CN115469219A - On-load tap-changer monitoring device, method, equipment and storage medium - Google Patents
On-load tap-changer monitoring device, method, equipment and storage medium Download PDFInfo
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- CN115469219A CN115469219A CN202211118450.1A CN202211118450A CN115469219A CN 115469219 A CN115469219 A CN 115469219A CN 202211118450 A CN202211118450 A CN 202211118450A CN 115469219 A CN115469219 A CN 115469219A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
Abstract
The invention discloses an on-load tap-changer monitoring device, a method, equipment and a storage medium, wherein the device comprises a position sensor, a current sensor and an information acquisition processor, the position sensor is arranged on a transmission component of an on-load tap-changer and is used for detecting action information of a switching knife switch of the on-load tap-changer, the current sensor is arranged in a power electronic component of the on-load tap-changer and a loop of the switching switch and is used for detecting current information of the power electronic component, and the information acquisition processor is used for receiving the action information and the current information and outputting the action information and the current information. According to the on-load tap-changer monitoring device, the position sensor is mounted on the transmission assembly, the current sensors are arranged in the power electronic assembly and the loop of the change-over switch, the action information of the change-over switch and the current information of the power electronic assembly can be monitored in real time, the mounting position is reasonable, and the monitoring of the internal information of the on-load tap-changer is facilitated.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a device, a method and equipment for monitoring an on-load tap-changer and a storage medium.
Background
An On-load tap changer (OLTC) is a core component of a power transformer for completing voltage regulation. The on-load voltage regulation technology of the transformer is an important means for stabilizing voltage, namely, under the condition of no power failure, the on-load tap changer switches the transformer from one tap to another tap to regulate the effective number of turns of a transformer winding so as to achieve the purpose of voltage regulation. Currently, there are two technical routes of an on-load tap-changer, namely a mechanical route and an electronic power route. The power electronics technology mainly includes two routes of pure power electronics and mechanical power electronics hybrid. The pure power electronic on-load tap-changer is adopted to replace a mechanical switch, the switching process is arc-free, the action is rapid, but the number of used power electronic devices is large, the manufacturing cost is high, extra water cooling equipment is required to be configured for long-term through-flow of the power electronic devices, the loss is large, and the reliability is low. The pure power electronic on-load tap-changer is in a theoretical research stage. Mechanical and power electronic mixed on-load tap-changer is adopted, and a semi-controlled power electronic component replaces a mechanical change-over switch, so that the arcing in the switching process is small, and the service life of the on-load tap-changer is prolonged.
At present, the internal operation state of the on-load tap-changer of the transformer cannot be monitored, the whole mechanism of the conventional mechanical on-load tap-changer is completely immersed in transformer oil, particularly a high-voltage transformer, hundreds of kilovolts exist in the voltage to ground, and the electric signal quantity cannot be directly measured in real time; the mechanical knife switch action of the tapping switch is pushed after the energy is stored by a spring, the spring energy storage is driven by a motor, and the accurate moment of the knife switch action cannot be judged according to the motor action. Operation and maintenance personnel cannot know the internal operation state of the tap changer in real time, the operation condition of the on-load tap changer is directly related to the operation safety of the on-load tap changing transformer, and due to the transformer fire accident caused by the transformer on-load tap changer fault, casualties and major equipment loss are easy to cause, and the problem of on-load tap changer on-line monitoring in the operation state is urgently needed to be solved.
In the prior art, a Hall sensor is additionally arranged at a coil of a tap switch driving motor, a vibration acceleration sensor is additionally arranged on a tap switch contact, and an angular displacement sensor is fixedly arranged on a tap switch driving motor shaft. The force accumulation time of the trigger spring is in the second level (generally 2S-6S), and the spring cannot accurately control the trigger time due to individual difference, so that the displacement-time curve and the total stroke of the on-load tap-changer cannot be accurately given in the practical application process, and therefore, the problem that the sensor is unreasonable to install exists in the prior art.
Disclosure of Invention
In view of this, embodiments of the present invention provide an on-load tap changer monitoring device, method, device, and storage medium, so as to solve the technical problem that the existing monitoring device is unreasonable in installation.
The technical scheme provided by the invention is as follows:
a first aspect of an embodiment of the present invention provides an on-load tap-changer monitoring device, which is applied to a power electronic mechanical hybrid on-load tap-changer, and includes: the position sensor is arranged on a transmission component of the on-load tap-changer and is used for detecting the action information of a switching knife switch of the on-load tap-changer; the current sensor is arranged in a loop of a power electronic component of the on-load tap-changer and a selector switch and is used for detecting current information of the power electronic component; and the information acquisition processor is respectively connected with the position sensor and the current sensor and is used for receiving the action information and the current information and outputting the action information and the current information.
Optionally, the transmission assembly includes a first transmission rod and a second transmission rod, the first transmission rod is disposed in the on-load tap-changer and connected to the switching knife-switch, one end of the second transmission rod is connected to the first transmission rod, the other end of the second transmission rod penetrates through the housing of the on-load tap-changer and is connected to the position sensor, and the second transmission rod is connected to the housing of the on-load tap-changer in a rotating and sealing manner.
