Transformer winding deformation on-line monitoring device

Abstract

The utility model relates to the technical field of power equipment state detection, in particular to a transformer winding deformation on-line monitoring device which comprises a monitoring module, the monitoring module comprises a first monitoring module, a second monitoring module and a communication module, and the first monitoring module comprises a power supply module and a judgment module. The power supply module is responsible for converting alternating-current voltage into direct-current voltage and storing the direct-current voltage and sending a signal to the judgment module when the alternating-current voltage is not received; the judgment module outputs an enable signal to the second monitoring module according to the signal of the power supply module or the internal temperature of the transformer so as to start a sensor in the second monitoring module to perform winding deformation monitoring; a pre-monitoring mechanism is adopted, the second monitoring module is started through signals output by the short circuit judgment circuit and the temperature judgment circuit to monitor the deformation condition of the transformer winding, and the technical problems that the state of the transformer winding in operation cannot be monitored in real time and winding deformation cannot be found and prevented in advance in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power equipment state detection technical field, specifically, relate to a transformer winding deformation on -line monitoring device. BACKGROUND

[0002] The transformer is the indispensable key equipment in the power system, and its main role is to change the alternating voltage by using the electromagnetic induction principle to meet the demand of different electrical equipment on voltage, and realize the efficient transmission and distribution of electric energy. For the power plant, the transformer can convert the high voltage and low current electric energy generated by the power plant into higher voltage and lower current form suitable for long distance power transmission, reducing the energy loss in the power transmission process. For the user end, the transformer reduces the received voltage to a level suitable for use, ensuring the safe and stable operation of various electrical equipment.

[0003] However, in the long-term operation process, the short circuit of the output end of the transformer is easy to cause the deformation problem of the transformer winding. When the short circuit occurs at the outlet of the transformer, the short circuit current will increase rapidly, and the electric power received by the winding will also increase sharply. If there is unreasonable place in the structure of the transformer itself or the mechanical strength is not enough, the deformation or displacement of the winding is easy to be caused. In addition, the complex vibration and dynamic force change of the winding in the short circuit process can also cause problems such as relaxation of insulation, misplacement of cushion block, loosening of iron core screw, etc., further aggravating the deformation of the winding. Severe winding deformation may cause interphase short circuit, winding burnout, and even transformer explosion and other serious accidents.

[0004] The traditional winding deformation monitoring method is to apply a low-voltage pulse signal to the transformer winding, measure the response waveform of the winding to the pulse, and then compare it with the original waveform to determine whether the winding has deformed. Although this method can effectively detect the winding deformation to a certain extent, it needs to be detected in the state of transformer shutdown, which not only increases the power-off time, but also brings inconvenience to the normal operation of the power system. Moreover, the traditional method needs to be detected at a specific time point, and cannot realize real-time monitoring of the transformer winding deformation, which has a certain lag. In addition, the sensitivity of the traditional method is relatively low when detecting early slight winding deformation, which may not be able to discover potential problems in time.

[0005] Therefore, it is of great significance to solve the technical problem of how to solve the problem that the existing technology cannot monitor the state of the running transformer winding in real time, discover and prevent the winding deformation in advance. UTILITY MODEL CONTENTS

[0006] The purpose of the present application is to provide a transformer winding deformation on-line monitoring device, which solves the technical problem that the existing technology cannot monitor the state of the running transformer winding in real time, discover and prevent the winding deformation in advance.

[0007] To solve the above technical problems, the application adopts the following scheme:

[0008] The utility model provides a transformer winding deformation on -line monitoring device, including monitoring module, its characterized in be: monitoring module includes first monitoring module, second monitoring module, communication module, first monitoring module, second monitoring module, communication module connect gradually,

[0009] The first monitoring module includes a power module and a judgment module. The input end of the power module is connected to the output end of the transformer. The control output end of the power module is connected to the input end of the judgment module. The output end of the judgment module is connected to the enable end of the second monitoring module.

