CN115480096A - Electrical engineering broadband voltage online monitoring device with insulation gap and method - Google Patents
Electrical engineering broadband voltage online monitoring device with insulation gap and method Download PDFInfo
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Abstract
The invention discloses an electrotechnical broadband voltage online monitoring device with an insulation gap and a method thereof, wherein the device comprises a high-voltage arm, a low-voltage arm voltage division loop and a digital signal processing unit which are hermetically arranged in an insulation cavity; the high-voltage arm and the low-voltage arm form a voltage division structure after voltage division loops are connected in series, and the voltage division structure is connected between a high-voltage terminal and a grounding terminal of the monitoring device; the high-voltage arm adopts a capacitor formed by a gas insulation gap; the low-voltage arm voltage division loop adopts a resistance-capacitance circuit to divide the high voltage on the high-voltage arm and input the divided measurement result analog signal to the digital signal processing unit; and the digital signal processing unit processes the analog signal to obtain a digital signal. Based on the electrical engineering principle, the invention adopts the gas insulation gap capacitor as the high-voltage arm, adopts the resistance-capacitance circuit as the low-voltage arm to carry out high-voltage division, and combines the digital processing technology to realize safe, reliable and high-precision wideband voltage digital measurement.
Description
Technical Field
The invention relates to the technical field of electrotechnical broadband voltage measurement, in particular to an electrotechnical broadband voltage online monitoring device with an insulation gap and a method.
Background
Along with the construction of novel power systems, the double-height characteristic of the power grid is increasingly highlighted. The access of a large number of power electronic devices, renewable energy sources, nonlinear loads and the like makes harmonic phenomena and transient processes more severe and frequent. The resulting grid faults and equipment damage are rare.
The method can accurately measure the broadband voltage signals covering power frequency, harmonic waves and transient states, and can be widely used for dynamic monitoring and treatment of power grid harmonic waves, accurate positioning and identification of power grid faults, evaluation of the running state of power equipment and the like. The traditional voltage measurement concept only aiming at power frequency signals cannot meet the urgent need of carrying out broadband perception on voltage signals by a novel power system. At present, a general voltage transformer in a transformer substation is mainly used for accurately measuring power frequency signals, is narrow in bandwidth and low in sampling rate, and has serious waveform distortion when being used for measuring harmonic signals or high-frequency transient signals. For example: the capacitance voltage transformer measures 50Hz signals accurately (0.2 grade), and a secondary loop enhances the 50Hz signals by adopting a resonance principle, so that other frequency band signals are seriously distorted.
Currently, various broadband voltage measurement techniques have been proposed, which mainly include:
(1) A resistance-capacitance voltage divider formed by a resistor and a capacitor series-parallel circuit is adopted for broadband voltage measurement. The main technical characteristic is that the whole voltage division loop is composed of a plurality of series-parallel resistor and capacitor loops, and belongs to the traditional resistance-capacitance voltage divider structure. However, this technique has the following drawbacks: when high voltage measurement is carried out, continuous current passes through the voltage divider due to the application of high voltage, so that the voltage divider continuously generates heat, the service life of internal elements is easily shortened due to the temperature rise, and the method is generally used for short-time measurement in a laboratory and is not suitable for outdoor online monitoring; secondly, during measurement, the high potential and the ground potential are isolated by the resistor and the capacitor of the voltage divider, so that the high potential and the ground potential are short-circuited once the resistor and the capacitor are damaged or other internal short circuits occur, and if the high potential and the ground potential are used for measurement in an actual power grid, a power grid short-circuit fault is caused; and thirdly, a voltage division loop consisting of dozens of or even hundreds of resistor capacitors inevitably connects with an inductor, so that the high-frequency response characteristic of the voltage divider is reduced.
(2) A zinc oxide lightning arrester with nonlinear volt-ampere characteristics is used as a main body of the voltage divider to measure broadband voltage. Besides the potential short circuit safety hazard existing in the resistor-capacitor voltage divider, the measurement precision of the broadband voltage monitoring device is difficult to accurately evaluate due to the nonlinear characteristic of the valve plate of the zinc oxide arrester.
