Incoming wire metering cabinet secondary circuit rapid wire checking device and use method thereof

Abstract

The invention discloses an incoming line metering cabinet secondary circuit rapid line checking device and a using method thereof.The rapid line checking device comprises a handheld detector, an upper protective sleeve, a lower protective sleeve and a connecting line assembly, the upper protective sleeve and the lower protective sleeve are arranged at the upper end and the lower end of the handheld detector in a sleeving mode respectively, and the connecting line assembly comprises a plurality of connecting lines; the sensor is connected to a wiring terminal of the handheld detector for measurement; according to the device, a secondary circuit in the inlet wire metering cabinet is detected through the handheld detector and the connecting wire assembly, the S1 side of the secondary winding of the voltage transformer and the S1 side of the secondary winding of the current transformer are prevented from being detached under the condition that the space of the inlet wire metering cabinet is narrow, an alligator clip of the connecting wire assembly is directly used for connection, operation is easy, use is convenient, and cost is low. According to the use method, the wiring process is defined, convenience is provided for operation of operators, and the operation efficiency is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of inspection and maintenance of electric power meter cabinets, and in particular to a secondary circuit rapid line verification device of an incoming line meter cabinet and a use method thereof. Background Art

[0002] The power meter cabinet converts high voltage and large current into low voltage and small current suitable for measurement by the electric energy meter through voltage transformer and current transformer, so as to accurately measure the power consumption and establish the connection calculation basis between the power supply department and the user. At the same time, the power meter cabinet also has a protection function, which can trip in time when the circuit is overloaded, short-circuited or other abnormal conditions occur, protecting the circuit and equipment, avoiding equipment damage or threats to personal safety.

[0003] The secondary circuit of the power meter cabinet mainly includes: measurement circuit, relay protection and automatic device circuit, switch control and signal circuit, and operating power supply system. The measurement circuit is composed of various measuring instruments and related circuits, which are used to indicate or record the operating parameters of the primary equipment and help the operating personnel to understand the operating status of the equipment; the relay protection and automatic device circuit is composed of measurement, comparison, logic judgment and execution parts, which are used to automatically determine the operating status of the primary equipment, automatically trip the circuit breaker or send a fault signal when a fault or abnormality occurs in the system, and quickly restore the normal operation of the system after the fault is eliminated; the switch control and signal circuit controls the "tripping" and "closing" operations of the circuit breaker and the isolating switch to reflect the working status of the primary and secondary equipment; the operating power supply system is composed of DC and AC power supply systems to provide working power for the above circuits. Through the coordinated work of these parts, the power meter cabinet can accurately measure the power usage and take protective measures when necessary to ensure the stability and safety of the power system.

[0004] In actual use, the secondary circuit of the metering cabinet needs to be inspected to ensure that it is in normal working condition. The secondary circuit of the metering cabinet is equipped with 2 voltage transformers and 2 current transformers, of which 4 transformers are installed in the incoming metering cabinet. During the maintenance work, the operator needs to remove the S1 side of the secondary winding of the current transformer and the voltage transformer, and check one by one with the multiple wires on the upper end of the junction box through the on-off range of the multimeter to ensure the correctness of the wiring of the secondary circuit of the metering. At the same time, in addition to the transformer, the incoming metering cabinet is also equipped with incoming knife switches and melting tube related equipment. When the grounding wire is installed, the space for staff to operate is relatively small, resulting in low operating efficiency of the operators. At the same time, the dismantling process is complicated, and the operators need to have professional skills to perform the operation, which has high professional requirements for personnel. Summary of the invention

[0005] In order to overcome the above-mentioned problems, the purpose of the present invention is to provide a rapid wire verification device for the secondary circuit of an incoming line meter cabinet and a method of using the same. The rapid wire verification device detects the secondary circuit in the incoming line meter cabinet through a handheld detector and a connecting wire assembly, thereby avoiding the removal of the secondary winding S1 side of the voltage transformer and the current transformer under the condition of a small space in the incoming line meter cabinet. The alligator clips and terminal blocks of the connecting wire assembly are directly used for connection. The operation is simple, the use is convenient, and the work efficiency is improved. The method of use clarifies the wiring process, provides convenience for the operation of the operator, and further improves the work efficiency.

