CN106705937A - Differential-capacitor-based voltage tower inclination monitoring system and method - Google Patents

Abstract

The invention provides a high-voltage tower tilt monitoring system based on differential capacitance, including a signal generation unit and a resonance unit, which are used to receive the AC signal generated by the signal generation unit into resonance and output a resonance signal; a detection unit is used to receive the resonance The resonant signal output by the unit, and judge whether the high-voltage tower is tilted according to the frequency change of the resonant signal; the resonant unit includes a coil L1, a capacitor C1 and two plate capacitors, and the first plates of the two plate capacitors are fixed on the two sides of the high-voltage tower. side and parallel to each other; the second plates of the two plate capacitors are set opposite to the first plates of their respective capacitors; one end of the coil L1 is connected to the output end of the signal generating unit, and the other end is grounded through the capacitor C1, and the coil L1 and the The common connection point between the capacitors C1 is connected to the second plate of one of the plate capacitors, the second plate of the other plate capacitor is grounded, and the common connection point of the coil L1 and the capacitor C1 is used as the output end of the resonance unit; it can be used for high voltage The inclination state of the tower is accurately monitored.

Description

Voltage tower tilt monitoring system and method based on differential capacitance

technical field

The invention relates to monitoring equipment and a method for electric equipment, in particular to a voltage tower tilt monitoring system and method based on differential capacitance.

Background technique

The high-voltage tower is a device used to support power supply equipment such as transmission lines and insulators in the transmission network. The stability of the high-voltage tower is related to the safe operation of the transmission network. Therefore, it is necessary to accurately monitor the state of the high-voltage tower, especially the tilted state. It must be repaired immediately, otherwise it will cause a serious power outage and cause serious economic losses; in the prior art, whether the high-voltage tower is tilted is generally detected manually, which is inefficient and poor in real-time, and manual inspections are periodic For sex work, there are often cases where the tower is tilted and manual inspections are not in place. Although people have also proposed an online detection method, the monitoring results are inaccurate due to the large interference of the environment.

Therefore, it is necessary to propose a new high-voltage tower tilt monitoring system, which can accurately monitor the tilt state of high-voltage towers, eliminate environmental interference, facilitate grid dispatching to make accurate countermeasures, and effectively reduce manpower and material costs and improve monitoring efficiency. , and has strong real-time performance.

Contents of the invention

In view of this, the purpose of the present invention is to provide a high-voltage tower tilt monitoring system based on differential capacitance, which can accurately monitor the tilt state of high-voltage towers, eliminate environmental interference, and facilitate grid dispatching to make accurate countermeasures, and effectively reduce It saves manpower and material costs, improves monitoring efficiency, and has strong real-time performance.

The present invention provides a high-voltage tower tilt monitoring system based on differential capacitance, including:

A signal generating unit for generating and outputting a sinusoidal AC signal;

The resonance unit is used to receive the AC signal generated by the signal generating unit into resonance and output the resonance signal;

The detection unit is used to receive the resonance signal output by the resonance unit, and judge whether the high-voltage tower is tilted according to the frequency change of the resonance signal;

The resonant unit includes a coil L1, a capacitor C1 and two plate capacitors. The first plates of the two plate capacitors are fixed on both sides of the high-voltage tower and are parallel to each other; the second plates of the two plate capacitors are respectively facing The first plate of each capacitor is set; one end of the coil L1 is connected to the output end of the signal generating unit, the other end is grounded through the capacitor C1, and the common connection point between the coil L1 and the capacitor C1 is connected to the second plate of one of the plate capacitors connected, the second plate of the other plate capacitor is grounded, and the common connection point of the coil L1 and the capacitor C1 is used as the output end of the resonant unit.

Further, the signal generation unit includes:

A signal generating circuit, used to generate and output a sinusoidal AC signal;

The power amplifier circuit is used to amplify the sinusoidal AC signal output by the signal generating circuit and output the amplified signal;

The coupler is used to load the amplified signal at the output end of the power amplifying circuit to the resonant unit.

Further, the coupler is a transformer with a transformation ratio of 1:1.

Further, the signal generation unit further includes a filter circuit I, the input end of the filter circuit I is connected to the output end of the power amplifier circuit, and the output end of the filter circuit I is connected to the input end of the coupler.

Further, the detection unit includes:

A rectifier circuit, the input end of which is connected to the output end of the resonance unit, is used to rectify the resonance signal output by the resonance circuit and output a DC signal;

filter circuit II, the input end of which is connected to the output end of the rectification circuit, and is used for filtering the DC signal of the rectification circuit;

A frequency detection circuit, the input end of which is connected to the output end of the filter circuit, is used for frequency detection of the signal output by the filter circuit;

The central processing circuit is used for receiving the frequency signal output by the frequency detection circuit and judging whether the frequency changes, and outputting alarm information if there is a change.

