JP2009220706A - Method and device for calculating current passing parallel connection point of different power source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for calculating the current passing a parallel connection point of different power sources for detecting the current value of the current passing the parallel connection point running in a selector switch by an foundation CT when executing the parallel connection of different power sources at a selector section of an AC electric railroad vehicle. <P>SOLUTION: The current passing the parallel connection point running in first and second selector switches is detected when closing the first selector switch between a trolley of a power source A and an intermediate section and the second selector switch between a trolley of a power source B and the intermediate section in parallel to the intermediate section insulated from both trolley cables in a selector section between the power sources A and B of an AC electric railroad vehicle by the AT AC feeding system. The detection is executed by using a measurement unit by an AC current sensor provided on an outer wire side of an automatic transformer provided between a feed line and a trolley cable with a rail as a neutral point in a vicinity of the first and second selector switches, and a parallel connection point passing current calculating unit capable of obtaining the parallel connection point passing current value by performing the arithmetic calculation of each current value on the power source A side and the power source B side obtained thereby. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an output driver for outputting output data such as calculation results and data read from a memory to an external device in a semiconductor integrated circuit.

In an electric railway of the AT AC feeding system, there is a portion where a trolley wire that supplies electric power from a substation to a train is switched to a trolley wire from another substation or a switch. A switching section is provided for switching the trolley line.
FIG. 5 is a diagram for explaining a switching section of a feeding section in an electric railway. 5B, 5C, and 5D are diagrams for explaining the switch operation in the switching section.

  In FIG. 5, 2 is a trolley wire connected to the power source A of the A substation, 3 is a trolley wire connected to the power source B of the B substation, 4 is a rail, 51 and 52 supply power to the train 21. A switching switch (for example, a vacuum switch) for switching the trolley line, 53 and 54 are air sections (a section in which two overhead lines are arranged side by side), 15 is an intermediate section, and 21 is a train. In addition, the control apparatus 10 has shown the apparatus which performs switching control of the switching switches 51 and 52. FIG.

  Then, as shown in the example of FIG. 5A, the switching section 1 includes a trolley wire 2 that supplies power from the A substation as the power source A, and a trolley wire 3 that supplies power as the power source B from the B substation. It is provided at the switching feeder section.

  In the above configuration, FIG. 5B shows the open / close state of the switching switch when the train 21 is traveling in the section of the trolley line 2. In this state, the switching switch 51 is “ON” and the switching switch 52 is “OFF”. Therefore, the intermediate section 15 in the switching section 1 is in a state of being fed by the trolley line 2 of the power source A.

  FIG. 5C shows the open / close state of the switching switch when the train 21 enters the switching section 1. In this state, the switching switch 51 is switched from “ON” to “OFF”, and the switching switch 52 remains “OFF”. Therefore, the intermediate section 15 in the switching section 1 is temporarily in a power failure state.

  FIG. 5D shows the open / close state of the switching switch when the train 21 enters the switching section 1 and approaches the air section 54. In this state, the switching switch 51 remains “OFF”, and the switching switch 52 switches from “OFF → ON”. Accordingly, the intermediate section 15 in the switching section 1 is fed by the trolley line 3 of the power source B.

  When the switching of the trolley line in the switching section 1 is completed by the above procedure and the train 21 moves to the section of the trolley line 3, the open / close state of the switching switches 51 and 52 of the switching section 1 is shown in FIG. Restore to the state.

  The temporary power failure time of the intermediate section 15 described above is usually about 0.3 seconds. For this reason, the conventional switching method mentioned above is called 0.3 second power failure switching.

  By the way, when switching the power supply by the above-described method, a temporary power failure of about 0.3 seconds occurs, the main converter of the train (converter or inverter, etc.) is temporarily stopped, and the train air conditioner is stopped. To do. For this reason, it is necessary to restart these devices, and there is a problem that this restart takes time. In addition, the occurrence of surge voltage due to the opening and closing of the switching switch may have a noise effect on the equipment in the train.

  In addition, after the power failure was restored, the magnetizing inrush current flowed to the main transformer (receiving transformer) in the train, which could cause unnecessary operation of the protective relay and stress the power equipment. Of course, for safety reasons, the equipment in the train is designed to withstand the noise and stress, but it is best to prevent the noise and stress from occurring. If the generation of noise and stress can be reduced, the burden on equipment in the train can be reduced and the cost can be reduced. For this reason, it has been desired to suppress the generation of the noise and stress.

  In order to deal with such a problem, a feeding switching control device of the prior art has been disclosed (see Patent Document 1). An object of the prior art feeder switching control device is to provide a feeder switching control device that improves the ride comfort of passengers without shocking the electrical equipment mounted on the train.

  The outline of the configuration of this conventional feeder switching control apparatus will be described with reference to FIG. 5. In the feeder switching control apparatus, only the switching switch 51 is turned on when the train 21 does not pass through the intermediate section 15. The power is supplied to the intermediate section 15. When the train 21 passes through the intermediate section 15 and there is no risk of overcurrent when the trolley wires 2 and 3 are connected, the two switches are opened and closed for a predetermined period after the entire train 21 enters the intermediate section 15. The devices 51 and 52 are turned on, and power is supplied from the trolley wires 2 and 3 to the intermediate section 15 (parallel feeding). After a predetermined period, only the switching switch 52 is turned on, and power is supplied from only the power source B to the intermediate section 15. In this case, since a power failure does not occur when switching between different power sources, the electric equipment mounted on the train is not shocked, and acceleration is not interrupted even during train power running, so that the ride comfort is improved.

In addition, when both switching switches 51 and 52 are turned on at present, the measurement of the current passing through the parallel connection point flowing through the switching switches 51 and 52 due to the potential difference between the different power sources is performed using an alternating current sensor ( CT) (for example, refer nonpatent literature 1).
JP 2000-203316 A Yoshifumi Mochinaga, Koji Anjo, Tetsuo Tsutsuka, “Development of optical CT input type switching switch fault detection relay”, RTRI REPORT Vol. 15, no. 6, 2001.6

However, in the above-described feeder switching control device of the prior art, when measuring the current passing through the parallel connection point of two different power sources connected in parallel (parallel feeding by the switching switch), in addition to the current equipment, On the other hand, it is necessary to newly provide a CT, and this increases the cost of the equipment.
The present invention has been made to solve such a problem, and its object is to newly connect two different power sources in parallel by switching on two switching switches in parallel in a switching section in an electric railway. Another object of the present invention is to provide a different power source parallel connection point passing current calculation device and method for detecting a current value of a parallel connection point passing current flowing in a switching switch by using an existing CT which is already provided.

  The different power source parallel connection point passing current calculation device of the present invention is different from the trolley line of the power source A of the A substation (ASS) of the AC electric railway using the AT AC feeding system and the A substation (ASS). In the switching section provided in the power distribution section (SP) between the trolley line of the power source B of the B substation (BSS), the intermediate section provided insulated from the two trolley lines, A first switching switch for connecting or opening a trolley wire and the intermediate section and a second switching switch for connecting or opening the trolley wire of the power source B and the intermediate section are connected in parallel. A parallel connection point passing current calculation device for detecting a parallel connection point passing current flowing in the case where a rail is used as a neutral point in the vicinity of each of the first and second switching switches. Line spacing The current value of the current sucked up from the rail by the installed autotransformer (AT) and the current induced on the trolley line side by the existing autotransformer (AT) is provided on the outer line side of the autotransformer. The measured value of the current flowing through the measurement unit measured by the AC current sensor, the A transformer on the A transformer side, and the B transformer on the B transformer side is calculated by an arithmetic expression and passed through the parallel connection point. And a parallel connection point passing current calculation unit for obtaining a current.

