KR100694818B1 - Self-powered type sensor communication module for the transformer on electricity pole and load management system using the same - Google Patents

Abstract

No need of external power supply, accurate current measurement without current limitation, and sensor communication module that can build load management system using its own communication network.

A sensor communication module for detecting a current of a secondary port of a column transformer and transmitting the value through a communication circuit unit, the sensor communication module comprising: a sensor unit for detecting a current of the secondary port of the column transformer and a current input from the sensor unit A conversion unit for processing a voltage into a voltage form required for communication, a communication circuit unit for transmitting voltage information received from the conversion unit, and a power generation unit for supplying power required for the sensor unit, the conversion unit, and the communication circuit unit. The power generating unit includes: (1) a current transformer provided at a wire of a secondary side port of the column transformer, (2) an AC-DC converter for converting an AC current induced by magnetic field induction in the current transformer into a DC current, and (3) Provided is a self-powered sensor communication module for a column transformer comprising a rectifier for rectifying the DC current.

Column transformer, current transformer, air core coil, induction current, sensor

Description

Self-powered type sensor communication module for the transformer on electricity pole and load management system using the same}

1 is a block diagram of a sensor communication module of a columnar transformer according to the prior art.

2 is a block diagram of a self-powered sensor communication module of a columnar transformer according to the present invention.

3 is an exemplary view illustrating a configuration of a local sensor network for load management of a columnar transformer of a load management system using a self-powered sensor communication module of a columnar transformer of the present invention.

4 is an exemplary diagram of a configuration of a wide area sensor network for a load management system of a load management system using a self-powered sensor communication module of a column transformer of the present invention.

The present invention relates to a self-powered sensor communication module for a column transformer and a load management system using the same. More specifically, a self-powered sensor is used to detect a current without external power supply, and the current information is used for sensor communication. The present invention relates to a self-powered sensor communication module for columnar transformers and a load management system using the same, which are transmitted through a module to a network to centrally manage current load of each columnar transformer.

Generally, pole pole transformers are installed in electric poles for electricity supply or communication. The primary side of this columnar transformer is connected to the supply side of a power plant, substation, etc., and the secondary side is connected to the substation or customer below. Therefore, there is a need for a means or method for detecting how much current flows in the wire on the secondary side where the amount of current changes as power demand occurs.

In the related art, in order to measure the load current of the columnar transformer using a hook meter, a work type in which a person climbs directly to a pole is taken. In this case, however, there was an inconvenience that a person had to climb the electric pole, the risk of safety accidents due to the fall, and the risk of electric shock was very high, and accordingly, it took a lot of time, manpower and budget, and carried out practically. This was a difficult situation.

So, what was developed to improve this is the equipment for load control of columnar transformers installed on poles.

The conventional columnar transformer load management equipment is installed to detect a current flowing in a wire coming from the secondary port 100 of the transformer and transmit this current value to the management station, as shown in FIG. This equipment includes a sensor unit 210 for detecting a current from a wire of the transformer secondary port 100, a converter 220 for converting a current value into a direct current value, and a current value for load management. It is composed of a communication unit 230 for transmitting, in particular, the sensor unit 210 and the conversion unit 220 collectively referred to as a current detection module, and the communication unit 230 collectively referred to as a sensor communication module 200.

A current transformer (CT) 212 is mounted inside the sensor unit 210 as a main component. The current detected by the current transformer 212 is transmitted to the converter 220. In the conversion unit 220, the current is first converted into a DC voltage at the AC-DC detector 222, the voltage level is converted to a level suitable for communication in the level converter 224, and then transferred to the communication unit 230. . The communication unit 230 is transmitted to the management office for management using a conventional mobile communication method, for example, a mobile communication terminal of commercial mobile communication using CDMA.

On the other hand, the AC-DC detector 222, the level converter 224, and the communication unit 230 constituting the above-described components, that is, the converter 220, require electric power in their driving. Therefore, in order to supply power to each of these components, the power is configured to be supplied from a separate external power source 226.

However, in the current detection module of the prior art, the following problems occur.

(1) Since the external power source 226 is used as the power source of the equipment, a separate power connection means is required, and in principle, it cannot be used where the external power source 226 is not provided.

(2) Since the measured current load data is transmitted by the communication unit 230 using a mobile communication network using a commercial mobile communication terminal, a cost of using a commercial communication network is incurred.

(3) In addition, since the current transformer 212 is wound around a magnetic core, a problem arises in that the measurement current is limited or hysteresis occurs due to the magnetic saturation of the current transformer 212 winding core. . Therefore, there is a disadvantage in that an extremely inaccurate value is detected for a current outside the current range predetermined according to the characteristics of the magnetic core.

The present invention has been made to solve the above problems, to provide a sensor communication module that can always accurately measure the amount of current regardless of the amount of current load.

In addition, to provide a sensor communication module that can directly take the power from the current flowing in the wire, without the need for a separate external power source.

In addition, it is to provide a sensor communication module without the burden of communication costs by allowing a device installed in each pole to form a short-range wireless network without using commercial mobile communication.

