Electrical cabinet safe in operation
The fixed connection between the inverted tapered through-hole and the guide copper busbar and the current monitoring device solves the problems of loose wiring and asymmetric current in traditional electrical cabinets, and achieves reliable connection and safe operation of the electrical cabinet in a vibration environment.
Patent Information
- Application Number
- CN202510789530.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2025-09-05
AI Technical Summary
The copper busbar wiring method in traditional electrical cabinets leads to high inventory management costs and high manufacturing costs. Loose wiring can easily cause safety hazards, and the asymmetric reverse current component affects equipment safety.
The inverted tapered through-hole is combined with the guide copper busbar, and the wire is fixed with the tapered mouth and nut to ensure a reliable connection; the current transformer and calculation controller are combined to monitor the asymmetric current and automatically cut off the power supply.
It improves the reliability of electrical connections, eliminates false connections or poor contacts, reduces the risk of equipment loosening due to vibration, ensures the safe operation of electrical cabinets in vibrating environments, and monitors asymmetric currents in real time to prevent false tripping.
Smart Images
Figure CN120601266A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of electrical cabinets, and in particular relates to an electrical cabinet with safe operation. Background Art
[0002] Electrical cabinets are core equipment for power transmission and control, and the wiring method of their internal copper busbars directly affects the efficiency and safety of power transmission. Traditional electrical cabinets use fixed-type terminal blocks for copper busbar wiring, and electrical cabinets with different maximum conduction current requirements require different terminal blocks.
[0003] This design leads to the following problems: Companies need to purchase multiple terminal block models, which takes up inventory space and increases management costs. Different terminal block models require separate molds and production equipment, driving up manufacturing costs. In three-phase electrical cabinets, since all wiring and power flow through the input lines, the amount of electricity required is high and requires a strong and reliable connection. However, the existing terminal crimping method is susceptible to loosening due to vibration, potentially causing the connection strength to gradually decrease, resulting in sparks during operation and posing a safety hazard to the equipment.
[0004] At the same time, when electrical cabinets are used for large equipment that is frequently started and shut down, it is easy to generate asymmetric reverse components of current. Long-term operation of the reverse components of asymmetric current will have adverse effects on the equipment and the power grid and needs to be removed. However, due to changes caused by equipment startup or temporary changes, such as immediate tripping when collecting data, it is easy to cause misoperation. Summary of the Invention
[0005] To address the shortcomings of the existing technology, the present invention provides an electrical cabinet with safe operation. The inverted conical cavity at the upper portion of the through hole squeezes the tapered opening, creating a greater extrusion force between the core wires passing through the tapered opening and the guide copper busbar, ensuring reliable electrical connection performance and preventing false connections or poor contact.
[0006] The technical solution of the present invention is: an electrical cabinet with safe operation, including an A-phase terminal block, a B-phase terminal block, a C-phase terminal block, an N-direction terminal block and a control device, wherein the A-phase terminal block, the B-phase terminal block, the C-phase terminal block and the N-direction terminal block are fixed on the electrical cabinet, characterized in that the A-phase terminal block, the B-phase terminal block, the C-phase terminal block and the N-direction terminal block have the same structure, including an insulating seat, a guide copper bar, a through hole and an inverted cone connecting terminal, the two ends of the guide copper bar are fixed to the electrical cabinet through the insulating seat, the guide copper bar is provided with a plurality of through holes, the upper part of the through hole is an inverted cone cavity; the inverted cone The connecting terminal includes a nut, a threaded connecting column, and a tapered mouth. A threaded connecting column is provided at the lower part of the tapered mouth, and the threaded connecting column is fixedly connected to the guide copper bus through a nut; the electrical cabinet also includes a control device for the reverse component of the asymmetric current input into the three-phase power grid, including a current transformer, a data sampling module and a calculation controller. The data sampling module collects the current data of phase A, phase B, and phase C input into the electrical cabinet through the current transformer. The calculation controller calculates and analyzes the data of the data sampling module. When the reverse component of the asymmetric current is serious, the power supply is cut off.
