JPH06201734A - Higher harmonic detecting device for high voltage distribution line - Google Patents

Abstract

PURPOSE:To measure a higher harmonic on the way of a high voltage distribution line, surely track and specify a position of a generation source thereof by measuring sequentially so as to rationalize work for detecting the higher harmonic and to realize stabilized supply of an excellent quality power source. CONSTITUTION:A higher harmonic detecting device is constituted of a sensor part 1 provided with a clamp current transformer 3 for clamping a high voltage distribution line 14 to detect a phase current, a voltage detecting electrode 4 arranged adjacent to the clamp current transformer 3 for detecting in an electrostatic induction manner a phase voltage of the clamped high voltage distribution line 14, and a transmitter for converting the detected phase current and the detected phase voltage into signals electrically insulated from the high voltage distribution line 14 and transmitting them; and a device main body part 2 provided with a control means 8 composed of a higher harmonic analyzing part for receiving the signals from the transmitter and analyzing respective order higher harmonic voltage/current components contained in the signals, and a storage part for storing the analysis result in such a manner as to be readable, and to be installed on a distribution line structure such as a pole for supporting the high voltage distribution line 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage distribution line which is convenient for tracking and specifying the source of harmonics by measuring the harmonic components of the voltage (voltage between the ground) and the current of the high voltage distribution line. Relates to a harmonic detection device.

[0002]

2. Description of the Related Art If a high voltage distribution line system has a harmonic power source,
This causes various troubles in the equipment connected to the grid. The causes of generating harmonics in the distribution system are:
Some are due to rectifiers, some are due to non-linear load equipment such as arc furnaces, some are due to iron core saturation of transformers, etc., but recently, the influence of semiconductor-based equipment such as thyristors has become remarkable with the development of office automation. Is appearing. If harmonics are present in the power distribution system, not only the abnormal sound of the device but also the electronic device such as the image of the TV being disturbed is adversely affected, and the control device such as the relay malfunctions.

[0003]

Conventionally, it is known to connect a low voltage type harmonic detector such as an oscillograph to the consumer side wiring after the service line from the high voltage distribution line to investigate the harmonic generation source. In general, this has a problem that it is difficult to find the source due to the enormous number of consumers, and it takes a long time and many man-hours for investigation, resulting in high cost. The present invention has been made in order to solve such a problem, and an object of the present invention is to measure harmonics in the middle of a high-voltage distribution line, and to generate them by performing sequential measurements. The aim is to be able to reliably track and identify the position of the source, to rationalize the work for detecting harmonics, and to achieve a stable supply of high-quality power.

[0004]

The present invention has the following constitution in order to achieve the above object. That is, the present invention is a clamp current transformer that detects a phase current of a clamped high-voltage distribution line through a secondary coil wound around an annular iron core that can be opened and closed so as to clamp the high-voltage distribution line. And a voltage detection electrode provided in proximity to the clamp current transformer for electrostatically inductively detecting the phase voltage of the clamped high voltage distribution line, and the detected phase current and phase voltage with the high voltage distribution line. Is a sensor unit that includes a transmitter that converts the signal into an electrically isolated signal for transmission, and a harmonic wave that receives the signal from the transmitter and analyzes each harmonic voltage / current component included in this signal. A high-voltage distribution line harmonic characterized by comprising an analysis part and a storage part for storing the analysis result in a readable manner, and including a device main body part attached to a distribution line construction such as a power pole supporting the high-voltage distribution line. It is a wave detection device.

The present invention also has the above-mentioned structure.
The present invention is characterized in that an insulation operating rod capable of remotely opening and closing the clamp current transformer in an electrically insulating manner from the ground is connected to the sensor unit.

