Voltage detection device for rectifier cabinet
By designing a voltage detection device for rectifier cabinets, the use of AC voltage transformers and high voltage fuses to convert high voltage into measurable currents, solving the problems of high incoming voltage and inaccurate phase measurement, ensuring the stability of the system and reducing the Economic losses.
Patent Information
- Application Number
- CN202420021925.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-04
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-01-04
AI Technical Summary
The inlet voltage in the rectifier cabinet is high and difficult to measure, resulting in inaccurate measurement of the inlet voltage phase, affecting the stable operation of the system.
Design a voltage detection device, including a power supply module, an AC voltage transformer, a resistor and a high voltage fuse, convert high voltage into a small current through an AC voltage transformer, and obtain the waveform of the incoming voltage of the rectifier cabinet through an oscilloscope, and high voltage fuse The device is used for protection, and the auxiliary contacts cut off the voltage input for safety.
Accurate measurement and phase detection of the incoming voltage of the high-voltage rectifier cabinet are realized, ensuring stable operation of the system and reducing equipment damage and economic losses.
Smart Images
Figure CN222319038U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of voltage measurement, and in particular to a voltage detection device for a rectifier cabinet. Background Art
[0002] In the rectifier cabinet of the Hitachi main drive cabinet of the 1420 acid rolling production line, 1700 acid rolling production line, 18-roller single-frame production line, and No. 2 rolling mill production line, the phase angle of the synchronous transformer voltage waveform and the high-voltage incoming voltage waveform must be consistent in order to correctly control the pulse triggering and the normal operation of the transmission system. Therefore, it is necessary to detect the incoming voltage phase of the rectifier cabinet and the PWM (Pulse Width Modulation) voltage phase output by the rectifier cabinet to ensure the stable operation of the system.
[0003] In daily maintenance, the following difficulties are found when detecting the phase of the incoming voltage of the rectifier cabinet and the phase of the PWM voltage output by the rectifier cabinet:
[0004] (1) The effective value of the incoming line voltage of the rectifier cabinet is 1900V, and the maximum value is 2687V. Ordinary oscilloscopes cannot measure it directly.
[0005] (2) During the detection of the phase of the incoming voltage waveform, the incoming voltage phase is measured inaccurately and a deviation occurs. Utility Model Content
[0006] The purpose of the present application is to provide a voltage detection device for a rectifier cabinet to solve the problem that, during the process of measuring the incoming line voltage of the rectifier cabinet, the incoming line voltage is difficult to measure due to its high voltage and the incoming line voltage phase measurement is inaccurate.
[0007] In order to achieve the above-mentioned object, the present application provides a voltage detection device for a rectifier cabinet, characterized in that it includes a power supply module, an AC voltage transformer, a resistor and a high-voltage fuse, the power supply module is connected to the AC voltage transformer, so as to supply power to the AC voltage transformer;
[0008] The input end of the AC voltage transformer is connected to two phases of the incoming line voltage of the rectifier cabinet through two high-voltage fuses, and the output end is connected to one end of the resistor, the other end of the resistor is grounded, and the two ends of the resistor are used to connect to the oscilloscope, so as to obtain the waveform of the line voltage between the two phases of the incoming line voltage of the rectifier cabinet through the oscilloscope;
[0009] The high-voltage fuse has an auxiliary contact, which is connected to the rectifier cabinet and is used to cut off the input of the incoming line voltage of the rectifier cabinet when the high-voltage fuse blows.
[0010] In some embodiments of the present application, based on the aforementioned solution, the power module has a grounding point, and the other end of the resistor is connected to the grounding point of the power module to be grounded.
[0011] In some embodiments of the present application, based on the aforementioned scheme, the number of AC voltage transformers and resistors is two, and the number of high-voltage fuses is four. One AC voltage transformer, one resistor and two high-voltage fuses correspond to the R phase and S phase of the incoming line voltage of the rectifier cabinet, and another AC voltage transformer, another resistor and another two high-voltage fuses correspond to the T phase and S phase of the incoming line voltage of the rectifier cabinet.
[0012] In some embodiments of the present application, based on the aforementioned solution, the voltage detection device also includes an alarm device, and the alarm device is connected to the power module.