Optionally, the position sensor includes a light source emitter, a light source receiver and a blocking piece, the blocking piece is connected with the second transmission rod and coaxially rotates with the second transmission rod, the light source emitter and the light source receiver are respectively arranged on the upper side and the lower side of the blocking piece, the blocking piece is provided with at least two light holes, when the switching knife switch is closed, the light source emitter, the light holes and the light source receiver form a light source path, the light source emitter is used for emitting a light signal, and the light source receiver is used for detecting whether the light signal is received.
Optionally, the middle part of stopping the piece is equipped with the fixed orifices, stop the piece pass through the fixed orifices with the second transfer line joint.
Optionally, the on-load tap-changer monitoring device further includes a control unit, one end of the control unit is connected to the light source receiver, the other end of the control unit is connected to the information acquisition processor, and when the light source receiver does not receive the optical signal, the control unit sends the action information to the information acquisition processor.
Optionally, the on-load tap-changer monitoring device further includes a voltage sensor, two detection ends of the voltage sensor are respectively connected with two ends of the power electronic component, and an output end of the voltage sensor is connected with the information acquisition processor.
Optionally, the on-load tap-changer monitoring device further comprises a state monitoring display, and the state monitoring display is connected with the information acquisition processor and used for displaying action information and current information.
A second aspect of the embodiments of the present invention provides an on-load tap-changer monitoring method applied to an on-load tap-changer monitoring apparatus according to the first aspect of the embodiments of the present invention, including: acquiring action information of a switching knife switch of the on-load tap-changer and current information of the power electronic component; and judging whether the on-load tap-changer is abnormal or not according to the interval between the starting time of the action information and the starting time of the current information and/or whether the interval between the ending time of the action information and the ending time of the current information is smaller than a preset current out-of-limit protection threshold or not.
Optionally, determining whether the on-load tap-changer is abnormal according to whether an interval between a start time of the action information and a start time of the current information and/or an interval between an end time of the action information and an end time of the current information is smaller than a preset current out-of-limit protection threshold, including: respectively comparing whether the interval between the starting time of the action information and the starting time of the current information is smaller than a first out-of-limit protection threshold and a second out-of-limit protection threshold, when the interval between the starting time of the action information and the starting time of the current information is smaller than the first out-of-limit protection threshold, sending a first type of abnormal warning, and when the interval between the starting time of the action information and the starting time of the current information is smaller than the second out-of-limit protection threshold, sending a second type of abnormal warning, wherein the first out-of-limit protection threshold is larger than the second out-of-limit protection threshold; and/or respectively comparing whether the interval between the ending time of the action information and the ending time of the current information is smaller than a third out-of-limit protection threshold and a fourth out-of-limit protection threshold, when the interval between the ending time of the action information and the ending time of the current information is smaller than the third out-of-limit protection threshold, sending a first type of abnormal warning, and when the interval between the ending time of the action information and the ending time of the current information is smaller than the fourth out-of-limit protection threshold, sending a second type of abnormal warning, wherein the third out-of-limit protection threshold is larger than the fourth out-of-limit protection threshold.
Optionally, the on-load tap changer monitoring method further comprises: the method comprises the steps of obtaining voltage information of the power electronic assembly, and judging whether an on-load tap-changer is abnormal or not according to whether the voltage information is larger than a preset overvoltage protection threshold or not.
A third aspect of embodiments of the present invention provides an electronic device, including: a memory and a processor, the memory and the processor being communicatively coupled to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the on-load tap-changer monitoring method according to the second aspect of the embodiment of the present invention.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the on-load tap-changer monitoring method according to the second aspect of embodiments of the present invention.
According to the technical scheme, the embodiment of the invention has the following advantages:
the embodiment of the invention provides an on-load tap-changer monitoring device, method, equipment and a storage medium, wherein the device comprises a position sensor, a current sensor and an information acquisition processor, the position sensor is arranged on a transmission component of an on-load tap-changer and is used for detecting action information of a switching knife switch of the on-load tap-changer, the current sensor is arranged in a power electronic component of the on-load tap-changer and a loop of the switching switch and is used for detecting current information of the power electronic component, and the information acquisition processor is respectively connected with the position sensor and the current sensor and is used for receiving the action information and the current information and outputting the action information and the current information. According to the on-load tap-changer monitoring device, the position sensor is mounted on the transmission assembly, the current sensors are arranged in the power electronic assembly and the loop of the change-over switch, so that the action information of the change-over switch in the power electronic mechanical hybrid on-load tap-changer and the current information of the power electronic assembly can be monitored in real time, the mounting position is reasonable, and the monitoring of the internal information of the on-load tap-changer is facilitated.