[0006]

According to the present invention, the sensor part itself can be suspended on the high voltage distribution line by opening the annular core of the clamp current transformer, inserting the high voltage distribution line, and then closing it. The current is detected by the current transformer and the voltage is detected by the voltage detecting electrode, and the detected value is transmitted from the sensor section by radio or the like in an electrically insulated manner. The signal transmitted in this manner is received by, for example, a device main unit attached to a nearby utility pole, and at the same time stored in a readable manner as a measurement value corresponding to each harmonic component by a harmonic analysis unit of the device main unit. It

The stored measured values can be printed out as required, or can be taken out as information on an IC card or the like. As a result, it is possible to immediately check whether or not each harmonic component is present on the high-voltage distribution line and the flow direction of each harmonic current, and it is possible to easily trace the harmonic generation source. That is, by moving the sensor part while it is clamped to the high-voltage distribution line,
You can easily reach the source of harmonics. The measurement items include each harmonic voltage content rate (voltage distortion rate), each harmonic current content value, each harmonic voltage based on the fundamental wave, and current phase angle.

Further, by attaching the insulating operation rod to the sensor portion, the sensor portion can be easily suspended from the ground and safely under insulation. By the way, although both harmonic voltage and current exist in common in each high-voltage distribution line, the higher ones are generally the third, fifth, seventh and eleventh order odd harmonics, and the even harmonics are second order harmonics. Is a relatively high level,
The harmonic voltage content rate is set to several percent in an actual measurement example of a general distribution line, and the device of the present invention can reliably and promptly measure each harmonic component and investigate the source.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an electrical configuration of a high-voltage distribution line harmonic detection device according to an embodiment of the present invention, in which (a) shows a sensor unit 1 and (b) shows a device main unit 2. The sensor unit 1 includes a clamp current transformer 3, two voltage detection electrodes 4 arranged in close proximity to each other, a control unit 5, and a communication module 6. The clamp current transformer 3 is a general-purpose ammeter in which a secondary coil is wound around a ring-shaped iron core formed by hinge-bonding a fixed-side iron core and a movable-side iron core so that the iron core can be opened and closed. This clamp current transformer 3 induces a secondary current proportional to the current flowing through the high voltage distribution line 14 in the secondary coil by opening the annular core, inserting the high voltage distribution line 14 and closing the ring.

The two voltage detecting electrodes 4 are placed at appropriate positions so as to be as close as possible to the high voltage distribution line 14 when the clamp current transformer 3 is clamped to the high voltage distribution line 14 and the sensor unit 1 is suspended. Provided with insulation maintained. This voltage detection electrode 4 is the voltage of the high voltage distribution line 14 (voltage to ground).
Is induced electrostatically. At that time, by using the two electrodes, it is possible to use the differential amplifier connected to the electrodes to erase the tuning component and cancel the induction component, thereby improving the voltage detection accuracy.

The control means 5 comprises a current detection system associated with the clamp current transformer 3, a voltage detection system associated with the voltage detection electrode 4, and a control unit. The current detection system is composed of the current amplifier 2
1, a low pass filter 22, and a sample hold A / D conversion circuit 23. The voltage detection system includes a voltage amplifier 24, a low pass filter 25, a sample hold A / D.
It is formed by the D conversion circuit 26, the zero-cross detection circuit 27, and the phase synchronization control circuit 28. The control unit includes a central control unit CPU 29, a memory ROM 30, a memory RAM 31,
It is formed by the electronic clock circuit 32 which can set the sampling time for each of 1, 3, 10, 20, 30, 60. The control means 5 operates as follows. For example,
The current and voltage detected by the clamp current transformer 3 and the voltage detection electrode 4 are sampled every 10 minutes of sampling time.
The signals are converted into digital signals by the A / D conversion circuits 23 and 24, and the signals are temporarily stored in the RAM 31. Then, the voltage data and the current data are read from the RAM 31 and wirelessly transmitted via the communication module 6.
The communication module 6 is composed of a transmission circuit, and wirelessly transmits the input voltage data and current data as wireless signals from the antenna.

