JPH08278215A - Automatic tension monitor of overhead wire - Google Patents

Abstract

PURPOSE: To obtain an automatic tension monitor by which the measuring error of tension is reduced and also the abnormal current of a transmission line and the passage of an electric train are detected, thus specifying the time required for measuring a dynamic characteristic such as tension or the like. CONSTITUTION: An automatic tension monitoring apparatus is provided with a tension sensor 105 which is instaled at the fixation end of an overhead wire or at least in one place near it and with a signal processor for the tension sensor 105. The automatic tension monitoring apparatus is provided with a first-stage signal processing circuit 106 which amplifies and processes the output signal of the tension sensor 105, with a noise compensation circuit 107 which detects a signal change generated by a leakage current flowing to the tension sensor 105 by receiving the output of the first-state signal processing circuit 106 and which outputs a tension signal compensating the signal change, with a signal control circuit 109 which adjusts the output level of the noise compensation circuit 107 and with a monitoring and measuring device 112 which monitors and measures the output signal of the signal control circuit 109. In addition, the automatic tension monitoring apparatus is provided with a transmitter 110 which transmits the output of the signal control circuit 109 to the monitoring and measuring device 112 and with a receiver 111.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead wire tension monitoring device using a magnetostrictive tension sensor.

[0002]

2. Description of the Related Art Conventionally, tension control of overhead wires such as distribution lines has been performed by a tension sensor installed on the support side of the overhead wire via an insulator. A tension adjusting device for an electric train line such as a Shinkansen is as shown in the schematic diagram of FIG.
That is, the overhead wire is composed of a catenary wire 501, an auxiliary catenary wire 502, and a trolley wire 503. The trolley wire 503 is connected to the weight 507 through the wire turnbuckle 504 for adjusting the tension, the yoke 505 and the insulator 506 at both ends in units of about 1500 m, and applies the tension to the trolley wire 503 by the weight of the weight 507. Has become. By the way, unless the tension of the trolley wire is kept constant, the contact between the pantograft of the train and the trolley wire becomes poor, and the pantograph separates from the trolley wire (disconnection). As a result, an arc occurs, abnormal wear of the trolley wire occurs, and the wire may be broken. Therefore, it is necessary to constantly monitor the tension of the trolley wire, but as a method of monitoring the change in the tension of the trolley wire, the inclination of the yoke 505 caused by the imbalance of the tension applied to each overhead wire can be visually inspected, or the wire can be inspected. A tension sensor 508 is inserted into the turnbuckle 504 to measure the tension of each part of the overhead wire.

[0003]

However, in the conventional tension sensor used for overhead wires such as distribution lines, when a leakage current flows through the tension sensor due to deterioration of the insulator or the like, the tension sensor outputs a detection signal. Signal fluctuations (noise) may occur, causing an error in tension measurement. In addition, for train lines such as bullet trains, the method of visually inspecting the inclination of the yoke and estimating the tension is not accurate, and is about 1500 m.
There is a problem that it takes a lot of manpower to check the yokes arranged at intervals. Also, the method of inserting the tension sensor into the turnbuckle and measuring the tension of each overhead wire is
A circulating current may flow through the tension sensor, causing signal fluctuation (noise) in the detection signal of the tension sensor, which may cause an error in the tension measurement value. Also, it is good to always measure under the same measurement conditions (measurement accuracy, resolution, etc.), but for example, when trying to measure the dynamic characteristics of an overhead line when passing a train, this tension change is at most about 10 to 30 kg, Since it is very small, there is a problem that the measurement accuracy at the time of constant tension monitoring is insufficient. Furthermore, in order to extract the dynamic characteristic data when the train is passing from the data of constant tension monitoring, it is necessary to extract necessary data from the enormous amount of recorded tension data, and it takes a lot of time. There were problems, such as large power consumption. An object of the present invention is to reduce an error in tension measurement and detect an abnormality in each electric wire such as deterioration of an insulator. Further, when the tension sensor is used for an electric train line, it is possible to provide an automatic tension monitoring device for an overhead wire which can detect the time when the electric train is passing and specify the time required to measure the dynamic characteristics such as tension. It is intended.

[0004]

In order to solve the above-mentioned problems, the present invention comprises a tension sensor provided at least at a fixed end of an overhead wire or in the vicinity thereof, and a signal processing device for the tension sensor. In an automatic tension monitoring device for overhead wires, a first stage signal processing circuit that amplifies the output signal of the tension sensor, and a signal fluctuation caused by a leakage current or an abnormal current flowing in the tension sensor upon receiving the output of the first stage signal processing circuit. A noise compensating circuit that detects a signal and outputs a tension signal that compensates for the signal fluctuation, a signal control circuit that adjusts the output level of the noise compensating circuit, and a monitor / measurement that monitors / measures the output signal of the signal control circuit. It is also provided with a device and a transmitter and a receiver for transmitting the output of the signal control circuit to the monitor / measurement device. Further, it is provided with a trigger signal generation circuit which detects the rising and falling of the signal fluctuation and outputs the detection signal to the signal control circuit. Further, the overhead electric wire is an electric line, and detects an approaching electric train that is powered by the electric line from the rise of the signal fluctuation,
The end of passage of the train is detected from the trailing edge of the signal fluctuation.

