CN113295931A - Capacitance detection system and method - Google Patents
Capacitance detection system and method Download PDFInfo
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- CN113295931A CN113295931A CN202110680907.7A CN202110680907A CN113295931A CN 113295931 A CN113295931 A CN 113295931A CN 202110680907 A CN202110680907 A CN 202110680907A CN 113295931 A CN113295931 A CN 113295931A
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Abstract
The application discloses electric capacity detecting system and method, including voltage supply unit and electric capacity detecting element, wherein: one end of the tested capacitor is connected to a phase line busbar arranged in the target workstation, and the other end of the tested capacitor is connected to a neutral point busbar arranged in the target workstation through a capacitance detection unit; one end of the voltage supply unit is connected to the phase line busbar, and the other end of the voltage supply unit is connected to the neutral point busbar; the voltage supply unit is used for applying voltage to the capacitor to be detected and transmitting a voltage signal adaptive to the applied voltage to the capacitance detection unit; the capacitance detection unit is used for receiving the voltage signal and detecting current synchronously generated at the tested capacitor after the voltage is applied to the tested capacitor; and the capacitance detection unit is also used for detecting the capacitance value of the capacitor to be detected according to the detected current and the received voltage signal. The system can improve the working efficiency.
Description
Technical Field
The present application relates to the field of capacitance detection technologies, and in particular, to a capacitance detection system and method.
Background
The capacitor bank is used as a main reactive compensation device in a station, and the capacitance detection work of the capacitor bank is required to be carried out in a new equipment handover test and a conventional preventive test. At present, a capacitance detector is used for capacitance detection, however, the frame-in-station parallel capacitor is usually formed by combining a plurality of capacitors in parallel, and is often distributed in a vertical double layer. When using the capacitance detector to measure every group electric capacity of capacitor bank, need to measure the voltage line that uses and pincerlike CT line rewiring, there is the problem that work efficiency is low. And in the process of measuring and transferring the upper-layer capacitance, the high-altitude falling risk caused by tripping over the operating personnel by the test wire also exists.
Disclosure of Invention
The embodiment of the application provides a capacitance detection system and method capable of improving working efficiency and reducing high falling risk.
In view of the above, a first aspect of the present application provides a capacitance detecting system, which includes a voltage supply unit and a capacitance detecting unit, wherein:
one end of the tested capacitor is connected to a phase line busbar arranged in a target workstation, and the other end of the tested capacitor is connected to a neutral point busbar arranged in the target workstation through the capacitor detection unit; one end of the voltage supply unit is connected to the phase line busbar, and the other end of the voltage supply unit is connected to the neutral point busbar;
the voltage supply unit is used for applying voltage to a capacitor to be detected and transmitting a voltage signal adaptive to the applied voltage to the capacitance detection unit;
the capacitance detection unit is used for receiving the voltage signal transmitted by the voltage supply unit and detecting the current synchronously generated at the tested capacitor when the voltage is applied to the tested capacitor through the voltage supply unit;
the capacitance detection unit is further used for detecting the capacitance value of the capacitor to be detected according to the detected current and the received voltage signal.
Optionally, the voltage supply unit includes a voltage applying unit, a signal generating unit and a signal transmitting unit, wherein:
the voltage applying unit is used for applying voltage to the capacitor to be detected;
the signal generating unit is used for generating a voltage signal adaptive to the applied voltage;
the signal transmitting unit is used for transmitting the voltage signal generated by the signal generating unit to the capacitance detecting unit.
Optionally, the voltage supply unit further includes a first indication unit, wherein:
the first indicating unit is used for generating an indicating signal adaptive to the voltage signal when the signal generating unit generates the corresponding voltage signal; the indication signal comprises at least one of a sound signal and a light signal, and is used for indicating that the voltage supply unit is currently in the working state of emitting the voltage signal;
the voltage supply unit is connected to a power supply for supplying the voltage supply unit with a corresponding operating current.
Optionally, the capacitance detecting unit includes a signal receiving unit, a current detecting unit and a capacitance calculating unit, wherein:
the signal receiving unit is used for receiving the voltage signal transmitted by the voltage supply unit;
the current detection unit is used for detecting the current synchronously generated at the tested capacitor;
the capacitance calculating unit is used for detecting the capacitance value C of the capacitor to be detected through the following formula:
wherein I is the detected current value, f is the output voltage frequency of the voltage supply unit, and U is the applied voltage value determined according to the received voltage signal.
