Anti-interference electricity device

Abstract

The utility model discloses an anti-interference electricity device comprising a voltage detection module, an interference electricity determination and control module connected with the voltage detection module, and a power supply module electrically connected with the interference electricity determination and control module. The voltage detection module is used for setting detection points on three sides of an output bus ABC of a transformer, and each detection point is provided with a detection relay and a voltage sensor. The interference electricity judgment and control module comprises an analog quantity input module connected with the voltage sensor, and the analog quantity input module is connected with a PLC (Programmable Logic Controller) connected with the detection relay; and the power supply module comprises a direct supply power supply circuit for electrically connecting the transformer with the PLC controller and a UPS power supply circuit which is connected in parallel with the direct supply power supply circuit to realize electrical connection with the PLC controller. According to the utility model, timely detection can be carried out when voltage sag occurs, and orderly operation recovery of electric equipment after voltage sag can be ensured, so that the reliability and stability of a power supply system can be improved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment protection technology, specifically to an anti-voltage fluctuation device. Background Technology

[0002] In industrial production, various factors such as lightning strikes, short-circuit fault reclosing, internal and external power grid failures, and the start-up of large equipment can cause the effective value of the power supply voltage to drop rapidly to 90% - 10% of the rated value, lasting between 10ms and 1 minute. This phenomenon is called voltage flicker. Voltage flicker can cause some voltage-sensitive equipment to stop working, affecting normal production, causing economic losses, and even triggering related accidents. Existing anti-voltage flicker measures have some shortcomings, such as low reliability, inability to meet the start-up time requirements of different equipment, and inability to effectively cope with complex power grid faults. Therefore, a more complete and reliable anti-voltage flicker device is needed to solve these problems. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an anti-power fluctuation device that can detect power fluctuations in a timely manner and ensure that electrical equipment can resume operation in an orderly manner after the power fluctuation, thereby improving the reliability and stability of the power supply system.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0005] The anti-voltage fluctuation device includes a voltage detection module, a voltage fluctuation judgment and control module connected to the voltage detection module, and a power supply module electrically connected to the voltage fluctuation judgment and control module.

[0006] The voltage detection module is used to set detection points on the three sides of the transformer output bus ABC respectively. Each detection point is equipped with a detection relay and a voltage sensor for real-time detection of the bus voltage status.

[0007] The power fluctuation detection and control module includes an analog input module connected to a voltage sensor to receive the bus voltage signal value. The analog input module is connected to a detection relay to determine whether a power fluctuation has occurred based on the received bus voltage signal value or whether the detection relay coil de-energizes and actuates its contacts. The PLC controller then issues reset and start commands as required for equipment that was running continuously before the power fluctuation and stopped running after the power fluctuation.

[0008] The power supply module includes a direct power supply circuit that electrically connects the transformer to the PLC controller, and a UPS power supply circuit that is connected in parallel with the direct power supply circuit to achieve electrical connection with the PLC controller.

[0009] Preferably, the PLC controller is a Siemens S7-200 SMART CPU ST60, and the input terminal of the PLC controller is also connected to the electrical equipment for communication to collect the status of the electrical equipment.

[0010] Preferably, the output terminal of the PLC controller is connected to an intermediate relay in parallel with the start button of the electrical equipment.

[0011] Preferably, the PLC controller is connected to an expansion module for expanding the number of digital I / O points of the PLC controller, and the expansion module is EMDT32.

[0012] Preferably, the analog input module is a Siemens S7-200 SMART EMAE08, and an AC voltage transmitter is provided between the analog input module and the voltage sensor, and between the detection relay and the PLC controller.

[0013] Preferably, the PLC controller is connected to a touch screen for parameter setting and operation interface display.

[0014] Preferably, the direct power supply circuit includes a first switching power supply connected between the transformer and the PLC controller; the UPS power supply circuit includes a UPS and a second switching power supply connected in parallel with the first switching power supply, and the UPS and the second switching power supply are connected in series.