(3) Non-contact high voltage measurement technology based on optical electric field sensors. The method is mainly technically characterized in that an optical electric field sensor is used for measuring an electric field generated by high voltage so as to invert voltage waveform, and the sensor does not need to be directly connected with a high-voltage conductor due to the fact that a space electric field is measured, so that non-contact voltage measurement is realized. The non-contact type voltage divider has good safety, and when field voltage measurement is carried out, the failure of the tested power grid caused by the problem of a measurement system can be avoided, so that the non-contact type voltage divider has the main advantage compared with the traditional voltage divider. However, it has the following problems: firstly, due to the adoption of non-contact measurement, the measurement result of the sensor is easy to introduce a large amount of external interference, such as an electric field generated by the voltage of a non-measured conductor, electromagnetic interference introduced by corona discharge and the like, and the problems cause that the measurement accuracy and the uncertainty of the non-contact measurement are often difficult to evaluate, thereby reducing the accuracy and the reliability of the measurement; second, the scale factor of the monitoring device is greatly affected by the installation position, and therefore the scale factor of the monitoring device needs to be recalibrated after changing the position each time. In addition, the scale factor of the monitoring device is also often influenced by the air medium of the environment where the monitoring device is located, and the scale factor change is influenced by the humidity and the nonuniformity of the air medium, so that the scale factor of the monitoring device is usually not fixed and needs to be calibrated in real time. Thereby reducing the convenience and efficiency of the measurement. Thirdly, the optical electric field sensor is relatively fragile, relatively expensive and relatively long in manufacturing period, so that large-scale popularization of the optical electric field sensor is restricted.
Disclosure of Invention
The invention provides an electrotechnical broadband voltage online monitoring device with an insulation gap, aiming at solving the problems of potential safety hazard, poor measurement precision and reliability and the like in the existing broadband voltage measurement technology. Based on the electrical engineering principle, the invention adopts the gas insulation gap capacitor as the high-voltage arm, adopts the resistance-capacitance circuit as the low-voltage arm to carry out high-voltage division, and combines the digital processing technology to realize safe, reliable and high-precision wideband voltage digital measurement.
The invention is realized by the following technical scheme:
an electrotechnical broadband voltage on-line monitoring device with an insulation gap comprises: the high-voltage arm, the low-voltage arm voltage division loop and the digital signal processing unit are hermetically arranged in the insulating cavity;
the high-voltage arm and the low-voltage arm are connected in series to form a voltage dividing structure, and the voltage dividing structure is connected between a high-voltage terminal and a grounding terminal of the monitoring device;
the high-voltage arm adopts a capacitor formed by a gas insulation gap;
the low-voltage arm voltage division loop adopts a resistance-capacitance circuit, divides the high voltage on the high-voltage arm and inputs a broadband high-voltage measurement result analog signal after voltage division to the digital signal processing unit;
and the digital signal processing unit processes the analog signal of the broadband high voltage measurement result to obtain a digital signal of the broadband voltage measurement result.
Based on the electrical engineering principle, the invention adopts the gas insulation gap capacitor as the high-voltage arm, the resistance-capacitance circuit as the low-voltage arm to carry out high-voltage division, and utilizes the digital processing technology to directly convert the voltage measurement result analog signal after voltage division output by the low-voltage arm into the digital signal in the monitoring device, thereby realizing safe, reliable and high-precision wideband high-voltage digital measurement. Meanwhile, the voltage dividing structure of the invention has obvious open circuit, so that the monitoring device only passes through extremely low leakage current under the action of normal power frequency voltage, the heat productivity of the whole device is extremely low, and in addition, even if the resistance and the capacitance of the low-voltage arm are damaged, a short-circuit channel penetrating through the high-voltage end and the grounding end cannot be generated due to the existence of an insulating gap, therefore, the safety is high when the voltage dividing structure is used for outdoor online monitoring.