Drawings
In order to more clearly express the technical scheme of the embodiment of the present invention, the drawings used in the description of the embodiment will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an on-load tap changer monitoring device in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electrical, electronic and mechanical hybrid on-load tap changer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a mechanical part of the power electronic mechanical hybrid on-load tap-changer according to an embodiment of the present invention;
FIG. 4 is an enlarged view of portion A of FIG. 3;
FIG. 5 is a schematic structural diagram of a blocking member according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a switch according to an embodiment of the present invention;
fig. 7 is a schematic view of an installation configuration of an on-load tap changer monitoring device according to another embodiment of the present invention;
fig. 8 is a schematic view of a topology of a power electronic mechanical hybrid on-load tap changer according to another embodiment of the present invention;
FIG. 9 is a schematic illustration showing monitored data under normal conditions in an embodiment of the present invention;
FIG. 10 is a schematic view showing monitoring data in a case of burning under another embodiment of the present invention;
fig. 11 is a flow chart of a method of monitoring an on-load tap changer in an embodiment of the present invention;
FIG. 12 is a schematic structural diagram of an electronic device according to an embodiment of the invention;
fig. 13 is a schematic structural diagram of a computer-readable storage medium according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an on-load tap-changer monitoring device, which is applied to an electric power electronic mechanical hybrid on-load tap-changer, and as shown in figure 1, the on-load tap-changer monitoring device comprises:
and the position sensor 403 is arranged on a transmission component of the on-load tap-changer and is used for detecting the action information of a switching knife switch of the on-load tap-changer. Specifically, the on-load tap-changer monitoring device provided by the embodiment of the invention is used for monitoring the power electronic mechanical hybrid on-load tap-changer. As shown in fig. 2, the power electronic mechanical hybrid on-load tap changer includes an electronic part and a mechanical part, the electronic part mainly includes power electronic components, and the mechanical part mainly includes a housing and a tap changer and a diverter switch inside the housing. The structure of the mechanical part is shown in fig. 3, and comprises a rotating shaft 1, a transmission assembly, a switching knife switch and a shell 14, wherein the left side of the rotating shaft 1 is connected with an external driving motor, if the internal switching knife switch is controlled to act, the external motor is started to drive the rotating shaft 1 at the bottom, so that the force is stored for an internal spring, and when the spring meets the energy storage requirement, the spring is released to drive the switching knife switch of the tap changer to act. The upper end of the transmission component penetrates through the housing 14 of the mechanical part, and the position sensor 403 is arranged at the part of the transmission component, which penetrates through the outside of the housing 14, and is used for monitoring the motion information of the rotation of the transmission component, so as to monitor the motion information of the switching knife switch.
And the current sensor 401 is arranged in a loop of the power electronic component and the change-over switch of the on-load tap-changer and is used for detecting current information of the power electronic component. Specifically, the current sensor employs a hall sensor, which is located in a loop of the power electronics assembly and the diverter switch. Specifically, a high-voltage cable is led out from a loop of the power electronic component and the change-over switch through a transformer insulating sleeve, so that a Hall sensor and a high-potential voltage sensor can be additionally arranged on the led-out loop. The hall current sensor 401 is used to monitor the operating current during tap changer switching.
And an information acquisition processor 402 respectively connected with the position sensor 403 and the current sensor 401, for receiving the motion information and the current information and outputting the motion information and the current information. Specifically, the information acquisition processor 402 includes an a/D conversion module, an I/O acquisition module, an information processing module, and a power supply module, where the a/D conversion module is an a/D converter and is configured to receive an analog signal acquired by the hall sensor, convert the analog signal into a digital signal, and transmit the digital signal to the information processing module, and the I/O acquisition module is an I/O port and is configured to receive an action signal acquired by the position sensor 403 and transmit the action signal to the information processing module. Illustratively, the information processing module adopts an FPGA processor chip, which is in a model of EP4CE6E22I7, and performs an AD signal filtering algorithm and per unit processing suitable for application characteristics of the on-load tap changer and communication coding processing of the I/O signal on the received information, where the AD signal filtering algorithm and per unit processing and the communication coding processing of the I/O signal are all in the prior art, and are not described herein, and are output in a digital coding manner after processing, for example, to a corresponding display screen for display, so as to facilitate monitoring by a manager. The power supply module comprises a voltage conversion circuit which is used for providing power supply required by work for the A/D conversion module, the I/O acquisition module and the information processing module, for example, the working power supply of the A/D conversion module, the I/O acquisition module and the information processing module is 5V, 3.3V and 1.2V, and the voltage conversion circuit converts the voltage of commercial power or a battery into working voltage of 5V, 3.3V and 1.2V respectively.
After the action information and the current information are output, related workers or intelligent judgment terminals can judge whether the switching knife switch is abnormal or not according to the time when the action information and the current information appear and give an alarm. Specifically, as shown in fig. 6, in the hybrid on-load tap changer of power electronics and mechanics, the switching knife switch includes a moving contact and a fixed contact, and the moving contact has a specially designed copper-tungsten arc point, and when the hybrid on-load tap changer of power electronics and mechanics works normally, because current flows through the power electronic component only after the fixed contact and the moving contact are completely separated, the start time of the motion information of the power electronic component has a certain interval with the start time of the current information, and the motion signal of the position sensor 403 is earlier than the start time of the current signal given by the current sensor 401. When the tapping switch is frequently switched and the copper-tungsten arc ignition point of the moving contact is burnt, the separation time of the moving contact and the fixed contact is shortened along with the ablation of the copper-tungsten arc ignition point, and the initial time of the current signal of the power electronic component is gradually advanced. Therefore, by setting the current out-of-limit protection threshold, when the lead is smaller than the current out-of-limit protection threshold, the situation that the copper-tungsten arc ignition point of the moving contact is burned and corroded is serious, and the moving contact needs to be overhauled. For example, when the time is advanced to within 10ms of the start time of the position sensor 403, a current abnormality alarm is issued. Meanwhile, as the copper-tungsten arc ignition point of the moving contact is ignited and corroded, the gap is enlarged at the closing moment, the current through-flow time of the power electronic assembly is increased, the current through-flow time is gradually delayed, and the current end time of the power electronic assembly and the action information end time interval of the position sensor 403 are also gradually reduced, so that the end time interval can be compared with a current out-of-limit protection threshold value to judge whether the copper-tungsten arc ignition point is ignited and corroded abnormally, for example, when the current end time of the power electronic assembly and the action information end time interval of the position sensor 403 are less than 10ms, an alarm is started.