[0006] The technical solution adopted by the present invention is:

[0007] The secondary circuit fast core wire device of the incoming meter cabinet comprises a handheld detector, an upper protective cover, a lower protective cover, and a connecting wire assembly. The upper protective cover and the lower protective cover are respectively mounted on the upper and lower ends of the handheld detector. The connecting wire assembly comprises a plurality of connecting wires, which are connected to the wiring terminals of the handheld detector for measurement;

[0008] The handheld detector is a shell structure, with a liquid crystal display fixedly installed on the top of the front of the shell, a button area at the bottom, a first wiring area at the top, a portable handle on the left side, and a second wiring area at the bottom of the right side. A circuit system is installed inside the shell, and the voltage input terminal, current input terminal, clamp current transformer interface, photoelectric and pulse signal interface of the circuit system are all located in the first wiring area, and the RS232 serial interface, charger interface, and USB interface of the circuit system are all located in the second wiring area.

[0009] As a further description of the present invention, one end of the multiple connecting wires of the connecting wire assembly is a wiring terminal, and the other end is an alligator clip.

[0010] As a further description of the present invention, the upper protective cover is provided with a rectangular hole having the same size as the first wiring area for exposing the wiring terminals in the first wiring area, and the upper protective cover and the lower protective cover are both made of silicone.

[0011] As a further description of the present invention, the second wiring area below the right side surface of the shell is recessed in design, and a protective plate is rotatably connected above the area.

[0012] As a further description of the present invention, the handheld device also includes a box, and the handheld detector and the connecting line assembly are placed in the box.

[0013] The method of using the secondary circuit fast wire verification device of the incoming meter cabinet for wiring verification includes wiring verification of three-phase four-wire low-voltage electric energy meter through clamp current transformer, direct wiring verification of three-phase four-wire low-voltage electric energy meter through internal current transformer, wiring verification of three-phase three-wire high-voltage electric energy meter through clamp current transformer, and direct wiring verification of three-phase three-wire high-voltage electric energy meter through internal current transformer, among which:

[0014] The method for verifying the connection of the three-phase four-wire low-voltage electric energy meter through a clamp-on current transformer comprises the following steps:

[0015] S101: Connect the connection terminals at the head end of the voltage line to the A, B, C, and N voltage terminals corresponding to the first connection area according to their colors;

[0016] S102: Connect the alligator clips at the ends of the voltage lines to the A, B, C, and N phase voltage lines at the end of the electric energy meter to be tested respectively;

[0017] S103: Connect the connection terminals of the clamp-on current transformer to the interfaces with corresponding labels according to the three phases A, B and C respectively;

[0018] S104: The current lines of the corresponding phases of the three phases A, B and C are clamped with corresponding clamp-on current transformers respectively;

[0019] The method for directly connecting and verifying the three-phase four-wire low-voltage electric energy meter via an internal current transformer comprises the following steps:

[0020] S201: Connect the connection terminals at the head end of the voltage line to the A, B, C, and N voltage terminals corresponding to the first connection area according to their colors;

[0021] S202: Connect the alligator clips at the end of the voltage line to the A, B, C, and N phase voltage lines at the end of the electric energy meter under test respectively;

[0022] S203: Connect the first-end connection terminal of the current line to the current terminal corresponding to the first connection area according to the color, the marked one is connected to the positive end of the current, and the unmarked one is connected to the negative end of the current;

[0023] S204: Connect the alligator clips at the end of the current wire to both sides of the terminal block, I+ to the side away from the meter, and I- to the side close to the meter;

[0024] S205: Open the connection piece of the terminal block;

[0025] The method for verifying the three-phase three-wire high-voltage electric energy meter through clamp-type current transformer connection comprises the following steps:

[0026] S301: Connect the yellow, green and red terminals at the head end of the voltage line to the corresponding A, B and C voltage terminals in the first wiring area respectively;

[0027] S302: Connect the yellow, green and red alligator clips at the end of the voltage line to the A, B and C three-phase voltage lines at the end of the electric energy meter to be tested according to their colors;

