Current clamp, electrical measurement equipment and host system

Abstract

A current clamp, an electrical measurement device and a host system. The current clamp comprises a signal acquisition module, a signal conditioning module, a signal conversion module, a signal transmission module and a synchronization module. The signal acquisition module acquires a first current signal of a to-be-detected object and generates a second current signal according to the first current signal. The signal conditioning module generates an analog voltage signal according to the second current signal. The signal conversion module converts the analog voltage signal into a digital signal. A wired signal transmission module in the signal transmission module transmits the digital signal to a host of the current clamp in a wired manner. And a wireless signal transmission module in the signal transmission module wirelessly transmits the digital signal to a host. The host collects a first signal of a to-be-detected object. The synchronization module comprises a wired synchronization module and a wireless synchronization module. And the wired synchronization module and the wireless synchronization module are in communication connection with the host, so that the sampling time of the second current signal is synchronized with the sampling time of the first signal. The current clamp can stably transmit signal data.

Description

Technical Field

[0001] This application relates to the field of electrical measurement devices, and particularly to a current clamp, an electrical measurement device, and a host system. Background Art

[0002] According to the prior art, a wireless current clamp realizes real-time monitoring and fault diagnosis of current parameters in a power system through wireless signal transmission technology.

[0003] The inventors of this application have found that in practical applications, wireless signals are vulnerable to interference in a complex electromagnetic environment, resulting in problems such as signal strength fluctuations, phase shifts, and even signal loss, thereby making signal transmission unstable and affecting measurement accuracy. For example, in an industrial site, there are many interference sources such as high-frequency devices and radio waves, which makes the reliability of wireless signal transmission insufficient, and further leads to a decrease in the accuracy of power monitoring and fault diagnosis of the wireless current clamp. Summary of the Utility Model

[0004] This application aims to provide a current clamp that can stably transmit signal data.

[0005] According to one aspect of this application, a current clamp is provided. The current clamp includes a signal acquisition module, a signal conditioning module, a signal conversion module, a signal transmission module, and a synchronization module. The signal acquisition module is disposed in the clamp arm of the current clamp, acquires a first current signal of an object to be detected, and generates a second voltage signal according to the first current signal. The signal conditioning module generates an analog voltage signal according to the second current signal. The signal conversion module receives the analog voltage signal and converts the analog voltage signal into a digital signal. The signal transmission module includes a wired signal transmission module and a wireless signal transmission module. The wired signal transmission module is wired to a host connected to the current clamp. The wired signal transmission module receives the digital signal and transmits the digital signal to the host. The wireless signal transmission module is wirelessly connected to the host. The wireless signal transmission module receives the digital signal and transmits the digital signal to the host. Wherein, the host acquires a first signal of the object to be detected, the host receives the digital signal transmitted by the wired signal transmission module, and / or, the host receives the digital signal transmitted by the wireless signal transmission module. The synchronization module is connected to the host. The synchronization module includes a wired synchronization module and a wireless synchronization module. The wired synchronization module is wired to the host to synchronize the sampling time of the second current signal with the sampling time of the first signal. The wireless synchronization module is wirelessly connected to the host to synchronize the sampling time of the second current signal with the sampling time of the first signal.

[0006] According to some embodiments of the present application, the current clamp further includes a voltage conversion module, a wired interface, and a wireless charging module. The voltage conversion module is connected to the signal conditioning module, the signal conversion module, the signal transmission module, and the synchronization module. When the host receives the digital signal transmitted by the wired signal transmission module, one end of the wired interface is connected to the voltage conversion module, and the other end of the wired interface is connected to the host, so that the host supplies power to the signal conditioning module, the signal conversion module, the signal transmission module, and the synchronization module through the voltage conversion module. When the host does not receive the digital signal transmitted by the wired signal transmission module, the wireless charging module is connected to the voltage conversion module, so that the wireless charging module supplies power to the signal conditioning module, the signal conversion module, the signal transmission module, and the synchronization module through the voltage conversion module.

