JP2003032875A - Feeder current relay apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a feeder current relay apparatus which can decide a failure in a DC feeder circuit quickly. SOLUTION: This feeder current relay apparatus has a current differentiating circuit 6 which differentiates a current detection value with respect to a time, a current change rate deciding circuit 8 which outputs an operation command when the current differential value ΔI exceeds an operation level Ks, a current integrating circuit 9 which integrates with respect to a time, a difference between the current detection value and a base current of a current detection value at the rise time of the operation command output, and a failure deciding circuit 11 which outputs a failure signal when the integral value S exceeds an overcurrent set value Is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeder current relay device used for protecting a DC feeder circuit in a substation for electric railways.

[0002]

2. Description of the Related Art Conventionally, for short-circuit protection of a DC feeding circuit,
For example, a feeder current relay device as disclosed in Japanese Patent Laid-Open No. 63-90450 detects a current increase when a fault current occurs and operates a circuit breaker under the condition that a current increase change of a certain value or more continues for a certain time. Let By using this method, even if the current increase change when a fault current occurs and the current change at train notch up (acceleration) are close to each other, the current change due to the notch up for a short time compared to the fault current It can be separated and the DC feeding circuit can be sufficiently protected against a small fault current.

FIG. 10 is a block diagram for explaining a conventional device. In FIG. 10, 1 is a DC bus bar, 2 is a circuit breaker, 3 is a feeder line, 4 is a CT, 51 is an A / D converter for converting the detected current analog input from CT4 into a digital value, and 52 is a C
The PU unit 53 is an output unit that outputs a trip command to the circuit breaker 2. The load current of the DC feeder changes as the waveform shown in FIG. 12 due to notch switching or the like when the train is started. On the other hand, the fault current changes according to the waveform shown in FIG. There is a case in which the load current also increases with an increase in the train load, the difference between the magnitudes of the fault current and the load current disappears, and conversely, the load current increases more than the fault current. Therefore, in the conventional feeder current relay device, as shown in FIG. 11, the A / D converter 51 is used in consideration of the characteristics of the staircase waveform in which the load current sharply rises due to the notch up of the train or the like and becomes a constant value. An accident determination was carried out based on the AND condition of the judgment condition that the current value input from the above is a certain value (K) or more and the judgment condition that the current change more than the certain value continues for a certain time, and it was judged that the accident. In this case, the trip command is output to the circuit breaker 2.

[0004]

The conventional device is configured as described above, and the failure determination is always made for the set time because the failure determination is made by the current increase change of a certain value or more continuing for the certain time. Had the drawback of being delayed. In the case of a heavy short-circuit accident of a DC feeder, a large current will flow in the feeder circuit, and unless the power is cut off at a higher speed, not only will the breaker limit of the breaker be exceeded, it will be difficult to eliminate the accident, but damage to substation equipment will also occur. There is a danger of reaching.

Further, in recent years, the number of electric power regenerative vehicles has increased, and a regenerative invalidation phenomenon that occurs when a load vehicle notches off during regenerative braking of a regenerative vehicle traveling in one train section causes unnecessary operation in conventional devices. was there. FIG. 15 is an explanatory diagram for explaining a phenomenon that occurs in the DC feeding circuit when the regeneration is invalid. In this DC feeder circuit, the electric power that is full-wave rectified by the rectifier is supplied to the bus bar M, and further, from the feeder cable 61 provided with the circuit breaker Fl to the train cable 71, and from the feeder cable 62 provided with the circuit breaker F2 to the train cable. 72, circuit breaker F3
Power is supplied from the feeder line 63 provided with the breaker F4 to the train line 73, and from the feeder line 64 provided with the circuit breaker F4 to the train line 74. The train A receives power from the train line 73 to perform power, and the train B receives power from the train line 72 to perform power. Now, when train A becomes a regenerative car, train A is moving in the direction indicated by arrow a from train A through train line 73 → feeder line 63 → bus M → feeder line 62 → train line 72, and then to train B that is running on power. Regenerative power is supplied to it. As a result, the train B becomes a load vehicle that consumes regenerative power. Next, when the train B is notched off in this state, the load that consumes the regenerative power suddenly disappears, and the train A
The regenerative current sent from the power source is cut off and becomes zero.