  The different power source parallel connection point passing current calculation apparatus according to the present invention is configured to synthesize a measurement current of an AC current sensor corresponding to each autotransformer, in which the arithmetic expression is a current value that matches a current flowing through the parallel connection point. It is the arithmetic expression which shows the combination of these.

  The parallel power connection parallel point passing current calculation device of the present invention is configured such that when there is no train as a load between the first and second switching switches, the parallel connection point passing current calculation unit includes the A substation. The parallel connection point passing current is obtained by performing an arithmetic operation in consideration of the polarity of the value of the current flowing through the side autotransformer and the B transformer side autotransformer.

  In the apparatus for calculating the passing current of different power source parallel connection points according to the present invention, an upstream line and a downstream line exist between the A substation and the B substation, and the feeders connect the upstream and downstream feeders. When there is a trolley line tie that connects each tie line of the tie line, the up line, and the down line, the parallel connection point passing current calculation unit includes a single transformer on the A substation side of each of the up line and the down line The parallel connection point passing current, which is arithmetically calculated in consideration of the polarity of the current value flowing through the autotransformer on the B substation side, is obtained.

  When the electric train as a load exists between the first and second switching switches, the parallel connection point passing current calculation unit of the present invention is configured so that the parallel connection point passing current calculation unit includes the A substation. The parallel connection point passing current is obtained by performing an arithmetic operation in consideration of the polarity of the value of the current flowing through the side autotransformer and the B transformer side autotransformer.

  In the apparatus for calculating the passing current of different power source parallel connection points according to the present invention, an upstream line and a downstream line exist between the A substation and the B substation, and the feeders connect the upstream and downstream feeders. When there is a trolley line tie that connects each tie line of the tie line, the up line, and the down line, the parallel connection point passing current calculation unit includes a single transformer on the A substation side of each of the up line and the down line The parallel connection point passing current, which is arithmetically calculated in consideration of the polarity of the current value flowing through the autotransformer on the B substation side, is obtained.

  The different power source parallel connection point passage current calculation device of the present invention has a preset threshold current indicating an abnormal current value, and detects whether or not the parallel connection point passage current exceeds the threshold current. It further has these.

  The method for calculating the passing current of different power source parallel connection points of the present invention is different from the trolley line of the power source A of the A substation (ASS) of the AC electric railway using the AT AC feeding system and the A substation (ASS). In the switching section provided in the power distribution section (SP) between the trolley line of the power source B of the B substation (BSS), the intermediate section provided insulated from the two trolley lines, A first switching switch for connecting or opening a trolley wire and the intermediate section and a second switching switch for connecting or opening the trolley wire of the power source B and the intermediate section are connected in parallel. A parallel connection point passing current calculation method for detecting a parallel connection point passing current flowing in the case where the measurement unit uses a rail as a neutral point in the vicinity of each of the first and second switching switches. Electric wires and cables The current value of the current drawn up from the rail and the current induced on the trolley wire side by the autotransformer (AT) installed between the transformer wires is provided on the outer wire side of the autotransformer. The measurement process using the existing AC current sensor and the parallel connection point passing current calculation unit measure the current flowing through the A transformer-side autotransformer and the B transformer-side autotransformer. And a parallel connection point passing current calculation process for calculating a value and calculating the parallel connection point passing current.

  The different power source parallel connection point passing current calculation method of the present invention is a combination of measurement currents of alternating current sensors corresponding to each autotransformer, wherein the arithmetic expression is a current value that matches a current flowing through the parallel connection point. It is the arithmetic expression which shows the combination of these.

  The parallel power connection point passing current calculation method according to the present invention is such that when there is no electric train as a load between the first and second switching switches, the parallel connection point passing current calculation unit is configured such that the A substation The parallel connection point passing current is obtained by performing an arithmetic operation in consideration of the polarity of the value of the current flowing through the side autotransformer and the B transformer side autotransformer.

  The parallel power connection point passing current calculation method of the present invention is such that when a train as a load is present between the first and second switching switches, the parallel connection point passing current calculation unit is configured such that the A substation The parallel connection point passing current is obtained by performing an arithmetic operation in consideration of the polarity of the value of the current flowing through the side autotransformer and the B transformer side autotransformer.

  As described above, according to the present invention, in the switching section of the trolley line in the electric railway, when the power sources of two different substations are connected in parallel in the intermediate section by adding two switching switches in parallel, Without providing a CT for detecting the current value flowing between different power sources, the current value of the parallel connection point passing current flowing through the switching switch can be obtained by experiment or field test using the existing CT. Because it is possible to calculate and detect as a predicted value by using an arithmetic expression, it is possible to easily calculate the parallel connection point passing current without providing new equipment, so it can be easily applied to existing equipment. The effect that it can be obtained.

  In addition, according to the present invention, the parallel connection point passing current that flows in a normal state is predicted by calculating by an arithmetic expression obtained by an experiment or a field test, and a threshold current corresponding to the predicted plurality of current values. By setting a value, there is an effect that it is possible to determine the presence or absence of an accident at no load (a state where no train is present) or at a load (a state where a train is present).

Hereinafter, a different power source parallel connection point passing current calculation device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a different power source parallel connection point passing current calculation apparatus according to the embodiment. In this embodiment, the current value measured by an existing AC current sensor is calculated by an arithmetic expression described later by an experiment using an actual feeder circuit, and the direction of each current, that is, the polarity of the current value is taken into consideration. By substituting and performing addition / subtraction processing, the current value measured by the existing AC current sensor is synthesized, thereby estimating the parallel connection point passing current flowing through the switching switch in which different power sources are connected in parallel.
The different power source parallel connection point passage current calculation device 200 of this embodiment includes a detection unit 201, a parallel connection point passage current calculation unit 202, and an abnormal current detection unit 203.
In order to clarify the operation of each part of the different power source parallel connection point passing current calculation device 200, an AC electric railway feeding circuit using the AT AC feeding method for measuring the parallel connection point passing current will be described. . In the following description of the embodiment, the parallel connection point passing current at the time of connecting different power sources in the down line is taken as an example, and the arithmetic formula described later is used. Can be used in the same manner, and can correspond to different power supply connections on both the upstream and downstream lines.

As shown in FIG. 1, switching feeders 111, 112, 113, and 114 are provided at feeder divisions that are power source switching points of different power sources at substation A and substation B. In the present embodiment, the feeder circuit will be described as a double line of an upstream line and a downstream line.
In the substation A, a trolley wire 101 is connected to one end (positive side) of the power source, and this trolley wire 101 is branched into an upstream trolley wire 101U and a downstream trolley wire 101D.
In the substation A, a feeder 102 is connected to the other end (negative electrode side) of the power source, and this feeder 102 is branched into an upstream feeder 102U and a downstream feeder 102D.

Similarly, in the substation B, a trolley wire 100 is connected to one end (positive side) of the power source, and this trolley wire 100 is branched into an upstream trolley wire 100U and a downstream trolley wire 100D.
In the substation B, a feeder 104 is connected to the other end (negative electrode side) of the power source, and the feeder 104 is branched into an upstream feeder 104U and a downstream feeder 104D.
On the down line, between the trolley line 101D and the trolley line 100D, switching switches 111 and 113 are connected in series with an intermediate section as a switching section in a feeder section between substation A and substation B. It is connected to and inserted.
Similarly, on the upstream line, between the trolley line 101U and the trolley line 100U, the switching switches 112 and 114 serve as an intermediate section as a switching section in a feeder section between the substation A and the substation B. It is inserted and connected in series.