[0007] According to the electrical cabinet with safe operation as described above, it is characterized in that one of the inverted cone connection terminals of the A-phase terminal block, the B-phase terminal block, the C-phase terminal block, and the N-direction terminal block is respectively connected to the A-phase, B-phase, C-phase and neutral line input ends, and the remaining inverted cone connection terminals are respectively connected to the load.
[0008] According to the above-mentioned electrical cabinet with safe operation, the feature is that each guide copper busbar is provided with 7 through holes.
[0009] According to the above-mentioned electrical cabinet with safe operation, the feature is that the threaded connection column and the tapered opening are integrated and made of copper.
[0010] According to the above-mentioned electrical cabinet with safe operation, the characteristics are that the threaded connection column and the tapered opening are made of copper material.
[0011] According to the above-mentioned electrical cabinet with safe operation, the feature is that the data sampling module collects data on the negative sequence current by: asymmetric current negative sequence current sampling; the sampling time of phase A is used as a reference, phase B is delayed by K1 sampling values relative to phase A, and phase C is delayed by K2 sampling values relative to phase A, wherein the calculation formulas for K1 and K2 are: ; ; Asymmetric current positive sequence current sampling; Taking the sampling time of phase A as the benchmark, phase B is delayed by K2 sampling values relative to phase A, and phase C is delayed by K1 sampling values relative to phase A.
[0012] According to the electrical cabinet with safe operation as described above, it is characterized in that: after the calculation controller completes the data acquisition within one cycle, the A-phase, B-phase, and C-phase currents of the asymmetric current negative sequence current are accumulated in real time, the time domain is converted to the frequency domain through Fourier transform, the amplitude is extracted in the frequency domain, and the negative sequence current measurement value I1 is calculated; the A-phase, B-phase, and C-phase currents of the asymmetric current positive sequence current are accumulated in real time, the time domain is converted to the frequency domain through Fourier transform, the amplitude is extracted in the frequency domain, and the positive sequence current measurement value I1 is calculated.
[0013] According to the above-mentioned electrical cabinet with safe operation, it is characterized in that the calculation controller calculates the asymmetric current index N, ; Set the threshold A and counter T. When N is greater than or equal to the threshold A, the counter T starts timing. After the timing is reached, the control input relay trips. If N is less than the threshold A during the timing process, the counter T is reset to zero.
[0014] The beneficial effects of the present invention are: ensuring reliable electrical connection performance, preventing the occurrence of false connection or poor contact, and ensuring reliable connection even when the electrical cabinet is in a vibrating environment for a long time, thereby improving the safety performance of the electrical cabinet. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the wiring block structure.
[0016] Figure 2 Schematic diagram of the through hole.
[0017] Figure 3 This is the wiring diagram for the inverted cone connection terminal.
[0018] Figure 4 Schematic diagram of the inverted cone connection terminal structure.
[0019] Figure 5 Schematic diagram of the structure of the tapered mouth.
[0020] Figure 6 Enter the terminal block for the electrical cabinet.
[0021] Explanation of the reference numerals: insulating seat 1, guide copper bus 2, through hole 3, inverted cone connecting terminal 4, nut 41, threaded connecting column 42, tapered mouth 43, wire 5, A phase terminal block 6, B phase terminal block 7, C phase terminal block 8, N direction terminal block 9. DETAILED DESCRIPTION
[0022] The technical solution of the present invention is further described below with reference to the accompanying drawings.
[0023] like Figures 1 to 6As shown, an electrical cabinet with safe operation of the present invention includes an A-phase terminal block 6, a B-phase terminal block 7, a C-phase terminal block 8, and an N-direction terminal block 9. The A-phase terminal block 6, the B-phase terminal block 7, the C-phase terminal block 8, and the N-direction terminal block 9 are fixed on the electrical cabinet. One of the inverted cone connection terminals 4 of the A-phase terminal block 6, the B-phase terminal block 7, the C-phase terminal block 8, and the N-direction terminal block 9 is respectively connected to the A-phase, B-phase, C-phase and neutral line input ends, and the remaining inverted cone connection terminals 4 are respectively connected to the load, thereby realizing three-phase four-wire power supply to the load.