[0007] According to some embodiments of the present application, the wired signal transmission module is connected to the host through a wired transmission cable to send a digital signal to the host. The wired synchronization module is connected to the host through a wired transmission cable to synchronize the sampling time of the second current signal with the sampling time of the first signal.

[0008] According to some embodiments of the present application, the wireless signal transmission module is connected to the host through WiFi or Bluetooth to send a digital signal to the host.

[0009] According to some embodiments of the present application, the wireless synchronization module is connected to the host through Bluetooth, 2G, 3G, 4G, 5G, below 1 GHz, WiFi, ZigBee protocol, a custom wireless transmission protocol, and the Global Navigation Satellite System to synchronize the sampling time of the second current signal with the sampling time of the first signal.

[0010] According to some embodiments of the present application, the current clamp is applied to a power system, and the object to be detected is the transmission line of the power system.

[0011] According to one aspect of the present application, there is provided an electrical measurement device, which includes the current clamp as described above.

[0012] According to one aspect of the present application, there is provided a host system, which includes the current clamp and the host as described above.

[0013] Advantageous Effects

[0014] Through the above technical solutions, the present application can improve the stability of data transmission by selecting the wired signal transmission mode or the wireless signal transmission mode to transmit the signal of the current clamp, solve the problem of unstable data transmission of the wireless current clamp, and improve the convenience and stability of electrical measurement. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0016] Figure 1 Schematic structural diagram of a current clamp showing an embodiment of the present application;

[0017] Figure 2 Schematic structural diagram of the clamp arm and the accommodating cavity of a current clamp showing an embodiment of the present application;

[0018] Figure 3 Another schematic structural diagram of a current clamp showing an embodiment of the present application.

[0019] Reference numerals

[0020] Current clamp 1; Host 2; Clamp arm 3; Accommodating cavity 4.

[0021] Signal acquisition module 11; Signal conditioning module 12; Signal conversion module 13; Signal transmission module 14; Synchronization module 15; Voltage conversion module 16; Wired interface 17; Wireless charging module 18.

[0022] Wired signal transmission module 141; Wireless signal transmission module 142.

[0023] Wired synchronization module 151; Wireless synchronization module 152. Detailed implementation manners

[0024] Now, the exemplary embodiments will be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. Identical reference numerals in the figures denote identical or similar parts, and thus their repeated description will be omitted.

[0025] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of these specific details, or can be implemented in other ways, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0026] Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0027] The terms "first", "second", etc. in the description and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0028] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0029] According to one aspect of this application, a current clamp 1 is provided. Refer to Figure 1 , the current clamp 1 includes a signal acquisition module 11, a signal conditioning module 12, a signal conversion module 13, a signal transmission module 14 and a synchronization module 15.

[0030] According to an exemplary embodiment, refer to Figure 2 , the current clamp 1 may include a clamping arm 3 at the front end of the current clamp 1 and a receiving cavity 4 at the rear end of the current clamp 1. The signal acquisition module 11 may be disposed in the clamping arm 3 of the current clamp 1. The signal conditioning module 12, the signal conversion module 13, the signal transmission module 14 and the synchronization module 15 may be disposed in the receiving cavity 4.

[0031] Refer to Figure 1 , the signal acquisition module 11 acquires the current signal of the object to be detected (such as a power transmission line). For example, the core components of the signal acquisition module 11 include an iron core and a precision-wound secondary coil. The iron core is disposed in the two arm bodies of the clamping arm 3, and the iron core forms a closed iron core loop. The iron core is used to sense the first current signal passing through the clamping area. The secondary coil is wound around the iron core, and these coils constitute the key part of converting the first current signal into the second current signal. When the clamping arms 3 of the current clamp 1 are closed and clamped on the object to be detected, the first current signal flowing through the object to be detected induces a first magnetic flux in the iron core, and then a second current signal corresponding to the first current signal is induced in the preset secondary coil through the principle of electromagnetic induction.

