CN103344818B - Non-contact type electricity checking device and electricity-testing method - Google Patents

Abstract

The invention discloses a non-contact electroscope and an electroscope method, belonging to the field of electric equipment. The electroscope includes: an induction module for detecting the electric field strength of the object to be measured; a distance measuring module for detecting the distance from the electroscope to the object to be measured; a processing module for detecting the distance from the electroscope to the object to be measured The distance of the object to be measured and the measured electric field strength are used to determine whether the object to be measured is charged. The invention detects the electric field strength of the object to be measured and the distance from the electroscope to the object to be measured, and judges whether the object to be measured is charged according to the corresponding relationship between the distance and the electric field strength, thereby avoiding the low detection accuracy caused by the influence of the surrounding environment , improve the detection accuracy and eliminate potential safety hazards.

Description

Non-contact electroscope and electroscope method

technical field

The invention relates to the field of electric equipment, in particular to a non-contact electroscope and an electroscope method.

Background technique

An electroscope is an instrument used to test whether an object is charged. According to the electroscope mode, the electroscope can be divided into a contact electroscope and a non-contact electroscope.

Among them, the non-contact electroscope is a new type of electroscope, which is not directly in contact with the object to be measured, and is widely used in the electrometry of dangerous objects such as high-voltage lines. There is a non-contact electroscope, which is composed of an electric field sensor, a processing circuit and a signal indication. power or no power information.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

Since the objects around the object to be measured will also generate an electric field (such as high-voltage lines are usually erected together, when measuring whether one high-voltage line is charged, other high-voltage lines will also generate an electric field), so even when the object to be measured is not charged, the sensor will detect To the electric field, thereby affecting the accuracy of detection, there are potential safety hazards.

Contents of the invention

In order to solve the problem in the prior art that even when the object to be tested is not charged, the sensor will detect the electric field, thereby affecting the accuracy of the detection and posing potential safety hazards, the embodiment of the present invention provides a non-contact electroscope and electroscope method. Described technical scheme is as follows:

On the one hand, an embodiment of the present invention provides a non-contact electroscope, and the electroscope includes:

The sensing module is used to detect the electric field strength of the object to be measured;

The sensing module includes an electric field sensor;

a ranging module, configured to detect the distance from the electroscope to the object to be measured;

A processing module, configured to determine whether the object to be measured is charged according to the measured distance from the electroscope to the object to be measured and the measured electric field strength;

The electroscope also includes: a metal sleeve covering the electric field sensor, the metal sleeve is provided with a hole for limiting the signal receiving range of the electric field sensor;

The metal sleeve includes a lower sleeve and an upper sleeve that can slide along the lower sleeve, one end of the lower sleeve is slidably connected to one end of the upper sleeve, and the other end of the upper sleeve is provided with The other end of the hole and the lower sleeve is provided with the electric field sensor.

In another implementation manner of the embodiment of the present invention, the distance measuring module includes a laser distance meter.

In another implementation manner of the embodiment of the present invention, the electroscope further includes: a driving device, configured to drive the upper sleeve to slide along the lower sleeve, so as to change the signal reception of the electric field sensor scope;

Correspondingly, the processing module is further configured to control the driving device to adjust the signal receiving range of the electric field sensor to a predetermined value according to the distance from the electroscope to the object to be measured.

In another implementation manner of the embodiment of the present invention, the electroscope further includes: an alarm module, configured to issue an audible and visual alarm when the object to be measured is electrified.

In another implementation manner of the embodiment of the present invention, the electroscope further includes: a transmission module arranged between the sensing module and the processing module, and the transmission module includes: a follower circuit, a filter circuit, a rectifier circuits and analog-to-digital converters.

On the other hand, the embodiment of the present invention also provides a non-contact electrometry method, the method comprising:

Detect the electric field strength of the object to be measured;

Detecting the distance from the electroscope to the object to be measured;

judging whether the object to be measured is charged according to the measured distance from the electroscope to the object to be measured and the measured electric field strength;

The detection of the electric field strength of the object to be measured includes: using an electric field sensor to detect the electric field strength of the object to be measured, the electric field sensor is covered with a metal sleeve, and the metal sleeve is provided with a hole for limiting the signal receiving range of the electric field sensor ;

The metal sleeve includes a lower sleeve and an upper sleeve that can slide along the lower sleeve, one end of the lower sleeve is slidably connected to one end of the upper sleeve, and the other end of the upper sleeve is provided with The other end of the hole and the lower sleeve is provided with the electric field sensor.

