CN220603562U

CN220603562U - Hidden danger discharge signal acquisition and filter circuit for cable collector circuit

Info

Publication number: CN220603562U
Application number: CN202322211481.8U
Authority: CN
Inventors: 马铁
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-03-15
Anticipated expiration: 2033-08-15

Abstract

The utility model discloses a hidden danger discharge signal acquisition and filter circuit of a cable collecting circuit, which comprises a band-stop filter circuit and a negative feedback second-order band-pass filter circuit; the band elimination filter circuit comprises a high-pass filter circuit and a low-pass filter circuit, wherein the output end of the high-pass filter circuit is connected with the input end of the low-pass filter circuit, the output end of the low-pass filter circuit is connected with the input end of the second-order band-pass filter circuit, the band elimination filter circuit is used for carrying out first processing on the collected original signals, the second-order band-pass filter circuit is used for carrying out second processing on the original signals and collecting and analyzing hidden danger signals, the original signals comprise power frequency signals, fundamental wave signals, harmonic signals and traveling wave signals, and the hidden danger signals are high-frequency low-amplitude traveling wave signals. According to the hidden danger discharge signal acquisition and filter circuit, the hidden danger discharge signal acquisition and filter circuit is provided, so that the hidden danger discharge signal acquisition and analysis capability of the monitoring device is improved, and the hidden danger discharge signal acquisition accuracy of the current collecting circuit cable is improved.

Description

Hidden danger discharge signal acquisition and filter circuit for cable collector circuit

Technical Field

The utility model relates to the technical field of circuit hidden danger signal acquisition, in particular to a cable collector circuit hidden danger discharge signal acquisition filter circuit.

Background

In recent years, new energy industry is developed by national reason, so wind power plants and photovoltaic field current collection lines are greatly developed, potential discharge or fault tripping of the lines is caused by the fact that cable lines in the current collection lines are subjected to perennial underground humid environment, natural disasters, accidental external damage and the like, but faults cannot be rapidly identified and judged in a manual line inspection mode due to the fact that the cable lines are deeply buried underground, on the other hand, the current collection line structure is generally in a radial shape, meanwhile, cable overhead lines in the current collection line are complex, and no clear fault and hidden trouble investigation scheme exists at present.

When the hidden danger of the cable line discharges, on the one hand, the discharging rule of the cable line shows periodicity, on the other hand, the discharging amplitude is smaller and the frequency is higher, and when the collecting line cable fault collecting sensor based on the traveling wave monitors the state of the collecting line cable, the collecting frequency is wider, and the power frequency signal, the fundamental wave signal, the harmonic wave signal and the traveling wave signal in the collecting line cable are always collected at the same time, so that the hidden danger discharging signal is ignored or interfered by the harmonic wave signal when the signal collected by the monitoring device analyzes the collecting line cable.

Disclosure of Invention

The utility model aims to provide a hidden danger discharge signal acquisition and filter circuit of a cable collector circuit, and aims to solve the technical problem that hidden danger discharge signals are easily ignored or interfered by harmonic signals when a monitoring device is used for acquiring models in the prior art.

In order to achieve the above object, the present utility model provides the following technical solutions:

the potential discharge signal acquisition and filtering circuit for the cable collecting circuit is characterized by comprising a band-stop filter circuit and a negative feedback second-order band-pass filter circuit; the band elimination filter circuit comprises a high-pass filter circuit and a low-pass filter circuit, wherein the output end of the high-pass filter circuit is connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is connected with the input end of the negative feedback second-order band-pass filter circuit.

Preferably, the band-reject filter circuit is configured to perform a first processing on the collected raw signal; the negative feedback second-order band-pass filter circuit is used for carrying out second processing on the original signal and collecting and analyzing hidden danger signals.

Preferably, the original signal comprises a power frequency signal, a fundamental wave signal, a harmonic wave signal and a traveling wave signal.

Preferably, the hidden danger signal is a traveling wave signal with high frequency and low amplitude.

Preferably, the high-pass filter circuit comprises a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and an operational amplifier A1; the low-pass filter loop comprises a diode D1, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier A2.

Preferably, the negative feedback second-order band-pass filter circuit comprises a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R10, a resistor R11, a resistor R12, a chip A3 and direct current DC.

Preferably, the operational amplifier A1 and the operational amplifier A2 are ICL7650 operational amplifiers.

Preferably, the chip A3 is an AD8052 series chip.

Preferably, the direct current DC is a 7.2V direct current power supply.

Preferably, the resistor is in the kΩ stage and the capacitor is in the μf stage.