[0005]

With the above means, the output signal of the first-stage signal processing circuit for processing the output signal of the tension sensor is input to the noise compensating circuit, so that in the tension sensor of the transmission and distribution line, leakage current or Signal fluctuations due to abnormal current can be detected. In addition, in a tension sensor for a train line such as a Shinkansen, a signal fluctuation due to a circulating current flowing through the tension sensor when a train is passing is detected and a signal with the signal fluctuation eliminated is output. You can get a signal. In addition, the trigger signal generation circuit detects the rise of the signal fluctuation due to the circulating current detected by the noise compensation circuit, the approach of the train is detected, and the passage of the train is detected by the fall of the signal fluctuation. It is possible to measure dynamic characteristics such as tension measurement only when passing a train.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment in which the tension sensor of the present invention is used in a train line. In the figure, 101
Is a first yoke, which is connected to the column 11 via the insulator 12 and can be tensioned by the weight 13. Reference numeral 101 'is a second yoke connected to the first yoke, 102 is an overhead wire connected to the first yoke 101, 103 is an auxiliary overhead wire connected to the second yoke 101', and 104 is a trolley wire. Then, the magnetostrictive tension sensor 1
05 is installed at a fixed end of any of the trolley wire 104, the auxiliary catenary wire 103, and the catenary wire 102. 106
Is a first-stage signal processing circuit that amplifies the output of the tension sensor 105, 107 is a noise compensation circuit, 108 is a trigger signal generation circuit, 109 is a signal control circuit that performs signal selection, signal gain adjustment, and trigger signal generation, and 110 is Transmitter, 11
One receiver and 112 are various monitor / measurement devices. Figure 2
Is the head portion of the tension sensor 105 and the first stage signal processing circuit 106, the noise compensation circuit 107, the trigger signal generation circuit 1
It is a block diagram of 08. 51 is an exciting coil of the tension sensor 105, 52 is a trolley wire 104, a catenary wire 102,
A sensor shaft is provided at any fixed end of the auxiliary catenary 103, 53 is a magnetostrictive film provided on the sensor shaft 52, 54 and 55 are detection coils, 56 is a power amplifier, and 57 is an oscillator. 61 and 62 are first-stage amplifiers, 6
Reference numerals 3 and 64 are full-wave rectification circuits, and 65 is a differential amplifier, which form the first-stage amplification / signal processing circuit 106. 71 is a notch filter of the noise compensation circuit 107, 7
2 is a differential amplifier, 73 is a low pass filter, 74 is a band pass filter (or AC coupling device), 75
Is a full-wave rectification circuit, 76 is a zero adjustment circuit, and 77 is a gain adjustment circuit. Reference numeral 81 is a comparator of the trigger signal generation circuit 108, and 82 is a variable resistor for adjusting the level of the comparator 81.

As a first embodiment, a case where the tension of the trolley wire 104 is constantly monitored will be described. Tension sensor 1
The signal from 05 is converted into a tension signal V _T having a voltage proportional to the change in tension by the first-stage signal processing circuit 106, as shown in FIG. Normally, no current flows in the sensor shaft 52 of the tension sensor 105 connected to the trolley wire 104. However, the train approaches and the tension sensor 105
A current called a circulating current flows through the sensor shaft 52 until it finishes passing through the trolley wire 104 attached with. When a current flows through the sensor shaft 52, as shown in FIG. 3B, a signal fluctuation component V _N having a frequency twice the current frequency is generated, which causes an error in the detection signal. This signal fluctuation component V _N
Are removed by the noise compensation circuit 107. That is, when a current flows through the sensor shaft 52, the tension signal V is output to the output of the differential amplifier 65 as shown in FIG.
_T is twice the frequency (120H) of the current frequency (60Hz)
The signal fluctuation component V _N of z) appears in superposition. This signal is passed through a notch filter 71, and the signal (V _T + V
_N / 2) is obtained. At the same time, the output of the differential amplifier 65 is passed through a bandpass filter (or an AC coupling device) 74, so that the signal fluctuation V as shown in FIG.
_{Get N.} By full-wave rectifying this signal by the full-wave rectifying circuit 75, the signal (V _N / π) of FIG. 3E is obtained. This signal is gain adjusted by the gain adjustment circuit 76 (gain π /
2) and obtain the signal (V _N / 2). Gain adjustment circuit 76
And the output of the notch filter 71 are input to the differential amplifier 72, and the signal (V _T + V _N / 2) to the signal (V _N / 2)
Is subtracted, a tension signal V _T having no signal fluctuation due to the circulating current as shown in FIG. 3 (f) is obtained. This signal is transmitted from the extra high voltage side to the receiver 111 on the ground side by light or an optical fiber by the transmitter 110 shown in FIG. 1, and recorded / measured by the monitor / measurement device 112.

