CN212083533U

CN212083533U - Electric signal acquisition device, electric signal detection device and fault indicator

Info

Publication number: CN212083533U
Application number: CN202020321853.6U
Authority: CN
Inventors: 朱俊强; 王家宁
Original assignee: Shenzhen Shengsi Intelligent Technology Co ltd
Current assignee: Shenzhen Shengsi Intelligent Technology Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-12-04
Anticipated expiration: 2030-03-13

Abstract

The electric signal acquisition device comprises a signal acquisition module, a first filtering module, a controllable gain module, an analog modulation module and a first communication module which are sequentially connected; acquiring a preset electric signal of a preset phase of three-phase alternating current to be detected through a signal acquisition module; filtering the preset electric signal through a first filtering module; processing the filtered preset electric signal into an electric signal to be modulated through a controllable gain module; performing analog frequency modulation on an electric signal to be modulated through an analog modulation module to obtain an analog frequency modulation signal corresponding to a preset electric signal; the analog frequency modulation signal is sent to the electric signal detection device through the first communication module, so that the electric signal detection device can accurately detect the state of the three-phase alternating current to be detected based on the analog frequency modulation signal corresponding to the preset electric signal, and the accuracy of electric signal detection is improved.

Description

Electric signal acquisition device, electric signal detection device and fault indicator

Technical Field

The application belongs to the technical field of electronics, especially relates to an electric signal collection system, signal of telecommunication detection device and fault indicator.

Background

The fault indicator is a device installed on a power line for indicating circuit faults, and generally comprises an electric signal acquisition device for acquiring preset electric signals of three-phase alternating current to be detected and an electric signal detection device for detecting the preset electric signals. Generally, the electric signal acquisition device can transmit the acquired preset electric signal to the electric signal detection device in a wireless transmission mode. In the prior art, when the electrical signal acquisition device sends a preset electrical signal to the electrical signal detection device in a wireless transmission manner, the preset electrical signal is digitally modulated to obtain a digital modulation signal corresponding to the preset electrical signal, and then the digital modulation signal is sent to the electrical signal detection device. Due to the fact that frame loss or frame error is prone to occur in the transmission process of the digital modulation signals, the digital modulation signals received by the electric signal detection device cannot accurately represent the preset electric signals, and further deviation exists between the preset electric signals obtained through demodulation and the preset electric signals collected by the electric signal collection device.

SUMMERY OF THE UTILITY MODEL

In view of this, an embodiment of the present application provides an electrical signal acquisition device, an electrical signal detection device, and a fault indicator, so as to solve the problem that when an existing electrical signal acquisition device sends a preset electrical signal to an electrical signal detection device, the preset electrical signal is modulated into a digital modulation signal in a digital modulation manner, and due to the fact that a frame loss or a frame error is easily caused in a transmission process of the digital modulation signal, the digital modulation signal received by the electrical signal detection device cannot accurately represent the preset electrical signal, and the accuracy of electrical signal detection is reduced.

In a first aspect, an embodiment of the present application provides an electrical signal acquisition apparatus, including:

the signal acquisition module is used for acquiring a preset electric signal of a preset phase of the three-phase alternating current to be detected;

the first filtering module is connected with the signal acquisition module and is used for filtering the preset electric signal;

the controllable gain module is connected with the first filtering module and is used for processing the preset electric signal after filtering processing into an electric signal to be modulated according with modulation requirements based on the gain matched with the preset electric signal;

the analog modulation module is connected with the controllable gain module and is used for performing analog frequency modulation on the electric signal to be modulated to obtain an analog frequency modulation signal corresponding to the preset electric signal;

and the first communication module is connected with the analog modulation module and is used for sending the analog frequency modulation signal to the electric signal detection device.

Further, the preset electrical signal comprises a current signal and a voltage signal; accordingly, the signal acquisition module comprises: the device comprises a current signal acquisition unit and a voltage signal acquisition unit;

the current signal acquisition unit is used for acquiring a current signal of a preset phase of the three-phase alternating current to be detected;

the voltage signal acquisition unit is used for acquiring a voltage signal of a preset phase of the three-phase alternating current to be detected.

Further, the first filtering module comprises: a first signal filtering unit and a second signal filtering unit; the input end of the first signal filtering unit is connected with the output end of the current signal acquisition unit, and the input end of the second signal filtering unit is connected with the output end of the voltage signal acquisition unit;

the first signal filtering unit is used for filtering the current signal;

the second signal filtering unit is used for filtering the voltage signal.

Further, the controllable gain module comprises: the gain control device comprises a gain adjusting unit, a first controllable gain unit and a second controllable gain unit; a first control end of the gain adjusting unit is connected with a controlled end of the first controllable gain unit, a second control end of the gain adjusting unit is connected with a controlled end of the second controllable gain unit, an input end of the first controllable gain unit is connected with an output end of the first signal filtering unit, and an input end of the second controllable gain unit is connected with an output end of the second signal filtering unit;

the gain adjusting unit is used for determining a first gain matched with the current signal according to the amplitude of the current signal, adjusting the gain of the first controllable gain unit to be the first gain, determining a second gain matched with the voltage signal according to the amplitude of the voltage signal, and adjusting the gain of the second controllable gain unit to be the second gain;

the first controllable gain unit is used for processing the current signal into a current signal to be modulated according to the first gain;

the second controllable gain unit is used for processing the voltage signal into a voltage signal to be modulated according to the second gain.

Further, the analog modulation module includes: a first analog modulation unit and a second analog modulation unit; the input end of the first analog modulation unit is connected with the output end of the first controllable gain unit, and the input end of the second analog modulation unit is connected with the output end of the second controllable gain unit;

the first analog modulation unit is used for performing analog frequency modulation on the current signal to be modulated to obtain an analog frequency modulation current signal corresponding to the current signal;

the second analog modulation unit is used for performing analog frequency modulation on the voltage signal to be modulated to obtain an analog frequency modulation voltage signal corresponding to the voltage signal.

In a second aspect, an embodiment of the present application further provides an electrical signal detection device, which is in communication connection with three electrical signal acquisition devices, where the three electrical signal acquisition devices are respectively used to acquire preset electrical signals of different phases of a three-phase alternating current to be detected, and include:

the second communication module is used for receiving an analog frequency modulation signal which is sent by the electric signal acquisition device and corresponds to a preset electric signal of a preset phase of the three-phase alternating current to be detected;

the analog demodulation module is connected with the second communication module and is used for performing analog frequency demodulation on the analog frequency modulation signal to obtain an analog demodulation signal corresponding to the preset electric signal;

the second filtering module is connected with the analog demodulation module and is used for filtering the analog demodulation signal;

the controllable attenuation module is connected with the second filtering module and is used for carrying out attenuation processing on the analog demodulation signal after filtering processing based on an attenuation coefficient matched with the analog demodulation signal to obtain a preset electric signal of the preset phase;

and the signal detection module is connected with the controllable attenuation module and used for synthesizing the preset electric signals of different phases at the output end of the controllable attenuation module to obtain a zero sequence synthesized signal of the three-phase alternating current to be detected and detecting the state of the three-phase alternating current to be detected according to the zero sequence synthesized signal.