In this way, when the regenerative current becomes zero, the regenerative voltage of the train A, which was a regenerative vehicle, rises sharply, and the overvoltage relay provided in the vehicle operates to short-circuit the main circuit through the overvoltage suppressing resistor ( Revocation revocation). As a result, the feeder 6
As for the feeder current in No. 3, the regenerative current −Il in the negative direction flows when the train A is a regenerative vehicle, but when the regenerative invalid state occurs, the regenerative current is cut off and an increase of + ΔIl occurs. Further, the short circuit current is generated by inserting the overvoltage suppressing resistor provided in the vehicle into the main circuit, and the current increase of + ΔI2 occurs (see the solid line characteristic in FIG. 14). In the conventional device, since it is impossible to distinguish between the current increase due to the regenerative invalidation and the current increase due to the fault current, the regenerative invalidation is determined as a failure,
There was a drawback of unnecessary operation.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a feeder current relay device which enables high speed failure determination. Moreover, it aims at obtaining the feeder electric current relay apparatus which can prevent an unnecessary operation | movement by regenerative revocation.

[0008]

SUMMARY OF THE INVENTION A feeder current relay device according to the present invention is a current detector for detecting a current in a DC feeder, a current differential calculator for differentiating the detected current value with time,
A current change rate determination means for outputting a calculation command when the current differential calculation value exceeds a predetermined first set value, the current detection value at the rising time of the calculation command output is acquired as a base current value, and the calculation command is obtained. While is being output
Difference current (difference current = above current detection value-above base current value)
And a failure determination means for outputting a failure signal when the current integration calculation value exceeds a predetermined second set value.

Further, the feeder current relay device according to the present invention has a current detecting means for detecting the current of the DC feeder, a current differential calculating means for time differentiating the current detected value, and a predetermined current differential calculating value. A current change rate determining means for outputting a first determination result when the first set value is exceeded, a current polarity determining means for outputting a second determination result when the current of the DC feeder has a polarity flowing to the load side, Computation start determination means for outputting a computation command when both the first and second determination results are output, the current detection value at the rising time of the computation command output is acquired as a base current value, and the computation command is output. During the operation, the difference current (difference current = the above current detection value-
A current integral calculating means for time-integrating the base current value),
And a failure determination means for outputting a failure signal when the current integral calculation value exceeds a predetermined second set value.

Also, the feeder current relay device according to the present invention has a current detection means for detecting the current of the DC feeder, a current differential calculation means for time differentiating the current detection value, and a predetermined current differential calculation value. A current change rate determining means for outputting a first determination result when the first set value is exceeded, a current polarity determining means for outputting a second determination result when the current of the DC feeder has a polarity flowing to the load side, First calculation start determination means for outputting a first calculation command when both the first and second determination results are output, and the current detection value at the rising time of the first calculation command output is set to a first value. While being acquired as the base current value and the first operation command is being output, the first difference current (first difference current = the current detection value−the first difference current).
First base current value) and outputs a first current integration calculation value by time integration, and when the first current integration calculation value exceeds a predetermined second set value, first Of the first judgment result for outputting the failure judgment result of No. 1, the output of the first judgment result from the current change rate judgment unit and the output of the second judgment result from the current polarity judgment unit are satisfied. The count is started at
From the current polarity determination means to the second time until the set time of
Second calculation start determination means for outputting a second calculation command when the determination result of is output, and the current detection value at the rising time of the second calculation command output is acquired as the second base current value. While the second operation command is being output, the second difference current (second difference current = current detection value−second base current value) is integrated over time to obtain a second current integration operation value. The second current integral calculation means for outputting, counting is started at the rise of the second calculation command output, and when the count value exceeds the predetermined second set time, the current detection value is set to the predetermined third value. Regenerative invalidation classification determining means for outputting a failure determination valid signal when the set value is exceeded, and second when the second current integral calculation value exceeds a predetermined fourth set value and the failure determination valid signal is output The second reason to output the failure judgment result of 2 Determining means, and in which with a third failure determination means for outputting a fault signal when the first or second failure judgment result is output.

Further, the feeder current relay device according to the present invention is such that the fourth set value is smaller than the second set value.

