KR20080035198A - Power transformer observation system using piezoelectric generator - Google Patents

Abstract

A power transformer monitoring system using a piezoelectric generator is provided to improve an electric efficiency by converting a vibration energy of a power transformer into an electric energy, and using the converted energy as a load power. A power transformer monitoring system using a piezoelectric generator includes a piezoelectric generator(202), a charging unit(203), and a monitoring unit(209). The piezoelectric generator converts a vibration energy generated from a power transformer into an electric energy. The charging unit charges the electric energy converted from the piezoelectric generator. The monitoring unit monitors a state of a transformer using the electric energy which is charged in the charging unit or the electric energy which is converted from the piezoelectric generator. The monitoring unit includes a sensor unit(207), an analog-digital converting unit(204), a micro control unit(205), a storing unit(208), and a transmission unit(206). The sensor unit senses a state of the transformer. The analog-digital converting unit converts analog data sensed in the sensor unit into digital data. The micro control unit stores and converts the converted digital data into data to be transmitted. The storing unit stores the converted digital data. The transmission unit transmits the converted digital data to the outside.

Description

Power transformer monitoring system using piezoelectric generators {Power Transformer Observation System using Piezoelectric Generator}

1 is a configuration diagram of a conventional power equipment monitoring system

2 is a block diagram of a power transformer monitoring system using a piezoelectric generator according to an embodiment of the present invention.

3 is a power transformer monitoring system using a piezoelectric generator according to an embodiment of the present invention

{Description of Signs of Major Parts of Drawings}

201: power transformer 202: piezoelectric generator

203: supercapacitor 204: analog-to-digital converter

205: microcontroller 206: transmitter

207: sensor portion 208: storage portion

The present invention relates to a power transformer monitoring system using a piezoelectric generator, and in particular, converts vibration energy generated from a power transformer into electrical energy for monitoring and diagnosing a power facility, and uses the sensor assembly as a power supply for a monitoring system. The present invention relates to a power transformer monitoring system configured with low power by applying a SoC and a power management technique to improve system reliability and system-in-package technique.

The power facility monitoring system refers to a system that monitors the state of a power facility installed at a site and provides a diagnosis and performance information to a remote site. The configuration is illustrated in FIG. 1.

However, the biggest disadvantage of the existing power facility monitoring system is that external power supply is required for power facility monitoring and diagnosis, and the complexity is generated by using wires for facility monitoring, and general sensors and independent devices which are not semiconductor based are used. Low power, system miniaturization is limited.

The diagnostic limit of the various elements of the power transformer is that the PD (partial discharge) and temperature monitoring of the power transformer are impossible, and only some elements are measured by using physical wires to monitor the condition of the power transformer.

In addition, the existing system uses the measuring transformer output power (220V) as the monitoring system power supply. The power equipment monitoring system environment is a high-voltage and high-current environment, and commercial power is supplied from outside for monitoring and diagnosis. This is not possible, and inefficiencies arise that require electricity bills to monitor millions of power installations scattered across the country.

In addition, by using independent sensors and processing systems, it is impossible to apply power management algorithms, which limits the miniaturization and low power of the system, and consists of AC / DC converter, RF modem, main board, LCD, and antenna. There arises a complexity problem, the ad hoc (ad-hoc) network application is impossible, the system function is suspended in the event of power failure and power transformer failure.

The present invention has been made to solve the above problems, an object of the present invention is to provide a monitoring system apparatus that can be miniaturized without the power supplied from the outside.

In order to achieve the above object, a power transformer monitoring system using the piezoelectric generator of the present invention includes a piezoelectric generator for converting vibration energy generated from a power transformer into electrical energy and a rechargeable battery for accumulating electrical energy converted from the piezoelectric generator. And a monitoring unit for monitoring a state of a transformer by using the electric energy accumulated in the rechargeable battery.

In the present invention, the rechargeable battery may use a super capacitor.

In the present invention, the monitoring unit is a sensor unit for monitoring the state of the transformer and the analog-digital conversion unit for converting the analog data monitored by the sensor unit to the digital data and the micro to store or transmit the digitally converted data into a data that can be transmitted A control unit, a storage unit for storing the digitally converted data, and a transmission unit for transmitting the digitally converted data to the outside.

