CN113884870A - Transformer vacuum on-load tap-changer monitoring system and method - Google Patents
Transformer vacuum on-load tap-changer monitoring system and method Download PDFInfo
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- CN113884870A CN113884870A CN202111129237.6A CN202111129237A CN113884870A CN 113884870 A CN113884870 A CN 113884870A CN 202111129237 A CN202111129237 A CN 202111129237A CN 113884870 A CN113884870 A CN 113884870A
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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
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Abstract
The invention discloses a system and a method for monitoring a vacuum on-load tap-changer of a transformer. The system comprises an acquisition module, a diagnosis module and a monitoring module; the acquisition module is used for acquiring temperature information of the vacuum on-load tap-changer of the transformer to be detected; the temperature information comprises a temperature signal of a transfer switch contact plate of the transformer vacuum on-load tap-changer to be detected and an insulating oil temperature signal; the diagnosis module is used for acquiring a temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judging according to the temperature difference signal and outputting a control signal; the monitoring module is connected with the diagnosis module; the monitoring module is used for monitoring according to the control signal. The technical scheme provided by the invention realizes the diagnosis and early warning of the vacuum bubble fault electrical defect of the vacuum on-load tap-changer of the transformer and improves the operation safety of a power grid.
Description
Technical Field
The embodiment of the invention relates to an electronic detection technology, in particular to a system and a method for monitoring a vacuum on-load tap-changer of a transformer.
Background
With the development of high-voltage high-capacity direct-current transmission and high-capacity power transformers, the vacuum on-load tap-changer of the transformer is more and more widely applied to the transformer due to the advantages of high vacuum bubble insulation recovery speed and high on-off capacity. The vacuum on-load tap-changer switching circuit of the transformer generally comprises a vacuum bubble and a corresponding change-over switch, when the switch is switched, the arc extinction occurs in the vacuum bubble, and the change-over switch is generally operated when the switch is not electrified and plays a role in changing a circuit structure, so that the vacuum tap-changer can avoid the pollution of electric arcs to transformer oil, and the switching performance and the service life are improved.
However, the existing tap changer online monitoring is mainly based on vibration, voiceprint and motor torque measurement to evaluate and diagnose the mechanical state of the tap changer, but some electrical defects exist, which cannot be evaluated and judged, and bring safety risk to the operation of a power grid.
Disclosure of Invention
The invention provides a transformer vacuum on-load tap-changer monitoring system and a method, which can diagnose the electrical defect of a vacuum bubble fault of a transformer vacuum on-load tap-changer and perform early warning, and improve the operation safety of a power grid.
In a first aspect, an embodiment of the present invention provides a transformer vacuum on-load tap-changer monitoring system, which includes an acquisition module, a diagnostic module, and a monitoring module;
the acquisition module is used for acquiring temperature information of the vacuum on-load tap-changer of the transformer to be detected; the temperature information comprises a temperature signal of a transfer switch contact plate of the transformer vacuum on-load tap-changer to be detected and an insulating oil temperature signal;
the diagnosis module is connected with the acquisition module; the diagnosis module is used for acquiring a temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judging according to the temperature difference signal and outputting a control signal;
the monitoring module is connected with the diagnosis module; the monitoring module is used for monitoring according to the control signal.
Optionally, the acquisition module includes at least two temperature sensing units and an oil temperature sensing unit;
each temperature sensing unit is arranged on the corresponding change-over switch contact plate; the temperature sensing unit is used for collecting temperature signals of the contact plates of the change-over switch;
the oil temperature sensing unit is arranged at the top layer oil position in an oil chamber of the transformer vacuum on-load tap-changer; the oil temperature sensing unit is used for acquiring temperature signals of the insulating oil top layer in the oil chamber.
Optionally, the diagnostic module comprises a temperature difference unit and a comparison unit;
the temperature difference unit is connected with the comparison unit; the temperature difference unit is used for calculating a temperature difference signal between the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil;
the comparison unit is connected to the threshold signal, and is used for comparing the temperature difference signal with the threshold signal, and outputting a first level signal if the temperature difference signal is greater than the threshold signal; and outputting a second level signal when the temperature difference signal is less than or equal to the threshold signal, wherein the polarity of the first level signal is opposite to that of the second level signal.
