CN107741521B - Three-phase system non-contact high-voltage live judgment indicating device and method thereof - Google Patents

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

Three-phase system non-contact high-voltage live judgment indicating device and method thereof

technical field

The invention relates to a three-phase system non-contact high-voltage charged judgment indicating device and a method thereof.

Background technique

In a high-voltage system, live switching lines will cause equipment damage or even system failure, and operators who stray into high-voltage live intervals will endanger their lives. In order to ensure the safety of life and property, necessary measures should be taken to avoid the above-mentioned accidents. Effective measures include installing high-voltage live status indicating devices and live locking devices for equipment. The high-voltage electrified state indicator device is used to remind the operator that the system is electrified and should not be operated or entered into the electrified interval; the electrified locking device can forcibly lock the operating mechanism and the electrified interval when the system is electrified, so as to avoid the operator's misoperation or entering the electrified interval. interval. The prerequisite for the above two devices to work is to correctly judge the charged state of the high voltage system.

There are three main methods for judging the charged state of the high-voltage system: the first method is to install a luminous body on the high-voltage charged body, and when the system is charged, the luminous body is driven to emit light by electric field energy to indicate its charged state. This judgment method can only provide warning signals for operators, but cannot provide mandatory locking signals for locking devices. Since the warning signal is easily "ignored by humans", its safety protection effect is limited.

The second method is to convert the high voltage into a low voltage through capacitive voltage division. The low voltage can be directly used to drive the luminous body to emit light, or it can be sent as a signal to the microprocessor on the low voltage side for processing. Once the microprocessor determines When the high-voltage side is charged, it will output a forced blocking signal to block the operating mechanism and the charging interval. This method has the function of compulsory protection and stronger safety guarantee, but its disadvantage is that the high voltage is connected to the ground through a physical capacitor, which has potential safety hazards.

The third method is to install an induction probe outside the electrical safety distance of the high-voltage electrified body, and the microprocessor on the low-voltage side judges whether the high-voltage electrified body is charged according to the induction signal. Once the microprocessor determines that the high-voltage charged body is charged, it will output a forced blocking signal to block the operating mechanism and the charging interval. This method has higher safety performance because it does not directly contact with the high-voltage electrified body, so it is increasingly widely used. However, the induction signal of each sensor in the three-phase system is affected by the charged state of the three phases at the same time, and it is not feasible to judge whether a phase on the high-voltage side is charged or not based on the induction signal of a certain sensor in isolation. Therefore, it is necessary to propose a non-contact high-voltage live judgment method that can accurately judge the live state of each phase of the three-phase system, and a high-reliability non-contact high-voltage live indication device that meets the requirements of the "five preventions" of the power system.

Contents of the invention

The object of the present invention is to provide a three-phase system non-contact high-voltage electrified judging and indicating device and its method, so as to overcome the defects in the prior art.

In order to achieve the above object, the technical solution of the present invention is: a three-phase system non-contact high-voltage live judgment indicator device, including: set at the position to be detected in the three-phase system to be detected and used to sense the live signal on the high-voltage side to obtain the induction signal Sensing module for measuring induction signal strength and phase to obtain measurement data, data processing module for processing measurement data, display module for indicating high-voltage live state, control module for controlling locking mechanism and a power supply module for providing working power; the sensing module is connected to the measurement module; the measurement module, the display module and the control module are all connected to the data processing module; the sensing module, the The measurement module, the display module, the control module and the data processing module are all connected to the power module.

Further, a non-contact high-voltage live judgment method for a three-phase system is also provided. The sensing signal of the position to be detected is obtained through the sensing module, and the intensity and phase of the sensing signal are obtained through the measurement module; The relationship between the signal intensities and the phases of the sensing signals at different positions is matched with the preset relationship between the sensing signal strengths at different positions and the phases of the sensing signals at different positions. The charging condition of the phase system.