[0028] S303: Insert the clamp-on current transformers of phases A and C into the interfaces with corresponding labels;

[0029] S304: clamp the current line of the corresponding phase with a clamp-on current transformer;

[0030] The method for directly connecting and verifying the three-phase three-wire high-voltage electric energy meter via an internal current transformer comprises the following steps:

[0031] S401: Connect the yellow, green and red terminals at the head end of the voltage line to the corresponding A, B and C voltage terminals in the first wiring area respectively;

[0032] S402: Connect the yellow, green and red alligator clips at the end of the voltage line to the A, B and C three-phase voltage lines at the end of the electric energy meter under test according to their colors;

[0033] S403: Connect the two-phase connection terminals A and C at the head end of the current line to the current terminals corresponding to the first connection area according to their colors;

[0034] S404: Connect the alligator clips at the ends of the current wires to both sides of the terminal block, I+ to the side away from the meter, and I- to the side close to the meter;

[0035] S405: Then open the connecting piece of the terminal block.

[0036] As a further description of the present invention, the method is applicable to a single-phase wiring mode, and only requires connecting the voltage line and the current line to the voltage terminal and the current terminal of the same phase in the first wiring area.

[0037] Beneficial effects of the present invention:

[0038] The invention discloses a rapid wire checking device for the secondary circuit of an incoming line meter cabinet, comprising a handheld detector, an upper protective cover, a lower protective cover, and a connecting wire assembly. The upper protective cover and the lower protective cover are respectively mounted on the upper and lower ends of the handheld detector to prevent the handheld detector from falling during use and causing damage to the handheld detector, and to provide a certain buffering force. The connecting wire assembly is used in conjunction with the handheld detector, and one end of the multiple connecting wires of the connecting wire assembly is a wiring terminal, and the other end is an alligator clip. The secondary circuit in the incoming line meter cabinet is detected to avoid removal of the secondary winding S1 side of the voltage transformer and the current transformer in the condition of a small space in the incoming line meter cabinet. The alligator clip and the wiring terminal of the connecting wire assembly are directly used for connection, which is simple to operate, easy to use, and improves work efficiency.

[0039] The invention discloses a rapid line verification device for the secondary circuit of an incoming metering cabinet. The handheld detector is a shell structure. A liquid crystal display is fixedly mounted above the front of the shell. The detection result is directly observed through the liquid crystal display. The lower front of the shell is a key area for parameter setting and browsing of the detection result. A portable handle is arranged on the left side. The operator can carry the handheld detector for a short distance through the handle. A first wiring area is arranged on the top and a second wiring area is arranged below the right side. The handheld detector directly observes the detection result through the liquid crystal display, which is convenient and intuitive. At the same time, the key area is convenient for parameter adjustment.

[0040] The method for using the fast wire verification device for the secondary circuit of the incoming meter cabinet of the present invention clarifies the methods for wiring verification through clamp-on current transformers and direct wiring verification through internal current transformers in two situations: three-phase four-wire and three-phase three-wire, so that operators can understand the wiring process, provide convenience for the operation of operators, and further improve the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A front view of a handheld detector for the secondary circuit fast line verification device of the incoming line meter cabinet proposed by the present invention;

[0042] Figure 2 This is a schematic diagram of the structure of the second wiring area of ​​the secondary circuit fast core line device of the incoming metering cabinet proposed by the present invention;

[0043] Figure 3 This is a schematic structural diagram of the first wiring area of ​​the secondary circuit fast core line device of the incoming metering cabinet proposed by the present invention;

[0044] Figure 4 A schematic diagram of wiring a three-phase four-wire low-voltage electric energy meter through a clamp-on transformer in a method of using the secondary circuit fast core line device of an incoming meter cabinet proposed by the present invention;

[0045] Figure 5 A schematic diagram of the connection of a three-phase four-wire low-voltage electric energy meter through an internal current transformer in the method of using the secondary circuit fast core line device of the incoming meter cabinet proposed by the present invention;