Further, the preset electrical signal comprises a current signal and a voltage signal; correspondingly, the analog frequency-modulated signal comprises an analog frequency-modulated current signal corresponding to the current signal and an analog frequency-modulated voltage signal corresponding to the voltage signal;

the analog demodulation module includes: a first analog demodulation unit and a second analog demodulation unit; the input end of the first analog demodulation unit is connected with the first output end of the second communication module, and the input end of the second analog demodulation unit is connected with the second output end of the second communication module;

the first analog demodulation unit is used for performing analog frequency demodulation on the analog frequency modulation current signal to obtain an analog demodulation current signal corresponding to the current signal;

the second analog demodulation unit is used for performing analog frequency demodulation on the analog frequency modulation voltage signal to obtain an analog demodulation voltage signal corresponding to the voltage signal.

Further, the controllable attenuation module comprises: the device comprises an attenuation coefficient adjusting unit, a first controllable attenuation unit and a second controllable attenuation unit; a first control end of the attenuation coefficient adjusting unit is connected with a controlled end of the first controllable attenuation unit, a second control end of the attenuation coefficient adjusting unit is connected with a controlled end of the second controllable attenuation unit, an input end of the first controllable attenuation unit is connected with a first output end of the second filtering module, and an input end of the second controllable attenuation unit is connected with a second output end of the second filtering module;

the attenuation coefficient adjusting unit is used for determining a first attenuation coefficient matched with the analog demodulation current signal according to the amplitude of the analog demodulation current signal, adjusting the attenuation coefficient of the first controllable attenuation unit to the first attenuation coefficient, determining a second attenuation coefficient matched with the analog demodulation voltage signal according to the amplitude of the analog demodulation voltage signal, and adjusting the attenuation coefficient of the second controllable attenuation unit to the second attenuation coefficient;

the first controllable attenuation unit is used for carrying out attenuation processing on the analog demodulation current signal after filtering processing according to the first attenuation coefficient to obtain a current signal of the preset phase;

and the second controllable attenuation unit is used for attenuating the analog demodulation voltage signal after filtering processing according to the second attenuation coefficient to obtain the voltage signal of the preset phase.

Further, the signal detection module includes: a current signal synthesizing unit, a current signal judging unit, a voltage signal synthesizing unit and a voltage signal judging unit; the input end of the current signal synthesis unit is connected with the output end of the first controllable attenuation unit, the input end of the current signal judgment unit is connected with the output end of the current signal synthesis unit, the input end of the voltage signal synthesis unit is connected with the output end of the second controllable attenuation unit, and the input end of the voltage signal judgment unit is connected with the output end of the voltage signal synthesis unit;

the current signal synthesis unit is used for synthesizing the current signals of different phases output by the first controllable attenuation unit to obtain a zero sequence current signal of the three-phase alternating current to be detected;

the current signal determination unit is used for detecting whether the current of the three-phase alternating current to be detected is normal or not based on the zero-sequence current signal;

the voltage signal synthesis unit is used for synthesizing the voltage signals of different phases output by the second controllable attenuation unit to obtain a zero-sequence voltage signal of the three-phase alternating current to be detected;

and the voltage signal determination unit is used for detecting whether the voltage of the three-phase alternating current to be detected is normal or not based on the zero sequence voltage signal.

In a third aspect, an embodiment of the present application provides a fault indicator, including the electrical signal detection device according to the second aspect and three electrical signal acquisition devices according to the first aspect.

The electric signal acquisition device provided by the embodiment of the application comprises a signal acquisition module, a first filtering module, a controllable gain module, an analog modulation module and a first communication module which are sequentially connected; the signal acquisition module is used for acquiring a preset electric signal of a preset phase of three-phase alternating current to be detected, the first filtering module is used for filtering the preset electric signal, the controllable gain module is used for processing the preset electric signal after filtering into a to-be-modulated electric signal meeting modulation requirements, the analog modulation module is used for performing analog frequency modulation on the to-be-modulated electric signal to obtain an analog frequency modulation signal, and the first communication module is used for transmitting the analog frequency modulation signal to the electric signal detection device. Because the signal of telecommunication collection system when sending the signal of telecommunication detection device and predetermineeing the signal of telecommunication, adopt the mode of analog modulation will predetermine the signal of telecommunication and modulate into analog modulation signal, and analog modulation signal can not take place to lose the condition of frame or wrong frame in the transmission course usually, thereby make the digital modulation signal that signal of telecommunication detection device received can accurately represent predetermineeing the signal of telecommunication, and then reduce the deviation between the predetermined signal of telecommunication that the demodulation obtained and the predetermined signal of telecommunication that signal of telecommunication collection system gathered, like this, signal of telecommunication detection device is when surveying the three-phase alternating current that awaits measuring based on the predetermined signal of telecommunication after the demodulation, can accurately detect out the state of the three-phase alternating current that awaits measuring, the accuracy of signal of telecommunication detection has been improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a fault indicator provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of an electrical signal acquisition device provided in an embodiment of the present application;

FIG. 3 is a schematic diagram illustrating a three-phase four-wire system for three-phase AC power according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an electrical signal acquisition device provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of an electrical signal detection apparatus provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of an electrical signal detection apparatus provided in an embodiment of the present application;

fig. 7 is a schematic structural diagram of an electrical signal detection apparatus according to another embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It is to be noted that the term "comprises" and any variants thereof in the description and claims of this application are intended to cover non-exclusive inclusions. For example, a system, product or apparatus that comprises a list of elements is not limited to those elements listed, but may alternatively include other elements not listed or inherent to such product or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.

Fig. 1 is a schematic structural diagram of a fault indicator provided in an embodiment of the present application, and as shown in fig. 1, the fault indicator 1 may include three electrical signal acquisition devices 10 and an electrical signal detection device 20 communicably connected to the electrical signal acquisition devices 10. The three electrical signal acquisition devices 10 are respectively used for acquiring preset electrical signals of different phases of the three-phase alternating current to be detected, and the phase of the preset electrical signals acquired by each electrical signal acquisition device 10 can be preset according to actual requirements, namely, each electrical signal acquisition device 10 is used for acquiring the preset electrical signals of the preset phases of the three-phase alternating current to be detected. For example, assuming that three phases of the alternating current corresponding to the three-phase alternating current to be measured are an a phase, a B phase and a C phase, respectively, the three electrical signal acquisition devices 10 may be configured to acquire preset electrical signals of the a phase, the B phase and the C phase of the three-phase alternating current to be measured, respectively. In practical applications, the preset electrical signal may include, but is not limited to, a current signal and a voltage signal.

Each electrical signal acquisition device 10 can send the acquired preset electrical signal of the preset phase to the electrical signal detection device 20; the electrical signal detection device 20 can detect the state of the three-phase alternating current to be detected based on the preset electrical signals of different phases respectively transmitted by the three electrical signal acquisition devices 10.

In practical application, the electrical signal acquisition device 10 and the electrical signal detection device 20 may be connected in wireless communication or wired communication, specifically set according to actual requirements, and are not limited this time.