Further, in the feeder electric current relay device according to the present invention, when there is a DC feeder adjacent to the downstream side of the train progressing through the section, the current differential operation value input to the current change rate determining means. Is negative and the magnitude exceeds a predetermined fifth set value, the current differential calculation value is output to the current differential calculation means of the feeder current relay device installed in the adjacent DC feeder. It is provided with section compensation means for adding.

Further, in the feeder electric current relay device according to the present invention, the section compensating means adds a differential current calculation to the output of the differential current calculating means of the feeder current relay installed in the adjacent direct current feeder. A gain output processing means for adjusting the magnitude of the value is provided.

Further, in the feeder electric current relay device according to the present invention, when the fault signal is output from the fault judging means,
The circuit breaker installed on the power supply side of the DC feeder is connected to the current detecting means so as to be cut off.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Hereinafter, the first embodiment of the present invention will be described with reference to FIG. 1 is a DC bus,
2 is a circuit breaker inserted in the feeder 3 branched from the DC bus 1; 4 is a CT as a current detecting means for measuring the current flowing in the feeder 3; 5 is an analog amount inputted from CT 4 is converted into a digital amount. A / D converter, 6 is A / D converter 5
The current differential operation circuit that time-differentiates the current value input from to output the current differential operation value ΔI, and 7 is the operation level (K) for setting the level value (first set value) of the failure determination start.
s) a setter, 8 is a current change rate determination circuit that outputs a calculation command when the current differential calculation value ΔI obtained from the current differentiation calculation circuit 6 exceeds the calculation level value set by the calculation level (Ks) setter 7. , 9 sets the current detection value at the time when the output of the calculation command from the current change rate determination circuit 8 is set to the base current value, and the difference current (difference current = current detection value while the calculation command is output). -Base current value) is integrated over time,
If there is no calculation command, the current integration calculation circuit that resets the current integration value to 0 is set as the overcurrent that sets the failure determination setting value (second setting value) of the current integration calculation value S output from the current integration calculation circuit 9. The (Is) setter 11 compares the current integration calculation value S output from the current integration calculation circuit 9 with the failure judgment set value Is, and outputs a failure signal when the current integration calculation value is large, 12 Is a trip command output unit that outputs a trip command to the circuit breaker 2 when the failure determination circuit 11 outputs a failure signal.

Next, the operation of the first embodiment will be described. As described above, the load current of the DC feeder changes with the waveform shown in FIG. 12 due to notch switching or the like when the train is started. On the other hand, the fault current changes according to the waveform shown in FIG. In some cases, the load current increases as the train load increases, and there is no difference in magnitude between the failure current and the load current, and conversely, the load current increases more than the failure current. Therefore, in the feeder current relay device shown in FIG. 1, considering that the load current has a characteristic of a step-throwing waveform that rises sharply due to notch up of the train or the like and becomes a constant value,
Then, the current detection value input through the A / D converter 5 is subjected to the time differentiation operation by the current differentiation operation circuit 6. When it is determined that the current differential calculation value ΔI is equal to or greater than the set value Ks, the current integration calculation circuit 9 sets the current detection value at the time of the determination as the base current, and the current increase amount is calculated from the difference between the current detection value and the base current. Calculate and integrate over time. The failure determination circuit 11 is
When it is determined that the time integrated value of the amount of increase in current exceeds the overcurrent set value Is, it is determined as a failure accident and a failure signal is output. The trip command output unit 12 causes the circuit breaker 2 to output a failure signal.
The trip command is output to.

FIG. 2 is a timing chart showing the operation of this device when the train is started. In each notch-up step over two steps, the current differential operation value ΔI exceeds the operation level Ks to start the integration operation, and when the operation level Ks or less is reached, the integration value is reset to zero. Then, in any of the integration intervals, the integral calculation value S does not reach the overcurrent setting value Is, and accordingly, no failure determination is made,
Smooth driving operation is performed. Note that the notch-up period shown in FIG. 2 is the time from the start of notch-up until the current does not increase, and in the conventional device, if the current increase exceeds a certain level even after this period elapses, failure occurs. It was determined to have occurred.