Correspondingly, the present invention also provides a method for monitoring the inclination of a high-voltage tower based on differential capacitance, including the following steps:

S1. Arrange differential capacitors on the high-voltage tower: the differential capacitor is composed of two plate capacitors. The first plates of the two plate capacitors are fixed on both sides of the high-voltage tower and parallel to each other; the second plates of the two plate capacitors are respectively are set with respect to the first plates of the respective capacitors;

S2. Connect the differential capacitor to the LC resonant circuit;

S3. Input a sinusoidal AC signal to the LC resonant circuit from the signal generating unit;

S4. The frequency output by the LC resonant circuit is detected by the signal detection unit, and the initial frequency is recorded as the reference frequency, and the measured frequency after the initial frequency is compared with the initial frequency. If the difference between the initial frequency and the measured frequency is greater than the set range, Then it is judged that the high pressure tower is tilted.

Beneficial effects of the present invention: through the system and method of the present invention, it is possible to accurately monitor the inclination state of the high-voltage pole tower, eliminate environmental interference, facilitate power grid dispatching to make accurate countermeasures, and effectively reduce manpower and material costs and improve monitoring efficiency , and has strong real-time performance.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

FIG. 1 is a schematic diagram of a differential capacitance arrangement structure of the present invention.

Fig. 2 is a schematic diagram of the present invention.

detailed description

Fig. 1 is a schematic diagram of the arrangement structure of differential capacitors of the present invention, and Fig. 2 is a schematic diagram of the present invention, as shown in the figure, a kind of high-voltage tower tilt monitoring system based on differential capacitors provided by the present invention includes:

A signal generating unit for generating and outputting a sinusoidal AC signal;

The resonance unit is used to receive the AC signal generated by the signal generating unit into resonance and output the resonance signal;

The detection unit is used to receive the resonance signal output by the resonance unit, and judge whether the high-voltage tower is tilted according to the frequency change of the resonance signal;

The resonant unit includes a coil L1, a capacitor C1, and two plate capacitors. The first plates 2 of the two plate capacitors are fixed on both sides of the high-voltage tower 1 and are parallel to each other; the second plate 3 of the two plate capacitors They are respectively arranged opposite to the first plates 2 of the respective capacitors; one end of the coil L1 is connected to the output end of the signal generating unit, the other end is grounded through the capacitor C1, and the common connection point between the coil L1 and the capacitor C1 is connected to one of the plate capacitors The second plate is connected, the second plate of the other plate capacitor is grounded, and the common connection point of the coil L1 and the capacitor C1 is used as the output end of the resonance unit. The layout of the differential capacitor is shown in Figure 1, where the first plate capacitor The two pole plates are fixed by the existing method, so as to ensure that the distance between the pole plate parts is also fixed, and this arrangement can effectively suppress the influence of environmental factors on the monitoring results; through the above structure, the tilt state of the high-voltage tower can be adjusted Accurate monitoring and elimination of environmental interference are conducive to grid dispatching to make accurate countermeasures, and effectively reduce manpower and material costs, improve monitoring efficiency, and have strong real-time performance; among them, in Figure 2, the differential capacitance is equivalent to capacitance C2.

Wherein, the present invention completes monitoring by following method:

S1. Arrange differential capacitors on the high-voltage tower: the differential capacitor is composed of two plate capacitors. The first plates of the two plate capacitors are fixed on both sides of the high-voltage tower and parallel to each other; the second plates of the two plate capacitors are respectively are set with respect to the first plates of the respective capacitors;

S2. Connect the differential capacitor to the LC resonant circuit;

S3. Input a sinusoidal AC signal to the LC resonant circuit from the signal generating unit;

S4. The frequency output by the LC resonant circuit is detected by the signal detection unit, and the initial frequency is recorded as the reference frequency, and the measured frequency after the initial frequency is compared with the initial frequency. If the difference between the initial frequency and the measured frequency is greater than the set range, Then it is judged that the high-voltage tower is tilted; that is, when the entire system is arranged, the resonant frequency of the resonant circuit is also fixed. Therefore, the monitoring unit uses the frequency of the first monitoring as the reference frequency. At this time, the high-voltage tower does not change. When the high-voltage tower tilts, the high-voltage tower will drive the first plate and the second plate to move relative to each other. According to the formula of plate capacitance The movement of the capacitor plates will cause changes in the facing area between the plates and the distance between the plates, resulting in a change in capacitance, which will affect the resonant frequency. Therefore, the difference between the measured frequency and the initial frequency and the set By comparing the threshold range, it can be judged whether the tower is tilted.

In this embodiment, the signal generation unit includes:

A signal generating circuit for generating and outputting a sinusoidal AC signal; wherein, the signal generating circuit adopts an existing sinusoidal signal generator, such as ML2035, ML2036, etc.;

The power amplifier circuit is used to amplify the sinusoidal AC signal output by the signal generating circuit and output the amplified signal;

The coupler is used to load the amplified signal at the output end of the power amplifier circuit to the resonant unit; the coupler is a transformer with a transformation ratio of 1:1, and this structure can effectively avoid signal distortion and affect the monitoring results; through the above The structure can ensure accurate monitoring of the inclination state of the high-voltage tower.