[0032] Refer to Figure 1, the signal conditioning module 12 amplifies, filters, linearizes, etc. the second current signal input by the signal acquisition module 11, generates an analog voltage signal and transmits the analog voltage signal. The analog voltage signal is an analog voltage signal that the signal conversion module 13 can process. For example, the signal conditioning module 12 can be a sampling resistor or an operational amplifier, which amplifies, filters, etc. the second current signal output by the signal acquisition module 11 to optimize the quality and reliability of the voltage signal, and converts the second current signal into an analog voltage signal that the signal conversion module 13 can process.

[0033] See Figure 1 , the signal conversion module 13 is connected to the output terminal of the signal conditioning module 12 and receives the analog voltage signal. The signal conversion module 13 converts the analog voltage signal into a digital signal and transmits the digital signal. The digital signal can be a discrete digital signal representing high and low levels. For example, the signal conversion module 13 can be an analog-to-digital conversion chip that converts the analog voltage signal into a discrete digital signal.

[0034] According to the example embodiment, see Figure 1 , the signal transmission module 14 includes a wired signal transmission module 141 and a wireless signal transmission module 142.

[0035] The wired signal transmission module 141 is wired-connected to the host 2 connected to the current clamp 1. The wired signal transmission module 141 receives the digital signal and transmits the digital signal to the host 2. For example, the wired signal transmission module 141 receives the digital signal and transmits it to the host 2.

[0036] The wireless signal transmission module 142 is wirelessly connected to the host 2. The wireless signal transmission module 142 receives the digital signal and transmits the digital signal to the host 2. For example, the wireless signal transmission module 142 receives the digital signal and transmits it to the host 2.

[0037] The host 2 acquires the first signal of the object to be detected. The first signal can be a voltage signal and a pulse signal. For example, the host 2 can acquire the voltage signal of the object to be detected (such as a power transmission line) through a voltage clamp, or the host 2 can also acquire the pulse signal of the object to be detected (such as a meter to be tested) through an optical sampling device.

[0038] The host 2 can receive the digital signal transmitted by the wired signal transmission module 141, or the host 2 receives the digital signal transmitted by the wireless signal transmission module 142. The host 2 can also receive the digital signals transmitted by both the wired signal transmission module 141 and the wireless signal transmission module 142 simultaneously, and can check the digital signals.

[0039] After the host 2 receives the digital signal, voltage signal and pulse signal, it can perform electrical parameter calculations on these signals to detect the operating state of the object to be detected.

[0040] According to the exemplary embodiment, the synchronization module 15 is connected to the host 2. The synchronization module 15 includes a wired synchronization module 151 and a wireless synchronization module 152.

[0041] The wired synchronization module 151 is connected to the host 2 in a wired manner so that the sampling time of the second current signal is synchronized with the sampling time of the first signal.

[0042] For example, when the host 2 receives the digital signal transmitted by the wired signal transmission module 141, the wired synchronization module 151 is connected to the host 2. The processing unit inside the host 2 analyzes the received digital signal data, extracts the measurement values of the second current signal and the first current signal. The processing unit inside the host 2 can also extract the synchronization mark or time stamp in the digital signal. The wired synchronization module 151 can receive the time signal of the local clock of the host 2, and the wired synchronization module 151 transmits the time signal to the signal conversion module 13. It is possible to realize the synchronous measurement of the second current signals of multiple objects to be collected received by the host 2, so as to realize the synchronization of the sampling time of the second current signal and the sampling time of the first signal collected by the host 2.

[0043] The wireless synchronization module 152 is wirelessly connected to the host 2 so that the sampling time of the second current signal is synchronized with the sampling time of the first signal.

