CN107741521B - Three-phase system non-contact high-voltage electrification judging and indicating device and method thereof - Google Patents
Three-phase system non-contact high-voltage electrification judging and indicating device and method thereof Download PDFInfo
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- CN107741521B CN107741521B CN201711240642.9A CN201711240642A CN107741521B CN 107741521 B CN107741521 B CN 107741521B CN 201711240642 A CN201711240642 A CN 201711240642A CN 107741521 B CN107741521 B CN 107741521B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/145—Indicating the presence of current or voltage
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Abstract
The invention relates to a non-contact high-voltage electrification judging and indicating device of a three-phase system and a method thereof, wherein the non-contact high-voltage electrification judging and indicating device comprises the following steps: the device comprises an induction module, a measurement module, a data processing module display module, a control module and a power supply module; the sensing module is connected with the measuring module; the measuring module, the display module and the control module are all connected with the data processing module; the sensing module, the measuring module, the display module, the control module and the data processing module are all connected with the power supply module. The method comprises the steps of obtaining an induction signal of a position to be detected through an induction module, and obtaining the intensity and the phase of the induction signal through a measurement module; and matching the relation between the induction signal intensities at different positions and the relation between the induction signal phases at different positions with the preset relation between the induction signal intensities at different positions and the preset relation between the induction signal phases at different positions through a data processing module, and determining the electrification condition of the three-phase system to be detected.
Description
Technical Field
The invention relates to a non-contact high-voltage electrification judging and indicating device and a method thereof for a three-phase system.
Background
In high voltage systems, live switching lines can lead to equipment damage and even system failure, and operator misentering a high voltage live interval can be more life threatening. In order to ensure the life and property safety, necessary measures should be taken to avoid the occurrence of the accidents, and effective measures include installation of a high-voltage electrified state indicating device and an electrified locking device for equipment. The high-voltage charging state indicating device is used for reminding an operator that the system is in a charging state and is not in a charging operation or enters a charging interval; the electrified locking device can forcedly lock the operating mechanism and the electrified interval when the system is electrified, so that misoperation or misoperation of operators into the electrified interval is avoided. The premise of the operation of the two devices is to correctly judge the electrified state of the high-voltage system.
The method for judging the electrified state of the high-voltage system mainly comprises three methods: the first method is to mount a light emitting body on a high-voltage charged body, and when the system is charged, the light emitting body is driven to emit light by electric field energy to indicate the charged state. This determination method can only provide an alarm signal for an operator and cannot provide a forced locking signal for the locking device. Because the warning signal is easy to be ignored by human beings, the safety guarantee effect is limited.
The second method is to convert the high voltage into low voltage through capacitive voltage division, the low voltage can be directly used for driving the illuminant to emit light, or can be used as a signal to be sent to a microprocessor on the low voltage side for processing, and once the microprocessor judges that the high voltage side is electrified, a forced locking signal is output to lock the operating mechanism and the electrified interval. The method has the forced protection function and stronger safety guarantee function, but has the defect that the high voltage is connected with the ground through the solid capacitor, so that potential safety hazards exist.
The third method is to install an induction probe outside the electrical safety distance of the high-voltage electrified body, and the microprocessor at the low voltage side judges whether the high-voltage electrified body is electrified or not according to the induction signal. When the microprocessor determines that the high voltage charged body is charged, a forced locking signal is output to lock the operating mechanism and the charging interval. The method has higher safety performance because of not being in direct contact with a high-voltage charged body, so that the method is increasingly widely applied. However, the sensing signal of each sensor in the three-phase system is simultaneously affected by the three-phase charging state, and it is not feasible to determine whether a certain phase on the high-voltage side is charged or not based on the sensing signal of a certain sensor in isolation. Therefore, it is necessary to provide a non-contact type high-voltage electrification judging method capable of accurately judging the electrification state of each phase of a three-phase system, and a high-reliability non-contact type high-voltage electrification indicating device meeting the requirement of five-prevention of a power system.
Disclosure of Invention
The invention aims to provide a non-contact high-voltage electrification judging and indicating device and a method thereof for a three-phase system, which are used for overcoming the defects in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a non-contact high-voltage electrification judging and indicating device of a three-phase system comprises: the system comprises an induction module, a measurement module, a data processing module, a display module, a control module and a power module, wherein the induction module is arranged at a to-be-detected position of a three-phase system to be detected and used for inducing a high-voltage side electrified signal to obtain an induction signal, the measurement module is used for measuring the intensity and the phase of the induction signal to obtain measurement data, the data processing module is used for processing the measurement data, the display module is used for indicating a high-voltage electrified state, the control module is used for controlling a locking mechanism, and the power module is used for providing a working power supply; the sensing module is connected with the measuring module; the measuring module, the display module and the control module are all connected with the data processing module; the sensing module, the measuring module, the display module, the control module and the data processing module are all connected with the power supply module.
