Electric quantity sensor

Abstract

An electric quantity sensor comprises a main body and a plurality of current sampling holes arranged on the main body, the current sampling holes are used for a cable to pass through, and the main body comprises a plurality of voltage sensors; the device further comprises a plurality of voltage samplers connected with the voltage sensors in a one-to-one mode, and the voltage samplers are correspondingly consistent with the current sampling holes in position and phase. According to the invention, phase sequence misconnection during voltage sampling can be effectively reduced, and normal use of an electric quantity measurement function is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to an electrical quantity sensor. Background Art

[0002] A power sensor is a device used to measure the power consumption in a power system. It can convert power into electrical signals and then monitor the power usage in the system through these electrical signals. In scenarios such as comprehensive energy itemized metering and anti-reverse photovoltaic energy storage systems, a power sensor needs to be installed to monitor instantaneous data such as grid voltage, current, and power, so as to accurately classify and itemize the metering and assist the inverter in achieving zero-feedback function.

[0003] The current sampling of the power sensor in the prior art usually adopts an external open-type current sensor, and the voltage is separately wired for power collection and sampling. The external open-type current sensor is a device for measuring current. It works based on the Hall effect principle and is usually composed of one or more Hall elements, a magnetic core and a signal processing circuit. The voltage needs to be wired separately to obtain the voltage signal. The voltage sampling device is usually connected directly to two points in the circuit, such as the output end of the transformer or the load end of the circuit, to obtain the voltage signal. The power sensor is usually used in conjunction with a circuit breaker to monitor and control parameters such as voltage and current in the circuit. The circuit breaker cable passes through the current sampling hole on the power sensor to measure the current.

[0004] However, this technical solution has certain technical defects: during the installation of the external open-type current sensor, the voltage wiring may have a phase sequence error, which will not correctly correspond to the phase of the circuit, resulting in inaccurate measurement results. The wrong phase sequence may cause equipment damage or affect the correct operation of the protection device. Summary of the invention

[0005] In view of the above-mentioned defects in the prior art, the present invention provides an electric quantity sensor, which can effectively reduce the phase sequence misconnection during voltage sampling and ensure the normal use of the electric quantity measurement function.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A power sensor comprises a main body and a plurality of current sampling holes opened on the main body, wherein the current sampling holes are used for cables to pass through, and the main body comprises a plurality of voltage sensors; it also comprises a plurality of voltage samplers connected one-to-one with the plurality of voltage sensors, wherein the plurality of voltage samplers correspond to the plurality of current sampling holes in position and phase.

[0007] The cable of the circuit breaker (MCB or MCCB) passes through the current sampling hole to access the current, and the voltage sampler corresponding to the position is installed and fixed on the wiring terminal of the MCB or MCCB. Since the phase of the current sampling hole, the phase of the voltage sampler, and the phase of the circuit breaker cable correspond to each other, the installer can connect the wires in sequence to avoid crossing the voltage samplers. Therefore, the voltage and current can be sampled in phase without additional wiring, and the subject can obtain voltage and current sampling data.

[0008] Preferably, the main body further comprises a self-check module installed in the main body and used for judging whether the wiring is correctly connected by executing a self-check program.

[0009] In practice, the direction of the current sensor is easily reversed. If the wiring direction of the current sensor is reversed, it will affect the reading of the measuring instrument and the measurement accuracy of the meter. The power sensor is integrated with a self-test module to execute the self-test program to check whether the phase sequence wiring and the wiring direction of the current sensor are correct. The self-test program has built-in firmware algorithms to detect and diagnose the wiring status, such as phase sequence judgment algorithm, current direction detection algorithm and wiring pattern recognition algorithm. The firmware algorithm is a software program embedded in the hardware device, which controls the operation and function of the hardware device. Among them, the self-test program includes the following steps: First, the phase sequence judgment algorithm is executed to calculate the zero-crossing point sequence of each phase. The zero-crossing point refers to the point where the voltage waveform crosses the zero voltage level from positive to negative or from negative to positive, and then determine whether the phase sequence is normal. If the detection is normal, the current direction detection algorithm is executed.