The autotransformer 11 includes windings 11T and 11F. For example, one end (winding 11T side) is connected to a trolley wire 101D on the down line, and the other end (winding 11F side) is a down line feeder. 102D, that is, inserted between the trolley wire 101D and the feeder wire 102D, the middle point (connection point of the windings 11T and 11F) is connected to the rail 120D of the down line, and the current flowing through the rail 120D is fed. As a result, a current is induced from the rail 120D toward the trolley wire 101D.
The autotransformer 12 is composed of windings 12T and 12F. For example, one end (winding 12T side) is connected to an upstream trolley wire 101U, and the other end (winding 12F side) is an upstream wiring. 102U, that is, inserted between the trolley wire 101U and the feeder wire 102U, the middle point (the connection point of the windings 12T and 12F) is connected to the rail 120U of the up line, and the current flowing through the rail 120U is fed. As a result, a current is induced from the rail 120U toward the trolley wire 101U.

The autotransformer 13 is composed of windings 13T and 13F. For example, one end (winding 13T side) is connected to a trolley wire 100D on the down line, and the other end (winding 13F side) is a down line feeder. 104D, that is, inserted between the trolley wire 100D and the feeder wire 104D, the midpoint (connection point of the windings 13T and 13F) is connected to the rail 120D of the down line, and the current flowing through the rail 120D is supplied to the feeder wire 104D. As a result, a current is induced from the rail 120D toward the trolley wire 100D.
The autotransformer 14 is composed of windings 14T and 14F. For example, one end (winding 14T side) is connected to the trolley wire 100U of the up line, and the other end (winding 14F side) is the feeding line of the up line. 104U, that is, inserted between the trolley wire 100U and the feeder wire 104U, the middle point (connection point of the windings 14T and 14F) is connected to the rail 120U of the up line, and the current flowing through the rail 120U is supplied to the feeder wire 104U. As a result, a current is induced from the rail 120U to the trolley wire 100U side.

The AC current sensor CT11T is disposed on the outer line side of the winding 11T and measures the current flowing through the winding 11T, that is, the siphoning current flowing from the rail 120D to the trolley wire 101D.
The AC current sensor CT11F is disposed on the outer line side of the winding 11F, and measures the current flowing through the winding 11F, that is, the suction current flowing from the rail 120D to the feeder 102D.
The AC current sensor CT12T is disposed on the outer line side of the winding 12T, and measures the current flowing through the winding 12T, that is, the siphoning current flowing from the rail 120U to the trolley wire 101U.
The AC current sensor CT12F is disposed on the outer line side of the winding 12F, and measures the current flowing through the winding 12F, that is, the suction current flowing from the rail 120U to the feeder 102U.

The AC current sensor CT13T is disposed on the outer line side of the winding 13T, and measures the current flowing through the winding 13T, that is, the siphoning current flowing from the rail 120D to the trolley line 100D.
The AC current sensor CT13F is disposed on the outer line side of the winding 13F, and measures the current flowing through the winding 13F, that is, the suction current flowing from the rail 120D to the feeder 104D.
The AC current sensor CT14T is disposed on the outer line side of the winding 14T, and measures the current flowing through the winding 14T, that is, the siphoning current flowing from the rail 120U to the trolley line 100U.
The AC current sensor CT14F is disposed on the outer line side of the winding 14F, and measures the current flowing through the winding 14F, that is, the suction current flowing from the rail 120U to the feeder 104U.
Arrangement on the outer wire side of each winding mentioned above means that it is disposed in the vicinity of the autotransformer in the wiring (external wire) connecting the winding of the autotransformer, the feeder and the trolley wire. Show.

In order to calculate the passing current that flows through the parallel connection point, the detection unit 201 periodically or the control instruction receives the measured current values of the AC current sensors CT11T, CT11F, CT12T, CT12F, CT13T, CT13F, CT14T, and CT14F. Detect if there is.
As described above, the parallel connection point passing current calculation unit 202, when a periodic or control instruction is input, depending on whether information indicating that the train is present in the intermediate section is input from the outside, Using the current value of each alternating current sensor input from the detection unit 201, the switching switch 111 and 113, the switching switch 112 and 114, or both flow, That is, a parallel connection point passing current flowing between different power sources is calculated. Here, when there is no load in the switching section, the parallel connection point passing current calculation unit 202 selects any one of formulas (1) to (5), which will be described later, while the load exists in the switching section. , (6) to (9) are selected, and the parallel connection point passing current is calculated.

Expressions (1) to (5) described above are simulated circuits when there is no tie between the upper and lower lines (double line) (FIG. 1) and when there is a tie (FIG. 2) (FIGS. 1 and 2 described later). Thus, an experiment formula (arithmetic formula) in the current path obtained from the result of the current distribution in this experiment was conducted by experimenting when different power sources were connected in parallel at the feeder section (SP) with no load. That is, in FIG. 1, when there is no tie between the upper and lower lines, the passing current I _SWO passing through the feeder section is transferred to the electric circuit on the connection point side (from the switching switch 111 side to the switching switch 113 side in the down line). flows as substantially passing current I _SWO, the current value of the passing current I _SWO, also detects the current value flowing through each autotransformer, using the current value of any of the autotransformer windings, it was measured Whether or not the passing current I _SWO can be obtained was evaluated, and based on the evaluation result, it was determined that the measured value of each alternating current sensor was calculated by any one of the equations (1) to (5). Here, in the feeder circuit, the current flowing through each autotransformer can be detected by the existing AC current sensors CT11T, CT11F, CT12T, CT12F, CT13T, CT13F, CT14T, and CT14F. Then, in the actual feeder circuit, the current value of the passing current I _SWO flowing through the switching switch is measured by the current sensor, and the current value flowing through each of the existing AC current sensors is detected and detected. The current value calculated by substituting the current into each arithmetic expression is compared, and it is confirmed that the detected current value is substantially equal to the result calculated by the arithmetic expression. Expressions (1) to ( 5) Verify that the mathematical expression is correct.

That is, as shown in FIG. 1, when there is no tie between the upper and lower lines when there is no load between the trolley line and the rail, the current value alone of the AC current sensor CT installed on the outer line side of each winding, Alternatively, the passing current I _SWO can be estimated by combining and synthesizing the current values of the AC current sensors CT installed on the outer side of each winding (adding the polarity, that is, calculating in consideration of the polarity of the current value). As can be seen, formulas (1) to (5) are generated as a combination of currents obtained from the respective AC current sensors, and installed on the outside lines of these windings 11T, 11F, 12T, 12F, 13T, 13F, 14T and 14F. The current flowing between the different power sources A and B can be easily estimated by substituting the current value measured using the AC current sensor into any one of the mathematical expressions (1) to (5). Can.

On the other hand, as shown in FIG. 2, when there is no load between the trolley line and the rail, when there is a tie between the upper and lower lines, it is an external line between the substation (SS) and the power distribution station (SP) It has been experimentally found that when the trolley line (T line) and the feeder line (F line) are connected in parallel on the down line, the flow is as shown in FIG.
In each winding, the tie is provided between the arranged alternating current sensor CT and the winding of the autotransformer.