[0046] Figure 6 A schematic diagram of the wiring of a three-phase three-wire high-voltage electric energy meter connected to a clamp meter in the method of using the secondary circuit fast core line device of the incoming meter cabinet proposed by the present invention;

[0047] Figure 7 A schematic diagram of the connection of a three-phase three-wire high-voltage electric energy meter through an internal current transformer in the method for using the secondary circuit fast core line device of the incoming meter cabinet proposed by the present invention;

[0048] Figure 8A three-phase three-wire metering principle diagram of the method for using the secondary circuit fast core line device of the incoming metering cabinet proposed by the present invention;

[0049] Fig. 9 The three-phase four-wire metering principle diagram is a method for using the secondary circuit fast core line device of the incoming line metering cabinet proposed by the present invention.

[0050] Fig.10 This is a startup interface diagram of the liquid crystal display of the secondary circuit fast line verification device of the incoming line meter cabinet proposed by the present invention.

[0051] Description of Reference Numerals

[0052] 1-Handheld detector,

[0053] 11- LCD display,

[0054] 12-button area,

[0055] 13-first wiring area, 131-voltage input terminal, 132-current input terminal, 133-clamp-on current transformer interface, 134-photoelectric and pulse signal interface,

[0056] 14-second wiring area, 141-RS232 serial interface, 142-charger interface, 143-USB interface, 144-protection board,

[0057] 2- Put on the protective cover,

[0058] 3- Lower protective cover. DETAILED DESCRIPTION

[0059] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and embodiments:

[0060] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0061] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0062] like Figures 1 to 10 As shown, it shows a specific embodiment of the present invention:

[0063] Embodiment 1

[0064] The secondary circuit rapid line verification device of the incoming metering cabinet includes a handheld detector 1, an upper protective cover 2, a lower protective cover 3, and a connecting wire assembly. The upper protective cover 2 and the lower protective cover 3 are respectively mounted on the upper and lower ends of the handheld detector 1. The connecting wire assembly includes multiple connecting wires, which are connected to the wiring terminals of the handheld detector 1 for measurement.

[0065] Specifically, one end of the multiple connecting wires of the connecting wire assembly is a wiring terminal, and the other end is an alligator clip.

[0066] In this embodiment, Figure 1 As shown, the upper protective cover 2 and the lower protective cover 3 are respectively mounted on the upper and lower ends of the handheld detector 1 to prevent the handheld detector 1 from falling and causing damage to the handheld detector 1 during use, and to provide a certain buffer force. The connecting wire assembly is used in conjunction with the handheld detector 1. One end of the multiple connecting wires of the connecting wire assembly is a terminal block, and the other end is an alligator clip. The secondary circuit in the incoming metering cabinet is detected to avoid the removal of the secondary winding S1 side of the voltage transformer and the current transformer in the small space of the incoming metering cabinet. The alligator clips and the terminal blocks of the connecting wire assembly are directly used for connection, which is simple to operate and easy to use, thereby improving work efficiency.

[0067] The handheld detector 1 is a shell structure, with a liquid crystal display 11 fixedly installed on the upper front of the shell, a button area 12 at the lower part, a first wiring area 13 at the top, a portable handle on the left side, and a second wiring area 14 at the lower part of the right side. A circuit system is installed inside the shell, and the voltage input terminal 131, current input terminal 132, clamp current transformer interface 133, photoelectric and pulse signal interface 134 of the circuit system are all located in the first wiring area 13, and the RS232 serial interface 141, charger interface 142, and USB interface 143 of the circuit system are all located in the second wiring area 14.

[0068] In this embodiment, Figure 1As shown, the handheld detector 1 is a shell structure, and the shell structure adopts an engineering plastic shell manufactured by open mold. The handheld detector 1 has beautiful appearance, is convenient and practical to hold, and a liquid crystal display 11 is fixedly installed on the upper front of the shell. The test results are directly observed through the liquid crystal display 11. The button area 12 is located below the front of the shell for parameter setting and browsing of test results. A portable handle is arranged on the left side, and the portable handle can be designed as a fastening belt structure, which is suitable for different operators. At the same time, the operator can carry the handheld detector for a short distance through the handle to realize handheld operation. A first wiring area 13 is arranged on the top, and a second wiring area 14 is arranged at the lower right side. The handheld detector 1 directly observes the test results through the liquid crystal display 11, which is convenient and intuitive. At the same time, the button area 12 is convenient for parameter adjustment.

