JPH0565393B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting inter-rail insulation resistance between first and second rail sections through which asynchronous signal currents flow.

[Conventional technology]

Power supply to electric vehicles on railway electrified sections is as follows:
Normally, this is done by receiving power from a commercial power source and transforming it, but since power is generally supplied between each power company, the power supplies from each power company have the same voltage and synchronized frequency, and each power source has the same voltage and frequency. Even when separate power supply sections that are supplied with power from a power company are adjacent to each other, there is no particular problem in driving the electric vehicle.

Meanwhile, ATC for vehicles in electrified sections
(Automatic Train Control) signals use a carrier wave that is synchronized with the frequency of the train current in order to avoid the influence of the train current flowing from the electric vehicle to the track, and this signal current is passed to the track section to control the vehicle. However, if the power supply frequencies from each power company are synchronized with each other, the train current based on this frequency will be passed, and a signal current that is also synchronized with the power supply frequency will be passed, and each individual power supply section and If the track sections are adjacent and the rails of both track sections are insulated, the insulation resistance value of the insulating material will decrease and there will be no particular problem even if signal current leaks between both track sections. It's summery.

[Problem that the invention seeks to solve]

However, for example, in the case of the Seikan Tunnel, etc., power companies in the Tohoku and Hokkaido regions do not supply electricity to each other and are out of sync with each other, and the track sections on both the Tohoku and Hokkaido sides are adjacent to each other. At this point, the rails of both track sections are naturally insulated from each other, and the power supply sources for both track sections are asynchronous to each other even though they have almost the same frequency, and the signal current based on this is transmitted individually to both track sections. Therefore, if the signal currents leak to each other due to a decrease in the insulation resistance of the insulating material, the ATC in the vehicle
This may affect the reception status of signals, etc., and may lead to erroneous control in a dangerous direction.

In other words, if the power supply frequency in both sections is 50Hz, and the 19th, 20th, and 21st harmonic frequencies of 50Hz are used in both sections as carrier waves of 950Hz, 1000Hz, and 1050Hz, respectively, If the frequency of one power supply drops to 49.5Hz, its 20th harmonic frequency will be 990Hz, and if this leaks to the other, there is a risk that it will be received as a 950Hz signal.

Therefore, there has been a demand for a device that automatically detects the inter-rail insulation resistance value at a location where both track sections are adjacent to each other under such conditions.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

That is, a signal having a detection signal f _s is supplied to both sides of the rails insulated by the insulating materials RI ₁ and RI ₂ , and the detection signal component flowing through the rail and the detection signal generated between adjacent rails are The device is equipped with means for detecting the insulation resistance of the insulating material based on the ratio with the components.

[Effect]

Therefore, by the first to fourth impedance circuits, both rails of both track sections are connected in parallel to the detection signal by a certain distance, and
The detection signal is applied through the insulating material of these and adjacent parts, and if the insulation resistance value of the insulating material is high, the current based on the detection signal will hardly pass through this part and it will be in an open state, and this part will be in an open state. While the detection signal voltage V _x increases, the current sent out from the detection signal generator becomes extremely small, and the voltage V _y resulting from this detection is low and V _y /V _x becomes small. When the resistance value decreases, this relationship is reversed and V _y /V _x becomes large, so the insulation resistance value can be detected based on this ratio.

〔Example〕

The details of the present invention will be explained below with reference to block diagrams showing embodiments.

In the same figure, a first track section T 1 with rails R ₁ and R ₂ and _a second track section T 1 with rails R ₃ and R ₄ are shown.
T ₂ are adjacent to each other, and both rails R ₁ and R ₃ of both sections T ₁ and T ₂
and R ₂ , R ₄ are insulating materials RI ₁ ,
They are insulated from each other by RI ₂ , and in section T ₁ , a signal current that is synchronized with the frequency of the train current passing therethrough is passed, and the same is true in section T ₂ .
The train current frequencies in both sections T ₁ and T ₂ are in an asynchronous state. For example, in section T ₁ and in section T ₂ , a train current that is almost the same as the train current frequency in section T ₁ and in an asynchronous state is passed, A signal current synchronized with this is connected to the same section _T2 .