On the other hand, FIG. 3 is a timing chart showing the operation of the present apparatus when an accident occurs during power running and an overcurrent flows. Immediately when the current rises due to the occurrence of a failure, the current differential calculation value ΔI becomes equal to or higher than the calculation level Ks and the integral calculation is started. This integration calculation is continued in the time zone shown by the whole integration section in the figure, but the integration calculation value S from the current integration calculation circuit 9 increases sharply immediately after the start of integration, and is sufficiently larger than the notch up period in the figure. At the time point indicated by the short integration interval, the overcurrent set value Is is reached, the failure signal is output from the failure determination circuit 11, and the circuit breaker 2 is tripped.

As described above, in the first embodiment of the present invention, in a heavy short-circuit fault in which an excessive fault current occurs, the time integration value of the current increase amount instantaneously exceeds the overcurrent set value, and high speed and high accuracy are achieved. It is possible to realize a wireless current relay device.

Embodiment 2. The second embodiment of the present invention will be described below with reference to FIG. The description will focus on the parts that differ from the first embodiment. Reference numeral 13 is a current polarity determination circuit that outputs a signal when the current detection value is 0 or more (the direction flowing to the load side is positive), and 14 is the output from the current change rate determination circuit 8 (first determination result) and the current. It is a calculation start determination circuit that outputs a calculation command under an AND condition with the output from the polarity determination circuit 13 (second determination result).

Next, the operation of the second embodiment will be described with reference to FIG.
This will be described with reference to the timing chart shown in FIG. Figure 5
Shows the current flow at the time of occurrence of regenerative invalidation previously described by the solid line characteristic of FIG. 14, and the operation in the conventional case is also shown in order to help understanding of the present application. First, the conventional case will be described. If the regenerative load suddenly disappears while the train connected to the feeder 3 is running in regenerative operation, the current increases rapidly from a negative value, so the current increase rate is calculated immediately. This detection period continues until the level is exceeded and the current is positively inverted to reach its maximum value as shown in the figure. Therefore, if this conventional detection period exceeds the conventional detection setting value (notch up period) described above with reference to FIGS. 2 and 3, it is erroneously determined as an overcurrent fault.

On the other hand, in the apparatus shown in FIG. 4 of the present application,
Since the current polarity determination circuit 13 is provided and the integral calculation is started from the time when the current is positively inverted, the integration period is shortened as shown in the figure, and as a result, the integral calculation value S remains at a low level and the overcurrent set value is exceeded. No fault signal is output without reaching Is.

As described above, according to the second embodiment of the present invention, it is possible to detect the current change in the regenerative invalidation phenomenon by excluding the change in the regenerative current itself, and prevent unnecessary interruption at the time of regenerative invalidation. it can.

Embodiment 3. Hereinafter, the third embodiment of the present invention will be described with reference to FIG. The third embodiment has the following configuration added to the second embodiment. That is, 15 is a time (Ts) setter that sets a calculation time (Ts), which is a first set time described later, 16 is an output of the current change rate determination circuit 8, and an output of the current polarity determination circuit 13. When the output of the current polarity determination circuit 13 is turned on by the time the count value is satisfied and the count value reaches the calculation time (Ts) set by the time (Ts) setter 15, the second calculation A second calculation start determination circuit that outputs a command, 20 sets the detected current value input from the A / D converter 5 at the time when the output of the second calculation command starts to the base current value, and executes the second calculation. While the command is being output, the difference between the detected current value input by the A / D converter 5 and the base current value is time-integrated, and if there is no second operation command, the current integrated value is reset to 0. Current integration calculation circuit of, 17 is regenerative revocation A classification time (Tv) setter for setting a regenerative revocation separation time (Tv), which is a second set time for preventing failure erroneous judgment due to a synergistic phenomenon and invalidating failure judgment during regenerative revocation, and 18 is a regenerative Revocation classification time (Tv)
In order to distinguish it from the regenerative revocation phenomenon based on the detected current value after that, a classification level (Kv) setter that sets the regenerative revocation classification level value (Kv) that is the third set value, and 19 outputs the second operation command. After the expiration of the revocation revocation sorting time (Tv)
When the current detection value input by the D / D converter 5 exceeds the regenerative invalidation classification level value (Kv), a regeneration invalidation classification determination circuit that outputs a failure determination valid signal, 21 is a current by the second current integration calculation circuit 20. Failure determination set value Is of integrated value S2
An overcurrent (Is2) setter for setting 2 (fourth set value), 22 is a current integrated value S2 output from the second current integration calculation circuit 20, and is set by an overcurrent (Is2) setter 21. A second failure determination circuit that outputs a failure signal (second failure determination result) when the failure determination set value Is2 is exceeded and a failure determination valid signal is output from the regenerative invalidation classification determination circuit 19, 23 Outputs a failure signal to the trip command output unit 12 when either the failure determination circuit 11 or the second failure determination circuit 22 outputs a failure signal.
It is an OR circuit as a failure determination means.

