JP2003143775A - Fault waveform collecting/handling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize the input channel of a measurement signal in a plurality of small-sized stations for forming a slave station for measurement input. SOLUTION: A slave station is formed of a plurality of small-sized stations 10 that are used for small-sized power facilities and are standardized. A master station 6 has a means for maintaining setting information on a plurality of fault waveform groups for specifying the common bus voltage waveform of each station 10 and the current waveform of a group of related feeders as fault waveform, a means for selecting a fault waveform group corresponding to a fault point when a fault occurs in a power supply system, and a means for selectively collecting the measurement signal of the common bus voltage and that of a feeder current in the group of related feeders from the measurement signal of each station 10 based on the setting information of the group for printing out as the fault waveform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transmits a measurement signal such as voltage and current when a fault occurs in a power system, which is measured and input to a slave station, to a master station having a waveform analysis processing function, and the master station transmits the fault waveform. The present invention relates to an accident waveform collecting and processing device for printing electric power equipment, and more particularly, to effective use of a measurement signal input channel of each small-scale station when a slave station is formed by a plurality of small-scale stations.

[0002]

2. Description of the Related Art Conventionally, this type of accident waveform collecting and processing apparatus is also called an oscilloscope for electric power, and as shown in FIG. 6, it is a parent station 1 of a power company business office and a child of an unmanned electric station such as a substation. Station 2
And the signal cable 3 are connected to each other.

At this time, the master station 1 has a main body unit 4 and a printer 5, and the main body unit 4 is composed of an arithmetic processing unit 4a of a microcomputer configuration having a waveform analysis processing function and a monitor display 4b.

On the other hand, the slave station 2 is generally used as terminals for a plurality of input channels for measurement signals, and generally for terminals ac for a plurality of input channels for analog measurement signals such as bus voltage and feeder current of a power system and contact signals. It has terminals ci of a plurality of input channels for digital measurement signals whose values change.

The slave station 2 receives the measurement signal of each channel of the terminals ac and ci at a cycle of 300 μsec, for example, and when a system fault such as a ground fault or a short circuit occurs, the fault detection or the main unit 4 of the master station 1 is performed. Based on the data request from
The latest measurement signal of each channel is fetched and sent to the arithmetic processing unit 4a of the master station 1.

Based on the waveform analysis processing of the arithmetic processing unit 4a, the master station 1 analyzes the waveforms of the collected measurement signals to detect the occurrence time of an accident, the recovery time, etc., and the bus voltage waveform of the power system and each feeder. While displaying the group of accident waveforms of the analysis results including the current waveform on the monitor display 4b,
Print data of a predetermined format is formed and supplied to the printer 5, and is printed out as shown in FIG. 7, for example.

The accident waveform printed out is
Due to restrictions such as paper size, normally, at maximum per paper,
16 channels (16CH) analog waveforms of analog measurement signals and 3 of digital measurement signals such as trip contact signals
It consists of 2 channels (32CH) digital waveform.

By the way, the number of input channels of the measurement signal required for the slave station 2 varies depending on the scale of the electric power equipment and the like, and in a small-scale equipment such as private equipment for general consumers, 16 channels of analog measurement signals and digital measurement are carried out. Signal 3
Even if two channels are sufficient, in large-scale facilities such as electric power companies, the power system will be two systems, A and B, and the number of feeders drawn from these systems will be large. About 100 channels (1
00CH) is required, and 1 for digital measurement signals
In some cases, 28 channels (128CH) are required.

When manufacturing this kind of accident waveform collecting and processing apparatus, as the slave station 2, a slave station having the number of input channels corresponding to the scale of the power equipment or the like is individually formed or the number of input channels of the measurement signal is small. If you prepare a small-scale station and a large-scale station with a large number of measurement signal input channels, and select and use a small-scale station or a large-scale station according to the scale of the power equipment, production efficiency will increase. However, it cannot be formed inexpensively.

Further, since the equipment for large-scale equipment is not sold in large quantities like the equipment for small-scale equipment,
Preparing a large-scale station is extremely uneconomical.

Furthermore, due to the expansion of power facilities, etc.
If there is a possibility of changing this type of collecting and processing apparatus from a small-scale facility to a large-scale facility, it is conceivable to make the slave station 2 for a large-scale facility in advance. , Very uneconomical.

Therefore, as the slave station 2, when only a small-scale station in which the number of input channels of analog measurement signals is standardized to 16 channels for small-scale power equipment is manufactured and used for large-scale power equipment, FIG. As shown in
A plurality of small stations 2'through a communication network 3 '
The number of input channels corresponding to a large-scale station is secured by connecting a plurality of small-scale stations 2'to reduce the cost of this kind of accident waveform collecting and processing apparatus.

[0013]

In the case of the conventional apparatus shown in FIG. 8, each small-scale station 2'uses a maximum of 16 channels of analog measurement signals and 32 channels of digital measurement signals according to their respective timing references. Since the individual stations are individually fetched, even if the master station 1 requests the measurement signals from each small station 2'when an accident occurs, the timing of each measurement signal obtained from each station 2'is different for each station 2 ', and the same timing is obtained. It cannot be handled as a waveform captured by.

Therefore, conventionally, as shown in FIG. 9, the small-sized station 2'changes the paper and prints out. Note that stations a and b in FIG. 9 represent small-scale stations 2 ', and an accident waveform based on each measurement signal of the station a is printed on the paper Pa of the station a and each measurement of the station b is printed on the sheet Pb. The accident waveform based on the signal is printed out.

In this case, since the bus voltage waveforms captured by the small stations 2'are printed out for each of the sheets Pa and Pb, an analog measurement signal of the bus voltage is input to each small station 2 '. , It is necessary to individually take in the bus voltage by each small-scale station 2 ', and some input channels of the analog measurement signals of all the small-scale stations 2'are assigned to the analog measurement signals of the bus voltage.

