CN216900861U - Voltage sag detection and restart device - Google Patents
Voltage sag detection and restart device Download PDFInfo
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- CN216900861U CN216900861U CN202121057133.4U CN202121057133U CN216900861U CN 216900861 U CN216900861 U CN 216900861U CN 202121057133 U CN202121057133 U CN 202121057133U CN 216900861 U CN216900861 U CN 216900861U
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- 238000001514 detection method Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 claims description 11
- 101100408454 Arabidopsis thaliana PLC6 gene Proteins 0.000 description 6
- 101100408456 Arabidopsis thaliana PLC8 gene Proteins 0.000 description 6
- 101100408457 Arabidopsis thaliana PLC9 gene Proteins 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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Abstract
The utility model relates to the technical field of electrical control, in particular to a voltage sag detection and restart device, wherein one end of a first voltage reduction current-limiting resistor is connected to the L end of a detected power supply, the other end of the first voltage reduction current-limiting resistor is connected with one end of a second voltage reduction current-limiting resistor and one alternating current input end of a bridge rectifier, the other end of the second voltage reduction current-limiting resistor is connected to the N end of the detected power supply and the other alternating current input end of the bridge rectifier, the cathode of the bridge rectifier is connected to the anode input end of a photoelectric coupler, the anode of the bridge rectifier is connected to the cathode input end of the photoelectric coupler, the voltage sag detection and restart device also comprises a PLC system, and the output end of the photoelectric coupler is connected to a digital quantity input point of the detection PLC. The utility model can not only detect the sag condition of the detected power supply, but also detect whether equipment trips in the circuit after the sag of the detected power supply, and can restart the trip equipment, thereby avoiding the influence of sag on normal production and ensuring the smooth production.
Description
Technical Field
The utility model relates to the technical field of electrical control, in particular to a voltage sag detection and restart device.
Background
The alternating current power supply used by people daily is more and more important in safety and reliability, but because various faults of an electrical system cause abnormal fluctuation of the power supply, and the power supply fluctuation of about 10ms can cause tripping and shutdown of sensitive equipment, the abnormal fluctuation of the alternating current power supply is quickly detected, and corresponding remedial control measures are taken according to a preset control program, so that the influence caused by the power supply fluctuation is reduced to the minimum.
When the alternating current takes place "temporarily drop", motor drive's equipment such as water pump in the circuit can take place to jump the machine, and then causes production interruption, influences normal production progress, still needs the workman to overhaul just can continue the operation after closing a floodgate.
The utility model patent with the prior art patent application number of 'CN 201911397670.0' entitled 'circuit for detecting AC power supply abnormity and method thereof' discloses a circuit for detecting AC power supply abnormity and method thereof, comprising a PLC, the PLC is connected with an external detection circuit which comprises a detected power supply, the L end of the detected power supply is respectively connected in series with a first voltage-reducing current-limiting resistor and a second voltage-reducing current-limiting resistor, the other end of the first voltage-reducing current-limiting resistor is connected with the anode of the first half-wave rectifier diode, the other end of the second voltage-reducing current-limiting resistor is connected with the cathode of the second half-wave rectifier diode, the cathode of the first half-wave rectifier diode is connected to a PLC digital input point of 0.4', the anode of the second half-wave rectifier diode is connected to a PLC digital input point '0.5', and the N end of the detected power supply is connected to a common end '2M' of the PLC digital input point; through the cooperation of the PLC digital input point and an external detection circuit, the abnormity of the alternating current power supply is rapidly detected.
However, the prior art does not solve the problem of how to restart the motor-driven equipment such as a water pump in a circuit after the motor-driven equipment trips when the 'sag' of the alternating current occurs.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a voltage sag detection and restart device which can detect the sag of an alternating current power supply and can restart motor-driven equipment such as a water pump in a circuit.
In order to solve the technical problem, the utility model provides a voltage sag detection and restart device, which comprises a detected power supply, a first voltage reduction current limiting resistor, a second voltage reduction current limiting resistor, a bridge rectifier and a photoelectric coupler, wherein the detected power supply is alternating current, the detected power supply comprises an L end and an N end, one end of the first voltage reduction current limiting resistor is connected to the L end of the detected power supply, the other end of the first voltage reduction current limiting resistor is connected with one end of the second voltage reduction current limiting resistor and one alternating current input end of the bridge rectifier, the other end of the second voltage reduction current limiting resistor is connected to the N end of the detected power supply and the other alternating current input end of the bridge rectifier, the cathode of the bridge rectifier is connected to the anode input end of the photoelectric coupler, the anode of the bridge rectifier is connected to the cathode input end of the photoelectric coupler, the voltage sag detection and restart device also comprises a PLC system, the PLC system comprises a detection PLC, the output end of the photoelectric coupler is connected with a digital quantity input point of the detection PLC.