[0010] The current direction detection algorithm, if the detection is normal, executes the wiring pattern recognition algorithm, if the current reverse is detected, an alarm indication is given; by checking whether the perforation direction is correct and combining it with the current actual power consumption (power consumption or power generation).

[0011] The wiring mode recognition algorithm includes sampling and acquiring data, calculating the phase deviation of each phase voltage to respectively identify the wiring mode. If the phase difference between each phase is 120 degrees, it is a three-phase four-wire system, otherwise it is a three-phase three-wire system.

[0012] The self-check module enables the power sensor to perform a self-check procedure, and checks whether the wiring is correct through the phase sequence judgment algorithm, current direction detection algorithm and wiring pattern recognition algorithm. This can effectively avoid system failures caused by wiring errors and enhance system reliability.

[0013] Preferably, the voltage sampler comprises a sampling cable connected to the main body and a sampling clip connected to the sampling cable; the sampling clip is used for voltage sampling after being connected to the circuit breaker terminal.

[0014] The voltage sampler is connected to the main body through a sampling cable. A sampling clip is designed at the end of the sampling cable to connect to the wiring terminal of the circuit breaker. The sampling clip is clip-shaped and made of metal to firmly clamp on the wiring terminal of the circuit breaker to ensure the stable transmission of the voltage signal. During installation, after the cable of the circuit breaker passes through the current sampling hole, the corresponding sampling clip is clamped on the wiring terminal of the circuit breaker. The sampling cable has been connected to the main body in advance, so the probability of wiring errors can be reduced.

[0015] Preferably, it also includes an indication module communicatively connected to the self-check module; the indication module includes a pulse indicator light, a current reverse indicator light and a wiring mode indicator light arranged on the main body; the self-check module executes a self-check program and promptly indicates wiring errors through the indication module.

[0016] The power sensor includes an indicator module, which is connected to the self-check module. The indicator module includes a variety of indicator lights, such as pulse indicator lights, current reversal indicator lights, and wiring mode indicator lights, which are used to display different status and error information. When the self-check module executes the self-check procedure and finds a wiring error, the indicator module will issue a warning through the corresponding indicator light. The indicator module provides users with instant status feedback through different indicator lights, allowing users to quickly identify the working status or problems of the system. The flashing frequency of the pulse indicator light represents the current power consumption. The higher the frequency, the greater the power.

[0017] Preferably, the self-check module comprises a check button for triggering the self-check procedure.

[0018] The self-test module includes a check button, which the user can press to trigger the self-test procedure. The check button provides a simple and intuitive operation method for users, allowing non-professionals to easily perform self-tests, improving the ease of use of the equipment.

[0019] Preferably, the body further comprises a phase mark representing the phase of the current sampling hole.

[0020] A phase mark is set on the main body to indicate the phase of the current sampling hole. The phase mark can be a color, symbol or number, matching the phase standard of the power system. The phase mark provides users with a clear phase indication, effectively preventing wiring errors caused by phase confusion. During the installation process, the phase mark can help technicians quickly identify the correct wiring position, improve the accuracy and efficiency of the installation, and help ensure the stability and reliability of the system.

[0021] Preferably, a communication module for information transmission is also included.

[0022] The communication module supports multiple communication modes, so that the power sensor can be flexibly connected to different data acquisition systems or monitoring platforms, improving the compatibility of the system. Through wireless communication modes such as Wifi, BLE, Lora, etc., remote data transmission can be achieved, making remote monitoring and fault diagnosis possible, and improving the response speed and maintenance efficiency of the system. The diversification of communication modules supports the construction of smart grids, so that the power sensor can be used as an important node in the smart grid to realize real-time data collection and analysis, and provide support for the optimization management of the power grid.