Referring to fig. 2, fig. 2 is a schematic structural diagram of an electrical signal acquisition device according to an embodiment of the present application, and for convenience of description, only a portion related to the embodiment of the present application is shown. As shown in fig. 2, an electrical signal acquisition device 10 provided in the embodiment of the present application may be communicatively connected to an electrical signal detection device 20. The electrical signal acquisition device 10 may specifically include:

and the signal acquisition module 11 is used for acquiring a preset electric signal of a preset phase of the three-phase alternating current to be detected.

And the first filtering module 12 is connected with the signal acquisition module 11 and is used for filtering the preset electric signal.

And the controllable gain module 13 is connected to the first filtering module 12 and configured to process the filtered preset electrical signal into an electrical signal to be modulated according to modulation requirements based on a gain matched with the preset electrical signal.

And the analog modulation module 14 is connected with the controllable gain module 13 and is configured to perform analog frequency modulation on the electrical signal to be modulated to obtain an analog frequency modulation signal corresponding to the preset electrical signal.

And the first communication module 15 is connected with the analog modulation module 14 and is used for sending the analog frequency modulation signal to the electric signal detection device.

In practical applications, three-phase alternating current is usually generated by three symmetrical windings of a three-phase generator, each winding together with its external circuit is called a phase, which can be referred to as a phase a, B and C, respectively. Three-phase ac access circuit connections typically include three-phase three-wire connections and three-phase four-wire connections.

In this embodiment of the application, the three-phase alternating current that awaits measuring can be the three-phase alternating current that the three-phase generator that awaits measuring produced. In this embodiment, a connection method of a three-phase ac power-in circuit to be detected is taken as an example of a three-phase four-wire connection method, and an electrical signal acquisition and electrical signal detection process of the three-phase ac power to be detected is exemplarily described. As shown in fig. 3, assuming that the three windings of the three-phase generator are 31, 32, and 33, respectively, when the three-phase four-wire system is used to connect the three windings into the circuit, the ends X, Y, Z of the three

windings

31, 32, and 33 are generally connected together as a zero point O, and one power line is respectively drawn from the zero point O and the head ends A, B and C of the three

windings

31, 32, and 33, the power line drawn from the zero point O is generally called a zero line, the power lines drawn from the head ends A, B and C of the three

windings

31, 32, and 33 are generally called a-phase line, B-phase line, and C-phase line, and the a-phase line, B-phase line, and C-phase line are generally called a live.

In this embodiment, the signal acquisition module 11 may be connected to the phase line corresponding to the default of the three-phase ac power to be measured, so as to acquire the electrical signal of the default phase of the ac power to be measured. For example, assuming that the electrical signal acquisition device 10 acquires a preset electrical signal of the a phase of the three-phase alternating current to be detected, the signal acquisition module 11 in the electrical signal acquisition device 10 may be connected to the a phase of the three-phase alternating current to be detected.

In the embodiment of the present application, the gain specifically refers to an amplification factor. Because the amplitude of the electrical signal is usually required to be within the preset amplitude range when the electrical signal is subjected to analog modulation, the controllable gain module 13 may determine the gain matched with the preset electrical signal according to the amplitude of the preset electrical signal, so that the amplitude of the electrical signal to be modulated, which is obtained by processing the filtered preset electrical signal based on the gain matched with the preset electrical signal, is within the preset amplitude range, thereby making the electrical signal to be modulated meet the preset modulation requirement. The preset amplitude range may be set according to actual requirements, and is not limited herein.

Specifically, the controllable gain module 13 processes the filtered preset electrical signal based on a gain matched with the preset electrical signal, and may include: and based on the gain matched with the preset electric signal, amplifying the amplitude of the filtered preset electric signal to obtain the electric signal to be modulated.

In this embodiment, by controlling the amplitude of the electrical signal to be modulated within the preset amplitude range, the signal-to-noise ratio of the electrical signal to be modulated can be improved, so as to improve the transmission energy of the subsequently modulated analog frequency modulation signal.

In practical applications, the analog modulation generally includes amplitude modulation, frequency modulation, and phase modulation, and since the frequency modulation has the best anti-interference performance, the analog modulation module 14 in the embodiment of the present application may perform analog frequency modulation on the electrical signal to be modulated to obtain an analog frequency modulated signal corresponding to the preset electrical signal.

In this embodiment of the application, the first communication module 15 may be a wireless communication module or a wired communication module, and is specifically set according to actual requirements, which is not limited here.

As can be seen from the above, the electrical signal acquisition device provided in the embodiment of the present application includes a signal acquisition module, a first filtering module, a controllable gain module, an analog modulation module, and a first communication module, which are connected in sequence; the signal acquisition module is used for acquiring a preset electric signal of a preset phase of three-phase alternating current to be detected, the first filtering module is used for filtering the preset electric signal, the controllable gain module is used for processing the preset electric signal after filtering into a to-be-modulated electric signal meeting modulation requirements, the analog modulation module is used for performing analog frequency modulation on the to-be-modulated electric signal to obtain an analog frequency modulation signal, and the first communication module is used for transmitting the analog frequency modulation signal to the electric signal detection device. Because the signal of telecommunication collection system when sending the signal of telecommunication detection device and predetermineeing the signal of telecommunication, adopt the mode of analog modulation will predetermine the signal of telecommunication and modulate into analog modulation signal, and analog modulation signal can not take place to lose the condition of frame or wrong frame in the transmission course usually, thereby make the digital modulation signal that signal of telecommunication detection device received can accurately represent predetermineeing the signal of telecommunication, and then reduce the deviation between the predetermined signal of telecommunication that the demodulation obtained and the predetermined signal of telecommunication that signal of telecommunication collection system gathered, like this, signal of telecommunication detection device is when surveying the three-phase alternating current that awaits measuring based on the predetermined signal of telecommunication after the demodulation, can accurately detect out the state of the three-phase alternating current that awaits measuring, the accuracy of signal of telecommunication detection has been improved.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an electrical signal acquisition device according to an embodiment of the present application, and for convenience of description, only a portion related to the embodiment of the present application is shown. As shown in fig. 4, since the preset electrical signal may include a current signal and a voltage signal, based on this, the signal acquisition module 11 in this embodiment may include: a current signal collection unit 111 and a voltage signal collection unit 112. Wherein:

the current signal collecting unit 111 is used for collecting a current signal of a preset phase of the three-phase alternating current to be measured.

The voltage signal collecting unit 112 is configured to collect a voltage signal of a preset phase of the three-phase ac power to be detected.

In this embodiment, the input end of the current signal collecting unit 111 may be connected to a phase line corresponding to the preset three-phase alternating current to be detected; a first input end of the voltage signal acquisition unit 112 may be connected to a phase line corresponding to the preset three-phase alternating current to be measured, and a second input end of the voltage signal acquisition unit 112 may be connected to a zero line.

For example, referring to fig. 3, assuming that the electrical signal collecting device 10 collects a preset electrical signal of the a phase of the three-phase alternating current to be measured, the current signal collecting unit 111 is configured to collect a current signal of the a phase of the three-phase alternating current to be measured, and the voltage signal collecting unit 112 is configured to collect a voltage signal of the a phase of the three-phase alternating current to be measured. Then, the input end of the current signal collecting unit 111 may be connected to the a-phase line of the three-phase alternating current to be detected; a first input end of the voltage signal acquisition unit 112 may be connected to an a-phase line of the three-phase alternating current to be measured, and a second input end of the voltage signal acquisition unit 112 may be connected to a zero line.