Further, a non-contact high-voltage electrification judging method of the three-phase system is provided, an induction signal of a position to be detected is obtained through an induction module, and the intensity and the phase of the induction signal are obtained through a measurement module; the data processing module is used for determining the electrification condition of the three-phase system to be detected by matching the relation between the induction signal intensities at different positions and the relation between the induction signal phases at different positions with the preset relation between the induction signal intensities at different positions and the preset relation between the induction signal phases at different positions.
In one embodiment of the present invention, the charging condition of the three-phase system is represented by the following 8 charging combination states:
1) A, B, C three phases are all electrified;
2) A, B two phases are charged and the C phase is uncharged;
3) A, C two phases are charged and phase B is not charged;
4) B, C two phases are charged and phase a is not charged;
5) Phase a is charged and phase B, C is uncharged;
6) Phase B is charged and phase A, C is uncharged;
7) Phase C is charged, and phase A, B is uncharged;
8) A, B, C three phases are not charged.
In one embodiment of the present invention, the sensing signal strength includes: amplitude, effective value, or average value.
In one embodiment of the present invention, the relationship between the different position sensing signal intensities includes: the absolute value of the difference is greater than, less than, equal to or within a preset range.
In one embodiment of the present invention, the relationship between the phases of the different position sensing signals includes: the phase difference between the sensing signals at different positions is within a preset range.
In an embodiment of the present invention, the positions to be detected include at least two positions.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a non-contact type high-voltage electrification judging and indicating device and a non-contact type high-voltage electrification judging and indicating method for a three-phase system, which can accurately judge the electrification state of each phase of the three-phase system, and meet the requirement of high-reliability non-contact type high-voltage electrification indication in five-prevention of a power system.
Drawings
Fig. 1 is a schematic diagram of a three-phase system non-contact high-voltage electrification judgment indication device in the invention.
FIG. 2 is a schematic diagram of a sensor installation in accordance with an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is specifically described below with reference to the accompanying drawings.
The invention provides a non-contact high-voltage electrification judging and indicating device of a three-phase system, as shown in figure 1, comprising: the system comprises an induction module, a measurement module, a data processing module, a display module, a control module and a power module, wherein the induction module is arranged at a to-be-detected position of a three-phase system to be detected and used for inducing a high-voltage side electrified signal to obtain an induction signal, the measurement module is used for measuring the intensity and the phase of the induction signal to obtain measurement data, the data processing module is used for processing the measurement data, the display module is used for indicating a high-voltage electrified state, the control module is used for controlling a locking mechanism, and the power module is used for providing a working power supply; the sensing module is connected with the measuring module; the measuring module, the display module and the control module are all connected with the data processing module; the sensing module, the measuring module, the display module, the control module and the data processing module are all connected with the power supply module.
In this embodiment, the above functional module may be a plurality of physical devices that cooperate with each other to implement the function of one functional module, or may be a plurality of functional modules implemented by one physical device.
Further, a non-contact high-voltage electrification judging and indicating method of the three-phase system is provided, an induction signal of a position to be detected is obtained through an induction module, and the induction signal intensity and the induction signal phase of the induction signal are obtained through a measurement module; the data processing module is used for determining the electrification condition of the three-phase system to be detected by matching the relation between the induction signal intensities of different positions to be detected and the relation between the induction signal phases of different positions with the preset relation between the induction signal intensities of different positions and the preset relation between the induction signal phases of different positions.
In this embodiment, after determining the electrification condition of the three-phase system to be detected, the display module displays corresponding information, and the control module controls the corresponding locking mechanism.
In this embodiment, the sensing signal intensities at different positions include: amplitude, effective value, or average value.
In this embodiment, the relationship between the sensed signal intensities at different positions includes: the absolute value of the difference is greater than, less than, equal to or within a preset range.
In this embodiment, the relationship between the phases of the different position sensing signals includes: the phase difference between the sensing signals at different positions is within a preset range.
In this embodiment, the positions to be detected include at least two positions. The number of sensor probes of the sensing module is at least 2.
In order to enable those skilled in the art to further understand the technical solutions proposed by the present invention, the following description is made with reference to specific embodiments.
The schematic diagram of the installation position of the induction sensor provided in this embodiment is shown in fig. 2, in which:
a three-phase high-voltage charged body is provided, wherein A phase leads B phase and leads C phase in phase, and B phase is positioned between A phase and C phase in position.
In this embodiment, three induction sensors of the induction module are respectively located near the three-phase charged bodies, and the distance between each phase sensor and the corresponding phase charged body is smaller than the distance between each phase sensor and the other two phase charged bodies. Table 1 is a preset parameter of the range to which the induced signal intensity relationship and the induced signal phase difference corresponding to the various charged combination states for determining the charged state of the three-phase system provided in the present embodiment belong. Wherein the presence of an approximately equal relationship between the sensed signal strengths is determined by the absolute value of the difference between the two sensed signals, and when the absolute value of the difference is within a predetermined range, the two values are defined by an approximately equal relationship therebetween. The preset range corresponding to the absolute value of the difference is determined according to specific practical conditions.
