Fault detection device for high-voltage frequency converter

Abstract

The utility model relates to the technical field of high-voltage frequency converters, in particular to a fault detection device for a high-voltage frequency converter, which is used for the high-voltage frequency converter and comprises a transformer, a power unit, a control unit, a power supply module and a sequential control module. The output ends of the high-voltage frequency converter and the transformer are connected to the power unit; the output end of the power unit is connected to the control unit, the output end of the control unit is connected to a first relay coil, the power module is connected to the transformer through a second relay normally-open contact, and the time sequence control module is electrically connected with the power module and the control unit. The objective of the utility model is to solve power transmission potential safety hazards caused by power transmission faults of a high-voltage frequency converter and explosion of an energy storage capacitor, so that power transmission of a power grid is safer.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage frequency converters, and in particular to a high-voltage frequency converter fault detection device. Background Art

[0002] A high-voltage inverter is a device used to adjust the speed of an electric motor. It controls the operation of the motor by changing the input voltage and frequency. High-voltage inverter control systems are widely used in industrial production and can achieve precise control and energy-saving operation of the motor.

[0003] However, high-voltage inverters present several technical challenges during operation. Due to the complex internal circuitry and high failure rate, a fault in a high-voltage inverter can cause grid power outages, disrupting normal production. Furthermore, the inverter's energy storage capacitors can accumulate charge during operation. If this short-circuit or explodes, it can pose a serious threat to equipment and personnel. To address this, we propose a high-voltage inverter fault detection device. Utility Model Content

[0004] The purpose of the utility model is to provide a high-voltage inverter fault detection device to solve the power transmission safety hazards caused by high-voltage inverter power transmission failure and energy storage capacitor explosion, making power transmission in the power grid safer.

[0005] To achieve the above-mentioned purpose, the present invention provides a high-voltage inverter fault detection device, which is used for a high-voltage inverter, including a transformer, a power unit, a control unit, a power module and a timing control module. The input end of the high-voltage inverter is connected to the transformer through the normally open contact of the first relay, and the output end of the high-voltage inverter and the output end of the transformer are connected to the power unit; the output end of the power unit is connected to the control unit, and the output end of the control unit is connected to the first relay coil. The power module is connected to the transformer through the normally open contact of the second relay, and the timing control module is electrically connected to the power module and the control unit.

[0006] Furthermore, the timing control module is used to receive a closing signal from the control unit, and the timing control module includes a timing control circuit.

[0007] Furthermore, the timing control circuit includes a timing control relay, which is connected in parallel with the first relay and the second relay.

[0008] Furthermore, the timing control relay includes a timing control relay coil and a timing control relay normally open contact. The timing control relay coil is connected in parallel with the first relay coil and the second relay coil. One end of the timing control relay coil is connected to the first terminal of the power module through the timing control relay normally open contact, and the other end of the timing control relay coil is connected to the second terminal of the power module. The timing control relay normally open contact is used to close when receiving the closing signal of the control unit.

[0009] Furthermore, the timing control relay also includes a delayed opening contact and a delayed closing contact, one end of the delayed opening contact is connected to the first terminal of the power module, and the other end of the delayed opening contact is connected to the second relay coil; one end of the delayed closing contact is connected to the first terminal of the power module, and the other end of the delayed closing contact is connected to the first relay coil.

[0010] Furthermore, the transformer is a phase-shifting transformer.

[0011] Furthermore, a fault detection device is provided in the power unit, and the fault detection device at least includes a temperature sensor, an overcurrent protection device, an overvoltage protection device, and a short-circuit protection device.

[0012] Furthermore, an alarm device is included, which is electrically connected to the control unit. The alarm device is used to send an alarm signal when the control unit receives a power unit output fault signal.

[0013] The beneficial effects of the utility model include:

[0014] 1. The high-voltage inverter fault detection device provided by the present invention uses a transformer, a power unit, a control unit and a power module. The power module is used for external power supply to simulate the operating environment of the high-voltage inverter, and the transformer is used as a boosting device to obtain high-voltage power and transmit it to the power unit for fault detection. The control unit is used to detect the power unit warning signal. If the control unit receives the warning signal from the power unit, the power supply of the power grid is stopped to realize the control of the normally open contact of the first relay; the power unit is used to perform fault detection on the high-voltage inverter before the high-voltage inverter power grid is supplied, thereby avoiding the impact of fault detection tripping on the power grid after the high-voltage inverter power grid is supplied, and preventing the occurrence of power supply failure; on the other hand, by setting the power module, the power module can charge the energy storage capacitors of the transformer and the power unit before the high-voltage inverter power grid is supplied, thereby reducing the closing current when the power grid is supplied, and preventing the risk of large current closing on the power grid causing impact and explosion of the energy storage capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of the circuit structure of a high-voltage inverter fault detection device provided by an embodiment of the utility model;