In an implementation manner of the embodiment of the present invention, before the detecting the electric field strength of the object to be measured, the method further includes: adjusting the receiving range of the electric field to a predetermined value.

The beneficial effects brought by the technical solution provided by the embodiments of the present invention are:

By detecting the electric field strength of the object to be measured and the distance from the electroscope to the object to be measured, it is judged whether the object to be measured is charged or not, and the electric field generated by the objects around the object to be measured is avoided, which affects the detection of the electric field strength of the object to be measured , improve the detection accuracy and eliminate potential safety hazards.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic structural diagram of a non-contact electroscope provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic structural view of the metal sleeve outside the electric field sensor provided by Embodiment 1 of the present invention;

Fig. 3 is a flow chart of the non-contact electrometry method provided by the second embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

The embodiment of the present invention provides a non-contact electroscope, which is especially suitable for conducting electrical inspection on ultra-high voltage objects to be tested, such as high-voltage lines, as shown in Figure 1-2. The electroscope includes:

Induction module 101, used to detect the electric field strength of the object to be measured;

A ranging module 102, configured to detect the distance from the electroscope to the object to be measured;

The processing module 103 is configured to determine whether the object to be measured is charged according to the measured distance from the electroscope to the object to be measured and the measured electric field strength.

Specifically, the processing module 103 obtains the preset electric field strength corresponding to the measured distance from the electroscope to the object to be measured according to the corresponding relationship between the distance and the electric field strength, and compares the measured electric field strength with the preset electric field strength. When the measured electric field strength is greater than the preset electric field strength, the judgment result is that the object under test is charged, and when the measured electric field strength is smaller than the preset electric field strength, the judgment result is that the object under test is not charged.

Preferably, the sensing module 101 may include an electric field sensor 111 . The electric field sensor is a capacitive sensing design. Taking the high-voltage line as an example, the high-voltage line generates an alternating electric field after being pressurized, and the electric field sensor in the alternating electric field will generate an induced charge, thereby forming a voltage, and the electric field strength of the object to be measured can be obtained according to the voltage.

In order to prevent the rain from reducing the sensitivity of the sensor, the electric field sensor can adopt a hemispherical smooth shell.

Preferably, the distance measuring module 102 may include a laser range finder.

During the actual detection, there will be electric field interference generated by other objects around the object to be tested. For example, when detecting whether one of the multi-circuit high-voltage lines is charged, the electric field generated by other circuits will affect the detection, even if the detected circuit is actually not charged. Yes, the electric field intensity detected by the electric field sensor is still relatively large. In order to avoid this interference, we can use the relationship between the voltage U and the electric field strength E: E=U/d, where d is the distance between the location where the electric field strength is measured and the object to be measured, where U is fixed for high voltage lines , so the corresponding relationship between distance and electric field strength can be obtained.

Therefore, when the ranging module 102 measures the distance, we can find the preset electric field strength from the above correspondence. When the electric field strength measured by the sensing module 101 is smaller than the preset electric field strength, it means that the high-voltage line is not charged, otherwise the high-voltage line charged.

Wherein, the processing module 103 may include a single-chip microcomputer.

Further, the electroscope further includes: a transmission module 104 disposed between the sensing module 101 and the processing module 103, and the transmission module 104 includes: a follower circuit, a filter circuit, a rectification circuit and an analog-to-digital converter. The electric field sensor outputs a power frequency AC voltage signal, which is filtered after being followed by a follower circuit and forward biased, and then converted to DC by a rectifier circuit, and then input into a microcontroller through an analog-to-digital converter.

Further, the electroscope also includes: an alarm module 105, configured to issue an audible and visual alarm when the object to be measured is electrified.

Specifically, the alarm module 105 may include: a buzzer and a light emitting diode. The processing module 103 controls the alarm module 104 to perform an audible and visual alarm when judging that the object to be detected has a point.

