JPS5919313B2 - Trolley wire switching comprehensive time measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a trolley wire switching system for measuring the time from the time of the switching signal given by the track circuit for switching the trolley wire to the end of the switching in a segmented section of the trolley wire of an AC electrified section. This invention relates to a time measuring device.

In AC electrified sections, when supplying power to the trolley wire (hereinafter referred to as feeding power), in order to avoid dangers due to differences in voltage phase between adjacent substations, the trolley wire is divided into sections of fixed length for each specified section. The power supply from one substation is switched to the power supply from the other substation only when a train enters this section. The trolley wire in the division section becomes momentarily unpressurized.

In order to carry out such a changeover, a track circuit is provided for this purpose a distance in front of the track determined by the dividing section, and when the train enters the track circuit, the track circuit entry signal is changed. , this is applied as a switching signal to a trolley wire changeover switch provided on the ground, and a switching operation is performed.

The time from when such a switching signal is given to when the trolley wire switching ends is called the total trolley wire switching time, and this value is compared to a predetermined value (design value of approximately 2 seconds). It is necessary to constantly measure the presence or absence of abnormalities in the switch system and confirm whether the changeover switch system is operating properly.

This measurement is also carried out on the ground, but on the Shinkansen, it is carried out on board an electric test vehicle for unified measurement and management of all line sections.

In on-board measurements, the above-mentioned track circuit approach signal cannot be used directly, so a receiving coil based on the principle of electromagnetic coupling method is installed on the train using the current of the track circuit, and this captures the track circuit approach signal and generates a switching signal. used for

However, a large number of track circuits are used for various purposes throughout the line section, and on the other hand, the above-mentioned receiving coil is shared by all, and all of the many track circuit approach signals are received. A multi-frequency system with different frequencies is used, and the input signal to the receiving coil is designed to identify and extract only the track circuit entry signal based on the frequency.

A conventional apparatus for measuring the total trolley wire switching time using the above-mentioned track circuit entry signal as a trolley wire switching signal will be outlined below.

FIG. 1 is a block diagram showing a conventional trolley wire switching integrated time measuring device, in which 1 and 1' indicate receiving coils for measuring upstream and downstream directions, respectively.

2.2' is a preamplifier, and 3 is a selector switch for up and down directions.

Reference numeral 4 denotes a bandpass filter which selects only frequencies mutual to the switching signal of the trolley wire from among the various signal frequencies mentioned above.

Currently, 2 to 3 different frequencies are used for the switching signal in the up and down directions, for a total of 4 to 6 waves.

Although not shown in FIG. 1, a necessary number of bandpass filters for frequencies other than those for the trolley wire switching signal are naturally connected in parallel with the above-mentioned bandpass filter 4.

5 is an amplifier for level setting, and 6 is a pulse conversion circuit.

Note that in a multi-frequency signal system such as the above, bandpass filters 4, amplifiers 5, pulse conversion circuits 6, and the like are required as many as the number of frequencies.

Reference numeral 7 denotes a time width measurement circuit, and a built-in counter starts operating in response to each pulse from the plurality of pulse conversion circuits 6 described above.

8 is a stop signal input terminal provided in the time width measuring circuit T, and from the trolley wire non-pressure time measuring device shown in 10,
By supplying a stop signal at the end of switching,
The operation of the counter in the time width measuring circuit 7 is stopped, and measured data is outputted to the display circuit 9 by a register or the like.

In the conventional device described above, circuits such as the bandpass filter 4,
Since a large number of elements are required, the cost not only increases (but also the circuit configuration becomes complicated), which has the drawback of frequently causing failures, especially malfunctions due to strong noise inside the vehicle.

Furthermore, the above-mentioned stop signal is given by the trolley wire non-pressure time measuring device 10, but the stability and reliability of this device is the most important, and if this reliability is lacking, this trolley wire switching comprehensive time measuring device reliability decreases at the same time.

Nowadays, real-time data processing is carried out by computers on electric test vehicles, and in this case the measured data must be particularly reliable.

Conventional devices for these purposes have the disadvantage of lacking certainty and reliability.

The object of the present invention is to eliminate the above-mentioned drawbacks, simplify the device, obtain highly reliable measurement data, and provide a comprehensive trolley wire switching time measuring device that is capable of real-time data processing by a computer. It is something to do.

However, to outline the main parts of the present invention, a separate patent application filed by the same applicant regarding a trolley wire switching time measuring device (patent application filed on
No. and patent application filed on month and day of the Showa era.
The circuit is simplified based on the premise that the highly reliable stop signal shown in No. 1) is used.

In other words, while eliminating the conventionally required bandpass filter that selects only the switching signal from among the various track circuit approach signals, this allows the track circuit approach signals for various track circuits to be taken into the measurement circuit indiscriminately, so to speak. , the measuring counter is operated, and the reliable stop signal, which can be output only when a train is present in the switching section, is used to stop the counter at this point, and only at this time, the time is determined. Output data from the measurement circuit.