[0015] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0016] This invention, by setting detection points and status monitoring equipment on the three-phase busbar side, can comprehensively, timely and accurately detect the voltage status on the busbar, thereby quickly identifying voltage fluctuations.

[0017] This invention significantly improves the reliability of the device under power fluctuations and other fault conditions by adopting a dual power supply method that combines a direct power supply circuit and a UPS power supply circuit in parallel. This enhances the anti-interference capability and reduces the probability of malfunctions and failures to operate.

[0018] This utility model has the functions of monitoring the status of electrical equipment, accurately judging power fluctuations, and automatically resetting and starting. It can realize the automated control of power fluctuation response, greatly reduce the downtime caused by power fluctuations, ensure the continuity of production and operation, effectively reduce economic losses caused by power fluctuations, and avoid related accidents. Attached Figure Description

[0019] Figure 1 This is the circuit diagram of this utility model;

[0020] Figure 2 This is the circuit diagram of the PLC controller of this utility model;

[0021] Figure 3 This is a circuit diagram of the analog input module of this utility model;

[0022] Figure 4 This is a circuit diagram of the expansion module of this utility model. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] A device for preventing voltage flickering, combined with Figure 1 As shown, the device includes a voltage detection module, a power fluctuation detection and control module, and a power supply module. The voltage detection module is used to detect power fluctuations. The output of the voltage detection module is connected to the input of the power fluctuation detection and control module, thereby sending a detection signal to the power fluctuation detection and control module. The power fluctuation detection and control module determines whether a power fluctuation has occurred based on the signal sent by the voltage detection module and controls the electrical equipment according to the determination result. The output of the power supply module is electrically connected to the power fluctuation detection and control module, and the power fluctuation detection and control module is electrically connected to the voltage detection module and the electrical equipment. The power supply module is used to supply power to the device and to supply power to the electrical equipment through the device when a power fluctuation occurs.

[0025] The voltage detection module is used to set detection points on the three sides (A, B, and C) of the transformer output bus. Each detection point is equipped with a detection relay and a voltage sensor. The detection relay and voltage sensor are used to detect the bus voltage status in real time, thereby achieving dual detection of voltage fluctuations. The detection relay, for example... Figure 1 The numbers KAJ1, KAJ2, KAJ3, KAJ4, KAJ5, and KAJ6 are listed.

[0026] The voltage fluctuation detection and control module includes a PLC controller and an analog input module.

[0027] like Figure 3 As shown, the analog input module is a Siemens S7-200 SMART EMAE08. The analog input module is connected to the voltage sensor to receive the bus voltage signal value.

[0028] The input terminals of the PLC controller are connected to the output terminals of the analog input module. The PLC controller is also connected to a detection relay to receive the bus voltage signal or to detect whether the relay's coil has lost power and its contacts have activated. For example... Figure 2As shown, the PLC controller is a Siemens S7-200 SMART CPU ST60. The PLC controller's input terminals are also connected to the electrical equipment for communication, thereby collecting the equipment's operating status and fault information. An intermediate relay is connected to the PLC controller's output terminals, and this intermediate relay is connected in parallel with the equipment's start button to ensure safe equipment startup. If the PLC controller detects that the bus voltage is 20% lower than the rated voltage or detects the de-energized relay coil contact, it determines that a voltage fluctuation has occurred and issues reset and start commands as required for equipment that was running continuously before the voltage fluctuation and stopped running afterward.

[0029] An AC voltage transmitter is also installed between the analog input module and the voltage sensor, and between the detection relay and the PLC controller. The AC voltage transmitter is used to convert the voltage signal detected by the voltage sensor and the action signal sent by the detection relay to meet the input requirements of the analog input module and the PLC controller.

[0030] like Figure 4 The PLC controller shown is also connected to an expansion module, namely EMDT32, which is used to expand the number of digital I / O points of the PLC controller so that the PLC controller can connect to more electrical devices.