The on-load tap-changer monitoring device provided by the embodiment of the invention is applied to an electric, electronic and mechanical hybrid on-load tap-changer and comprises a position sensor 403, a current sensor 401 and an information acquisition processor 402, wherein the position sensor 403 is arranged on a transmission component of the on-load tap-changer and is used for detecting action information of a switching knife switch of the on-load tap-changer, the current sensor 401 is arranged in a loop of a power electronic component of the on-load tap-changer and the switching switch and is used for detecting current information of the power electronic component, and the information acquisition processor 402 is respectively connected with the position sensor 403 and the current sensor 401 and is used for receiving the action information and the current information and outputting the action information and the current information. According to the on-load tap-changer monitoring device, the position sensor 403 is arranged on the transmission assembly, the current sensor 401 is arranged in the loop of the power electronic assembly and the change-over switch, so that the action information of the change-over switch in the power electronic mechanical hybrid on-load tap-changer and the current information of the power electronic assembly can be monitored in real time, the installation position is reasonable, and the monitoring of the internal information of the on-load tap-changer is facilitated.
In one embodiment, referring to fig. 3 and 4, the transmission assembly comprises a first transmission rod and a second transmission rod 4, the first transmission rod is arranged in the on-load tap-changer and connected with the switching knife switch, one end of the second transmission rod 4 is connected with the first transmission rod, the other end of the second transmission rod 4 penetrates through the housing 14 of the on-load tap-changer and is connected with the position sensor 403, and the second transmission rod 4 is connected with the housing 14 of the on-load tap-changer in a rotating and sealing mode. Specifically, the first transmission rod is integrally and rotatably arranged inside the on-load tap-changer, and comprises a metal transmission rod 2 and an insulating transmission rod 3 according to the internal structure requirement of the on-load tap-changer; one end of the metal transmission rod 2 is connected with the rotating shaft 1 and penetrates through the lower half portion of the on-load tap-changer, the upper portion of the on-load tap-changer is an oil chamber of the on-load tap-changer, when the metal transmission rod passes through the oil chamber, the insulating transmission rod 3 is adopted, one end of the insulating transmission rod 3 is connected with the metal transmission rod 2, the other end of the insulating transmission rod 3 is connected with the lower end of the second transmission rod 4, the upper end of the second transmission rod 4 extends out towards the outside of a shell of the on-load tap-changer and is provided with a position sensor 403, and the second transmission rod 4 is connected with a shell 14 of the on-load tap-changer in a rotating and sealing mode through a bearing. In the embodiment, the second transmission rod 4 is arranged to mount the position sensor 403, so that the position sensor 403 can detect the action information of the switching knife switch outside the on-load tap-changer, the mounting is convenient, and the work of the on-load tap-changer is not influenced.
In one embodiment, referring to fig. 4 and 5, the position sensor 403 includes a light source emitter 7, a light source receiver 8, and a blocking member 5, the blocking member 5 is connected to the second transmission rod 4 and rotates coaxially with the second transmission rod 4, the light source emitter 7 and the light source receiver 8 are respectively disposed on the upper side and the lower side of the blocking member 5, at least two light holes 12 are disposed on the blocking member 5, when the switch is closed, the light source emitter 7, the light holes 12, and the light source receiver 8 form a light source path, the light source emitter 7 is configured to emit a light signal, and the light source receiver 8 is configured to detect whether the light signal is received. Specifically, the blocking member 5 is disc-shaped, the central position of the blocking member is provided with a fixing hole 13, the blocking member is clamped with the second transmission rod 4 through the fixing hole 13, and when the second transmission rod 4 rotates, the blocking member 5 rotates along with the second transmission rod. The edges of the fixing holes 13 are provided with 4 light-transmitting holes 12, which are uniformly spaced at 90 degrees along the edge of the blocking member 5. Through setting up 4 light trap 12, when avoiding only one to pass the hole, be sheltered from and cause the action erroneous judgement because of some reason.
The light source emitter 7 and the light source receiver 8 are fixed by the mounting frame 6 on the top of the housing 14 and do not follow the rotation of the second transmission rod 4. When the switch is closed, the light source emitter 7, the light hole 12 and the light source receiver 8 are aligned along the light source path, and the light emitted from the light source emitter 7 can pass through the light hole 12, so that the light signal is received by the light source receiver 8, and when the light signal is received by the light source receiver 8, no action signal is sent to the information acquisition processor 402. When the switch is rotated, the first transmission rod and the second transmission rod 4 are driven to rotate at the same time, the blocking piece 5 is driven to rotate, at this time, the light hole 12 of the blocking piece 5 deviates from the light source path, at this time, the blocking piece 5 blocks the light emitted by the light source emitter 7, the light source receiver 8 cannot receive the light signal, and then an action signal is sent to the information acquisition processor 402. When the switch is switched, the next light hole 12 is just aligned with the light source path, and the light source receiver 8 receives the light signal again and stops sending the action signal.