Optionally, the capacitance detecting unit further includes a display screen and a data interface, wherein:
the display screen is used for displaying the detected current value, the applied voltage value determined according to the received voltage signal and/or the detected capacitance value of the capacitor to be detected in real time;
the computing terminal on the user side is connected to the capacitance computing unit through the data interface;
the data interface is used for outputting the capacitance value of the measured capacitor calculated by the capacitance calculating unit to the calculating terminal during data transmission, and performing secondary processing on the capacitance value of the measured capacitor through the calculating terminal; the secondary processing includes calculating at least one of a total capacitance of each phase and a deviation between capacitances of three phases.
Optionally, the capacitance detection unit includes a clamp meter, the clamp meter includes a clamp head and a clamp body, wherein:
the clamp head is provided with a current transformer for collecting current signals synchronously generated at the position of the capacitor to be detected;
the clamp comprises a clamp body and is characterized in that a display screen and a data interface are arranged outside the clamp body, and the signal receiving unit, the current detection unit and the capacitance calculation unit are arranged inside the clamp body.
Optionally, the outside of the forceps body is further provided with a second indicating unit and a control switch, wherein:
the second indicating unit is used for outputting a corresponding warning signal when the signal receiving unit is determined not to successfully receive the voltage signal transmitted by the signal transmitting unit;
the control switch is connected to the signal receiving unit and controls the signal receiving unit to receive the voltage signal when the control switch is turned on.
A second aspect of the present application provides a capacitance detection method applied to the capacitance detection system described in any one of the above, the method including:
applying a voltage to the capacitor to be measured through the voltage supply unit, and transmitting a voltage signal adapted to the applied voltage to the capacitance detection unit;
receiving, by the capacitance detecting unit, a voltage signal emitted by the voltage supplying unit, and detecting a current synchronously generated at the measured capacitor while applying a voltage to the measured capacitor by the voltage supplying unit;
and detecting the capacitance value of the capacitor to be detected through the capacitance detection unit according to the detected current and the received voltage signal.
Optionally, the detecting the capacitance value of the capacitor to be detected according to the detected current and the received voltage signal includes:
the method is used for detecting the capacitance value C of the capacitor to be detected through the following formula:
wherein I is the detected current value, f is the output voltage frequency of the voltage supply unit, and U is the applied voltage value determined according to the received voltage signal.
Optionally, the method further includes:
when the signal generating unit generates a corresponding voltage signal, the first indicating unit generates an indicating signal adaptive to the voltage signal, so that the voltage supply unit is indicated to be in a working state of emitting the voltage signal currently;
according to the technical scheme, the embodiment of the application has the following advantages:
in the present application, there is provided a capacitance detection system, the system including a voltage supply unit and a capacitance detection unit, wherein: one end of the tested capacitor is connected to a phase line busbar arranged in a target workstation, and the other end of the tested capacitor is connected to a neutral point busbar arranged in the target workstation through the capacitor detection unit; one end of the voltage supply unit is connected to the phase line busbar, and the other end of the voltage supply unit is connected to the neutral point busbar; the voltage supply unit is used for applying voltage to a capacitor to be detected and transmitting a voltage signal adaptive to the applied voltage to the capacitance detection unit; the capacitance detection unit is used for receiving the voltage signal transmitted by the voltage supply unit and detecting the current synchronously generated at the tested capacitor after the voltage is applied to the tested capacitor through the voltage supply unit; the capacitance detection unit is further used for detecting the capacitance value of the capacitor to be detected according to the detected current and the received voltage signal.
The capacitor detection unit with the voltage signal receiving function receives the voltage signals transmitted by the voltage supply unit in real time, and the current synchronously generated when the voltage is applied to the tested capacitor is combined, so that the capacitance value of the tested capacitor is calculated, and the risk of high-altitude falling caused by tripping an operator on a test line in a wired method is eliminated. Meanwhile, the capacitance of the capacitor to be detected is measured based on the method, so that an operator can directly find whether the capacitance detection unit is in good contact through the measured capacitance data, the situation that the host operator needs to remind the capacitor for multiple times by using the traditional method is avoided, and the working efficiency is effectively improved.