TABLE 1
Wherein, the liquid crystal display device comprises a liquid crystal display device,
is the sensed signal strength of the A-phase sensor, < >>
Is the sensed signal strength of the B-phase sensor, < >>
Is the sensing signal intensity of the C-phase sensor;
wherein, the liquid crystal display device comprises a liquid crystal display device,
is the phase difference between the A phase sensing signal and the B phase sensing signal,>
is the phase difference between the B phase sensing signal and the C phase sensing signal.
When none of the A, B, C three phases is electrified, the strength of the induction signal is zero, and the phase problem is not considered.
By matching the acquired relation between the intensities of the induction signals at different positions and the relation between the phases of the induction signals at different positions with the preset parameters, the intensity relation and the range of the phase difference of the induction signals are comprehensively considered, and the three-phase system can be accurately judged in what kind of electrified state.
In this embodiment, the preset parameters are specifically determined according to the number of sensors in the sensing module and the installation position.
The above is a preferred embodiment of the present invention, and all changes made according to the technical solution of the present invention belong to the protection scope of the present invention when the generated functional effects do not exceed the scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides a live judgment method of three-phase system non-contact high voltage live judgment indicating device which characterized in that, indicating device includes: the system comprises an induction module, a measurement module, a data processing module, a display module, a control module and a power module, wherein the induction module is arranged at a to-be-detected position of a three-phase system to be detected and used for inducing a high-voltage side electrified signal to obtain an induction signal, the measurement module is used for measuring the intensity and the phase of the induction signal to obtain measurement data, the data processing module is used for processing the measurement data, the display module is used for indicating a high-voltage electrified state, the control module is used for controlling a locking mechanism, and the power module is used for providing a working power supply; the sensing module is connected with the measuring module; the measuring module, the display module and the control module are all connected with the data processing module; the sensing module, the measuring module, the display module, the control module and the data processing module are all connected with the power supply module;
the electrification judging method of the non-contact type high-voltage electrification judging and indicating device of the three-phase system comprises the following steps: the method comprises the steps of obtaining an induction signal of a to-be-detected position of a three-phase system to be detected through an induction module, and obtaining the intensity and the phase of the induction signal through a measurement module; the data processing module is used for determining the electrification condition of the three-phase system to be detected by matching the relation between the induction signal intensities at different positions and the relation between the induction signal phases at different positions with the preset relation between the induction signal intensities at different positions and the preset relation between the induction signal phases at different positions.
2. The method for determining the electrification of a non-contact high-voltage electrification determining and indicating device for a three-phase system according to claim 1, wherein the electrification condition of the three-phase system is represented by the following 8 electrification combination states:
1) A, B, C three phases are all electrified;
2) A, B two phases are charged and the C phase is uncharged;
3) A, C two phases are charged and phase B is not charged;
4) B, C two phases are charged and phase a is not charged;
5) Phase a is charged and phase B, C is uncharged;
6) Phase B is charged and phase A, C is uncharged;
7) Phase C is charged, and phase A, B is uncharged;
8) A, B, C three phases are not charged.
3. The method for determining the electrification of a three-phase system non-contact high-voltage electrification determination indicating device according to claim 1, wherein the induction signal intensity includes: amplitude, effective value, or average value.
4. The method for determining the electrification of a non-contact type high-voltage electrification determining and indicating device for a three-phase system according to claim 1, wherein the relationship between the different position-sensing signal intensities includes: the absolute value of the difference is greater than, less than, equal to or within a preset range.
5. The method for determining the electrification of a three-phase system non-contact high-voltage electrification determination indicating device according to claim 1, wherein the relationship between the phases of the different position-sensing signals includes: the phase difference between the sensing signals at different positions is within a preset range.
6. The method for determining the electrification of a three-phase system non-contact type high-voltage electrification determining and indicating device according to claim 1, wherein the positions to be detected include at least two.
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| CN110726966B (en) * | 2019-12-03 | 2022-05-31 | 积成电子股份有限公司 | Device and method for monitoring whether non-contact electric energy meter has electricity or not |
| CN111025006B (en) * | 2019-12-20 | 2021-04-16 | 云南电网有限责任公司玉溪供电局 | Non-contact voltage detection and phase recognition device |
| CN112787650B (en) * | 2020-12-30 | 2022-09-13 | 国网河北省电力有限公司 | Method and device for rapidly judging three-phase position of isolating switch |
| CN114280354B (en) * | 2021-12-21 | 2023-11-14 | 镇江市百汇电器有限公司 | Non-contact high-voltage live detection circuit of three-phase system |
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