In the present invention, the sensor unit may check the temperature occurring in the transformer, the current variation of the transformer and the partial discharge of the transformer.

In the present invention, the sensor unit may use a MEMS / NEMS semiconductor sensor.

In the present invention, the storage unit may use a flash memory.

In the present invention, the transmitter may perform RF communication using a low power SoC communication module.

In the present invention, the sensor unit may be manufactured using a system-in-package method.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

2 is a block diagram of a power transformer monitoring system using a piezoelectric generator according to an embodiment of the present invention.

In the above embodiment, the power transformer monitoring system includes a piezoelectric generator 202, a supercapacitor 203, an analog-to-digital converter 204, a microcontroller 205, a transmitter 206, a sensor 207 and Storage unit 208.

The embodiment schematically shows a miniaturized power transformer monitoring system that converts vibration energy generated from the power transformer 201 into electrical energy and uses the same.

Referring to Figure 2, looking at the process of operating the power transformer monitoring system of the present invention.

The power transformer 201 is a stationary induction device that converts an AC voltage using an electromagnetic induction theory as one of the power facilities. The power transformer 201 includes an iron core as a magnetic circuit and two or more windings constituting an electric circuit. It is a device that can adjust voltage step up and step down freely by adjusting, and vibration and noise occurs during the conversion process. That is, the power transformer 201 is a magnetic core, the core circuit winding, in addition to the voltage regulator tap voltage regulator, the voltage / current bushing for drawing, the insulation for insulation, insulating oil, the outer protection enclosure, the generated heat It is composed of a cooling device and various protection devices for discharging. The power transformer 201 generates noise / vibration due to magnetic attraction of an iron core, an external short circuit, or an overcurrent.

The noise of these transformers occurs in the cores, windings, and enclosures, and the noise of the core cores is the loudest. In general, the vibration frequency of the power transformer 201 is 120 kHz, 240 kHz, 360 kHz the main frequency, 120 kHz is the largest noise frequency.

Generally, the power transformer 201 includes an inflow type, a mold type, a dry type, a gas insulated type, and an amorphous type. The power transformer monitoring system of the present invention is applicable to any transformer if vibration occurs. This is possible. The vibration energy generated by the power transformer 201 is converted into electrical energy by a piezoelectric generator.

The piezoelectric generator 202 converts vibration energy generated from the power transformer 201 into electrical energy. The piezoelectric generator 202 converts the vibration energy generated from the power transformer 201 into a force, and converts the force into electrical energy. The piezoelectric oscillator 202 is preferably attached in close contact with the power transformer 201 enclosure or physically spaced apart appropriately in order to obtain the maximum power from the piezoelectric oscillator 202 and to attach to the point where it is resonated with the vibration. .

The electrical energy converted by the piezoelectric generator 202 is stored in the charging unit.

The charging unit 203 stores the electrical energy converted by the piezoelectric generator 202. The electrical energy stored in the charging unit 203 is used as a power source for the monitoring system of the present invention. In order to use the generated power in the load system, the power transformer 201 is provided with an electrostatic constant voltage / current circuit, which is converted into appropriate power and then supplied to the load system. At this time, since the power of the piezoelectric generator is used for the operation of the monitoring system, no external power is required, and the power transformer 201 uses power stored in the charging unit 203 even during non-vibration or power failure. Enable surveillance.

The charging unit 203 generally uses an element capable of storing electrical energy. In the present invention, it is preferable to use a supercapacitor.

The electric energy converted by the piezoelectric oscillator 202 or the electric energy stored in the charging unit 203 is used as a power source of the monitoring unit 209 for monitoring the state of the power transformer.

The monitoring unit 209 includes an analog-to-digital converter 204, a microcontroller 205, a transmitter 206, a sensor 207, and a storage 208.

The monitoring diagnostic elements of the power transformer 201 include temperature, current, and partial discharge. In order to monitor each element, the temperature is measured using a semiconductor-based temperature sensor such as MEMS / NENS, and the hall is measured. The current is measured using a sensor, and the partial discharge is measured using ultrasonic waves. Each of these sensors is preferably manufactured by a semiconductor lamination method based on MEMS / NENS. The fabrication of the sensor by the semiconductor stacking technology can achieve the effect of minimizing the physical size and improving the accuracy of low power multiplex signal processing and analysis. Each sensor is provided in the sensor unit 207.