In an embodiment of the present invention, the charging situation of the three-phase system is represented by the following eight charging combination states:

1) The three phases A, B, and C are all charged;

2) Phase A and B are charged, and phase C is not charged;

3) Phase A and C are charged, and phase B is not charged;

4) Phase B and C are charged, and phase A is not charged;

5) Phase A is charged, and phases B and C are not charged;

6) Phase B is charged, and phases A and C are not charged;

7) Phase C is charged, and phases A and B are not charged;

8) The three phases A, B, and C are not charged.

In an embodiment of the present invention, the sensing signal strength includes: amplitude, effective value or average value.

In an embodiment of the present invention, the relationship between the sensing signal strengths of different positions includes: greater than, less than, equal to, or the absolute value of the difference is within a preset range.

In an embodiment of the present invention, the relationship between the phases of the different position sensing signals includes: the phase difference between the different position sensing signals is within a preset range.

In an embodiment of the present invention, the positions to be detected include at least two.

Compared with the prior art, the present invention has the following beneficial effects: a non-contact high-voltage electrification indicator device and method for a three-phase system proposed by the present invention provides a device that can accurately determine the electrification status of each phase of the three-phase system The non-contact high-voltage live device and the judgment method meet the requirements of the high-reliability non-contact high-voltage live indication in the "five preventions" of the power system.

Description of drawings

Fig. 1 is a schematic diagram of a non-contact high-voltage electrified judging and indicating device for a three-phase system in the present invention.

Fig. 2 is a schematic diagram of sensor installation in an embodiment of the present invention.

Detailed ways

The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

The present invention provides a three-phase system non-contact high-voltage live judgment indicating device, as shown in Figure 1, including: an induction module arranged at the position to be detected in the three-phase system to be detected and used to sense the live signal on the high-voltage side to obtain the induction signal , a measurement module used to measure the intensity and phase of the induction signal to obtain measurement data, a data processing module used to process the measurement data, a display module used to indicate the high-voltage live state, a control module used to control the locking mechanism, and a A power module that provides working power; the sensing module is connected to the measuring module; the measuring module, the display module and the control module are all connected to the data processing module; the sensing module, the measuring module, the display module, the control module and the data processing module are all connected to the power module.

In this embodiment, the above-mentioned functional modules may be multiple physical devices that cooperate with each other to realize the function of one functional module, or one physical device may realize multiple functional modules.

Further, it also provides a three-phase system non-contact high-voltage live judgment indication method, which obtains the sensing signal of the position to be detected through the sensing module, and obtains the sensing signal strength and sensing signal phase of the sensing signal through the measuring module; the data processing module By combining the relationship between the intensities of different position-sensing signals to be detected and the relationship between the phases of different position-sensing signals with the preset relationship between the intensities of different position-sensing signals and the relationship between the preset phases of different position-sensing signals Matching is performed to determine the electrification of the three-phase system to be detected.

In this embodiment, after the charging condition of the three-phase system to be detected is determined, the corresponding information is displayed through the display module, and the corresponding locking mechanism is controlled through the control module.

In this embodiment, the sensing signal strengths at different positions include: amplitude, effective value or average value.

In this embodiment, the relationship between different position sensing signal strengths includes: greater than, less than, equal to, or the absolute value of the difference is within a preset range.

In this embodiment, the relationship between the phases of different position sensing signals includes: the phase difference between different position sensing signals is within a preset range.

In this embodiment, the positions to be detected include at least two. The minimum number of sensor probes for the sensing module is 2.

In order to let those skilled in the art further understand the technical solution proposed by the present invention, the following description will be made in conjunction with specific embodiments.

The schematic diagram of the installation position of the inductive sensor provided in this embodiment is shown in Figure 2, wherein:

Three-phase high-voltage electrified bodies are provided, phase A is ahead of phase B and phase C is ahead, and phase B is located between phase A and phase C in terms of position.

In this embodiment, the three inductive sensors of the sensing module are respectively located near the three-phase charged body, and the distance between each phase sensor and the corresponding phase charged body is smaller than the distance between the other two-phase charged bodies. Table 1 is the preset parameters used in this embodiment for judging the relationship between the intensity of the induction signal and the range of the phase difference of the induction signal corresponding to various charging combination states of the charging state of the three-phase system. Wherein, there is an approximately equal situation in the sensed signal strength relationship determined by the absolute value of the difference between the two sensed signals, and when the absolute value of the difference is within a preset range, the relationship between the two values is defined by being approximately equal. The preset range corresponding to the absolute value of the difference is determined according to actual conditions.