[0023] A method for installing the power sensor comprises the following steps: Install the main body under the circuit breaker; pass the cable through the current sampling hole according to the phase mark; install the voltage sampler corresponding to the position of the current sampling hole on the wiring terminal of the circuit breaker; Sending a self-check instruction to the self-check module triggers the self-check program, or waiting for the self-check module to trigger the self-check program by itself; indicating the wiring error through the indication module and correcting it.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention reduces the possibility of inaccurate measurement due to phase sequence errors by making the sampling phases of current and voltage correspond to each other. The integrated current and voltage sampling modules reduce the need for external wiring, simplify the installation process, and reduce the occurrence of problems caused by voltage wiring errors. Accurate voltage measurement can improve the reliability of the power system and ensure the effective implementation of power quality monitoring and energy-saving measures.

[0025] 2. The sampling clip allows quick and easy connection to the circuit breaker terminals, without the need for complex wiring work, greatly shortening the installation time. At the same time, the connection with the circuit breaker terminals provides stable electrical contact, reducing voltage signal distortion caused by poor contact. When the voltage sampler needs to be maintained or replaced, the sampling clip can be easily removed without the need for professional tools, reducing maintenance costs.

[0026] 3. The self-check module can detect the wiring status in real time and provide feedback to the user immediately if an error is found. The check button provides a simple and intuitive operation method for users, allowing non-professionals to easily perform self-checks, improving the usability of the equipment.

[0027] 4. The current reversal indicator and wiring mode indicator of the indicator module can guide users to quickly locate the problem and simplify the fault diagnosis process. The pulse indicator can remind users to pay attention to potential electrical risks, such as voltage fluctuations, so that preventive measures can be taken to improve the safety of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the structure of the electric quantity sensor of Example 1; Figure 2 is a bottom view of the electric quantity sensor of Example 1; Figure 3 It is a schematic diagram of the structure of the electric quantity sensor of Example 2.

[0029] in: 1. Main body; 11. Phase mark; 2. Current sampling hole; 3. Voltage sampler; 31. Sampling cable; 32. Sampling clip; 4. Self-test module; 41. Check button; 5. Indication module; 6. Communication module. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects of the invention easier to understand, the invention is further described with reference to specific diagrams. However, the invention is not limited to the following implementation cases.

[0031] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0032] Embodiment 1: like Figure 1 The electrical quantity sensor shown comprises a main body 1 and a plurality of current sampling holes 2 opened on the main body 1, the current sampling holes 2 are used for cables to pass through, the main body 1 comprises a plurality of voltage sensors; it also comprises a plurality of voltage samplers 3 connected one-to-one with the plurality of voltage sensors, the plurality of voltage samplers 3 correspond to the plurality of current sampling holes 2 in position and phase.

[0033] The cable of the circuit breaker (MCB or MCCB) passes through the current sampling hole 2 to access the current, and the voltage sampler 3 corresponding to the position is installed and fixed on the wiring terminal of the MCB or MCCB. Since the phase of the current sampling hole 2, the phase of the voltage sampler 3, and the phase of the circuit breaker cable correspond to each other, the installer can connect the wires in sequence to avoid crossing the voltage sampler 3. Therefore, the voltage and current can be sampled in phase without additional wiring, and the main body 1 obtains voltage and current sampling data.

[0034] Specifically, the voltage sampler 3 includes a sampling cable 31 connected to the main body 1 and a sampling clip 32 connected to the sampling cable 31; the sampling clip 32 is used to sample the voltage after being connected to the circuit breaker terminal. The voltage sampler 3 is connected to the main body 1 through the sampling cable 31, and a sampling clip 32 is designed at the end of the sampling cable 31 for connecting to the circuit breaker terminal. The sampling clip 32 is in the shape of a clip and is made of metal to firmly clamp the circuit breaker terminal to ensure the stable transmission of the voltage signal. During installation, after the cable of the circuit breaker passes through the current sampling hole 2, the corresponding sampling clip 32 is clamped on the circuit breaker terminal, and the sampling cable 31 has been connected to the main body 1 in advance, so the probability of wiring errors can be reduced. The size of the sampling clip 32 is adapted to circuit breakers (MCB or MCCB) of different current specifications, which is convenient for wiring installation.

