CN213986616U - Zero sequence voltage detection device - Google Patents

Zero sequence voltage detection device Download PDF

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Publication number
CN213986616U
CN213986616U CN202022605532.1U CN202022605532U CN213986616U CN 213986616 U CN213986616 U CN 213986616U CN 202022605532 U CN202022605532 U CN 202022605532U CN 213986616 U CN213986616 U CN 213986616U
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China
Prior art keywords
capacitor
voltage
phase
zero sequence
zero
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CN202022605532.1U
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Chinese (zh)
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杨爱军
燕琳伟
康维军
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Zhuhai Galaxy Smart Grid Co ltd
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Zhuhai Galaxy Smart Grid Co ltd
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Abstract

The utility model discloses a zero sequence voltage detection device, including setting up the zero sequence voltage detection subassembly inside the casing subassembly, the zero sequence voltage detection subassembly includes: the capacitor core comprises a first capacitor, a second capacitor and a third capacitor, and the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor are connected in parallel to form a first node; one end of the zero-sequence capacitor is connected to the first node, and the other end of the zero-sequence capacitor is connected to the ground; and the primary winding of the isolation transformer is connected with the zero sequence capacitor. The utility model discloses an electric capacity core acquires three-phase voltage to utilize zero sequence electric capacity and isolation transformer to detect zero sequence voltage according to the vector sum of three-phase voltage, have characteristics small, light in weight, easily installation and maintenance. The utility model discloses can wide application in ground fault detection technical field.