In one embodiment, the on-load tap-changer monitoring device further comprises a control unit, one end of the control unit is connected with the light source receiver 8, and the other end of the control unit is connected with the information acquisition processor 402, and when the light source receiver 8 does not receive the light signal, the control unit sends action information to the information acquisition processor 402. The control unit adopts a single chip microcomputer, the information of the light source receiver 8 is processed through the single chip microcomputer, and when the light source receiver 8 does not receive the light signal, the control unit sends action information to the information acquisition processor 402. In other embodiments, the light source receiver 8 with an integrated control unit may be used, and the control unit may not be required to be additionally provided.
In one embodiment, as shown in fig. 6, the on-load tap-changer monitoring device further comprises a voltage sensor, two detection terminals of the voltage sensor are respectively connected with two terminals of the power electronic component, and an output terminal of the voltage sensor is connected with the information acquisition processor 402. Specifically, the voltage sensor is a high potential voltage sensor. The electrical signal quantity during the switching action of the tap changer can be measured directly. A high-voltage cable is led out from two ends of a power electronic component of an electronic part of the on-load tap-changer by using a transformer insulating sleeve to be connected with a voltage sensor, an information acquisition processor 402 acquires a voltage signal of the power electronic component through the voltage sensor, an overvoltage protection value of the power electronic component is set according to system requirements, whether a switching process is normal or not is judged according to the voltage signal of the power electronic component, and an overvoltage protection alarm or a transformer trip application is given.
In one embodiment, the on-load tap changer monitoring device further comprises a status monitor display, which is connected to the information collection processor 402 for displaying action information and current information. In addition, the monitoring display is also used for displaying the voltage signal detected by the voltage sensor. Specifically, the monitoring display draws an action curve, a current curve and a voltage curve according to a voltage signal, action information and current information to display, sets an overvoltage protection threshold and a current action out-of-limit protection threshold according to system requirements, gives an overvoltage alarm or a transformer tripping application when an overvoltage working condition exists in the power electronic assembly, and gives a tapping switch contact erosion alarm or a transformer tripping application when the power electronic assembly has an electric power out-of-limit (namely the current advance or the interval of the ending action time is smaller than the current action out-of-limit protection threshold).
Specifically, as shown in fig. 8, the topological structure diagram of the mechatronic hybrid on-load tap-changer monitored in this embodiment is that the switching disconnecting link may be equivalent to a first switch 100, a second switch 200, a third switch 300, and a fourth switch 400, and the power electronic component includes a first power electronic switch 701, a second power electronic switch 702, and a third power electronic switch 703. Specific action curves, current curves and voltage curves are shown in fig. 9 and 10. In the waveforms shown in fig. 9 and 10, a third power electronic switch 703 voltage curve, a third power electronic switch 703 current curve, a second power electronic switch 702 voltage curve, a second power electronic switch 702 current curve, a first power electronic switch 701 voltage curve, a first power electronic switch 701 current curve, a first switch 100 disconnecting link operating curve, and a second switch 200 disconnecting link operating curve are arranged from top to bottom in this order. Fig. 9 shows waveforms during normal operation, where the advance of the current profiles of the second switch 200 disconnecting link and the third power electronic switch 703 is 17ms.
When the switching knife switch is frequently switched and the copper-tungsten arc ignition point of the contact is burnt, the initial time of a current curve of the power electronic switch is gradually advanced, the advance is gradually reduced, when the advance is less than 10ms, an alarm is started, and when the advance is less than 2ms, a transformer is applied for tripping maintenance. For example, in fig. 10, the time interval between the falling edge of the disconnecting link action curve of the first switch 100 (the left side in fig. 10 is the falling edge, and the right side is the rising edge) and the starting time of the current curve of the first power electronic switch 701 is the corresponding lead, and the lead in fig. 10 is 9ms, which indicates that the copper-tungsten arc ignition point of the movable contact is burned seriously, and an alarm is started. Meanwhile, the copper-tungsten arc ignition point of the moving contact is burnt, the gap is enlarged at the closing moment, the current through-flow time of the power electronic component is prolonged, the current through-flow time is gradually delayed, the interval between the ending time of the action information and the ending time of the current information is shortened and shortened, and the interval between the ending action time is reduced along with the copper-tungsten arc ignition point. When the interval between the current-flowing end time of the power electronic component and the end time of the action curve of the position sensor 403 is less than 10ms, for example, the interval between the rising edge of the disconnecting link action curve of the second switch 200 and the end time of the current curve of the first power electronic switch 701 in fig. 10 is an off action time interval, and when the off action time interval is less than 10ms, an alarm is started; when the interval between the current through cut-off moment of the power electronic assembly and the cut-off action moment of the position sensor 403 is less than 5ms, the transformer is applied for tripping maintenance.