The apparatus main body section 2 comprises a communication module 7 and a control means 8 comprising a harmonic analysis section and a data storage section. The communication module 7 is formed in the receiving circuit,
The voltage and current data of the inputted wireless signal are transmitted to the control means 8. The control means 8 includes a central control unit CPU 33, a memory ROM 34, a memory RAM 35, a printer interface 36, an IC card interface 37,
It comprises a keyboard 38 and a liquid crystal display 39.
The control means 8 operates as follows. The voltage data and current data sent from the communication module 7 are temporarily stored in the memory RAM 35. The stored voltage data and current data are read from the RAM 35, and the CPU
Each harmonic component is analyzed at 33, and the analysis result is stored in the RAM 35. The stored analysis results and various voltage value data can be displayed on the liquid crystal display 39 by operating the keyboard 38. Further, the keyboard 38 can be operated to operate the printer interface 36 or the IC.
Printer 40 connected to card interface 37
Alternatively, it can be output to the IC card 41.

FIG. 2 is a schematic perspective view showing an installation mode of the embodiment of the present invention. In the harmonic detection device for a high voltage distribution line having the above electrical configuration, the sensor unit 1 is installed by suspending it on the high voltage distribution line 14 by the clamp operation of the clamp current transformer 3, and the device body 2 is installed on the utility pole 15. It is fixed and used. The sensor unit 1 detects the waveform of voltage and current for one cycle every sampling time, converts the analog value into a digital value, and wirelessly transmits the digital detected value to the apparatus main body unit 2. The apparatus main body 2 analyzes the transmitted digital detection value and internally stores various data such as voltage and each harmonic component, and can read out and record and display at any time.

FIGS. 3 and 4 show the principal part mechanism of the sensor section 1 in a front view and a side view, respectively. Two rods 54, 54 are attached to a horizontal plate portion 52A of a base plate 52 fixing the box 51 in which each part of the control means 5 is housed and the clamp current transformer 3 via a fixing metal fitting 53. The rod 54,
The lower end 54 is fixed to the fixing member 53 by clamping and tightening with two nuts and extends vertically upward.
A sliding member 60 made of an electrically insulating material is spanned and loosely fitted over the two rods 54, 54 so as to be slidable in the vertical direction. , 54
A saddle member 55 made of an electrically insulating material so as to extend across the upper ends of the
Are fixed by sandwiching and tightening with two nuts. This saddle member 55, as shown,
The sliding member 60 approaches the saddle member 55 from below and sandwiches the high-voltage distribution line 14 between the saddle member 55 and the saddle member 55. It is a member for stably holding the sensor unit 1 that is attached and suspended, and for opening and closing the annular core 11 as described later.

An iron core holder 56 is integrally fixed to the upper surface of the saddle member 55, and a cap member 57 is attached to the upper surface. The iron core holder 56 holds the stationary core 12 of the annular core 11. On the other hand, in the central portion of the sliding member 60, the two voltage detection electrodes 4 and 4 are held in the upper position, and the movable side core 13 of the annular core 11 is held in the lower position.

An upper end of a screw rod 58 is rotatably attached to the central portion of the horizontal plate portion 52A and the fixing bracket 53 via a sleeve 59 around the rod shaft. The screw rod 58 hangs in parallel with the rods 54, 54, a movable plate 61 is screwed into a screw portion by a screw hole provided in the central portion thereof, and a lower end portion thereof has a trumpet shape. The rod mounting member 9 is fixed coaxially. Two rods 62, 62 are attached to both ends of the movable plate 61, and the lower ends of the rods 62, 62 are fixed to the movable plate 61 by clamping with two nuts. It extends vertically upward, and the upper end portion is fitted to both end portions of the sliding member 60, and is fixed to the sliding member 60 by sandwiching and tightening using two nuts.

