Interference voltage waveform simulation and measurement device with time sequence output

Abstract

An interference electricity waveform simulation and measurement device with time sequence output is characterized in that the interference electricity waveform simulation and measurement device comprises a cabinet body, an operation table, a main voltage output unit and a PLC control unit, the interior of the cabinet body is divided into an upper part and a lower part, the upper half part of the cabinet body is provided with the operation table, the lower half part of the cabinet body is hollow, and the main voltage output unit is connected with the PLC control unit. A main voltage output unit is arranged in the lower half part of the cabinet body, and a PLC control unit is arranged in the lower half part of the cabinet body; three groups of isolation transformers and voltage regulating transformers are connected in series to form a voltage output circuit, electrical logic control is realized by using a PLC, no breakpoint of voltage conversion is realized, the detector can accurately simulate the interference electricity phenomenon and detect the anti-interference electricity function of a low-voltage electric appliance, and the reliability of the detector is improved. Electrical control intelligence: intelligent voltage time sequence control is designed based on a PLC, man-machine interaction is realized through a touch screen, and reliable operation and no electromagnetic interference are ensured through combination of various low-voltage elements.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliance detection, and in particular to a device for simulating and measuring an electric shaking waveform with a sequential output. Background Art

[0002] As the scale and complexity of power systems continue to expand, the various interference factors that affect the power grid are also increasing. For example, short-circuit faults in the power grid, the start and stop of large equipment, and lightning strikes may all cause power swings. The degree of automation in the field of industrial production continues to increase, and a large number of precision electronic equipment and automated production lines are widely used. These equipment and production lines have extremely high requirements for the stability and continuity of power supply. Even a short power swing may lead to serious consequences such as production interruption, product quality degradation, and even equipment damage. Many key electrical equipment, such as contactors, motor protectors, etc., need to maintain normal operation in the case of power swings to ensure the continuity and safety of the production process. Therefore, these electrical equipment are usually designed with certain anti-power swing functions.

[0003] In order to ensure that the anti-electrical shaking function of electrical equipment is reliable and effective, a scientific and accurate method is needed to verify and test it to ensure that it can cope with electric shaking events in actual operation.

[0004] Traditional testing methods for electrical equipment's anti-electrical shaking function often have problems such as low testing efficiency, poor accuracy, and complex operation. For example, some testing methods may require manual construction of circuits to simulate electric shaking phenomena, which makes it difficult to accurately control the parameters of the electric shaking, resulting in insufficient reliability of the test results. Traditional testing methods may not be able to comprehensively and systematically evaluate the anti-electrical shaking function of electrical equipment, and it is difficult to meet the high requirements of modern power systems and industrial production for the reliability of electrical equipment. Therefore, it is necessary to provide a new automatic testing system for anti-electrical shaking function to solve the above problems.

[0005] In addition, with the continuous improvement of industrial automation, the testing requirements of various electrical equipment and systems have become more and more complex. In the field of low-voltage electrical testing, the traditional manual operation and simple timer used in the connection and disconnection test can no longer meet the requirements of efficient and accurate testing. The industry needs a device that can achieve automated control and higher precision.

[0006] In some low-voltage electrical appliance connection and disconnection tests, precise control of time is very critical. For example, the connection and disconnection of some electrical equipment need to be tested multiple times within a specific time interval. Using a PLC time program controller to achieve timing output, the connection time and disconnection time can be accurately set, and its time accuracy can reach milliseconds or even microseconds. This is much more accurate than manual operation or ordinary timers.