[0035] The electric quantity sensor also includes a self-check module 4 installed in the main body 1 and used to determine whether the wiring is connected correctly by executing a self-check program. In practice, the direction of the current sensor is easily reversed. If the wiring direction of the current sensor is reversed, it will affect the reading of the measuring instrument and the measurement accuracy of the measuring instrument. The electric quantity sensor is integrated with a self-check module 4, which is used to execute a self-check program to check whether the phase sequence wiring and the wiring direction of the current sensor are correct. The self-check program has built-in firmware algorithms for detecting and diagnosing the wiring status, such as phase sequence judgment algorithms, current direction detection algorithms, and wiring pattern recognition algorithms. The firmware algorithm is a software program embedded in the hardware device, which controls the operation and function of the hardware device. Among them, the self-check program includes the following steps: First, the phase sequence judgment algorithm is executed. By calculating the zero-crossing point sequence of each phase, the zero-crossing point refers to the point where the voltage waveform crosses the zero voltage level from positive to negative or from negative to positive, and then judging whether the phase sequence is normal. If the detection is normal, the current direction detection algorithm is executed. If the current direction detection algorithm is normal, the wiring mode recognition algorithm is executed. If the current reverse is detected, an alarm indication is issued; by checking whether the perforation direction is correct and combining the current actual power consumption (power consumption or power generation). The wiring mode recognition algorithm includes sampling and acquiring data, calculating the phase deviation of each phase voltage to distinguish the wiring mode. If the phase difference between the two is 120 degrees, it is a three-phase four-wire system, otherwise it is a three-phase three-wire system.

[0036] The self-check module 4 enables the power sensor to execute a self-check procedure, and checks whether the wiring is correct through a phase sequence judgment algorithm, a current direction detection algorithm, and a wiring pattern recognition algorithm. This can effectively avoid system failures caused by wiring errors and enhance system reliability.

[0037] The self-check module 4 includes a check button 41 for triggering the self-check program. The self-check module 4 includes a check button 41, and the user can trigger the self-check program by pressing this button. The check button 41 provides a simple and intuitive operation method for the user, so that non-professionals can also easily perform self-checks, thereby improving the usability of the device.

[0038] Specifically, Figure 2 As shown, it also includes an indication module 5 that is communicatively connected to the self-check module 4; the indication module 5 includes a pulse indicator light, a current reversal indicator light and a wiring mode indicator light arranged on the main body 1; the self-check module 4 executes the self-check procedure and promptly indicates the wiring error through the indication module 5. The power sensor includes an indication module 5, which is communicatively connected to the self-check module 4. The indication module 5 includes a variety of indicator lights, such as a pulse indicator light, a current reversal indicator light, and a wiring mode indicator light, which are used to display different states and error messages. When the self-check module executes the self-check procedure and finds a wiring error, the indication module 5 will issue a warning through the corresponding indicator light. The indication module 5 provides the user with instant status feedback through different indicator lights, so that the user can quickly identify the working status or existing problems of the system. When the current reversal is detected, the current reversal indicator light is on, which is convenient for judging whether the wiring is correct according to the actual power consumption on site; the flashing frequency of the pulse indicator light represents the current power consumption, and the higher the frequency, the greater the power.

[0039] The main body 1 also includes a phase mark 11 representing the phase of the current sampling hole 2. The phase mark 11 is set on the main body 1 to indicate the phase of the current sampling hole 2. The phase mark 11 can be a color, a symbol or a number, which matches the phase standard of the power system. The phase mark 11 provides the user with a clear phase indication, effectively preventing wiring errors caused by phase confusion. During the installation process, the phase mark 11 can help technicians quickly identify the correct wiring position, improve the accuracy and efficiency of the installation, and the phase mark 11 helps to ensure the stability and reliability of the system.