Optionally, the diagnostic module further includes a diagnostic unit, and the diagnostic unit is respectively connected to the comparing unit and the temperature difference unit; the diagnosis unit is used for judging whether the temperature difference signal is in a first threshold range or a second threshold range, and outputting a first alarm signal if the temperature difference signal is in the first threshold range and the duration of the temperature difference signal is greater than a first time threshold; and if the temperature difference signal is in a second threshold range and the duration of the temperature difference signal is less than a second time threshold, outputting a second alarm signal.
Optionally, the monitoring module includes at least two alarm units; each alarm unit is correspondingly connected with the comparison unit; the alarm unit is used for alarming according to the first level signal and displaying alarm information.
Optionally, the temperature sensing unit and the oil temperature sensing unit adopt optical fiber temperature sensors.
In a second aspect, an embodiment of the present invention provides a method for monitoring a vacuum on-load tap-changer of a transformer, where the method is performed by the system for monitoring a vacuum on-load tap-changer of a transformer according to any one of the embodiments of the present invention, and the method includes:
the acquisition module acquires temperature information of a vacuum on-load tap-changer of the transformer to be detected; the temperature information comprises a temperature signal of a transfer switch contact plate of the transformer vacuum on-load tap-changer to be detected and an insulating oil temperature signal;
the diagnosis module acquires a temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judges according to the temperature difference signal and outputs a control signal;
and the monitoring module monitors according to the control signal.
Optionally, the acquisition module includes at least two temperature sensing units and an oil temperature sensing unit; each temperature sensing unit is arranged on the corresponding change-over switch contact plate; the oil temperature sensing unit is arranged at the top layer oil position in an oil chamber of the transformer vacuum on-load tap-changer.
The collection module collects temperature information of the vacuum on-load tap-changer of the transformer to be detected, and the collection module comprises: the temperature sensing unit collects temperature signals of the contact plates of the change-over switches;
the oil temperature sensing unit collects temperature signals of the insulating oil top layer in the oil chamber.
Optionally, the diagnostic module comprises a temperature difference unit and a comparison unit;
the diagnosis module obtains a temperature difference signal between the temperature of the transfer switch contact plate and the temperature of the insulating oil according to the temperature signal of the transfer switch contact plate and the temperature signal of the insulating oil, judges according to the temperature difference signal and outputs a control signal, and comprises the following steps:
the temperature difference unit calculates a temperature difference signal between the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil;
the comparison unit compares the temperature difference signal with the threshold signal, and outputs a first level signal if the temperature difference signal is greater than the threshold signal; and outputting a second level signal when the temperature difference signal is less than or equal to the threshold signal, wherein the polarity of the first level signal is opposite to that of the second level signal.
Optionally, the diagnostic module further comprises a diagnostic unit;
the diagnosis module obtains the temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judges according to the temperature difference signal and outputs a control signal, and the diagnosis module further comprises:
the diagnosis unit judges whether the temperature difference signal is in a first threshold range or a second threshold range, and if the temperature difference signal is in the first threshold range and the duration of the temperature difference signal is greater than a first time threshold, a first alarm signal is output; and if the temperature difference signal is in a second threshold range and the duration of the temperature difference signal is less than a second time threshold, outputting a second alarm signal.
According to the technical scheme provided by the embodiment of the invention, on the premise of not changing the original structure of the tap changer and not influencing the normal operation of the tap changer, the temperature signal of the contact plate of the change-over switch and the temperature signal of the insulating oil of the vacuum on-load tap changer of the transformer are acquired through the acquisition module, the temperature difference signal of the temperature signal of the contact plate of the change-over switch and the temperature signal of the insulating oil is acquired through the diagnosis module, and the diagnosis of the vacuum bubble fault electrical defect of the vacuum on-load tap changer of the transformer is realized through the judgment of the temperature difference data. The transformer vacuum on-load tap-changer can be prevented from electrical faults in the initial defect stage, the risk of the transformer vacuum on-load tap-changer faults is reduced, serious accident consequences such as turn-to-turn short circuit of the transformer caused by the defects of the transformer vacuum on-load tap-changer are avoided, and the safety and reliability of power grid operation are improved.