In a preferred embodiment, the high-voltage arm of the present invention has a capacitor structure formed by a high-voltage arm upper electrode, a high-voltage arm lower electrode, and an insulating gas therebetween;
the upper end of the upper electrode of the high-voltage arm is connected with the high-voltage terminal into a whole, and the lower end part of the upper electrode of the high-voltage arm is a disc with a chamfered edge;
the insulating gas is filled in the whole cavity in the insulating cavity;
the high-voltage arm lower electrode is connected with the low-voltage arm voltage division loop, and the upper end part of the high-voltage arm lower electrode is a disc with a chamfered edge;
and the high-voltage arm lower electrode is connected with the low-voltage arm voltage division loop.
The high-voltage arm only has one insulating gas capacitor, and the inductance is extremely low, so that the high-frequency response characteristic of the device is improved.
The chamfer angles are arranged on the edges of the lower end part of the upper electrode of the high-voltage arm and the upper end part of the lower electrode of the high-voltage arm, so that surface corona discharge is prevented from being generated under the action of high voltage, and the accuracy and the reliability of measurement are improved.
As a preferred embodiment, the high-voltage arm upper electrode and the high-voltage arm lower electrode of the present invention are both made of a metal material.
As a preferred embodiment, the insulating gas of the present invention is dry air, SF6 gas, CO2 gas, or a mixed gas;
the insulating gas pressure is standard atmospheric pressure or pressurized gas.
In a preferred embodiment, the low-voltage arm voltage division loop is formed by connecting a capacitor and a resistor in series and parallel, and the capacitor and the resistor are symmetrically welded on two sides of a PCB to form a backflow low-inductance wiring mode.
In a preferred embodiment, a high-voltage end of the low-voltage arm voltage-dividing circuit of the present invention is connected to the high-voltage arm lower electrode, and a low-voltage end of the low-voltage arm voltage-dividing circuit is connected to a ground terminal;
and the signal output terminal of the low-voltage arm voltage division loop is used for outputting a broadband high-voltage measurement result analog signal after voltage division and is connected with the signal input terminal of the digital signal processing unit.
As a preferred embodiment, the digital signal processing unit of the present invention includes an analog-to-digital conversion module, a data processing module, a data storage module, and a data transmission module;
the analog-to-digital conversion module is used for converting the received broadband high-voltage measurement result analog signal after voltage division into a digital signal;
the data processing module is used as a main control module of the digital signal processing unit and is responsible for data receiving, storage, transmission and data stream control;
the data storage module is responsible for storing the broadband high-voltage measurement result digital signal;
and the data transmission module is responsible for the signal transmission of the broadband high-voltage measurement result digital signal and the remote wireless terminal.
As a preferred embodiment, the insulating cavity of the present invention is a cylindrical cavity made of an insulating material.
As a preferred embodiment, the high voltage terminal of the present invention is directly connected to a high voltage conductor to be tested when in use;
the ground terminal is connected to the nearest ground conductor when in use.
As a preferred embodiment, the monitoring device of the present invention further includes an epoxy umbrella skirt poured on the outer layer of the insulating cavity, which increases the external insulation creepage distance for the monitoring device. According to the invention, the epoxy umbrella skirt is poured on the outer layer of the insulating cavity, so that the outer insulating property of the monitoring device is improved, and the monitoring device can work for a long time for outdoor online monitoring.
On the other hand, the invention provides an electrotechnical broadband voltage online monitoring method with an insulation gap, which is implemented based on the electrotechnical broadband voltage online monitoring device and comprises the following steps:
measuring the broadband high voltage of the measured high-voltage conductor through the high-voltage arm capacitor;
the low-voltage arm voltage division loop divides the measured broadband high voltage and outputs the divided broadband high voltage;
and processing the divided broadband high-voltage measurement result analog signal through a digital signal processing unit to obtain a broadband high-voltage measurement result digital signal.
