JP2005062080A - Lightening stroke current observation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightening stroke current observation device capable of easily placing by using a large diameter Logowski coil applied to a tower such as iron tower and exactly measuring the wave height and waveform of lightening stroke current and other lightening characteristics to make a guideline for lightening resistive design and permissible dose design. <P>SOLUTION: A Logowski coil 1 for wave height measurement is connected to an observation device 2 for wave height measurement. A Logouski coil 2 for waveform measurement is connected with an observation device 5 for waveform measurement. The lightening observation device is a device that the observation device 2 for wave height measurement is to output wave height data and the observation device 5 for waveform measurement is to output waveform data to an external monitor 6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lightning strike current observation apparatus suitable for measuring the peak value and waveform of a lightning strike current on a workpiece such as a wind power generator.

  In recent years, wind power generators have been in widespread use because they can obtain clean energy, and are installed in various places and installation plans are also being made. Such a wind turbine generator will be described with reference to the drawings. FIG. 8 is an explanatory diagram of the wind turbine generator. The wind power generator 1000 includes a tower body 100, a storage box 200, and a blade 300. The blade 300 further includes two or three wings 301, a head 302, and a rotor shaft 303. Such a wind turbine generator 1000 is laid on the foundation 400.

The tower body 100 is a steel tower in which, for example, hollow steel pipes are stacked in multiple stages (for example, three stages in FIG. 8) so as to have an internal space, and the container box 200 is rotatable at the upper end thereof. The storage box 200 is pivotally supported via a non-bearing bearing.
The storage box 200 stores therein a speed increaser (not shown), a generator (not shown) for generating power, or other control device (not shown).
The blade 300 includes two or three longitudinal blades 301. The wing 301 is formed of FRP, glass fiber, or the like.
These wings 301 are attached to a head 302, and a rotor shaft 303 is attached to the head 302. A speed increaser is directly connected to the rotor shaft 303. When the blade 300 rotates, the rotor shaft 303 rotates, and the rotation speed is increased by a speed increaser connected to the rotor shaft 303, and the generator generates power by the increased speed rotation.

  Such a wind power generator 1000 is installed in a place where the wind condition is good (a place where a strong wind blows for a long time). In Japan, where the wind condition is good is a large open hill in contact with the coastal shore, many of the wind power generators 1000 are laid in such a place. Due to such terrain restrictions and weather conditions, the wind power generation apparatus 1000 is exposed to a risk of lightning strikes. In particular, the wing 301 of the blade 300 is located at the highest position, as is apparent from FIG.

  Therefore, the wing 301 has a lightning conductor (not shown) embedded therein, and is formed into a wing shape by FRP, glass fiber, or the like so as to cover the periphery of the lightning conductor. Lightning protection is provided by grounding through a lightning conductor (not shown), a rotor shaft 301 as a conductor, and a tower body 100 as a conductor.

  However, the wing 301 may be explosively damaged due to instantaneous overheating when a lightning strike current of tens of thousands of amperes passes through the lightning conductor. When the wing 301, that is, the blade 300 is damaged, the wind power generator 1000 is not used at all, and there is a problem that the repair cost increases with the repair period. From such a problem, a lightning strike observation apparatus for the wind power generation apparatus 1000 is required to make the countermeasure for lightning damage stronger.

  In general, lightning in summer tends to have a high voltage but a lightning current is not so large and the time is short, and lightning in winter tends to have a large lightning current and a long time. In this way, lightning properties vary depending on the season. Depending on the lightning properties, the damage situation is different such that electronic components in the control device (not shown) of the wind turbine generator 1000 are destroyed by induced overvoltage, and appropriate lightning protection regardless of the behavior of the lightning properties. As a premise, there has been a demand for an observation apparatus that can reliably measure a lightning strike current with respect to the wind power generator 1000.

Although the present applicant is not using a wind power generator for such lightning strike current observation, the lightning observation device for a utility pole / power system as described in Patent Document 1 (title of the distribution line lightning observation system) The present invention has been filed, and this application has already been published.
In the distribution line lightning observation system according to the invention described in Patent Document 1, the lightning strike current received from the Rogowski coil is calculated and installed in the distribution facility, and remotely operated from the observation terminal board via the mobile phone line. It sends accurate lightning current data to the center equipment on the ground.
Patent Document 2 describes an invention relating to a current probe for measuring lightning surge current flowing in a large building.