Drawings
FIG. 1 is a system block diagram of one embodiment of a capacitance sensing system of the present application;
FIG. 2 is a system diagram of a voltage supply unit in a capacitance sensing system according to the present application;
FIG. 3 is a flow chart illustrating one embodiment of a capacitance sensing method of the present application;
in the attached figure 1: 1. a voltage supply unit; 2. a capacitor to be measured; 3. a capacitance detection unit; 4. a phase line busbar; 5. a neutral point bus bar; 6. a transmitting antenna; 7. and a receiving antenna.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
Referring to fig. 1, fig. 1 is a system structure diagram of an embodiment of a capacitance detection system according to the present application, as shown in fig. 1, the system includes a voltage supply unit 1 and a capacitance detection unit 3, wherein:
one end of a tested capacitor 2 is connected to a phase line busbar 4 arranged in a target workstation, and the other end of the tested capacitor 2 is connected to a neutral point busbar 5 arranged in the target workstation through a capacitance detection unit 3; one end of the voltage supply unit 1 is connected to the phase busbar 4, and the other end of the voltage supply unit 1 is connected to the neutral busbar 5.
The functions of the voltage supply unit 1 and the capacitance detection unit 3 are specifically:
the voltage supply unit 1 is used for applying a voltage to the capacitor 2 to be measured and transmitting a voltage signal adapted to the applied voltage to the capacitance detection unit.
Specifically, voltage supply unit 1 in this application can further understand the portable power source who possesses wireless transmission function, and, this portable power source's outside is provided with many with transmitting antenna 6, in this application, will further transmit corresponding voltage signal to electric capacity detecting element with transmitting antenna 6 based on setting more.
In one embodiment, on the one hand, the portable mobile power supply adopts a rechargeable storage battery and is externally connected with a power supply: alternating current 220V +/-10% and 50 Hz; output voltage (open circuit): 20V plus or minus 10 percent and 50 Hz; maximum output current: 20A; output short-circuit protection: and (4) automatic. On the other hand, the portable power supply employed in the present application has a function of transmitting a voltage signal, and is provided with a transmission switch, it should be noted that, when the transmission switch is pressed by a user, at which time the transmission antenna 6 is communicated with the voltage supply unit, the voltage signal will be transmitted to the capacitance detection unit based on the transmission antenna 6 as illustrated in fig. 1.
In the embodiment, the voltage signal is transmitted by adopting a wireless transmission technology, so that the risk of high-altitude falling caused by tripping over of an operator by a test wire in a wired method is eliminated, and the detection efficiency is improved.
And the capacitance detection unit 3 is used for receiving the voltage signal emitted by the voltage supply unit 1 and detecting the current synchronously generated at the tested capacitor 2 when the voltage is applied to the tested capacitor 2 through the voltage supply unit 1.
Specifically, the capacitance detection unit further comprises a display screen and a data interface, wherein: the display screen is used for displaying the detected current value, the applied voltage value determined according to the received voltage signal and/or the detected capacitance value of the capacitor to be detected in real time; the computing terminal on the user side is connected to the capacitance computing unit through a data interface; the data interface is used for outputting the capacitance value of the measured capacitor calculated by the capacitance calculating unit to the calculating terminal during data transmission, and performing secondary processing on the capacitance value of the measured capacitor by the calculating terminal; the secondary processing includes calculating at least one of a total capacitance of each phase and a deviation between capacitances of three phases.
In one embodiment, the capacitance detecting unit 3 includes a clamp meter, the clamp meter includes a clamp head and a clamp body, wherein: the clamp head is provided with a current transformer for collecting current signals synchronously generated at the tested capacitor 2; the outside of the clamp body can be provided with a display screen and a data interface, and in the embodiment, the electric quantity, the measured current value and the like of the clamp meter are displayed in real time through the display screen; in addition, the system can also be connected and communicated with an external computing terminal through a preset data interface. It should be noted that, the circuit for acquiring current data and receiving wireless signals in the present application is further fixed or detachably disposed inside the forceps body.
In the embodiment, the necessary information is displayed in real time based on the display screen, so that a user can conveniently master the detection progress in time, potential risks existing in the detection process can be found in time, the problems of floating, abnormity and the like of detection data are solved, and the accuracy of measurement is improved.