The invention has the following advantages and beneficial effects:
the broadband voltage monitoring device provided by the invention has excellent high-frequency measurement performance. The high frequency response of the broadband voltage monitoring device is mainly limited by the inductance of the measurement loop. The high-voltage arm of the traditional resistance-capacitance voltage divider is closely related to the voltage grade, and the overall inductance of a loop is difficult to suppress to an extremely low level due to the fact that a plurality of resistance-capacitance devices are required to be connected through leads. Compared with the prior art, the high-voltage arm of the broadband voltage monitoring device provided by the invention only has one insulating gas capacitor and extremely low inductance, so that the broadband voltage monitoring device has excellent high-frequency response characteristic, and the high-frequency cut-off frequency can reach more than 10MHz generally.
The broadband voltage monitoring device provided by the invention has better safety performance. The invention has obvious open circuit in the voltage dividing loop connecting the high-voltage end of the broadband voltage monitoring device and the grounding end, so that the monitoring device only passes extremely low leakage current under the action of normal power frequency voltage, and the heat productivity of the whole device is extremely low. In addition, even if the resistance and the capacitance of the low-voltage arm are damaged, a short-circuit channel penetrating through the high-voltage end and the grounding end cannot be generated due to the existence of the insulation gap, so that the high-voltage protection circuit is suitable for outdoor online monitoring and has high safety.
The broadband voltage monitoring device provided by the invention has high stability. The monitoring device mainly comprises a voltage division loop and a digital signal processing unit which are sealed in a cavity isolated from the outside and hardly influenced by the change of the external environment, so that the stability is high.
The broadband voltage monitoring device provided by the invention realizes the digitization of local data and has strong anti-interference capability. The analog measurement result after voltage division of the monitoring device is directly converted into a digital signal in the device for storage and transmission, so that external interference caused by the fact that an analog electric signal is transmitted through a long cable in a conventional monitoring device is avoided, and the anti-interference capability is high.
The broadband voltage monitoring device provided by the invention can work outdoors for a long time, and is particularly suitable for online monitoring of broadband voltage. The internal measuring device of the monitoring device adopts a sealed design, the stability of long-term operation is good, and the epoxy umbrella skirt is poured outside the monitoring device, so that the external insulation performance meeting the external insulation safety requirement can be provided for the monitoring device, and the whole monitoring device can work outdoors for a long time and is used for online monitoring.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a monitoring device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of voltage division of a monitoring device according to an embodiment of the present invention.
Reference numbers and corresponding part names in the figures:
the high-voltage arm voltage-dividing circuit comprises a 1-high-voltage terminal, a 2-high-voltage arm upper electrode, a 3-insulating gas, a 4-high-voltage arm lower electrode, a 5-metal lead, a 6-low-voltage arm voltage-dividing circuit, a 7-signal output terminal of the low-voltage arm voltage-dividing circuit, an 8-signal input terminal of a digital signal processing unit, a 9-signal cable, a 10-digital signal processing unit, an 11-ground terminal, a 12-insulating cavity, a 13-epoxy umbrella skirt and a 14-high-voltage arm capacitor.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The above description is only intended to distinguish one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
The technology for realizing broadband voltage measurement by adopting the traditional resistance-capacitance voltage divider has the problems of inapplicability to outdoor online monitoring, potential safety hazards of short circuit, limited high-frequency response characteristic and the like; the technology of adopting the zinc oxide arrester as the voltage divider main body to realize the broadband voltage measurement has the problems of potential safety hazard of short circuit, measurement precision, reliability and the like; the non-contact high voltage measurement technology has the problems of external interference, environmental influence and the like, so that the measurement precision and reliability are caused, and the non-contact high voltage measurement technology also has the problems of high cost and the like. Based on the above, the present embodiment provides an on-line monitoring device for wideband voltage with an insulation gap, the monitoring device provided in this embodiment is based on the electrical engineering principle, and uses a gas insulation gap capacitor as a high voltage arm, a resistor-capacitor circuit as a low voltage arm to divide the high voltage, and an analog signal of the divided voltage measurement result output by the low voltage arm is input to a digital signal processing unit, and the digital signal processing unit converts the signal into a digital signal and then stores and transmits the digital signal, thereby realizing safe, reliable, and high-precision wideband high voltage digital measurement.