Also, if a stop signal is not given, it is assumed that the signal is an unintended track circuit entry signal, and the counter stops after running for a certain period of time, and the data is cleared and there is no output at this time. It is configured.

Next, details of the configuration of the present invention will be explained. FIG. 2 is an outline of a block system showing an embodiment of the present invention.
, 1', preamplifier 2°2', and up/down selector switch 3 have the same structure as the conventional device.

All of the track circuit entry signals received by the receiving coils 1, 1' are directly input to the pulse conversion circuit 6, regardless of the frequency depending on the type of track circuit.

However, the presence or absence of attenuation caused by the branching of the track circuit entry signal other than the trolley wire switching signal as described above does not interfere with the intended function of this device, as will be described below.

The pulse conversion circuit 6 generates a pulse of a predetermined width at the time of input of the track circuit entry signal, and the counter built in the time width measurement circuit 7' starts operating by this pulse.

Therefore, the operation of the counter is started not only by the track circuit entry signal corresponding to the switching signal but also by other track circuit entry signals.

Next, a stop signal is generated in the division/section discrimination circuit 12 at the end of switching, and the stop signal is sent to the stop signal input terminal 8.
is given, at which point the counter stops operating,
Output that data.

This output is immediately displayed on the display circuit 9, and is also input to a data processing device 11, where it is subjected to various calculations such as comparison with previous values, determination of abnormal values, and statistical processing.

In the above, if a stop signal is not input within a certain period of time after the counter in the time width measurement circuit γ starts operating, the counter runs by itself during that period, stops by itself after a certain period of time, and clears the data. If the data is invalid, it will not be output.

Because of this system, the stop signal used in this device is limited to one that occurs at the end of switching in the trolley wire division section, and its reliability is important.

Note that the length of the above-mentioned fixed time can be arbitrarily determined, but in Shinkansen, the total trolley wire switching time is usually about 2 seconds, but in extremely exceptional cases it can be about 8 seconds. A value of 2 seconds or 8 seconds or more is set as 10 seconds.

On the other hand, the distance between adjacent segment sections is long enough that the time it takes for a train to travel from one segment section to the next is much longer than 10 seconds (which may lead to overlapping measurements and false measurements). It is impossible to invite.

Next, we will discuss how to obtain a stop signal.

In short, the section discriminating circuit 12 needs to be able to output a reliable stop signal, and for this purpose, a part of the trolley wire switching time measuring device of the above-mentioned patent application can be used in common.

Such common use is also effective for simplifying the circuit.

The outline will be explained below.

As mentioned above, when a train enters a section and the changeover switch operates, the trolley wire of the section becomes unpressurized for an instant, but during this time the main motor or auxiliary motor of the vehicle continues to rotate. A back electromotive force is generated.

As a result, a voltage of the same phase as before switching is applied to the pantograph system, and a current of the opposite phase flows through some circuits of the pantograph system.

The voltage and current in such a phase state continue during the non-pressurizing time and are restored upon completion of switching.

The above patent application attempts to measure the no-pressure time by utilizing the fact that the phase of the current is reversed during the no-pressure time, but in order to further increase the stability and reliability of the measurement, A method is adopted in which it is confirmed whether the switching section is present or not by verifying the phase reversal of the current within a certain time width during the pressurizing time, and whether the data is valid or invalid is determined.

This will be explained below using figures.

Figure 3 shows one of the aforementioned patent applications (Showa
FIG. 4 is a block diagram showing the main parts of an embodiment of the contact wire switching non-pressurized time measuring device disclosed in Japanese Patent Application No. 1999/1999, and FIG. 4 is a time chart corresponding to FIG. 3.

In FIG. 3, reference numeral 13 represents a pantograph system, and a voltage transformer 14 and a current transformer 15 connected thereto change the voltage and current, respectively.

In FIG. 4, a waveform a indicates a voltage waveform or a current, and the switching non-pressurizing time is between (tll-t2/).

16 and 17 in Figure 3 are both low-pass filters,
A circuit network consisting of circuits, bandpass filters, etc., which provides the voltage and current waveforms with the required multiplication waves.

Waveforms C and d in FIG. 4 show the second harmonic of the obtained voltage and current, respectively.

Reference numerals 18 and 19 are waveform shaping circuits, by which the second harmonics of voltage and current are both rectangularized to form waveforms e and f in FIG. 4.

20 is a phase detection circuit which operates when the phases of waveform e and waveform f are inverted and generates an inversion pulse at the end of each rectangular wave.

This is shown in waveform g in FIG.

If the switch becomes non-pressurized at the time tll shown in Fig. 4,
The phase detection circuit 20 gives the first inverted pulse t1 as a switching start pulse to the start pulse circuit 21, and at this point, the start pulse is sent from the start pulse circuit 21 to the time width measurement circuit 23, and is stored in the time width measurement circuit 23. The current counter starts operating.