[0017] Figure 2 A schematic structural diagram of a high-voltage inverter fault detection device provided by an embodiment of the present utility model;

[0018] Icon: 100-transformer, 110-first relay normally open contact, 111-first relay coil, 200-power unit, 300-control unit, 400-power module, 410-second relay normally open contact, 411-second relay coil, 500-timing control relay coil, 510-timing control relay normally open contact, 520-delayed disconnect contact, 530-delayed closed contact. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. It should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the figures, or the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply 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 a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0021] See Figures 1 to 2As shown, at least one embodiment of the present disclosure provides a high-voltage inverter fault detection device for a high-voltage inverter, including a transformer 100, a power unit 200, a control unit 300, a power module 400 and a timing control module. The high-voltage inverter input end is connected to the transformer 100 through the first relay normally open contact 110, and the high-voltage inverter output end and the transformer 100 output end are connected to the power unit 200; the power unit 200 output end is connected to the control unit 300, and the control unit 300 output end is connected to the first relay coil 111. The power module 400 is connected to the transformer 100 through the second relay normally open contact 410. The timing control module is electrically connected to the power module 400 and the control unit 300. Specifically, the power module 400 inputs a 380V power supply and converts it into a 10KV power supply, and then uses the transformer 100 as a boost device to obtain a high voltage voltage. At this time, the control unit 300 is configured to control the IGBT (insulated gate bipolar transistor) in the power unit 200 to stop outputting power through a corresponding signal output; the IGBT is a key component in the power unit 200. , a switch for controlling current and voltage, the control unit 300 turns off the IGBT output, that is, stops the power unit 200 from outputting power; the existing power unit 200 usually has a built-in fault detection function. At this time, the control unit 300 is used to detect the early warning signal issued by the power unit 200. If the early warning signal is received, a fault signal is issued to stop the power supply program; the control unit 300 can adopt an existing microcontroller or PLC controller to realize the monitoring and control of the power unit 200 and the control of the first relay; in this embodiment, the model of the transformer 100 is: ZCSG-1600 / 10-24, the model of the power unit 200 is: RX-PU-690 / 120, and the model of the control unit 300 is 7820H310-A03a0n4; it should be noted that the control programs of the control unit 300, power unit 200, power module 400, relay, etc. in the present invention are all mature conventional technologies in the prior art. Those skilled in the art can realize the application of the present invention based on the principle of the same function in the prior art. This program part is not the innovation point of the present invention.

[0022] The high-voltage inverter fault detection device provided by the present invention uses a transformer 100, a power unit 200, a control unit 300 and a power module 400. The power module 400 is used for external power supply to simulate the operating environment of the high-voltage inverter. The transformer 100 is used as a boosting device to obtain high-voltage power and transmit it to the power unit 200 for fault detection. The control unit 300 is used to detect the warning signal of the power unit 200. If the control unit 300 receives the warning signal from the power unit 200, the power supply of the power grid is stopped to realize the control of the normally open contact 110 of the first relay; the power unit 200 is used to perform fault detection on the high-voltage inverter before the high-voltage inverter power grid is supplied, thereby avoiding the impact of fault detection tripping on the power grid after the high-voltage inverter power grid is supplied, and preventing the occurrence of power supply failure; on the other hand, by providing the power module 400, the power module 400 can charge the energy storage capacitors of the transformer 100 and the power unit 200 before the high-voltage inverter power grid is supplied, thereby reducing the closing current when the power grid is supplied, preventing the impact of large current closing on the power grid and the risk of explosion of the energy storage capacitor;

[0023] Preferably, the timing control module is used to receive a closing signal from the control unit 300, the timing control module includes a timing control circuit, the timing control circuit includes a timing control relay, and the timing control relay is connected in parallel with the first relay and the second relay; specifically, the control unit 300 monitors the operating status of the system, and when no fault warning signal is detected, it generates a closing signal to control the first relay to start power transmission from the power grid; the timing control module receives the closing signal from the control unit 300 and starts the timing control circuit. After the timing control circuit completes the action, the power supply module 400 stops power transmission and the power grid starts power transmission;

[0024] Preferably, the timing control relay includes a timing control relay coil 500 and a timing control relay normally open contact 510, the timing control relay coil 500 is connected in parallel with the first relay coil 111 and the second relay coil 411, one end of the timing control relay coil 500 is connected to the first terminal of the power module 400 through the timing control relay normally open contact 510, and the other end of the timing control relay coil 500 is connected to the second terminal of the power module 400, and the timing control relay normally open contact 510 is used to close when receiving the closing signal of the control unit 300; the timing control relay also includes a delayed opening contact 520 and The delayed closing contact 530 and the delayed opening contact 520 are connected to the first terminal of the power module 400, and the other end of the delayed opening contact 520 is connected to the second relay coil 411. One end of the delayed closing contact 530 is connected to the first terminal of the power module 400, and the other end of the delayed closing contact 530 is connected to the first relay coil 111. Specifically, the delayed opening contact 520 is used to delay opening the second relay coil 411 upon receiving a closing signal, thereby stopping the power supply of the power module 400. The delayed closing contact 530 is used to delay closing the first relay coil 111 upon receiving a closing signal, thereby allowing the external power grid to supply power to the transformer 100.