In the sensor unit 1 having the above-mentioned structure, an insulating operating rod 10 having a predetermined length, for example, 2.5 m, is coaxially fixed to the rod mounting member 9. By rotating the insulating operation rod 10 in the clockwise direction, the movable plate 61, the rods 62, 62 and the sliding member 60 move integrally downward in FIGS. The side iron core 13 is lowered, and the annular iron core 11 is opened. The lower end of the insulating operation rod 10 is gripped by the operator and the high-voltage distribution line 14 having a coating is inserted into the annular iron core 11 that is opened to bring it into the suspended state shown in the figure. Next, by rotating the insulating operation rod 10 in the counterclockwise direction, the movable plate 61, the rods 62, 62 and the sliding member 60 are integrally moved upward in FIGS. 3 and 4 and held by the sliding member 60. The movable iron core 13 rises, the annular iron core 11 is closed, and the high-voltage distribution line 14 is sandwiched between the saddle member 55 and the sliding member 60, and the high-voltage distribution line 14 and the sensor unit 1
And are fixed. In this way, the suspending operation of the sensor unit 1 and the clamping operation of the clamp current transformer 3 can be simultaneously and safely performed by the remote operation of the operator standing below the high-voltage distribution line 14.

The above embodiment is an example in which signals are exchanged between the sensor section 1 and the apparatus main body section 2 by a wireless communication system. However, the present invention uses an optical communication system. Of course, the point is that the detected phase current,
It goes without saying that other modified signal transmission / reception schemes can be adopted if the phase voltage can be converted and transmitted to a signal in a safety area electrically insulated from the high voltage of the high voltage distribution line. .

[0019]

As described above, according to the present invention, it is generated in the high voltage distribution line by suspending the sensor part on the high voltage distribution line and attaching the device main body part to the distribution line structure such as a utility pole. It is possible to directly detect the quality, magnitude and flow direction of the harmonics and store that information at any time. Further, the measured values corresponding to the respective higher harmonic components stored in the apparatus main body can be printed out as necessary, or can be taken out as information to an IC card or the like.

As a result, according to the present invention, it is possible to immediately check whether each harmonic component is present on the high-voltage distribution line and in which direction the flow is, and the sensor unit is moved in the middle of the high-voltage distribution line. By doing so, the harmonic generation source can be easily reached, the harmonic generation source can be easily traced and specified, and each harmonic component can be quickly and rationally investigated. Further, according to the present invention, it is possible to safely attach and detach the work from the ground by operating the insulated operating rod, and there is an advantage that it is simple and highly safe.

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of a harmonics detecting device for a high voltage distribution line according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing an installation mode of an embodiment of the present invention.

3 is a front view showing a main part mechanism of a sensor unit 1 shown in FIG. 1. FIG.

4 is a side view showing a main part mechanism of the sensor unit 1 shown in FIG. 1. FIG.

[Explanation of symbols]

1 ... Sensor part, 2 ... Device body part, 3 ... Clamp current transformer,
4 ... Voltage detecting electrodes, 5 ... Control means, 6 ... Communication module, 7 ... Communication module, 8 ... Control means, 9 ... Rod mounting member, 10 ... Insulation operating rod, 11 ... Annular iron core, 12 ... Fixed side iron core, 13 ... Movable iron core, 14 ... High-voltage distribution line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Yamazaki 3 29-3 Obama-cho Amagasaki City Hyogo Prefecture Hasegawa Denki Kogyo Co., Ltd. (72) Takao Omori 3-29 29 Obama-cho Amagasaki City Hyogo Prefecture No. 3 Hasegawa Electric Co., Ltd.

Claims (2)

[Claims] 1. A clamp current transformer that detects a phase current of a clamped high-voltage distribution line through a secondary coil wound around an annular iron core that can be opened and closed so as to clamp the high-voltage distribution line. , A voltage detection electrode that is provided in the vicinity of the clamp current transformer and electrostatically inductively detects the phase voltage of the clamped high-voltage distribution line, and the detected phase current and phase voltage with the high-voltage distribution line. Harmonic analysis that includes a sensor unit that includes a transmitter that converts the signal into an electrically isolated signal and transmits the signal, and a harmonic analysis that receives a signal from the transmitter and analyzes each harmonic voltage / current component included in the signal Section and a storage section for storing the analysis result in a readable manner, and a device main body section attached to a distribution line construction such as a utility pole supporting the high voltage distribution line. Detection device. 2. The harmonic detecting device for a high-voltage distribution line according to claim 1, wherein an insulation operating rod capable of remotely opening and closing the clamp current transformer from the ground in an electrically insulating manner is connected to the sensor unit.