Metering loop multifunctional detection device and detection method thereof

Abstract

The invention relates to the technical field of electric energy metering secondary circuits, in particular to a metering circuit multifunctional detection device and a detection method thereof, and the metering circuit multifunctional detection device comprises a power supply control module, a central calculation processing module, a signal output module and a detection module. According to the scheme, the signal output host and the test module are integrated into an all-in-one machine, and the detection method is a new method which is different from a traditional loop checking method by utilizing a signal compiling and signal detection technology based on the structural characteristics of the mutual inductor. According to the method, loop phase and polarity correctness check and impedance calculation can be completed, the check time of a set of loops is shortened to be within 5 minutes, detection can be completed, the loop state under the operation working condition can be indirectly evaluated, a new method for conducting secondary loop check verification under the condition that no wiring is disassembled is created for the first time by relying on the nondestructive detection technical thought, and the method is suitable for popularization and application. On the basis of the method, loop integrity check before commissioning is realized for the first time.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy metering secondary circuits, and in particular to a multifunctional detection device for a metering circuit and a detection method thereof. Background Art

[0002] In the electric energy metering system, the correctness of the secondary circuit wiring is directly related to the accuracy of electric energy metering and the safety of the equipment. The wiring error of the secondary circuit will not only lead to inaccurate metering data, but also may cause equipment damage or even safety accidents. Therefore, it is of great significance to detect the correctness of the secondary circuit wiring.

[0003] At present, the wiring inspection of the secondary circuit of electric energy metering mainly determines whether the wiring of the secondary circuit is correct by measuring the on-off state with a multimeter. The verification work requires at least three metering personnel (two operators and one guardian) to cooperate with each other. Usually, one operator is required on the primary side and one operator on the secondary side to remove the installed metering wires one by one. Then one person holds a multimeter to measure, and the other person holds a shorting wire to short-circuit the target wire, and verifies the wires one by one by shouting. Summary of the invention

[0004] In view of the above problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the present invention proposes a multifunctional detection device for a metering circuit, which can solve the problems of complex detection operation and low efficiency of secondary circuit wiring of electric energy metering.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a multifunctional detection device for a metering circuit, comprising a power control module, a central computing and processing module, electrically connected to the power control module; a signal output module, electrically connected to the central computing and processing module; a detection module, comprising a button unit and a measuring unit, the button unit and the measuring unit are electrically connected to the central computing and processing module; and a display module, electrically connected to the central computing and processing module.

[0007] As a preferred solution of the multifunctional detection device for the metering circuit of the present invention, the power control module includes a power supply unit and a charging unit, the charging unit is electrically connected to the power supply unit, and the power supply unit is electrically connected to the central computing and processing module, the signal output module, and the detection module.

[0008] As a preferred solution of the multifunctional detection device for the metering circuit of the present invention, the power control module further includes a power indicator light which can display the working status of the device.

[0009] As a preferred solution of the multifunctional detection device for metering circuits of the present invention, the signal output module is a PT and CT circuit signal output module, including a signal output indicator light for indicating the output status of the PT and CT circuit signals.

[0010] As a preferred solution of the multifunctional detection device for the metering circuit of the present invention, wherein: the detection module also includes an output port, a detection port and a detection indicator light, the output port includes A-phase current output terminal Ia, A-phase voltage output terminal Ua, B-phase voltage output terminal Ub, B-phase current output terminal Ib, C-phase voltage output terminal Uc, C-phase current output terminal Ic, voltage neutral line UN, current input terminal IN; the detection port includes a positive interface, a current transformer interface and a negative interface.

[0011] As a preferred solution of the multifunctional detection device for the metering circuit of the present invention, the power control module further includes a power control circuit board, and the power control circuit board is arranged inside the device.

[0012] As a preferred solution of the multifunctional detection device for the metering circuit of the present invention, the central computing and processing module and the detection module are integrated on a central control circuit board.