Drawings
Fig. 1 is a schematic structural diagram of a transformer vacuum on-load tap-changer monitoring system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another transformer vacuum on-load tap-changer monitoring system according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of another transformer vacuum on-load tap-changer monitoring system according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart of a method for monitoring a vacuum on-load tap-changer of a transformer according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
At present, a vacuum on-load tap-changer of a transformer is widely applied to a large transformer, but the vacuum bubble failure or the mechanical failure can still occur due to the dispersion of the quality of the vacuum bubble and the high requirement of the on-load tap-changer on the mechanical reliability. When the fault occurs, the change-over switch is electrified to discharge arc, the arc not only causes the temperature of the metal material of the change-over switch to be sharply increased, but also causes the insulating oil to be cracked, the oil is polluted to reduce the insulating property, and finally, serious electrical fault of the transformer can be caused.
In view of the above, an embodiment of the present invention provides a transformer vacuum on-load tap-changer monitoring system, and fig. 1 is a schematic structural diagram of the transformer vacuum on-load tap-changer monitoring system according to the embodiment of the present invention, referring to fig. 1, the system includes an acquisition module 110, a diagnostic module 120, and a monitoring module 130.
The acquisition module 110 is used for acquiring temperature information of the vacuum on-load tap-changer of the transformer to be detected; the temperature information comprises a temperature signal of a contact plate of a change-over switch of the transformer vacuum on-load tap-changer to be detected and a temperature signal of insulating oil.
The diagnostic module 120 is connected to the acquisition module 110. The diagnosis module 120 is configured to obtain a temperature difference signal between the temperature of the transfer switch contact plate and the temperature of the insulating oil according to the temperature signal of the transfer switch contact plate and the temperature signal of the insulating oil, and perform a judgment according to the temperature difference signal and output a control signal.
The monitoring module 130 is coupled to the diagnostic module 120. The monitoring module 130 is configured to perform monitoring according to the control signal.
Specifically, the collecting module 110 may collect internal position temperature information of the vacuum on-load tap-changer of the transformer, so as to represent the internal temperature of the vacuum on-load tap-changer of the transformer. The internal positions can include positions of a transfer switch and insulating oil, and the temperature of different positions forms different temperature signals. For example, the temperature of the diverter switch contact plate collected by the collection module 110 is used to form a temperature signal of the switch contact plate, and the temperature of the insulating oil is used to form an insulating oil temperature signal. When arc cutting failure occurs to a vacuum bubble of the transformer vacuum on-load tap-changer due to quality defects, the change-over switch is electrified to operate, electric arcs are generated between a moving contact and a fixed contact of the change-over switch, the temperature of a contact plate of the change-over switch is rapidly increased by the combustion of the electric arcs, and the temperature is obviously higher than the temperature of the top layer oil in an oil chamber of the tap-changer, so that whether the vacuum bubble has faults or not can be reflected according to the temperature of the contact plate of the change-over switch. The insulating oil heat conduction speed is lower compared with a contact plate of the transfer switch, so that the internal reference temperature of the vacuum on-load tap-changer of the transformer is reflected by detecting the temperature of the insulating oil. The diagnosis module 120 obtains a temperature difference signal between the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, and reflects the fault problem of the vacuum on-load tap-changer of the transformer by using the temperature difference signal. For example, when the temperature difference is in the normal range, it can be judged that the vacuum bubble is not failed and the contact resistance is normal. When the temperature difference exceeds a large range, the vacuum bubble of the vacuum on-load tap-changer of the transformer can be judged to have a fault, so that the vacuum bubble of the vacuum on-load tap-changer of the transformer can be diagnosed, and a control signal is output. The vacuum bubble is a high-temperature-resistant and high-pressure-resistant vacuum arc-extinguishing chamber, and the vacuum bubble has excellent insulating property due to high vacuum inside, so that the effect of arc-extinguishing on-off current is achieved during switch switching. The monitoring module 130 monitors according to the control signal, displays normal or fault information according to the monitoring result, and provides an alarm to remind operation and maintenance personnel to analyze, check and process the transformer vacuum on-load tap-changer.