In the third embodiment, when the failure indicated by the one-dot chain line in FIG. 14, that is, the light short-circuit failure occurs in the line where the regenerative vehicle exists, this can be surely determined. . The operation will be described below with reference to the timing chart shown in FIG. As shown in FIG. 14, when a light short-circuit fault occurs in a line in which a regenerative vehicle exists, the transient current increase amount may be smaller than that due to the regenerative invalidation phenomenon, and the difference between the accident and the regenerative invalidation phenomenon may be distinguished. Will be difficult. In the third embodiment, in consideration of the phenomenon that the load current decreases after a certain time in the regenerative revocation phenomenon, the regenerative revocation separation time (Tv) that can separate the regenerative revocation is set, and this set time (Tv) After that, the regenerative invalidation classification determination circuit 19 for determining that the load current (current detection value) is equal to or higher than the regenerative invalidation classification level (Kv) is provided to classify the load current as not the regenerative invalidation. When the integral calculation value S2 exceeds the overcurrent setting value Is2, it is determined that there is a failure.

Further, in the third embodiment, since the regenerative invalidation phenomenon is separated and the load current is not erroneously determined as a failure,
The time (Ts) setter 15 sets the calculation time Ts which is the failure detection period. When the output of the current polarity determination circuit 13 does not rise within the above calculation time Ts after the output of the current change rate determination circuit 8 rises in a state where the output of the current polarity determination circuit 13 is not present (current is negative), that is, When the current is not positively inverted, the second operation command is not output. For example, if two regenerative vehicles are operating on the load side of the feeder and the number of regenerative vehicles is reduced to one train, the above phenomenon occurs and erroneous determination is prevented.

Further, for example, when a resistance ground fault accident of the feeder occurs while the regenerative vehicle is operating on the load side of the feeder, the fault current to the ground fault is added to the current from the feeder and also from the regenerative vehicle. The electric current of is superposed. Therefore, the current value at CT4 becomes smaller than the fault current, and in order to promptly cut off the fault current, the overcurrent set value Is2 used for the failure determination with respect to the output S2 of the second current integration calculation circuit 20 is ,
It is desirable to set the output S of the current integration calculation circuit 9 to a value smaller than the overcurrent setting value Is for determining a failure.

As described above, in the third embodiment, it is possible to reliably judge and detect a light short-circuit fault that occurs in a line in which a regenerative vehicle exists.

Fourth Embodiment Hereinafter, Embodiment 4 of the present invention will be described with reference to FIG. When a train moving while consuming a large amount of current passes through a section of a substation, the electric wire current relay device that makes an accident determination based on the amount of current change for each line is There is a possibility that it will be judged as an accident from the current increase and unnecessary operation will be performed. The fourth embodiment realizes the solution, and hereinafter, the description will be focused on the parts different from the previous embodiments.

Reference numeral 25 is a section compensation level (Kw) setter for setting a compensation level Kw (fifth set value) for preventing erroneous determination of section passing phenomenon, and 26 is input to the current change rate determination circuit 8. When the amount of decrease of the current differential calculation value ΔI exceeds the compensation level Kw, strictly speaking, when the current differential calculation value ΔI has a negative polarity and the magnitude thereof exceeds the magnitude of the compensation level Kw. A section compensation judgment circuit that outputs a signal, and a switch 27 that outputs the current differential calculation value ΔI when the section compensation judgment circuit 26 has an output, and outputs 0 when the section compensation judgment circuit 26 has no output. , 28 is a gain output processing circuit for outputting the ΔI correction value obtained by multiplying the output of the switch 27 by the gain Gs to the feeder current relay device of the line adjacent to the downstream side of the train progress, and 29 is the adjacent output circuit. ΔI from conductor current relay device eaves
It is an adder that adds the correction value to the output of the current differential operation circuit 6 of its own feeder current relay device. 31-34
Is the feeder, breaker, CT, A /
It is a D converter. Reference numeral 35 is a section.