The capacitance detection unit 3 is further configured to detect a capacitance value of the capacitor to be detected according to the detected current and the received voltage signal.
Specifically, the capacitance detection unit includes a signal receiving unit, a current detection unit and a capacitance calculation unit, wherein: a signal receiving unit for receiving the voltage signal transmitted via the voltage supply unit; the current detection unit is used for detecting the current synchronously generated at the tested capacitor; the capacitance calculating unit is used for detecting the capacitance value C of the capacitor to be detected through the following formula:
where I is the detected current value, f is the output voltage frequency of the voltage supply unit, and U is the applied voltage value determined according to the received voltage signal.
In one embodiment, the capacitance detection unit may be a capacitance clamp meter with a wireless receiving function, and as shown in fig. 1, a plurality of receiving antennas 7 are fixedly or detachably disposed outside the capacitance clamp meter in this application, in this embodiment, a voltage signal transmitted through the voltage supply unit is received in real time through the receiving antennas 7 disposed in advance. In addition, the capacitance detection unit may also further calculate the capacitance value of the measured capacitor 2 according to the received voltage signal in combination with the detected current signal, thereby completing the measurement of the capacitance of the measured capacitor 2. It should be noted that, reference may be made to the manner in which the capacitance clamp meter 3 is fixed between the capacitor 2 to be tested and the neutral point busbar 5:
firstly, an opening of the capacitance clamp meter 3 clamps a lead in the capacitor 2 to be tested, when the capacitance clamp meter 3 needs to be fixed, the opening is closed, and similarly, a lead passes through the middle of the circle center, and reference can be made to fig. 1 specifically.
In the embodiment, the capacitance detector based on the wireless communication technology is used for testing the capacitance, and testers can directly find whether the clamp meter is in good contact or not by measuring capacitance data, so that the process that a host operator needs to remind for many times in the traditional method is avoided, and the working efficiency is improved. In addition, the weight of the testing equipment can be effectively reduced by adopting wireless instead of wired, and the man-machine effect is improved.
When the capacitance detection system is implemented to detect capacitance, the following steps are specifically referred to:
(1) the voltage supply unit 1 is turned on, and voltage signals are injected from both ends of the capacitor under test 2, and at the same time, voltage signals adapted to the currently applied voltage are transmitted to the capacitance detection unit 3.
(2) The capacitance detection unit 3 is used for detecting the current currently flowing through the measured capacitor 2 and receiving the voltage signal transmitted by the voltage supply unit 1.
(3) Detecting the capacitance value of the capacitor to be detected according to the current detected in the step (2) and the received voltage signal by using the following formula:
(4) when the capacitance values of other capacitors to be detected in the field are detected subsequently, the capacitance detection unit is only required to be switched to one end of the capacitor to be detected, which is connected with the neutral point bus bar, so that the capacitance detection of each capacitor to be detected can be conveniently, accurately and quickly completed.
The capacitance detection system disclosed in the application receives the voltage signal transmitted by the voltage supply unit in real time through the capacitance detection unit with the voltage signal receiving function, and calculates the capacitance value of the measured capacitor by combining the current synchronously generated when the measured capacitor is applied with voltage, thereby eliminating the risk of high-altitude falling caused by tripping an operator by a test wire in a wired method. Meanwhile, the capacitance of the capacitor to be detected is measured based on the method, so that an operator can directly find whether the capacitance detection unit is in good contact through the measured capacitance data, the situation that the host operator needs to remind the capacitor for multiple times by using the traditional method is avoided, and the working efficiency is effectively improved.
For easy understanding, please refer to fig. 2, fig. 2 is a system structure diagram of a voltage supply unit in a capacitance detection system according to the present application, and as shown in fig. 2, the voltage supply unit 1 includes a voltage discharge unit 101, a signal generation unit 102 and a signal emission unit 103, wherein:
the voltage application unit 101 is for applying a voltage to a capacitor to be measured.
In the process of applying voltage, voltage is actually applied to two ends of the capacitor 2 to be measured, so that current flows through the capacitor 2 to be measured.
The signal generation unit 102 is configured to generate a voltage signal in accordance with the applied voltage.
