JP3157691B2 - Feeding equipment protection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects the occurrence of an accident current, such as an overcurrent or a reverse current, caused by a short-circuit accident of a feeder line or other equipment in a feeder facility such as a DC substation for electric railways. The present invention relates to a feeder facility protection device for protecting the feeder facility by interrupting the accident current.

[0002]

2. Description of the Related Art Conventionally, in a DC substation which is provided in a DC electrified section of a railway and supplies DC power for operation to a train via a feeder line, a DC substation provided for each area and each upper and lower line has a predetermined length. The feeder circuit for distributing the DC power has been configured, for example, as shown in FIG.

That is, the feeder circuit is connected to a plurality of supply lines SC for supplying DC power of a predetermined voltage output from the transformation circuit 80 to the DC bus DB, and one end is connected to the DC bus DB.
A plurality of DC lines DC each having the other end connected to the electric wire L via a disconnector 82, and one end connected to a DC bus DB,
The other end is composed of a protection line BC connected to the common bus CB. Each of the lines SC, DC, and BC opens a contact and shuts off the current when a large current exceeding a predetermined value flows through the DC bus DB due to an accident or the like and when an open command is input from the outside. It is connected via a circuit breaker 84. A reverse current relay 86 for detecting a reverse current of the current is connected to the supply line SC, and a fault selection device 88 for detecting a short circuit of the feeder line L is connected to each DC line DC and the backup line BC.
And a DC ammeter 90 with a residual indicator for detecting the current value flowing through each line DC and BC and its peak value,
Further, an arc detector 92 is provided in the vicinity of each circuit breaker 84 to determine whether the current has been reliably cut off by detecting an arc generated when the contacts of the circuit breaker 84 are opened.

The arc detector 92 is constituted by a photovoltaic cell which detects ultraviolet rays emitted when an arc is generated and outputs a predetermined voltage according to the intensity of the ultraviolet rays. Also,
The reverse current relay 86, the fault selection device 88, and the DC ammeter 90 with a residual indicator are respectively connected to the respective lines SC and D via current transformers.
C and BC. Further, the common bus BC is connected to each feeder wire L via a disconnector 94, and a lightning arrester 96 is provided on the feeder wire L side of each of the disconnectors 82 and 94.

[0005] The backflow relay 86 and the fault selection device 8
8. When the arc detector 92 detects an abnormality, each of them individually outputs an open command to a predetermined circuit breaker 84 to open the circuit breaker 84, thereby confirming that an abnormal current continues to flow. To protect the equipment.

[0006]

By the way, the circuit breaker 84
Is usually housed in a predetermined circuit breaker room because an arc generated when the contact is opened may cause a fire or the like if it comes into contact with another object.
2 was also installed in this circuit breaker room. For this reason, when the arc detector 92 is checked, it is necessary to enter the breaker room, and it is dangerous to enter the breaker room in an operation state in which a high voltage is applied. There was a problem that it was very troublesome.

Further, since the photovoltaic cell constituting the arc detector 92 has directivity, it is necessary to adjust the mounting position and the mounting angle with high accuracy, and the output deteriorates due to aging and the output is reduced. To ensure detection capability,
It is necessary to perform an operation test periodically to make adjustments, and there is a problem that installation and maintenance are troublesome.

Further, the backflow relay 86 and the fault selection device 8
8. Since the arc detectors 92 individually perform abnormality detection, there is a problem that a ground fault accident of the DC bus DB cannot be detected. That is, when the DC bus DB is grounded (so-called ground fault) via a certain amount of resistance for some reason, and an accident current of about load current flows out of the DC bus DB,
Since a current determined to be abnormal does not flow through each of the lines SC, DC, and BC connected to the DC bus DB, each of the lines SC, DC, and BC independently detects an abnormality. In other words, it is impossible to distinguish whether the current is a load current or an accident current, and a ground fault of the DC bus DB cannot be detected.

The present invention has been made to solve the above problems.
An object of the present invention is to provide a protection device for feeding equipment that can reliably detect occurrence of an accident current and that can easily perform maintenance and operate stably.

[0010]

According to a first aspect of the present invention, there is provided an electric vehicle, comprising: a plurality of feeder wires provided for supplying DC power used for driving a train; a plurality of direct current lines that are a DC bus which one end of the DC line of the plurality of respective connecting, DC to the DC bus
At least one supply line for supplying power, provided for each of the DC line and the supply line, the DC line or supply
It has a contact for interrupting the current flowing in the line, and when a current of a predetermined value or more flows in the DC line or the supply line ,
Or, a breaking means for opening the contact when an open command is input from the outside, and a current provided for each of the DC line and the supply line for detecting a current value and a current direction flowing through the DC line or the supply line Detecting means for detecting an abnormality in the current flowing into and out of the DC bus based on the current value and the current direction detected by the current detecting means; Calculating means for outputting the DC bus at least
In the power supply equipment protection device for determining an abnormal current caused by a ground fault , the arithmetic unit is connected to the supply line.
The current detected by the current detecting means is in the power supply direction.
The power supply direction,
Backflow judging means to judge that there is an abnormality when flowing to
A step is provided.