Table 1

是A相传感器的感应信号强度，/>

是B相传感器的感应信号强度，/>

是C相传感器的感应信号强度；in,

is the sensing signal strength of the phase A sensor, />

is the sensing signal strength of the B-phase sensor, />

is the sensing signal strength of the C-phase sensor;

是A相感应信号与B相感应信号的相位差，/>

是B相感应信号与C相感应信号的相位差。in,

is the phase difference between the induction signal of phase A and the induction signal of phase B, />

is the phase difference between the phase B induction signal and the phase C induction signal.

Among them, when the three phases A, B, and C are not charged, the induction signal strength is zero, and the phase problem is not considered.

By matching the relationship between the collected sensing signal intensities at different positions and the phases of the sensing signals at different positions with the above-mentioned preset parameters, and comprehensively considering the strength relationship of the sensing signals and the range of the phase difference, it is possible to accurately judge the three Phase system is in what state of charge.

In this embodiment, the aforementioned preset parameters are specifically determined according to the number and installation positions of the sensors in the sensing module.

The above are the preferred embodiments of the present invention, and all changes made according to the technical solution of the present invention, when the functional effect produced does not exceed the scope of the technical solution of the present invention, all belong to the protection scope of the present invention.

Claims (6)

1. A charging judgment method of a three-phase system non-contact high-voltage live judgment indicating device, characterized in that the indicating device comprises: being arranged at a position to be detected in a three-phase system to be detected and used for inductive high-voltage side charging signal to obtain Sensing module for sensing signals, measuring module for measuring the strength and phase of sensing signals to obtain measurement data, data processing module for processing measurement data, display module for indicating high-voltage electrified status, and control locking mechanism A control module and a power supply module for providing working power; the sensing module is connected to the measurement module; the measurement module, the display module and the control module are all connected to the data processing module; the sensing module , the measurement module, the display module, the control module and the data processing module are all connected to the power module; The charging judgment method of the three-phase system non-contact high-voltage live judgment indicating device includes: obtaining the induction signal of the position to be detected in the three-phase system to be detected through the induction module, and obtaining the intensity and phase of the induction signal through the measurement module; The processing module combines the relationship between the intensities of different position-sensing signals and the relationship between the phases of different position-sensing signals with the preset relationship between the intensities of different position-sensing signals and the preset relationship between the phases of different position-sensing signals Matching is performed to determine the electrification of the three-phase system to be detected. 2. The charging judgment method of the three-phase system non-contact high-voltage charging judgment indicating device according to claim 1, wherein the charging situation of the three-phase system is represented by the following 8 kinds of charging combination states: 1) The three phases A, B, and C are all charged; 2) Phase A and B are charged, and phase C is not charged; 3) Phase A and C are charged, and phase B is not charged; 4) Phase B and C are charged, and phase A is not charged; 5) Phase A is charged, and phases B and C are not charged; 6) Phase B is charged, and phases A and C are not charged; 7) Phase C is charged, and phases A and B are not charged; 8) The three phases A, B, and C are not charged. 3. The charging judgment method of the three-phase system non-contact high-voltage charging judging and indicating device according to claim 1, wherein the induction signal strength includes: amplitude, effective value or average value. 4. According to the charging judging method of the non-contact high-voltage charging judging and indicating device of the three-phase system according to claim 1, it is characterized in that the relationship between the sensing signal strengths at different positions includes: greater than, less than, equal to or difference absolute The value is within the preset range. 5. The charging judgment method of the three-phase system non-contact high-voltage charging judging and indicating device according to claim 1, wherein the relationship between the phases of the different position sensing signals comprises: the phase between different position sensing signals The difference is within the preset range. 6. The electrification determination method of the three-phase system non-contact high-voltage electrification indication device according to claim 1, characterized in that, the positions to be detected include at least two.

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