[0013] As a preferred solution of the multifunctional detection device for the metering circuit of the present invention, the operating voltage range of the power control module is 12V to 24V.

[0014] The second object of the present invention is to propose a detection method for a multifunctional detection device for a metering circuit, comprising the following steps: outputting PT and CT circuit signals; the measuring unit receives the electric energy metering output voltage signal and the mutual inductance signal; generating a test parameter instruction according to the input of the key unit, and the central calculation and processing module calculates the detection result and displays it on the display module.

[0015] As a preferred solution of the detection method of the multifunctional detection device for the metering circuit of the present invention, the size of the PT and CT circuit signals is generated by the key unit according to the key input.

[0016] The beneficial effects of the present invention are as follows: the present solution integrates the signal output host and the test module into an integrated machine, and uses battery charging and energy storage, without the need for an external power supply. The detection method is a new method based on the structural characteristics of the mutual inductor and utilizing signal compilation and signal detection technology, which is different from the traditional loop verification method. This method can complete loop phase identification, polarity correctness inspection and impedance calculation. The verification time of a set of loops is shortened to less than 5 minutes to complete the detection, and the loop status under the operating conditions can be indirectly evaluated. Relying on the idea of ​​non-destructive testing technology, a new method for secondary loop verification and verification without disassembling any wiring was pioneered. Based on this method, the loop integrity check before commissioning was realized for the first time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0018] Figure 1 This is a functional module block diagram of the multifunctional detection device for the metering circuit.

[0019] Figure 2 It is a schematic diagram of the principle of the multifunctional detection device for the metering circuit.

[0020] Figure 3 This is the logic processing block diagram of the multifunctional detection device for the metering loop. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0024] Example 1

[0025] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, and this embodiment provides a multifunctional detection device for a metering circuit. The multifunctional detection device for a metering circuit includes a power control module 100, a central computing and processing module 200, which is electrically connected to the power control module 100; a signal output module 300, which is electrically connected to the central computing and processing module 200; a detection module 400, including a button unit 401 and a measuring unit 402, and the button unit 401 and the measuring unit 402 are electrically connected to the central computing and processing module 200.

[0026] The power control module 100 provides power for each module of the device. By providing a stable power supply, the device can operate normally and provide necessary energy support for signal generation, processing and display during the detection process; the central calculation and processing module 200 is responsible for receiving signals and instructions from the detection module 400 and performing logical operations. Through calculation and processing, it can analyze the detection signal in real time, judge the correctness of the wiring and output the detection result; the signal output module 300 is responsible for generating PT and CT circuit signals to output the secondary circuit signal in the power system, thereby providing a detection signal source for wiring detection; the key unit 401 is configured to generate a control signal according to the key input, and the control signal is used to generate the control instruction; the measurement unit 402 collects the signal in the secondary circuit for processing by the central calculation and processing module 200; the central calculation and processing module 200 controls the signal output module 300, receives the instruction input by the key unit 401 and the input signal of the measurement unit 402, and obtains the detection result through the parameter configuration setting coefficient and the logical calculation processing. Through the input and measurement functions of the detection module 400, accurate detection of the secondary circuit can be effectively achieved; the display module 500 is used to display the detection results processed by the central computing and processing module in real time, so that the operator can intuitively understand the wiring status.

[0027] Example 2

[0028] Reference Figure 1 to Figure 3 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment.

[0029] Specifically, the power control module 100 includes a power supply unit 101 and a charging unit 102, the charging unit 102 is electrically connected to the power supply unit 101, and the power supply unit 101 is electrically connected to the central computing and processing module 200, the signal output module 300, and the detection module 400;

[0030] The power supply unit 101 ensures that each module obtains continuous power support when in use, and at the same time realizes the battery charging function through the charging unit 102, thereby enhancing the portability of the device.

[0031] Specifically, the power control module 100 also includes a power indicator light 103, which can display the working or shut-down status of the device;

[0032] When the power switch is pressed, the corresponding power indicator light 103 will be lit to indicate that the device is in the power-on state; when the switch is popped up, the corresponding indicator light will be extinguished.