[0011]

[0012]

[0013]

[0014]

In the protection device for feeding equipment according to the first aspect of the present invention, a DC line is provided.
And the current detecting means provided for each supply line is a DC line.
Alternatively , the current value and current direction flowing through the supply line are detected,
The calculating means determines an abnormality of the current flowing into and out of the DC bus based on the current value and the current direction detected by the current detecting means, and when it is determined that there is an abnormality, issues an opening command to a predetermined breaking means. The current is interrupted by outputting the output and causing the interrupting means to open the contact. For example, in the calculation means, the detection result of the current detection means is used.
The total current flowing into the DC bus and the DC bus
The difference from the total current value flowing out of the line is calculated, and the calculated value
It is determined whether the absolute value is equal to or greater than a predetermined value, and the calculated value is determined to be a predetermined value.
Above, if the current flowing into and out of the DC bus is abnormal
And the DC bus is considered to be grounded in this case.
Refuse.

As described above, by detecting an abnormality and opening the shut-off means, it is possible to prevent an abnormal current from continuously flowing through the feeding equipment, and to prevent the feeding equipment from being subjected to an accident current or the like. Can be protected from abnormal current. Further, when determining the abnormality, it is sufficient that the current flowing through the DC line can be detected. For example, the current can be easily detected by a current transformer or the like. In addition, since the current transformer hardly changes over time, stable detection can be performed and maintenance is easy.

[0016]

[0017]

[0018]

[0019]

[0020]

In particular, in the present invention, a backflow
Determining means for determining whether or not the current detected by the current detecting means of the supply line is flowing in the power supply direction, and determining whether the current is flowing in the direction opposite to the power supply direction. Then, it is determined that there is an abnormality, and in this case, it is determined that the current of the supply line is flowing backward.

Therefore, according to the present invention, the reverse flow of the current in the supply line can be detected without providing a reverse flow relay. The current detecting means for detecting the current of the supply line includes:
Since it can also be used for detecting a ground fault of the DC bus, detection of interruption of the interruption means, etc., if a current detection means is already provided for such a purpose, simply provide a backflow judgment means in the arithmetic means. A function similar to that of a reverse flow relay can be easily realized only by using the above.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an explanatory diagram illustrating a schematic configuration of feeding system equipment provided to supply operating DC power to a train in a DC electrified section of a railway.

As shown in FIG. 2, the feeding system equipment in the DC electrification section includes a DC substation 2 and a DC substation 2 which receive AC power from the outside, convert the power into predetermined DC power, and supply the DC power to the power line L.
In the case where the intermediate feeder voltage cannot be secured to a predetermined value or more with the DC substation 2 alone, or when the feeder L is to be separated, the feeder section 4 is provided in the same manner as the feeder section 4. A feeder tie post 6 is provided to reduce the voltage drop of the feeder wire L.

The feeder line L is provided for each of the ascending and descending lines, and a voltage is applied so that the feeder line L serves as a positive electrode and the rail R serves as a negative electrode. Among them, DC substation 2
As shown in FIG. 1, a power receiving circuit 8 for receiving AC power of an extra high voltage (for example, 22 KV, 66 KV, 77 KV, etc.) from a power transmission line (not shown), and a power receiving circuit 8 for receiving AC power received by the power receiving circuit 8. A transforming circuit 10 which takes in via a bus RB, transforms, rectifies and converts it into a predetermined DC power (in this embodiment, 1500 V), and an AC power via a receiving bus RB, and emits a signal and a light / power of each station. -Voltage distribution circuit 1 that supplies a high-voltage power supply (for example, 6 KV) as a power supply for
2, a feeder circuit 14 that supplies DC power obtained as an output of the transformation circuit 10 to each feeder line L, and a smoothing DC output supplied from the transformer circuit 10 to the feeder line via the feeder circuit 14. Smoothing circuit 16, CPU, ROM, RA
A known microcomputer composed mainly of M is used to determine an abnormality based on a current flowing through each part of the feeding circuit 14 and an open / close state of a circuit breaker 36 described later provided in the feeding circuit 14, and the abnormality is determined. If there is a predetermined breaker 36
And a control device 18 for executing various processes such as outputting an opening command for releasing the camera.