JP-A-10-197652 (FIGS. 1 and 2) JP 2000-65866 A (paragraph numbers 0014 to 0025, FIGS. 1 to 11)

  The annular current sensor used in the “distribution line lightning observation system” according to the invention described in Patent Document 1 performs lightning observation using a small-diameter Rogowski coil that penetrates a ground wire or a lightning rod. However, it was simply not applicable to wind power generators. In lightning observation of a wind turbine generator, it is necessary to measure the current flowing through the pillars, beams, steel towers, etc. of the building.

  However, when the Rogowski coil is lengthened in order to increase the diameter, the high frequency characteristics are deteriorated due to the decrease in the resonance frequency due to the increase in the coil inductance and the stray capacitance of the coil return line. Depending on the frequency component included in the surge current to be measured, it is difficult to lengthen the Rogowski coil beyond a certain length, and it cannot be applied to the measurement of the lightning current as it is.

  Further, like the current probe described in Patent Document 2, in order to reduce the inductance and stray capacitance of the coil, a plurality of unit coils are combined to form a large-diameter annular Rogowski coil as a whole. A current probe that captures a lightning strike current flowing through a penetrating conductor is already known.

  However, in this type of current probe, an integrating circuit, an adding circuit, other limiting resistors, etc. are laid on each unit coil divided into a plurality of parts on the circumference. The holding and fixing tool that forms an annular shape is required, which has hindered its configuration and handling.

  Therefore, the present invention has been made to solve the above-described problems, and can be easily installed using a large-diameter Rogowski coil provided for a tower body such as a steel tower, and can also be designed for lightning and design. To provide a lightning strike current observation device capable of accurately measuring the peak value and waveform of lightning strike current and other lightning properties.

A lightning strike current observation apparatus according to claim 1 of the present invention is:
An annular current sensor that is mounted so that the base of the tower of the workpiece to be observed penetrates, and is inscribed through the insulator with the outer peripheral surface of the base of the tower,
An observation device for measuring the peak value, which calculates the current output from the annular current sensor and outputs the peak value data to the external monitoring device;
An observation device for waveform measurement that computes the current output from the annular current sensor and outputs the waveform data to an external monitoring device;
It is characterized by providing.

Moreover, the lightning strike current observation apparatus according to claim 2 of the present invention includes:
In the lightning strike current observation device according to claim 1,
The tower of the work being observed is
A flange formed at the base of the tower body;
A plurality of flange bolts for fixing the flange to the foundation,
It is equipped with
An annular current sensor is arranged in a groove portion having a substantially concave cross section formed by the outer peripheral portion of the tower body, the flange, and the flange bolt.

A lightning current observation apparatus according to claim 3 of the present invention is
In the lightning strike current observation device according to claim 1 or 2,
The tower of the work being observed is
A ground link buried in the ground around the foundation where the tower is erected and electrically connected to the tower via a ground wire;
A grounding electrode buried around the foundation and electrically connected to the grounding link via a grounding wire;
It is equipped with
The annular current sensor is mounted at a position parallel to the ground link.

Moreover, the lightning strike current observation apparatus according to claim 4 of the present invention includes:
In the lightning strike current observation device according to any one of claims 1 to 3,
The workpiece is
A blade constituting the windmill;
A housing box that rotatably supports a rotor shaft that holds a blade, and that houses a gearbox directly connected to the rotor shaft and a generator that generates power by rotating with the gearbox;
A tower supporting the containment box at the tip;
It is a wind power generator provided with.

Moreover, the lightning strike current observation apparatus according to claim 5 of the present invention is:
In the lightning strike current observation device according to any one of claims 1 to 4,
A mobile communication line is interposed between the external monitoring device and the observation device for measuring the peak value, and between the external monitoring device and the observation device for measuring the waveform.

Moreover, the lightning strike current observation apparatus according to claim 6 of the present invention includes:
In the lightning strike current observation device according to any one of claims 1 to 5,
The annular current sensor is a crest value measurement Rogowsky coil and a waveform measurement Rogowsky coil,
A crest value measuring Rogowsky coil is connected to the crest value measuring observation device, and a waviness measurement rogowsky coil is connected to the waveform measuring observation device.

A lightning strike current observation apparatus according to claim 7 of the present invention is
In the lightning strike current observation device according to claim 6,
The crest value measuring Rogowsky coil and the waveform measuring Rogowsky coil are characterized in that they are coils in which a closed loop is formed by one coil from the beginning of winding to the end of winding.