Therefore, in FIG. 2, when both of the switching switches 111 and 113 are in the on state, the other wires 11F, 12T, 12F, and 13F are connected to the outer wires connected to the winding 11T and the winding 13T (down line). , About 3 times as much current flows as compared with 14T and 14F. Here, it has been experimentally obtained that substantially the same current flows through the other windings 11F, 12T, 12F, 13F, 14T, and 14F. Therefore, by passing one or both of the current values flowing through the windings 11T and 13T and any one or combination of the current values flowing through the windings 11F, 12T, 12F, 13F, 14T, and 14F Current I _SWO can be estimated

  That is, as shown in FIG. 2, when there is no load between the trolley wire and the rail and there is a tie between the upper and lower wires, substantially the same current flows through the winding 11T and the winding 13T, and the winding 11F It can be seen that substantially the same current flows through the winding 13F, substantially the same current flows through the winding 12T and the winding 14T, and almost the same current flows through the winding 12F and the winding 14F. An AC current sensor that generates Formulas (1) to (5) as a combination of currents obtained from the AC current sensor and is connected to the external lines of these windings 11T, 11F, 12T, 12F, 13T, 13F, 14T, and 14F By substituting the current value measured by using any one of the equations (1) to (5), the current flowing between the different power sources A and B can be easily estimated. Moreover, the pattern of the combination of the measured value of AC current sensor CT which synthesize | combines the current value which AC current sensor CT measured from Formula (1)-(5), and estimates the current value of the electric current which flows into a parallel connection point. In any of the above, any arithmetic expression (computation arithmetic expression) pattern may be used.

Further, as shown in FIGS. 3 and 4, when a load exists between the trolley wire and the rail, the simulation circuit was similarly evaluated to generate arithmetic expressions (6) to (9). Here, from the formulas (6) to (9), in the combination pattern of the measured values of the alternating current sensor CT, the current values measured by the alternating current sensor CT are combined to estimate the current flowing through the parallel connection point. Any arithmetic pattern may be used.
From the results of the circuit experiment, as shown in FIG. 3, when there is a load between the trolley line and the rail and there is no tie on the down line, I _SWL1-1 = The currents flowing through the _windings 11T and 11F by _ISWSS1 are substantially the same. In the same case, the current values of the currents flowing through the _windings 13T and 13F are substantially the same due to I _SWL3-1 = I _SWSS2 which is one of the passing currents. In addition to the case of the down line, when considering the case of paralleling different power sources on the up line, the I _SWL1-1 is the current value of the current flowing through the windings 11T and 11F and the current value of the current flowing through the windings 12T and 12F. It is obtained by combining _Similarly, 13T also _{I SWL3-1 = I SWSS2, 13F,} 14T, I SWL3-1 = I SWSS2 even when subjected to different power parallel in both the upper and lower lines of synthesizing current flowing to 14F are obtained.

Also, as shown in FIG. 4, when a tie is present when there is a load between the trolley wire and the rail, the current flowing through the winding 11T is a combination of the current values flowing through the windings 11F, 12T, and 12F. It is almost equal to the thing. Here, the current values of the currents flowing through the windings 11F, 12T, and 12F are substantially equal. That is, the current value of the current flowing through the windings 11F, 12T, and 12F is approximately 1/3 of the current value of the current flowing through the winding 11T.
Further, the current flowing through the winding 13T is substantially equal to the value obtained by combining the current values flowing through the windings 13F, 14T, and 14F. Here, the current values of the currents flowing through the windings 13F, 14T, and 14F are substantially equal. That is, the current value of the current flowing through the windings 13F, 14T, and 14F is approximately 1/3 of the current value of the current flowing through the winding 13T.
For this reason, the combination of the winding 11F of the autotransformer 11 and the winding 12F of the autotransformer 12 on the one power source A side with respect to the switching switch (equation (6)), or the switching switch A combination (formula (7)) of the winding 13F and the winding 14F of the autotransformer 13 on the one power source B side is generated. In FIG. 4, I _SWL1-2 = I _SWSS1 and I _SWL3-2 = I _SWSS2 .

For the reasons described above, these arithmetic expressions (1) to (9) substitute the current value of the measurement result of each AC current sensor CT when different power sources are connected in parallel in FIGS. _Thus , it is possible to estimate the passing currents I _SWO , I _SWSS1 , and I _SWSS2 that pass through the _{feeding section} . In addition, the arithmetic expressions (1) to (9) take into account the polarity according to the direction of current flowing through each AC current sensor based on the results of actual measurement and simulation circuit experiment, that is, when the current value is synthesized, The polarities are taken into consideration.
As described above, the arithmetic expressions (1) to (9) are the current values that match the currents flowing through the parallel connection points of the upstream and downstream lines in the actual measurement and the simulation circuit experiment. The combination of the measurement currents of the alternating current sensor CT corresponding to the autotransformer is shown.
When the parallel connection point passage current calculated by the parallel connection point passage current calculation unit 202 exceeds a preset threshold current, the abnormal current detection unit 203 outputs an abnormal current as a determination result of an accident or the like. To do.
Hereinafter, calculation of parallel connection point passage currents I _SWO , I _SWSS1 , and I _SWSS2 corresponding to each state will be described.

<Calculation of parallel connection point passing current I _SWO = I _SWO1 = I _SWO2 in no load (no train)>
In the feeder circuit of FIG. 1, in SS (or SP), both of the switching switches 111 and 113 provided between the downstream trolley line 101D and the trolley line 100D are turned on (turned on), and the substation Detected when no load is present between the trolley wire 101D or 100D and the rail 120D when the different power sources of A and the substation B are connected (ie, no train is present in the middle section). The unit 201 detects the measured current values I _CT11FO and I _CT12FO of the AC current sensors CT11F and CT12F, and outputs the detected current values I _CT11FO and I _CT12FO to the parallel connection point passing current calculation unit 202.
Here, the current value I _CT11FO is a current that flows through the AC current sensor CT11F when connected in parallel with different power sources without load.
The current value I _CT12FO is a current that flows through the AC current sensor CT12F when connected in parallel with different power sources without load.

Next, FIG. 2 is similar to FIG. 1 in the structure of the feeder circuit, but is different from the feeder circuit in FIG. 1 between the feeder wires 102D and 102U and between the feeder ties 102T and 104D and 104U. A trolley wire tie 101T is provided between the electric wire tie 104T and the trolley wires 101D and 101U, and a trolley wire tie 100T is provided between the trolley wires 100D and 100U.
In the feeder circuit of FIG. 2, in SS (or SP), both of the switching switches 111 and 113 provided between the downstream trolley line 101D and the trolley line 100D are turned on, and the substation A and the substation When each of the different power sources B is in a connected state, if there is no train between the trolley wire 101D or 100D and the rail 120D (that is, there is no train in the intermediate section), the detection unit 201 is AC. The current values I _CT11FO , I _CT11TO , I _CT12FO and I _CT12TO measured by the current sensors CT11F, CT12F, CT11T and CT12T are detected, and the detected current values I _CT11FO , I _CT11TO , I _CT12FO and I _CT12TO are connected in parallel. It outputs to the point passage current calculation part 202.
Here, the current value I _CT11TO is a current that flows through the AC current sensor CT11T when no power is connected in parallel with different power sources.
The current value I _CT12TO is a current that flows through the AC current sensor CT12T when no power is connected in parallel with different power sources.
The expressions (1), (2), (3), (4) and (5) to be described below indicate that the upper and lower trolley lines can be used regardless of whether the different power supply parallel connection in the SP is performed on the upstream line or the downstream line. And it can be used regardless of the presence or absence of the tie of the vertical feeder.

When the information indicating that the train 200 is present in the intermediate section is not input from the outside, the parallel connection point passing current calculation unit 202 performs parallel calculation _according to the following equation (1) using the input current values I _CT11FO and I _CT12FO. A connection point passing current I _SWO1 is calculated.
Here, the detection unit 201 detects the measured current values I _CT11FO and I _CT12FO of the AC current sensors CT11F and CT12F, respectively, and outputs the detected current values I _CT11FO and I _CT12FO to the parallel connection point passing current calculation unit 202. To do.