[0069] In this embodiment, Figure 3 As shown, the voltage input terminal 131 of the circuit system specifically includes: UA, UB, UC, UN; the current input terminal 132 specifically includes Ia+, Ia-, Ib+, Ib-, Ic+, Ic-, wherein Ia+, Ib+, Ic+ are current inflow terminals, and Ia-, Ib-, Ic- are current outflow terminals; the clamp-type current transformer interface 133 specifically includes A-phase clamp, B-phase clamp, and C-phase clamp.

[0070] In this embodiment, the pulse signal used when using the photoelectric and pulse signal interface 134 of the first wiring area 13 can be obtained in three ways, namely, a photoelectric sampler, a manual switch, and a dedicated pulse test line; different types of electric energy meters can be tested in different ways.

[0071] First, for mechanical watt-hour meters, pulses can be automatically acquired through a photoelectric sampler; pulses can also be acquired manually through a manual switch;

[0072] Secondly, for electronic electric energy meters, pulses can be automatically acquired through a photoelectric sampler; pulses can also be automatically acquired through a dedicated pulse test line.

[0073] In this embodiment, the LCD display 11 has a main menu and twelve function interfaces, such as Fig.10 As shown, where:

[0074] After powering on, the top line of the LCD display 11 screen displays status parameters, including: program version number, voltage level, current input mode, date and time, and battery remaining power. The user can determine whether the instrument needs to be charged based on the value of the battery remaining power.

[0075] The middle of the LCD screen 11 is the function menu option, which has twelve items in total, including: parameter setting, electrical test, meter calibration, walking test, vector analysis, ratio test, test_485, waveform display, spectrum analysis, harmonic test, historical data, system calibration. Use the ↑, ↓, ←, → keys to select, and press the OK key to enter the corresponding function interface.

[0076] Below the screen of the liquid crystal display 11 is a prompt bar, which provides simple operation prompts for the user to facilitate correct operation.

[0077] Specifically, the upper protective cover 2 is provided with a rectangular hole having the same size as the first wiring area 13 for exposing the wiring terminals in the first wiring area 13 . The upper protective cover 2 and the lower protective cover 3 are both made of silicone.

[0078] In this embodiment, a rectangular hole of the first wiring area 13 is opened on the upper protective cover 2. The upper protective cover 2 can expose the wiring terminals of the first wiring area 13 while providing protection for the handheld detector 1, without affecting the use of the handheld detector 1.

[0079] In this embodiment, the upper protective cover 2 and the lower protective cover 3 are both made of silicone, which can provide a stable buffering force to ensure the safety of the handheld detector 1 during use.

[0080] Specifically, the second wiring area 14 at the lower right side surface of the shell is of a recessed design, and a protective plate 144 is rotatably connected above the area.

[0081] In this embodiment, Figure 2 As shown, a connection protection plate 144 is rotated above the second wiring area 14. When the handheld detector 1 needs to be operated, the protection plate 144 is opened to expose the second wiring area 14 for connecting related connecting wires. After use, the protection plate 144 is rotated to close the second wiring area 14 to ensure that the terminals in the second wiring area 14 are not damaged, thereby increasing the service life of the handheld detector 1.

[0082] In this embodiment, the protection plate 144 extends to the back structure of the entire handheld detector 1. During use, the protection plate 144 can be opened and used as a bracket to free hands and facilitate observation of measurement results on the LCD display 11 interface.

[0083] In this embodiment, the terminals of the second wiring area 1 are used as follows: the RS232 serial interface 141 is used to upload the saved data to the computer; the charger interface 142 is used for charging and battery life of the handheld detector 1; the USB interface 143 is connected to the computer via a dedicated data cable, and the memory card in the instrument is used as a large-capacity storage device.

[0084] Specifically, the handheld device further includes a box, and the handheld detector 1 and the connecting line assembly are placed in the box.