The analog data measured by the sensor unit 207 is converted into a digital signal by the analog-digital converter 204 and then processed by the micro controller 205 and transmitted to the transmitter 206. The digital data is preferably transmitted to the transmitter 206 and stored in the storage 208 at the same time. The storage unit 208 may use a variety of storage media, in the present invention, it is preferable to use a flash memory to achieve the miniaturization of the object of the present invention.

The transmitter 206 preferably uses an RF method using a system on chip method. An RF communication module composed of a system on chip is driven with a minimum power of several tens of mA, and transmits a packet received from the micro controller to a backbone network through RF communication, and performs status monitoring of a power facility in an upper device for status monitoring. do. The RF communication is preferably configured as an ad hoc power IT backbone network.

The sensor unit 207 is preferably designed by a System-In-Package (SIP) technique. By interfacing the MEMS sensor, SoC communication module, and microcontroller 205 with the SIP method, a low power and temperature adaptation system is possible, and the physical size can be minimized. In addition, the system stability can be improved when applied to poor external power environment.

3 is applied to the power transformer monitoring system using a piezoelectric generator according to an embodiment of the present invention, it is preferable to attach in close contact with the power equipment and the power equipment support, or to be physically appropriately spaced apart from the power equipment. .

In addition, the piezoelectric oscillator in the monitoring system is preferably manufactured in the shape of resonating to the vibration frequency of the power transformer to obtain the maximum power.

As described above, although described with reference to the preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

As described above, according to the present invention, it is possible to reduce the failure rate of the monitoring system with the newly invented technology by drastically improving the shortcomings of the current power equipment monitoring system, and to facilitate the installation and operation, the extension of the service life and the system operating cost. There is an effect that can reduce.

In addition, by converting the vibration energy of the power transformer, which is the power equipment to be monitored, into electrical energy and using it as the load of the monitoring system, economic efficiency can be obtained by simplifying the system structure, reducing the possibility of an accident, and saving electric charges.

In addition, more than 1.73 million domestic power transformers (small and medium-sized power transformers), it is estimated that the electricity savings effect is significant.

Claims (9)

 A piezoelectric generator for converting vibration energy generated from a power transformer into electrical energy; A charging unit which accumulates the electric energy converted by the piezoelectric generator; And Power transformer monitoring system using a piezoelectric generator for supplying power to the monitoring unit for monitoring the state of the transformer using the electrical energy converted from the piezoelectric generator or the electrical energy accumulated in the charging unit. The method of claim 1, The charging unit is a power transformer monitoring system using a piezoelectric generator, characterized in that using a super capacitor. The method of claim 1, The monitoring unit includes a sensor unit for monitoring the state of the transformer; An analog-digital converting unit converting the analog data monitored by the sensor unit into digital data; A microcontroller which stores the digitally converted data and converts the data into transmittable data; And a storage unit storing the digitally converted data and a transmission unit transmitting the digitally converted data to the outside. The method of claim 3, wherein The sensor unit is a power transformer monitoring system using a piezoelectric generator, characterized in that for inspecting the temperature generated in the transformer, the current variation of the transformer, and the partial discharge of the transformer. The method of claim 3, wherein The sensor unit is a power transformer monitoring system using a piezoelectric generator, characterized in that using the MEMS / NEMS semiconductor sensor. The method of claim 1, The storage unit is a power transformer monitoring system using a piezoelectric generator, characterized in that using a flash memory. The method of claim 1, The transmission unit power transformer monitoring system using a piezoelectric generator, characterized in that for performing RF communication using a low power SoC communication module. The method according to claim 1 or 3, The sensor unit is a power transformer monitoring system using a piezoelectric generator, characterized in that manufactured using a system-in-package method. The method of claim 1, The piezoelectric oscillator is a power transformer monitoring system using a piezoelectric generator, characterized in that the structure is made of a structure resonant to the vibration frequency of the power transformer.

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