Also, the parallel connection point passing current I _SWO1 can be calculated by the following equation (2). In this case, the detection unit 201 detects the current values I _CT13FO and I _CT14FO measured by the AC current sensors CT13F and CT14F, respectively. And the detected current values I _CT13FO and I _CT14FO are _output to the parallel connection point passing current calculation unit 202.
Here, the current value I _CT13FO is a current that flows through the AC current sensor CT13F when connected in parallel with different power sources without load.
The current value I _CT14FO is a current that flows through the AC current sensor CT14F when connected in parallel with different power sources without load.
The parallel connection point passage current calculation unit 202 calculates the parallel connection point passage current I _SWO1 from the input current values I _CT13FO and I _CT14FO by the following equation (2).

The parallel connection point passing current I _SWO1 can also be calculated by the following equation (3). In this case, the detection unit 201 measures the current values I measured by the AC current sensors CT11F and CT12F, CT13F and CT14F, respectively. _CT11FO , _ICT12FO , _ICT13FO, and _ICT14FO are detected, and the detected current values _ICT11FO , _ICT12FO , _ICT13FO, and _ICT14FO are _output to the parallel connection point passing current calculation unit 202.
The parallel connection point passage current calculation unit 202 calculates the parallel connection point passage current I _SWO1 from the input current values I _CT11FO , I _CT12FO , I _CT13FO and I _{CT14FO according} to the following equation (3).

+/− in the equation (1) indicates the polarity of the current, and when the parallel connection point passing current _ISWO1 flowing from the substation A to the substation B is positive (+), it is “+”. The coefficient “2” is multiplied because it is calculated from two sensors, so that the equation (3) matches the current value.
-/ + In the equation (2) indicates the polarity of the current, and when the parallel connection point passing current _ISWO1 flowing from the substation A to the substation B is positive (+), it is "-". The coefficient “2” is multiplied because it is calculated from two sensors, so that the equation (3) matches the current value.
+/− in the equation (3) indicates the polarity of the current, and when the parallel connection point passing current I _SWO1 flowing from the substation A to the substation B is positive (+), I _CT11FO , I _CT12FO Is _{calculated as} +, I _{CT13FO and} I _{CT14FO as-,} and the arithmetic operation is performed by matching the direction and polarity of current flow. This adds to the polarity.
When using the equations (1) to (3), the parallel connection point passage current calculation unit 202 performs an arithmetic operation in consideration of the polarity of each current value output from each AC current sensor CT11F and CT12F, CT13F and CT14F. A connection point passing current I _SWO1 is calculated.

In FIG. 1, the current I ₁₀₁ is a current that flows directly through the switching switches 111 and 113 without passing through the AC current sensor CT, and the current I _J101 is “the winding 11T of the single- _turn transformer 11” → “ This is the circulating current flowing through the path of “trolley wire 101D” → “switching switch 111” → “switching switch 113” → “trolley wire 100D” → “winding 13T of the autotransformer 13” → “rail 120D”.

When the information indicating that the train 200 is present in the intermediate section is not input from the outside, the parallel connection point passing current calculation unit 202 performs the following (according to the input current values I _CT11FO , I _CT11TO , I _CT12FO and I _CT12TO ) 4) The parallel connection point passing current I _SWO2 is calculated from the equation (4). Similarly in the case of FIG. 2, the equation (4) can be used.
Here, I _SWO1 = I _SWO2 = I _SWO .

1 and 2, the parallel connection point passing current I _SWO2 can also be calculated by the following equation (5). In this case, the detection unit 201 detects the alternating current sensors CT13F and CT14F, CT13T, and CT14T. The measured current values I _CT13FO , I _CT14FO , I _CT13TO and I _CT14TO are detected, and the detected current values I _CT13FO , I _CT14FO , I _CT13TO and I _CT14TO are _output to the parallel connection point passing current calculation unit 202. .
Here, the current value I _CT13TO is a current that flows through the AC current sensor CT13T when no power is connected in parallel with different power sources.
The current value I _CT14TO is a current that flows to the AC current sensor CT14T when no power is connected in parallel with different power sources.
The parallel connection point passing current calculator 202, the inputted current value _{I CT13FO, I CT14FO,} the _{I CT13TO} and _{I CT14TO,} by the following equation (5), calculates the parallel connection point passing current _{I SWO2.} Here, an expression that can be expressed by an arithmetic expression combining the expressions (4) and (5) can be used. In other words, the arithmetic expression may be changed depending on which AC current sensor CT is used.

+/− in the equation (4) indicates the polarity of the calculated current, and when the parallel connection point passing current I _SWO2 flowing from the substation A to the substation B is positive (+), “+ "
-/ + In the formula (5) indicates the polarity of the calculated current, and when the parallel connection point passing current I _SWO2 flowing from the substation A to the substation B is positive (+), “− "
In FIG. 2, a current I ₁₀₂ is a current that flows directly through the switching switches 111 and 113 without passing through the alternating current sensor CT.
A current I ₂₀₂ in FIG. 2 is a current that directly flows through the switching switches 111 and 113 via the AC current sensor CT12T and the trolley wire tie 101T.

The current I _J102 in FIG. 2 is “winding 11T of the autotransformer 11” → “trolley wire 101D” → “switching switch 111” → “switching switch 113” → “trolley wire 100D” → “single transformer 13 is a circulating current flowing through the path of winding 13T ”→“ rail 120D ”.
The current I _J202 in FIG. 2 is “winding 12T of the autotransformer 12” → “trolley wire tie 101T” → “trolley wire 101D” → “switching switch 111” → “switching switch 113” → “trolley wire 100D”. “→ Trolley wire tie 100T” → “winding 14T of auto-transformer 14” → circulating current flowing through the path of “rail 120U”.

As described above, the above equation (1) for obtaining the parallel connection point passing current at no load from the current value measured by each AC current sensor CT from the current distribution flowing through the feeder circuit described in FIGS. From the above, it was found that equation (5) can be obtained.
Here, the result obtained by calculating the parallel connection point passing current at the time of no load from any one of the formulas (1) to (5) from the current value measured by each AC current sensor CT, and the result actually measured Are almost equal.
In the case of parallel connection of different power sources on the down line in the no-load state in FIGS. 1 and 2, when there is no tie on the upper and lower lines and there is a tie, the parallel connection point passing current flows in the switching section (switching switches 111 and 113) ing.

As a result, currents of the same size and direction flow from the power source of substation A through the switching section to the power source of substation B, and the current of the same size direction also flows to the feeder line that is the return path. As can be seen from FIGS. 1 and 2, they flow via an alternating current sensor provided on the outer line side of each autotransformer.
Therefore, the current value measured by the alternating current sensor in the path of each current flowing through the switching section is calculated as the parallel connection point passing current flowing through the switching section by arithmetically calculating from the equations (1) to (5). can do.