Therefore, if the insulation resistance value of the insulating materials RI ₁ and RI ₂ decreases and signal current leaks between sections T ₁ and T ₂ , an error will occur in the signal current reception status on the vehicle side as described above. Insulating material RI ₁ , RI ₂
The following circuits are provided for the purpose of automatically detecting insulation deterioration.

In other words, a detection frequency f _s that is different from the frequency of the signal current passing through both sections T ₁ and T ₂ is selected so that it does not affect the reception of the signal current, and
For example, first to fourth impedance circuits Z 1 to ₄ that pass only the same frequency f _s using a series resonant circuit
Z ₄ is prepared, and impedance circuits Z ₁ and Z ₂ are respectively connected and installed between both rails R ₁ and R ₂ and between R ₃ and R ₄ near the adjacent parts of both sections T ₁ and T ₂ respectively. and equal distances from each impedance circuit Z ₁ and Z ₂ in the opposite direction to the adjacent parts, each at a certain distance or more.
Impedance circuits Z 3 and Z ₄ are connected and provided between both rails R ₁ and R ₂ and between R ₃ and R ₄ to each part of both sections T _{1 and} T ₂ separated by l _n , and each impedance circuit Z A detection signal generator that generates a detection signal of frequency f _s between each part of the connected rails R ₂ and R ₄ of Z ₃ and Z ₄ via an impedance circuit Z ₅ equivalent to the impedance circuits _{Z 1} to Z 4. The output of the OSC is connected, thereby applying a detection signal between the connection parts of the impedance circuits Z ₃ and Z ₄ .

In this case, each rail R ₁ to _{R 4} within the distance l _n
The impedance that each impedance exhibits with respect to frequency f _s and the impedance that each impedance circuit Z ₁ to _{Z 4} similarly exhibit are determined to be equal to each other.

In addition, a coil PC for detecting the detection signal current is attached to the rail R ₂ within the distance l _n , and a termination resistor R _L is connected to this, and the terminal voltage of this is connected to the rail R ₂
It is taken out as a voltage V _y corresponding to the detection signal current I _c passing through the circuit and applied to the input Y of the divider D.

However, in this case, each impedance circuit Z ₁ ~
Each rail with the same electrical characteristics of Z ₄ and distance l _n
Since the impedances at the frequency f _s exhibited by R ₁ to _{R 4} are also equal to each other, unless there is a particular abnormality,
The detection signal current I _c detected by the coil PC is approximately 1/2 of the current I _p sent from the signal generator OSC, and this current I _c is detected as a voltage V _y by the coil PC and resistor R _L. Insulating material
The detection signal current leaking between both sections T ₁ and T ₂ via RI ₁ and RI ₂ can be determined.

In addition, each rail R ₁ , R ₂ and R ₃ , R ₄ within the distance l _n is
Both ends of each are connected in parallel by impedance circuits Z ₁ to _{Z 4} , and the impedance circuits Z ₃ and Z ₄ prevent the detection signal current from flowing outward from these and pass to the adjacent parts, so the insulating materials RI ₁ , If any of the RI ₂ deteriorates, the sense signal current passing through it will increase.

On the other hand, the impedance circuit Z ₁ near the adjacent part,
The impedance circuit Z ₁ ~ is connected to the part where Z ₂ is connected.
Through an impedance circuit Z ₆ equivalent to Z ₄ , the frequency
A signal receiver RV of f _s is connected, and this receives the voltage V _x of the detection signal generated between both sections T ₁ and T ₂ via the adjacent part, and if this is above the specified value, the internal The alarm relay is operating, but if the insulation in either of the insulating materials RI ₁ and RI ₂ deteriorates, this part approaches a conductive state and the voltage V _x decreases, so the relay returns to normal and issues an alarm. At the same time, this _voltage V _x is applied to the input X of the divider D, and _{the voltage V y and} V _{x are} A voltage V _p representing a value obtained by multiplying the ratio by a constant K is obtained, and the recorder R _e is driven by this voltage V _p .

Therefore, if the insulation materials RI ₁ and RI ₂ are normal,
The detection signal current I _c is small, the voltage V _y is small, the voltage V _x is large, and the voltage V _p in equation ( ₁ ) is _small . When the insulation resistance value decreases, the detection signal current changes accordingly.
I _c increases, voltage V _y increases, while voltage V _x decreases, and voltage V _p in equation (1) increases. By recording this situation with a recorder R _e , insulation The status of materials RI ₁ and RI ₂ can be monitored.