[0044] For example, when the host 2 receives the digital signal transmitted from the wireless signal transmission module 142, the wireless synchronization module is communicatively connected to the host 2. The digital signal may include the measurement value of the second current signal of the object to be collected, and possibly the local synchronization pulse information. The processing unit inside the host 2 analyzes the received digital signal, extracts the measurement value of the second current signal. The processing unit inside the host 2 can also extract the synchronization mark or time stamp in the digital signal. The wireless synchronization module 152 can receive the standard time information of the local clock of the host 2, and the wireless synchronization module 152 transmits the time information to the signal conversion module 13. It is possible to realize the synchronous measurement of the current signals of multiple objects to be collected received by the host 2, so as to realize the synchronization of the sampling time of the second current signal and the sampling time of the first signal collected by the host 2.

[0045] Through the above embodiments, the present application can improve the stability of data transmission by selecting the wired signal transmission mode or the wireless signal transmission mode to transmit the signal of the current clamp, solve the problem of unstable data transmission of the wireless current clamp, and improve the convenience and stability of electrical measurement.

[0046] By converting the analog voltage signal into a digital signal, this application can convert the weak voltage signal induced by the current clamp into a high-quality and high-precision digital signal. By transmitting the digital signal to the host, this application can maintain the quality of signal transmission and reduce the influence of signal attenuation and noise interference. Moreover, the processing algorithm of the digital signal is relatively simple compared with the analog signal, which can reduce the complexity of signal processing.

[0047] The inventors of this application have found that in the case where the traditional wireless current clamp needs to be hung at the detection site for a long time for testing, the traditional wireless current clamp will be limited in use due to insufficient battery life.

[0048] Optionally, referring to Figure 3 , the current clamp 1 further includes a voltage conversion module 16, a wired interface 17, and a wireless charging module 18.

[0049] According to the exemplary embodiment, the voltage conversion module 16 is connected to the signal conditioning module 12, the signal conversion module 13, the signal transmission module 14, and the synchronization module 15. The voltage conversion module 16 can convert the voltage value and supply power to the signal conditioning module 12, the signal conversion module 13, the signal transmission module 14, and the synchronization module 15.

[0050] Referring to Figure 3 , the wired interface 17 is connected to the voltage conversion module 16. When the host 2 receives the digital signal transmitted by the wired signal transmission module 141, one end of the wired interface 17 is connected to the voltage conversion module 16, and the other end of the wired interface 17 is connected to the host 2, so that the host 2 supplies power to the signal conditioning module 12, the signal conversion module 13, the signal transmission module 14, and the synchronization module 15 through the voltage conversion module 16.

[0051] For example, when the wired interface 17 detects that the wired signal transmission module 141 and the wired synchronization module 151 of the current clamp 1 are connected to the host 2 in a wired manner, the voltage conversion module 16 immediately recognizes it as the wired mode. In the wired mode, the voltage conversion module 16 preferentially uses the external power supply (host 2) to supply power and can charge the wireless charging module 18 according to the battery capacity of the wireless charging module 18.

[0052] Referring to Fig. 3, the wireless charging module 18 is connected to the voltage conversion module 16. When the host 2 receives the digital signal transmitted by the wireless signal transmission module 142, the wireless charging module 18 is connected to the voltage conversion module 16, so that the power of the wireless charging module is converted through the voltage conversion module 16 and supplies power to the signal conditioning module 12, the signal conversion module 13, the signal transmission module 14, and the synchronization module 15.

[0053] For example, the wireless charging module 18 receives energy using a lithium battery. The wireless charging module 18 can also transmit power information to detect and control the chip through an intelligent charging algorithm. When the wired interface module 17 does not detect a wired connection and the device is in a normal operating state (for example, the wireless signal transmission module 142 is transmitting data wirelessly), the voltage conversion module 16 can automatically identify and switch to the wireless mode. In the wireless mode, the voltage conversion module 16 can notify and adjust parameters such as the operating frequency and power distribution of the signal conditioning module 12, the signal conversion module 13, the signal transmission module 14, and the synchronization module 15 according to the current load demand, reducing unnecessary energy consumption.