[0007] Suppose that to test the connection and disconnection performance of a relay, 100 connection and disconnection operations need to be performed within an interval of 10ms. Through PLC timing output, it is easy to write a program to implement this precise time control sequence, while manual operation is difficult to achieve such accuracy requirements. To solve the above problem, a shaking current waveform simulation and measurement device with timing output is proposed. Summary of the invention

[0008] In view of the above technical problems, the present invention provides a sloshing waveform simulation and measurement device with timing output, which is characterized by comprising a cabinet, an operating table, a main voltage output unit, and a PLC control unit. The cabinet is divided into two parts, the upper part of the cabinet is provided with an operating table, and the lower part of the cabinet is hollow. The main voltage output unit is provided inside the cabinet, and the PLC control unit is provided inside the cabinet. Furthermore, the cabinet has a movable wheel hub at the bottom, and there are front and rear cabinet doors with output interface openings on the cabinet. The lower half of the cabinet has a mounting bracket inside, and three 25kg voltage-regulating transformers and three 30kg isolation transformers are mounted on the mounting bracket. The mounting bracket is made of three-bent steel and a right-angle bracket with a φ10mm opening in combination with an aluminum alloy mounting rail, and is fixed to the bottom of the cabinet by φ8mm screws. The back of the cabinet is provided with an output voltage port, with a φ10mm opening, in two rows, with a total of 8 groups; Furthermore, the main voltage output unit is used to build a voltage output control circuit, including three TEDGC2-5kVA voltage regulating transformers and three BK-5kVA isolation transformers. Each voltage regulating transformer and each isolation transformer form a voltage output, a total of three groups, denoted as U1-U3, and connected in series. The final output is a total voltage denoted as U. The tested electrical appliance is connected to the port of U. Each voltage group is equipped with a motor adjustment. The three groups of overall input and output ends are electrically connected to the PLC control unit. Each voltage group is equipped with a motor adjustment, the input end is connected to a contactor for disconnecting the main circuit, and the output end is connected to a voltmeter to read the voltage value; Furthermore, the operating table is provided with a touch screen, a boost button, a buck button, an oscilloscope, an installation panel, a control button, a selection switch, a green indicator light, and a terminal block. A boost button, a buck button, a green indicator light, and a selection switch constitute a voltage regulating group, and there are three groups in total, which are electrically connected to three voltage regulating transformers respectively. The touch screen is electrically connected to the PLC control unit, the touch screen is SIMATIC HMI Smart 700 IE V4, and the oscilloscope adopts UPO1204X; Furthermore, the PLC control unit includes SIMATIC S7-200SMART, CPUSR30 PLC controller, MEANWELLED R-120-2424V power supply, iC65NC6A2P small circuit breaker, LC1D1212A AC contactor, RT28-32 fuse, RXM2LB2BD relay, and is electrically connected through wires.

[0009] Beneficial effects of the present invention: 1) Design a reasonable electrical control system: Use 3 sets of isolation transformers and voltage regulating transformers in series to form a voltage output circuit, use PLC to realize electrical logic control, and achieve voltage conversion without breakpoints, ensuring that the detector can accurately simulate the power shaking phenomenon and detect the anti-power shaking function of low-voltage electrical appliances. Intelligent electrical control: Based on PLC design, intelligent voltage timing control, touch screen to achieve human-computer interaction, and a combination of multiple low-voltage components to ensure reliable operation without electromagnetic interference; 2) Develop a friendly human-computer interaction interface: Implement friendly human-computer interaction on the touch screen, design parameter setting diagrams to facilitate user operation and monitoring, design intelligent voltage timing control based on PLC, realize human-computer interaction on the touch screen, continuous voltage output without breakpoints, intuitively display the test process, design and layout of transformer voltage regulators, control components, etc. to ensure the electromagnetic compatibility of the instrument, and mobile architecture multi-purpose interface to adapt to a variety of products and working environments; 3) Flexible mechanical design: universal matching connectors and human-machine friendly operation platform are used to meet the detection requirements of anti-sway function and timing control of various low-voltage electrical appliances, ensuring reliable service life: the test function can operate reliably for a long time, and the protection circuit design prevents over-action; 4) Structural design optimization: adopt reasonable dynamic line design and mobile thinking to solve the problems of multi-adaptability and aesthetics; 5) Design cost control: Comprehensively consider the cost and performance of each part to facilitate mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of a device for simulating and measuring electric sloshing waveforms with sequential output according to the present invention; Figure 2 This is the main circuit diagram of the anti-electrical shaking function part of an electric shaking waveform simulation and measurement device with timing output of the present invention; Figure 3 This is a control circuit diagram of the anti-electrical shaking function part of an electric shaking waveform simulation and measurement device with timing output of the present invention; Figure 4 This is a control circuit diagram of the timing output part of a device for simulating and measuring electric sloshing waveforms with timing output according to the present invention; Figure 5This is an overall operation flow chart of a device for simulating and measuring electric sloshing waveforms with sequential output according to the present invention; As shown in the figure: 1-cabinet, 2-operating table, 3-main voltage output unit, 4-PLC control unit. DETAILED DESCRIPTION