Specifically, as shown in fig. 1, the monitoring device provided in the embodiment of the present invention mainly includes: the high-voltage arm, the low-voltage arm voltage division loop 6 and the digital signal processing unit 10 are arranged in the insulating cavity 12 in a sealing mode.
The high-voltage arm and low-voltage arm voltage division loops are connected in series to form a voltage division structure and are connected between a high-voltage terminal 1 and a grounding terminal 11 of the monitoring device; the high-voltage arm adopts a gas insulation gap capacitor and is used for measuring high voltage; the low-voltage arm voltage-dividing loop 6 adopts a resistance-capacitance circuit to divide the high voltage on the high-voltage arm and input the divided voltage measurement result analog signal to the digital signal processing unit 10 for processing, so as to obtain a broadband voltage measurement result digital signal and store and transmit the broadband voltage measurement result digital signal.
The high-voltage arm of the traditional resistance-capacitance voltage divider is closely related to the voltage grade, and the overall inductance of a loop is difficult to suppress to an extremely low level due to the need of connecting a plurality of resistance-capacitance devices through leads. The high-voltage arm of the monitoring device provided by the embodiment of the invention only has one insulating gas capacitor, and the inductance is extremely low, so that the monitoring device provided by the embodiment of the invention has excellent high-frequency response characteristics, and the high-frequency cut-off frequency can generally reach more than 10 MHz. In addition, the voltage division loop and the digital signal processing unit of the monitoring device provided by the embodiment are sealed in the externally isolated cavity and are hardly influenced by the external environment, so that the monitoring device provided by the embodiment has high stability. Meanwhile, the voltage dividing structure of the invention has obvious open circuit, so that the monitoring device only passes through extremely low leakage current under the action of normal power frequency voltage, the heat productivity of the whole device is extremely low, and in addition, even if the resistance and the capacitance of the low-voltage arm are damaged, a short-circuit channel penetrating through the high-voltage end and the grounding end cannot be generated due to the existence of an insulating gap, therefore, the safety is high when the voltage dividing structure is used for outdoor online monitoring.
As an alternative embodiment, the high-voltage arm is a capacitor structure formed by the high-voltage arm upper electrode 2, the high-voltage arm lower electrode 4 and the insulating gas 3 therebetween. The upper electrode 2 of the high-voltage arm is made of metal materials with good conductivity, such as copper, aluminum, alloy and the like, the upper end of the upper electrode is connected with a high-voltage terminal of the monitoring device into a whole, the lower end of the upper electrode is generally a cake-shaped disc similar to a pressure ring structure, and the periphery of the disc is in a chamfered circular ring structure so as to prevent surface corona discharge under the action of high voltage. The insulating gas 3 fills the whole cavity of the insulating cavity 12, and the insulating gas 3 can be dry air, SF6 gas, CO2 gas, other insulating gases or mixed gas; the pressure of the insulating gas can be standard atmospheric pressure or pressurized gas, so that the insulating property is improved. The high-voltage arm lower electrode 4 is generally made of the same material and shape as the lower end part of the high-voltage arm upper electrode, namely the high-voltage arm lower electrode 4 is a cake-shaped disc similar to a pressure ring structure, and a chamfered circular ring structure is arranged around the disc to prevent surface corona discharge under the action of high voltage. The high-voltage arm lower electrode 4 is connected with the high-voltage end of the low-voltage arm voltage-dividing loop 6 through a metal lead 5, and the metal lead 5 is as short as possible.