The transformation circuit 10 includes a feeder circuit 14
A plurality of transformers 10 are provided depending on the amount of power supplied to the power supply or for the purpose of protection in the event of an accident. 22, a transformer 24 for transforming the received extra high voltage AC power to a predetermined voltage (1200V in this embodiment), a silicon rectifier 26 for rectifying the output of the transformer 24 and converting the output to a predetermined DC (1500V), AC interruption A short-circuit selection relay 30, an overcurrent relay 32, and the like, which are connected between the transformer 20 and the transformer 24 via a current transformer 28 and detect a short-circuit or ground-fault accident from a change in current flowing through the transformation circuit 10. Have been.

The feeder circuit 14 is connected to a supply line S that supplies the DC power output from the transformer circuit 10 to the DC bus DB.
C, one end is connected to the DC bus DB, and the other end is the disconnector 3
4 and a total of four DC lines DC provided for each direction and upper and lower lines, and a spare line BC having one end connected to the DC bus DB and the other end connected to the shared bus CB. Consists of The supply line SC, the DC line DC, and the backup line BC are connected to a DC bus via a circuit breaker 36 that opens a contact and cuts off the current when a predetermined current or more flows or an open command is input from the outside. A current transformer 38 is connected to DB and detects a current flowing in each of the lines SC and DC. Each current transformer 38
Is input to the control device 18 via a signal line. A signal line for notifying the controller 18 of the open / close state of the circuit breaker 36 and an opening command for instructing the opening of the contacts of the circuit breaker 36 are provided between each circuit breaker 36 and the controller 18. A signal line for notifying the circuit breaker 36 from the signal line 18 is provided. Further, a DC line DC and a backup line B
A failure selecting device 40 for detecting a short circuit or the like of the feeder line L is connected to C via a current transformer 42. The common bus CB is connected to each feeder line L via a disconnector 44, and an abnormal voltage due to lightning or the like is supplied to the feeder line L side of the disconnectors 34 and 44 via a feeder line L. Lightning arresters 46 for preventing entry into the place 2 are respectively connected.

The common bus CB is connected to the power line L via the backup line BC when the circuit breaker 36 or the like of each DC line DC breaks down or when power transmission is stopped for inspection of the DC line DC. This is provided so that the supply of power can be continued. Next, FIG. 3 is an explanatory diagram showing a schematic configuration of only a portion related to opening and closing of a contact related to the present invention in the circuit breaker 36.

As shown in FIG. 3, the circuit breaker 36 has a fixed contact 48 connected to the main current output side and a fulcrum P connected to the main current input side and contacting the fixed contact 48 at a predetermined position. A movable contact 50 formed to be rotatable around an axis;
An open spring 52 for urging the movable contact 50 in a direction to separate the movable contact 50 from the fixed contact 48; and an open spring 52 connected to the movable contact 50 via an operation punch 54, which operates according to opening and closing of the contact by the fixed contact 48 and the movable contact 50, An auxiliary contact 56 that outputs a signal for notifying the control device 18 of the open / closed state of the contact;
An electromagnet 58 that rotates the movable contact 50 by attracting the armature 50a attached to the movable contact 50 and contacts the fixed contact 48, and a holding coil 60 that generates a magnetic flux that causes the electromagnet 58 to attract the armature 50a. A holding current control circuit 62 that supplies a predetermined holding current to the holding coil 60 and stops the output of the holding current when an opening command is input from the control device 18; A trip coil 64 for causing the electromagnet 58 to generate a magnetic flux in a direction opposite to a magnetic flux generated by the holding coil 60 in accordance with the current, and a trip coil 64 connected in parallel, having a predetermined inductance, An induction shunt 66 is provided to increase the ratio of current shunting to the tripping coil 64 in the case of a sudden change.

In the circuit breaker 36 configured as described above, a predetermined current flows through the holding coil 60 and the armature 5
By attracting Oa, the contact between the fixed contact 48 and the movable contact 50 is closed, the main current becomes larger than a predetermined value, and when a current larger than a predetermined value flows through the trip coil 64,
By canceling the magnetic flux by the holding coil 60,
The attractive force of the electromagnet 58 is canceled, and the armature 50a is pulled by the opening spring 52, and the contact is opened. If the fluctuation of the main current is relatively gentle, a current inversely proportional to the resistance flows through the tripping coil 64 and the induction shunt 66, so that the above-mentioned contact is opened according to the main current. Although the operation is performed, when the main current changes abruptly, the ratio of the main current shunted to the trip coil 64 increases due to the influence of the inductance of the induction shunt 66. Even if there is, the operation of opening the above-mentioned contact is activated.

When the contact is opened, the movable contact 50
By operating the auxiliary contact 56 by pressing the operation punch 54, an open notification signal for notifying the open state is output.
Further, an opening command is input from the control device 18 to the holding current control circuit 62, and the holding current control circuit 62
When the supply of current to the electromagnet 58 is stopped, the contact force is released because the holding force of the electromagnet 58 disappears regardless of the state of the trip coil 64.