In addition, the voltage at two ends of the power electronic component in the switching process of the on-load tap-changer is monitored by using a high-potential voltage sensor. In the normal switching process of the on-load tap-changer, the withstand voltage waveform at two ends of the power electronic component is normal, for example, a +/-800 kV converter transformer, determines a corresponding withstand voltage peak value according to the interstage voltage, the running current value and the transition resistance value, the withstand voltage peak value in the switching process should not exceed 10kV, when an abnormality occurs in the switching process, such as a short circuit of a switching knife switch, the withstand voltage of the power electronic component exceeds 10kV, such as when the voltage of the voltage curve of the first power electronic switch 701, the voltage curve of the second power electronic switch 702 or the voltage curve of the third power electronic switch 703 in fig. 10 exceeds 10kV, a transformer trip overhaul is applied.
The working principle of the on-load tap-changer monitoring device provided by the embodiment of the invention is as follows:
1. the power-on and the startup are carried out, the information acquisition processor 402 is started and reset, the information of the Hall sensor and the high-potential voltage sensor is collected, the state monitoring display is started to work in a state to be triggered, and the state information is recorded by formal switching of the mechanical power electronic on-load tap-changer.
2. When the mechanical-electrical-electronic hybrid on-load tap changer starts to switch, the first transmission rod and the second transmission rod 4 are driven to rotate when the switch is switched to act, the blocking piece 5 is further rotated, the blocking piece 5 blocks an optical signal, the optical signal cannot be received by the light source receiver 8, the control unit sends a switching starting signal to the information acquisition processor 402, the information acquisition processor 402 sends the switching starting signal to the state monitoring display, the state monitoring display starts an automatic triggering function, and voltage information, action information and current information uploaded by the information acquisition processor 402 after the triggering moment begins to be recorded; when the action of switching the disconnecting link is completed, the rotating blocking piece 5 rotates in place, the light source receiver 8 obtains light again, the control unit sends a switching completion signal to the information acquisition processor 402, the information acquisition processor 402 sends the switching completion signal to the state monitoring display, and the switching of the display finishes the switching record.
3. The state monitoring display draws a voltage curve, an action curve and a current curve according to the switching action starting and ending time recorded in the switching process and according to the voltage information, the action information and the current information uploaded by the information acquisition processor 402.
4. And setting an overvoltage protection value and a current out-of-limit protection threshold value of the power electronic component according to system requirements, and judging whether the switching process is normal. And judging whether the switching process is normal or not according to the voltage curve of the power electronic component, and giving an overvoltage protection alarm or a transformer tripping application when the voltage is overhigh. And setting a current out-of-limit protection threshold according to system requirements, judging whether the switching process is normal or not according to a current curve of the power electronic component and action position information of the mechanical disconnecting link, and giving a contact burning alarm or a transformer tripping application when abnormality occurs.
5. Waiting for the next tap changer switching, and repeating the previous judging process.
An embodiment of the present invention further provides an on-load tap-changer monitoring method, which is applied to the on-load tap-changer monitoring apparatus according to the above embodiment of the present invention, and as shown in fig. 11, the method includes: step S100: acquiring action information of a switching knife switch of the on-load tap-changer and current information of the power electronic component; step S200: and judging whether the on-load tap-changer is abnormal or not according to the interval between the starting time of the action information and the starting time of the current information and/or whether the interval between the ending time of the action information and the ending time of the current information is larger than a preset current out-of-limit protection threshold or not.
Specifically, the action information of the switching knife switch and the current information of the power electronic component are obtained by monitoring through the position sensor 403 and the current sensor 401. In the hybrid on-load tap-changer of the power electronic machinery, a switching knife switch comprises a moving contact and a fixed contact, a specially designed copper-tungsten arc ignition point is arranged on the moving contact, when the hybrid on-load tap-changer of the power electronic machinery works normally, current can flow through a power electronic component only after the fixed contact and the moving contact are completely separated, so that a certain interval exists between the starting time of the action information of the power electronic component and the starting time of the current information, and the action signal of a position sensor 403 is ahead of the starting time of the current signal given by a current sensor 401. When the tapping switch is frequently switched and the copper-tungsten arc ignition point of the moving contact is burnt, the separation time of the moving contact and the fixed contact is shortened along with the ablation of the copper-tungsten arc ignition point, and the initial time of the current signal of the power electronic component is gradually advanced. Therefore, by setting the current out-of-limit protection threshold, when the lead is smaller than the current out-of-limit protection threshold, the situation that the copper-tungsten arc ignition point of the moving contact is burned and corroded is serious, and the moving contact needs to be overhauled. For example, when the time is advanced to within 10ms of the start time of the position sensor 403, a current abnormality alarm is issued. Meanwhile, as the copper-tungsten arc ignition point of the moving contact is ignited and corroded, the gap is enlarged at the closing moment, the current through-flow time of the power electronic assembly is increased, the current through-flow time is gradually delayed, and the current end time of the power electronic assembly and the action information end time interval of the position sensor 403 are also gradually reduced, so that the end time interval can be compared with a current out-of-limit protection threshold value to judge whether the copper-tungsten arc ignition point is ignited and corroded abnormally, for example, when the current end time of the power electronic assembly and the action information end time interval of the position sensor 403 are less than 10ms, an alarm is started.
