Rapid wiring method for verification of combined mutual inductor

Abstract

The invention provides a rapid wiring method for verification of a combined mutual inductor, belongs to the technical field of mutual inductor verification, mainly solves the problem of low wiring efficiency during verification in the prior art, and comprises the steps of designing and manufacturing a mobile wiring panel, a contact unit, a power unit and an operation process, and mainly comprises the steps of designing and manufacturing the mobile wiring panel; designing and manufacturing a contact unit, firstly fixing a probe, and then reinforcing the probe; a power unit is designed and manufactured, four electric screwdrivers are fixed on a movable wiring panel, and forward and reverse rotation of electric screwdriver heads is controlled by an inching switch; the electric bit is embedded into the cross-shaped groove of the positioning plate for fixing the screw, and the screw penetrates through the through holes in the four corners of the positioning plate; according to the type of a tested object, a corresponding mobile wiring panel wiring terminal is selected to be correspondingly connected with the calibrating device; the fixing screw of the positioning plate is aligned with the fixing screw hole of the wiring terminal box cover of the tested object, and the electric screw driver is started to screw the screw, so that the elastic probe is tightly contacted with the corresponding wiring terminal of the tested object for verification.

Description

Technical Field

[0001] This invention belongs to the field of instrument transformer calibration technology, specifically relating to a quick wiring method for calibrating combined instrument transformers. Background Technology

[0002] The State Grid's technical specifications for 10kV metering transformers have been promulgated, standardizing the size, appearance, and structure of 10kV metering combined transformers. In particular, the standardized layout and dimensions of the terminals provide a material basis for quick wiring. The terminals for combined transformers are divided into two types: one for three-element combined transformers and the other for two-element combined transformers. One type uses only two sets of current elements and two sets of voltage elements, based on the principle that "in a symmetrical three-phase circuit, the sum of the power of the two elements equals the total power" (applicable to three-phase three-wire systems); the other type uses three sets of current elements and three sets of voltage elements to collect the current and voltage of phases A, B, and C respectively, directly calculating the total power (applicable to all three-phase circuits). The design of these two types of wiring fixtures can significantly improve verification efficiency. Summary of the Invention

[0003] The purpose of this invention is to solve the problems existing in the prior art and provide a quick wiring method for calibrating combined current transformers.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: The quick wiring method for calibrating combined current transformers includes the design and fabrication of a movable wiring panel, contact unit, power unit, and operating procedure, as detailed below: The first step is to design and manufacture the mobile wiring panel, including designing the circuit board, designing the insulation board, fixing the insulation board to the circuit board, drilling holes and fixing the wiring terminals. The second step is to design and fabricate the contact unit. First, fix the probes by securing the spring probes to the insulating plate with probe fixing screws. There are two layout options: a three-element combined current transformer and a two-element combined current transformer. Based on the layout of the terminals of the three-element combined current transformer under test, fix the probes to the insulating plate. Then, based on the layout of the terminals of the two-element combined current transformer under test, fix the probes to another insulating plate, forming two wiring panels with fixed probes. Connect the terminals, probes, and corresponding nodes on the circuit board. To reinforce the probe, a positioning plate is installed in the middle section of the probe and fixed to the insulating plate by several positioning plate fixing rods. Through holes corresponding to the probe positions are made on the positioning plate, and the positioning plate is fitted onto the probe. The third step is to design and manufacture the power unit, fix four electric screwdrivers on the movable wiring panel, and make the layout of the four electric screwdriver bits consistent with the fixing screw holes of the terminal box cover of the test object; the electric screwdrivers are powered by rechargeable batteries; the rechargeable batteries are placed in the rechargeable battery box, the electric screwdrivers are connected to the corresponding nodes of the circuit board, and the rechargeable batteries are connected to the electric screwdrivers through wire channels; the forward and reverse rotation of the electric screwdriver bits is controlled by a jog button. The electric screwdriver bit is embedded in the cross groove of the positioning plate fixing screw, and the screw is inserted into the through holes at the four corners of the positioning plate. The fourth step is to select the appropriate mobile wiring panel terminals and connect them to the calibration device according to the type of test sample. Fifth step: Hold the movable wiring panel and align the positioning plate fixing screws with the fixing screw holes of the terminal box cover of the test sample. Step 6: Activate the jog switch to ensure the probe makes tight contact with the terminals of the test sample. The travel is limited by the limit switch to prevent damage to the test sample. Step 7: Start the calibration device to perform the calibration.