<Calculation of parallel connection point passing currents I _{SWSS1 and} I _{SWSS2 in} a load (existing train) state>
FIG. 3 has the same configuration as FIG. 1 except that a train 200 exists between the intermediate section between the switching switches 111 and 113 and the rail 120D (that is, a train exists in the intermediate section). Show.
FIG. 4 shows the same configuration as FIG. 3 and shows a case where a train 200 exists between the trolley wire between the switching switches 111 and 113 and the rail 120D, but between the feeders 102D and 102U. Feed wire tie 102T, feed wire tie 104T between feed wires 104D and 104U, trolley wire tie 101T between trolley wires 101D and 101U, and trolley wire tie 100T between trolley wires 100D and 100U.
When there is a load between the trolley line between the switching switches 111 and 113 and the rail 120D, the parallel connection point passing current I _SWSS1 flowing through the switching switch 111 and the parallel connection point passing current flowing through the switching switch 113 Calculation with I _SWSS2 will be described.
(6), (7), (8), and (9), which will be described later, indicate that the upper and lower trolley lines and the upper and lower lines are the same regardless of whether the parallel connection of different power sources in the SP is performed on the upstream line or the downstream line. It can be used with or without tie wires.

In the feeder circuit of FIG. 3, in SS (or SP), both of the switching switches 111 and 113 provided between the trolley line 101D and the trolley line 100D of the down line are turned on, and the substation A and the substation B When the different power sources are connected, when the train 200 exists between the trolley wire between the switching switches 111 and 113 and the rail 120D, the detection unit 201 detects each of the AC current sensors CT11F and CT12F. The measured current values I _CT11F and I _CT12F are detected, and the detected current values I _CT11F and I _CT12F are _output to the parallel connection point passing current calculation unit 202.
Similarly, the detection unit 201 detects the measured current values I _CT13F and I _CT14F of the AC current sensors CT13F and CT14F, respectively, and detects the detected current values I _CT13F and I _CT14F to the parallel connection point passing current calculation unit 202. Output.

3 and 4, the current value I _CT11F is a current that flows to the AC current sensor CT11F when different power sources are connected in parallel in a state where a load exists between the trolley line and the rail.
3 and 4, the current value I _CT12F is a current that flows to the AC current sensor CT12F when different power sources are connected in parallel in a state where a load exists between the trolley line and the rail.
3 and 4, the current value I _CT13F is a current that flows through the AC current sensor CT13F when different power sources are connected in parallel in a state where a load exists between the trolley line and the rail.
In the _feeding circuit of FIGS. 3 and 4, the current value I _CT14F is a current that flows through the AC current sensor CT14F when a different power source is connected in parallel in a state where a load exists between the trolley line and the rail.

3 and 4, the parallel connection point passing current calculation unit 202 receives the input current values I _CT11F , I when the information that the train 200 exists in the intermediate section is input from the _outside . _The parallel connection point passage current I _SWSS1 and the parallel connection point passage current I _SWSS2 are respectively calculated by the following equations (6) and (7) from _CT12F , I _CT13F, and I _CT14F .
3 and 4, the parallel connection point passage current I _SWSS1 or the parallel connection point passage current I _SWSS2 includes a cross current (that is, a current passing between the switching switches 111 and 113). Further, I _SWSS1 and I _SWSS2 are positive (+) in the direction from each power source substation to the parallel connection point.

3 and 4, the parallel connection point passage current I _SWSS1 or the parallel connection point passage current I _SWSS2 can be obtained from the following equations (8) and (9).
In this case, the detection unit 201 detects the current values I _CT11F , I _CT12F , I _CT13F , I _CT14F , I _CT11T , I _CT12T , I _CT12T , ICT12T, ICT12T, ICT12T, ICT12T, ICT12T, ICT12T, ICT12T _CT13T and _ICT14T are detected, and the detected current values _ICT11F , _ICT12F , _ICT13F , _ICT14F , _ICT11T , _ICT12T , _ICT13T, and _ICT14T are _output to the parallel connection point passing current calculation unit 202.

3 and 4, the current value I _CT11T is a current that flows to the AC current sensor CT11T when different power sources are connected in parallel in a state where a load exists between the trolley line and the rail.
3 and 4, the current value I _CT12T is a current that flows through the AC current sensor CT12T when a different power source is connected in parallel in a state where a load exists between the trolley line and the rail.
3 and 4, the current value I _CT13T is a current that flows through the AC current sensor CT13T when different power sources are connected in parallel in a state where a load exists between the trolley line and the rail.
3 and 4, the current value I _CT14T is a current that flows to the AC current sensor CT14T when a different power source is connected in parallel in a state where a load exists between the trolley line and the rail.

3 and 4, the parallel connection point passing current calculation unit 202 has the input current values I _CT11F , I _CT12F , I _CT13F , I _CT14F , I _CT11T , I _CT12T , I _CT13T and I _{Based on CT14T} , the parallel connection point passing current I _SWSS1 and the parallel connection point passing current I _SWSS2 are calculated by the following equations (8) and (9), respectively.
Here, in FIGS. 3 and 4, the cross current, that is, the current distribution due to only the load in which the parallel connection point passing current I _SWO does not flow is shown, but in the case where the cross current is added (included), the load The current distribution in the case of only the cross current is superimposed on the current distribution of only the current. Therefore, I _SWSS1 and I _SWSS2 at this time are obtained as values including a cross current.

In FIG. 3, the current I _SWL1-1 is obtained by connecting different power sources in parallel in the down line in a state where a load exists between the trolley line and the rail in the down line, and between the up and down trolley lines and in the up and down line. This is the current that flows when there is no cross current from the substation A side to the connection point of the different power source when there is no trolley wire tie or feeder tie between the feeder wires (“substation A” → “Trolley wire 101D” → “switching switch 111” → “train 200” → “rail 120D” → “winding 11F of the autotransformer 11” → “feed wire 102D” → “substation A”).
In the state where a load exists between the trolley line and the rail in the down line, the current I _SWL3-1 is connected in parallel with different power sources in the down line, and between the trolley lines of the upper and lower lines and between the _feeders of the upper and lower lines. When there is no trolley wire tie or feeder tie, the current flows when there is no cross current from the substation B side to the different power source connection point (as a route, “substation B” → “trolley wire 100D” → “Switching switch 113” → “Train 200” → “Rail 120D” → “Winding 13F of the autotransformer 13” → “Feeding wire 104D” → “Substation B”).

The current I _1L1 in FIG. 3 is _obtained between the trolley lines on the upper and lower lines and between the feeder lines on the upper and lower lines when different power sources are connected in parallel on the down line in a state where a load exists between the trolley lines and the rails on the down line. When there is no trolley wire tie or feeder tie, the current flows directly to the switching switch 111 without passing through the AC current sensor CT (when there is no cross current).
The current I _3L1 in FIG. 3 _indicates that there is no trolley wire tie or feeder tie between the upper and lower trolley wires and between the upper and lower feeder wires in a state where a load exists between the trolley wire and the rail on the downstream line. In this case, the current flows directly to the switching switch 113 without the AC current sensor CT (when there is no cross current).
The current I _J1L1 in FIG. 3 is the trolley wire between the upper and lower trolley wires and between the upper and lower feeder wires when different power sources are connected in parallel on the down line in the state where a load exists between the trolley wire and the rail. If there is no tie and feeder tie and there is no cross current, “trolley wire 101D” → “switching switch 111” → “train 200” → “rail 120D” → “winding 11T of the autotransformer 11” → This is the circulating current flowing through the path of “trolley wire 101D”.
The current I _J3L1 in FIG. 3 is the trolley wire between the upper and lower trolley wires and between the upper and lower feeder wires when different power sources are connected in parallel on the down line in a state where a load exists between the trolley wire and the rail. When there is no tie and feeder tie and there is no cross current, “trolley wire 100D” → “switching switch 113” → “train 200” → “rail 120D” → “winding 13T of the autotransformer 13” → This is the circulating current flowing through the path of “trolley wire 100D”.
In addition, the above matters can be considered similarly in the uplink.