The on-load tap-changer monitoring method provided by the embodiment of the invention utilizes the characteristic that the interval between the starting time of the action information and the starting time of the current information and the interval between the ending time of the action information and the ending time of the current information are reduced along with the increase of the burning degree of the copper-tungsten arc-leading point, judges whether the on-load tap-changer is abnormal or not by monitoring the action information of the switching knife switch and the current information of the power electronic component in the power electronic mechanical hybrid on-load tap-changer in real time and according to the interval between the starting time of the action information and the starting time of the current information and/or whether the interval between the ending time of the action information and the ending time of the current information is larger than the preset current out-of-limit protection threshold value or not, can monitor whether the on-load tap-changer is abnormal or not in real time without opening the on-load tap-changer, provides a new idea for monitoring the on-load tap-changer, and is convenient for monitoring the action information and the current information and does not influence on the work of the on-load-tap-load tap-switch.
In an embodiment, the determining whether the on-load tap-changer is abnormal according to whether an interval between a start time of the action information and a start time of the current information and/or an interval between an end time of the action information and an end time of the current information is smaller than a preset current out-of-limit protection threshold includes: respectively comparing whether the interval between the starting time of the action information and the starting time of the current information is smaller than a first out-of-limit protection threshold and a second out-of-limit protection threshold, when the interval between the starting time of the action information and the starting time of the current information is smaller than the first out-of-limit protection threshold, sending a first type of abnormal warning, and when the interval between the starting time of the action information and the starting time of the current information is smaller than the second out-of-limit protection threshold, sending a second type of abnormal warning, wherein the first out-of-limit protection threshold is larger than the second out-of-limit protection threshold. Illustratively, the first out-of-limit protection threshold and the second out-of-limit protection threshold are respectively set to be 10ms and 2ms, and when the interval between the starting time of the action information and the starting time of the current information is less than 10ms, a first-class abnormity warning is sent out, wherein the first-class abnormity warning is a contact erosion alarm; and when the interval between the starting time of the action information and the starting time of the current information is less than 2ms, sending a second type of abnormal warning, wherein the second type of abnormal warning is the application for tripping maintenance of the transformer.
And/or respectively comparing whether the interval between the end time of the action information and the end time of the current information is smaller than a third out-of-limit protection threshold and a fourth out-of-limit protection threshold, when the interval between the end time of the action information and the end time of the current information is smaller than the third out-of-limit protection threshold, sending a first type of abnormal warning, and when the interval between the end time of the action information and the end time of the current information is smaller than the fourth out-of-limit protection threshold, sending a second type of abnormal warning, wherein the third out-of-limit protection threshold is larger than the fourth out-of-limit protection threshold. Illustratively, the third out-of-limit protection threshold and the fourth out-of-limit protection threshold are respectively set to be 10ms and 5ms, and when the interval between the ending time of the action information and the ending time of the current information is less than 10ms, a first-class abnormity warning is sent out, wherein the first-class abnormity warning is a contact erosion alarm; and when the interval between the ending time of the action information and the ending time of the current information is less than 5ms, sending a second type of abnormal warning, wherein the second type of abnormal warning is the application for the tripping maintenance of the transformer.
In one embodiment, the on-load tap-changer monitoring method further comprises: and acquiring voltage information of the power electronic component, and judging whether the on-load tap-changer is abnormal according to whether the voltage information is greater than a preset overvoltage protection threshold value. And judging whether the voltage is greater than a preset overvoltage protection threshold value or not in the switching process according to the voltage information, and giving an overvoltage protection alarm or a transformer tripping application when the voltage is greater than the preset overvoltage protection threshold value.
An embodiment of the present invention further provides an electronic device, as shown in fig. 12, including: the memory 501 and the processor 502 are communicatively connected to each other, the memory 501 and the processor 502 are used for storing computer instructions, and the processor 502 executes the computer instructions to perform the steps of the on-load tap-changer monitoring method according to the above-mentioned embodiment of the present invention. Wherein the processor 502 and the memory 501 may be connected by a bus or other means. Processor 502 may be a Central Processing Unit (CPU). The processor 502 may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations thereof. The memory 501, which is a non-transitory computer storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the corresponding program instructions/modules in embodiments of the present invention. The processor 502 executes various functional applications and data processing of the processor 502 by executing non-transitory software programs, instructions and modules stored in the memory 501, namely, the steps in the on-load tap changer monitoring method in the above-described method embodiment. The memory 501 may include a storage program area and a storage data area, wherein the storage program area may store an application program required for operating the device, at least one function; the storage data area may store data created by the processor 502, and the like. Further, the memory 501 may include high speed random access memory 501, and may also include non-transitory memory 501, such as at least one piece of disk memory 501, flash memory device, or other non-transitory solid state memory 501. In some embodiments, the memory 501 may optionally include memory 501 located remotely from the processor 502, and these remote memories 501 may be connected to the processor 502 through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. One or more modules are stored in the memory 501 which, when executed by the processor 502, perform the steps of the on-load tap changer monitoring method as in the above-described method embodiments. The specific details of the electronic device may be understood according to the relevant description and effect corresponding to the method embodiment, and are not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, as shown in fig. 13, on which a computer program 601 is stored, where the instructions, when executed by a processor, implement the steps in the on-load tap-changer monitoring method in the foregoing embodiment. The storage medium is also stored with audio and video stream data, characteristic frame data, an interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), a flash memory (FlashMemory), a hard disk (hard disk drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program instructing relevant hardware, and the computer program 13 may be stored in a computer readable storage medium, and when executed, the program may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), a flash memory (FlashMemory), a hard disk (hard disk drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. The utility model provides an on-load tap-changer monitoring devices, is applied to power electronic machinery hybrid on-load tap-changer which characterized in that includes:
the position sensor is arranged on a transmission component of the on-load tap-changer and is used for detecting the action information of a switching knife switch of the on-load tap-changer;
the current sensor is arranged in a loop of a power electronic component of the on-load tap-changer and a change-over switch and is used for detecting current information of the power electronic component;
and the information acquisition processor is respectively connected with the position sensor and the current sensor and used for receiving the action information and the current information and outputting the action information and the current information.