Further, the electroscope also includes: a metal sheath 112 covering the electric field sensor, and the metal sheath 112 is provided with a hole for limiting the signal receiving range of the electric field sensor.

Further, the metal sleeve 112 includes: a lower sleeve and an upper sleeve that can slide along the lower sleeve, one end of the lower sleeve is slidably connected to one end of the upper sleeve, the other end of the upper sleeve is provided with a hole, and the lower sleeve The other end of the barrel is provided with an electric field sensor. By sliding the upper sleeve, the distance from the electric field sensor to the hole can be changed, thereby changing the signal receiving range of the electric field sensor. By controlling the signal receiving range of the electric field sensor, the interference received by the electric field sensor is smaller, so that the detection result is more accurate.

Referring to Fig. 2, take the outer metal sleeve 112 on the electric field sensor 111 to have a circular small hole 113, and the object to be measured is a high voltage line 114 as an example, the farther the distance from the electroscope to the high voltage line, the larger the signal receiving range of the electric field sensor, The signal receiving range is expressed by: the electric field sensor 111 and every point on the edge of the small hole on the metal sleeve 112 are connected to form a ray, and the length of the high voltage line intercepted by the two ray lines is represented. When the measured distance from the electroscope to the high-voltage line is d, the predetermined value of the preset signal receiving range is a, and the diameter of the small hole is r, the length x of the metal sleeve can be calculated, because a/d=r/x , so x=dr/a.

Preferably, the metal sheath 112 can be provided with a scale used to indicate the length. After the length x of the metal sheath 112 is calculated, it can be adjusted according to the scale on the metal sheath 112 so that the length of the metal sheath 112 is equal to x.

Further, the device further includes: a driving device for driving the upper sleeve to slide along the lower sleeve to change the signal receiving range of the electric field sensor;

The processing module is also used to control the driving device to adjust the signal receiving range of the electric field sensor 111 to a predetermined value according to the distance from the electroscope to the object to be measured. The processing module may use the above method to calculate the value of x, and set the value of x to a predetermined value.

The embodiment of the present invention judges whether the object to be tested is electrified by detecting the electric field strength of the object to be tested and the distance from the electroscope to the object to be tested, so as to avoid the electric field generated by the objects existing around the object to be tested, and has great influence on the detection of the object to be tested. The influence of electric field strength improves the detection accuracy and eliminates potential safety hazards.

Embodiment two

An embodiment of the present invention provides a non-contact electrical inspection method, which is especially suitable for electrical inspection of ultra-high voltage objects to be tested such as high-voltage lines, see Figure 2, the method includes:

Step 201: Detect the electric field strength of the object to be measured;

Step 202: Detect the distance from the electroscope to the object to be measured;

Step 203: According to the measured distance from the electroscope to the object to be measured and the measured electric field strength, determine whether the object to be measured is charged.

Specifically, according to the corresponding relationship between the distance and the electric field strength, the preset electric field strength corresponding to the measured distance from the electroscope to the object to be measured is obtained, and the measured electric field strength is compared with the preset electric field strength. When the measured When the electric field intensity is greater than the preset electric field intensity, the judgment result is that the object to be measured is charged, and when the measured electric field strength is smaller than the preset electric field strength, the judgment result is that the object to be measured is not charged.

Specifically, the electric field strength can be detected by an electric field sensor. The distance can be detected by a laser range finder.

During the actual detection, there will be electric field interference generated by other objects around the object to be tested. For example, when detecting whether one of the multi-circuit high-voltage lines is charged, the electric field generated by other circuits will affect the detection, even if the detected circuit is actually not charged. Yes, the electric field intensity detected by the electric field sensor is still relatively large. In order to avoid this interference, we can use the relationship between the voltage U and the electric field strength E: E=U/d, where d is the distance between the location where the electric field strength is measured and the object to be measured, where U is fixed for high voltage lines , so the corresponding relationship between distance and electric field strength can be obtained.

Therefore, when the distance is measured, we can find the preset electric field strength from the above correspondence. When the measured electric field strength is smaller than the preset electric field strength, it means that the high-voltage line is not charged, otherwise the high-voltage line is charged.

When the high-voltage object is electrified, it will give an audible and visual alarm.