In the DC substation 2 configured as described above, the extra high-voltage AC power received by the power receiving circuit 8 is converted into a predetermined DC power by the transformation circuit 10,
The power is supplied to the DC bus DB via the supply line SC of the feeder circuit 14, and further supplied from the DC bus DB to each feeder line L via the DC line DC.

At this time, the control device 18 controls each supply line S
C and the respective current transformers 38 connected to the DC line DC to detect the direction of the current and its current value.
6, the open / closed state of the circuit breaker 36 is detected. Based on the detection result, an abnormality determination is made. If it is determined that there is an abnormality, an open command is output to a predetermined circuit breaker 36 to cause an accident. The equipment in the DC substation 2 is protected by interrupting the current.

Here, the abnormality detection processing executed by the control device 18, that is, the ground fault detection processing, the backflow detection processing, and the cutoff impossible detection processing will be described in detail. Note that the control device 18 performs an initialization process when the power is turned on, and initializes the values of flags Fb, Fj, and Fg, which will be described later, to 0, and then periodically (in this embodiment, every 1 msec period). ) Is executed for each abnormality detection process.

Each supply line SC and DC line DC
The current transformer 38 provided in is configured to read the current value assuming that the current flowing into the DC bus DB is + (plus) and the current flowing out of the DC bus DB is-(minus). First, a ground fault detection process for detecting a case where the DC bus DB is grounded with a predetermined resistance value (so-called ground fault) will be described with reference to the flowchart shown in FIG.

As shown in FIG. 4, when the present process is executed, first, in S110, the current value I is read from all current transformers 38 provided in each supply line SC and DC line DC, and the process is continued. In S120, all the read current values are added to calculate a total current value Ib, and the process proceeds to S130.

In S130, it is determined whether or not the total current value Ib is equal to or more than a predetermined current value (1000 A in this embodiment).
The process proceeds to S40, where the flag Fb is set to 0 and the process is terminated. If the total current value Ib is equal to or more than 1000 A, the process proceeds to S1.
Move to 50.

In S150, it is determined whether or not the total current value Ib is equal to or greater than a predetermined current value (in this embodiment, 5000A).
0, and the set time Tb is set to a predetermined time (1 in this embodiment).
0 msec), the process proceeds to S180, and the total current value I
If b is smaller than 5000 A, the flow shifts to S 170 to set the ratio between the predetermined current 5000 A and the total current
After setting the value obtained by adding msec as the set time Tb, S1
Go to 80.

In S180, it is determined whether or not the flag Fb is set to 1. If the flag Fb is set to 1, the process directly proceeds to S200 and the flag Fb is set to 1
If not, the process proceeds to S190, sets the flag Fb to 1, starts the timer tb, and then proceeds to S200.

In S200, it is determined whether or not the value of the timer tb is equal to or longer than the set time Tb. If the value of the timer tb is smaller than the set time Tb, the process is terminated, and the value of the timer tb is set to the set time. If Tb or more, the process proceeds to S210. In S210, after outputting an open command to all the circuit breakers 36, the flag Fb is set to 0, the timer Tb is stopped, and this processing is ended.

As described above, in the ground fault detection processing, the total current value Ib of the current flowing into and out of the DC bus DB becomes abnormal when the current of the predetermined current (1000 A) or more continuously flows for the predetermined time or more. It is determined that there is, and the larger the current, the sooner it is determined that there is an abnormality. That is, when a current corresponding to the area shown by hatching in FIG. 5 flows, it is determined that there is an abnormality. If the total current value Ib is smaller than 1000 A or the duration does not reach 10 msec, the abnormality is determined. Is not determined, and when the total current value Ib is 1000 A, 50
If the current continuously flows for msec or more, it is determined that the current is abnormal, and the duration required until it is determined that the current is abnormal is short in inverse proportion to the increase of the total current value Ib. Is determined to be abnormal when flowing.

Normally, the sum of the current values flowing into the DC bus DB from the supply line SC and the DC line DC from the DC bus DB
Is approximately the same as the sum of the current values flowing through
The total current value Ib calculated in this process must be approximately 0 A. However, when a ground fault occurs, the current values flowing in and out do not become the same, so that the total current value Ib becomes 0 A. Therefore, a ground fault can be detected by this method.

Next, a backflow detecting process for detecting a case where a current equal to or more than a predetermined current flows in a reverse direction in a line (supply line SC in this embodiment) in which a current should flow in one direction is shown in FIG.
This will be described along the flowchart shown in FIG. This processing is executed for each supply line SC.