2. The on-load tap-changer monitoring device of claim 1, wherein the transmission assembly comprises a first transmission rod and a second transmission rod, the first transmission rod is arranged in the on-load tap-changer and connected with the switching knife switch, one end of the second transmission rod is connected with the first transmission rod, the other end of the second transmission rod penetrates through the housing of the on-load tap-changer and is connected with the position sensor, and the second transmission rod is connected with the housing of the on-load tap-changer in a rotating and sealing manner.
3. The on-load tap changer monitoring device according to claim 2, wherein the position sensor comprises a light source transmitter, a light source receiver and a blocking member, the blocking member is connected to the second transmission rod and rotates coaxially with the second transmission rod, the light source transmitter and the light source receiver are respectively disposed on the upper side and the lower side of the blocking member, the blocking member is provided with at least two light-transmitting holes, when the switch is closed, the light source transmitter, the light-transmitting holes and the light source receiver form a light source path, the light source transmitter is used for transmitting a light signal, and the light source receiver is used for detecting whether the light signal is received.
4. The on-load tap changer monitoring device of claim 3, wherein a fixing hole is formed in the middle of the blocking member, and the blocking member is clamped with the second transmission rod through the fixing hole.
5. The on-load tap changer monitoring device of claim 3, further comprising a control unit, wherein one end of the control unit is connected to the light source receiver, and the other end is connected to the information collection processor, and when the light source receiver does not receive the light signal, the control unit sends action information to the information collection processor.
6. The on-load tap changer monitoring device according to claim 1, further comprising a voltage sensor, wherein two detection terminals of the voltage sensor are connected to two terminals of the power electronics module, respectively, and an output terminal of the voltage sensor is connected to the information acquisition processor.
7. The on-load tap changer monitoring device of claim 1, further comprising a status monitoring display connected to the information collection processor for displaying action information and current information.
8. An on-load tap changer monitoring method applied to the on-load tap changer monitoring device as claimed in any one of claims 1 to 7, comprising:
acquiring action information of a switching knife switch of the on-load tap-changer and current information of the power electronic component;
and judging whether the on-load tap-changer is abnormal or not according to the interval between the starting time of the action information and the starting time of the current information and/or whether the interval between the ending time of the action information and the ending time of the current information is smaller than a preset current out-of-limit protection threshold or not.
9. The on-load tap-changer monitoring method according to claim 8, wherein determining whether the on-load tap-changer is abnormal according to whether an interval between a start time of the action information and a start time of the current information and/or an interval between an end time of the action information and an end time of the current information is smaller than a preset current out-of-limit protection threshold comprises:
respectively comparing whether the interval between the starting time of the action information and the starting time of the current information is smaller than a first out-of-limit protection threshold and a second out-of-limit protection threshold, when the interval between the starting time of the action information and the starting time of the current information is smaller than the first out-of-limit protection threshold, sending a first type of abnormal warning, and when the interval between the starting time of the action information and the starting time of the current information is smaller than the second out-of-limit protection threshold, sending a second type of abnormal warning, wherein the first out-of-limit protection threshold is larger than the second out-of-limit protection threshold;
and/or respectively comparing whether the interval between the ending time of the action information and the ending time of the current information is smaller than a third out-of-limit protection threshold and a fourth out-of-limit protection threshold, when the interval between the ending time of the action information and the ending time of the current information is smaller than the third out-of-limit protection threshold, sending a first type of abnormal warning, and when the interval between the ending time of the action information and the ending time of the current information is smaller than the fourth out-of-limit protection threshold, sending a second type of abnormal warning, wherein the third out-of-limit protection threshold is larger than the fourth out-of-limit protection threshold.
10. The on-load tap changer monitoring method of claim 8, further comprising: the method comprises the steps of obtaining voltage information of the power electronic assembly, and judging whether an on-load tap-changer is abnormal or not according to whether the voltage information is larger than a preset overvoltage protection threshold or not.
11. An electronic device, comprising: -a memory communicatively connected to the processor, the memory storing computer instructions, and-a processor executing the computer instructions to perform the on-load tap-changer monitoring method according to any of the claims 8 to 10.
12. A computer-readable storage medium storing computer instructions for causing a computer to perform the on-load tap changer monitoring method of any one of claims 8 to 10.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116380805A (en) * | 2023-05-16 | 2023-07-04 | 上海交通大学 | On-load tap-changer gas monitoring method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116380805A (en) * | 2023-05-16 | 2023-07-04 | 上海交通大学 | On-load tap-changer gas monitoring method and system |
| CN116380805B (en) * | 2023-05-16 | 2023-12-05 | 上海交通大学 | On-load tap-changer gas monitoring method and system |
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