[0024] The structures of the A-phase terminal block 6, B-phase terminal block 7, C-phase terminal block 8, and N-direction terminal block 9 of the present invention are the same, including an insulating base 1, a guide copper bar 2, a through hole 3, and an inverted cone connection terminal 4. The two ends of the guide copper bar 2 are fixed to the electrical cabinet through the insulating base 1. The guide copper bar 2 is provided with multiple through holes 3, and 7 through holes 3 are provided in the figure. Figure 2 As shown, the upper portion of the through hole 3 is an inverted cone cavity. Figure 3 and Figure 4 As shown, the inverted tapered connecting terminal 4 of the present invention includes a nut 41, a threaded connecting post 42, and a tapered opening 43. The threaded connecting post 42 is disposed below the tapered opening 43 and is fixedly connected to the guide copper busbar 2 via the nut 41. One or more wires 5 to be connected pass through the threaded connecting post 42 into the tapered opening 43, and the wires 5 are fixed to the guide copper busbar 2 by tightening the nut 41.
[0025] The threaded connection column 42 and the tapered port 43 of the present invention are preferably integrated and made of copper.
[0026] The installation process of the device of the present invention is as follows: first, insert the inverted cone connection terminal 4 into the through hole 3 with the tapered opening 43 facing upward, then one or more wires 5 enter the tapered opening 43 from bottom to top, strip the insulation layer of the wire 5 according to the length of the connection required, and twist the core wires of multiple wires 5 together, or weld them together, so that the upper core wire is larger than the cavity with the threaded connection column 42, so that after the device of the present invention is fixed, the core wire will not be subjected to force when pulled by the outside, thereby improving the ability of the device of the present invention to withstand tension and making it more reliable, and then by tightening the nut 41, the inverted cone cavity at the top of the through hole 3 squeezes the tapered opening 43, so that the core wires pass through the tapered opening 43 and form a large extrusion force with the guide copper bus 2, ensuring reliable electrical performance of the connection and preventing the occurrence of false connection or poor contact. After the device of the present invention is installed, due to the use of the lower nut 41 to tighten, it will not fall off in a long-term vibration environment, so that the device of the present invention can be used in a long-term vibration environment such as trains and cars, ensuring its reliable connection, thereby improving the safety performance of the electrical cabinet.
[0027] The electrical cabinet of the present invention also includes a control device for the reverse component of the asymmetric current input to the three-phase power grid, including a current transformer, a data sampling module, and a calculation controller. The data sampling module collects current data of phases A, B, and C of the electrical cabinet through the current transformer. The calculation controller calculates and analyzes the data from the data sampling module. When the reverse component of the asymmetric current is severe, the power supply is cut off, thereby ensuring the safe operation of the electrical cabinet and related equipment. The data sampling module collects data on negative-sequence current as follows: asymmetric current negative-sequence current sampling; using one of the items as a reference, such as the sampling time of phase A as the reference, phase B is delayed by K1 sampling sample values relative to phase A, and phase C is delayed by K2 sampling sample values relative to phase A, where the calculation formulas for K1 and K2 are: ; f is the three-phase power frequency, typically 50 Hz. Fs is the sampling frequency of the data sampling module, such as 750 Hz. K1 is 5 and K2 is 10. Asymmetric positive sequence current sampling: With the sampling time of phase A as the reference, phase B is delayed by K2 sample values relative to phase A, and phase C is delayed by K1 sample value relative to phase A.
[0028] After the calculation controller completes data acquisition within a cycle, it accumulates the currents of phases A, B, and C of the asymmetric current negative sequence current in real time, converts the time domain to the frequency domain through Fourier transform, extracts the amplitude in the frequency domain, and calculates the negative sequence current measurement value I1; it accumulates the currents of phases A, B, and C of the asymmetric current positive sequence current in real time, converts the time domain to the frequency domain through Fourier transform, extracts the amplitude in the frequency domain, and calculates the positive sequence current measurement value I1; the calculation controller calculates the asymmetric current index N, ; Set the threshold A and the calculator T. When N is greater than or equal to the threshold A, the calculator T starts timing. After the timing is continuously reached, the control input relay is tripped. If N is less than the threshold A during the timing process, the calculator T is reset to zero. In this way, the sampling method of the present invention adopts a real-time sampling technology mode. There may be a short period of excessive asymmetric current index for a few seconds. Through the accumulation of the calculator T, it is ensured that the data excess for a few seconds can be filtered out by automatic reset, thereby ensuring that the control device of the present invention has a short non-tripping time and ensuring that some high-power electrical appliances (such as three-phase motors) will not cause abnormal tripping when started.