[0005] Compared with the prior art, the present invention has the following advantages: This invention designs and manufactures a movable wiring panel, a contact unit, and a power unit. Several elastic probes of the contact unit make effective contact with the wiring terminals of the combined current transformer simultaneously, which greatly reduces the wiring time of several wiring terminals, making it suitable for batch verification and significantly improving verification efficiency. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Left view of the structure shown; Figure 3 for Figure 1 Top view of the structure shown; Figure 4 This is a three-dimensional schematic diagram of the structure of the present invention; Figure 5 This is a schematic diagram of the probe structure of the present invention; Figure 6 for Figure 5 Cross-sectional view of the structure shown; Figure 7 for Figure 1 A bottom view of the structure shown; Figure 8 A schematic diagram of the wiring panel for the three components of the test sample; Figure 9 This is a schematic diagram of the wiring panel for the two components of the test sample.

[0007] In the diagram: 1—Electric screwdriver; 1-1—Electric screwdriver bit; 2—Wiring panel; 2-1—Terminal; 2-2—Circuit board; 2-3—Insulating board; 2-4—Entry jog switch; 2-5—Exit jog switch; 3—Rechargeable battery box; 4—Positioning plate; 4-1—Positioning plate fixing rod; 5—Elastic probe; 5-1—Pin bar; 5-11—Spring; 5-2—Pin tip; 5-3—Probe fixing screw; 6—Limit switch; 6-1—Limit switch protective plate; 7—Positioning plate fixing screw; 8—Terminal of the tested three-element combined current transformer; 8-1—Fixing screw hole for the three-element terminal box cover; 9—Terminal of the tested two-element combined current transformer; 9-1—Fixing screw hole for the two-element terminal box cover; 10—Terminal of the test object. Detailed Implementation

[0008] A quick wiring method for calibrating a combined current transformer includes the design and fabrication of a movable wiring panel, a contact unit, a power unit, and an operation procedure, as detailed below: The first step is to design and manufacture a portable wiring panel, such as... Figure 1 , 2 As shown, the design includes circuit board 2-2, insulating board 2-3, fixing insulating board 2-3 to circuit board 2-2, and drilling and fixing terminal 2-1. The second step is to design and fabricate the contact unit, which includes several elastic probes 5. First, the elastic probes 5 are fixed, as shown below... Figure 1 , 2 As shown in Figures 5 and 6, the elastic probe 5 is fixed to the insulating plate 2-3 by the probe fixing screw 5-3. There are two layout configurations: a three-element combined current transformer terminal configuration and a two-element combined current transformer terminal configuration. Figure 8 , 9 As shown, based on the layout of the terminals of the three-element combined transformer under test, the probe is fixed on the insulating board. Then, based on the layout of the terminals of the two-element combined transformer under test, the probe is fixed on another insulating board, forming two wiring panels 2 with elastic probes fixed on them. The terminals 2-1 and elastic probes 5 are connected to the corresponding nodes of the circuit board 2-2. To reinforce the probe, a positioning plate 4 is added to the middle section of the probe, such as... Figure 1 , 7 As shown, through holes corresponding to the positions of the elastic probe 5 are made on the positioning plate 4, and the positioning plate is fitted onto the elastic probe 5; it is fixed to the insulating plate 2-3 by several positioning plate fixing rods 4-1. The third step is to design and manufacture the power unit, such as... Figure 1As shown, four electric screwdrivers 1 are fixed on the movable wiring panel 2, and the layout of the four electric screwdriver bits 1-1 is consistent with the fixing screw holes of the terminal box cover of the test object; the power supply of the electric screwdrivers is provided by rechargeable batteries; the rechargeable batteries are placed in the rechargeable battery box 3, which is symmetrically fixed at both ends of the insulating plate 2-3, and the power supply line of the electric screwdrivers 1 is connected to the rechargeable batteries through the wire groove; the forward and reverse rotation of the electric screwdriver bits 1-1 is controlled by a momentary switch; the momentary switch includes an entry momentary switch 2-4 and an exit momentary switch 2-5; a limit switch 6 is provided on the positioning plate 4, and the limit switch line is connected to the power supply circuit of the electric screwdrivers 1 through the wire groove; The electric screwdriver bit 1-1 is embedded in the cross groove of the positioning plate fixing screw 7, and the screw is inserted into the through holes at the four corners of the positioning plate. Fourth step: Select the appropriate movable wiring panel 2 according to the type of test sample, and connect the wiring terminal 2-1 to the corresponding test device; Fifth step, hold the movable wiring panel 2 and align the positioning plate fixing screw 7 with the fixing screw hole of the terminal box cover of the test sample; Step 6: Activate the jog switch 2-4 to make the elastic probe 5 make tight contact with the terminal of the test sample. The stroke is limited by the limit switch 6 to prevent damage to the test sample. Step 7: Start the calibration device to perform the calibration; Step 8: After the verification is completed, activate the exit jog switch 2-5 to disconnect the terminal block 2-1 from the test sample.