[0010] The power module is used for receiving the alternating voltage output by the transformer and converting the alternating voltage into direct current voltage for storage. If the power module does not receive the alternating voltage, it sends a control signal to the input end of the judgment module.

[0011] The judgment module includes a short-circuit judgment circuit, a temperature judgment circuit and an output circuit. The input end of the short-circuit judgment circuit serves as the input end of the judgment module. The input end of the output circuit is connected to the short-circuit judgment circuit and the temperature judgment circuit respectively. The output end of the output circuit serves as the output end of the judgment module.

[0012] The short-circuit judgment circuit outputs a control signal to the output circuit according to the control signal sent by the power module.

[0013] The thermistor in the temperature judgment circuit is arranged inside the transformer to monitor the temperature. The temperature judgment circuit outputs a control signal to the output circuit according to the temperature data.

[0014] The output circuit receives the control signal of the short-circuit judgment circuit or the temperature judgment circuit and outputs an enable signal to the second monitoring module according to the control signal.

[0015] The second monitoring module starts to collect the vibration data or displacement data of the transformer winding according to the enable signal of the output circuit and outputs the vibration data or displacement data to the communication module.

[0016] The communication module is used for storing the received vibration data or displacement data.

[0017] In some embodiments, the short-circuit judging circuit comprises a photoelectric coupler, a transistor, and a plurality of resistors, the light-emitting input end of the photoelectric coupler is set as the input end of the short-circuit judging circuit, and the light-emitting output end of the photoelectric coupler is grounded; the light-receiving input end of the photoelectric coupler and the base of the transistor are connected and connected to the power supply through a resistor, and the light-receiving output end of the photoelectric coupler is grounded; the collector of the transistor is grounded through a resistor, and the emitter of the transistor is connected to the power supply through a resistor.

[0018] In some embodiments, the temperature judging circuit comprises a thermistor and a comparator, the thermistor is connected to the input end of the comparator, and the output end of the comparator is set as the output end of the temperature judging circuit.

[0019] In some embodiments, the output circuit comprises an OR gate, the input end of the OR gate is set as the input end of the output circuit, and the output end of the OR gate is set as the output end of the output circuit.

[0020] In some embodiments, the power supply module comprises a voltage conversion circuit and a battery charging and discharging circuit, the input end of the voltage conversion circuit is connected to the output end of the transformer, the first output end of the voltage conversion circuit is connected to the input end of the battery charging and discharging circuit, the second output end of the voltage conversion circuit is connected to the output end of the battery charging and discharging circuit, and the output end of the battery charging and discharging circuit is set as the power supply output end of the power supply module; and the control output end of the battery charging and discharging circuit is set as the control output end of the power supply module.

[0021] In some embodiments, the voltage conversion circuit comprises an isolation transformer, a bridge, a voltage stabilizer, and a first diode, the primary coil of the isolation transformer is connected to the transformer, the secondary coil of the isolation transformer, the bridge, the voltage stabilizer, and the first diode are connected in sequence, the output end of the voltage stabilizer is set as the first output end of the voltage conversion circuit, and the cathode of the first diode is set as the second output end of the voltage conversion circuit.

[0022] In some embodiments, the battery charging and discharging circuit comprises a battery management chip, a first field effect transistor, a second field effect transistor, a second diode, and a storage battery, the drain of the first field effect transistor, the enable end of the battery management chip, and the gate of the second field effect transistor are connected and set as the input end of the battery charging and discharging circuit, the gate and the source of the first field effect transistor are connected to the battery management chip, the source of the second field effect transistor, the positive electrode of the storage battery, and the battery connection end of the battery management chip are connected, the drain of the second field effect transistor and the anode of the second diode are connected and set as the control output end of the battery charging and discharging circuit, the cathode of the second diode is set as the output end of the battery charging and discharging circuit, and the negative electrode of the storage battery is grounded.

[0023] In some embodiments, the power output of the power module is connected to the power input of the judging module, the power input of the second monitoring module and the power input of the communication module to provide power.