[0085] In this embodiment, the handheld detector 1 and the connecting line assembly are housed in a box, which is convenient for operators to carry and enables maintenance work to be carried out in an orderly manner.

[0086] Embodiment 2

[0087] The method of using the secondary circuit quick wire verification device of the incoming meter cabinet for wiring verification specifically includes wiring verification of three-phase four-wire low-voltage electric energy meters via clamp-type current transformers, wiring verification of three-phase four-wire low-voltage electric energy meters via internal current transformers, wiring verification of three-phase three-wire high-voltage electric energy meters via clamp-type current transformers, and wiring verification of three-phase three-wire high-voltage electric energy meters via internal current transformers.

[0088] In this embodiment, the methods of wiring verification through clamp-on current transformers and direct wiring verification through internal current transformers in the three-phase four-wire and three-phase three-wire situations are clarified, so that the operating personnel can understand the wiring process, provide convenience for the operating personnel's operation, and further improve the operating efficiency.

[0089] In this embodiment, when the measurement accuracy is required to be high, the measurement is performed via an internal mutual inductor.

[0090] In this embodiment, the method is based on the measurement principle of three-phase three-wire and three-phase four-wire, wherein:

[0091] Three-phase three-wire measurement refers to the use of two power elements to measure the three-phase line, which is equivalent to connecting two ammeters (connected in series to phases A and C), two voltmeters (connected in parallel between AB and CB respectively) and two power meters (current coils connected in series to phases A and C, and voltage coils connected in parallel between AB and CB) in the circuit. The principle is as follows: Figure 8 shown.

[0092] Three-phase four-wire measurement refers to the use of three power elements to measure the three-phase line, which is equivalent to connecting three ammeters (connected in series to the A, B, and C phases), three voltmeters (connected in parallel between the A, B, and C phases) and three power meters (current coils are connected in series to the A, B, and C phases, and voltage coils are connected in parallel between the A, B, and C phases). The measurement principle is as follows: Fig. 9 shown.

[0093] Embodiment 3

[0094] The method for verifying the connection of the three-phase four-wire low-voltage electric energy meter through a clamp-on current transformer comprises the following steps:

[0095] S101: Connect the connection terminals at the head end of the voltage line to the A, B, C, and N voltage terminals corresponding to the first connection area according to their colors;

[0096] S102: Connect the alligator clips at the ends of the voltage lines to the A, B, C, and N phase voltage lines at the end of the electric energy meter to be tested respectively;

[0097] S103: Connect the connection terminals of the clamp-on current transformer to the interfaces with corresponding labels according to the three phases A, B and C respectively;

[0098] S104: The three phases A, B, and C use corresponding clamp-on current transformers to clamp the current lines of the corresponding phases.

[0099] In this embodiment, Figure 4 As shown, in step S104, a clamp current transformer is used to clamp the current line of the corresponding phase, so that attention needs to be paid to the polarity to ensure that the polarity connection is correct, wherein the side of the clamp current transformer marked with A, B, and C is the current inflow end, and the side marked with N is the current outflow end.

[0100] Embodiment 4

[0101] like Figure 5 As shown, the method for directly connecting and verifying the three-phase four-wire low-voltage electric energy meter through the internal current transformer comprises the following steps:

[0102] S201: Connect the connection terminals at the head end of the voltage line to the A, B, C, and N voltage terminals corresponding to the first connection area according to their colors;

[0103] S202: Connect the alligator clips at the end of the voltage line to the A, B, C, and N phase voltage lines at the end of the electric energy meter under test respectively;

[0104] S203: Connect the first-end connection terminal of the current line to the current terminal corresponding to the first connection area according to the color, the marked one is connected to the positive end of the current, and the unmarked one is connected to the negative end of the current;

[0105] S204: Connect the alligator clips at the end of the current wire to both sides of the terminal block, I+ to the side away from the meter, and I- to the side close to the meter;

[0106] S205: Open the connection piece of the terminal block.