[0031] The PLC controller is connected to a touchscreen, which is used for parameter setting and operation interface display, thus realizing human-machine interaction. When the same device controls multiple electrical devices, the timing is the same, the parameters are set individually, and they are independent of each other to ensure the reliability of the start-up time of each electrical device. At the same time, under the condition of ensuring the safe inrush current of the transformer, the electrical devices are started in batches. The equipment protection time and start-up time can be flexibly set to avoid the impact of motor back EMF.

[0032] The power supply module includes a direct power supply circuit and a UPS power supply circuit. The UPS power supply circuit is used to electrically connect the transformer to the PLC controller. Specifically, the direct power supply circuit includes a first switching power supply, such as... Figure 1 In the PLC controller, PS1 is the first switching power supply connected between the transformer and the PLC controller. The UPS power supply circuit is connected in parallel with the direct power supply circuit, thereby achieving electrical connection with the PLC controller. Specifically, the UPS power supply circuit includes a UPS connected in parallel with the first switching power supply and a second switching power supply, such as... Figure 1 The PS2 in the circuit is connected in series with the UPS and the second switching power supply. This power supply method enables two power sources to supply power simultaneously, thereby improving the reliability and stability of the device's power supply and avoiding the failure of the power fluctuation detection and control module due to a single power supply line failure.

[0033] In use, the voltage detection module monitors the bus voltage in real time and transmits the detection signal to the power fluctuation judgment and control module. Once a power fluctuation occurs, the module quickly makes a judgment. For electrical equipment that was running continuously before the fluctuation and stopped running afterward, the PLC controller issues reset and start commands according to preset requirements, controlling the restart of the equipment via an intermediate relay at the output terminal. Throughout the process, the power supply module provides stable power support to the power fluctuation judgment and control module, ensuring the normal operation of the device.

Claims

1. An anti-voltage fluctuation device, characterized in that: It includes a voltage detection module, a voltage fluctuation detection and control module connected to the voltage detection module, and a power supply module electrically connected to the voltage fluctuation detection and control module; The voltage detection module is used to set detection points on the three sides of the transformer output bus ABC respectively. Each detection point is equipped with a detection relay and a voltage sensor for real-time detection of the bus voltage status. The power fluctuation detection and control module includes an analog input module connected to a voltage sensor to receive the bus voltage signal value. The analog input module is connected to a detection relay to determine whether a power fluctuation has occurred based on the received bus voltage signal value or whether the detection relay coil de-energizes and actuates its contacts. The PLC controller then issues reset and start commands as required for equipment that was running continuously before the power fluctuation and stopped running after the power fluctuation. The power supply module includes a direct power supply circuit that electrically connects the transformer to the PLC controller, and a UPS power supply circuit that is connected in parallel with the direct power supply circuit to achieve electrical connection with the PLC controller.

2. The anti-power fluctuation device according to claim 1, characterized in that: The PLC controller is a Siemens S7-200SMART CPU ST60. The input terminals of the PLC controller are also connected to the electrical equipment to collect the status of the electrical equipment.

3. The anti-voltage fluctuation device according to claim 2, characterized in that: The output terminal of the PLC controller is connected to an intermediate relay in parallel with the start button of the electrical equipment.

4. The anti-voltage fluctuation device according to claim 2, characterized in that: The PLC controller is connected to an expansion module, namely EMDT32, for expanding the number of digital I / O points of the PLC controller.

5. The anti-voltage fluctuation device according to claim 2, characterized in that: The analog input module is a Siemens S7-200 SMART EMAE08. An AC voltage transmitter is installed between the analog input module and the voltage sensor, and between the detection relay and the PLC controller.

6. The anti-voltage fluctuation device according to claim 2, characterized in that: The PLC controller is connected to a touch screen for parameter setting and operation interface display.

7. The anti-voltage fluctuation device according to claim 1, characterized in that: The direct power supply circuit includes a first switching power supply connected between the transformer and the PLC controller; the UPS power supply circuit includes a UPS connected in parallel with the first switching power supply and a second switching power supply, and the UPS and the second switching power supply are connected in series.

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