On the other hand, in FIG. 4, the current I _SWL1-2 is in a state where a load is present between the trolley line and the rail in the down line, and different power sources are connected in parallel in the down line, and between the trolley lines in the up and down lines, This is the current that flows from the substation A side to the connection point of the different power source when there is a trolley wire tie and a feeder tie between the feeders, and there is no cross current ("substation A"->"Trolley wire 101D"->"Switching switch 111"->"Train200"->"Rail120D"->"Winding 11F of auto-transformer 11"->"Feed wire 102D"->"SubstationA" “Substation A” → “trolley wire 101D” → “switching switch 111” → “train 200” → “rail 120D” → “rail 120U” → “winding 12F of the autotransformer 12” → “feed wire 102U” → Two systems with “Substation A”) .
In a state where a load exists between the trolley line and the rail in the down line, the current I _SWL3-2 is in a state where different power sources are connected in parallel in the down line, and between the trolley lines of the upper and lower lines and between the feeder lines of the down line This is the current that flows from the substation B side to the connection point of the different power source when there is a trolley wire tie and a feeder tie and there is no cross current (as a route, “substation B” → “trolley wire 100D” ->"Switching switch 113"->"Train200"->"Rail120D"->"Winding 13F of autotransformer 13"->"Feed wire 104D"->"SubstationB" and "Substation B"->""Trolley wire 100D"->"switch switch 113"->"train200"->"rail120D"->"rail120U"->"winding 14F of auto-transformer 14"->"wire104U"->"substationB" And two systems).

The current I _1L2 in FIG. 4 is _obtained when the load is present between the trolley line and the rail in the down line, and when different power sources are connected in parallel in the down line, between the trolley lines in the vertical line and between the feeder lines in the vertical line When there is a trolley wire tie and a feeder tie, respectively, the current flows directly to the switching switch 111 without passing through the alternating current sensor CT (when there is no cross current).
The current I _3L2 in FIG. 4 is obtained when the different power sources are connected in parallel in the down line with a load between the trolley line and the rail in the down line, and between the upper and lower line trolley lines and between the upper and lower line _feeders . When there is a trolley wire tie and a feeder tie, respectively, the current flows directly to the switching switch 113 without the alternating current sensor CT (when there is no cross current).
The current I _2L2 in FIG. 4 is obtained when the power supply is connected in parallel between the trolley wires on the down line and between the feeder lines on the up and down line when the different power sources are connected in parallel on the down line. When there is a trolley wire tie and a feeder tie, respectively, the current flows to the switching switch 111 via the trolley wire tie (when there is no cross current).
The current I _4L2 in FIG. 4 is obtained when the different power sources are connected in parallel on the down line in the state where the load exists between the down line trolley line and the rail, When there is a trolley wire tie and a feeder tie, respectively, the current flows to the switching switch 113 via the trolley wire tie (when there is no cross current).

The current I _J1L2 in FIG. 4 is _obtained between the trolley lines of the upper and lower lines and the feeder lines of the upper and lower lines when different power sources are connected in parallel in the down line in a state where a load exists between the trolley lines and the rails in the down line. If there is a trolley wire tie and a feeder tie, respectively, and there is no cross current, “trolley wire 101D” → “switching switch 111” → “train 200” → “rail 120D” → “winding of the single-turn transformer 11” This is the circulating current flowing through the path of “line 11T” → “trolley line 101D”.
The current I _J2L2 in FIG. 4 is obtained when the different power sources are connected in parallel on the down line when there is a load between the down line trolley line and the rail, If there is a trolley wire tie and a feeder tie, and there is no cross current, “trolley wire 101D” → “switching switch 111” → “train 200” → “rail 120D” → “rail 120U” → “one roll The circulating current flows through the path of winding 12T ”of transformer 12 →“ trolley wire tie 101T ”→“ trolley wire 101D ”.

The current I _J3L2 in FIG. 4 is obtained when the different power sources are connected in parallel on the down line in the state where the load exists between the trolley line on the down line and the rail, If there is a trolley wire tie and a feeder tie, respectively, and there is no cross current, “trolley wire 100D” → “switching switch 113” → “train 200” → “rail 120D” → “winding of auto-transformer 13” This is the circulating current flowing through the path of “line 13T” → “trolley line 100D”.
The current I _J4L2 in FIG. 4 is obtained when the different power sources are connected in parallel in the down line with a load between the trolley line and the rail in the down line, and between the trolley lines in the upper and lower lines and between the feeders in the upper and lower lines. If there is a trolley wire tie and a feeder tie, respectively, and there is no cross current, “trolley wire 100D” → “switching switch 113” → “train 200” → “rail 120D” → “rail 120U” → “one roll The circulating current flows through the path of winding 14T ”of transformer 14 →“ trolley wire tie 100T ”→“ trolley wire 100D ”.
In addition, the above matters can be considered similarly in the uplink.

Also, the current passing through the feeder circuit described in FIGS. 1 and 2 is superimposed on (superposed and synthesized) with FIGS. 3 and 4 to obtain the parallel connection point passing current in which the cross current and the load current are added. The formula (9) can be obtained from the above formula (6).
Here, the result obtained by calculating the parallel connection point passing current at the time of load from one of the formulas (6) to (9) from the current value measured by each AC current sensor CT, and the result of actual measurement Are almost equal.
3 and FIG. 4, when different power sources are connected in parallel on the down line in the state where a load exists between the trolley line and the rail, the switching section (the switching switch 111 And 113), a parallel connection point passing current flows.

As a result, currents of the same size and direction flow from the power source of substation A and substation B to the trolley wire passing through the switching section. Currents with the same direction flow, and they flow through existing AC current sensors provided on the outer line side of each autotransformer, as can be seen from FIGS. 3 and 4.
Therefore, in either case of the upper and lower lines, the current value measured by the existing AC current sensor in the path of each current flowing through the switching section in which different power sources are connected in parallel is calculated using the equations (6) to (9). By performing an arithmetic operation, it can be calculated as a parallel connection point passing current flowing through a switching section in which different power sources are connected in parallel. The calculated parallel connection point passing current includes the cross current and the load current (synthesized).

<Calculation of load current I _LOAD flowing in the train when the load is in a tie between upper and lower feeders and trolley lines>
When the train 200 exists, both the switching switches 111 and 113 are turned on, and the feeding current distribution at the time of parallel connection between different power sources and the equations (6) and (7), that is, the equations (6) and ( 7) By superimposing the currents passing through the switching switches 111 and 113 obtained from the equations, the load current I _LOAD flowing in the train 200 including the cross current can be obtained by the following equation (10). it can.
The parallel connection point passing current calculation unit 202 calculates the load current I _LOAD at the time of parallel connection of different power sources according to the following equation (10) based on the current values I _CT11F , I _CT12F , I _CT13F and I _CT14F input from the detection unit 201. calculate.

Also, the load current I _LOAD at the time of parallel connection of different power sources can be calculated by the following equation (11) as in the above equation (10).
That is, when there is a train 200 (load) between the trolley line and the rail, both the switching switches 111 and 113 are turned on, and from the feeding current distribution at the time of parallel connection between different power sources, as in the equation (10) , (8) and (9), that is, the train 200 including the cross current obtained by superimposing the currents passing through the switching switches 111 and 113 obtained from the expressions (8) and (9), respectively. The load current I _LOAD that flows through can be obtained by the following equation (11). Similarly, when both of the switching switches 112 and 114 on the up line are in the on state, the expression (11) can be similarly used. In other words, the load current I _LOAD flowing in the train 200 including the cross current can be calculated by the equation (11) in the case of parallel connection of different power sources for both the upstream and downstream lines.