[0013] In some embodiments of the present application, based on the aforementioned solution, the alarm device is an audible and visual alarm light.
[0014] In some embodiments of the present application, based on the aforementioned solution, the model of the AC voltage transformer is LEM DV4200 / SP4.
[0015] In some embodiments of the present application, based on the aforementioned solution, the power supply module is used to convert the AC power into a DC output, thereby supplying power to the AC voltage transformer.
[0016] In some embodiments of the present application, based on the aforementioned scheme, the voltage detection device also includes a high-voltage cable, the input end of the AC voltage transformer is connected to one end of the high-voltage fuse through the high-voltage cable, and the other end of the high-voltage fuse is input into the incoming line voltage of the rectifier cabinet through the high-voltage cable.
[0017] In some embodiments of the present application, based on the aforementioned solution, the voltage detection device further includes an insulating board, and the power module, the AC voltage transformer, the resistor and the high-voltage fuse are all arranged on the insulating board.
[0018] In some embodiments of the present application, based on the aforementioned solution, the voltage detection device further includes a voltmeter connected to both ends of the resistor.
[0019] The technical solution of the present application provides a voltage detection device for a rectifier cabinet, including a power module, an AC voltage transformer, a resistor and a high-voltage fuse. The power module is connected to the AC voltage transformer to supply power to the AC voltage transformer; the input end of the AC voltage transformer is connected to two phases of the incoming line voltage of the rectifier cabinet through two high-voltage fuses, the output end is connected to one end of the resistor, the other end of the resistor is grounded, and the two ends of the resistor are used to connect an oscilloscope, so as to obtain the waveform of the line voltage between the two phases of the incoming line voltage of the rectifier cabinet through the oscilloscope; the high-voltage fuse has an auxiliary contact, the auxiliary contact is connected to the rectifier cabinet, and is used to cut off the input of the incoming line voltage of the rectifier cabinet when the high-voltage fuse is blown. The present application solves the problem that in the process of measuring the incoming line voltage of the rectifier cabinet, due to the high incoming line voltage, it is difficult to measure and the incoming line voltage phase measurement is inaccurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0021] In the attached picture:
[0022] Figure 1 This is a circuit schematic diagram of a voltage detection device for a rectifier cabinet according to an embodiment of the present application. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0024] Some embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.
[0025] See also Figure 1 The embodiment of the present application provides a voltage detection device for a rectifier cabinet, including a power module 1, an AC voltage transformer 2, a resistor R and a high-voltage fuse 3. The power module 1 is connected to the AC voltage transformer 2 to supply power to the AC voltage transformer 2. The AC voltage transformer 2 is used to convert a high voltage into a low current output. The input end of the AC voltage transformer 2 is connected to two phases of the incoming line voltage of the rectifier cabinet through two high-voltage fuses 3, and the output end is connected to one end of the resistor R, and the other end of the resistor R is grounded. The two ends of the resistor R are used to connect to an oscilloscope, so that the waveform of the line voltage between the two phases of the incoming line voltage of the rectifier cabinet is obtained through the oscilloscope.
[0026] The high-voltage fuse 3 has an auxiliary contact 31, which is connected to the rectifier cabinet and is used to cut off the input of the incoming line voltage of the rectifier cabinet when the high-voltage fuse 3 is blown. Therefore, the high-voltage fuse 3 plays a role in short-circuit protection, and the auxiliary contact 31 can also further protect the safety of operators and equipment.
[0027] In some embodiments, the power module 1 has a grounding point, and the other end of the resistor R is connected to the grounding point of the power module 1 to be grounded.