Next, the operation will be described with reference to FIG. 9 showing a timing chart. Now, as shown in FIG. 8, the vehicle under power running is fed by the feeder 3 (hereinafter referred to as feeder A).
It is assumed that the side moves to the feeder line 31 (hereinafter referred to as feeder line B). First, on the feeder A side, as shown in FIG.
As shown in (a), the current suddenly decreases due to the separation of the vehicle load. As a result, the current differential operation value ΔI is negative and its magnitude exceeds the compensation level Kw (FIG. 9B), and the gain output processing circuit 28 corrects ΔI in the feeder current relay device on the feeder B side. The value is output. On the feeder B side, the current suddenly increases as the vehicle enters (FIG. 9 (c)), but the current differential calculation value ΔI output from the current differential calculation circuit 6 is as shown in FIG. 9 (d). From the large value before correction,
The correction value is subtracted and reduced to the operation level Ks or less, the operation command is not output, and therefore there is no risk of erroneous determination of failure.

As described above, in the fourth embodiment, it is possible to offset the amount of increase in current due to the train load coming from the adjacent line by the correction value of the adjacent line, and it is possible to prevent unnecessary interruption due to the section passage phenomenon. . Note that the device of FIG. 8 is configured based on the circuit of FIG. 4 of the second embodiment described above, but may be configured based on the circuit of FIG. 1 and FIG. 6 of the first or third embodiment. .

[0033]

As described above, the feeder current relay device according to the present invention comprises a current detecting means for detecting the current of the DC feeder, a current differentiating means for differentiating the detected current value with time,
A current change rate determination means for outputting a calculation command when the current differential calculation value exceeds a predetermined first set value, the current detection value at the rising time of the calculation command output is acquired as a base current value, and the calculation command is obtained. While is being output
Difference current (difference current = above current detection value-above base current value)
Since a current integration calculation means for time integration and a failure determination means for outputting a failure signal when the current integration calculation value exceeds a predetermined second set value are provided, a high speed and highly accurate feeder current relay device. Can be realized.

Further, the feeder current relay device according to the present invention is such that the current detecting means for detecting the current of the DC feeder, the current differential calculating means for time differentiating the current detected value, and the current differential calculated value are predetermined. A current change rate determining means for outputting a first determination result when the first set value is exceeded, a current polarity determining means for outputting a second determination result when the current of the DC feeder has a polarity flowing to the load side, Computation start determination means for outputting a computation command when both the first and second determination results are output, the current detection value at the rising time of the computation command output is acquired as a base current value, and the computation command is output. During the operation, the difference current (difference current = the above current detection value-
A current integral calculating means for time-integrating the base current value),
And a failure determination means for outputting a failure signal when the current integral calculation value exceeds a predetermined second set value.
It is also possible to prevent unnecessary cutoff due to normal reactivation.

Also, the feeder current relay device according to the present invention has a current detecting means for detecting the current of the DC feeder, a current differential calculating means for time differentiating the current detected value, and a predetermined current differential calculating value. A current change rate determining means for outputting a first determination result when the first set value is exceeded, a current polarity determining means for outputting a second determination result when the current of the DC feeder has a polarity flowing to the load side, First calculation start determination means for outputting a first calculation command when both the first and second determination results are output, and the current detection value at the rising time of the first calculation command output is set to a first value. While being acquired as the base current value and the first operation command is being output, the first difference current (first difference current = the current detection value−the first difference current).
First base current value) and outputs a first current integration calculation value by time integration, and when the first current integration calculation value exceeds a predetermined second set value, first Of the first judgment result for outputting the failure judgment result of No. 1, the output of the first judgment result from the current change rate judgment unit and the output of the second judgment result from the current polarity judgment unit are satisfied. The count is started at
From the current polarity determination means to the second time until the set time of
Second calculation start determination means for outputting a second calculation command when the determination result of is output, and the current detection value at the rising time of the second calculation command output is acquired as the second base current value. While the second operation command is being output, the second difference current (second difference current = current detection value−second base current value) is integrated over time to obtain a second current integration operation value. The second current integral calculation means for outputting, counting is started at the rise of the second calculation command output, and when the count value exceeds the predetermined second set time, the current detection value is set to the predetermined third value. Regenerative invalidation classification determining means for outputting a failure determination valid signal when the set value is exceeded, and second when the second current integral calculation value exceeds a predetermined fourth set value and the failure determination valid signal is output The second reason to output the failure judgment result of 2 Since the determination means and the third failure determination means for outputting the failure signal when the first or second failure determination result is output are provided, the light short-circuit failure occurring in the line where the regenerative vehicle exists is surely performed. It can be determined and detected.