Note that the relay of the signal receiver RV is restored due to a short circuit between the axles when a vehicle passes through an adjacent portion, but this can be prevented by a vehicle detection output from a separate vehicle detection device that sends out an alarm at this time.

Therefore, it is possible to automatically detect the insulation resistance values of the insulating materials RI ₁ and RI ₂ and issue an alarm according to the decrease in the insulation resistance values, as well as monitor changes in the insulation resistance values. It becomes easy to deal with insulation deterioration, and the danger caused by erroneous reception of ATC signals etc. can be eliminated.

Furthermore, the existing equipment can be used as is without having any effect on existing signaling equipment, etc., making it easy to expand the equipment.

However, the distance l _n is a certain distance corresponding to the deterioration of the insulating materials RI ₁ and RI ₂ , since the rails R ₁ to _{R 4} only need to exhibit an impedance that causes a sufficient change in the voltage V _x . It is sufficient to set the coil as above.
If the PC detects the detection signal current I _c flowing to the rail, it is certain that the current flowing to the insulating materials RI ₁ and RI ₂ can be detected, but the same is true even if the output current I ₀ is detected, and in this case assumes that the distances l _n between both sections T ₁ and T ₂ are unequal, and that the impedance circuit Z ₁ ~
The impedance of Z ₄ may be set individually.

Note that a band wave generator may be used as the impedance circuits Z ₅ and Z ₆ , and a meter relay or the like may be used instead of the recorder _Re , which issues an alarm when the voltage V _p exceeds a specified value. and signal receiver
RV may be omitted, and V _x and V _y may be interchanged during the calculation of equation (1).

In addition, the track sections T ₁ and T ₂ can be applied not only to a 2-wire track, but also to a 3-wire track that uses 3 rails to serve both narrow gauge and wide gauge; in this case, is the impedance circuit Z ₁ ~ _{Z 4}
Various modifications can be made, such as connecting each rail in the same way using a circuit equivalent to the above.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, it is possible to automatically detect the inter-rail insulation status of adjacent track sections, thereby ensuring early detection of insulation deterioration and countermeasures, thereby reducing the risk of signal current leakage. A significant effect can be obtained if this is prevented and asynchronous signal currents are passed individually to both adjacent track sections.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the present invention. R ₁ ~ _{R 4} ...Rail, RI ₁ , RI ₂ ...Insulation material, R _L ...
...Resistor, T ₁ , T ₂ ... Track section, Z ₁ to _{Z 6} ... Impedance circuit, OSC ... Signal generator, D...
...divider, R _e ...recorder, RV ...signal receiver,
_fs ...Detection frequency, _Ip , _Ic ...Detection signal current,
V _x , V _y ... voltage, l _n ... distance.

Claims (1)

[Claims] 1. First to fourth impedances Z1 to Z4 exhibiting low impedance in the detection signal f _s
and a detection signal generation means for generating the detection signal _fs .
OSC, rail current detection means PC that detects rail current and generates a signal corresponding to the current value, and detects the voltage between adjacent rails on the front and rear sides that are insulated with insulating materials RI ₁ and RI ₂ . It is composed of a voltage detection means RV between adjacent rails, and insulation resistance measuring parts D and _Re that detect the insulation resistance between adjacent rails, and the first and second impedances Z ₁ and Z ₂ are insulating materials RI ₁ , The third and fourth impedances Z 3 and Z 4 are connected to the front rails R ₁ and R ₂ and the rear rails R ₃ and R ₄ of the portion insulated by RI ₂ , and the third and fourth impedances Z ₃ and Z ₄ are and the second impedance at a predetermined distance from the respective rails, and the detection signal generating means OSC is connected to the third and fourth impedances.
A detection signal is supplied between the front and rear rails, which are insulated with an insulating material, from the impedance side of the rail. The adjacent rail voltage detection means RV detects the voltage generated between adjacent rails via the insulating material RI ₁ , and the insulation resistance measuring section detects the rail current detection means. 1. A rail insulation resistance detection device, characterized in that it measures the insulation resistance of an insulating material based on a signal generated by an adjacent rail voltage detection means and a signal generated by an adjacent rail voltage detection means.