In an alternative embodiment, the low-voltage arm voltage-dividing loop 6 is formed by connecting a capacitor and a resistor in series and parallel, and in order to reduce the stray inductance of the low-voltage arm voltage-dividing loop, the capacitor and the resistor are generally symmetrically welded on two sides of a PCB board, and a reflow low-inductance wiring mode is formed. The high-voltage end of the low-voltage arm voltage-dividing loop 6 is connected with the high-voltage arm lower electrode 4 through a metal lead 5, the low-voltage end of the low-voltage arm voltage-dividing loop 6 is connected with a grounding terminal 11 of the monitoring device through the metal lead 5, and the metal lead 5 is short as much as possible so as to reduce external interference; the signal output terminal 7 of the low-voltage arm voltage-dividing loop 6 is used for outputting a divided broadband high-voltage measurement result analog signal, and is connected with the signal input terminal 8 of the digital signal processing unit through a signal cable 9, and the signal cable 9 should be as short as possible to reduce external interference.
As an alternative embodiment, the digital signal processing unit 10 includes an analog-to-digital conversion module, a data processing module, a data storage module, and a data transmission module. The analog-to-digital conversion module is used for converting the received broadband high-voltage measurement result analog signal after voltage division into a digital signal; the data processing module is used as a main control module and is responsible for controlling signal recording triggering, data storage, transmission and the like of the monitoring device; the data storage module is responsible for storing the broadband voltage measurement result digital signal; the data transmission module is responsible for the transmission of the broadband voltage measurement result digital signal and the signal of the remote wireless terminal. The data processing module can adopt but not limited to a singlechip, a programmable logic device, an MCU, a DSP and the like; the data storage module can adopt a storage device; the data transmission module may employ a wireless communication device. The embodiment directly converts the analog measurement result after voltage division into a digital signal in the device for storage and transmission, thereby avoiding external interference caused by the analog electric signal transmitted by a long cable in the conventional monitoring device and improving the anti-interference capability.
As an alternative embodiment, the high-voltage terminal 1 of the monitoring device is directly connected with a high-voltage conductor to be tested when in use; the ground terminal 11 of the monitoring device is typically connected to the nearest ground conductor when in use.
As an alternative embodiment, the insulating cavity 12 is a cylindrical cavity made of an insulating material and used for accommodating a high-voltage arm, a low-voltage arm voltage-dividing circuit, a digital signal processing unit and the like of the broadband voltage online monitoring device, and the cavity is filled with an insulating gas 3. The internal measuring device of the monitoring device of the embodiment adopts a sealed design, and the stability of long-term work is good.
As an optional implementation manner, the broadband voltage online monitoring device further includes an epoxy umbrella skirt 13 poured on the outer layer of the insulating cavity 12, which increases the external insulation creepage distance of the broadband voltage online monitoring device, and improves the external insulation performance of the monitoring device, so that the monitoring device can work in outdoor online monitoring for a long time.
The working principle of the monitoring device provided by the embodiment is shown in fig. 2:
the high-voltage arm capacitor 14 is formed by the high-voltage arm upper electrode 2, the high-voltage arm lower electrode 4 and the insulating gas 3 between the high-voltage arm upper electrode and the high-voltage arm lower electrode, and the high-voltage arm capacitor 14 and the low-voltage arm voltage division loop 6 are connected in series to form a voltage division structure, so that the high voltage U is measured 1 After the low-voltage arm outputs the divided voltage U 2 。
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (11)
1. The utility model provides a take electrician's wide band voltage on-line monitoring device of insulating clearance which characterized in that includes: the high-voltage arm, the low-voltage arm voltage division loop and the digital signal processing unit are hermetically arranged in the insulating cavity;
the high-voltage arm and the low-voltage arm are connected in series to form a voltage dividing structure, and the voltage dividing structure is connected between a high-voltage terminal and a grounding terminal of the monitoring device;
the high-voltage arm adopts a capacitor formed by a gas insulation gap;
the low-voltage arm voltage division loop adopts a resistance-capacitance circuit to divide the high voltage on the high-voltage arm and input the divided broadband high-voltage measurement result analog signal to the digital signal processing unit;
and the digital signal processing unit processes the broadband high-voltage measurement result analog signal to obtain a broadband voltage measurement result digital signal.