[0107] Embodiment 5

[0108] like Figure 6 As shown, the method for verifying the three-phase three-wire high-voltage electric energy meter through clamp current transformer connection includes the following steps:

[0109] S301: Connect the yellow, green and red connection terminals at the head end of the voltage line to the A, B and C voltage terminals corresponding to the first connection area respectively, that is, the yellow plug is connected to the voltage terminal UA, the green plug is connected to the voltage terminal UB, the red plug is connected to the voltage terminal UC, and the UN terminal is not connected;

[0110] S302: Connect the yellow, green and red alligator clips at the end of the voltage line to the A, B and C three-phase voltage lines at the end of the electric energy meter to be tested according to their colors;

[0111] S303: Insert the clamp-on current transformers of phases A and C into the interfaces with corresponding labels;

[0112] S304: clamp the current line of the corresponding phase with a clamp-on current transformer;

[0113] In this embodiment, Figure 6 As shown, in step S304, a clamp current transformer is used to clamp the current line of the corresponding phase, so that attention needs to be paid to the polarity to ensure that the polarity connection is correct, wherein the side of the clamp current transformer marked with A, B, and C is the current inflow end, and the side marked with N is the current outflow end.

[0114] Embodiment 6

[0115] like Figure 7 As shown, the method for directly connecting and verifying the three-phase three-wire high-voltage electric energy meter through internal current transformers includes the following steps:

[0116] S401: Connect the yellow, green and red terminals at the head end of the voltage line to the A, B and C voltage terminals corresponding to the first wiring area respectively; that is, the yellow plug is connected to the voltage terminal UA, the green plug is connected to the voltage terminal UB, the red plug is connected to the voltage terminal UC, and the UN terminal is not connected.

[0117] S402: Connect the yellow, green and red alligator clips at the end of the voltage line to the A, B and C three-phase voltage lines at the end of the electric energy meter under test according to their colors;

[0118] S403: Connect the A and C phase connection terminals at the head end of the current line to the current terminals corresponding to the first connection area according to their colors; the B phase line is not used, the one with polarity end mark is connected to the positive current terminal, and the one without mark is connected to the negative current terminal,

[0119] S404: Connect the alligator clips at the ends of the current wires to both sides of the terminal block, I+ to the side away from the meter, and I- to the side close to the meter;

[0120] S405: Then open the connecting piece of the terminal block.

[0121] Embodiment 7

[0122] Specifically, the method is applicable to a single-phase wiring mode, and only requires connecting the voltage line and the current line to the voltage terminal and the current terminal of the same phase in the first wiring area.

[0123] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

[0124] Many other changes and modifications may be made without departing from the concept and scope of the present invention.It should be understood that the present invention is not limited to the specific embodiments, and the scope of the present invention is defined by the appended claims.

Claims

1. The secondary circuit fast core line device of the incoming metering cabinet is characterized by: The handheld detector comprises a handheld detector (1), an upper protective cover (2), a lower protective cover (3), and a connecting wire assembly, wherein the upper protective cover (2) and the lower protective cover (3) are respectively mounted on the upper and lower ends of the handheld detector (1), and the connecting wire assembly comprises a plurality of connecting wires, which are connected to the connecting terminals of the handheld detector (1) for measurement; The handheld detector (1) is a shell structure, with a liquid crystal display (11) fixedly mounted on the upper front of the shell, a keypad area (12) at the lower part, a first wiring area (13) arranged at the top, a portable handle arranged on the left side, and a second wiring area (14) arranged at the lower part of the right side. A circuit system is installed inside the shell, wherein the voltage input terminal (131), the current input terminal (132), the clamp current transformer interface (133), and the photoelectric and pulse signal interface (134) of the circuit system are all located in the first wiring area (13), and the RS232 serial interface (141), the charger interface (142), and the USB interface (143) of the circuit system are all located in the second wiring area (14).

2. The secondary circuit fast core line device of the incoming line meter cabinet according to claim 1 is characterized in that: One end of the multiple connecting wires of the connecting wire assembly is a connecting terminal, and the other end is an alligator clip.