[0054] Through the above embodiments, the present application provides electrical energy to the current clamp 1 through two optional modes of wired signal transmission and wireless signal transmission, effectively solving the problem of insufficient battery life of traditional wireless current clamps 1 during long-term use and ensuring the continuity and reliability of test work.

[0055] Optionally, the wired signal transmission module 141 and the wired synchronization module 151 can be connected to the host 2 through a wired transmission cable to send digital signals to the host 2. The wired transmission cable can be a standard data communication cable to ensure wide compatibility and reliable connectivity. When the wired interface 17 is connected to an external host 2 through a wired transmission cable, the wired transmission cable can not only carry out basic data exchange tasks, but also adopt high-speed transmission technology to support multiple data transmission protocols, thereby significantly enhancing the transmission rate and efficiency of digital signals and ensuring high-speed, accurate, and delay-free transmission of data.

[0056] For example, the wired transmission cable can use a data cable with a Type-C interface. The Type-C interface not only supports the data transmission speed of Universal Serial Bus (USB) 3.x and higher versions, but also integrates multiple functions such as video transmission, audio transmission, and charging. The Type-C interface itself does not directly define the transmission protocol, but it can support the transmission of multiple protocols (such as USB, DisplayPort (DP), Thunderbolt, etc.). When the Type-C interface is used for data transmission, the Type-C interface can implement the high-speed transmission technology specified by these protocols.

[0057] The wired synchronization module 151 can be connected to the host 2 through a wired transmission cable, receive the sampling time of the host 2, and thus connect and coordinate the operations between the current clamp 1 and the host 2 to achieve the synchronization of the sampling time of the second current signal with the sampling time of the first signal, so as to realize the synchronization of the sampling time of the second current signals of multiple objects to be detected with the sampling time of the first signal collected by the host 2. This synchronization method relies on physical connection (wired transmission cable) and standard communication protocols, ensuring the accuracy and reliability of synchronization.

[0058] During the wired transmission of digital signals, the wired signal transmission module 141 can effectively resist the noise and interference in the channel through error detection and correction technologies, ensuring the stable transmission of digital signals. The length of the wired transmission cable can be customized according to the transmission distance.

[0059] Optionally, the wireless signal transmission module 142 is connected to the host 2 through WiFi or Bluetooth. For example, the wireless signal transmission module 142 can transmit digital signals to the host 2 through wireless communication technologies such as WiFi and Bluetooth. Affected by signal frequency, environmental sound speed, device performance, configuration, etc., the transmission distance of Bluetooth is usually between a few meters and dozens of meters, and the transmission distance of WiFi ranges from dozens of meters to hundreds of meters, so that fast and reliable transmission of digital signals can be achieved within a relatively long distance range.

[0060] Through the above embodiments, the present application can improve the flexibility of using the current clamp through the above wireless communication technologies, allowing users to operate without being restricted by wires, and can also enhance the convenience of the current clamp, enabling users to freely choose the communication method according to their needs and optimizing work efficiency.

[0061] Optionally, the wireless synchronization module 152 is connected to the host 2 through Bluetooth, 2G, 3G, 4G, 5G, Sub-1Gigahertz (sub1G), WiFi, ZigBee, and Global Navigation Satellite System (GNSS).

[0062] For example, the wireless synchronization module 152 can be a timing device, such as a Global Navigation Satellite System (GNSS), a 5G module, or other timing devices. After obtaining the standard time information through timing technologies (such as GNSS timing technology, Global Positioning System (GPS) timing technology), the wireless synchronization module 152 can achieve the sampling time synchronization of the current signal sampling time and the sampling time of the first signal collected by the host 2.

