CN218524835U - On-load tap-changer monitoring device - Google Patents
On-load tap-changer monitoring device Download PDFInfo
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- CN218524835U CN218524835U CN202222446870.4U CN202222446870U CN218524835U CN 218524835 U CN218524835 U CN 218524835U CN 202222446870 U CN202222446870 U CN 202222446870U CN 218524835 U CN218524835 U CN 218524835U
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Abstract
The utility model discloses an on-load tap-changer monitoring devices, the device include position sensor, current sensor and information acquisition treater, and position sensor sets up on-load tap-changer's drive assembly for detect the action information of on-load tap-changer's change-over switch, current sensor set up in on-load tap-changer's power electronic component and change-over switch's return circuit, be used for detecting power electronic component's current information, information acquisition treater are used for receiving action information and current information, and will move information and current information output. The utility model discloses on-load tap-changer monitoring devices sets up current sensor through installing position sensor on transmission assembly in power electronic component and change over switch's return circuit, can monitor the action information of switching over the switch and power electronic component's current information in real time, and the mounted position is reasonable, is convenient for monitor on-load tap-changer internal information.
Description
Technical Field
The utility model relates to a transformer technical field especially relates to an on-load tap-changer monitoring devices.
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 electric electronic on-load tap-changer is in a theoretical research stage. Mechanical and power electronic hybrid on-load tap-changer is adopted, and a semi-control power electronic component replaces a mechanical change-over switch, so that 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 of the tapping switch is pushed after energy is stored by a spring, the spring energy storage is driven by a motor, and the accurate moment of the knife switch 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 working 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 changing switch 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 needs to be solved urgently.
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 shaft of the tap switch driving motor. 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.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides an on-load tap changer monitoring device to solve the unreasonable technical problem of current monitoring device installation.
The utility model provides a technical scheme as follows:
the embodiment of the utility model provides an on-load tap-changer monitoring devices is applied to the mixed on-load tap-changer of power electronic machinery, include: 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.
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 comprises a control unit, one end of the control unit is connected to the light source receiver, and 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 action information to the information acquisition processor.
Optionally, the on-load tap-changer monitoring device further comprises 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.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:
the embodiment of the utility model provides an on-load tap-changer monitoring devices, the device include position sensor, current sensor and information acquisition treater, and position sensor sets up on-load tap-changer's drive assembly for detect the action information of on-load tap-changer's switching knife switch, current sensor set up in on-load tap-changer's power electronic component and change over switch's return circuit, be used for detecting power electronic component's current information, information acquisition treater respectively with position sensor with current sensor connects for receive action information and current information, and with action information and current information output. The utility model discloses on-load tap-changer monitoring devices sets up current sensor through mounted position sensor on transmission assembly in power electronic component and change over switch's the return circuit, can monitor the action information of power electronic machinery hybrid on-load tap-changer inner transfer switch and power electronic component's current information in real time, and mounted position is reasonable, is convenient for monitor on-load tap-changer internal information.
Drawings
In order to clearly express the technical solution of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of an on-load tap changer monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an electric, 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 an electric, electronic and 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 in 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 structure of a monitoring device for an on-load tap changer according to another embodiment of the present invention;
fig. 8 is a schematic view of a topology of an electrical, electronic and mechanical hybrid on-load tap changer according to another embodiment of the present invention;
fig. 9 is a schematic diagram of the display of the monitoring data under normal conditions in the embodiment of the present invention;
fig. 10 is a schematic diagram showing monitoring data in the case of burning erosion according to another embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides an on-load tap-changer monitoring devices is applied to the on-load tap-changer of power electronic machinery hybrid, as shown in figure 1, on-load tap-changer monitoring devices includes:
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 utility model discloses on-load tap-changer monitoring devices of embodiment is used for monitoring power electronic machinery 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 a power electronic component and a 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 operating current during tap changer switching is monitored by means of a hall current sensor 401.