As shown in FIG. 6, when the present process is executed, first, in step 310, the current value Ig is supplied from the current transformer 38 provided on the supply line SC to be processed.
And the process proceeds to S320. In S320, the read current value Ig is a predetermined current value (−1000 in this embodiment).
A) Whether or not the absolute value is 100 or less in the direction of flowing out of the DC bus DB (backflow direction of the supply line SC)
It is determined whether or not a current of 0 A or more flows. If the current value Ig is larger than -1000 A, that is, whether the current flows in the direction of flowing into the DC bus DB (forward direction) or is smaller than 1000 A even if it flows in the reverse direction. For example, the process proceeds to S330, the flag Fg is set to 0, and the present process is terminated.
Is -1000 A or less, that is, 100
If a current of 0 A or more has flowed, the flow shifts to S340.

In S340, it is determined whether or not the current value Ig is equal to or less than a predetermined current value (-5000A in this embodiment), that is, the absolute value of the current value is 5000A in the reverse flow direction of the supply line SC.
It is determined whether or not the above current has flowed, and the current value Ig becomes −5.
If the current is equal to or less than 000 A, that is, if a current of 5000 A or more flows in the reverse flow direction, the process proceeds to S350, where the set time Tg is set to a predetermined time (10 msec in this embodiment), and then proceeds to S370, where the current value Ig is Is larger than -5000A, that is, if a current whose absolute value is 1000A or more and smaller than 5000A flows in the reverse flow direction, S
The flow shifts to 360, where a value obtained by adding a predetermined time 10 msec to the ratio of the absolute value 5000A of the predetermined current and the absolute value | Ig | of the read current value as the set time Tg is set, and then the flow proceeds to S370.

In S370, it is determined whether or not the flag Fg is set to 1. If the flag Fg is set to 1, the process directly proceeds to S390, and the flag Fg is set to 1
If not, the process proceeds to S380, where the flag Fg is set to 1 and the timer tg is started. Then, the process proceeds to S390.

In S390, it is determined whether or not the value of the timer tg is equal to or longer than the set time Tg. If the value of the timer tg is smaller than the set time Tg, the process is terminated as it is, and the value of the timer tg is set to the set time Tg. If Tg or more, the process proceeds to S400. In S400, after outputting an open command to all the circuit breakers 36, the flag Fg is set to 0, the timer Tg is stopped, and the present process ends.

That is, in the backflow detection processing, it is determined that an abnormality occurs when a current of a predetermined current (1000 A in the reverse flow direction) or more flows through the supply line SC for a predetermined time or more. Accordingly, the larger the current is, the sooner it is determined that there is an abnormality. In FIG. 5, the area determined to be abnormal is the same as the case where the total current value Ib is replaced with the current value Ig and the value is made negative.

Next, the interruption impossible detection processing for detecting the case where the current continues to flow even though the circuit breaker 36 is open will be described with reference to the flowchart shown in FIG. This process is executed for each of the lines SC, DC, and BC. As shown in FIG. 7, when this process is executed, first, in S410, the auxiliary contact 56 of the circuit breaker 36 provided in the line SC or DC, BC to be processed.
The switching state Pj of the circuit breaker 36, which is the output of
At 420, it is determined whether or not the circuit breaker 36 is in the open state.
The current value Ij is read via the.

In the following S440, the absolute value | Ij | of the read current value is equal to the predetermined current (1000 A in this embodiment).
It is determined whether the current is equal to or more than the predetermined current.
Move to If it is determined in S440 that the absolute value | Ij | of the read current value is smaller than 1000 A, or if it is determined in S420 that the circuit breaker 36 is not in the open state, the process proceeds to S490 and a flag is set. After setting Fj to 0, this processing ends.

In step S450, it is determined whether or not the flag Fj is set to 1. If the flag Fj is set to 1, the process proceeds to step S470. If the flag Fj is not set to 1, the process proceeds to step S470.
460, the flag Fj is set to 1 and the timer t
After starting j, the flow shifts to S470.

In S470, it is determined whether a predetermined time (100 msec in this embodiment) has elapsed since the start of the timer tj, and if the predetermined time has not elapsed,
When this processing is completed and the predetermined time has elapsed,
The process moves to S480. In S480, the circuit breaker 36 connected to the line SC or DC or BC targeted for this processing
After outputting an open command to all the circuit breakers 36 other than the above, the flag Fj is set to 0, the timer Tj is stopped, and the present process is terminated.

That is, although the circuit breaker 36 is activated for some reason, and the opening of the circuit breaker 36 is detected by the auxiliary contact 56, a current of a predetermined value (1000 A) or more is supplied for a predetermined time (100 msec) or more. If it continues to flow, breaker 3
No. 6 has judged that it cannot be shut off.