The utility model has the following beneficial effects:

(1) The sensing integration of the power frequency signal and the traveling wave signal collection is realized, and the collection cost of the monitoring device is reduced;

(2) The fundamental wave part and the harmonic wave part in the signal are effectively eliminated, the false alarm rate of the monitoring device is reduced, and the accuracy of the system is improved;

(3) The interference of electromagnetic noise possibly occurring in the acquisition system is eliminated by utilizing the cooperation of the two filters, so that the quick identification of hidden danger discharge is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic diagram of a signal acquisition process according to the present utility model;

fig. 2 is a schematic circuit structure of the present utility model.

Detailed Description

Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

Example 1

As shown in fig. 1 to 2, a potential discharge signal acquisition and filtering circuit of a cable collector circuit is characterized by comprising a band-stop filter circuit and a negative feedback second-order band-pass filter circuit; the band elimination filter circuit comprises a high-pass filter circuit and a low-pass filter circuit, wherein the output end of the high-pass filter circuit is connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is connected with the input end of the negative feedback second-order band-pass filter circuit.

Further, the band-reject filter circuit is configured to perform a first processing on the collected original signal; the negative feedback second-order band-pass filter circuit is used for carrying out second processing on the original signal and collecting and analyzing hidden danger signals. The band-stop filter circuit processes the collected original signals, removes fundamental wave signals and partial harmonic signals, isolates high-frequency signals and low-frequency signals, the low-frequency signals enter the power frequency loop, the high-frequency signals enter the traveling wave signals, the negative feedback second-order band-pass filter circuit processes the original signals processed by the band-stop filter circuit, removes residual harmonic signals and partial low-frequency traveling wave signals, and collects and analyzes hidden danger discharge signals in the signals. The original signals comprise power frequency signals, fundamental wave signals, harmonic wave signals and traveling wave signals; the hidden danger discharge signal is a traveling wave signal with high frequency and low amplitude. The circuit of the utility model is provided with a band elimination filter circuit, the fundamental wave signal and part of harmonic wave signal collected in the monitoring device are separated, the low-pass part enters the power frequency loop, the high-pass part enters the traveling wave signal, the traveling wave signal of the high-pass part is processed, and the traveling wave signal of the high-pass part enters the multi-path negative feedback second-order band-pass filter circuit, thereby realizing the complete separation of the harmonic wave signal, collecting and analyzing the hidden danger signal in the current collecting circuit, and effectively improving the capability of the monitoring device for collecting and analyzing the hidden danger discharge signal and the collection accuracy of the hidden danger discharge signal of the cable of the current collecting circuit through multiple filtering.

Further, as shown in fig. 2, the band-stop filter circuit includes a high-pass filter loop and a low-pass filter loop. The band-stop filter circuit comprises a diode D1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, an operational amplifier A1 and an operational amplifier A2. The capacitor C1, the capacitor C2, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5 and the operational amplifier A1 form a high-pass filter loop; one end of a resistor R1 is connected with a voltage input end, the other end of the resistor R1 is connected with one end of a capacitor C1, one end of a capacitor C2 and one end of a resistor R2, the other end of the resistor R2 is grounded, the other end of the capacitor C1 and the other end of the capacitor C2 are respectively connected with two ends of a resistor R4, one end of the resistor R4 connected with the capacitor C2 is connected with an inverting input end of an operational amplifier A1, a normal phase input end of the operational amplifier A1 is connected with one end of a resistor R3, the other end of the resistor R3 is grounded, one end of the resistor R4 connected with the capacitor C1 is connected with an output end of the operational amplifier A1, and one end of a resistor R5 is connected with an output end of the operational amplifier A1. The diode D1, the resistor R6, the resistor R7, the resistor R8 and the operational amplifier A2 form a low-pass filter loop; one end of the resistor R6 is connected with the voltage input end, the other end is connected with one end of the resistor R7, one end of the resistor R6 connected with the resistor R7 is connected with the other end of the resistor R5 and the inverting input end of the operational amplifier A2, the non-inverting input end of the operational amplifier A2 is connected with one end of the resistor R8, the other end of the resistor R8 is grounded, and two ends of the diode D1 are respectively connected with the other end of the resistor R7 and the output end of the operational amplifier A2. The lower limit frequency of the high pass filter loop is set to 10kHz, that is, a signal with a frequency higher than 10kHz can pass through the high pass filter loop, and the upper limit frequency of the low pass filter loop is set to 1kHz, that is, a signal with a frequency lower than 1kHz can pass through the low pass filter loop.