  According to the present invention as described above, a wave of a lightning current can be easily installed using a large-diameter Rogowski coil provided for a tower body such as a steel tower, and can be used as a guideline for lightning resistance design and resistance design. It is possible to provide a lightning strike current observation apparatus capable of accurately measuring high values, waveforms and other lightning properties.

The best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a lightning strike observation apparatus of the present embodiment installed in a wind power generator, FIG. 2 is an explanatory diagram for explaining the installation of a Rogowski coil, and FIG. 3 is an explanatory diagram for explaining grounding of the wind power generator. . As shown in FIG. 1, the lightning current observation apparatus includes a peak value measurement Rogowski coil 1, a peak value measurement observation apparatus 2, a UPS power supply apparatus 3, a waveform measurement Rogowsky coil 4, and a waveform measurement observation apparatus. 5 is provided. In addition, the external monitoring device 6 is communicably connected via a line (not shown).

  The peak value measuring logo whiskey coil 1 and the waveform measuring logo whiskey coil 4 of the lightning current observation device (hereinafter, these peak value measuring logo whiskey coil 1 and waveform measuring logo whiskey coil 4 are expressed as follows: Simply represented as Rogouski coils 1 and 4) is arranged at the base 101 of the tower body 100 of the wind turbine generator 1000.

  As shown in FIG. 2, the base portion 101 is specifically formed with a flange 102 integrally formed on the tower body 100, and a flange bolt 103 to be inserted into a hole (not shown) of the flange 102 is provided on the base portion 400. The tower body 100 is fixed on the foundation portion 400 by being fastened to the female screw portion (not shown). The Rogowski coils 1 and 4 are arranged on the inner side of the outer periphery of the tower body 100, the groove 102 formed by the flange 102 and the flange bolt 103 and having a substantially concave cross section.

  In this embodiment, the Rogowski coils 1 and 4 are arranged in two upper and lower stages. In addition, although the Rogowski coils 1 and 4 are not shown in figure, the insulation coating part is formed in the outer peripheral part, and it is considered so that a short circuit etc. may not occur. With such a configuration, a closed loop can be formed with one coil from the beginning of winding to the end of winding while inscribed with the outer peripheral surface of the tower body 100, and can be mounted very easily.

  Next, the grounding part will be described. As shown in FIG. 3, the base portion 400 of the hollow cylindrical tower body 100 is a stepped cylindrical base portion, and the periphery thereof is formed of concrete and firmly fixed. Further, the hollow cylindrical tower body 100, the ground link 105 penetrating the base portion 400, and the ground electrode 106 are electrically connected by the ground wire 104, and as indicated by an arrow in FIG. The lightning current that flows from the upper side of the tower body 100 to the ground electrode 106 at the time of the lightning strike does not flow locally, but escapes to the ground through the entire circumference of the base of the hollow cylinder.

As a result, even if the Rogowski coils 1 and 4 form a closed loop with a single coil from the beginning of winding to the end of winding and are elongated, the inscribed contact with the outer peripheral surface of the base 101 of the tower body 100 and the ground link Combined with the close parallel plane position mounting with 105, the inductance and stray capacitance of the Rogowski coils 1 and 4 are reduced to ensure high frequency characteristics, and the lightning current can be accurately measured.
The Rogowski coils 1 and 4 can accurately capture the lightning current flowing in the tower body 100 during a lightning strike on the wind power generator 1000.

Next, the circuit block will be described. FIG. 4 is an explanatory diagram for explaining a peak value measurement block.
The peak value measurement observation device 2 includes an integration circuit 2a, a positive polarity peak hold circuit 2b, a negative polarity peak hold circuit 2c, a memory 2d, a signal processing unit 2e, a clock unit 2f, a communication unit 2g, an antenna 2h, and a power supply unit 2i. I have.

The power supply unit 2i is connected to the UPS power supply device 3, and supplies power to each unit without being interrupted even if there is a lightning strike or the like.
The lightning strike current captured from the peak value measuring Rogowsky coil 1 is integrated by the integrating circuit 2a and output to the positive polarity peak hold circuit 2b and the negative polarity peak hold circuit 2c. The positive polarity peak hold circuit 2b and the negative polarity peak hold circuit 2c have a trigger function, and are configured to operate when a current exceeding a predetermined value (for example, 2 kA for both positive and negative) is input. When a current exceeding a predetermined value is input, the peak value of the positive electrode is peak-held by the positive polarity peak hold circuit 2b and the peak hold value is output to the signal processing unit 2e, and the negative value is held by the negative polarity peak hold circuit 2c. Is peak-held and the peak hold value is output to the signal processing unit 2e.