As a cause of such interruption failure, for example, there is a case where an arc generated between the contacts does not disappear when the circuit breaker 36 is opened. In order to detect this, the conventional device is provided with an arc detector 92. However, the same function can be realized by this processing.

As described above, in the DC / DC substation 2, the current transformers 38 and the circuit breakers 36 are connected to the respective supply lines SC and DC lines DC.
Is provided with an auxiliary contact 56, and the control device 18
Based on the current value detected by the current transformer 38 and the auxiliary contact 56, the inflow / outflow direction thereof, and the open / close state of the circuit breaker 36, various abnormality detection processes such as a ground fault detection process, a backflow detection process, and a disconnection impossible detection process are performed. Is going.

That is, without using the backflow relay 86 and the arc detector 92 provided in the conventional apparatus, the backflow detection processing and the cut-off impossible detection processing perform the reverse flow of the current in the supply line SC and the respective lines SC and DC. , BC can be detected.

Further, since the current values in the respective lines SC, DC, and BC are collected and controlled by the control device 18, a processing program for detecting the maximum value of the current for each of the lines SC, DC, and BC is provided. If a memory for storing the maximum value detected by the processing program and a display device capable of displaying the maximum value stored in the memory as necessary are prepared, the DC current with a residual pointer provided in the conventional device can be provided. The maximum value of the current can be recorded without requiring the total 90. In addition, since the data can be read and the values can be initialized without going to the site where the DC current meter with residual pointer 90 is attached as in the conventional device, the inspection can be easily performed.

As described above, according to the present embodiment, the backflow relay 86, the arc detector 92, the DC ammeter 90 with a residual pointer, and the like can be omitted as compared with the conventional apparatus, so that the entire equipment can be downsized. In addition to this, the power consumed by these devices is reduced, so that the power consumption of the entire equipment can be reduced.

Further, the current transformer 38 for detecting the current value and the current direction of each line SC, DC, BC can be attached to an arbitrary position unlike the conventional arc detector 92 and the like. It can be arranged in a relatively safe position, and requires less precision in mounting and adjustment than the arc detector 92, and there is almost no aging, so that mounting and maintenance are easy. In addition, stable functions can be realized.

Further, according to the present embodiment, each line SC, D
The current values of C and BC are collected by the control device 18 and controlled collectively, so that the control device 18 can easily calculate and judge these current values. According to this, it is possible to detect a ground fault of the DC bus DB that cannot be detected by the conventional device.

That is, when a fault current of the same level as the load current flows due to the ground fault of the DC bus DB, the conventional device detects the magnitude of the current for each line.
Although it is impossible to distinguish between the fault current and the load current, according to the present embodiment, each of the lines SC, DC
By calculating the sum of the current values flowing in and out of the DC bus DB normally through the DC bus, if there is a current flowing in and out of a path other than the normal path, the total current value Ib greatly deviates from 0A. It is possible to detect a collision accident.

Further, since the control device 18 monitors the current flowing through each line, monitors the contacts of the circuit breaker 36, and controls the opening and closing of the circuit breaker 36, a program for confirming the operation of each part of the equipment based on these. If the device is prepared, inspection of the equipment can be automatically performed, so that labor for maintenance can be saved.

Next, the feeding section 4 and the feeding tie post 6 will be described. As shown in FIG. 8, the feeder section 4 includes a feeder circuit 68 and a controller 70. The feeder circuit 68 is the same as the feeder circuit 14 of the DC substation 2 except that the supply line SC is omitted. The control device 70 has the same configuration, and the current value and the current direction of each DC circuit DC and the backup circuit BC, and the breaker 36
The open / close state of the circuit breaker 36 is detected through the auxiliary contact 56 of this embodiment.
Output of an opening command for. The control device 70
, A ground fault detection process and a cut-off impossible detection process for the DC line DC and the backup line BC are executed.

Next, as shown in FIG. 9, the feeder tie post 6 includes a feeder circuit 72 and a controller 74. The feeder circuit 72 separates the feeder circuit 72 from each feeder wire L. It has two disconnectors 34 to be disconnected and a circuit breaker 36a provided between the two disconnectors 34. Further, between the circuit breaker 36a and each disconnector 34, the DC substation 2 Similarly to the DC line SC of the power distribution section 4, the current transformer 38 for detecting the current value and the direction of the current, the failure selecting device 40a connected via the current transformer 42, and the abnormality via the feeder line L Lightning arresters 46 for preventing voltage from entering the feeding tie post 6 are connected respectively.