[0033] Specifically, the signal output module 300 is a PT and CT loop signal output module, including a signal output indicator light 301 for indicating the output state of the PT and CT loop signals;

[0034] The PT and CT signal output modules output the voltage and current signals in the power secondary circuit, and the signal output indicator light 301 is used to indicate the output status of the signal, so that the operator can judge in real time whether the device is outputting the signal normally. After the wiring of the PT and CT circuit signal output terminals is completed, the output signal indicator light 301 is lit, and the display unit module 500 is configured to display the status of the PT and CT circuit signal output.

[0035] Specifically, the detection module 400 also includes an output port 403, a detection port 404 and a detection indicator light 405, the output port 403 includes an A-phase current output terminal Ia, an A-phase voltage output terminal Ua, a B-phase voltage output terminal Ub, a B-phase current output terminal Ib, a C-phase voltage output terminal Uc, a C-phase current output terminal Ic, a voltage neutral line UN, and a current input terminal IN; the detection port 404 includes a positive-side interface 404a, a current transformer interface 404b and a negative-side interface 404c;

[0036] The output port 403 is used to access the current and voltage signals of the three phases A, B, and C. The detection port 404 includes a positive terminal interface 404a, a current transformer interface 404b, and a negative terminal interface 404c, ensuring that the device can adapt to different power metering equipment and perform a variety of signal detection.

[0037] Specifically, the power control module 100 further includes a power control circuit board 104, which is disposed inside the device;

[0038] The power control circuit board 104 is disposed inside the device to reasonably distribute and manage the power requirements of each module and improve the stability of the device.

[0039] Specifically, the central computing and processing module 200 and the detection module 400 are integrated on the central control circuit board M; the internal space structure is optimized to make the device more compact and stable.

[0040] Specifically, the operating voltage range of the power control module 100 is 12V to 24V;

[0041] This voltage range ensures that the device can work stably in a normal power environment while avoiding equipment failures caused by voltage fluctuations.

[0042] After the energy metering is connected, connect the multifunctional detection device for the correctness of the secondary circuit wiring of the energy metering as follows: Figure 2 The wiring method shown is connected to turn on the power switch, first connect the A-phase voltage output terminal Ua of the device to the A-phase voltage input terminal of the electric energy meter through a blue line, connect the A-phase current output terminal Ia to the A-phase current input terminal of the electric energy meter through a blue line, connect the B-phase voltage output terminal Ub to the B-phase voltage input terminal of the electric energy meter through a green line, connect the B-phase current output terminal Ib to the B-phase current input terminal of the electric energy meter through a green line, connect the C-phase voltage output terminal Uc to the C-phase voltage input terminal of the electric energy meter through a red line, connect the C-phase current output terminal Ic to the A-phase current input terminal of the electric energy meter through a red line, connect the voltage neutral line UN to the neutral line input terminal of the electric energy meter through a black line, and connect the ABC three-phase current output terminals of the electric energy meter to the current input terminal IN of the device, so that the initial wiring is completed, and the signal output indicator 301 lights up at this time;

[0043] Press the function switch in the function button unit, select the test type in the display screen unit module, such as current secondary circuit phase detection, select OK in the display screen unit module to start the test, and the indicator light of the test signal module flashes. When the test signal module indicates that the stop light flashes, a beep is heard at the same time, and the test result is recorded and displayed in the display screen unit module.

[0044] Example 3

[0045] Reference Figure 1 to Figure 3 , which is the third embodiment of the present invention, provides a detection method for a multifunctional detection device for a metering circuit, comprising the following steps:

[0046] Output PT and CT loop signals, turn on the power switch, and output PT and CT signals after completing the initial wiring;

[0047] The measuring unit 402 receives the electric energy metering output voltage signal and the mutual inductance signal;

[0048] According to the command for generating inspection parameters inputted by the key unit 401 , the central calculation and processing module 200 calculates the inspection result and displays it on the display module 500 .