In practical applications, the current signal collecting unit 111 may be specifically a current meter, and the voltage signal collecting unit 112 may be specifically a voltage meter.

In an embodiment of the present application, the first filtering module 12 may include: a first signal filtering unit 121 and a second signal filtering unit 122. The input end of the first signal filtering unit 121 is connected to the output end of the current signal acquiring unit 111, and the input end of the second signal filtering unit 122 is connected to the output end of the voltage signal acquiring unit 112.

The first signal filtering unit 121 is configured to perform filtering processing on the current signal.

The second signal filtering unit 122 is configured to perform filtering processing on the voltage signal.

In this embodiment, after receiving the current signal sent by the current signal collecting unit 111, the first signal filtering unit 121 performs filtering processing on the current signal; the second signal filtering unit 122 performs filtering processing on the voltage signal after receiving the voltage signal sent by the voltage signal collecting unit 112.

In practical applications, the first signal filtering unit 121 and the second signal filtering unit 122 may each employ a conventional filtering circuit, such as an LC filtering circuit.

The embodiment can effectively filter high-frequency noise in the current signal and the voltage signal by filtering the collected current signal and the collected voltage signal.

In an embodiment of the present application, the controllable gain module 13 may include: a gain adjustment unit 131, a first controllable gain unit 132 and a second controllable gain unit 133. A first control end of the gain adjusting unit 131 is connected to a controlled end of the first controllable gain unit 132, a second control end of the gain adjusting unit 131 is connected to a controlled end of the second controllable gain unit 133, an input end of the first controllable gain unit 132 is connected to an output end of the first signal filtering unit 121, and an input end of the second controllable gain unit 133 is connected to an output end of the second signal filtering unit 122.

The gain adjustment unit 131 is configured to determine a first gain matched to the current signal according to the amplitude of the current signal and adjust the gain of the first controllable gain unit 132 to the first gain, and determine a second gain matched to the voltage signal according to the amplitude of the voltage signal and adjust the gain of the second controllable gain unit 133 to the second gain.

The first controllable gain unit 132 is configured to process the current signal into a current signal to be modulated according to a first gain.

The second controllable gain unit 133 is configured to process the voltage signal into a voltage signal to be modulated according to a second gain.

In this embodiment, the gain adjusting unit 131 may determine a first gain matched with the current signal according to the amplitude of the current signal, so that the amplitude of the current signal to be modulated, which is obtained by processing the filtered current signal based on the first gain, is within a preset amplitude range, and thus the current signal to be modulated meets a preset modulation requirement. Specifically, after the gain adjustment unit 131 adjusts the gain of the first controllable gain unit 132 to be the first gain, the first controllable gain unit 132 may amplify the amplitude of the filtered current signal sent by the first signal filtering unit 121 according to the first gain, so as to obtain the current signal to be modulated.

The gain adjusting unit 131 may further determine a second gain matched with the voltage signal according to the amplitude of the voltage signal, so that the amplitude of the voltage signal to be modulated, which is obtained by processing the filtered voltage signal based on the second gain, is within a preset amplitude range, and thus the voltage signal to be modulated meets a preset modulation requirement. Specifically, after the gain of the second controllable gain unit 133 is adjusted to the second gain by the gain adjusting unit 131, the second controllable gain unit 133 may amplify the amplitude of the filtered voltage signal sent by the second signal filtering unit 122 according to the second gain, so as to obtain the voltage signal to be modulated.

In practical applications, the first controllable gain unit 132 and the second controllable gain unit 133 may be operational amplifiers.

In this embodiment, by controlling the amplitudes of the current signal to be modulated and the voltage signal to be modulated within the preset amplitude range, the signal-to-noise ratio of the current signal to be modulated and the voltage signal to be modulated can be improved, so as to improve the transmission energy of the subsequently modulated analog frequency modulation current signal and the subsequently modulated analog frequency modulation voltage signal.

In an embodiment of the present application, the analog modulation module 14 may include: a first analog modulation unit 141 and a second analog modulation unit 142. Wherein an input terminal of the first analog modulation unit 141 is connected to an output terminal of the first controllable gain unit 132, and an input terminal of the second analog modulation unit 142 is connected to an output terminal of the second controllable gain unit 133.

The first analog modulation unit 141 is configured to perform analog frequency modulation on a current signal to be modulated to obtain an analog frequency-modulated current signal corresponding to the current signal.

The second analog modulation unit 142 is configured to perform analog frequency modulation on the voltage signal to be modulated to obtain an analog frequency-modulated voltage signal corresponding to the voltage signal.

In practical applications, the first analog modulation unit 141 and the second analog modulation unit 142 may each include an analog frequency modulation chip. The model of the analog frequency modulation chip can be determined according to actual requirements.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an electrical signal detection apparatus according to an embodiment of the present application, and for convenience of description, only a portion related to the embodiment of the present application is shown. As shown in fig. 5, an electrical signal detection device 20 provided in this embodiment of the present application may be simultaneously in communication connection with three electrical signal acquisition devices 10, where the three electrical signal acquisition devices 10 are respectively used to acquire preset electrical signals of different phases of a three-phase alternating current to be detected. By way of example and not limitation, the three electrical signal collection devices 10 may be respectively used to collect preset electrical signals of a phase, B phase and C phase of the three-phase alternating current to be measured.

The electrical signal detection device 20 provided in this embodiment specifically includes:

and the second communication module 21 is configured to receive an analog frequency modulation signal corresponding to a preset electric signal of a preset phase of the three-phase alternating current to be detected, which is sent by the electric signal acquisition device.

And the analog demodulation module 22 is connected to the second communication module 21 and configured to perform analog frequency demodulation on the analog frequency modulation signal to obtain an analog demodulation signal corresponding to the preset electrical signal.

And the second filtering module 23 is connected to the analog demodulating module 22 and configured to perform filtering processing on the analog demodulated signal.

And the controllable attenuation module 24 is connected to the second filtering module 23, and is configured to perform attenuation processing on the filtered analog demodulation signal based on an attenuation coefficient matched with the analog demodulation signal, so as to obtain a preset electrical signal of the preset phase.

And the signal detection module 25 is connected with the controllable attenuation module 24 and is used for synthesizing the preset electric signals of different phases at the output end of the controllable attenuation module to obtain a zero sequence synthesized signal of the three-phase alternating current to be detected and detecting the state of the three-phase alternating current to be detected according to the zero sequence synthesized signal.

In this embodiment of the application, the second communication module 21 may be a wireless communication module or a wired communication module, and is specifically set according to actual requirements, which is not limited here.

In the embodiment of the present application, the attenuation coefficient specifically refers to a reduction factor. Since the analog frequency modulation signal received by the second communication module 21 is obtained by amplifying the amplitude of the preset electrical signal of the preset phase, the controllable attenuation module 24 needs to reduce the amplitude of the filtered analog demodulation signal to restore the analog demodulation signal to the preset electrical signal of the preset phase. In practical applications, the controllable attenuation module 24 may determine an attenuation coefficient matching an analog demodulation signal corresponding to a preset electrical signal according to a gain of the preset electrical signal of the preset phase during analog frequency modulation. Specifically, the controllable attenuation module 24 may determine the inverse of the gain of the preset electrical signal of the preset phase during the analog frequency modulation as the attenuation coefficient matched with the analog demodulation signal corresponding to the preset electrical signal.