The generated voltage signal is further input to the signal transmitting unit 103, and the signal transmitting unit 103 receives and retransmits the voltage signal.
The signal transmitting unit 103 is configured to transmit the voltage signal generated by the signal generating unit to the capacitance detecting unit 3.
In one embodiment, the signal transmitting unit 103 dynamically adjusts the operating mode through a transmitting switch preset outside the voltage supply unit; that is, the transmission switch is pressed by the user, and when the operation circuit between the signal transmission unit 103 and the transmission antenna 6 is turned on, the transmission of the voltage signal is performed by the transmission antenna 6 illustrated in fig. 1.
In one embodiment, the voltage supply unit further includes a first indication unit, wherein:
and the first indicating unit is used for generating an indicating signal adaptive to the voltage signal when the signal generating unit generates the corresponding voltage signal. The indication signal comprises at least one of a sound signal and a light signal, and the indication signal is used for indicating that the voltage supply unit is currently in the working state of transmitting the voltage signal.
It should be noted that when the signal transmitting unit is controlled in its operation mode by the transmitting switch provided outside the voltage supply unit as disclosed in the above embodiments, the first indicating unit will be further triggered to generate the sound signal and/or the light signal when the transmitting switch is pressed by the user and the operation circuit between the transmitting switch and the first indicating unit is turned on. Illustratively, the generated sound signal and/or light signal is transmitted to one or more external or internal indicating lamps and/or loudspeakers through the first indicating unit, and when the working circuit provided with the indicating lamps and/or loudspeakers receives the corresponding indicating signal, the working circuit further triggers the indicating lamps to light or triggers the loudspeakers to make sound, so as to achieve the effect of prompting.
The voltage supply unit is connected to a power supply source, and the power supply source is used for supplying corresponding working current to the voltage supply unit.
The voltage supply unit can be a storage battery with a wireless signal transmitting function, and is externally connected with a power supply, so that the voltage supply unit can continuously apply voltage to the capacitor to be detected. It should be noted that the external power source is an adapter for directly using ac power to supply power to the device. The external power supply is divided into a standard type and a long-acting type. Generally, a standard type internal battery pack is provided, and power supply can be maintained for a short time (generally about 10 minutes) after power failure; the long-acting type machine is not provided with batteries, but is additionally provided with a charger, and a user can be matched with a plurality of groups of batteries according to the self requirement to prolong the power supply time.
In one embodiment, the capacitance detection unit comprises a clamp meter, the clamp meter comprises a clamp head and a clamp body, wherein:
the binding clip is provided with a current transformer for collecting current signals synchronously generated at the position of the capacitor to be detected.
The current transformer is an instrument for measuring by converting a large primary side current into a small secondary side current according to the electromagnetic induction principle. It should be noted that the current transformer is composed of a closed iron core and a winding. Its primary winding has few turns and is typically wired in the line of the current to be measured. The iron core of the current transformer can be opened when the wrench is tightened; the lead through which the current to be measured passes can pass through the open notch of the core without being cut off, and the core is closed after the wrench is released. The current conductor of the circuit under test, which passes through the core, becomes the primary coil of the current transformer, wherein a current is induced in the secondary coil by the current.
The outside of pincers body is equipped with display screen and data interface, and the inside of pincers body is equipped with signal reception unit, current detection unit and electric capacity computational element.
Specifically, the outside of pincers body still is equipped with second indicating unit and control switch, wherein: the second indicating unit is used for outputting a corresponding warning signal when the signal receiving unit is determined not to successfully receive the voltage signal transmitted by the signal transmitting unit; the control switch is connected to the signal receiving unit, and when the control switch is turned on, the control signal receiving unit receives the voltage signal.
In one embodiment, the second indicating unit may be connected to a display screen or a handheld terminal of a user, and when it is determined that the signal receiving unit fails to receive the voltage signal, corresponding warning information is fed back to the display screen, for example: when a detection fault exists at present, warning information is prompted through a display screen; or sending a corresponding short message to a handheld terminal of the user to prompt the user that the detection fault exists currently.