[0029] The control device of the present invention can be installed inside the electrical cabinet or on the power supply system side of the electrical cabinet, so as to realize remote monitoring of the operation of the electrical cabinet, thereby ensuring safe and reliable operation of the electrical cabinet.
Claims
1. An electrical cabinet with safe operation, comprising an A-phase terminal block, a B-phase terminal block, a C-phase terminal block, an N-direction terminal block, and a control device, wherein the A-phase terminal block, the B-phase terminal block, the C-phase terminal block, and the N-direction terminal block are fixed to the electrical cabinet, and characterized in that: The structures of the A-phase terminal block, the B-phase terminal block, the C-phase terminal block, and the N-direction terminal block are the same, including an insulating seat, a guide copper busbar, a through hole, and an inverted cone connecting terminal. The two ends of the guide copper busbar are fixed to the electrical cabinet through the insulating seat. The guide copper busbar is provided with multiple through holes, and the upper part of the through hole is an inverted cone cavity; the inverted cone connecting terminal includes a nut, a threaded connecting column, and a conical mouth. A threaded connecting column is provided at the lower part of the conical mouth, and the threaded connecting column is fixedly connected to the guide copper busbar through a nut; the electrical cabinet also includes a control device for the reverse component of the asymmetric current input into the three-phase power grid, including a current transformer, a data sampling module and a calculation controller. The data sampling module collects the current data of the A-phase, B-phase, and C-phase input into the electrical cabinet through the current transformer. The calculation controller calculates and analyzes the data of the data sampling module. When the reverse component of the asymmetric current is serious, the power supply is cut off.
2. The electrical cabinet with safe operation according to claim 1, characterized in that: One of the inverted cone connection terminals of the A-phase terminal block, the B-phase terminal block, the C-phase terminal block, and the N-direction terminal block is respectively connected to the A-phase, B-phase, C-phase and neutral line input terminals, and the remaining inverted cone connection terminals are respectively connected to the load.
3. The electrical cabinet with safe operation according to claim 1, characterized in that: Each guide copper busbar is provided with 7 through holes.
4. The electrical cabinet with safe operation according to claim 1, characterized in that: The threaded connection column and the tapered mouth are integrated.
5. The electrical cabinet with safe operation according to claim 1, characterized in that: The threaded connection column and tapered mouth are made of copper.
6. The electrical cabinet with safe operation according to claim 1, characterized in that: The data sampling module collects data on negative sequence current as follows: asymmetric current negative sequence current sampling; phase A sampling time is used as the reference, phase B is delayed by K1 sampling values relative to phase A, and phase C is delayed by K2 sampling values relative to phase A. The calculation formulas for K1 and K2 are: ; ;Asymmetric current positive sequence current sampling; Taking the sampling time of phase A as the reference, phase B is delayed by K2 sampling values relative to phase A, and phase C is delayed by K1 sampling values relative to phase A.
7. The electrical cabinet with safe operation according to claim 6, characterized in that: After the calculation controller completes data collection within one cycle, it accumulates the A-phase, B-phase, and C-phase currents of the asymmetric negative-sequence current in real time, converts the time domain to the frequency domain through Fourier transform, extracts the amplitude in the frequency domain, and calculates the negative-sequence current measurement value I1; it accumulates the A-phase, B-phase, and C-phase currents of the asymmetric positive-sequence current in real time, converts the time domain to the frequency domain through Fourier transform, extracts the amplitude in the frequency domain, and calculates the positive-sequence current measurement value I1.
8. The electrical cabinet with safe operation according to claim 7, characterized in that: The calculation controller calculates the asymmetric current index N, ; Set the threshold A and counter T. When N is greater than or equal to the threshold A, the counter T starts timing. After the timing is reached, the control input relay trips. If N is less than the threshold A during the timing process, the counter T is reset to zero.