[0024] In some embodiments, the second monitoring module is arranged inside the transformer, and the second monitoring module includes but is not limited to an ultrasonic sensor and a vibration sensor.

[0025] In some embodiments, the communication module includes a master control chip and a communication chip, the master control chip is connected to the second monitoring module to store the vibration data or displacement data transmitted by the second monitoring module, and the master control chip is connected to the communication chip, and the master control chip transmits the vibration data or displacement data to the monitoring end through the communication chip.

[0026] The technical scheme of the present application has at least the following advantages and beneficial effects:

[0027] The utility model discloses a monitoring module, monitoring module includes first monitoring module, second monitoring module, communication module, and first monitoring module includes power module and judging module, and power module is responsible for the storage of alternating voltage conversion direct current voltage, and sends signal to judging module when not receiving alternating voltage, and judging module judges the short circuit of transformer output end according to the signal of power module, or judging module real -time monitoring transformer internal temperature and judges temperature exception, and judging module exports enable signal to second monitoring module to start the sensor in second monitoring module and carries out winding deformation monitoring at this time. The utility model discloses a pre-monitoring mechanism, and the hierarchical start of monitoring system is realized through power state monitoring and temperature parameter analysis, solves the technical problem that the winding state of transformer in operation cannot be monitored in real time in the prior art, and the winding deformation is found in advance and prevented, realizes efficient monitoring while reducing energy consumption, and improves overall energy utilization efficiency.

[0028] 2, first monitoring module adopts integrated electronic device, therefore has simple structure and the advantage that cost is lower, and second monitoring module is only started when necessary, and this effectively reduces the wear and tear and aging problem of sensor and other key components due to long -time real -time monitoring. The design of pre-monitoring mechanism not only prolongs the service life of equipment, but also significantly reduces maintenance cost and equipment replacement frequency, thereby saving the expenditure for the user. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the signal flow chart of the utility model;

[0030] Figure 2 It is the judging module circuit diagram of the utility model;

[0031] Figure 3The power module circuit diagram of the utility model. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0033] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. If the orientation or position relationship indicated by the terms "center", "upper", "lower", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship when the product of the application is usually placed, which is only for the convenience of describing the application and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, structure and operation, therefore, cannot be understood as a limitation on the application. It should also be noted that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect" appear, they should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, can be electrically connected, can be directly connected, or indirectly connected through an intermediate medium, or can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0034] Embodiment 1

[0035] Please refer to Figure 1 The utility model provides a kind of transformer winding deformation on-line monitoring device, same as prior art, including monitoring module, the monitoring module is arranged in the periphery of the transformer;

[0036] In long-term operation, transformer output end short circuit is easy to cause winding deformation problem, and transformer local overheating can also aggravate the risk of winding deformation, so the monitoring module first monitors the temperature in the transformer and the short circuit condition of the output end of the transformer, if temperature anomaly or short circuit condition occurs, start monitoring the deformation of winding;

[0037] Different from prior art, monitoring module includes first monitoring module, second monitoring module, communication module, first monitoring module, second monitoring module, communication module are sequentially connected;

[0038] The first monitoring module comprises a power module and a judging module, the input end of the power module is connected with the output end of the transformer, the control output end of the power module is connected with the input end of the judging module, and the output end of the judging module is connected with the enable end of the second monitoring module;

[0039] The power module is used for receiving the alternating voltage output by the transformer and converting the alternating voltage into direct current voltage for storage, and when the power module does not receive the alternating voltage, a control signal is sent to the input end of the judging module;

[0040] The judging module comprises a short-circuit judging circuit, a temperature judging circuit and an output circuit, the input end of the short-circuit judging circuit is used as the input end of the judging module, the input ends of the output circuit are respectively connected with the short-circuit judging circuit and the temperature judging circuit, and the output end of the output circuit is used as the output end of the judging module;

[0041] The short-circuit judging circuit outputs a control signal to the output circuit according to the control signal sent by the power module;

[0042] The thermistor in the temperature judging circuit is arranged inside the transformer and close to the winding, is used for converting the temperature data inside the transformer into voltage data, judges whether the voltage data is normal and outputs a control signal to the output circuit according to the comparison result;

[0043] The output circuit receives the control signal of the short-circuit judging circuit or the temperature judging circuit and outputs an enable signal to the second monitoring module according to the control signal.