Further, as shown in fig. 2, the negative feedback second-order bandpass filter circuit includes a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R10, a resistor R11, a resistor R12, a chip A3, and a direct current DC. One end of a capacitor C3 is connected with one end of a resistor R9, the other end of the resistor R9 is connected with one end of a capacitor C4 and one end of a capacitor C5, the other ends of the capacitor C4 and the capacitor C5 are respectively connected with two ends of a resistor R10, one end of the capacitor C4 connected with the capacitor R10 is connected with a normal phase input end of a chip A3, one end of a resistor R12 is connected with one end of a resistor R11 and an opposite phase input end of the chip A3, the other end of the resistor R12 is grounded, a capacitor C7 is connected with the resistor R12 in parallel, the other end of the resistor R11 is connected with one end of a capacitor C8, the capacitor C9 and one end of direct current DC, the other end of the capacitor C8 is connected with the capacitor C9 in parallel and the other end of the capacitor C is grounded, the other end of the direct current DC is grounded, the output end of the chip A3 is connected with one end of the capacitor C6, and the other end of the capacitor C6 is connected with a voltage output end. The lower limit frequency of the negative feedback second-order band-pass filter circuit is 50kHz, namely, a signal with the frequency more than or equal to 50kHz can pass through the negative feedback second-order band-pass filter circuit.

Further, the operational amplifier A1 and the operational amplifier A2 are ICL7650 operational amplifiers. ICL7560 is chopper stabilized high-precision operational amplifier, has the characteristics of small input bias current, small offset, high gain, strong common mode rejection capability, quick response, low drift, stable performance, low price and the like.

Further, the chip A3 is an AD8052 series chip. AD8052 is a low-cost and high-speed voltage feedback type amplifier, provides excellent overall performance and flexible functions while reducing cost, and has the characteristics of low distortion and quick establishment.

Further, the direct current DC is a direct current power supply of 7.2V.

Furthermore, the resistor adopts a k omega level, the capacitor adopts a mu F level, and the impedance matching of the system can be ensured.

In the description of the present utility model, it should be understood that the terms "middle," "length," "upper," "lower," "front," "rear," "vertical," "horizontal," "inner," "outer," "radial," "circumferential," and the like indicate an orientation or a positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.

In the present utility model, unless expressly stated or limited otherwise, a first feature "on" a second feature may be that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intervening medium. The meaning of "a plurality of" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The above description is for the purpose of illustrating the embodiments of the present utility model and is not to be construed as limiting the utility model, but is intended to cover all modifications, equivalents, improvements and alternatives falling within the spirit and principles of the utility model.

Claims

1. The potential discharge signal acquisition and filtering circuit for the cable collecting circuit is characterized by comprising a band-stop filter circuit and a negative feedback second-order band-pass filter circuit; the band elimination filter circuit comprises a high-pass filter circuit and a low-pass filter circuit, wherein the output end of the high-pass filter circuit is connected with the input end of the low-pass filter circuit, and the output end of the low-pass filter circuit is connected with the input end of the negative feedback second-order band-pass filter circuit.

2. The filter circuit for collecting the hidden discharge signals of the cable collection line according to claim 1, wherein the band-stop filter circuit is used for carrying out first processing on the collected original signals; the negative feedback second-order band-pass filter circuit is used for carrying out second processing on the original signal and collecting and analyzing hidden danger signals.

3. The electric cable collector line hidden trouble discharge signal acquisition and filter circuit according to claim 2, wherein the original signals comprise power frequency signals, fundamental wave signals, harmonic signals and traveling wave signals.

4. A cable collector line hidden trouble discharge signal collection filter circuit according to claim 3 wherein the hidden trouble signal is a traveling wave signal of high frequency and low amplitude.

5. The hidden discharge signal acquisition and filtering circuit of the cable collection line according to claim 1, wherein the high-pass filtering circuit comprises a capacitor C1, a capacitor C2, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and an operational amplifier A1; the low-pass filter loop comprises a diode D1, a resistor R6, a resistor R7, a resistor R8 and an operational amplifier A2.

6. The circuit of claim 1, wherein the negative feedback second-order bandpass filter circuit comprises a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a resistor R10, a resistor R11, a resistor R12, a chip A3, and a direct current DC.

7. The filter circuit for collecting the discharge signals of the hidden danger of the cable collecting circuit according to claim 5, wherein the operational amplifier A1 and the operational amplifier A2 are ICL7650 operational amplifiers.

8. The filter circuit for collecting the discharge signals of the hidden danger of the cable collecting circuit according to claim 6, wherein the chip A3 is an AD8052 series chip.

9. The cable collector line hidden discharge signal acquisition and filter circuit according to claim 6, wherein the direct current DC is a 7.2V direct current power supply.

10. The filter circuit for collecting the discharge signals of the hidden danger of the cable collecting circuit according to claim 5 or 6, wherein the resistor adopts a k omega level and the capacitor adopts a mu F level.