[0040] The power sensor also includes a communication module 6 for information transmission. The communication module 6 supports multiple communication modes, so that the power sensor can be flexibly connected to different data acquisition systems or monitoring platforms, thereby improving the compatibility of the system. The communication module 6 supports communication modes such as RS485, PLC, Wifi, BLE, Lora, etc., and can timely transmit information such as each phase voltage, current, power and total power to the inverter / collector through one of the communication modes to achieve real-time monitoring of instantaneous data. Through wireless communication modes such as Wifi, BLE, Lora, etc., remote data transmission can be achieved, making remote monitoring and fault diagnosis possible, and improving the response speed and maintenance efficiency of the system. The diversification of the communication module 6 supports the construction of smart grids, so that the power sensor can be used as an important node in the smart grid to achieve real-time data collection and analysis, and provide support for the optimal management of the power grid.

[0041] On the other hand, the present invention includes a method for installing a power sensor according to claim 1, comprising the following steps: Install the main body 1 under the circuit breaker; pass the cable through the current sampling hole 2 according to the phase mark 11; install the voltage sampler 3 corresponding to the position of the current sampling hole 2 to the wiring terminal of the circuit breaker; send a self-test instruction to the self-test module 4 to trigger the self-test program, or wait for the self-test module 4 to trigger the self-test program by itself; indicate the wiring error through the indication module 5 and correct it.

[0042] According to different application scenarios, a self-check instruction can be sent to the sensor through the APP or the operating main controller, or the check button 41 can be pressed to trigger entering the self-check state and performing the self-check process.

[0043] Embodiment 2: like Figure 3 As shown, this embodiment is for a three-phase three-wire usage scenario, and when wiring, the N-phase sampling clip 32 and the L2' terminal must be connected to obtain power.

Claims

1. A power sensor, comprising a main body (1) and a plurality of current sampling holes (2) provided on the main body (1), wherein the current sampling holes (2) are used for cables to pass through, and the main body (1) comprises a plurality of voltage sensors; characterized in that: It also comprises a plurality of voltage samplers (3) connected one-to-one with the plurality of voltage sensors, wherein the plurality of voltage samplers (3) correspond to the plurality of current sampling holes (2) in position and phase.

2. The electrical quantity sensor according to claim 1, characterized in that: It also comprises a self-check module (4) installed in the main body (1) and used to determine whether the wiring is correctly connected by executing a self-check program.

3. The electrical quantity sensor according to claim 1, characterized in that: The voltage sampler (3) comprises a sampling cable (31) connected to the main body (1) and a sampling clip (32) connected to the sampling cable (31); the sampling clip (32) is used to perform voltage sampling after being connected to a circuit breaker terminal.

4. The electrical quantity sensor according to claim 2, characterized in that: It also comprises an indication module (5) which is communicatively connected to the self-checking module (4); the indication module (5) comprises a pulse indicator light, a current reverse indicator light and a wiring mode indicator light which are arranged on the main body (1); the self-checking module (4) executes a self-checking program and promptly indicates wiring errors through the indication module (5).

5. The electric quantity sensor according to claim 2, characterized in that: The self-check module (4) comprises a check button (41) for triggering the self-check program.

6. The electrical quantity sensor according to claim 1, characterized in that: The main body (1) also includes a phase mark (11) representing the phase of the current sampling hole (2).

7. The electrical quantity sensor according to claim 1, characterized in that: It also includes a communication module (6) for information transmission.

8. A method for installing the electric quantity sensor according to claim 2, characterized in that: The following steps are involved: The main body (1) is installed under the circuit breaker; the cable is passed through the current sampling hole (2) according to the phase mark (11); and the voltage sampler (3) corresponding to the position of the current sampling hole (2) is installed on the wiring terminal of the circuit breaker; Sending a self-check instruction to the self-check module (4) to trigger the self-check program, or waiting for the self-check module (4) to trigger the self-check program by itself; indicating the wiring error through the indication module (5) and correcting it.

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