The foregoing are embodiments of the system of the present application, and the present application further provides a capacitance detecting method applied to the capacitance detecting system of any of the above embodiments, as shown in fig. 3, including the following steps:
step S300, applying voltage to the tested capacitor through the voltage supply unit, and transmitting a voltage signal adaptive to the applied voltage to the capacitance detection unit;
step S301, receiving, by the capacitance detecting unit, the voltage signal emitted by the voltage supplying unit, and detecting a current synchronously generated at the measured capacitor after applying the voltage to the measured capacitor by the voltage supplying unit.
Step S302, the capacitance detecting unit detects the capacitance of the capacitor to be detected according to the detected current and the received voltage signal.
In one embodiment, the detecting the capacitance value of the capacitor to be detected according to the detected current and the received voltage signal includes: the method is used for detecting the capacitance value C of the capacitor to be detected through the following formula:
where I is the detected current value, f is the output voltage frequency of the voltage supply unit, and U is the applied voltage value determined according to the received voltage signal.
In one embodiment, the method further comprises: when the signal generating unit generates a corresponding voltage signal, the first indicating unit generates an indicating signal adaptive to the voltage signal so as to indicate that the voltage supply unit is currently in a working state of transmitting the voltage signal; and when the signal receiving unit is determined to be incapable of successfully receiving the voltage signal transmitted by the signal transmitting unit, outputting a corresponding warning signal through the second indicating unit.
In one embodiment, the method further comprises: applying voltage to the capacitor to be tested through a voltage applying unit; generating a voltage signal adapted to the applied voltage by a signal generating unit; the voltage signal generated by the signal generating unit is transmitted to the capacitance detecting unit by the signal transmitting unit.
In one embodiment, the method further comprises: generating an indication signal adapted to the voltage signal by the first indication unit when the signal generation unit generates the corresponding voltage signal; the indication signal comprises at least one of a sound signal and a light signal, and the indication signal is used for indicating that the voltage supply unit is currently in the working state of transmitting the voltage signal.
In one embodiment, the method further comprises: displaying the detected current value, the applied voltage value determined according to the received voltage signal and/or the detected capacitance value of the capacitor to be detected in real time through a display screen; the computing terminal on the user side is connected to the capacitance computing unit through a data interface; when data transmission is carried out, the capacitance value of the measured capacitor calculated by the capacitance calculating unit is output to the calculating terminal through the data interface, and secondary processing is carried out on the capacitance value of the measured capacitor through the calculating terminal; the secondary processing includes calculating at least one of a total capacitance of each phase and a deviation between capacitances of three phases.
According to the capacitance detection method, the voltage signal transmitted by the voltage supply unit is received in real time through the capacitance detection unit with the voltage signal receiving function, the current synchronously generated when the voltage is applied to the capacitor to be detected is combined, the capacitance value of the capacitor to be detected is calculated, and the risk that the operator trips on a test wire to cause high-altitude falling in a wired method is eliminated. Meanwhile, the capacitance of the capacitor to be detected is measured based on the method, so that an operator can directly find whether the capacitance detection unit is in good contact through the measured capacitance data, the situation that the host operator needs to remind the capacitor for multiple times by using the traditional method is avoided, and the working efficiency is effectively improved.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely indicative, e.g., that the division of the units is merely a logical division, and that in actual implementation there may be additional divisions, e.g., that multiple units or components may be combined or integrated into another system, or that some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A capacitance detection system, comprising a voltage supply unit and a capacitance detection unit, wherein:
one end of the tested capacitor is connected to a phase line busbar arranged in a target workstation, and the other end of the tested capacitor is connected to a neutral point busbar arranged in the target workstation through the capacitor detection unit; one end of the voltage supply unit is connected to the phase line busbar, and the other end of the voltage supply unit is connected to the neutral point busbar;
the voltage supply unit is used for applying voltage to a capacitor to be detected and transmitting a voltage signal adaptive to the applied voltage to the capacitance detection unit;
the capacitance detection unit is used for receiving the voltage signal transmitted by the voltage supply unit and detecting the current synchronously generated at the tested capacitor when the voltage is applied to the tested capacitor through the voltage supply unit;
the capacitance detection unit is further used for detecting the capacitance value of the capacitor to be detected according to the detected current and the received voltage signal.