It should be noted that the failure selecting device 40a operates as follows:
What is called a shape is used, not only the change in current,
Voltage changes are also detected to detect short circuits, ground faults, and other accidents. For this reason, a DC transformer 76 is connected to one side of the circuit breaker 36a, and the output is input to each of the failure selecting devices 40a. In the feeder tie post 6, when the feeder wire L is short-circuited, an accident current flows in either direction depending on the short-circuit location.
Since only one a is provided, the circuit breaker 36a
Instead of the unidirectional type used in the DC substation 2 and the feeder section 4, a bidirectional type capable of blocking fault currents in any direction is used.

The control device 74 controls the feeder section 4
Similarly to the above, a ground fault detection process and a cut-off impossible detection process are executed. In the feeding tie post 6, a portion between the circuit breaker 36a and the current transformer 42 of one line corresponds to a DC bus CB, and two DC lines DC are connected to the DC bus CB, and one DC It can be considered that the circuit breaker 36a is omitted in the line DC. Further, a unidirectional circuit breaker 36 may be arranged in place of the bidirectional circuit breaker 36a so as to cut off currents in opposite directions, respectively, to constitute the feeding tie post 6. In this case, two DC bus CB between circuit breakers 36
And a DC line DC substantially similar to the DC substation 2 and the feeder section 4 is connected to the DC bus CB.

As described above, the current transformer 38 for detecting the current is provided in the feeding circuits 68 and 72 of the feeding section 4 and the feeding tie post 6, and the auxiliary contacts are provided in the circuit breakers 36 and 36a. By configuring the devices 70 and 74 to perform the abnormality detection processing based on the detection values of the current transformer 38 and the auxiliary contact, the feeder section 4 and feeder tie post 6 can also be used in the case of the DC substation 2. It is possible to obtain substantially the same effect as described above.

Next, in the above-described embodiment, the power supply equipment for supplying DC power to a pair of up / down lines has been described. The electrical equipment will be described. FIG. 10 is a schematic configuration diagram showing the configuration of the DC substation 2a in this case.

As shown in FIG. 10, the DC substation 2a
It has feeder circuits 14a and 14b for supplying power to each pair of feeder wires L1 and L2, respectively, and control devices 18a and 18b provided for each feeder circuit 14a and 14b. DC bus D forming circuits 14a and 14b
B and DB are connected to each other via a disconnector 78.

The feeder circuits 14a and 14b have exactly the same configuration as the feeder circuit 14 of the DC substation 2 except that the DC buses DB and DB are connected to each other via a disconnector 78. Therefore, the description is omitted here.
In addition, each feeder circuit 14a, 14b includes a transformation circuit 10,
Although a smoothing circuit (not shown) and the like are also connected, description of these is also omitted.

The disconnecting device 78 includes the above-described circuit breaker 36.
Similarly, an auxiliary contact (not shown) for detecting the open / closed state of the contact is attached, and its output is
a and 18b. Furthermore, each control device 18
a and 18b are connected to each other by a communication line SL, and through this communication line SL, the current value of each line SC, DC and BC in each feeding circuit 14a and 14b, the open / close state of the circuit breaker 36, and Results and the like of the abnormality detection processing are mutually input and output. And when the disconnector 78 is open,
Each of the control devices 18a, 18b includes a respective feeder circuit 14a,
The various abnormality detection processes described above are performed only inside 14b.
On the other hand, when the disconnecting switch 78 is closed, the main controller 18a performs the other controller 18 during the ground fault detection process.
From b, a detection value such as a current value for the feeder circuit 14b and an open / closed state of the circuit breaker is input via the communication line SL, and the process is executed together with a detection value for the feeder circuit 14a detected by itself. If the result of the abnormality determination indicates that there is an abnormality, an open command is output to the circuit breaker 36 of the feeder circuit 14a, and the determination result is notified to the control device 18b via the communication line SL. An open command is outputted to the circuit breaker 14b to operate each circuit breaker 36.

Note that the backflow detection processing and the interruption impossible detection processing are performed by the control devices 18a and 18 even when the disconnector 78 is closed.
b, but the determination result is notified to each of the other control devices 18a and 18b via the communication line SL, and the circuit breakers 36 of the respective feed circuits 14a and 14b are connected to each other by the other feed circuits. It is controlled in conjunction with the states of 14a and 14b.

Therefore, even in a configuration such as the DC substation 2a that supplies power to the plurality of pairs of feeders L1 and L2, the same effect as that of the DC substation 2 described above can be obtained. Although the embodiments have been described in detail, the present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the gist of the present invention.

For example, in the above-described embodiment, when it is determined that an abnormality has occurred in the abnormality detection processing, all the circuit breakers 36 are controlled to be opened. Only the relevant circuit breaker 36 may be opened. Further, in the supply line SC of the DC substation 2, a disconnecting switch may be used instead of the circuit breaker 36. In this case, when the control device 18 detects an abnormality in the abnormality detection processing, the transformation circuit 10 May be configured to open the AC circuit breaker 20.