Further, before detecting the electric field strength of the object to be measured, the method further includes: adjusting the receiving range of the electric field to a predetermined value.

For example, when the electric field sensor is used to detect the electric field intensity of the object to be measured, a metal sleeve is covered on the electric field sensor, and the metal sleeve is provided with holes for limiting the signal receiving range of the electric field sensor. One end of the metal sleeve is provided with a hole, and the other end is provided with an electric field sensor. By changing the length of the metal sleeve, the distance from the electric field sensor to the hole can be changed, thereby changing the signal receiving range of the electric field sensor. By controlling the signal receiving range of the electric field sensor, the interference received is smaller, so that the detection result is more accurate.

Referring to Fig. 2, take the outer metal sleeve 112 on the electric field sensor 111 to have a circular small hole 113, and the object to be measured is a high voltage line 114 as an example, the farther the distance from the electroscope to the high voltage line, the larger the signal receiving range of the electric field sensor, The signal receiving range is represented by the length of the high-voltage line intercepted by the electric field sensor and each point on the edge of the small hole on the metal sleeve to form a ray. When the measured distance from the electroscope to the high-voltage line is d, the preset signal receiving range is a, and the diameter of the small hole is r, the length x of the metal sleeve can be calculated, because a/d=r/x, so x =dr/a.

The embodiment of the present invention judges whether the object to be tested is electrified by detecting the electric field strength of the object to be tested and the distance from the electroscope to the object to be tested, and avoids the electric field generated by the objects existing around the object to be tested, which is beneficial to the detection of the object to be tested. The influence of electric field strength improves the detection accuracy and eliminates potential safety hazards.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (7)

1. a non-contact type electricity checking device, is characterized in that, described electroscope comprises:

Induction module, for detecting the electric field intensity of object under test;

Described induction module comprises electric-field sensor;

Range finder module, for detecting the distance of described electroscope to described object under test;

Processing module, for the electric field intensity recorded to the Distance geometry of described object under test according to the described electroscope that records, judges that whether described object under test is charged;

Described electroscope also comprises: cover on the metallic sheath outside described electric-field sensor, and described metallic sheath is provided with the hole of the Signal reception scope for limiting described electric-field sensor;

The upper bush that described metallic sheath comprises lower sleeve and can slide along described lower sleeve, one end of described lower sleeve and one end of described upper bush are slidably connected, and the other end of described upper bush is provided with described hole, and the other end of described lower sleeve is provided with described electric-field sensor.

2. electroscope according to claim 1, is characterized in that, described range finder module comprises laser range finder.

3. electroscope according to claim 1, is characterized in that, described electroscope also comprises: driving arrangement, for driving described upper bush to slide along described lower sleeve, to change the described Signal reception scope of described electric-field sensor;

Correspondingly, described processing module also for, according to the distance of described electroscope to described object under test, control described driving arrangement and adjust the described Signal reception scope of described electric-field sensor to predetermined value.

4. electroscope according to claim 1, is characterized in that, described electroscope also comprises: alarm module, for when described object under test is charged, carries out sound and light alarm.

5. electroscope according to claim 1, it is characterized in that, described electroscope also comprises: be located at the transport module between described induction module and described processing module, and described transport module comprises: follow circuit, filtering circuit, rectification circuit and analog to digital converter.

6. a non-contact type electricity checking method, is characterized in that, described method comprises:

Detect the electric field intensity of object under test;

Detect the distance of electroscope to described object under test;

According to the electric field intensity that the described electroscope recorded records to the Distance geometry of described object under test, judge that whether described object under test is charged;

The electric field intensity of described detection object under test comprises: adopt electric-field sensor to detect the electric field intensity of object under test, described electric-field sensor is covered with a metallic sheath, and described metallic sheath is provided with the hole of the Signal reception scope for limiting described electric-field sensor;

The upper bush that described metallic sheath comprises lower sleeve and can slide along described lower sleeve, one end of described lower sleeve and one end of described upper bush are slidably connected, and the other end of described upper bush is provided with described hole, and the other end of described lower sleeve is provided with described electric-field sensor.

7. method according to claim 6, is characterized in that,

Before the electric field intensity of described detection object under test, described method also comprises: adjustment electric field reception scope is to predetermined value.