Specifically, the controllable attenuation module 24 may perform attenuation processing on the filtered analog demodulation signal based on an attenuation coefficient matched with the analog demodulation signal, including: and based on the attenuation coefficient matched with the analog demodulation signal, carrying out reduction processing on the amplitude of the analog demodulation signal after filtering processing to obtain a preset electric signal of a preset phase.

In this embodiment of the application, if the signal detection module 25 detects that the zero sequence synthesized signal of the three-phase alternating current to be detected is zero, it is determined that the preset electric signal of the three-phase alternating current to be detected is normal, and if the zero sequence synthesized signal of the three-phase alternating current to be detected is not zero, it is determined that the preset electric signal of the three-phase alternating current to be detected is abnormal.

In practical application, when the signal detection module 25 detects that the preset electric signal of the three-phase alternating current to be detected is abnormal, fault prompt can be performed.

As can be seen from the above, the electrical signal detection device provided in the embodiment of the present application includes a second communication module, an analog demodulation module, a second filtering module, a controllable attenuation module, and a signal detection module, which are connected in sequence; receiving an analog frequency modulation signal corresponding to a preset electric signal of a preset phase of the three-phase alternating current to be detected, which is sent by the three electric signal acquisition devices, through a second communication module; performing analog frequency demodulation on the analog frequency modulation signal through an analog demodulation module to obtain an analog demodulation signal corresponding to a preset electric signal; filtering the analog demodulation signal through a second filtering module; attenuating the filtered analog demodulation signal through a controllable attenuation module to obtain a preset electric signal of a preset phase; and synthesizing the preset electric signals of different phases at the output end of the controllable attenuation module through the signal detection module to obtain a zero sequence synthesized signal of the three-phase alternating current to be detected, and detecting the state of the three-phase alternating current to be detected according to the zero sequence synthesized signal. Because the electric signal detection device receives the analog frequency modulation signals corresponding to the preset electric signals of different phases, and the analog frequency modulation signals can not generate frame error or frame loss generally in the transmission process, the analog frequency modulation signals received by the electric signal detection device can accurately represent the preset electric signals of different phases, so that the deviation between the preset electric signals obtained by demodulation and the preset electric signals acquired by the electric signal acquisition device is reduced, and thus, when the electric signal detection device detects the three-phase alternating current to be detected based on the demodulated preset electric signals of different phases, the state of the three-phase alternating current to be detected can be accurately detected, and the accuracy of electric signal detection is improved.

Fig. 6 is a schematic structural diagram of an electrical signal detection device provided in an embodiment of the present application, and only a part related to the embodiment of the present application is shown for convenience of description. As shown in fig. 6, as an embodiment of the present application, the second communication module 21 may include a first communication unit 211, a second communication unit 212, and a third communication unit 213. The first communication unit 211, the second communication unit 212, and the third communication unit 213 are respectively configured to receive analog fm signals sent by different electrical signal collection devices 10. Since the phases of the analog fm signals sent by different electrical signal collection devices 10 are different, for example, 3 different electrical signal collection devices 10 may be respectively used to send the analog fm signals corresponding to the preset electrical signals of the a phase, the B phase, and the C phase of the three-phase ac power to be detected, and therefore, the first communication unit 211, the second communication unit 212, and the third communication unit 213 are respectively used to receive the analog fm signals corresponding to the preset electrical signals of different phases of the three-phase ac power to be detected.

In practical applications, the first communication unit 211, the second communication unit 212, and the third communication unit 213 may be wireless communication units or wired communication units, and are specifically set according to practical requirements, and are not limited herein. Specifically, when the first communication unit 211, the second communication unit 212, and the third communication unit 213 are all wireless communication units, each of the first communication unit 211, the second communication unit 212, and the third communication unit 213 may include an antenna, and the signal receiving frequencies of the three antennas are respectively the same as the frequencies of the analog fm signals sent by the three electrical signal acquisition devices 10.

In an embodiment of the present application, since the preset electrical signal includes a current signal and a voltage signal, the analog demodulation module 22 in this embodiment may include: a first analog demodulation unit 221 and a second analog demodulation unit 222. The input end of the first analog demodulating unit 221 is connected to the first output end of the second communication module 21, and the input end of the second analog demodulating unit 222 is connected to the second output end of the second communication module 21. Specifically, a first input end of the first analog demodulation unit 221 is connected to a first output end of the first communication unit 211, a second input end of the first analog demodulation unit 221 is connected to a first output end of the second communication unit 212, and a third input end of the first analog demodulation unit 221 is connected to a first output end of the third communication unit 213; a first input of the second analog demodulation unit 222 is connected to the second output of the first communication unit 211, a second input of the second analog demodulation unit 222 is connected to the second output of the second communication unit 212, and a third input of the second analog demodulation unit 222 is connected to the second output of the third communication unit 213.

The first analog demodulation unit 221 is configured to perform analog frequency demodulation on the analog frequency-modulated current signal to obtain an analog demodulated current signal corresponding to the current signal.

The second analog demodulation unit 222 is configured to perform analog frequency demodulation on the analog frequency-modulated voltage signal to obtain an analog demodulated voltage signal corresponding to the voltage signal.

As an embodiment of the present application, the second filtering module 23 may include a third signal filtering unit 231 and a fourth signal filtering unit 232. The input terminal of the third signal filtering unit 231 is connected to the output terminal of the first analog demodulating unit 221, and the input terminal of the fourth signal filtering unit 232 is connected to the output terminal of the second analog demodulating unit 222.

The third signal filtering unit 231 is configured to perform filtering processing on the analog demodulation current signal.

The fourth signal filtering unit 232 is configured to perform filtering processing on the analog demodulation voltage signal.

In the embodiment, the analog demodulation current signal and the analog demodulation voltage signal are subjected to filtering processing, so that high-frequency noise in the analog demodulation current signal and the analog demodulation voltage signal can be effectively filtered.

In an embodiment of the present application, the controllable attenuation module 24 may include: an attenuation coefficient adjusting unit 241, a first controllable attenuation unit 242, and a second controllable attenuation unit 243. A first control end of the attenuation coefficient adjusting unit 241 is connected to a controlled end of the first controllable attenuation unit 242, a second control end of the attenuation coefficient adjusting unit 241 is connected to a controlled end of the second controllable attenuation unit 243, an input end of the first controllable attenuation unit 242 is connected to an output end of the third signal filtering unit 231, and an input end of the second controllable attenuation unit 243 is connected to an output end of the fourth signal filtering unit 232.

The attenuation coefficient adjusting unit 241 is configured to determine a first attenuation coefficient matching the analog demodulation current signal according to the amplitude of the analog demodulation current signal, adjust the attenuation coefficient of the first controllable attenuation unit to the first attenuation coefficient, determine a second attenuation coefficient matching the analog demodulation voltage signal according to the amplitude of the analog demodulation voltage signal, and adjust the attenuation coefficient of the second controllable attenuation unit to the second attenuation coefficient.