[0011] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0013] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0014] Example 1 The present invention provides a device for simulating and measuring electric shaking waveforms with sequential output, which is characterized by comprising a cabinet, an operating table, a main voltage output unit, and a PLC control unit. The cabinet is divided into an upper and lower part. The upper part of the cabinet is provided with an operating table, and the lower part of the cabinet is hollow. The main voltage output unit is provided inside the cabinet, and the PLC control unit is provided inside the cabinet. Furthermore, the cabinet has a movable wheel hub at the bottom, and there are front and rear cabinet doors with output interface openings on the cabinet. The lower half of the cabinet has a mounting bracket inside, and three 25kg voltage-regulating transformers and three 30kg isolation transformers are mounted on the mounting bracket. The mounting bracket is made of three-bent steel and a right-angle bracket with a φ10mm opening in combination with an aluminum alloy mounting rail, and is fixed to the bottom of the cabinet by φ8mm screws. The back of the cabinet is provided with an output voltage port, with a φ10mm opening, in two rows, with a total of 8 groups; Furthermore, the main voltage output unit is used to build a voltage output control circuit, including three TEDGC2-5kVA voltage regulating transformers and three BK-5kVA isolation transformers. Each voltage regulating transformer and each isolation transformer form a voltage output, a total of three groups, denoted as U1-U3, and connected in series. The final output is a total voltage denoted as U. The tested electrical appliance is connected to the port of U. Each voltage group is equipped with a motor adjustment. The three groups of overall input and output ends are electrically connected to the PLC control unit. Each voltage group is equipped with a motor adjustment, the input end is connected to a contactor for disconnecting the main circuit, and the output end is connected to a voltmeter to read the voltage value; Furthermore, the operating table is provided with a touch screen, a boost button, a buck button, an oscilloscope, an installation panel, a control button, a selection switch, a green indicator light, and a terminal block. A boost button, a buck button, a green indicator light, and a selection switch constitute a voltage regulating group, and there are three groups in total, which are electrically connected to three voltage regulating transformers respectively. The touch screen is electrically connected to the PLC control unit, the touch screen is SIMATIC HMI Smart 700 IE V4, and the oscilloscope adopts UPO1204X; Furthermore, the PLC control unit includes SIMATIC S7-200SMART, CPUSR30 PLC controller, MEANWELLED R-120-2424V power supply, iC65NC6A2P small circuit breaker, LC1D1212A AC contactor, RT28-32 fuse, RXM2LB2BD relay, and is electrically connected through wires.