Description

Zero sequence voltage detection device
Technical Field
The utility model relates to a ground fault detects technical field, especially relates to a zero sequence voltage detection device.
Background
In the prior art, the device for measuring the zero sequence voltage of the outdoor 10kV line is generally a traditional three-phase electromagnetic voltage transformer, which generally includes a primary winding, a secondary winding and an iron core. The secondary windings are connected end to end in sequence without forming a closed loop, the open voltage is equal to the vector sum of three-phase voltages, under the normal condition, the open delta output voltage is zero, and when single-phase grounding occurs, the vector sum of the three-phase voltages is equal toThe double line voltage, i.e. the zero sequence voltage is generated.
In addition, because an iron core structure exists in the three-phase electromagnetic voltage transformer, ferromagnetic resonance overvoltage is easily generated, and when overvoltage is generated, the excitation current of a winding of the three-phase electromagnetic voltage transformer is greatly increased due to the saturation of the iron core of the three-phase electromagnetic voltage transformer, so that the operation safety of equipment and a power grid is influenced. And the traditional electric three-phase electromagnetic voltage transformer is difficult to install due to large volume and heavy weight, and the workload of later maintenance is large.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims to provide a: a zero sequence voltage detection device is provided.
The utility model adopts the technical proposal that:
a zero sequence voltage detection apparatus comprising a zero sequence voltage detection assembly disposed inside a housing assembly, the zero sequence voltage detection assembly comprising:
the capacitor comprises a capacitor core, a first capacitor, a second capacitor and a third capacitor, wherein one end of the first capacitor is connected with a first phase of three-phase alternating-current voltage, one end of the second capacitor is connected with a second phase of the three-phase alternating-current voltage, and one end of the third capacitor is connected with a third phase of the three-phase alternating-current voltage;
the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor are connected in parallel to form a first node;
one end of the zero-sequence capacitor is connected to the first node, and the other end of the zero-sequence capacitor is connected to the ground;
and the primary winding of the isolation transformer is connected with the zero sequence capacitor.
Further, the one end of casing subassembly is provided with the high pressure inserts, the high pressure inserts includes:
a first terminal connected to one end of the first capacitor, the other end of the first terminal being further connected to a first phase of the three-phase ac voltage;
a second terminal connected to one end of the second capacitor, the other end of the first terminal being further connected to a second phase of the three-phase ac voltage;
and a third terminal connected to one end of the third capacitor, and the other end of the first terminal is further connected to a third phase of the three-phase ac voltage.
Further, the other end of the shell assembly is further provided with a containing cavity, and the containing cavity is used for containing the zero sequence capacitor and the isolation transformer.
Further, the containing cavity is further provided with a low-voltage insert, the low-voltage insert is connected to the first node, and the low-voltage insert is further connected to one end of the zero sequence capacitor.
Furthermore, a shielding layer is arranged outside the zero sequence voltage detection assembly.
Further, the first capacitor, the second capacitor, the third capacitor and the zero-sequence voltage capacitor are all ceramic capacitors.
Further, the housing assembly includes a housing.
Further, the housing assembly further comprises a filler.
The utility model has the advantages that: the three-phase voltage is obtained through the capacitor core, the zero-sequence voltage is detected according to the vector sum of the three-phase voltage by utilizing the zero-sequence capacitor and the isolation transformer, the three-phase voltage detection circuit has the characteristics of small volume and light weight, and is easy to install and maintain.
Drawings
Fig. 1 is a schematic structural diagram of a zero sequence voltage detection apparatus in the related art;
fig. 2 is a schematic circuit diagram of a zero sequence voltage detection apparatus of the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present application, preferred embodiments of which are illustrated in the accompanying drawings, which are for the purpose of visually supplementing the description with figures and detailed description, so as to enable a person skilled in the art to visually and visually understand each and every feature and technical solution of the present application, but not to limit the scope of the present application.
In the present application, if directions (up, down, left, right, front, and rear) are described, it is only for convenience of describing the technical aspects of the present application, and it is not intended or implied that the technical features referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
In the present application, "a plurality" means one or more, "a plurality" means two or more, "more than", "less than", "more than" and the like are understood as excluding the number; the terms "above", "below", "within" and the like are understood to include the instant numbers. In the description of the present application, the descriptions of "first" and "second" are only used for distinguishing technical features, but are not understood to indicate or imply relative importance or implicitly indicate the number of the indicated technical features or implicitly indicate the precedence of the indicated technical features.
In this application, unless explicitly defined otherwise, the terms "disposed," "mounted," "connected," and the like are to be construed broadly, e.g., directly connected or indirectly connected through intervening media; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be mechanically coupled, may be electrically coupled or may be capable of communicating with each other; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above-mentioned words in this application can be reasonably determined by those skilled in the art in combination with the details of the technical solution.
The invention will be further explained and explained with reference to the drawings and the embodiments in the description.
To at least partially solve one of the above problems, referring to fig. 1 and 2, the present invention provides a zero sequence voltage detecting apparatus including a zero sequence voltage detecting assembly disposed inside a casing assembly, the zero sequence voltage detecting assembly including:
a capacitor core 1, the capacitor core 1 including a first capacitor C1A second capacitor C2And a third capacitance C3First capacitor C1Is connected to a first phase of a three-phase alternating voltage, a second capacitor C2Is connected to a second phase of the three-phase alternating voltage, a third capacitor C3One end of which is connected to a third phase of the three-phase alternating voltage;
a first capacitor C1Another terminal of (1), a second capacitor C2Is connected to a third capacitor C at the other end3The other ends of the first and second nodes are connected in parallel to form a first node M;
zero sequence capacitor C4Zero sequence capacitance C4Is connected to a first node M, a zero sequence capacitor C4The other end of the first and second switches is connected to ground GND;
isolation transformer trans, primary winding and zero sequence capacitor C of isolation transformer trans4Are connected.