2. The on-line monitoring device for the electrical engineering broadband voltage with the insulation gap according to claim 1, wherein the high-voltage arm is a capacitor structure formed by an upper electrode of the high-voltage arm, a lower electrode of the high-voltage arm and an insulation gas between the upper electrode and the lower electrode of the high-voltage arm;
the upper end of the upper electrode of the high-voltage arm is connected with a high-voltage terminal into a whole, and the lower end part of the upper electrode of the high-voltage arm is a disc with a chamfered edge;
the insulating gas is filled in the whole cavity in the insulating cavity;
the high-voltage arm lower electrode is connected with the low-voltage arm voltage division loop, and the upper end part of the high-voltage arm lower electrode is a disc with a chamfered edge.
3. The device for on-line monitoring of electric engineering broadband voltage with insulation gap according to claim 2, wherein the upper electrode and the lower electrode of the high-voltage arm are made of metal material.
4. The on-line monitoring device for the electrical engineering broadband voltage with the insulation gap according to claim 2, wherein the insulation gas is dry air, SF6 gas, CO2 gas or mixed gas;
the insulating gas pressure is standard atmospheric pressure or pressurized gas.
5. The device according to any of claims 1-4, wherein the low-voltage arm voltage-dividing loop is composed of a capacitor and a resistor connected in series and parallel, and the capacitor and the resistor are symmetrically soldered on both sides of the PCB to form a reflow low-inductance wiring manner.
6. The on-line monitoring device for the ergonomic broadband voltage with the insulation gap of claim 2, wherein a high voltage end of the low voltage arm voltage division loop is connected to the high voltage arm lower electrode, and a low voltage end of the low voltage arm voltage division loop is connected to a ground terminal;
and the signal output terminal of the low-voltage arm voltage division loop is used for outputting a broadband high-voltage measurement result analog signal after voltage division and is connected with the signal input terminal of the digital signal processing unit.
7. The on-line monitoring device for the electrical engineering broadband voltage with the insulation gap as claimed in any one of claims 1 to 4, wherein the digital signal processing unit comprises an analog-to-digital conversion module, a data processing module, a data storage module and a data transmission module;
the analog-to-digital conversion module is used for converting the received broadband high-voltage measurement result analog signal after voltage division into a digital signal;
the data processing module is used as a main control module of the digital signal processing unit and is responsible for data receiving, storage, transmission and data stream control;
the data storage module is responsible for storing the broadband high-voltage measurement result digital signal;
and the data transmission module is responsible for the signal transmission of the broadband high-voltage measurement result digital signal and the remote wireless terminal.
8. The on-line voltage monitoring device according to any one of claims 1-4, wherein the insulating cavity is a cylindrical cavity made of an insulating material.
9. The on-line voltage monitoring device with the insulation gap according to any one of claims 1 to 4, wherein the high voltage terminal is directly connected with a high voltage conductor to be measured when in use;
the ground terminal is connected to the nearest ground conductor when in use.
10. The on-line monitoring device for the electrotechnical broadband voltage with the insulation gap according to any one of claims 1 to 4, further comprising an epoxy umbrella skirt poured on the outer layer of the insulation cavity, wherein the epoxy umbrella skirt is used for increasing the outer insulation creepage distance of the monitoring device.
11. An on-line monitoring method for the electrical engineering broadband voltage with an insulation gap, which is implemented based on the on-line monitoring device for the electrical engineering broadband voltage according to any one of claims 1 to 10, and comprises the following steps:
measuring the broadband high voltage of the measured high-voltage conductor through the high-voltage arm capacitor;
the low-voltage arm voltage division loop divides the measured broadband high voltage and outputs the divided broadband high voltage;
and processing the divided broadband high-voltage measurement result analog signal through a digital signal processing unit to obtain a broadband high-voltage measurement result digital signal.
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