[0049] When in use, the negative terminal 404c is connected to the zero line output terminal of the electric energy meter; first determine the phase sequence, and connect the test terminal as Figure 2 The red output line of the positive interface 404a touches the three-phase voltage input terminals ABC of the electric energy meter in sequence, and the display unit will prompt whether it is a positive phase sequence or a reverse phase sequence;

[0050] When detecting the voltage and line voltage, first click the corresponding function of the button unit 401, and the positive interface 404a touches the three-phase voltage input terminals of the electric energy meter ABC through the red line, and the display screen unit is recorded as Ua, Ub, and Uc. At the same time, the measured line voltage display screen unit is recorded as Uab, Uca, and Ubc;

[0051] When detecting current, first click the corresponding function of the button unit 401. The positive interface 404a touches the three-phase current input terminals of the electric energy meter ABC through the red line, and the current transformer interface touches the three-phase current output terminals of the electric energy meter ABC through the black line. The display screen units are recorded as Ia, Ib, and Ic. The device correctly judges the secondary circuit voltage and current phase, polarity detection, impedance, and open circuit and short circuit through the phase sequence, Ua, Ub, Uc, Uab, Uca, Ubc and the values ​​and parameters of Ia, Ib, and Ic.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multifunctional detection device for a metering circuit, characterized in that: include, A power control module (100), A central computing and processing module (200) electrically connected to the power control module (100); A signal output module (300) electrically connected to the central computing and processing module (200); A detection module (400) comprises a key unit (401) and a measuring unit (402), wherein the key unit (401) and the measuring unit (402) are electrically connected to the central computing and processing module (200); The display module (500) is electrically connected to the central computing and processing module (200).

2. The multifunctional detection device for metering circuit according to claim 1, characterized in that: The power control module (100) comprises a power supply unit (101) and a charging unit (102); the charging unit (102) is electrically connected to the power supply unit (101); and the power supply unit (101) is electrically connected to the central computing and processing module (200), the signal output module (300), and the detection module (400).

3. The multifunctional detection device for metering circuit according to claim 2, characterized in that: The power control module (100) also includes a power indicator light (103) capable of displaying the working status of the device.

4. The multifunctional detection device for metering circuit according to claim 3, characterized in that: The signal output module (300) is a PT and CT loop signal output module, comprising a signal output indicator light (301) for indicating the output state of the PT and CT loop signals.

5. The multifunctional detection device for metering circuit according to claim 4, characterized in that: The detection module (400) further comprises an output port (403), a detection port (404) and a detection indicator light (405), wherein the output port (403) comprises an A-phase current output terminal (Ia), an A-phase voltage output terminal (Ua), a B-phase voltage output terminal (Ub), a B-phase current output terminal (Ib), a C-phase voltage output terminal (Uc), a C-phase current output terminal (Ic), a voltage neutral line (UN), and a current input terminal (IN); The detection port (404) includes a positive-side interface (404a), a current transformer interface (404b) and a negative-side interface (404c).

6. The multifunctional detection device for metering circuit according to claim 5, characterized in that: The power control module (100) further comprises a power control circuit board, and the power control circuit board (104) is arranged inside the device.

7. The multifunctional detection device for metering circuit according to claim 6, characterized in that: The central computing and processing module (200) and the detection module (400) are integrated on a central control circuit board.

8. The multifunctional detection device for metering circuit according to claim 7, characterized in that: The operating voltage range of the power control module (100) is 12V to 24V.

9. A detection method for a multifunctional detection device for a metering circuit, characterized in that: The following steps are involved: Output PT, CT loop signal; The measuring unit (402) receives an electric energy metering output voltage signal and a mutual inductance signal; According to the test parameter instruction generated by the key unit (401), the central calculation processing module (200) calculates the test result and displays it on the display module (500).

10. The detection method of the multifunctional detection device for metering circuit according to claim 9, characterized in that: The PT and CT loop signal sizes are generated by the key unit (401) according to key input.

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