[0028] It should be noted that, since the incoming line voltage of the rectifier cabinet is a three-phase voltage (R phase, S phase, T phase), and since the vector sum of the three phases in the three-phase voltage is 0, it is only necessary to detect two of the phases to obtain the waveform of the incoming line three-phase voltage. Therefore, in some embodiments, the number of AC voltage transformers 2 and resistors R is two, the number of high-voltage fuses 3 is four, one AC voltage transformer 2, one resistor R and two high-voltage fuses 3 correspond to the R phase and S phase of the incoming line voltage of the rectifier cabinet, and another AC voltage transformer 2, another resistor R and another two high-voltage fuses 3 correspond to the T phase and S phase of the incoming line voltage of the rectifier cabinet. Figure 1 In the example, the input terminals A and B of an AC voltage transformer 2 are respectively connected to the R phase and S phase of the incoming line voltage of the rectifier cabinet, and the input terminals C and D of another AC voltage transformer 2 are respectively connected to the S phase and T phase of the incoming line voltage of the rectifier cabinet, thereby obtaining the line voltage waveforms between the R phase and the S phase, and between the S phase and the T phase.
[0029] During detection, the AC voltage transformer 2 converts the line voltage between the two phases of the corresponding rectifier cabinet's incoming line voltage (the voltage value is high and cannot be directly measured) into a small current and outputs it through the corresponding resistor R. Therefore, the dual-channel measurement probes of the dual-channel oscilloscope can be used to contact the two ends of the two resistors R respectively, so as to detect the line voltage waveform of the two phases in the corresponding rectifier cabinet's incoming line voltage. After that, the incoming line voltage phase of the rectifier cabinet is compared with the PWM voltage phase output by the rectifier cabinet to ensure the stable operation of the rectifier system.
[0030] In some embodiments, the voltage detection device further includes an alarm device 4, which is connected to the power module 1, so that the power module 1 supplies power to the alarm device 4. Optionally, the alarm device 4 may use an audible and visual alarm light, so that during the incoming line voltage detection process of the rectifier cabinet, the audible and visual alarm light emits an alarm sound and the alarm light flashes, which serves to remind personnel of the high voltage danger and to keep away from the voltage detection device, thereby further protecting the safety of operators and equipment.
[0031] Specifically, the model of the AC voltage transformer 2 is LEM DV4200 / SP4, which can output an input voltage of 4200V as a current of 50mA. A small current flows through the resistor R, so the waveform of the input voltage can be obtained by detecting the voltage waveform across the resistor R, and then compared with the PWM voltage phase output by the rectifier cabinet to ensure the stable operation of the rectifier system.
[0032] Specifically, the power module 1 is used to convert the mains power (220V AC) into DC power (15V) for output, so as to supply power to the AC voltage transformer 2. The resistance value of the resistor R may be 2 kilo-ohms.
[0033] In some embodiments, the voltage detection device further includes a high-voltage cable 5, the input end of the AC voltage transformer 2 is connected to one end of the high-voltage fuse 3 through the high-voltage cable 5, and the other end of the high-voltage fuse 3 inputs the incoming line voltage of the rectifier cabinet through the high-voltage cable 5. The high-voltage fuse 3 is arranged at the input end of the AC voltage transformer 2, and the high-voltage cable 5 is used as a connecting line to further improve the voltage resistance performance of the line, which can ensure the safety of equipment and personnel.
[0034] In some embodiments, the voltage detection device also includes an insulating board 6, and the power module 1, AC voltage transformer 2, resistor R, high-voltage fuse 3, alarm device 4, and high-voltage cable 5 are all arranged on the insulating board 6. The insulating board 6 can fix various components and set wiring grooves for connecting wires to prevent wiring wires from falling on the ground, further ensuring safety during the detection process and facilitating use.
[0035] In some embodiments, the voltage detection device further includes a voltmeter, which is connected to both ends of the resistor R. The voltage across the resistor R can be intuitively known through the voltmeter to determine whether the detection device has a fault. For example, if the reading of the voltmeter is abnormally high, it is possible to know that the detection device has a fault without using an oscilloscope for detection.
[0036] The voltage detection device provided by the present application can realize the autonomous debugging of the rectifier cabinet of the Hitachi transmission system. Previously, due to the lack of such a detection device, the phase test of the incoming voltage of the rectifier cabinet could not be completed, and the debugging of the rectifier cabinet could not be carried out, and the Japanese side was required to carry out this work. And it can ensure the safe operation of the rectifier equipment. By using the voltage detection device of the present application to perform the phase detection of the incoming voltage of the rectifier cabinet, the phase deviation can be found in time. Timely adjustment after the phase deviation occurs can avoid damage to the power unit of the rectifier cabinet. There are 3 groups of power units per phase incoming line, and the unit price of each power unit is 700,000 yuan. Then, the voltage detection device can reduce the equipment loss to 3×70=2.1 million yuan, thereby reducing economic losses for the enterprise.