In order to achieve the above object, the self-powered sensor communication module for columnar transformer of the present invention, in the sensor communication module for detecting the current of the secondary port of the columnar transformer, and transmitting the value through the communication circuit unit, A sensor unit for detecting a current of a secondary port of a transformer, a converter for processing a current input from the sensor unit into a voltage form necessary for communication, a communication circuit unit for transmitting voltage information received from the converter, And a power generation unit for supplying power required for the sensor unit, the conversion unit, and the communication circuit unit, wherein the power generation unit includes: (1) a current transformer installed at a wire of a secondary side port of the columnar transformer, and (2) a magnetic field induction in the current transformer. AC-DC converter for converting the AC current induced by the DC current, and (3) a rectifier for rectifying the DC current.

Here, the current detecting sensor constituting the sensor unit is preferably an air core coil installed on the wire of the secondary port of the column transformer, and in particular, the air core coil is preferably a Rogowski air core coil.

The communication circuit unit preferably uses a radio frequency for RF ID / USN.

On the other hand, in order to achieve the above object, the load management system using the self-powered sensor communication module for the columnar transformer of the present invention, the control station computer that performs the integrated management of the sensor network and the current load is connected to a plurality of the sensor communication module A load management system using the sensor network, wherein each sensor communication module is configured as one of the multi-level upper and lower node systems, and each node includes a current value transmitted from its lower node together with current value information detected by the respective node. The information is repeatedly transmitted to the upper node immediately above, and is configured to be transmitted from the last upper node to the management station computer.

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Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

The sensor communication module of the present invention is largely composed of three technical areas. And, the load management system of the present invention is composed of a network technology using the communication function of the sensor communication module.

The three technical areas constituting the sensor communication module of the present invention are, firstly, a Rogowski hollow core coil for detecting a load current of a columnar transformer, and a sensor part including a current transformer for inducing and outputting a load current to an alternating current in a magnetic field induction method. Secondly, a converter for rectifying the load current detected in the air core coil and converting it into a DC level which is easy to convert into data in the communication module, and rectifying the AC current induced in the current transformer to direct the DC to the sensor unit, the converter, and the communication circuit. It consists of the technology of the conversion section which is an electronic circuit for supplying power, and thirdly, the data of current value data and the control of the RF section, and the technology of the communication circuit section for transmitting and receiving the data wirelessly.

2 is a block diagram of a self-powered sensor communication module of a columnar transformer according to the present invention.

As shown in FIG. 2, the sensor unit 310 of the present invention includes an air core coil 312 for detecting a current, and a current transformer 314 for inducing and using the current as a power source. These are all installed on the wires coming from the secondary port 100 of the column transformer. In the present invention, the use of the air core coil 312 as a sensor for detecting the current is different from the use of the current transformer 212 in the prior art. The reason why the hollow core coil 312 is used is that since the current transformer 212 uses a magnetic core, it has various nonlinear factors represented by hysteresis, which limits the range of current values that can be detected with accuracy. In spite of the fact, in reality, the power consumption form exceeding a proper range such as excessive use of air conditioner and excessive use of electric heating occurs at a specific time. Therefore, very inaccurate current value is generated due to magnetic saturation associated with the magnetic core. Because it makes it detectable. This is a big disadvantage as a sensor, and the air core coil 312 does not have this disadvantage.

On the other hand, the sensor unit 310 of the present invention further uses the current transformer 314 to induce a current to utilize as a power source. Although the current transformer has a non-linear element as described above, since the magnetic core is used, the current transformer is highly sensitive to a weak current, so that the output current also appears large. Therefore, in the present invention, it is used for power induction.

First, the air core coil 312 system for detecting the current will be described.

As the air core coil 312, it is particularly preferable to use a Rogowski air core coil. The Rogowski air core coil is, as is well known, a coil that is wound so as to start winding the coil at one end to reach the other end, and then back to successively again at its starting point. The advantage of this coil is that it is strong in linearity and weak inductance but high frequency and high current detection.

The air core coil 312 can detect a load current flowing through the transformer secondary port 100, for example, from several [A] to several hundred [A]. The detected AC current is converted into a DC voltage by the AC-DC detector 322 of the conversion circuit unit 320, the level is converted by the level converter 324, and transferred to the communication circuit unit 330. Then, the communication circuit unit 330, after applying a conventional technique for digital data communication, for example, converting into binary data using the A / D converter 331, and transmits to the wireless communication. In this case, the conventional wireless communication technique, for example, the modulator 332 may be modulated into a specific high frequency signal and transmitted to the air through the antenna 333. The communication circuit unit further includes a control unit and a memory unit, and the memory unit stores a program for configuring and executing a sensor network and data necessary for communication, and the control unit loads the program and data. Functions to run sensor network. For reference, the frequency used for the wireless communication is preferably set to a radio frequency for RFID / USN. That is, RFID / USN stands for "Radio Frequency IDentification / Ubiquitous Sensor Network", and the sensor network using the sensor communication module according to the present invention can be used as the USN of the RFID / USN.