[0044] It should be explained that the first monitoring module is used for monitoring the temperature inside the transformer and the short-circuit condition of the output end of the transformer first, outputting a control signal to the second monitoring module according to the monitoring result to start the second monitoring module, through the pre-monitoring mechanism, the second monitoring module can be woken up only when an exception occurs and the detailed winding deformation monitoring can be carried out in a targeted manner, the sensors in the second monitoring module are prevented from running continuously, the service life of the sensors is prolonged, and the reliability of the device is enhanced;

[0045] It should be explained that the sensors in the second monitoring module are used for directly monitoring the deformation of the winding, therefore, the sensors in the second monitoring module selected in the utility model are all high-precision sensors, the sensors can more accurately detect the slight deformation of the winding, potential problems can be found in time, and the equipment failure caused by inaccurate monitoring can be avoided.

[0046] Further, the short circuit judging circuit comprises a photoelectric coupler, a triode, a plurality of resistors, the light emitting input end of the photoelectric coupler is set as the input end of the short circuit judging circuit, and the light emitting output end of the photoelectric coupler is grounded; the light receiving input end of the photoelectric coupler and the base of the triode are connected and connected to the power supply through a resistor, and the light receiving output end of the photoelectric coupler is grounded; the collector of the triode is grounded through a resistor, and the emitter of the triode is connected to the power supply through a resistor.

[0047] Further, the temperature judging circuit comprises a thermistor and a comparator, the thermistor is connected to the input end of the comparator, and the output end of the comparator is set as the output end of the temperature judging circuit.

[0048] Further, the output circuit comprises an OR gate, the input end of the OR gate is set as the input end of the output circuit, and the output end of the OR gate is set as the output end of the output circuit.

[0049] Specifically, as shown in Figure 2 the judging module comprises a photoelectric coupler U5, a comparator U6, an OR gate U7, a thermistor U8, a triode Q3, a general capacitor C8, and resistors R5, R6, R7, R8, R9, R10, R11 and R12.

[0050] Among them, the short circuit judging circuit comprises the photoelectric coupler U5, the triode Q3, and the resistors R5, R6, R7 and R8; the temperature judging circuit comprises the comparator U6, the thermistor U8, the general capacitor C8, and the resistors R9, R10, R11 and R12.

[0051] Further, the pin 1 of the photoelectric coupler U5 is set as the CON_IN input end, the pin 4 of the photoelectric coupler U5, one end of the resistor R5 and one end of the resistor R7 are connected, the other end of the resistor R5, one end of the resistor R6 and the pin 5 of the OR gate U7 are connected; the other end of the resistor R7 and the base of the triode Q3 are connected, the emitter of the triode Q3 and the other end of the resistor R6 are connected, the collector of the triode Q3, one end of the resistor R8 and the pin 1 of the OR gate are connected; the other end of the resistor R8, the pin 2 of the photoelectric coupler U5, the pin 4 of the photoelectric coupler U5, one end of the general capacitor C8, one end of the resistor R12 and one end of the thermistor U8 are connected and grounded; the other end of the thermistor U8, one end of the resistor R10 and one end of the resistor R11 are connected, one end of the resistor R9 and the other end of the resistor R10 are connected and connected to the power supply, the other end of the resistor R9, the other end of the resistor R12 and the pin 2 of the comparator U6 are connected, the other end of the resistor R11, the other end of the general capacitor C8 and the pin 3 of the comparator U6 are connected, the pin 4 of the comparator U6 is connected to the power supply and the pin 5 is grounded, the pin 1 of the comparator U6 and the pin 2 of the OR gate U7 are connected, the pin 3 of the OR gate U7 is grounded, and the pin 4 of the OR gate U7 is set as the OUT output end.