[0009] like Figure 1 , 2 As shown in Figures 3 and 4, the convenient wiring device for calibrating combined current transformers includes a wiring panel, a power unit, a motion unit, a contact unit, and a power supply unit. Its characteristic is that the wiring panel 2 includes a circuit board 2-2, wiring terminals 2-1, an insulating plate 2-3, a jog entry switch 2-4, and a jog exit switch 2-5. The circuit board 2-2 is fixedly connected to the insulating plate 2-3. Figure 8 , 9 As shown, the number and layout of the terminals 2-1 include two forms: a 3-element combined current transformer and a 2-element combined current transformer. The terminal block 2-1 is fixed on the insulating plate 2-3 and connected to the corresponding node on the circuit board 2-2; The power unit includes four electric actuators 1; The motion unit includes an electric screwdriver bit 1-1 and a positioning plate fixing screw 7; The contact unit includes a plurality of probes 5; The power supply unit includes two rechargeable battery boxes 3; The terminal block 2-1 and probe 5 are connected to the corresponding nodes of circuit board 2-2; the limit switch 6 is connected to the control circuit of electric screwdriver 1 through wire groove; The crosshead of the electric screwdriver bit 1-1 is fitted into the groove of the crosshead of the positioning plate fixing screw 7. The positioning plate fixing screw 7 passes through the through hole provided on the positioning plate 4 and connects to the fixing screw hole of the terminal box cover corresponding to the test sample during operation. like Figure 1 , 7 As shown, the positioning plate 4 is fixed to the insulating plate 2-3 by a plurality of positioning plate fixing rods 4-1; a limit switch 6 is provided on the positioning plate 4 near the positioning plate fixing screw 7; the positioning plate 4 has a through hole corresponding to the position of the probe 5, the positioning plate is sleeved on the probe 5, and the positioning plate 4 is located in the middle section of the probe. A limit switch protective plate 6-1 is installed on the positioning plate; like Figure 5 , 6 As shown, the probe 5 includes a needle bar 5-1, a spring 5-11, a needle tip 5-2, and a probe fixing screw 5-3. The probe 5 is fixed to the wiring panel 2 by the probe fixing screw 5-3. The terminal block 2-1 is connected to the calibration device via a wire; the rechargeable battery box 3 can be used as a handle for calibration operations.