[0025] Preferably, the transformer 100 adopts a phase-shifting transformer, which can realize the phase-shifting operation of the voltage, which can help improve the power factor and efficiency of the system, reduce harmonic interference, and improve the stability and reliability of the system; on the other hand, the phase-shifting transformer can help the system respond to control signals faster, realize faster switching actions, and improve the response speed of the system.

[0026] Preferably, a fault detection device is provided in the power unit 200, and the fault detection device includes at least a temperature sensor, an overcurrent protection device, an overvoltage protection device, and a short-circuit protection device; specifically, the temperature sensor is used to monitor the temperature change inside the power unit 200, and once the temperature exceeds a set threshold, a fault signal is issued; the overcurrent protection device is used to monitor the output current of the power unit 200, and once an overcurrent exceeding the rated value is detected, the power supply can be promptly cut off and a fault signal is issued; the overvoltage protection device is used to monitor the output voltage of the power unit 200, and once an overvoltage exceeding the rated value is detected, a fault signal can be issued; the short-circuit protection device is used to detect a short circuit at the output end of the power unit 200, and once a short circuit occurs, a fault signal can be issued; the temperature sensor, the overcurrent protection device, the overvoltage protection device, and the short-circuit protection device are all existing conventional fault detection modules;

[0027] Preferably, an alarm device is also included, which is electrically connected to the control unit 300. The alarm device is used to send an alarm signal when the control unit 300 receives a fault signal output by the power unit 200; specifically, the alarm signal can be an audible and visual alarm signal. The issuance of the alarm signal can help the operator quickly locate the fault site and quickly handle the fault.

[0028] In addition to the above description, the following points need to be explained:

[0029] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0030] (2) The power transmission program, fault detection and other control programs disclosed in this disclosure are all mature conventional technologies in the prior art. Those skilled in the art can implement the application of this utility model based on the principles of the same functions in the prior art. This program part is not the innovative point of this utility model;

[0031] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0032] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A high-voltage inverter fault detection device, used for a high-voltage inverter, characterized in that: The invention comprises a transformer (100), a power unit (200), a control unit (300), a power module (400) and a timing control module. The input end of the high-voltage frequency converter is connected to the transformer (100) via a first relay normally open contact (110). The output end of the high-voltage frequency converter and the output end of the transformer (100) are connected to the power unit (200). The output end of the power unit (200) is connected to the control unit (300). The output end of the control unit (300) is connected to the first relay coil (111). The power module (400) is connected to the transformer (100) via a second relay normally open contact (410). The timing control module is electrically connected to the power module (400) and the control unit (300).

2. The high-voltage inverter fault detection device according to claim 1, characterized in that: The timing control module is used to receive a closing signal from the control unit (300), and the timing control module includes a timing control circuit.

3. The high-voltage inverter fault detection device according to claim 2, characterized in that: The timing control circuit includes a timing control relay, which is connected in parallel with the first relay and the second relay.

4. The high-voltage inverter fault detection device according to claim 3, characterized in that: The timing control relay comprises a timing control relay coil (500) and a timing control relay normally open contact (510); the timing control relay coil (500) is connected in parallel with a first relay coil (111) and a second relay coil (411); one end of the timing control relay coil (500) is connected to a first terminal of a power module (400) via the timing control relay normally open contact (510); the other end of the timing control relay coil (500) is connected to a second terminal of the power module (400); and the timing control relay normally open contact (510) is used to close upon receiving a closing signal from a control unit (300).

5. The high-voltage inverter fault detection device according to claim 4, characterized in that: The timing control relay further comprises a delayed opening contact (520) and a delayed closing contact (530), wherein one end of the delayed opening contact (520) is connected to the first terminal of the power module (400), and the other end of the delayed opening contact (520) is connected to the second relay coil (411); one end of the delayed closing contact (530) is connected to the first terminal of the power module (400), and the other end of the delayed closing contact (530) is connected to the first relay coil (111).

6. The high-voltage inverter fault detection device according to claim 1, characterized in that: The transformer (100) is a phase-shifting transformer.

7. The high-voltage inverter fault detection device according to any one of claims 1 to 6, characterized in that: A fault detection device is provided in the power unit (200), and the fault detection device comprises at least a temperature sensor, an overcurrent protection device, an overvoltage protection device, and a short-circuit protection device.

8. The high-voltage inverter fault detection device according to claim 7, characterized in that: It also includes an alarm device, which is electrically connected to the control unit (300) and is used for the control unit (300) to send an alarm signal when receiving a fault signal output by the power unit (200).

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