The abnormal current detection unit 203 compares the load current I _LOAD calculated by the parallel connection point passing current calculation unit 202 with a threshold current for a preset load current, and the calculated load current I _LOAD is a threshold current for the load current. If it exceeds, it is output as a judgment result such as an accident because an abnormal current is flowing.

  As described above, according to the present embodiment, when two power switches of different substations A and B are connected in parallel in the intermediate section by turning on two switching switches in parallel in the switching section of the trolley line, The existing AC current that is already provided on the outside line side of the autotransformer without using a new CT for measuring the parallel connection point passing current that flows through the parallel connection point of the different power source. Sensor CT makes it possible to calculate and detect the current value of the parallel connection point passing current flowing in the switching switch, and the parallel connection point passing current can be easily calculated without providing new equipment. Can be easily applied to existing equipment.

  Further, according to the present embodiment, by predicting the parallel connection point passing current flowing in the normal state or the load current flowing in the load, the threshold current value is set corresponding to the predicted plurality of current values. Thus, it is possible to easily determine the presence or absence of an accident at no load (a state where no train is present) or at a load (a state where a train is present).

It is a conceptual diagram which shows the structural example of the feeder circuit (at the time of no load, no tie) by one Embodiment of this invention. It is a conceptual diagram which shows the structural example of the feeder circuit (at the time of no load, with a tie) by one Embodiment of this invention. It is a conceptual diagram which shows the structural example of the feeder circuit (at the time of load, without a tie) by one Embodiment of this invention. It is a conceptual diagram which shows the structural example of the feeder circuit (at the time of load, with a tie) by one Embodiment of this invention. It is a conceptual diagram explaining the switching section of a feeder section.

Explanation of symbols

11, 12, 13, 14... Transformer 100, 100 D, 100 U, 101, 101 D, 101 U... Trolley wire 102, 102 D, 102 U, 104, 104 D, 104 U. 120D, 120U ... Rail 200 ... Different power source parallel connection point passing current calculation device unit 201 ... Detection unit 202 ... Parallel connection point passing current calculation unit 203 ... Abnormal current detection unit A, B ... Substation CT11F, CT11T, CT12F, CT12T ... AC sensor CT13F, CT13T, CT14F, CT14T ... AC sensor

Claims (11)

A power supply A trolley wire of an A substation (ASS) of an AC electric railway using an AT AC power feeding system and a power supply B trolley wire of a B substation (BSS) different from the A substation (ASS) In a switching section provided in a power distribution section (SP), a first section for connecting or releasing the trolley line of the power source A and the intermediate section with respect to the intermediate section provided insulated from the trolley line. Different power supply parallel connection for detecting a current passing through a parallel connection point when a switching switch and a second switching switch for connecting or opening the trolley wire of the power supply B and the intermediate section are connected in parallel A point passing current calculation device,
In the vicinity of each of the first and second switching switches, the current drawn from the rail to the feeder by the autotransformer (AT) installed between the feeder and the trolley wire with the rail as a neutral point. A measuring unit that measures the current value of the current induced on the trolley line side by an existing AC current sensor provided on the outer line side of the autotransformer;
Parallel connection point passing current calculation for calculating the current flowing through the A transformer side autotransformer and the B transformer side autotransformer using an arithmetic expression to obtain the parallel connection point passing current And a different power source parallel connection point passing current calculation device.   The arithmetic expression is an arithmetic expression representing a combination of measurement currents of alternating current sensors corresponding to each autotransformer, which has a current value that matches a current flowing through the parallel connection point. Item 4. The parallel power connection point passing current calculation device according to item 1. When there is no train as a load between the first and second switching switches,
The parallel connection point passing current calculation unit performs an arithmetic operation in consideration of the polarity of the current value flowing through the A transformer-side autotransformer and the B transformer-side autotransformer. 3. A different power source parallel connection point passing current calculation device according to claim 1, wherein a passing current is obtained. An upstream line and a downstream line exist between the A substation and the B substation, and a feeder tie for connecting the upstream and downstream feeders, and a trolley line for the upstream and downstream lines are connected. If a trolley wire tie exists,
The parallel connection point passing current calculation unit performs arithmetic operations in consideration of the polarity of the current value flowing through the A-transformer-side autotransformer and the B-transformer-side autotransformer of each of the upstream and downstream lines. 4. The different power source parallel connection point passage current calculation device according to claim 3, wherein the parallel connection point passage current to be calculated is obtained. When there is a train as a load between the first and second switching switches,
The parallel connection point passing current calculation unit performs an arithmetic operation in consideration of the polarity of the current value flowing through the A transformer-side autotransformer and the B transformer-side autotransformer. 3. A different power source parallel connection point passing current calculation device according to claim 1, wherein a passing current is obtained. An upstream line and a downstream line exist between the A substation and the B substation, and a feeder tie for connecting the upstream and downstream feeders, and a trolley line for the upstream and downstream lines are connected. If a trolley wire tie exists,
The parallel connection point passing current calculation unit performs arithmetic operations in consideration of the polarity of the current value flowing through the A-transformer-side autotransformer and the B-transformer-side autotransformer of each of the upstream and downstream lines. 6. The different power source parallel connection point passage current calculation device according to claim 5, wherein the parallel connection point passage current to be calculated is calculated.   A threshold current indicating an abnormal current value is set in advance, and further includes an abnormal current detection unit that detects whether or not the parallel connection point passing current exceeds the threshold current. The different power source parallel connection point passing current calculation device according to any one of claims 6 to 6. A power supply A trolley wire of an A substation (ASS) of an AC electric railway using an AT AC power feeding system and a power supply B trolley wire of a B substation (BSS) different from the A substation (ASS) In a switching section provided in a power distribution section (SP), for connecting or opening the trolley wire of the power source A and the intermediate section to an intermediate section provided insulated from the two trolley wires A different power source for detecting a parallel connection point passing current when a first switching switch and a second switching switch for connecting or opening the trolley wire of the power source B and the intermediate section are connected in parallel. A parallel connection point passing current calculation method,
In the vicinity of each of the first and second switching switches, the measuring unit is sucked up from the rail to the feeder by a single transformer (AT) installed between the feeder and the trolley wire with the rail as a neutral point. A measurement process in which the current and the current value of the current induced on the trolley line side are measured by an existing AC current sensor provided on the outer line side of the autotransformer,
A parallel connection point passing current calculation unit calculates the measured value of the current flowing through the A transformer-side autotransformer and the B transformer-side autotransformer to obtain the parallel connection point passing current. A parallel connection point passing current calculation process. A parallel connection point passing current calculation method comprising:   The arithmetic expression is an arithmetic expression representing a combination of measurement currents of alternating current sensors corresponding to each autotransformer, which has a current value that matches a current flowing through the parallel connection point. Item 9. The method for calculating the current passing through the different power supply parallel connection points according to Item 8. When there is no train as a load between the first and second switching switches,
The parallel connection point passing current calculation unit performs an arithmetic operation in consideration of the polarity of the current value flowing through the A transformer-side autotransformer and the B transformer-side autotransformer. The method for calculating a passing current of different power source parallel connection points according to claim 8 or 9, wherein a passing current is obtained. When there is a train as a load between the first and second switching switches,
The parallel connection point passing current calculation unit performs an arithmetic operation in consideration of the polarity of the current value flowing through the A transformer-side autotransformer and the B transformer-side autotransformer. The method for calculating a passing current of different power source parallel connection points according to claim 8 or 9, wherein a passing current is obtained.

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