According to the technical scheme provided by the embodiment of the invention, on the premise of not changing the original structure of the tap changer and not influencing the normal operation of the tap changer, the temperature signal of the contact plate of the change-over switch and the temperature signal of the insulating oil of the vacuum on-load tap changer of the transformer are acquired through the acquisition module, the temperature difference signal of the temperature signal of the contact plate of the change-over switch and the temperature signal of the insulating oil is acquired through the diagnosis module, and the diagnosis of the electrical defect of the vacuum bubble fault of the vacuum on-load tap changer of the transformer is realized through the judgment of the temperature difference data. The transformer vacuum on-load tap-changer can be prevented from electrical faults in the initial defect stage, the risk of the transformer vacuum on-load tap-changer faults is reduced, serious accident consequences such as turn-to-turn short circuit of the transformer caused by the defects of the transformer vacuum on-load tap-changer are avoided, and the operation safety of a power grid is improved.
Fig. 2 is a schematic structural diagram of another transformer vacuum on-load tap changer monitoring system according to an embodiment of the present invention, and referring to fig. 2, the collection module includes at least two temperature sensing units and an oil temperature sensing unit.
Each temperature sensing unit is disposed on a corresponding diverter switch contact plate. The temperature sensing unit is used for collecting temperature signals of the contact plates of the change-over switch.
The oil temperature sensing unit is arranged at the top layer oil position in an oil chamber of the transformer vacuum on-load tap-changer. The oil temperature sensing unit is used for acquiring temperature signals of an insulating oil top layer in the oil chamber.
Specifically, the number of the temperature sensing units is set according to the number of the transfer switches corresponding to the actual vacuum bubbles of the vacuum on-load tap-changer of the transformer, and for example, the vacuum bubbles of the vacuum on-load tap-changer of the transformer correspond to two groups of transfer switches according to the embodiment of the present invention, the first temperature sensing unit 220 is disposed on the contact plate K1 of the first transfer switch, and the second temperature sensing unit 230 is disposed on the contact plate K2 of the second transfer switch. The oil temperature sensing unit 210 is disposed at the top layer of the insulating oil inside the oil chamber or at a position far from the change-over switch. The temperature signal of the insulating oil is used as a threshold temperature signal or a reference temperature signal and is used for reflecting the standard normal temperature inside the vacuum on-load tap-changer of the transformer. Optionally, the temperature sensing unit and the oil temperature sensing unit employ optical fiber temperature sensors. The optical fiber temperature sensor can adopt an optical fiber grating temperature sensor, the optical fiber sensor has the advantages of high-voltage resistance, insulation and the like, the optical fiber temperature sensor is respectively arranged on the change-over switch contact plate and the insulating oil top layer, and the optical fiber fusion box 240 at the top of the oil tank of the vacuum on-load tap-changer of the transformer is used for outputting detection signals.
Based on the above embodiment, with continued reference to FIG. 2, the diagnostic module includes a temperature differential unit 250 and a comparison unit.
The temperature difference unit 250 is connected to the comparison unit. The temperature difference unit 250 is used for calculating a temperature difference signal between the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil.
The comparing unit is connected to the threshold signal 280, and the comparing unit is configured to compare the temperature difference signal with the threshold signal 280, and output a first level signal if the temperature difference signal is greater than the threshold signal 280. The temperature difference signal is less than or equal to the threshold signal 280, and a second level signal is output, wherein the first level signal and the second level signal have opposite polarities.
Specifically, the temperature difference unit 250 may set a calculation algorithm to subtract the insulating oil temperature from the transfer switch contact plate temperature to obtain a temperature difference value and generate a temperature signal. The set number of the comparison units is set according to the number of the transfer switches corresponding to the actual vacuum bubbles of the vacuum on-load tap-changer of the transformer.