The first controllable attenuation unit 242 is configured to perform attenuation processing on the filtered analog demodulation current signal according to the first attenuation coefficient, so as to obtain the current signal of the preset phase.

The second controllable attenuation unit 243 is configured to perform attenuation processing on the filtered analog demodulation voltage signal according to the second attenuation coefficient, so as to obtain the voltage signal of the preset phase.

In this embodiment, the attenuation coefficient adjusting unit 241 may determine the first attenuation coefficient matched with the analog demodulation current signal corresponding to the current signal of the preset phase according to the gain of the current electrical signal of the preset phase during the analog frequency modulation. Specifically, the attenuation coefficient adjusting unit 241 may determine the inverse of the gain of the current electrical signal of the preset phase when performing analog frequency modulation, as the first attenuation coefficient matched with the analog demodulation current signal corresponding to the current signal of the preset phase.

In this embodiment, the first controllable attenuation unit 242 may perform reduction processing on the amplitude of the analog demodulation current signal corresponding to the filtered preset-phase current signal based on the first attenuation coefficient to obtain the preset-phase current signal.

The attenuation coefficient adjusting unit 241 may further determine a second attenuation coefficient that matches the analog demodulation voltage signal corresponding to the voltage signal of the preset phase according to a gain of the voltage electrical signal of the preset phase during the analog frequency modulation. Specifically, the attenuation coefficient adjusting unit 241 may determine the inverse of the gain of the voltage electrical signal of the preset phase when performing analog frequency modulation, as the second attenuation coefficient matched with the analog demodulation voltage signal corresponding to the voltage electrical signal of the preset phase.

In this embodiment, the second controllable attenuation unit 243 may perform reduction processing on the amplitude of the analog demodulation voltage signal corresponding to the filtered preset-phase voltage signal based on the second attenuation coefficient to obtain the preset-phase voltage signal.

In an embodiment of the present application, the signal detection module 25 may include: current signal synthesizing section 251, current signal determining section 252, voltage signal synthesizing section 253, and voltage signal determining section 254. The input end of the current signal synthesizing unit 251 is connected to the output end of the first controllable attenuation unit 241, the input end of the current signal determining unit 252 is connected to the output end of the current signal synthesizing unit 251, the input end of the voltage signal synthesizing unit 253 is connected to the output end of the second controllable attenuation unit 242, and the input end of the voltage signal determining unit 254 is connected to the output end of the voltage signal synthesizing unit 253.

The current signal synthesizing unit 251 is configured to synthesize the current signals of different phases output by the first controllable attenuation unit to obtain a zero-sequence current signal of the three-phase alternating current to be detected.

The current signal determination unit 252 is configured to detect whether the current of the three-phase alternating current to be detected is normal based on the zero-sequence current signal.

The voltage signal synthesizing unit 253 is configured to synthesize the voltage signals of different phases output by the second controllable attenuation unit to obtain a zero-sequence voltage signal of the three-phase alternating current to be detected.

The voltage signal determination unit 254 is configured to detect whether the voltage of the three-phase alternating current to be detected is normal based on the zero-sequence voltage signal.

In this embodiment, the current signal determining unit 252 determines that the current signal of the three-phase alternating current to be detected is normal if it detects that the zero-sequence current signal of the three-phase alternating current to be detected is zero, and determines that the current signal of the three-phase alternating current to be detected is abnormal if it detects that the zero-sequence current signal of the three-phase alternating current to be detected is not zero; the voltage signal determination unit 253 determines that the voltage signal of the three-phase alternating current to be measured is normal if detecting that the zero-sequence voltage signal of the three-phase alternating current to be measured is zero, and determines that the voltage signal of the three-phase alternating current to be measured is abnormal if detecting that the zero-sequence voltage signal of the three-phase alternating current to be measured is not zero.

In the embodiment of the application, the same circuit is adopted in the processes of acquisition, filtering, modulation, transmission, demodulation, zero sequence synthesis and the like of the three-phase preset electric signal of the three-phase alternating current to be detected, so that the phase synchronization precision between the three-phase preset electric signals can be improved, and the accuracy of electric signal detection is improved.

Fig. 7 is a schematic structural diagram of an electrical signal detection apparatus according to another embodiment of the present application, and only a portion related to the embodiment of the present application is shown for convenience of description. As shown in fig. 7, as an embodiment of the present application, since the current signal of the three-phase ac to be measured generally includes three phases, i.e., a phase, B phase and C phase, in this embodiment, the first analog demodulation unit 221 may include a first analog demodulation subunit 2211, a second analog demodulation subunit 2212 and a third analog demodulation subunit 2213. An input terminal of the first analog demodulation subunit 2211 is connected to a first output terminal of the first communication unit 211, an input terminal of the second analog demodulation subunit 2212 is connected to a first output terminal of the second communication unit 212, and an input terminal of the third analog demodulation subunit 2213 is connected to a first output terminal of the third communication unit 213.

In this embodiment, the first analog demodulation subunit 2211 is configured to perform analog frequency demodulation on an analog frequency-modulated current signal corresponding to the current signal of the preset phase sent by the first communication unit 211, so as to obtain an analog demodulated current signal corresponding to the current signal of the preset phase; the second analog demodulation subunit 2212 is configured to perform analog frequency demodulation on the analog frequency-modulated current signal corresponding to the preset-phase current signal sent by the second communication unit 212, so as to obtain an analog demodulated current signal corresponding to the preset-phase current signal; the third analog demodulation sub-unit 2213 is configured to perform analog frequency demodulation on the analog frequency-modulated current signal corresponding to the preset-phase current signal sent by the third communication unit 213, so as to obtain an analog demodulated current signal corresponding to the preset-phase current signal.

In an embodiment of the present invention, since the voltage signal of the three-phase ac power to be measured generally includes three phases, i.e., a phase a, a phase B, and a phase C, in this embodiment, the second analog demodulating unit 221 may include a fourth analog demodulating sub-unit 2221, a fifth analog demodulating sub-unit 2222, and a sixth analog demodulating sub-unit 2223. An input end of the fourth analog demodulation subunit 2221 is connected to the second output end of the first communication unit 211, an input end of the fifth analog demodulation subunit 2222 is connected to the second output end of the second communication unit 212, and an input end of the sixth analog demodulation subunit 2223 is connected to the second output end of the third communication unit 213.

In this embodiment, the fourth analog demodulation subunit 2221 is configured to perform analog frequency demodulation on the analog frequency modulation voltage signal corresponding to the voltage signal of the preset phase sent by the first communication unit 211, so as to obtain an analog demodulation voltage signal corresponding to the voltage signal of the preset phase; the fifth analog demodulating subunit 2222 is configured to perform analog frequency demodulation on the analog frequency-modulated voltage signal corresponding to the voltage signal of the preset phase sent by the second communication unit 212, so as to obtain an analog demodulated voltage signal corresponding to the voltage signal of the preset phase; the sixth analog demodulating sub-unit 2223 is configured to perform analog frequency demodulation on the analog frequency-modulated voltage signal corresponding to the voltage signal of the preset phase sent by the third communication unit 213, so as to obtain an analog demodulated voltage signal corresponding to the voltage signal of the preset phase.