In this embodiment, the signal generation unit further includes a filter circuit I, the input end of the filter circuit I is connected to the output end of the power amplifier circuit, and the output end of the filter circuit I is connected to the input end of the coupler. Through this structure , which can filter out the clutter signal in the signal output by the power amplifier circuit, so as to improve the accuracy of the final judgment result.

In this embodiment, the detection unit includes:

A rectifier circuit, the input end of which is connected to the output end of the resonance unit, is used to rectify the resonance signal output by the resonance circuit and output a DC signal; the rectification circuit adopts an existing bridge rectification circuit;

filter circuit II, the input end of which is connected to the output end of the rectification circuit, and is used for filtering the DC signal of the rectification circuit;

A frequency detection circuit, the input end of which is connected to the output end of the filter circuit, is used for frequency detection of the signal output by the filter circuit, wherein the frequency detection circuit adopts CY8C29666 chip, LM2917 chip, etc.;

The central processing circuit is used to receive the frequency signal output by the frequency detection circuit and judge whether the frequency changes. If there is a change, it will output an alarm message. The central processing circuit adopts an existing embedded processing circuit, such as the STM32 series microcontroller; of course, the detection unit GPRS module and GPS positioning circuit can also be set. When the high-voltage tower tilts, the central processing circuit obtains the current location information from the GPS positioning circuit, and sends the current location information and alarm information to the server of the monitoring center, so that the monitoring center can find out in time Corresponding police information is conducive to timely maintenance and inspection measures.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (6)

1. A high-voltage tower tilt monitoring system based on differential capacitance, characterized in that: comprising: A signal generating unit for generating and outputting a sinusoidal AC signal; The resonance unit is used to receive the AC signal generated by the signal generating unit into resonance and output the resonance signal; The detection unit is used to receive the resonance signal output by the resonance unit, and judge whether the high-voltage tower is tilted according to the frequency change of the resonance signal; The resonant unit includes a coil L1, a capacitor C1 and two plate capacitors. The first plates of the two plate capacitors are fixed on both sides of the high-voltage tower and are parallel to each other; the second plates of the two plate capacitors are respectively facing The first plate of each capacitor is set; one end of the coil L1 is connected to the output end of the signal generating unit, the other end is grounded through the capacitor C1, and the common connection point between the coil L1 and the capacitor C1 is connected to the second plate of one of the plate capacitors connected, the second plate of the other plate capacitor is grounded, and the common connection point of the coil L1 and the capacitor C1 is used as the output end of the resonant unit. 2. The high-voltage tower tilt monitoring system based on differential capacitance according to claim 1, characterized in that: the signal generating unit comprises: A signal generating circuit, used to generate and output a sinusoidal AC signal; The power amplifier circuit is used to amplify the sinusoidal AC signal output by the signal generating circuit and output the amplified signal; The coupler is used to load the amplified signal at the output end of the power amplifying circuit to the resonant unit. 3. The voltage tower tilt monitoring system based on differential capacitance according to claim 2, characterized in that: the coupler is a transformer with a transformation ratio of 1:1. 4. The voltage tower inclination monitoring system based on differential capacitance according to claim 2, characterized in that: the signal generation unit also includes a filter circuit I, the input end of the filter circuit I and the output end of the power amplifier circuit are filtered The output of circuit I is connected to the input of the coupler. 5. The voltage tower tilt monitoring system based on differential capacitance according to claim 1, characterized in that: the detection unit comprises: A rectifier circuit, the input end of which is connected to the output end of the resonance unit, is used to rectify the resonance signal output by the resonance circuit and output a DC signal; filter circuit II, the input end of which is connected to the output end of the rectification circuit, and is used for filtering the DC signal of the rectification circuit; A frequency detection circuit, the input end of which is connected to the output end of the filter circuit, is used for frequency detection of the signal output by the filter circuit; The central processing circuit is used for receiving the frequency signal output by the frequency detection circuit and judging whether the frequency changes, and outputting alarm information if there is a change. 6. A method for monitoring the inclination of a high-voltage tower based on a differential capacitor, characterized in that: comprising the steps of: S1. Arrange differential capacitors on the high-voltage tower: the differential capacitor is composed of two plate capacitors. The first plates of the two plate capacitors are fixed on both sides of the high-voltage tower and parallel to each other; the second plates of the two plate capacitors are respectively are set with respect to the first plates of the respective capacitors; S2. Connect the differential capacitor to the LC resonant circuit; S3. Input a sinusoidal AC signal to the LC resonant circuit from the signal generating unit; S4. The frequency output by the LC resonant circuit is detected by the signal detection unit, and the initial frequency is recorded as the reference frequency, and the measured frequency after the initial frequency is compared with the initial frequency. If the difference between the initial frequency and the measured frequency is greater than the set range, Then it is judged that the high pressure tower is tilted.