[0052] It should be noted that the CON_IN input end is connected with the control output end of the power module, and the OUT output end is connected with the enable end of the second monitoring module; the transistor Q3 is PNP type, the optocoupler U5 is used for isolating the circuit, the model number is PC357C, the model number of the comparator U6 is LM358, and the model number of the thermistor U8 is TMP6131DECR; the model number of the OR gate U7 is 74LVC1G32GW.

[0053] The working process of the judging module is as follows: when the CON_IN input end receives the control signal transmitted by the power module, the optocoupler is turned on, and then the transistor Q3 is turned on, at this time, the pin 1 of the OR gate U7 receives a high level, and then the pin 4 of the OR gate U7, that is, the OUT output end, outputs a high level to the second monitoring module to wake up the sensor in the second monitoring module.

[0054] The thermistor U8 monitors the internal temperature of the transformer in real time, and converts the temperature data into voltage data and transmits the voltage data to the comparator for comparison, when the comparator U6 judges that the temperature data is abnormal, the pin 1 of the comparator U6 outputs a high level to the pin 2 of the OR gate U7, and then the pin 4 of the OR gate U7, that is, the OUT output end, outputs a high level to the second monitoring module to wake up the sensor in the second monitoring module.

[0055] It should be explained that the pin 1 and the pin 2 of the OR gate U7 receive a high level together or any one of them receives a high level, and the output end of the OR gate U7 outputs a high level.

[0056] In the utility model, the power module includes voltage conversion circuit, battery charging and discharging circuit;The input end of voltage conversion circuit is connected with the output end of transformer, the first output end of voltage conversion circuit is connected with the input end of battery charging and discharging circuit respectively, the second output end of voltage conversion circuit is connected with the output end of battery charging and discharging circuit and is provided with output end as power output end of power module at this place;The control output end of battery charging and discharging circuit is as control output end of power module.

[0057] It should be noted that the power output end of the power module is connected with the power end of the judging module, the power end of the second monitoring module and the power end of the communication module to provide power.

[0058] Further, the voltage conversion circuit includes an isolation transformer, a bridge, a voltage stabilizer and a first diode, the primary coil of the isolation transformer is connected with the transformer, and the secondary coil of the isolation transformer, the bridge, the voltage stabilizer and the first diode are connected in sequence;The output end of the voltage stabilizer is as the first output end of the voltage conversion circuit, and the cathode of the first diode is as the second output end of the voltage conversion circuit.

[0059] In this embodiment, the role of the isolation transformer is to isolate the transformer and the first monitoring module, to prevent the output end of the transformer from short circuiting and causing damage to the first monitoring module; it needs to be explained that the above-mentioned transformer is the main transformer to be detected, and the isolation transformer is connected to the output end of the transformer.

[0060] Further, the battery charging and discharging circuit comprises a battery management chip, a first field effect transistor, a second field effect transistor, a second diode, a storage battery, the drain of the first field effect transistor, the enable end of the battery management chip, and the gate of the second field effect transistor are connected and an input end is arranged at the position as the input end of the battery charging and discharging circuit, the gate and the source of the first field effect transistor are connected to the battery management chip respectively; the source of the second field effect transistor, the positive electrode of the storage battery, and the battery connection end of the battery management chip are connected, the drain of the second field effect transistor and the anode of the second diode are connected and an output end is arranged at the position as the control output end of the battery charging and discharging circuit; the cathode of the second diode is the output end of the battery charging and discharging circuit; and the negative electrode of the storage battery is grounded.

[0061] Specifically, as shown in Figure 3 the power supply module comprises an isolation transformer U1, a voltage stabilizer U2, a power management chip U3, a storage battery U4, field effect transistors Q3 and Q4, general capacitors C2, C4, C5 and C7, polar capacitors C1, C3 and C6, diodes D5 and D6, and resistors R1, R2, R3 and R4.