[0037] In summary, the present application provides a voltage detection device for a rectifier cabinet, including a power module, an AC voltage transformer, a resistor and a high-voltage fuse. The power module is connected to the AC voltage transformer to supply power to the AC voltage transformer; the input end of the AC voltage transformer is connected to two phases of the incoming line voltage of the rectifier cabinet through two high-voltage fuses, the output end is connected to one end of the resistor, the other end of the resistor is grounded, and the two ends of the resistor are used to connect an oscilloscope, so as to obtain the waveform of the line voltage between the two phases of the incoming line voltage of the rectifier cabinet through the oscilloscope; the high-voltage fuse has an auxiliary contact, the auxiliary contact is connected to the rectifier cabinet, and is used to cut off the input of the incoming line voltage of the rectifier cabinet when the high-voltage fuse is blown. The present application solves the problem that in the process of measuring the incoming line voltage of the rectifier cabinet, the incoming line voltage is difficult to measure due to the high incoming line voltage and the incoming line voltage phase measurement is inaccurate.
[0038] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. It should be understood that the present application is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
Claims
1. A voltage detection device for a rectifier cabinet, characterized in that: It includes a power supply module, an AC voltage transformer, a resistor and a high-voltage fuse, wherein the power supply module is connected to the AC voltage transformer to supply power to the AC voltage transformer; The input end of the AC voltage transformer is connected to two phases of the incoming line voltage of the rectifier cabinet through the two high-voltage fuses, and the output end is connected to one end of the resistor, the other end of the resistor is grounded, and the two ends of the resistor are used to connect to an oscilloscope, so as to obtain the waveform of the line voltage between the two phases of the incoming line voltage of the rectifier cabinet through the oscilloscope; The high-voltage fuse has an auxiliary contact, which is connected to the rectifier cabinet and is used to cut off the input of the incoming line voltage of the rectifier cabinet when the high-voltage fuse blows.
2. The voltage detection device for a rectifier cabinet according to claim 1, characterized in that: The power module has a grounding point, and the other end of the resistor is connected to the grounding point of the power module to be grounded.
3. The voltage detection device for a rectifier cabinet according to claim 1, characterized in that: The number of the AC voltage transformers and the number of the resistors are both two, and the number of the high-voltage fuses is four. One AC voltage transformer, one resistor and two high-voltage fuses correspond to the R phase and S phase of the incoming line voltage of the rectifier cabinet, and another AC voltage transformer, another resistor and another two high-voltage fuses correspond to the T phase and S phase of the incoming line voltage of the rectifier cabinet.
4. The voltage detection device for a rectifier cabinet according to claim 1, characterized in that: The voltage detection device also includes an alarm device, and the alarm device is connected to the power module.
5. The voltage detection device for a rectifier cabinet according to claim 4, characterized in that: The alarm device is an audible and visual alarm lamp.
6. The voltage detection device for a rectifier cabinet according to claim 1, characterized in that: The model of the AC voltage transformer is DV4200 / SP4 produced by LEM.
7. The voltage detection device for a rectifier cabinet according to claim 6, characterized in that: The power supply module is used to convert the mains power into direct current output, so as to supply power to the AC voltage transformer.
8. The voltage detection device for a rectifier cabinet according to claim 1, characterized in that: The voltage detection device also includes a high-voltage cable, the input end of the AC voltage transformer is connected to one end of the high-voltage fuse through the high-voltage cable, and the other end of the high-voltage fuse inputs the incoming line voltage of the rectifier cabinet through the high-voltage cable.
9. The voltage detection device for a rectifier cabinet according to claim 1, characterized in that: The voltage detection device also includes an insulating plate, and the power module, the AC voltage transformer, the resistor and the high-voltage fuse are all arranged on the insulating plate.
10. The voltage detection device for a rectifier cabinet according to claim 1, characterized in that: The voltage detection device also includes a voltmeter connected to both ends of the resistor.