Illustratively, in the embodiment of the present invention, the vacuum bubble of the vacuum on-load tap changer of the transformer corresponds to two groups of transfer switches, and the temperature difference unit 250 subtracts the temperature of the insulating oil from the temperature of the contact board of the first transfer switch to obtain a first temperature difference. And the temperature difference unit subtracts the temperature of the insulating oil from the temperature of the second change-over switch contact plate to obtain a second temperature difference. Two comparison units are provided, wherein the comparison units may use comparators, the positive pole of the first comparator 260 is connected to the first temperature difference signal, and the negative pole of the first comparator 260 is connected to the threshold signal. The positive pole of the second comparator 270 is connected to the second temperature difference signal, and the negative pole of the second comparator 270 is connected to the threshold signal 280. The threshold signal reflects the safe temperature difference inside the vacuum on-load tap-changer of the transformer. And when the positive pole signal of the comparator is greater than the negative pole of the comparator, outputting high level, otherwise, outputting low level. Therefore, when the temperature difference signal is greater than the threshold signal, the first level signal, i.e., the high level, is output. And if the temperature difference signal is less than or equal to the threshold signal, outputting a second level signal, namely low level. According to the operation experience, when the vacuum on-load tap-changer of the transformer is in a normal state, the change-over switch of the vacuum on-load tap-changer of the transformer is operated under an uncharged working condition, and the temperature of a contact plate of the change-over switch is basically consistent with that of insulating oil. When the vacuum bubble insulation of the vacuum tap switch is reduced to cause the vacuum bubble arc extinguishing failure, the change-over switch corresponding to the loop is electrified to operate, the arcing phenomenon in insulating oil occurs between the moving contact and the static contact of the change-over switch, and the temperature of the metal contact plate of the change-over switch is sharply increased by the arc ignition, and reaches hundreds of degrees centigrade. Therefore, whether the vacuum bubble of the vacuum on-load tap-changer of the transformer fails or not can be judged through the temperature difference signal, and when the temperature difference signal is smaller than or equal to the threshold signal, the insulation failure of the change-over switch is judged. And when the temperature difference signal is greater than the threshold signal, judging that the switching process of the change-over switch is abnormal. The detection structure is simplified, and the detection applicability is better.
Optionally, the monitoring module comprises at least two alarm units. Each alarm unit is correspondingly connected with the comparison unit. The alarm unit is used for alarming according to the first level signal and displaying alarm information.
Specifically, the number of the alarm units is set according to the number of the transfer switches corresponding to the actual vacuum bubbles of the vacuum on-load tap-changer of the transformer, that is, the transfer switches corresponding to each group of vacuum bubbles are matched with one alarm unit, the first alarm unit 320 is connected to the output signal of the first comparator 260, and the second alarm unit 330 is connected to the output signal of the second comparator 270. And the comparator starts alarming when outputting a first level signal, namely a high level, sends out a fault early warning to prompt that the corresponding change-over switch is in a loop with electrical defects, and gives a follow-up power failure maintenance suggestion.
Fig. 3 is a schematic structural diagram of another transformer vacuum on-load tap-changer monitoring system according to an embodiment of the present invention, and referring to fig. 3, the diagnostic module further includes a diagnostic unit 310.
The diagnosis unit 310 is connected to the comparison unit and the temperature difference unit 250, respectively. The diagnosis unit 310 is configured to determine whether the temperature difference signal is within a first threshold range or a second threshold range, and output a first alarm signal if the temperature difference signal is within the first threshold range and the duration of the temperature difference signal is greater than a first time threshold. And if the temperature difference signal is in the second threshold range and the duration of the temperature difference signal is less than the second time threshold, outputting a second alarm signal.
Specifically, in the process of switching the vacuum on-load tap changer of the transformer, the temperature difference between the temperature of the contact plate of the change-over switch and the temperature of the insulating oil can reflect corresponding electrical faults in different temperature ranges. Therefore, the diagnosis unit obtains and judges whether the temperature difference signal of the corresponding transfer switch is in the first threshold range or the second threshold range according to the level signal output by the comparison unit of the contact board of the corresponding transfer switch, for example, taking the first transfer switch contact board K1 as an example, when the first comparator 260 outputs a high level, the diagnosis unit 310 obtains the temperature difference between the temperature signal of the first transfer switch contact board K1 and the temperature signal of the insulating oil. The diagnostic unit 310 determines whether the temperature difference is within a first threshold range, which is set, for example, between 5 ℃ and 50 ℃. If the temperature difference between the temperature of the first transfer switch contact plate K1 and the temperature of the insulating oil is in the first threshold range and the temperature difference between the two remains stable for a longer duration, the duration exceeding the first time threshold. The situation that the vacuum on-load tap-changer of the transformer does not operate for a long time exists, the poor contact of the contact plates of the transfer switch is indicated, and the diagnosis unit 310 outputs a first alarm signal at the moment. When the first comparator 260 outputs a high level, the diagnosis unit 310 obtains a temperature difference between the temperature signal of the first transfer switch contact plate K1 and the temperature signal of the insulating oil, and the diagnosis unit 310 determines whether the temperature difference is within a second threshold range, which is set to 50 ℃ or higher, for example. If the temperature difference between the temperature of the first transfer switch contact plate K1 and the temperature of the insulating oil exceeds the second threshold range and the duration of the temperature difference is short, the instantaneous temperature of the first transfer switch contact plate rises rapidly during the switching action, indicating that the vacuum bubble insulation fails, and the diagnosis unit 310 outputs a second alarm signal. The second transfer switch contact board K2 is tested and determined in the same manner, which is not described herein. The fault states of poor contact of the switch contact plate and insulation failure of the vacuum bubble are different, and the type of the electrical fault of the vacuum bubble of the vacuum on-load tap-changer of the transformer or the contact plate of the change-over switch can be further judged by judging whether the temperature difference signal enters the first threshold range or the second threshold range and the duration time of the temperature difference signal.