[0015] Example 2 The operating console completes the forward and reverse control of the motor of the manual voltage regulator through electrical control, and flexibly sets the holding time and drop time on the touch screen to achieve voltage output and realize automatic control. The timing control function part is connected to the output port of 8 channels to meet the needs of various control lines; The touch screen is SIMATIC HMI Smart 700 IE V4, with clear image display and large window for easy observation and operation. Connect to PLC, set adjustment boxes such as hold time and drop time, and display time dynamic function, unit information, dynamic clock, etc. The oscilloscope is UPO1204X, which is used to measure the disconnection of the tested electrical appliance and obtain the recovery time; The PLC control unit is connected to the touch screen on the operating table for control. Programming is used to set the holding time, drop time and other programs. The contactor is connected to the transformer under the cabinet to select the voltage segment and determine the output value. The PLC is designed for time control in the order of ms and 10ms for the timing control function. It is connected to the output port of 8 channels and can be easily operated according to the timing control diagram. Power shake function control part: 1. Voltage meter display area: VT1-VT3, VT 4 voltmeters are installed, which can directly display the voltage value after being turned on. VT1 is used to display U1 in the timing control, VT2 is used to display U2 in the timing control, VT3 is used to display U3 in the timing control, VT is used to display the final output voltage U in the timing control, U1 is the drop voltage, U1+U2 is the initial voltage, and U1+U3 is the recovery voltage; 2. Oscilloscope: Equipped with a measuring oscilloscope, which is used to accurately record the action time of the tested electrical appliance. During operation, the ground terminal and the measuring terminal of the main measurement channel are respectively connected to the incoming and outgoing terminals of the action pole of the tested electrical appliance, and the measurement parameters of the oscilloscope panel are adjusted, and the electrical signal acquisition is started by clicking on it; 3.PLC operation area: "Page 1" and "Page 2" touch pages can be used to set the initial time and drop time, directly touch the screen to input the time value, and touch to start the control line to run and stop; 4. Instructions for the selection switches on the operating console: "Allow" selection switch on the left cabinet: State 0 is used to close PLC panel debugging, and state 1 is used to start PLC panel debugging; "Test circuit, debug circuit" selection switch: Start the debug circuit and prepare to start debugging the initial voltage, drop voltage, and recovery voltage in the early stage of the power swing test; Start the test circuit to start the power swing test. At this time, the debug circuit has been closed and the voltage values ​​are fixed and cannot be changed; prepare to start the PLC time setting and open the voltage output path; 5. U1-U3 three groups of voltage adjustment parts: respectively equipped with green signal indicator lights T1-3, used to indicate the connection of the three voltage regulators, "allow" selection switch, used to connect the three voltage regulators and voltage regulating motors; green "boost" button switch, red "step-down" button switch; used to adjust the output voltage of the three voltage regulators; Take U1 as an example: voltage debugging "allow" selection switch, state 0 is used to turn off U1 adjustment, state 1 is used to turn on U1 adjustment, after turning it on, the green signal indicator light is on, and the "boost" and "lower" buttons can adjust the value of U1 as needed; 6. Output interface: There is a 1-way test interface on the lower right side of the cabinet; it has two red and black terminals; Timing function control part: 1.PLC function: "Page 3" touch page, used for single timing control of relays in the circuit, named channels are DQa.4, DQa.5, DQa.6, DQa.7, DQb.0, DQb.1, a total of 6 channels, of which DQa.4, DQa.5, DQa.6, DQa.7 set the connection time unit is ms, DQb.0, DQb.1, set the connection time unit is 10ms, each channel can press the channel enable selection, after pressing, the connection indicator light will light up to prompt, each channel can set a connection time according to the diagram; "Page 4" touch page is used for continuous timing control of relays in the circuit. It is named DQb.2 and DQb.3. Both channels can be set to 4 sections of on-time according to the diagram according to actual needs. The on-time unit of DQb.2 is ms, and the on-time unit of DQb.3 is 10ms. After pressing the cycle permission program, the total number of cycles can be set, and the number of cycle runs can be displayed in real time. The cycle period can also be set, and the cycle running time can be displayed in real time. The green signal light is always on during the operation. 