  The signal processing unit 2e temporarily stores these peak hold values, further reads the time when the lightning strike occurs (trigger generation time) from the clock unit 2f, and registers the peak value data combining them in the memory 2d. When the time obtained from the clock unit 2f reaches a predetermined time (for example, every hour), the signal processing unit 2e reads the peak value data from the memory 2d and transmits it to the communication unit 2g. The communication unit 2g generates communication data and transmits it from the antenna 2h to the terminal device 6b connected to the PHS phone 6a of the external monitoring device 6 via a PHS line (not shown).

FIG. 5 is an explanatory diagram for explaining the waveform measurement block.
The waveform measurement observation apparatus 5 includes a GPS (Global Positioning System) antenna 5a, a GPS clock unit 5b, an arithmetic processing unit (CPU) 5c, a data storage unit 5d, a waveform processing unit 5e, and a sensor interface unit (sensor I / F unit). 5f, a system bus 5g, a power supply control unit 5h, a power supply unit 5i, a mobile phone antenna 5j, a mobile phone 5k, a TA (Terminal Adapter) 5l, a serial communication processing unit 5m, and an auxiliary battery 5n.

The power supply unit 5i is connected to the UPS power supply device 3, and supplies power to each unit without being interrupted even if there is a lightning strike or the like. In addition, the auxiliary battery 5n is connected to avoid a situation in which power is supplied even during a power failure and communication becomes impossible.
The lightning strike current captured from the Rogowski coil 4 for waveform measurement is converted into a voltage signal by the sensor I / F unit 5f, converted into data relating to a digital waveform by the waveform processing unit 5e, and is processed via the system bus 5g. The unit (CPU) 5c is reading. The arithmetic processing unit (CPU) 5c has a trigger function and controls to start waveform measurement when a current exceeding a predetermined value (for example, positive and negative 1 kA) is input.

  The GPS clock unit 5b outputs time data by a GPS clock function based on a GPS signal input via the GPS antenna 5a, and a unit calculation processing unit (CPU) 5c reads the time data at the time of trigger occurrence. Waveform data obtained by combining the waveform and time-related data is generated and stored in the data storage unit 5d.

When the time obtained from the GPS clock unit 5b reaches a predetermined time (for example, every hour), the arithmetic processing unit (CPU) 5c reads the waveform data from the data storage unit 5d and transmits it to the serial communication processing unit 5m. The serial communication processing unit 5m generates communication data including waveform data, and transmits the communication data to the external monitoring device 6 (see FIG. 1) from the mobile phone antenna 5j via the mobile phone line (not shown) by the TA 5l and the mobile phone 5k. .
The external monitoring device 6 performs various types of monitoring using the acquired peak value data and waveform data.

  Subsequently, an observation example will be described. FIG. 6 is a waveform diagram of the entire waveform of the observed lightning current waveform, and FIG. 7 is a waveform diagram of an enlarged waveform of the time axis of the observed lightning current waveform. The observed lightning current waveform is a negative lightning stroke, and it can be confirmed that the peak value is −20 kA. As described above, the lightning strike current observation apparatus according to the present invention can grasp lightning properties and collect effective data as a guideline for lightning resistance design and resistance design.

  In the description of this embodiment, the lightning strike current observation device is described as being applied to a wind power generator. However, this is an example of an application form of the lightning current observation device, and can be applied to various other works (for example, lightning rods) and high-rise buildings (for example, chimneys).

In addition, although each of the logo whiskey coils is divided into a peak value measurement and a waveform measurement for convenience, one logo whiskey coil may serve both as a peak value measurement and a waveform measurement.
However, by separating the Rogowski coil, it is possible to determine various configurations and setting values so that the peak value measurement observation device is optimal for peak value measurement. Similarly, the waveform measurement observation device can also perform waveform measurement. Separation is preferable because various configurations and setting values can be determined so as to be optimal.

  In addition, although FIG. 1 has been described on the assumption that the block configuration for measuring the peak value and the block configuration for measuring the waveform are accommodated in a storage box (not shown) outside the tower body, the block for measuring the peak value and the waveform measurement are also provided. It is also possible to adopt a configuration in which the block configuration is housed inside the tower body, the cable is drawn out from the tower body and connected to the Rogowski coil, and the antenna is installed outside the tower body.