Furthermore, the PLC system also comprises an intermediate relay and a process PLC, wherein one end of the intermediate relay is connected to the digital output end of the detection PLC, and the process PLC is connected to the other end of the intermediate relay.
Furthermore, the PLC system comprises an uninterruptible power supply and an alternating current-direct current converter, the input end of the uninterruptible power supply is connected with the mains supply, the output end of the uninterruptible power supply is connected to the input end of the alternating current-direct current converter, and the output end of the alternating current-direct current converter is connected to the detection PLC.
Further, the output voltage of the ac-dc converter is 24V dc.
The utility model has the beneficial effects that: first step-down current-limiting resistor one end is connected and is served by being detected power L, the one end of second step-down current-limiting resistor and a AC input end of bridge rectifier are connected to first step-down current-limiting resistor other end, the other end of second step-down current-limiting resistor is connected on being detected power N end and another AC input end with bridge rectifier, bridge rectifier's negative pole is connected on photoelectric coupler's positive pole input, bridge rectifier's positive pole is connected on photoelectric coupler's negative pole input, still including the PLC system, photoelectric coupler's output is connected on the digital quantity input point that detects PLC. The utility model can not only detect the sag condition of the detected power supply, but also detect whether equipment trips in the circuit after the sag of the detected power supply, and can restart the trip equipment, thereby avoiding the influence of sag on normal production and ensuring the smooth production.
Drawings
Fig. 1 is an electrical schematic of the present invention.
In the figure: 1. a first step-down current-limiting resistor; 2. a second step-down current-limiting resistor; 3. a bridge rectifier; 4. a photoelectric coupler; 5. an uninterruptible power supply; 6. an AC-DC converter; 7. an intermediate relay; 8. detecting the PLC; 9. and (5) a process PLC.
Detailed Description
As shown in figure 1, the voltage sag detection and restart device of the utility model comprises a detected power supply, a first step-down current-limiting resistor 1, a second step-down current-limiting resistor 2, a bridge rectifier 3 and a photoelectric coupler 4, wherein the detected power supply is alternating current, the detected power supply comprises an L end and an N end, one end of the first step-down current-limiting resistor 1 is connected with the L end of the detected power supply, the other end of the first step-down current-limiting resistor 1 is connected with one end of the second step-down current-limiting resistor 2 and one alternating current input end of the bridge rectifier 3, the other end of the second step-down current-limiting resistor 2 is connected with the N end of the detected power supply and the other alternating current input end of the bridge rectifier 3, the cathode of the bridge rectifier 3 is connected with the anode input end of the photoelectric coupler 4, the anode of the bridge rectifier 3 is connected with the cathode input end of the photoelectric coupler 4, and a PLC system is also included, the PLC system comprises a detection PLC8, and the output end of the photoelectric coupler 4 is connected to the digital quantity input point of the detection PLC 8.
Furthermore, the PLC system also comprises an intermediate relay 7 and a process PLC9, wherein one end of the intermediate relay 7 is connected to the digital quantity output end of the detection PLC8, and the process PLC9 is connected to the other end of the intermediate relay 7.
Further, the PLC system including uninterrupted power supply 5 and AC/ DC converter 6, 5 input ends of uninterrupted power supply are connected with the commercial power, 5 output ends of uninterrupted power supply are connected at 6 input ends of AC/DC converter, 6 output ends of AC/DC converter are connected on detecting PLC 8.
Further, the output voltage of the ac/dc converter 6 is dc 24V.