2. The system according to claim 1, wherein the voltage supply unit includes a voltage application unit, a signal generation unit, and a signal transmission unit, wherein:
the voltage applying unit is used for applying voltage to the capacitor to be detected;
the signal generating unit is used for generating a voltage signal adaptive to the applied voltage;
the signal transmitting unit is used for transmitting the voltage signal generated by the signal generating unit to the capacitance detecting unit.
3. The system of claim 2, wherein the voltage supply unit further comprises a first indication unit, wherein:
the first indicating unit is used for generating an indicating signal adaptive to the voltage signal when the signal generating unit generates the corresponding voltage signal; the indication signal comprises at least one of a sound signal and a light signal, and is used for indicating that the voltage supply unit is currently in the working state of emitting the voltage signal;
the voltage supply unit is connected to a power supply for supplying the voltage supply unit with a corresponding operating current.
4. The system of claim 3, wherein the capacitance detection unit comprises a signal receiving unit, a current detection unit, and a capacitance calculation unit, wherein:
the signal receiving unit is used for receiving the voltage signal transmitted by the voltage supply unit;
the current detection unit is used for detecting the current synchronously generated at the tested capacitor;
the capacitance calculating unit is used for detecting the capacitance value C of the capacitor to be detected through the following formula:
wherein I is the detected current value, f is the output voltage frequency of the voltage supply unit, and U is the applied voltage value determined according to the received voltage signal.
5. The system of claim 4, wherein the capacitance detection unit further comprises a display screen and a data interface, wherein:
the display screen is used for displaying the detected current value, the applied voltage value determined according to the received voltage signal and/or the detected capacitance value of the capacitor to be detected in real time;
the computing terminal on the user side is connected to the capacitance computing unit through the data interface; the data interface is used for outputting the capacitance value of the measured capacitor calculated by the capacitance calculating unit to the calculating terminal during data transmission, and performing secondary processing on the capacitance value of the measured capacitor through the calculating terminal; the secondary processing includes calculating at least one of a total capacitance of each phase and a deviation between capacitances of three phases.
6. The system of claim 5, wherein the capacitance detection unit comprises a clamp meter comprising a clamp head and a clamp body, wherein:
the clamp head is provided with a current transformer for collecting current signals synchronously generated at the position of the capacitor to be detected;
the clamp comprises a clamp body and is characterized in that a display screen and a data interface are arranged outside the clamp body, and the signal receiving unit, the current detection unit and the capacitance calculation unit are arranged inside the clamp body.
7. The system according to claim 6, characterized in that the exterior of the caliper body is further provided with a second indicating unit and a control switch, wherein:
the second indicating unit is used for outputting a corresponding warning signal when the signal receiving unit is determined not to successfully receive the voltage signal transmitted by the signal transmitting unit;
the control switch is connected to the signal receiving unit and controls the signal receiving unit to receive the voltage signal when the control switch is turned on.
8. A capacitance measuring method applied to the capacitance measuring system according to any one of claims 1 to 7, the method comprising:
applying a voltage to the capacitor to be measured through the voltage supply unit, and transmitting a voltage signal adapted to the applied voltage to the capacitance detection unit;
receiving, by the capacitance detecting unit, a voltage signal emitted by the voltage supplying unit, and detecting a current synchronously generated at the measured capacitor while applying a voltage to the measured capacitor by the voltage supplying unit;
and detecting the capacitance value of the capacitor to be detected through the capacitance detection unit according to the detected current and the received voltage signal.
9. The method of claim 8, wherein the detecting the capacitance value of the capacitor under test according to the detected current and the received voltage signal comprises:
the method is used for detecting the capacitance value C of the capacitor to be detected through the following formula:
wherein I is the detected current value, f is the output voltage frequency of the voltage supply unit, and U is the applied voltage value determined according to the received voltage signal.
10. The method of claim 8, further comprising:
when the signal generating unit generates a corresponding voltage signal, the first indicating unit generates an indicating signal adaptive to the voltage signal, so that the voltage supply unit is indicated to be in a working state of emitting the voltage signal currently;
and when the signal receiving unit is determined not to successfully receive the voltage signal transmitted by the signal transmitting unit, outputting a corresponding warning signal through the second indicating unit.
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| CN113809757A (en) * | 2021-09-17 | 2021-12-17 | 广东电网有限责任公司 | Automatic balance adjusting device and method for double-star frame type parallel capacitor bank |
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