Specifically, the three capacitors of the capacitor core 1 are connected with the three-phase alternating-current voltage on the high-voltage line to obtain the three-phase voltage, the three-phase voltage values of the three-phase alternating-current voltage are equal, the phase difference sequentially differs by 120 degrees, therefore, if the three-phase alternating-current voltage does not have single-phase grounding fault, the three capacitors of the capacitor core 1 obtain the three-phase voltage with equal magnitude, the phase difference once differs by 120 degrees, the vector sum of the three-phase voltage is 0, and the zero-sequence capacitor C is used4One end of and a capacitor coreThe first node M of the sub-1 is connected with a zero sequence capacitor C4Is grounded, thus, a zero sequence capacitor C4The voltage value at both ends of the isolation transformer trans is 0, then the primary winding of the isolation transformer trans has no voltage input, and therefore, the control end connected to the secondary winding of the isolation transformer trans cannot detect the voltage value, that is, there is no zero sequence voltage. The isolation transformer trans is not only used for transforming voltage, but also can isolate the high-voltage side where the primary winding is located from the low-voltage side where the secondary winding is located, so that the control terminal fault caused by the fact that high voltage enters the control terminal when the single-phase earth fault is generated is avoided.
Once a single-phase earth fault occurs to the three-phase alternating voltage, the vector sum of the three-phase voltages detected by the capacitor core 1 is not 0, the voltage value at the first node M is not 0, and then the zero-sequence capacitor C4When the voltages at the two ends are not 0, the voltages are input to the primary winding of the isolation transformer trans, and the control end connected with the complex winding of the isolation transformer trans can detect the zero sequence voltage.
From the above, the present application can obtain three-phase voltages of three-phase ac voltages by using the capacitor core 1 and by using the zero-sequence capacitor C4The vector sum of the three-phase voltages is obtained, and the isolation transformer trans judges whether zero-sequence voltage exists or not by utilizing the vector sum, so that whether single-phase earth fault exists or not in the three-phase alternating-current voltage is judged.
Compared with the prior art that a three-phase electromagnetic voltage transformer is used for detecting whether a single-phase earth fault exists or not, the zero-sequence voltage detection device has the advantages of small size and light weight, and is easy to install and maintain; and because no iron core structure is adopted, the phenomenon that excitation current is increased too much due to ferromagnetic resonance overvoltage is avoided, and the potential safety hazard of equipment and a power grid is eliminated.
As further optional implementation, one end of the housing assembly is provided with a high-pressure insert 2, and the high-pressure insert 2 includes:
a first terminal, a first terminal and a first capacitor C1Is connected to the other end of the first terminal, and is also connected to a first phase of the three-phase ac voltage;
second endA second terminal and a second capacitor C2One end of the first terminal is connected, and the other end of the first terminal is also connected with a second phase of the three-phase alternating-current voltage;
a third terminal, a third terminal and a third capacitor C3Is connected to the other end of the first terminal, and is also connected to a third phase of the three-phase ac voltage.
Specifically, this application has set up high-pressure inserts 2 in housing assembly's one end, and this high-pressure inserts 2 is high-pressure copper inserts, easily electrically conducts, includes three terminal moreover, and three terminal is connected with 10kV overhead line's three-phase voltage respectively to the electric capacity core 1 that three-phase voltage introduced.
Further as an optional implementation mode, the other end of the casing assembly is further provided with a containing cavity 3, and the containing cavity 3 is used for placing a zero sequence capacitor C4And an isolation transformer trans.
Specifically, the other end of the shell assembly of the present application is further provided with a storage cavity 3, and the zero sequence capacitor C can be stored by utilizing the storage cavity 34And an isolation transformer trans.
Further as an optional embodiment, the receiving cavity 3 is further provided with a low-voltage insert 4, the low-voltage insert 4 is connected to the first node M, and the low-voltage insert 4 is further connected to the zero-sequence capacitor C4To one end of (a).
Specifically, a low-voltage insert 4 is arranged on the containing cavity 3, the low-voltage insert 4 is a low-voltage copper insert, and the low-voltage insert 4 is used for connecting the capacitor core 1 and the zero-sequence capacitor C4Are connected together. In addition, still be provided with installation inserts 5 on accomodating the chamber 3, this installation inserts 5 is used for fixing whole zero sequence voltage detection device on transmission line's shaft tower installation base.
Further as an alternative embodiment, a shielding layer 6 (not shown in fig. 1, the shielding layer 6 is shown in fig. 2) is further disposed outside the zero sequence voltage detection assembly.
Specifically, referring to fig. 2, the zero sequence voltage detection assembly comprises a capacitor core 1 and a zero sequence capacitor C4And an isolation transformer trans, and a shielding layer 6 is provided outside these electronic devices and equipments, thereby shielding external interference. The shielding layer 6 may be made of goldThe metal shell is grounded.
Further as an alternative embodiment, the first capacitor C1A second capacitor C2A third capacitor C3And the zero sequence voltage capacitor is a ceramic capacitor.
Specifically, the ceramic capacitor has the characteristics of small volume, high voltage resistance and high precision, and can meet the requirement of higher-level voltage protection.
Further as an alternative embodiment, the housing assembly comprises a housing 7.
Specifically, the shell 7 of the shell assembly is made of silicon rubber, and the hydrophobicity of the silicon rubber can prevent water from accumulating in the shell 7, so that the shell assembly has a good waterproof effect.
As a further alternative embodiment, the housing assembly further comprises a filler 8.
Specifically, the filler 8 of the housing assembly is used for fixing the positions of the capacitor core 1 and other parts, and has the functions of fixing and preventing movement, and when the filler 8 is filled with epoxy resin, the filler 8 also has the function of insulating each electronic device and parts from each other.
In order to more clearly illustrate the implementation principle of the present application, the present application provides another embodiment, which is mainly used for providing a specific application scenario.
The fixing support provided with the zero sequence voltage detection device is fixed on a pole tower of a 10kV overhead line, a three-phase overhead bare conductor of the 10kV line is connected with three terminals of a high-voltage insert, so that three-phase alternating current voltage is introduced into a capacitor core 1, three capacitors of the capacitor core 1 acquire three-phase voltage, and two ends of the zero sequence capacitor are detected by using an isolation transformer trans, so that whether the zero sequence capacitor occurs or not is determined, when the voltage value of two ends of the zero sequence capacitor is detected to be 0, the current 10kV line is normal, when the voltage value of two ends of the zero sequence capacitor is detected to be not 0, the zero sequence voltage is also generated, and then the single-phase grounding fault occurs in the 10kV line.
The zero sequence voltage detection device composed of the capacitor core 1, the zero sequence capacitor and the isolation transformer trans is adopted to replace the traditional three-phase electromagnetic voltage transformer, the low-voltage zero sequence voltage detection device has the characteristics of small volume and light weight, and is convenient to install and maintain.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims (8)