When the L end and the N end of a detected power supply are electrified, current passes through a first current-limiting voltage-reducing resistor 1 and a second current-limiting voltage-reducing resistor 2, alternating current voltage of a bridge rectifier 3 is taken from two ends of the second current-limiting voltage-reducing resistor 2, pulsating direct current output by the bridge rectifier 3 flows into the input end of a photoelectric coupler 4, and the pulsating switching value of the photoelectric coupler 4 is connected to the digital value input end of a detection PLC 8; the 50HZ pulse switching value change period is 20ms when the 50HZ pulse switching value change period is consistent with the power frequency alternating current; according to the detection requirement, the resistance values of the first current-limiting step-down resistor 1 and the second current-limiting resistor are set, the current flowing through the photoelectric coupler 4 is larger than or equal to the threshold current, the logic of the digital input point of the PLC8 is detected to be 1, the current flowing through the photoelectric coupler 4 is smaller than the threshold current, and the logic of the digital corresponding to the PLC8 is detected to be 0. In the PLC logic control program, judging the power supply abnormality according to the time length of the digital quantity logic change; criterion one is as follows: when the time that the input point logic of digital quantity is '0' exceeds the normal time value for 1-2ms, the voltage sag fault is judged, the detection PLC8 continues to continuously detect for 0.01-1s, when the time that the input point logic of digital quantity driven by the detected power supply is '0' is recovered to be normal, the detection PLC8 output module drives the intermediate relay 7 to pull in, the normally open point of the intermediate relay 7 is closed and keeps the pulse pull-in of 0.5s, and a voltage sag signal is sent to the process PLC 9; the process PLC9 can program and control the restarting of equipment for stopping due to voltage sag according to the requirement, for example, when detecting the voltage sag signal sent by the intermediate relay 7 and the power supply is recovered to normal within 0.01-1s, the trip equipment for stopping with abnormal instruction is judged at the same time, and the restarting instruction of the trip equipment is sent out through a logic instruction.
The utility model can not only detect the sag condition of the detected power supply, but also detect whether equipment trips in the circuit after the sag of the detected power supply, and can restart the trip equipment, thereby avoiding the influence of sag on normal production and ensuring the smooth production.
Claims (4)
1. A voltage sag detection and restart device, comprising: comprises a detected power supply, a first voltage-reducing current-limiting resistor (1), a second voltage-reducing current-limiting resistor (2), a bridge rectifier (3) and a photoelectric coupler (4), wherein the detected power supply is alternating current, the detected power supply comprises an L end and an N end, one end of the first voltage-reducing current-limiting resistor (1) is connected to the L end of the detected power supply, the other end of the first voltage-reducing current-limiting resistor (1) is connected with one end of the second voltage-reducing current-limiting resistor (2) and one alternating current input end of the bridge rectifier (3), the other end of the second voltage-reducing current-limiting resistor (2) is connected to the N end of the detected power supply and the other alternating current input end of the bridge rectifier (3), the cathode of the bridge rectifier (3) is connected to the anode input end of the photoelectric coupler (4), the anode of the bridge rectifier (3) is connected to the cathode input end of the photoelectric coupler (4), and the PLC system is further included, the PLC system comprises a detection PLC (8), and the output end of the photoelectric coupler (4) is connected to a digital quantity input point of the detection PLC (8).
2. A voltage sag detection and restart apparatus, as claimed in claim 1, wherein: the PLC system further comprises an intermediate relay (7) and a process PLC (9), one end of the intermediate relay (7) is connected to the digital quantity output end of the detection PLC (8), and the process PLC (9) is connected to the other end of the intermediate relay (7).
3. A voltage sag detection and restart apparatus, as claimed in claim 2, wherein: the PLC system comprises an uninterruptible power supply (5) and an alternating current-direct current converter (6), wherein the input end of the uninterruptible power supply (5) is connected with a mains supply, the output end of the uninterruptible power supply (5) is connected to the input end of the alternating current-direct current converter (6), and the output end of the alternating current-direct current converter (6) is connected to a detection PLC (8).
4. A voltage sag detection and restart apparatus, as claimed in claim 3, wherein: the output voltage of the alternating current-direct current converter (6) is direct current 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121057133.4U CN216900861U (en) | 2021-05-18 | 2021-05-18 | Voltage sag detection and restart device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121057133.4U CN216900861U (en) | 2021-05-18 | 2021-05-18 | Voltage sag detection and restart device |
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| CN216900861U true CN216900861U (en) | 2022-07-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253144A (en) * | 2021-05-18 | 2021-08-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Voltage sag detection and restart device and application method thereof |
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2021
- 2021-05-18 CN CN202121057133.4U patent/CN216900861U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253144A (en) * | 2021-05-18 | 2021-08-13 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Voltage sag detection and restart device and application method thereof |
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