Further, in the feeder current relay device according to the present invention, since the fourth set value is set smaller than the second set value, the ground fault which occurs in the line in which the regenerative vehicle exists is promptly judged. Can be detected.

Further, in the feeder electric current relay device according to the present invention, when there is a DC feeder adjacent to the downstream side of the train progressing through the section, the current differential operation value input to the current change rate determining means. Is negative and the magnitude exceeds a predetermined fifth set value, the current differential calculation value is output to the current differential calculation means of the feeder current relay device installed in the adjacent DC feeder. Since the section compensating means for adding is provided, unnecessary interruption due to the section passage phenomenon can be prevented.

Further, in the feeder electric current relay device according to the present invention, the section compensating means adds a differential current calculation to the output of the differential current calculating means of the feeder current relay installed in the adjacent direct current feeder. Since the gain output processing means for adjusting the magnitude of the value is provided, the section pass compensation operation can be more appropriately realized.

Further, in the feeder electric current relay device according to the present invention, when the fault signal is output from the fault judging means,
Since the circuit breaker installed on the power supply side of the DC feeder is located on the power supply side with respect to the current detecting means, the feeder circuit is surely protected.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a feeder current relay device according to a first embodiment of the present invention.

FIG. 2 is a timing chart for explaining a failure determination operation when the load changes (notch up).

FIG. 3 is a timing chart for explaining a failure determination operation at the time of an accident during power running.

FIG. 4 is a circuit configuration diagram showing a feeder current relay device according to a second embodiment of the present invention.

FIG. 5 is a timing chart for explaining a failure determination operation when the regeneration is invalid.

FIG. 6 is a circuit configuration diagram showing a feeder current relay device according to a third embodiment of the present invention.

[Fig. 7] In the event of a light short circuit failure in the line where a regenerative vehicle exists,
6 is a timing chart for explaining a failure determination operation.

FIG. 8 is a circuit configuration diagram showing a feeder current relay device according to a fourth embodiment of the present invention.

FIG. 9 is a timing chart for explaining a failure determination operation when passing a section.

FIG. 10 is a circuit configuration diagram showing a conventional feeder electric current relay device.

FIG. 11 is a diagram showing a failure determination logic of a conventional device.

FIG. 12 is a diagram showing a current waveform when a load changes (notch up) in a DC feeding circuit.

FIG. 13 is a diagram showing a fault current waveform in a DC feeding circuit.

FIG. 14 is a diagram showing a current waveform at the time of regenerative invalidation and a light short-circuit fault current waveform in a line where a regenerative vehicle exists.

FIG. 15 is a diagram for explaining operations of regeneration and regeneration invalidation.

[Explanation of symbols] 2,32 Circuit breaker, 3,31 Feeder wire, 4,33 C
T, 6 current differential operation circuit, 7 operation level (Ks) setting device, 8 current change rate determination circuit, 9 current integration operation circuit, 10 overcurrent (Is) setting device, 11 failure determination circuit, 12 trip command output section, 13 current polarity determination circuit, 14 calculation start determination circuit, 15 time (Ts) setter, 16 second calculation start determination circuit, 17 classification time (Tv) setter, 18 classification level (Kv) setter, 1
9 Regenerative revocation discrimination judgment circuit, 20 2nd current integral calculation circuit, 21 Overcurrent (Is2) setter, 22 2nd failure judgment circuit, 23 OR circuit, 25 Section compensation level (Kw) setter, 26 section compensation Judgment circuit,
27 switcher, 28 gain output processing circuit, 29 adder, 35 section.