In practical applications, the first analog demodulation sub-unit 2211, the second analog demodulation sub-unit 2212, the third analog demodulation sub-unit 2213, the fourth analog demodulation sub-unit 2221, the fifth analog demodulation sub-unit 2222, and the sixth analog demodulation sub-unit 2223 may all include analog fm chips. The model of the analog frequency modulation chip can be determined according to actual requirements.

In an embodiment of the present application, the third signal filtering unit 231 may include a first signal filtering sub-unit 2311, a second signal filtering sub-unit 2312 and a third signal filtering sub-unit 2313. The input end of the first signal filtering subunit 2311 is connected to the output end of the first analog demodulating subunit 2211, the input end of the second signal filtering subunit 2312 is connected to the output end of the second analog demodulating subunit 2212, and the input end of the third signal filtering subunit 2313 is connected to the output end of the third analog demodulating subunit 2213.

In this embodiment, the first signal filtering subunit 2311 is configured to perform filtering processing on an analog demodulation current signal corresponding to the current signal of the preset phase sent by the first analog demodulation subunit 2211; the second signal filtering subunit 2312 is configured to perform filtering processing on the analog demodulation current signal corresponding to the preset-phase current signal sent by the second analog demodulation subunit 2212; the third signal filtering subunit 2313 is configured to perform filtering processing on the analog demodulation current signal corresponding to the current signal of the preset phase sent by the third analog demodulation subunit 2213.

In an embodiment of the present application, the fourth signal filtering unit 232 may include a fourth signal filtering subunit 2321, a fifth signal filtering subunit 2322, and a sixth signal filtering subunit 2323. An input end of the fourth signal filtering subunit 2321 is connected to an output end of the fourth analog demodulation subunit 2221, an input end of the fifth signal filtering subunit 2322 is connected to an output end of the fifth analog demodulation subunit 2222, and an input end of the sixth signal filtering subunit 2323 is connected to an output end of the sixth analog demodulation subunit 2223.

In this embodiment, the fourth signal filtering subunit 2321 is configured to perform filtering processing on the analog demodulation voltage signal corresponding to the voltage signal of the preset phase sent by the fourth analog demodulation subunit 2221; the fifth signal filtering subunit 2322 is configured to perform filtering processing on the analog demodulation voltage signal corresponding to the voltage signal of the preset phase sent by the fifth analog demodulation subunit 2222; the sixth signal filtering subunit 2323 is configured to perform filtering processing on the analog demodulation voltage signal corresponding to the voltage signal of the preset phase sent by the sixth analog demodulation subunit 2223.

In practical applications, the first signal filtering sub-unit 2311, the second signal filtering sub-unit 2312, the third signal filtering sub-unit 2313, the fourth signal filtering sub-unit 2321, the fifth signal filtering sub-unit 2322 and the sixth signal filtering sub-unit 2323 may all adopt a conventional filtering circuit, such as an LC filtering circuit.

In one embodiment of the present application, the first controllable attenuation unit 242 may include a first controllable attenuation subunit 2421, a second controllable attenuation subunit 2422, and a third controllable attenuation subunit 2413. The input end of the first controllable attenuation subunit 2421 is connected to the output end of the first signal filtering subunit 2311, the input end of the second controllable attenuation subunit 2422 is connected to the output end of the second signal filtering subunit 2312, the input end of the third controllable attenuation subunit 2423 is connected to the output end of the third signal filtering subunit 2313, the first control end of the attenuation coefficient adjusting unit 241 is connected to the controlled end of the first controllable attenuation subunit 2421, the second control end of the attenuation coefficient adjusting unit 241 is connected to the controlled end of the second controllable attenuation subunit 2422, and the third control end of the attenuation coefficient adjusting unit 241 is connected to the controlled end of the third controllable attenuation subunit 2423.

In this embodiment, the attenuation coefficient adjusting unit 241 may determine a first attenuation coefficient matched with the analog demodulation current signal corresponding to the current signal of each phase according to the amplitudes of the analog demodulation current signals corresponding to the current signals of different phases respectively sent by the first signal filtering subunit 2311, the second signal filtering subunit 2312 and the third signal filtering subunit 2313, and respectively adjust the attenuation coefficients of the first controllable attenuation subunit 2421, the second controllable attenuation subunit 2422 and the third controllable attenuation subunit 2423 to the first attenuation coefficient corresponding to the current signal of the corresponding phase.

In this embodiment, the first controllable attenuation subunit 2421, the second controllable attenuation subunit 2422, and the third controllable attenuation subunit 2423 are respectively configured to perform attenuation processing on the filtered analog demodulation current signal of the corresponding phase based on the corresponding first attenuation coefficient, so as to obtain a current signal of the corresponding phase. For example, assuming that the first signal filtering subunit 2311 receives an analog demodulated current signal corresponding to an a-phase current signal of three-phase alternating current to be detected, the first controllable attenuation subunit 2421 is configured to perform attenuation processing on the analog demodulated current signal corresponding to the a-phase current signal after filtering processing by the first signal filtering subunit 2311 according to a first attenuation coefficient matched with the analog demodulated current signal corresponding to the a-phase current signal, so as to obtain an a-phase current signal; assuming that the second signal filtering subunit 2312 receives an analog demodulation current signal corresponding to a B-phase current signal of the three-phase alternating current to be detected, the second controllable attenuation subunit 2422 is configured to perform attenuation processing on the analog demodulation current signal corresponding to the B-phase current signal filtered by the second signal filtering subunit 2312 according to a first attenuation coefficient matched with the analog demodulation current signal corresponding to the B-phase current signal, so as to obtain a B-phase current signal; assuming that the third signal filtering subunit 2313 receives the analog demodulation current signal corresponding to the C-phase current signal of the three-phase alternating current to be detected, the third controllable attenuation subunit 2423 is configured to perform attenuation processing on the analog demodulation current signal corresponding to the C-phase current signal filtered by the third signal filtering subunit 2313 according to a first attenuation coefficient matched with the analog demodulation current signal corresponding to the C-phase current signal, so as to obtain the C-phase current signal.

In an embodiment of the present application, the second controllable attenuation unit 243 may include a fourth controllable attenuation subunit 2431, a fifth controllable attenuation subunit 2432 and a sixth controllable attenuation subunit 2433. An input end of the fourth controllable attenuation subunit 2431 is connected to an output end of the fourth signal filtering subunit 2321, an input end of the fifth controllable attenuation subunit 2432 is connected to an output end of the fifth signal filtering subunit 2322, an input end of the sixth controllable attenuation subunit 2433 is connected to an output end of the sixth signal filtering subunit 2323, a fourth control end of the attenuation coefficient adjusting unit 241 is connected to a controlled end of the fourth controllable attenuation subunit 2431, a fifth control end of the attenuation coefficient adjusting unit 241 is connected to a controlled end of the fifth controllable attenuation subunit 2432, and a sixth control end of the attenuation coefficient adjusting unit 241 is connected to a controlled end of the sixth controllable attenuation subunit 2433

In this embodiment, the attenuation coefficient adjusting unit 241 may determine a second attenuation coefficient matched with the analog demodulation voltage signal corresponding to the voltage signal of each phase according to the amplitudes of the analog demodulation voltage signals corresponding to the voltage signals of different phases respectively sent by the fourth signal filtering subunit 2321, the fifth signal filtering subunit 2322 and the sixth signal filtering subunit 2323, and adjust the attenuation coefficients of the fourth controllable attenuation subunit 2431, the fifth controllable attenuation subunit 2432 and the sixth controllable attenuation subunit 2433 to the second attenuation coefficient corresponding to the voltage signal of the corresponding phase respectively.