The present embodiment has been described above.
Thus, in the lightning strike current observation apparatus according to the present invention, in particular, by using a large-diameter logo owski coil, it can be easily installed in a large facility having a tower body, and the lightning current has a peak value, waveform, etc. Various data can be measured and collected accurately. And based on these data, it becomes easy to take appropriate lightning protection measures for all large facilities including wind power generators.

It is a block diagram of the lightning strike observation apparatus of the best form for implementing this invention installed in the wind power generator. It is explanatory drawing explaining installation of a Rogowski coil. It is explanatory drawing explaining the earthing | grounding of a wind power generator. It is explanatory drawing explaining a peak value measurement block. It is explanatory drawing explaining a waveform measurement block. It is a wave form diagram of the whole waveform of the observed lightning strike current waveform. It is a wave form diagram of the time-axis enlarged waveform of the observed lightning strike current waveform. It is explanatory drawing of a wind power generator.

Explanation of symbols

1: Rogowski coil 2 for measuring peak value 2: Observation device 2a for measuring peak value: Integration circuit 2b: Positive peak hold circuit 2c: Negative peak hold circuit 2d: Memory 2e: Signal processing unit 2f: Clock unit 2g: Communication unit 2h: Antenna 2i: Power supply unit 3: UPS power supply device 4: Waveform measurement logo whiskey coil 5: Waveform measurement observation device 5a: GPS (Global Positioning System) antenna 5b: GPS clock unit 5c: Arithmetic processing unit ( CPU)
5d: data storage unit 5e: waveform processing unit 5f: sensor interface unit (sensor I / F unit)
5g: System bus 5h: Power supply control unit 5i: Power supply unit 5j: Mobile phone antenna 5k: Mobile phone 5l: TA (Terminal Adapter)
5m: serial communication processing unit 5n: auxiliary battery 6: external monitoring device 6a: PHS phone 6b: terminal device 1000: wind power generator 100: tower body 101: root portion 102: flange 103: flange bolt 104: ground wire 105: ground Link 106: Grounding electrode 200: Storage box 300: Blade 301: Wing 302: Head 303: Rotor shaft 400: Foundation

Claims (7)

An annular current sensor that is mounted so that the base of the tower of the workpiece to be observed penetrates, and is inscribed through the insulator with the outer peripheral surface of the base of the tower,
An observation device for measuring the peak value, which calculates the current output from the annular current sensor and outputs the peak value data to the external monitoring device;
An observation device for waveform measurement that computes the current output from the annular current sensor and outputs the waveform data to an external monitoring device;
A lightning current observation device comprising: In the lightning strike current observation device according to claim 1,
The tower of the work being observed is
A flange formed at the base of the tower body;
A plurality of flange bolts for fixing the flange to the foundation,
It is equipped with
A lightning strike current observing device, characterized in that an annular current sensor is disposed in a groove having a substantially concave cross section formed by an outer peripheral portion of a tower body, a flange, and a flange bolt. In the lightning strike current observation device according to claim 1 or 2,
The tower of the work being observed is
A ground link buried in the ground around the foundation where the tower is erected and electrically connected to the tower via a ground wire;
A grounding electrode buried around the foundation and electrically connected to the grounding link via a grounding wire;
It is equipped with
An annular current sensor is mounted at a position parallel to the ground link, and is a lightning current observation device. In the lightning strike current observation device according to any one of claims 1 to 3,
The workpiece is
A blade constituting the windmill;
A housing box that rotatably supports a rotor shaft that holds a blade, and that houses a gearbox directly connected to the rotor shaft and a generator that generates power by rotating with the gearbox;
A tower supporting the containment box at the tip;
A lightning current observing device, characterized by being a wind power generator. In the lightning strike current observation device according to any one of claims 1 to 4,
A lightning strike current observation device characterized in that a mobile communication line is interposed between an external monitoring device and a peak value measurement observation device and between the external monitoring device and a waveform measurement observation device. In the lightning strike current observation device according to any one of claims 1 to 5,
The annular current sensor is a crest value measurement Rogowsky coil and a waveform measurement Rogowsky coil,
A thunderbolt current observation device, characterized in that a crest value measurement Rogowsky coil is connected to a crest value measurement observation device, and a waveform measurement rogowsky coil is connected to the waveform measurement observation device. In the lightning strike current observation device according to claim 6,
A thunderbolt current observing apparatus, wherein a peak value measuring logoowski coil and a waveform measuring logoowski coil are coils that form a closed loop with one coil from the beginning to the end of winding.

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