1. A zero sequence voltage detection device, characterized by, including setting up the zero sequence voltage detection subassembly in casing subassembly inside, the zero sequence voltage detection subassembly includes:
the capacitor comprises a capacitor core, a first capacitor, a second capacitor and a third capacitor, wherein one end of the first capacitor is connected with a first phase of three-phase alternating-current voltage, one end of the second capacitor is connected with a second phase of the three-phase alternating-current voltage, and one end of the third capacitor is connected with a third phase of the three-phase alternating-current voltage;
the other end of the first capacitor, the other end of the second capacitor and the other end of the third capacitor are connected in parallel to form a first node;
one end of the zero-sequence capacitor is connected to the first node, and the other end of the zero-sequence capacitor is connected to the ground;
and the primary winding of the isolation transformer is connected with the zero sequence capacitor.
2. The zero sequence voltage detection device according to claim 1, wherein one end of the housing assembly is provided with a high voltage insert, and the high voltage insert comprises:
a first terminal connected to one end of the first capacitor, the other end of the first terminal being further connected to a first phase of the three-phase ac voltage;
a second terminal connected to one end of the second capacitor, the other end of the first terminal being further connected to a second phase of the three-phase ac voltage;
and a third terminal connected to one end of the third capacitor, and the other end of the first terminal is further connected to a third phase of the three-phase ac voltage.
3. The zero sequence voltage detection device according to claim 1, wherein a receiving cavity is further disposed at the other end of the housing assembly, and the receiving cavity is used for placing the zero sequence capacitor and the isolation transformer therein.
4. The zero sequence voltage detection device according to claim 3, wherein the receiving cavity is further provided with a low voltage insert, the low voltage insert is connected to the first node, and the low voltage insert is further connected to one end of the zero sequence capacitor.
5. The zero sequence voltage detection apparatus according to claim 1, wherein a shielding layer is further disposed outside the zero sequence voltage detection assembly.
6. The zero-sequence voltage detection device of claim 1, wherein the first capacitor, the second capacitor, the third capacitor and the zero-sequence voltage capacitor are all ceramic capacitors.
7. The zero sequence voltage detection device of any one of claims 1 to 6, wherein the housing assembly comprises a housing.
8. The zero sequence voltage detection device of any one of claims 1 to 6, wherein the housing assembly further comprises a filler.
CN202022605532.1U 2020-11-11 2020-11-11 Zero sequence voltage detection device Active CN213986616U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022605532.1U CN213986616U (en) 2020-11-11 2020-11-11 Zero sequence voltage detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022605532.1U CN213986616U (en) 2020-11-11 2020-11-11 Zero sequence voltage detection device

Publications (1)

Publication Number Publication Date
CN213986616U true CN213986616U (en) 2021-08-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN213986616U (en)

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