Claims (7)

[Claims] 1. A current detecting means for detecting a current of a DC feeder, a current differential calculating means for time differentiating the detected current value,
A current change rate determination means for outputting a calculation command when the current differential calculation value exceeds a predetermined first set value, the current detection value at the rising time of the calculation command output is acquired as a base current value, and the calculation command is obtained. While is being output
Difference current (difference current = above current detection value-above base current value)
The feeder electric current relay device comprising a current integration calculation means for time integration of the above, and a failure determination means for outputting a failure signal when the current integration calculation value exceeds a predetermined second set value. 2. A current detecting means for detecting a current of a DC feeder, a current differentiating means for time differentiating the detected current value,
A current change rate determination means for outputting a first determination result when the current differential operation value exceeds a predetermined first set value, and a second determination result when the current of the DC feeder has a polarity flowing to the load side. Current polarity determining means for outputting the above-mentioned first and second
Calculation start determining means for outputting a calculation command when the calculation result is output, the current detection value at the rising time of the calculation command output is acquired as a base current value, and the difference current is output while the calculation command is output. A current integration calculation means for time-integrating (difference current = the above current detection value−the above base current value), and a failure determination means for outputting a failure signal when the above current integration calculation value exceeds a predetermined second set value. Prepared electric wire current relay device. 3. A current detecting means for detecting a current of a DC feeder, a current differential calculating means for time differentiating the detected current value,
A current change rate determination means for outputting a first determination result when the current differential operation value exceeds a predetermined first set value, and a second determination result when the current of the DC feeder has a polarity flowing to the load side. Current polarity determining means for outputting the above-mentioned first and second
The first calculation start determining means for outputting the first calculation command when the determination result of 1 is output, and the current detection value at the rising time of the output of the first calculation command is acquired as the first base current value. While the first calculation command is being output, the first current difference calculation (first difference current = current detection value−first base current value) is integrated over time to obtain a first current integration calculation value. A first current integration calculation means for outputting the first current integration calculation value, a first failure determination means for outputting a first failure determination result when the first current integration calculation value exceeds a predetermined second set value, the current change The counting is started under the condition that the first determination result is output from the rate determining means and the second determination result is not output from the current polarity determining means, and the count value is set to the predetermined first set time. Until the second judgment from the current polarity judging means Second calculation start judgment means for outputting a second operation instruction when the result is output, the current detection value at the rise time of the second operation command output second
While being acquired as the base current value of the second calculation command, the second differential current (second differential current = the current detection value−the second base current value) is integrated over time. Second
Second current integration calculation means for outputting the current integration calculation value of
Counting starts at the rise of the second calculation command output, and when the count value exceeds the predetermined second set time, the current detection value exceeds the predetermined third set value. Failure determination valid Regenerative revocation classification judgment means for outputting a signal,
Second failure determination means for outputting a second failure determination result when the second current integral calculation value exceeds a predetermined fourth set value and the failure determination valid signal is output, and the first or second failure determination means. A feeder electric current relay device comprising a third failure determination means for outputting a failure signal when a second failure determination result is output. 4. The feeder current relay device according to claim 3, wherein the fourth set value is smaller than the second set value. 5. When there is a DC feeder adjacent to the downstream side of the train progressing through the section, the current differential operation value input to the current change rate determination means has a negative polarity and its magnitude is predetermined. And a section compensating means for adding the current differential operation value to the output of the current differential operation means of the feeder current relay installed on the adjacent DC feeder when the value exceeds the fifth set value. Claims 1 to 4
The electric wire current relay device according to any one of 1. 6. The section compensating means is provided with a gain output processing means for adjusting the magnitude of a current differential operation value added to the output of the current differential operation means of the feeder current relays installed in the adjacent DC feeders. 6. The method according to claim 5, wherein
Feeder current relay device described in. 7. The circuit breaker installed on the power supply side of the DC feeder in the power supply side when the failure signal is output from the failure determining means is cut off. The electric wire current relay device according to any one of 1.