[0063] For another example, the wireless synchronization module 152 can also be a radio frequency module. The radio frequency module can receive the time information of the local clock of the host 2 through transmission methods such as Bluetooth, 2G, 3G, 4G, 5G, Sub-1 Gigahertz (sub1G), WIFI, ZigBee protocol, and custom wireless transmission protocols. The radio frequency module can also send the local clock information to the host 2. The radio frequency module (wireless synchronization module 152) then calibrates the device clock by exchanging timestamps and measuring network latency, so as to achieve an accurate time synchronization function, effectively ensuring that the phase angle transmitted by the wireless signal transmission module 142 coincides with the waveform of the current signal, thus realizing the wireless accurate transmission function of real-time measurement and ensuring the accurate implementation of related functions such as transformation ratio angle difference.

[0064] Optionally, the current clamp 1 is applied to the power system, and the object to be detected is the transmission line of the power system. The signal acquisition module 11 of the current clamp 1 can acquire the current signal of the transmission line.

[0065] According to one aspect of the present application, there is provided an electrical measurement device, which includes the current clamp 1 as described above.

[0066] According to one aspect of the present application, there is provided a host 2 system, which includes the current clamp 1 and the host 2 as described above.

[0067] Finally, it should be noted that the above are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions of the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A current clamp, characterized in that, The current clamp includes: A signal acquisition module, disposed in the clamp arm of the current clamp, for acquiring a first current signal of an object to be detected and inductively generating a second current signal according to the first current signal; A signal conditioning module, for receiving the second current signal and generating an analog voltage signal according to the second current signal; A signal conversion module, for receiving the analog voltage signal and converting the analog voltage signal into a digital signal; A signal transmission module, including: A wired signal transmission module, which is wired to a host connected to the current clamp. The wired signal transmission module receives the digital signal and transmits the digital signal to the host; A wireless signal transmission module, which is wirelessly connected to the host. The wireless signal transmission module receives the digital signal and transmits the digital signal to the host. Wherein, the host acquires a first signal of the object to be detected, the host receives the digital signal transmitted by the wired signal transmission module, and / or the host receives the digital signal transmitted by the wireless signal transmission module; A synchronization module, connected to the host, the synchronization module includes: A wired synchronization module, which is wired to the host to synchronize the sampling time of the second current signal with the sampling time of the first signal; A wireless synchronization module, which is wirelessly connected to the host to synchronize the sampling time of the second current signal with the sampling time of the first signal.

2. The current clamp according to claim 1, wherein The current clamp further includes: A voltage conversion module, connected to the signal conditioning module, the signal conversion module, the signal transmission module and the synchronization module; A wired interface. When the host receives the digital signal transmitted by the wired signal transmission module, one end of the wired interface is connected to the voltage conversion module, and the other end of the wired interface is connected to the host, so that the host supplies power to the signal conditioning module, the signal conversion module, the signal transmission module and the synchronization module through the voltage conversion module; A wireless charging module. When the host receives the digital signal transmitted by the wireless and wired signal transmission modules, the wireless charging module is connected to the voltage conversion module, so that the wireless charging module supplies power to the signal conditioning module, the signal conversion module, the signal transmission module and the synchronization module through the voltage conversion module.

3. The current clamp according to claim 1, characterized in that, The wired signal transmission module is connected to the host through a wired transmission cable to send the digital signal to the host; The wired synchronization module is connected to the host through the wired transmission cable to synchronize the sampling time of the second current signal with the sampling time of the first signal.

4. The current clamp according to claim 1, characterized in that, The wireless signal transmission module is connected to the host through WiFi or Bluetooth to send the digital signal to the host.

5. The current clamp according to claim 1, characterized in that, The wireless synchronization module is connected to the host through Bluetooth, 2G, 3G, 4G, 5G, below 1 GHz, WiFi, ZigBee protocol, custom wireless transmission protocol and global navigation satellite system to synchronize the sampling time of the second current signal with the sampling time of the first signal.

6. The current clamp according to any one of claims 1-5, characterized in that, The current clamp is applied to a power system, and the object to be detected is a transmission line of the power system.

7. An electrical measuring device, characterized in that, The electrical measurement device includes any one of the current clamps described in claims 1-5.

8. A host system, characterized in that, The host system includes any one of the current clamps described in claims 1-5 and the host.

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