[0062] Among them, the voltage conversion circuit comprises an isolation transformer U1, a voltage stabilizer U2, field effect transistors Q3 and Q4, general capacitors C2 and C4, polar capacitors C1 and C3, and diode D5; the battery charging and discharging circuit comprises a power management chip U3, a storage battery U4, field effect transistors Q1 and Q2, general capacitors C5 and C7, a polar capacitor C6, a diode D6, and resistors R1, R2, R3 and R4.

[0063] Among them, diodes D1, D2, D3 and D4 are connected into a bridge; field effect transistor Q1 is a first field effect transistor, and field effect transistor Q2 is a second field effect transistor; diode D5 is a first diode, and diode D6 is a second diode.

[0064] Specifically, the pin 1 and the pin 2 of the isolation transformer U1 are connected to the transformer output end to receive alternating current, the pin 3 of the isolation transformer U1, the cathode of the diode D1, the anode of the diode D3 are connected, the cathode of the diode D3, the cathode of the diode D4, the anode of the polarized capacitor C1, one end of the diode C2, the voltage stabilizer U2 are connected; the cathode of the diode D2, the anode of the diode D4, the pin 4 of the isolation transformer U1 are connected; the pin 3 of the voltage stabilizer U2, one end of the polarized capacitor C3, one end of the common capacitor C4, one end of the resistor R1, one end of the resistor R3, one end of the resistor R4, the gate of the field effect transistor Q2, the anode of the diode D5, the pin 8 of the power management chip U3 are connected, the cathode of the diode D5 and the cathode of the diode D6 are connected and the VCC output end is arranged at this position; the other end of the resistor R1 and the drain of the field effect transistor Q1 are connected, the gate of the field effect transistor Q1, the other end of the resistor R3, the pin 6 of the power management chip U3 are connected, the source of the field effect transistor Q1 and the pin 4 of the power management chip U3 are connected; the pin 1 and the pin 3 of the power management chip U3 and one end of the resistor R2 are connected and grounded, the other end of the resistor R2 and the pin 2 of the power management chip U3 are connected; the pin 7 of the power management chip U3 and the other end of the resistor R4 are connected, the pin 5 of the power management chip U3, one end of the common capacitor C7, one end of the common capacitor C5, one end of the polarized capacitor C6, the source of the field effect transistor Q2, the pin 1 of the battery U4 are connected, the other end of the common capacitor C7 and the pin 2 of the battery U4 are connected and grounded; the drain of the field effect transistor Q2 and the anode of the diode D6 are connected and the CON_OUT output end is arranged at this position.

[0065] It should be noted that the VCC output end is used as a power output end to supply power to the first monitoring module, the second monitoring module and the communication module; the CON_OUT output end and the CON_IN input end are connected; the model of the power management chip U3 is TP4056; the model of the isolation transformer U1 is DG-15KVA, and the model of the voltage stabilizer U2 is LM7805; the field effect transistor Q1 is an NMOS transistor, and the field effect transistor Q2 is a PMOS transistor;

[0066] The working process of the power module is as follows: the isolation transformer U1 receives the alternating current of the transformer output end, then the voltage output by the output end of U1 is processed in turn by the bridge and the voltage stabilizer U2, finally a stable voltage is obtained, and the VCC output end provides power supply for the judgment module, the second monitoring module and the communication module. At the same time, the field effect transistor Q2 is cut off, the field effect transistor Q1 is turned on, and the power management chip U3 starts to charge the battery U4 at this time; after being fully charged, the pin 6 of the power management chip U3 outputs low level, at this time the field effect transistor Q1 is cut off, and the power management chip U3 stops charging the battery U4;

[0067] If the transformer is short-circuited, the voltage output by the isolation transformer U1 will be reduced to a very low level or even zero, at this time the voltage output by the voltage stabilizer is 0, and the field effect transistor Q2 is triggered to open, and the field effect transistor Q1 is cut off, at this time, the power supply is switched to the battery U4, and at the same time, the control signal is output to the CON_IN input end from the CON_OUT output end to prompt that the output port of the transformer is in a short-circuit state.