Based on the above embodiment, referring to fig. 3, optionally, the monitoring module includes at least two alarm units. Each alarm unit is correspondingly connected with the comparison unit. The alarm unit is used for alarming by the first alarm signal or the second alarm signal and displaying alarm information.
Specifically, the number of the alarm units is set according to the number of the transfer switches corresponding to the actual vacuum bubbles of the vacuum on-load tap-changer of the transformer, that is, the transfer switches corresponding to each group of vacuum bubbles are matched with one alarm unit, and the first alarm unit 320 and the second alarm unit 330 are respectively connected to the output signals of the diagnosis unit 310. The alarm unit alarms the corresponding change-over switch according to the first alarm signal and prompts the fault of poor contact of the contact plate of the change-over switch or the alarm unit alarms the corresponding change-over switch according to the second alarm signal and prompts the fault information of insulation failure of the vacuum bulb.
Fig. 4 is a schematic flow diagram of a method for monitoring a vacuum on-load tap-changer of a transformer according to an embodiment of the present invention, and referring to fig. 4, the method for monitoring a vacuum on-load tap-changer of a transformer according to an embodiment of the present invention is implemented by a system for monitoring a vacuum on-load tap-changer of a transformer according to any embodiment of the present invention, and the method includes:
s110, the acquisition module acquires temperature information of the vacuum on-load tap-changer of the transformer to be detected. The temperature information comprises a temperature signal of a contact plate of a change-over switch of the transformer vacuum on-load tap-changer to be detected and an insulating oil temperature signal.
The collecting module 110 may collect internal position temperature information of the vacuum on-load tap-changer of the transformer, so as to represent the internal temperature of the vacuum on-load tap-changer of the transformer. The internal positions can include positions of a transfer switch and insulating oil, and the temperature of different positions forms different temperature signals. For example, the temperature of the diverter switch contact plate collected by the collection module 110 is used to form a temperature signal of the switch contact plate, and the temperature of the insulating oil is used to form an insulating oil temperature signal. When arc cutting failure occurs to a vacuum bubble of the transformer vacuum on-load tap-changer due to quality defects, the change-over switch is electrified to operate, electric arcs are generated between a moving contact and a fixed contact of the change-over switch, the temperature of a contact plate of the change-over switch is rapidly increased by the combustion of the electric arcs, and the temperature is obviously higher than the temperature of the top layer oil in an oil chamber of the tap-changer, so that whether the vacuum bubble has faults or not can be reflected according to the temperature of the contact plate of the change-over switch. The insulating oil heat conduction speed is lower compared with a contact plate of the transfer switch, so that the internal reference temperature of the vacuum on-load tap-changer of the transformer is reflected by detecting the temperature of the insulating oil.
And S120, the diagnosis module acquires a temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judges according to the temperature difference signal and outputs a control signal.