In this embodiment, the fourth controllable attenuation subunit 2431, the fifth controllable attenuation subunit 2432, and the sixth controllable attenuation subunit 2433 are respectively configured to perform attenuation processing on the filtered analog demodulation voltage signal of the corresponding phase based on the corresponding second attenuation coefficient, so as to obtain a voltage signal of the corresponding phase. For example, assuming that the fourth signal filtering subunit 2321 receives the analog demodulation voltage signal corresponding to the a-phase voltage signal of the three-phase alternating current to be detected, the fourth controllable attenuation subunit 2431 is configured to perform attenuation processing on the analog demodulation voltage signal corresponding to the a-phase voltage signal filtered by the fourth signal filtering subunit 2321 according to a second attenuation coefficient matched with the analog demodulation voltage signal corresponding to the a-phase voltage signal, so as to obtain the a-phase voltage signal; assuming that the analog demodulation voltage signal corresponding to the B-phase voltage signal of the three-phase alternating current to be detected is received by the fifth signal filtering subunit 2322, the fifth controllable attenuation subunit 2432 is configured to perform attenuation processing on the analog demodulation voltage signal corresponding to the B-phase voltage signal filtered by the fifth signal filtering subunit 2322 according to a second attenuation coefficient matched with the analog demodulation voltage signal corresponding to the B-phase voltage signal, so as to obtain a B-phase voltage signal; assuming that the analog demodulation voltage signal corresponding to the C-phase voltage signal of the three-phase alternating current to be detected is received by the sixth signal filtering subunit 2323, the sixth controllable attenuation subunit 2433 is configured to perform attenuation processing on the analog demodulation voltage signal corresponding to the C-phase voltage signal after filtering processing by the sixth signal filtering subunit 2323 according to a second attenuation coefficient matched with the analog demodulation voltage signal corresponding to the C-phase voltage signal, so as to obtain the C-phase voltage signal.

In practical applications, the first controllable attenuation subunit 2421, the second controllable attenuation subunit 2422, the third controllable attenuation subunit 2423, the fourth controllable attenuation subunit 2431, the fifth controllable attenuation subunit 2432 and the sixth controllable attenuation subunit 2433 may all be operational amplifiers.

In the present embodiment, a first input terminal of the current signal synthesizing unit 251 is connected to an output terminal of the first controllable attenuation subunit 2421, a second input terminal of the current signal synthesizing unit 251 is connected to an output terminal of the second controllable attenuation subunit 2422, a third input terminal of the current signal synthesizing unit 251 is connected to an output terminal of the third controllable attenuation subunit 2423, an input terminal of the current signal determining unit 252 is connected to an output terminal of the current signal synthesizing unit 251, a first input terminal of the voltage signal synthesizing unit 253 is connected to an output terminal of the fourth controllable attenuation subunit 2431, a second input terminal of the voltage signal synthesizing unit 253 is connected to an output terminal of the fifth controllable attenuation subunit 2432, a third input terminal of the voltage signal synthesizing unit 253 is connected to an output terminal of the sixth controllable attenuation subunit 2433, and an input terminal of the voltage signal determining unit 254 is connected to an output terminal of the voltage signal synthesizing unit 253.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. The utility model provides an electric signal pickup assembly, with electric signal detection device communication connection, its characterized in that, electric signal pickup assembly includes:

2. The electrical signal acquisition device according to claim 1, wherein the preset electrical signals comprise current signals and voltage signals; accordingly, the signal acquisition module comprises: the device comprises a current signal acquisition unit and a voltage signal acquisition unit;

3. The electrical signal acquisition device of claim 2, wherein the first filtering module comprises: a first signal filtering unit and a second signal filtering unit; the input end of the first signal filtering unit is connected with the output end of the current signal acquisition unit, and the input end of the second signal filtering unit is connected with the output end of the voltage signal acquisition unit;

the first signal filtering unit is used for filtering the current signal;

the second signal filtering unit is used for filtering the voltage signal.

4. The electrical signal acquisition device of claim 3, wherein the controllable gain module comprises: the gain control device comprises a gain adjusting unit, a first controllable gain unit and a second controllable gain unit; a first control end of the gain adjusting unit is connected with a controlled end of the first controllable gain unit, a second control end of the gain adjusting unit is connected with a controlled end of the second controllable gain unit, an input end of the first controllable gain unit is connected with an output end of the first signal filtering unit, and an input end of the second controllable gain unit is connected with an output end of the second signal filtering unit;

5. The electrical signal acquisition device of claim 4, wherein the analog modulation module comprises: a first analog modulation unit and a second analog modulation unit; the input end of the first analog modulation unit is connected with the output end of the first controllable gain unit, and the input end of the second analog modulation unit is connected with the output end of the second controllable gain unit;

6. The utility model provides an electric signal detection device, with three electric signal pickup assembly communication connection, three electric signal pickup assembly is used for gathering the preset signal of telecommunication of the different phases of the three-phase alternating current that awaits measuring respectively, its characterized in that, electric signal detection device includes:

7. The electrical signal detection device of claim 6, wherein the preset electrical signal comprises a current signal and a voltage signal; correspondingly, the analog frequency-modulated signal comprises an analog frequency-modulated current signal corresponding to the current signal and an analog frequency-modulated voltage signal corresponding to the voltage signal;

8. The electrical signal detection device of claim 7, wherein the controllable attenuation module comprises: the device comprises an attenuation coefficient adjusting unit, a first controllable attenuation unit and a second controllable attenuation unit; a first control end of the attenuation coefficient adjusting unit is connected with a controlled end of the first controllable attenuation unit, a second control end of the attenuation coefficient adjusting unit is connected with a controlled end of the second controllable attenuation unit, an input end of the first controllable attenuation unit is connected with a first output end of the second filtering module, and an input end of the second controllable attenuation unit is connected with a second output end of the second filtering module;

9. The electrical signal detection device of claim 8, wherein the signal detection module comprises: a current signal synthesizing unit, a current signal judging unit, a voltage signal synthesizing unit and a voltage signal judging unit; the input end of the current signal synthesis unit is connected with the output end of the first controllable attenuation unit, the input end of the current signal judgment unit is connected with the output end of the current signal synthesis unit, the input end of the voltage signal synthesis unit is connected with the output end of the second controllable attenuation unit, and the input end of the voltage signal judgment unit is connected with the output end of the voltage signal synthesis unit;

10. A fault indicator comprising an electrical signal detection device according to any one of claims 6 to 9 and three electrical signal acquisition devices according to any one of claims 1 to 5.