Then, when the switching is completed at time t21 shown in FIG. 4, the phase detection circuit 20 applies the last inversion pulse t2 to the stop pulse circuit 22, stops the counter by the stop pulse output from the stop pulse circuit 22, and then outputs the data. is output to the display circuit shown at 24.

25 is a voltage amplitude change detection circuit, and the pantograph system 13
By detecting the change in the amplitude of the voltage and obtaining the start and end signals of the switching no-pressure time, it is possible to measure the no-pressure time in the same way as the current phase detection method described above. When used in conjunction with the phase detection method, it is possible to start switching (start pulse) and end switching (stop pulse) using either of these signals, without losing measurement of the switching non-pressure time.

Although such a method can sufficiently prevent measurement omissions, it increases the chance of erroneous errors due to track separation phenomena and noise existing in the vehicle.

On the other hand, the valid/invalid determination circuit shown at 26 in FIG. 3 plays an important role.

The inverted pulse g obtained by the phase detection circuit 20 is given to a valid/invalid discrimination circuit 26, while the time width measuring circuit 2
3, a counter circuit is used to generate a discrimination signal with an appropriately determined time width, and this is sent to the valid/invalid discrimination circuit 26.
give to

The discrimination signal is shown in the fourth diagram. On the condition that a predetermined number of inverted pulses exist during the time of the discrimination signal (as shown in waveform g in Fig. 4), when the pulse exists, the valid/invalid discrimination circuit 26 detects the valid signal from the time width measuring circuit. 23, the counter continues its operation and is stopped by the stop pulse, as described above.

If there is no inverted pulse during the above-mentioned time, the valid/invalid determination circuit 26 sends an invalid signal to the time width measuring circuit 23, the counter stops operating, the data is cleared, and no data is output. do not have.

In this case, the time width (t3-t4) of the discrimination signal is
It can be determined appropriately taking into account the noise phenomenon, etc., and the measurement of the switching non-pressure time can be changed with extremely high reliability.

By using a part of the above-described trolley wire switching time measuring device, the section determining circuit 12 of the present invention can be easily configured.

For example, if the time width measurement circuit 23 is configured to extract only the stop pulse for valid data, this pulse can be used as it is as the stop signal of the present invention.

In this case, as mentioned earlier, part of the trolley wire switching time measuring device will be used in common.

As described above, according to the present invention, all bandpass filters, amplifiers, etc. used in conventional trolley wire switching integrated time measuring devices are not required, and the number of pulse conversion circuits can be reduced. The configuration is greatly simplified,
This not only reduces costs, but also reduces failures, prevents malfunctions due to disconnection phenomena and noise, enables stable and reliable measurements, and enables smooth real-time processing by computer with reliable measurement data. This has advantages such as being able to provide a device.

[Brief explanation of drawings]

Fig. 1 is a block system diagram of a conventional trolley wire switching integrated time measuring device, Fig. 2 is a block system diagram showing an embodiment of the device according to the present invention, and Fig. 3 is a trolley wire switching time according to a separate patent application. Block diagram showing the main parts of the measuring device, No. 4
The figure is a time chart for FIG. 1.1'...Receive coil, 2,2'...
・Preamplifier, total...up/down selector switch, 4
... Bandpass filter, 5 ... Amplifier, 6
...Pulse conversion circuit, 7゜7'...Time width measurement circuit, 8...Stop signal input terminal,
9...Display circuit, 10...Trolley wire non-pressure time measuring device, 11...Data processing device, 12...Division section discrimination circuit, 13・・・
... Pantograph system, 14 ... Voltage transformer, 15 ... Current transformer, 16, 17 ...
...Circuit network, 18, 19...Waveform shaping circuit, 2
0... Phase detection circuit, 21... Start pulse circuit, 22... Stop pulse circuit,
23... Time width measurement circuit, 24... Display circuit, 25... Voltage amplitude change detection circuit, 26
...Validity/invalidity determination circuit.

Claims (1)

[Claims] 1. A receiving coil for the track circuit, a pulse conversion circuit that generates a pulse by inputting the received track circuit entry signal to the receiving coil, and a time width in which a built-in counter starts operating when the pulse is input. A voltage transformer for the measurement circuit and trolley wire voltage, a current transformer for the current of the main motor circuit of the electrical inspection vehicle, and a phase detection circuit that detects the phase difference between the output voltage of the voltage transformer and the output current of the current transformer. and a trolley wire division section discriminating circuit that outputs a stop signal at the end of switching in the division section of the trolley wire, and inputting the stop signal to the time width measuring circuit during counting operation. The operation of the counter can be stopped and the measurement data of the time width measurement circuit, that is, the measurement value of the total trolley wire switching time can be output and displayed.
If the stop signal is not input to the time width measuring circuit within a certain period of time, the counter is reset and no measurement data is output from the time width measuring circuit.