Specifically, the diagnosis module 120 obtains a temperature difference signal between the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, and reflects the fault problem of the vacuum on-load tap-changer of the transformer by using the temperature difference signal. For example, when the temperature difference is in the normal range, it can be judged that the vacuum bubble is not failed and the contact resistance is normal. When the temperature difference exceeds a large range, the temperature change of the vacuum bulb and the vacuum switch caused by the failure of the vacuum bulb can be judged to be large, so that the vacuum bulb of the vacuum on-load tap-changer of the transformer is diagnosed, and a control signal is output. The vacuum bubble is high-temperature-resistant and high-pressure-resistant, and has excellent insulating property due to high vacuum inside, so that the effect of arc extinguishing on-off current is achieved during switch switching.
And S130, monitoring by the monitoring module according to the control signal.
Specifically, the monitoring module 130 monitors according to the control signal, displays normal or fault information according to the monitoring result, and provides an alarm to remind an engineer to check the vacuum on-load tap-changer of the transformer.
Optionally, the acquisition module includes at least two temperature sensing units and an oil temperature sensing unit. Each temperature sensing unit is disposed on a corresponding diverter switch contact plate. The oil temperature sensing unit is arranged at the top layer oil position in an oil chamber of the transformer vacuum on-load tap-changer.
The collection module gathers the temperature information of waiting to detect transformer vacuum on-load tap-changer, includes: the temperature sensing unit collects temperature signals of the contact plates of the change-over switch.
The oil temperature sensing unit collects temperature signals of an insulating oil top layer in the oil chamber.
Optionally, the diagnostic module comprises a temperature difference unit and a comparison unit.
The diagnosis module obtains the temperature difference signal of change over switch contact plate temperature and insulating oil temperature according to change over switch contact plate temperature signal and insulating oil temperature signal to judge and output control signal according to the temperature difference signal, include:
the temperature difference unit calculates a temperature difference signal between the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil.
The comparison unit compares the temperature difference signal with a threshold signal, and outputs a first level signal if the temperature difference signal is greater than the threshold signal. And outputting a second level signal when the temperature difference signal is less than or equal to the threshold signal, wherein the first level signal and the second level signal have opposite polarities.
Optionally, the diagnostic module further comprises a diagnostic unit.
The diagnosis module obtains the temperature difference signal of change over switch contact plate temperature and insulating oil temperature according to change over switch contact plate temperature signal and insulating oil temperature signal to judge and output control signal according to the temperature difference signal, still include:
the diagnosis unit judges whether the temperature difference signal is in a first threshold range or a second threshold range, and if the temperature difference signal is in the first threshold range and the duration of the temperature difference signal is greater than a first time threshold, a first alarm signal is output. And if the temperature difference signal is in the second threshold range and the duration of the temperature difference signal is less than the second time threshold, outputting a second alarm signal.
The transformer vacuum on-load tap-changer monitoring method provided by the embodiment of the invention and the transformer vacuum on-load tap-changer monitoring system provided by any embodiment of the invention belong to the same inventive concept, have corresponding beneficial effects, and the detailed technical details in the embodiment are not referred to the transformer vacuum on-load tap-changer monitoring system provided by any embodiment of the invention.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and are not limited thereto. 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: modifications of the technical solutions described in the embodiments or equivalent replacements of some technical features may still be made. 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 (10)
1. A transformer vacuum on-load tap-changer monitoring system is characterized by comprising an acquisition module, a diagnosis module and a monitoring module;
the acquisition module is used for acquiring temperature information of the vacuum on-load tap-changer of the transformer to be detected; the temperature information comprises a temperature signal of a transfer switch contact plate of the transformer vacuum on-load tap-changer to be detected and an insulating oil temperature signal;
the diagnosis module is connected with the acquisition module; the diagnosis module is used for acquiring a temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judging according to the temperature difference signal and outputting a control signal;
the monitoring module is connected with the diagnosis module; the monitoring module is used for monitoring according to the control signal.
2. The transformer vacuum on-load tap changer monitoring system of claim 1, wherein the collection module comprises at least two temperature sensing units and an oil temperature sensing unit;
each temperature sensing unit is arranged on the corresponding change-over switch contact plate; the temperature sensing unit is used for collecting temperature signals of the contact plates of the change-over switch;
the oil temperature sensing unit is arranged at the top layer oil position in an oil chamber of the transformer vacuum on-load tap-changer; the oil temperature sensing unit is used for acquiring temperature signals of the insulating oil top layer in the oil chamber.