As a second embodiment, a method of measuring the dynamic characteristics (transient tension fluctuation, etc.) of an overhead line only when passing a train will be described. To measure only when passing a train, you need to know the approach of the train. The signal fluctuation due to the circulating current is used as a method of knowing the approach of a train. That is, when a train approaches, a circulating current flows through the sensor shaft 52, a signal fluctuation component V _N of 120 Hz is superimposed on the tension signal V _T, and a signal having a waveform as shown in FIG. Is output. Only the signal fluctuation component V _N is extracted by the bandpass filter (or AC coupling device) 74 to obtain a waveform as shown in FIG. This signal is full-wave rectified by the full-wave rectifier circuit 75 to obtain a signal as shown in FIG. This signal is output by the comparator 81
Obtaining a trigger signal V _k in the high level (or low level), as shown in FIG. 4 (d) is compared with a reference voltage V _{re f.}
When the train finishes passing, the circulating current disappears, so that the train proximity trigger signal V _k becomes low level (or high level).

In the signal control circuit 109, the trigger signal V _K
Is input, the rising edge of this signal is detected, and a timer that can freely set the time
A trigger signal is generated after a predetermined time. This trigger signal turns on the power of the transmitter 110, and at the same time,
The transmitter 110 sends the measurement start signal and the tension signal to the receiver 111 on the ground side, starts the monitor / measurement device 112, and monitors, records, and measures the tension signal. In addition, the signal fluctuation at this time is very small (20 kg or more) compared to the tension fluctuation value (100 kgf or more) throughout the day or year.
Since it is less than or equal to kgf), the signal control circuit 109 increases the signal gain to increase the output sensitivity and output the tension signal.
When the signal control circuit 109 detects the fall of the trigger signal V _K , similarly, after the train has passed through the timer, a measurement end signal is sent to the monitor / measurement device 112 at a predetermined time to end the measurement and the transmitter power is turned off. To do.

As a third embodiment, a case will be described in which constant tension monitoring and dynamic characteristic measurement at the time of passing a train are simultaneously performed. When the train is not running, that is, when the trigger signal is at the low level, the tension data is recorded / measured by the monitor / measurement device 112 as in the case of the first embodiment.
When a train approaches and the trigger signal goes high,
As in the case of the second embodiment, the measurement start and end triggers are generated, the output sensitivity is increased, the tension signal is output, and the measurement and recording are performed. At this time, the signal control circuit 109 may switch the constantly monitored tension signal to the dynamic characteristic tension signal and measure / record with one measuring device or one channel of the monitor / measurement device 112. The signal and the dynamic characteristic tension signal may be measured and recorded in parallel by a plurality of measuring devices or multiple channels.

[0011]

As described above, according to the present invention, the tension of the overhead wire can be automatically monitored and measured without manpower. In addition, the signal fluctuation (noise) due to the circulating current can be compensated for, and at the same time, the approach of the train can be detected without using other sensors, and the signal can be used to arbitrarily change the data measurement time or the measurement range to achieve high accuracy, Can measure with high sensitivity. Furthermore, if you want to measure only the dynamic characteristics when passing a train,
By measuring only when passing a train, there are effects that power consumption can be reduced and recording memos, chart paper, etc. can be saved and reduced. Also, regarding tension of overhead lines such as power lines,
The same effect is obtained in measurement.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a tension sensor, a first stage signal processing circuit, a noise compensation circuit, and a trigger signal generation circuit according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing operation waveforms of the noise compensation circuit according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing operation waveforms of the trigger signal generation circuit according to the embodiment of the present invention.

FIG. 5 is a schematic diagram of a trolley wire.

[Explanation of symbols]

104 trolley wire, 105 tension sensor, 106 first stage signal processing circuit, 107 noise compensation circuit, 108 trigger signal generation circuit, 109 signal control circuit, 110 transmitter, 111 receiver, 112 monitor / measurement device

Claims (3)

[Claims] 1. An automatic tension monitoring device for an overhead wire, comprising: a tension sensor provided at at least one position at or near the fixed end of the overhead wire; and a signal processing device for the tension sensor. A first-stage signal processing circuit that amplifies a signal, and a signal fluctuation that is generated by a leakage current or an abnormal current flowing through the tension sensor in response to the output of the first-stage signal processing circuit is detected and a tension signal that compensates the signal fluctuation is output. A noise compensation circuit, a signal control circuit for adjusting the output level of the noise compensation circuit, a monitor / measuring device for monitoring / measuring the output signal of the signal control circuit, and an output of the signal control circuit for the monitor / measuring device. An apparatus for automatically monitoring the tension of an overhead wire, comprising: 2. The automatic tension monitoring device for an overhead wire according to claim 1, further comprising a trigger signal generation circuit that detects a rising edge and a falling edge of the signal fluctuation and outputs the detection signal to the signal control circuit. 3. The overhead wire is a train line, the approach of a train that is powered by the train line is detected from the rise of the signal fluctuation, and the passage end of the train is detected from the fall of the signal fluctuation. The automatic tension monitoring device for an overhead wire according to claim 1 or 2.