[0010] Working principle and process: This invention can be used in two ways; 1. Verification of 3-element combined current transformer The convenient wiring device for calibrating the three-element combined current transformer of the present invention is selected. Hold the charging battery box 3 at both ends of the wiring panel 2 with both hands, and keep the jog-in switch 2-4 and jog-out switch 2-5 away from the operator. The operator holds the present invention as follows: Figure 8 As shown, align the positioning plate fixing screws 7 with the fixing screw holes 8-1 of the three-element terminal box cover of the test sample. Press the jog switch 2-4 with your thumb. At this time, all four positioning plate fixing screws 7 are simultaneously screwed into the fixing screw holes 8-1 of the three-element terminal box cover. When the operating arm of the limit switch 6 reaches the limit position, the electric screwdriver 1 stops, the probe 5 makes tight contact with the terminal 10 of the test sample, the wiring operator retreats to a safe area, and the verification personnel operate the verification device to verify the test sample. After verification, the operator presses the exit jog switch 2-5, the invention is disengaged from the test sample, and preparation is made for the verification of the next test sample.

[0011] 2. Verification of 2-element combined current transformer The convenient wiring device for calibrating a 2-element combined current transformer according to the present invention operates similarly to that for calibrating a 3-element combined current transformer. The differences are as follows: Figure 9As shown, the four positioning plate fixing screws 7 are simultaneously screwed into the fixing screw holes 9-1 of the terminal box cover of the 2-element combined transformer.

Claims

1. A quick wiring method for calibrating a combined current transformer, characterized in that: This includes the design and fabrication of the mobile wiring panel, contact unit, power unit, and operating procedures, as detailed below: The first step is to design and manufacture a movable wiring panel (2), including designing a circuit board (2-2), designing an insulating board (2-3), fixing the insulating board (2-3) to the circuit board (2-2), and drilling and fixing the wiring terminals (2-1). The second step is to design and manufacture a contact unit, which includes several elastic probes (5). First, fix the elastic probes (5) by fixing them on the insulating plate (2-3) with probe fixing screws (5-3). The number and layout are divided into two types: three-element combined current transformer terminal form and two-element combined current transformer terminal form. According to the layout of the terminal of the three-element combined current transformer under test, fix the elastic probes (5) on the insulating plate (2-3). Then, according to the layout of the terminal of the two-element combined current transformer under test, fix the elastic probes (5) on another insulating plate (2-3) to form two wiring panels (2) with elastic probes (5) fixed on them. Connect the corresponding nodes of the terminal (2-1), elastic probes (5) and circuit board (2-2). To reinforce the probe, a positioning plate (4) is installed in the middle section of the probe. A through hole corresponding to the position of the elastic probe (5) is opened on the positioning plate (4). The positioning plate (4) is fitted onto the elastic probe (5). It is then fixed to the insulating plate (2-3) by several positioning plate fixing rods (4-1). The third step is to design and manufacture the power unit. Four electric screwdrivers (1) are fixed on the movable wiring panel (2), and the layout of the four electric screwdriver bits (1-1) is consistent with the screw holes of the terminal box cover of the test sample. The power supply of the electric screwdrivers (1) is provided by the rechargeable battery. The rechargeable battery is placed in the rechargeable battery box (3), which is symmetrically fixed at both ends of the insulating plate (2-3). The power supply line of the electric screwdrivers (1) is connected to the rechargeable battery through the wire groove. The forward and reverse rotation of the electric screwdriver bits (1-1) is controlled by the jog switch. The jog switch includes an entry jog switch (2-4) and an exit jog switch (2-5). A limit switch (6) is set on the positioning plate (4), and the limit switch line is connected to the power supply circuit of the electric screwdrivers (1) through the wire groove. The electric screwdriver bit (1-1) is embedded in the cross groove of the positioning plate fixing screw (7) and the screw is inserted into the through holes at the four corners of the positioning plate; Fourth step: Select the appropriate movable wiring panel (2) according to the type of test sample, and connect the wiring terminals (2-1) to the corresponding test device; Fifth step, hold the movable wiring panel (2) and align the positioning plate fixing screw (7) with the fixing screw hole of the terminal box cover of the test sample; Step 6: Activate the jog switch (2-4) to make the elastic probe (5) make tight contact with the terminal of the test sample. The stroke is limited by the limit switch (6) to prevent damage to the test sample. The wiring operator evacuates to a safe area. Step 7: Start the calibration device to perform the calibration; Step 8: After the verification is completed, activate the exit jog switch (2-5) to disconnect the terminal block (2-1) from the test sample.

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