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, and the model is EP4CE6E22I7, and performs an AD signal filtering algorithm and per-unit processing suitable for the 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 the prior art, and are not described herein too much, and the processed information is output in a digital coding manner, for example, to a corresponding display screen for display, so that monitoring by a manager is facilitated. The power module comprises a voltage conversion circuit which is used for providing power required by work for the A/D conversion module, the I/O acquisition module and the information processing module, for example, the working power 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 and give an alarm according to the time when the action information and the current information appear. 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 embodiment of the utility model provides a pair of on-load tap-changer monitoring devices, be applied to the on-load tap-changer of power electronic machinery hybrid, including position sensor 403, current sensor 401 and information acquisition processor 402, position sensor 403 sets up on-load tap-changer's transmission assembly, be used for detecting the action information of on-load tap-changer's switching knife-switch, current sensor 401 sets up in on-load tap-changer's power electronic component and change over switch's return circuit, be used for detecting power electronic component's current information, information acquisition processor 402 is connected with position sensor 403 and current sensor 401 respectively, be used for receiving action information and current information, and with action information and current information output. The utility model discloses on-load tap-changer monitoring devices sets up current sensor 401 through installing position sensor 403 on transmission assembly in power electronic component and change over switch's return circuit, can monitor the action information of switching over the switch in the power electronic machinery hybrid on-load tap-changer and power electronic component's current information in real time, and the mounted position is reasonable, is convenient for monitor on-load tap-changer internal information.
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 the shell of the on-load tap-changer, the position sensor 403 is arranged, and the second transmission rod 4 is connected with the 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 edge of the fixing hole 13 is provided with 4 light transmission holes 12 which are uniformly arranged along the edge of the blocking member 5 at intervals of 90 degrees. Through setting up 4 light trap 12, avoid only when passing 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 directly measured. 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 for 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 trip application when an overvoltage working condition exists in the power electronic assembly, and gives a tap changer contact erosion alarm or a transformer trip application when the power electronic assembly has an electric power out-of-limit (namely the current lead or the cut-off action time interval is smaller than the current action out-of-limit protection threshold).
Specifically, the topology structure diagram of the mechatronic hybrid on-load tap-changer monitored in this embodiment is shown in fig. 8, the switching knife-switch can 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 knife-switch action curve of the first switch 100 (the left side is the falling edge, and the right side is the rising edge in fig. 10) 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 and corroded 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 ending time of the power electronic component and the ending time of the action curve of the position sensor 403 is less than 10ms, for example, the interval between the rising edge of the knife switch action curve of the second switch 200 in fig. 10 and the ending time of the current curve of the first power electronic switch 701 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 voltage waveform endured by two ends of the power electronic component is normal, taking a converter transformer of +/-800 kV as an example, a corresponding withstand voltage peak value is determined according to the inter-stage voltage, the running current value and the resistance value of the transition resistor, the withstand voltage peak value in the switching process should not exceed 10kV, when the switching process is abnormal, 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, the transformer is applied for tripping maintenance.
The embodiment of the utility model provides an on-load tap-changer monitoring devices's theory of operation 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 acts, the blocking piece 5 is further rotated, the blocking piece 5 blocks optical signals, 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 time starts to be recorded; when the action of switching the knife switch 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 or not. 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 trip application when the voltage is too high. 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.
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 should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
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 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.
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 and lower sides of the blocking member, the blocking member is provided with at least two light holes, when the switch is closed, the light source transmitter, the light holes and the light source receiver form a light source path, the light source transmitter is configured to transmit a light signal, and the light source receiver is configured to detect 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 of claim 1, further comprising a voltage sensor having two sensing terminals connected to two terminals of the power electronics module, respectively, and an output terminal connected to the information collection 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222446870.4U CN218524835U (en) | 2022-09-14 | 2022-09-14 | On-load tap-changer monitoring device |
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| CN202222446870.4U CN218524835U (en) | 2022-09-14 | 2022-09-14 | On-load tap-changer monitoring device |
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| CN218524835U true CN218524835U (en) | 2023-02-24 |
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| CN202222446870.4U Active CN218524835U (en) | 2022-09-14 | 2022-09-14 | On-load tap-changer monitoring device |
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| Country | Link |
|---|---|
| CN (1) | CN218524835U (en) |
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2022
- 2022-09-14 CN CN202222446870.4U patent/CN218524835U/en active Active
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