3. The secondary circuit fast core line device of the incoming line meter cabinet according to claim 1 is characterized in that: The upper protective cover (2) is provided with a rectangular hole of the same size as the first wiring area (13) for exposing the wiring terminals of the first wiring area (13); the upper protective cover (2) and the lower protective cover (3) are both made of silicone.

4. The secondary circuit fast core line device of the incoming line meter cabinet according to claim 1 is characterized in that: The second wiring area (14) below the right side surface of the shell is of recessed design, and a protection plate (144) is rotatably connected above the area.

5. The secondary circuit fast core line device of the incoming line meter cabinet according to claim 1 is characterized in that: The handheld device also includes a box, and the handheld detector (1) and the connecting line assembly are placed in the box.

6. A method for using the secondary circuit fast wire verification device of the incoming line meter cabinet according to any one of claims 1 to 5 to perform wiring verification, characterized in that: Including three-phase four-wire low-voltage energy meter through clamp current transformer wiring verification, three-phase four-wire low-voltage energy meter through internal current transformer direct wiring verification, three-phase three-wire high-voltage energy meter through clamp current transformer wiring verification, three-phase three-wire high-voltage energy meter through internal current transformer direct wiring verification, including: The method for verifying the connection of the three-phase four-wire low-voltage electric energy meter through a clamp-on current transformer comprises the following steps: S101: Connect the connection terminals at the head end of the voltage line to the A, B, C, and N voltage terminals corresponding to the first connection area according to their colors; S102: Connect the alligator clips at the ends of the voltage lines to the A, B, C, and N phase voltage lines at the end of the electric energy meter to be tested respectively; S103: Connect the connection terminals of the clamp-on current transformer to the interfaces with corresponding labels according to the three phases A, B and C respectively; S104: The current lines of the corresponding phases of the three phases A, B and C are clamped with corresponding clamp-on current transformers respectively; The method for directly connecting and verifying the three-phase four-wire low-voltage electric energy meter via an internal current transformer comprises the following steps: S201: Connect the connection terminals at the head end of the voltage line to the A, B, C, and N voltage terminals corresponding to the first connection area according to their colors; S202: Connect the alligator clips at the end of the voltage line to the A, B, C, and N phase voltage lines at the end of the electric energy meter under test respectively; S203: Connect the first-end connection terminal of the current line to the current terminal corresponding to the first connection area according to the color, the marked one is connected to the positive end of the current, and the unmarked one is connected to the negative end of the current; S204: Connect the alligator clips at the end of the current wire to both sides of the terminal block, I+ to the side away from the meter, and I- to the side close to the meter; S205: Open the connection piece of the terminal block; The method for verifying the three-phase three-wire high-voltage electric energy meter through clamp-type current transformer connection comprises the following steps: S301: Connect the yellow, green and red terminals at the head end of the voltage line to the corresponding A, B and C voltage terminals in the first wiring area respectively; S302: Connect the yellow, green and red alligator clips at the end of the voltage line to the A, B and C three-phase voltage lines at the end of the electric energy meter to be tested according to their colors; S303: Insert the clamp-on current transformers of phases A and C into the interfaces with corresponding labels; S304: clamp the current line of the corresponding phase with a clamp-on current transformer; The method for directly connecting and verifying the three-phase three-wire high-voltage electric energy meter via an internal current transformer comprises the following steps: S401: Connect the yellow, green and red terminals at the head end of the voltage line to the corresponding A, B and C voltage terminals in the first wiring area respectively; S402: Connect the yellow, green and red alligator clips at the end of the voltage line to the A, B and C three-phase voltage lines at the end of the electric energy meter under test according to their colors; S403: Connect the two-phase connection terminals A and C at the head end of the current line to the current terminals corresponding to the first connection area according to their colors; S404: Connect the alligator clips at the ends of the current wires to both sides of the terminal block, I+ to the side away from the meter, and I- to the side close to the meter; S405: Then open the connecting piece of the terminal block.

7. The method for using the secondary circuit fast wire verification device of the incoming line meter cabinet according to claim 6 for wiring verification is characterized in that: The method is applicable to a single-phase wiring mode, and only requires connecting the voltage line and the current line to the voltage terminal and the current terminal of the same phase in the first wiring area.

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