2. Output interface: 8 groups of output ports, all of which are red and black terminals, numbered DQa.4, DQa.5, DQa.6, DQa.7, DQb.0, DQb.1, DQb.2, DQb.3, corresponding to the channel names in pages 3 and 4; Power shake function control operation: 1. Test bench setting: Select an appropriate test environment, fix the mobile hub, plug the plug on the left side of the cabinet of the test system for electrical anti-sway function into the three-hole socket to power on, and close the main circuit breaker in the cabinet; 2. Debug connection: The "Allow" selection switch on the left side of the console: connected to state 0; Select the switch in the middle of the operating table to turn on the "debugging part" circuit and prepare to debug the initial voltage, drop voltage, and recovery voltage; In the voltage adjustment section of the console: Adjust the drop voltage of U1, turn the selector switch of T1 to "1" to connect the adjustment circuit of U1, the indicator light of T1 is on, press the boost button intermittently, observe the display of the voltmeter VT1 of the U1 part, and slowly adjust the voltage to the target value. If the adjustment is higher than the target value, press the voltage reduction button intermittently for fine-tuning until it is adjusted to the target value and stabilizes; Adjust the initial voltage of U1+U2, turn the selector switch of T2 to "1" to connect the U2 adjustment circuit, the T2 indicator light is on, press the boost button intermittently, observe the voltage meter VT2 display of the U2 part, and slowly adjust the voltage to the target value. If the adjustment is higher than the target value, press the voltage reduction button intermittently for fine-tuning until it is adjusted to the target value and stabilizes. At this time, the VT meter displays U1+U2, which is the initial voltage value; Adjust U1+U3 to restore the voltage. Turn the selector switch of T3 to "1" to connect the U3 adjustment circuit. The T3 indicator light is on. Press the boost button intermittently. Observe the voltage meter VT3 display of the U3 part at this time. Slowly adjust the voltage to the target value. If the adjustment is higher than the target value, press the voltage reduction button intermittently for fine-tuning until the target value is adjusted and stabilized. At this time, the VT meter displays U1+U3, which is the restored voltage value. 3. Test connection: Turn on the middle selector switch on the operating console to connect the "test part" circuit, and turn all three selector switches under T1-3 to "0"; 4. Install the test sample: Connect the voltage input terminal of the sample to be tested to the 1-way test interface on the lower right side of the cabinet, connect the red terminal to the incoming line and the black terminal to the outgoing line; 5. Connect to oscilloscope: Connect the ground terminal and the measuring terminal of the main measuring channel of the oscilloscope to the incoming and outgoing terminals of the operating pole of the tested electrical appliance respectively; 6. Set the time: The "Allow" selection switch on the left side of the console: connected to state 1; Click the touch screen to enter the PLC debugging panel; Set the initial time and input the time value directly on the touch screen; To set the drop time, directly enter the time value on the touch screen; 7. Start operation: Oscilloscope acquisition: adjust the measurement parameters on the oscilloscope panel, turn on the signal capture mode, and click Run Single Acquisition to start electrical signal acquisition; Then press the start button on the touch screen to start the control circuit operation; 8. Stop the test and read the results: During the test, the operating status of the tested product is recorded: flashing, restored to normal, disconnected and not restored, etc. After the power shake fault recovery time runs for a period of time, press the stop button on the touch screen to stop the control line operation; At this time, the electrical signal of the tested product is recorded on the display screen of the oscilloscope. By turning the knob, moving the cursor, etc., the time it takes for the tested product to resume operation after power failure after power shake can be measured; 9. Shutdown and clean up: The "Allow" selection switch on the left side of the console: connected to state 0; Open the main circuit breaker in the cabinet and unplug the plug to cut off the power; Remove the oscilloscope measurement line and dismantle the sample; Timing function control operation: 1. Test bench setting: Select an appropriate test environment, fix the mobile hub, insert the plug on the left side of the cabinet of the test system for electrical anti-sway function into the three-hole socket to power on, and close the main circuit breaker in the cabinet; 2. Control line access: Connect the control line ports to the red and black terminals at the rear of the cabinet as needed; 3. Touch screen settings: In page 3, DQa.4, DQa.5, DQa.6, DQa.7, DQb.0, and DQb.1 control 6 channels. The 6 channels can be used individually to control the on and off of a circuit, or they can be used together to control the on and off of multiple circuits according to a set timing.