3. The transformer vacuum on-load tap changer monitoring system of claim 1, wherein the diagnostic module comprises a temperature differential unit and a comparison unit;
the temperature difference unit is connected with the comparison unit; the temperature difference unit is used for calculating a temperature difference signal between the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil;
the comparison unit is connected with a threshold signal, and is used for comparing the temperature difference signal with the threshold signal and outputting a first level signal if the temperature difference signal is greater than the threshold signal; and outputting a second level signal when the temperature difference signal is less than or equal to the threshold signal, wherein the polarity of the first level signal is opposite to that of the second level signal.
4. The transformer vacuum on-load tap changer monitoring system of claim 3, wherein the diagnostic module further comprises a diagnostic unit connected to the comparing unit and the temperature differential unit, respectively; the diagnosis unit is used for judging whether the temperature difference signal is in a first threshold range or a second threshold range, and outputting a first alarm signal if the temperature difference signal is in the first threshold range and the duration of the temperature difference signal is greater than a first time threshold; and if the temperature difference signal is in a second threshold range and the duration of the temperature difference signal is less than a second time threshold, outputting a second alarm signal.
5. The transformer vacuum on-load tap changer monitoring system of claim 3, wherein the monitoring module comprises at least two alarm units; each alarm unit is correspondingly connected with the comparison unit; the alarm unit is used for alarming according to the first level signal and displaying alarm information.
6. The transformer vacuum on-load tap changer monitoring system of claim 2, wherein the temperature sensing unit and the oil temperature sensing unit employ fiber optic temperature sensors.
7. A transformer vacuum on-load tap-changer monitoring method, performed by the transformer vacuum on-load tap-changer monitoring system of any of claims 1-6, the method comprising:
the acquisition module acquires temperature information of a vacuum on-load tap-changer of the transformer to be detected; the temperature information comprises a temperature signal of a transfer switch contact plate of the transformer vacuum on-load tap-changer to be detected and an insulating oil temperature signal;
the diagnosis module acquires a temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judges according to the temperature difference signal and outputs a control signal;
and the monitoring module monitors according to the control signal.
8. The transformer vacuum on-load tap-changer monitoring method according to claim 7, characterized in that the collection module comprises at least two temperature sensing units and an oil temperature sensing unit; each temperature sensing unit is arranged on the corresponding change-over switch contact plate; the oil temperature sensing unit is arranged at the top layer oil position in an oil chamber of the transformer vacuum on-load tap-changer;
the collection module collects temperature information of the vacuum on-load tap-changer of the transformer to be detected, and the collection module comprises: the temperature sensing unit collects temperature signals of the contact plates of the change-over switches;
the oil temperature sensing unit collects temperature signals of the insulating oil top layer in the oil chamber.
9. The transformer vacuum on-load tap changer monitoring method of claim 8, wherein the diagnostic module comprises a temperature differential unit and a comparison unit;
the diagnosis module obtains a temperature difference signal between the temperature of the transfer switch contact plate and the temperature of the insulating oil according to the temperature signal of the transfer switch contact plate and the temperature signal of the insulating oil, judges according to the temperature difference signal and outputs a control signal, and comprises the following steps:
the temperature difference unit calculates a temperature difference signal between the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil;
the comparison unit compares the temperature difference signal with the threshold signal, and outputs a first level signal if the temperature difference signal is greater than the threshold signal; and outputting a second level signal when the temperature difference signal is less than or equal to the threshold signal, wherein the polarity of the first level signal is opposite to that of the second level signal.
10. The transformer vacuum on-load tap changer monitoring method of claim 9, wherein the diagnostic module further comprises a diagnostic unit;
the diagnosis module obtains the temperature difference signal of the temperature of the contact plate of the transfer switch and the temperature of the insulating oil according to the temperature signal of the contact plate of the transfer switch and the temperature signal of the insulating oil, judges according to the temperature difference signal and outputs a control signal, and the diagnosis module further comprises:
the diagnosis unit judges whether the temperature difference signal is in a first threshold range or a second threshold range, and if the temperature difference signal is in the first threshold range and the duration of the temperature difference signal is greater than a first time threshold, a first alarm signal is output; and if the temperature difference signal is in a second threshold range and the duration of the temperature difference signal is less than a second time threshold, outputting a second alarm signal.
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