Next, in the above embodiment, the control devices 18 and 7 of the DC substation 2, the feeder section 4, and the feeder tie post 6 are used.
Reference numerals 0 and 74 each perform an abnormality detection process only in the facility and control the opening and closing of the circuit breaker 36. However, the control devices 18, 70 and 74 of the facilities 2, 4, and 6 adjacent to each other are connected by signal lines. If an abnormality is detected as a result of the abnormality detection processing executed by each of the connected control devices 18, 70, and 74, the abnormality is notified to the control devices 18, 70, and 74 of the adjacent facility via a signal line. Then, the circuit breaker 36 may be operated in conjunction with it.

In the above embodiment, the DC line DC
Although the circuit breaker 36 and the disconnector 34 are separately connected,
A circuit breaker having a built-in disconnector may be connected to a position where the circuit breaker 36 is connected. Furthermore, in the circuit breaker 36 of the above embodiment, the contact is opened by cutting off the current flowing through the holding coil 60 in response to the opening command. However, the current flowing through the tripping coil 64 is controlled. The contacts may be opened. Further, as the circuit breaker 36,
Although the one in which the opening and closing operation of the contacts is electrically controlled is used, the one in which the opening and closing operation of the contacts is mechanically controlled may be used.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a DC substation 2 of the present embodiment.

FIG. 2 is an explanatory diagram illustrating an outline of a feeding facility in a DC electrification section of a railway according to the present embodiment.

FIG. 3 is an explanatory diagram showing a configuration of only a portion related to an opening / closing operation of a contact of a circuit breaker 36;

FIG. 4 is a flowchart of a ground fault detection process executed by the control device 18.

FIG. 5 is an explanatory diagram showing an area determined to be abnormal by a ground fault detection process.

FIG. 6 is a flowchart of a backflow detection process executed by the control device 18.

FIG. 7 is a flowchart of a shutdown impossible detection process executed by the control device 18.

FIG. 8 is a schematic configuration diagram of a feeder section 4;

FIG. 9 is a schematic configuration diagram of a feeder tie post 6.

FIG. 10 is a schematic configuration diagram of a DC substation 2 having a plurality of feeding circuits 14a and 14b.

FIG. 11 is a schematic configuration diagram of a feeder circuit in a conventional DC substation.

[Explanation of symbols]

2, 2a ... DC substation 4 ... Feeder section 6 ...
Feeder tie post 8 ... Power receiving circuit 10 ... Transformer circuit 12 ... High voltage power distribution circuit 14, 14a, 14b, 68, 72 ... Feeder circuit 16
... Smoothing circuit 18, 18a, 18b, 70, 74 ... Control device 20
... AC circuit breakers 22, 34, 44, 78 ... disconnectors 24 ... transformers
26 silicon rectifier 28, 38, 42 current transformer 36, 36a circuit breaker 40, 40a fault selection device 48 fixed contact 5
0: movable contact 52: open spring 54: operating punch 56: auxiliary contact
58: electromagnet 60: holding coil 62: holding current control circuit 64
... trip coil 66 ... induction shunt 76 ... DC transformer DB ... DC bus CB ... common bus SC ... supply circuit DC ... DC circuit BC ... spare circuit

Continuation of the front page (56) References JP-A-3-99948 (JP, A) JP-A-5-128930 (JP, A) JP-A-2-95940 (JP, A) JP-A-62-250832 (JP) , A) JP-A-6-243768 (JP, A) JP-A-64-14832 (JP, A) JP-B-2-47167 (JP, B2)

Claims (1)

(57) [Claims] 1. A plurality of DC lines respectively connected to a plurality of feeder lines provided for supplying DC power used for operation of a train, and a DC bus bar connecting one end of each of the plurality of DC lines. , At least one power supply for supplying DC power to the DC bus.
And feeding line, provided for each of the DC line and the supply line, one direct-current line
Or a contact for interrupting the current flowing through the supply line, and the contact is opened when a predetermined amount of current flows through the DC line or the supply line , or when an open command is input from outside. and interrupting means for, provided for each of the DC line and the supply line, one direct-current line
Current detecting means for detecting a current value and a current direction flowing through the supply line ; and determining an abnormality of the current flowing into and out of the DC bus based on the current value and the current direction detected by the current detecting means. And computing means for outputting an open command to predetermined breaking means when it is determined that there is a fault, at least a ground fault of the DC bus.
In the protection device of the feeding equipment for determining the abnormality of the current caused by the current, the operation means detects the current by the current detection means connected to the supply line.
To determine whether the measured current is flowing in the power supply direction
If the flow is in the opposite direction to the power supply direction,
A protection device for feeding equipment, characterized by comprising a backflow judging means for judging that there is a current .