Next, look at the current transformer 314 system.

After the AC current induced by the magnetic field induction in the current transformer 314 of the sensor unit 310 of the present invention becomes a DC value through the AC-DC converter 326 and is adjusted through a rectifier 328, Is output. The output is used as a power source required by the sensor unit 310, the AC-DC detector 322 of the conversion circuit unit 320, the level converter 324, or the communication circuit unit 330.

The sensor unit 310 and the conversion circuit unit 320 may be collectively referred to as a current detection module, and the communication circuit unit 330 may be collectively referred to as the sensor communication module 300 of the present invention.

Hereinafter, a sensor network formed by connecting a plurality of sensor communication modules 300 as nodes will be described.

3 is an exemplary diagram illustrating a configuration of a local area sensor network for load management of a load management system using a self-powered sensor communication module of a column transformer of the present invention.

The nodes constituting the sensor network are composed of multi-level upper and lower nodes such as end points, router nodes, and gateway nodes. The value of the current measured at the end node is transmitted to the gateway node by selecting a path to be transmitted through the router node, and the router node receives the load current data and data of other end nodes and router nodes from the gateway node. It performs the function of passing to.

At this time, the data transmission of each node uses a common multiplexing method that passes through several nodes. Each node is used, for example, as a cluster tree network in which a mesh network and a star network are combined, and the load current measured at each node is collected at the final gateway node and is connected to an external network. It is sent to a higher communication unit or management station computer.

FIG. 4 is an exemplary diagram of a configuration of a wide area sensor network for a columnar transformer load management of a load management system using a self-powered sensor communication module of a columnar transformer of the present invention.

A gateway node is provided in a sensor communication module of a pole pole transformer of a pole of a pole having a communication circuit unit 330 connected to the management station computer 400 by wire, and the network is composed of N, for example, 6 cluster units. Each cluster has a structure that transmits the current load data in the cluster and the current load data from another cluster to the gateway node through the node serving as a router node. In a cluster, current load data of each end node and current load data of another router node are transmitted to a router representing the cluster. If the representative node of the cluster does not operate, the router node has a function of determining the transmission path setting so that the current load data can be transmitted to other router nodes. The load management system of the columnar transformer for wiring can be designed in a somewhat complicated wireless network network by extending the basic network network.

As described above, in the detection of the current, the present invention uses an air core coil 312, in particular, a Rogowski air core coil 312, so that the magnetic history, hysteresis, Since no problem such as magnetic saturation occurs, the current measurement range is not limited, and linearly accurate measurement is possible.

In addition, since the current coming from the secondary side port 100 of the columnar transformer is rectified by the current transformer 314 and used as a power source, the sensor communication module 300 can be used semi-permanently without using an external power source or a battery.

As described above, the sensor communication module 300 of the present invention measures the load current of the columnar transformer and transmits the load change data of the transformer or the customer to the corresponding management station computer 400 in real time through the wireless data communication network. Can be.

In addition, load current data for distribution-type columnar transformers distributed throughout the country are not directly measured by humans, which is extremely efficient in terms of time, cost, and safety.

In addition, in the transmission of measurement data, a sensor network is constructed using a local area network or a wide area network, without using a commercial mobile communication network, and using a high frequency signal (radio frequency for RFID / USN). Since the measurement data can be transmitted, the time required for measurement can be reduced, and unnecessary costs such as communication network usage fee can be reduced when using the mobile communication network 230.

Claims (5)

In the sensor communication module for detecting the current of the secondary side port of the columnar transformer, and transmitting the current value through the communication circuit unit, A sensor unit for detecting current of the secondary port of the column transformer; A converting unit for processing a current received from the sensor unit into a voltage form necessary for communication; Communication circuit unit for transmitting the voltage information received from the conversion unit; It is composed of a power generating unit for supplying power required for the sensor unit, the conversion unit and the communication circuit unit The power generation unit, (1) current transformers installed on the wires of the secondary port of the column transformer, (2) an AC-DC converter for converting an AC current induced by magnetic field induction into a DC current in the current transformer; (3) rectifier for rectifying the DC current Self-powered sensor communication module for columnar transformer, characterized in that consisting of. The method according to claim 1, The current detection sensor constituting the sensor unit is a self-powered sensor communication module for a column transformer, characterized in that the air core coil installed in the wire of the secondary side port of the column transformer. The method according to claim 2, The air core coil is a Rogowski air core coil, the self-powered sensor communication module for a column transformer. The method according to claim 1, The communication circuit unit, a self-powered sensor communication module for a pole transformer, characterized in that for using the radio frequency for RFID / USN. A load management system using a sensor network including a plurality of sensor communication modules of any one of claims 1 to 4 connected thereto, and a management station computer that performs integrated management of current load, In the sensor network, each sensor communication module is configured as one of the multi-level upper and lower node systems, and each node includes the current value information transmitted from its subordinate node together with the current value information detected by itself . Repeatedly delivered to the upper node, the load management system using a self-powered sensor communication module for a pole transformer, characterized in that configured to be delivered to the management station computer from the last upper node.

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