[0016] For single-channel use, take channel DQa.4 as an example. Set the time when the circuit is connected through the touch screen connection setting, set the length of the connection time through the touch screen connection setting, select DQa.4 channel as allowed through the channel enable button, and then start control through the start button on the touch screen.

[0017] For multi-channel coordination, take channels DQa.4 and DQa.5 as examples. Enter 100ms in the DQa.4 on-setting and 50ms in the on-time setting. Enter 200ms in the DQa.5 on-setting and 50ms in the on-time setting to control the on-off time of the two circuits. DQa.4 controls one circuit to be on at 100-150ms, and DQa.5 controls the other circuit to be on at 200-250ms.

[0018] In page 4, DQb.2 and DQb.3 control two channels; In single operation, take DQb.2 channel control as an example, directly input 100ms in the input box below "Connect 1", input 50ms in the input box below "Connect 1 Time", input 100ms in the input box below "Connect 2", and input 50ms in the input box below "Connect 2 Time"; It means that the timing starts from the start of PLC. From 0 to 100ms, DQb.2 channel is not connected. From 100ms to 150ms, DQb.2 channel is connected. From 150 to 250ms, DQb.2 channel is not connected. From 250ms to 300ms, DQb.2 channel is connected. DQb.2 and DQb.3 can input 4 connection times. During the cycle operation, directly input the input boxes behind "Cycle Period" and "Total Cycles" on the touch screen. For example, if you input "Cycle Period" as 5s and "Total Cycles" as 2 times, it means that the time is controlled according to the DQb.2 channel, and the cycle is cycled every 5s. The output stops after 2 cycles. 4. Start operation: Press the start button on the touch screen to start the control circuit operation; 5. Stop the test: Press the stop button on the touch screen to stop the control line operation; 6. Shutdown and clean up: The "Allow" selection switch on the left side of the console: connected to state 0; Open the main circuit breaker in the cabinet and unplug the plug to cut off the power; Remove the sample.

[0019] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. The various components mentioned in the present invention are common technologies in the existing field. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for simulating and measuring electric sloshing waveform with sequential output, characterized in that: It includes a cabinet, an operating table, a main voltage output unit, and a PLC control unit. The cabinet is divided into two parts, the upper part of the cabinet is provided with an operating table, and the lower part of the cabinet is hollow. The main voltage output unit is arranged inside the cabinet, and the PLC control unit is arranged inside the cabinet. The main voltage output unit is used to build a voltage output control circuit, including three voltage-regulating transformers and three isolation transformers. Each voltage-regulating transformer and each isolation transformer form a voltage output, a total of three groups, and are connected in series. Each voltage group is equipped with a motor adjustment, and the input and output ends of the three groups are electrically connected to the PLC control unit.

2. According to claim 1, a device for simulating and measuring electric sloshing waveforms with sequential output, characterized in that: The bottom of the cabinet is provided with a movable wheel hub, the cabinet is provided with front and rear cabinet doors with output interface openings, the lower part of the cabinet is provided with a mounting bracket inside, and the mounting bracket is provided with a main voltage output unit.

3. According to claim 2, a device for simulating and measuring electric sloshing waveforms with sequential output, characterized in that: The operating table is provided with a touch screen, a boost button, a buck button, an oscilloscope, an installation panel, a control button, a selection switch, a green indicator light, and a connection terminal. A boost button, a buck button, a green indicator light, and a selection switch constitute a voltage regulating group, and there are three groups in total, which are electrically connected to three voltage regulating transformers respectively, and the touch screen is electrically connected to the PLC control unit.

4. According to claim 3, a device for simulating and measuring electric sloshing waveforms with sequential output, characterized in that: The PLC control unit includes SIMATIC S7-200SMART, CPUSR30 PLC controller, MEANWELLED R-120-2424V power supply, iC65NC6A2P small circuit breaker, LC1D1212A AC contactor, RT28-32 fuse, RXM2LB2BD relay, and is electrically connected through wires.

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