[0068] The second monitoring module starts to collect vibration data or displacement data of the transformer winding according to the enable signal of the output circuit, and outputs the vibration data or displacement data to the communication module; the second monitoring module is arranged in the transformer and includes but is not limited to an ultrasonic sensor and a vibration sensor.

[0069] It should be noted that the ultrasonic sensor and the vibration sensor are high-precision sensors.

[0070] In the embodiment, the ultrasonic sensor is arranged on the outer wall of the transformer oil tank and is of the type UB2000-F54-E5-V15; the vibration sensor is arranged on the support structure of the winding and is of the type 331A; the enable ends of the ultrasonic sensor and the vibration sensor are connected to the OUT output end, and the data output ends of the ultrasonic sensor and the vibration sensor are connected to the IO port of the master control chip in the communication module.

[0071] The communication module is used for storing the received vibration data or displacement data; the communication module includes a master control chip and a communication chip; the master control chip is connected with the second monitoring module to store the vibration data or displacement data transmitted by the second monitoring module; the master control chip is connected with the communication chip, and the master control chip transmits the vibration data or displacement data to the monitoring end through the communication chip.

[0072] Specifically, after the master control chip receives the vibration data or displacement data transmitted by the second monitoring module, the master control chip processes and stores the data, and after the processing and storage are completed, the master control chip packages the vibration data or displacement data and transmits the vibration data or displacement data to the monitoring end through the communication chip, and the staff can check and take corresponding measures at the monitoring end.

[0073] It should be explained that in the embodiment, the master control chip is of the type STM32F103, and the communication chip is of the type SIM900A; because the focus of the utility model is the pre-monitoring mechanism, i.e., the first monitoring module, the connection between the master control chip and the communication chip adopts the prior art, which will not be described here.

[0074] The overall working process of the utility model is: the power module collects the electric energy at the output end of the transformer in real time, processes and stores the collected electric energy; when the output end of the transformer is short-circuited, the power module transmits a control signal to the judging module, the judging module judges and transmits an enable signal to start the sensor in the second monitoring module to monitor the winding deformation condition;

[0075] If the judging module monitors that the temperature inside the transformer is abnormal, the enable signal is transmitted to start the sensor in the second monitoring module to monitor the winding deformation condition.

[0076] It should be noted that the above electronic devices can be purchased in the domestic and foreign markets.

[0077] Thus, the embodiments of the utility model have been described in detail. In order to avoid shielding the concept of the utility model, some details known in the art are not described. According to the above description, those skilled in the art can fully understand how to implement the technical solutions of the utility model herein, and the scope of the utility model is defined by the appended claims.

Claims

1. An on-line monitoring device for transformer winding deformation, comprising a monitoring module, characterized in that: The monitoring module comprises a first monitoring module, a second monitoring module and a communication module, and the first monitoring module, the second monitoring module and the communication module are connected in sequence. The first monitoring module comprises a power module and a judging module, the input end of the power module is connected to the output end of the transformer, the control output end of the power module is connected to the input end of the judging module, and the output end of the judging module is connected to the enable end of the second monitoring module. The power module is used for receiving the alternating voltage output by the transformer and converting the alternating voltage into direct current voltage for storage, and the power module sends a control signal to the input end of the judging module when no alternating voltage is received. The judging module comprises a short-circuit judging circuit, a temperature judging circuit and an output circuit, the input end of the short-circuit judging circuit is used as the input end of the judging module, the input ends of the output circuit are respectively connected to the short-circuit judging circuit and the temperature judging circuit, and the output end of the output circuit is used as the output end of the judging module. The short-circuit judging circuit outputs a control signal to the output circuit according to the control signal sent by the power module. The thermistor in the temperature judging circuit is arranged inside the transformer and close to the winding to monitor the temperature, and the temperature judging circuit outputs a control signal to the output circuit according to the temperature data. The output circuit receives the control signal of the short-circuit judging circuit or the temperature judging circuit and outputs an enable signal to the second monitoring module according to the control signal. The second monitoring module starts to collect the vibration data or displacement data of the transformer winding according to the enable signal of the output circuit and outputs the vibration data or displacement data to the communication module. The communication module is used for storing the received vibration data or displacement data.

