire half-bridge circuits comprise a first live wire half-bridge circuit, a second live wire half-bridge circuit and a third live wire half-bridge circuit; the live wire measuring circuit comprises a first live wire measuring circuit, a second live wire measuring circuit and a third live wire measuring circuit.
5. The three-phase current transformer with high current measurement accuracy according to claim 4, wherein the first live wire half-bridge circuit comprises: the measuring circuit comprises a first live wire power component and a second live wire power component, wherein an emitter of the first live wire power component and a collector of the second live wire power component are connected with the first live wire measuring circuit, and a collector of the first live wire power component and an emitter of the second live wire power component are connected into the neutral half-bridge circuit in parallel.
6. The three-phase current transformer with high current measurement accuracy according to claim 5, wherein the first live wire measurement circuit comprises: the device comprises a first live wire inductor, a first live wire capacitor group and a first multi-range current measuring piece, wherein an emitting electrode of the first live wire power component and a collecting electrode of the second live wire power component are connected with one end of the first live wire inductor, and the other end of the first live wire inductor is connected with the first multi-range current measuring piece.
7. The three-phase current transformer with high current measurement accuracy as claimed in claim 6, wherein the second live wire half-bridge circuit comprises a third live wire power component and a fourth live wire power component, an emitter of the third live wire power component and a collector of the fourth live wire power component are connected to the second live wire measurement circuit, and a collector of the third live wire power component and an emitter of the fourth live wire power component are connected in parallel to the neutral wire half-bridge circuit.
8. The current source of claim 7, wherein the second live line measurement circuit comprises: the device comprises a second live wire inductor, a second live wire capacitor group and a second multi-range current measuring piece, wherein an emitting electrode of the third live wire power component and a collecting electrode of the fourth live wire power component are connected with one end of the second live wire inductor, and the other end of the second live wire inductor is connected with the second multi-range current measuring piece.
9. The three-phase current transformer with high current measurement accuracy according to claim 8, wherein the third live wire half-bridge circuit comprises a fifth live wire power component and a sixth live wire power component, an emitter of the fifth live wire power component and a collector of the sixth live wire power component are connected to the third live wire measurement circuit, and a collector of the fifth live wire power component and an emitter of the sixth live wire power component are connected in parallel to the neutral wire half-bridge circuit.
10. The three-phase current transformer of claim 9, wherein the third live line measurement circuit comprises: the emitter of the fifth live wire power component and the collector of the sixth live wire power component are connected with one end of the third live wire inductor, and the other end of the third live wire inductor is connected with the third multi-range current measuring component; the first live wire capacitor group, the second live wire capacitor group and the third live wire capacitor group are connected to the neutral bus together.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122740375.XU CN216216587U (en) | 2021-11-10 | 2021-11-10 | Three-phase current transformer with high current measurement precision |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122740375.XU CN216216587U (en) | 2021-11-10 | 2021-11-10 | Three-phase current transformer with high current measurement precision |
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| CN216216587U true CN216216587U (en) | 2022-04-05 |
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