2. The transformer winding deformation on-line monitoring device according to claim 1, characterized in that, The short-circuit judging circuit comprises a photoelectric coupler, a transistor and a plurality of resistors, the light-emitting input end of the photoelectric coupler is used as the input end of the short-circuit judging circuit, the light-emitting output end of the photoelectric coupler is grounded, the light-receiving input end of the photoelectric coupler is connected to the base of the transistor and connected to the power supply through a resistor, the light-receiving output end of the photoelectric coupler is grounded, the collector of the transistor is grounded through a resistor, and the emitter of the transistor is connected to the power supply through a resistor.

3. The transformer winding deformation on-line monitoring device according to claim 1, characterized in that, The temperature judging circuit comprises a thermistor and a comparator, the thermistor is connected to the input end of the comparator, and the output end of the comparator is used as the output end of the temperature judging circuit.

4. The transformer winding deformation on-line monitoring device according to claim 1, characterized in that, The output circuit comprises an OR gate, the input ends of the OR gate are used as the input ends of the output circuit, and the output end of the OR gate is used as the output end of the output circuit.

5. The transformer winding deformation on-line monitoring device according to claim 1, characterized in that, The power module comprises a voltage conversion circuit and a battery charging and discharging circuit, the input end of the voltage conversion circuit is connected to the output end of the transformer, the first output end of the voltage conversion circuit is connected to the input end of the battery charging and discharging circuit, the second output end of the voltage conversion circuit is connected to the output end of the battery charging and discharging circuit and is provided with an output end as the power output end of the power module, and the control output end of the battery charging and discharging circuit is used as the control output end of the power module.

6. An on-line transformer winding deformation monitoring device according to claim 5, characterized in that, The voltage conversion circuit comprises an isolation transformer, a bridge, a voltage stabilizer, and a first diode, the primary coil of the isolation transformer is connected with the transformer, and the secondary coil of the isolation transformer, the bridge, the voltage stabilizer, and the first diode are connected in sequence; the output end of the voltage stabilizer is used as the first output end of the voltage conversion circuit, and the cathode of the first diode is used as the second output end of the voltage conversion circuit.

7. The transformer winding deformation on-line monitoring device according to claim 5, characterized in that, The battery charging and discharging circuit comprises a battery management chip, a first field effect transistor, a second field effect transistor, a second diode, and a storage battery, the drain of the first field effect transistor, the enable end of the battery management chip, and the gate of the second field effect transistor are connected and an input end is arranged at the position and used as the input end of the battery charging and discharging circuit, the gate and the source of the first field effect transistor are connected to the battery management chip respectively; the source of the second field effect transistor, the positive electrode of the storage battery, and the battery connection end of the battery management chip are connected, the drain of the second field effect transistor and the anode of the second diode are connected and an output end is arranged at the position and used as the control output end of the battery charging and discharging circuit; the cathode of the second diode is used as the output end of the battery charging and discharging circuit; and the negative electrode of the storage battery is grounded.

8. The transformer winding deformation on-line monitoring device according to claim 5, characterized in that, The power output ends of the power supply module are connected with the power supply ends of the judgment module, the second monitoring module, and the communication module respectively to provide power supply.

9. The transformer winding deformation on-line monitoring device according to claim 1, characterized in that, The second monitoring module is arranged in the transformer, and the second monitoring module comprises but is not limited to an ultrasonic sensor and a vibration sensor.

10. The transformer winding deformation on-line monitoring device according to claim 1, characterized in that, The communication module comprises a master control chip and a communication chip, the master control chip is connected with the second monitoring module to store vibration data or displacement data transmitted by the second monitoring module, the master control chip is connected with the communication chip, and the master control chip transmits the vibration data or displacement data to a monitoring end through the communication chip.

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