The analog measurement signal of the bus voltage is a 4-channel (4CH) signal of three phases U, V and W and zero phase, and the analog measurement signal of the feeder current is also U, V, W.
Since it is a signal of 4 channels (4CH) of 3 phase of W and 0 phase, each small station 2'has an analog measurement signal if it is a large-scale power equipment of A, B, 2 lines, 23 feeders. 8 channels out of all 16 channels (8CH)
The measurement signal of the bus voltage occupies (= 2 × 4CH), and the remaining 8
Only two feeder current measurement signals can be fetched depending on the channel, and the number of required small-scale stations 2'is (23/2
≈) 12

Therefore, if it is attempted to standardize the slave stations by the small-scale station 2'and to reduce the cost, conventionally, when the small-scale station 2'is applied to a large-scale power facility with a large number of feeders, an extremely large number of small-scale stations 2 There is a problem that requires.

According to the present invention, when forming a slave station by a plurality of small-scale stations whose input channels are standardized to a fixed number, the fault waveform printed out at the master station when a fault occurs in the power system is improved, and the predetermined waveform is improved. Only the small-scale station needs to take in the measurement signal of the bus voltage so that the input channels of the small-scale station of the entire device can be effectively used, and the number of small-scale stations is minimized to greatly reduce the cost. The challenge is to

[0019]

In order to solve the above-mentioned problems, in the accident waveform collecting and processing device according to claim 1, the slave station is standardized so that the number of input channels of the measurement signal is a constant for small-scale power equipment. Formed by multiple small-scale stations,
A means for holding the setting information of a plurality of fault waveform groups that designates the common bus voltage waveform of each small-scale station and the current waveform of a group of related feeders related to the fault as the fault waveform, and when a power system fault occurs, Based on the means to specify the accident point by the waveform analysis processing function and select the corresponding accident waveform group, and the setting information of the selected accident waveform group,
From the measurement signal of each input channel of each small-scale station, the measurement signal of the common bus voltage and the measurement signal of the feeder current of a group of related feeders are selectively collected, and the waveform of each collected measurement signal is printed as an accident waveform. And means for out.

Therefore, when a fault occurs in the power system, the master station selects a fault waveform group corresponding to the bus at the fault point or the feeder and, based on the setting information of the selected group, the common bus voltage of each small station. Collect and edit the measurement signal of each input channel only for the small stations needed to print out the waveform and the current waveform of a group of related feeders,
Print out the accident waveform of the selected group.

In this case, the accident waveform is not formed by individually printing out the waveforms of the measurement signals collected from all the small-scale stations as in the conventional case, but forming each small-scale station. Common bus voltage waveform and a series of related feeder current waveforms obtained from measurement signals of one or more small stations are collectively printed out.

Regardless of the selected fault waveform group, the bus voltage waveform in the fault waveform may be the bus voltage waveform common to each of the small stations described above. It is only necessary to input the measurement signal of the bus voltage to the terminal and make the bus voltage waveform of the measurement signal a common bus voltage waveform. As a result, it is not necessary to input the measurement signal of the bus voltage to the remaining small stations. , The input channel of the small-scale station of the entire device can be effectively used, and the number of the small-scale stations for the large-scale power equipment can be significantly reduced as compared with the conventional one.

Next, the accident waveform collecting and processing apparatus according to claim 2 is the accident waveform collecting and processing apparatus according to claim 1, in which a part of the input channels of a predetermined small-scale station is set as an input channel of the bus voltage to a predetermined value. Input the measurement signal of the bus voltage only to the small-scale station, and make each small-scale station capture the measurement signal of each input channel to the small-scale station when the power system accident occurs. And a means for automatically transmitting the measurement signal of each input channel including the measurement signal of the bus voltage to the master station when an accident occurs in the power system, provided in the predetermined small-scale station, and the power station When an accident occurs, the means for forming a waveform of the bus voltage common to each small station by the received measurement signal of the bus voltage of a predetermined small station.

Therefore, when an accident occurs in the power system, each small-scale station acquires the measurement signal of each input channel in synchronization with each other. At this time, only the predetermined small-scale station measures the busbar voltage. Take in.

Then, the measurement signal of a predetermined small station is automatically sent to the master station, and the master station measures the bus voltage of the predetermined small station and the common bus bar of each small station in the fault waveform is generated by the master station. Form a voltage waveform.

In this case, the measurement signals of the small stations are simultaneously acquired synchronously, and the common bus voltage waveform and the current waveform of a series of related feeders in the fault waveform to be printed out are the same as those of the selected fault. Regardless of the waveform group, in other words, regardless of the bus and feeder in which the accident occurred, synchronization is always achieved.

Therefore, even if the small station that receives the measurement signal of the bus voltage waveform and the small station that receives the measurement signal of the current waveform of the related feeder are different, the bus voltage waveform of the fault waveform to be printed out. And the current waveforms of the respective related feeders are synchronized with each other, so that it is possible to provide a specific means for capturing the measurement signal, which achieves the effect of claim 1.

Next, in the accident waveform collecting and processing device according to the third aspect, when an accident occurs in the power system, a small station near the accident point issues a start command for signal acquisition to each of the remaining small stations based on the detection of the accident. In addition to transmitting the measurement signal of each input channel of its own station to the parent station, a predetermined small-sized station, based on the accident detection of the own station or the arrival of the start command,
Each small scale that automatically transmits the measurement signal of each input channel of the own station including the measurement signal of the bus voltage to the master station and collects the measurement signal to the master station based on the setting information of the selected fault waveform group Each small-scale station is equipped with means for sequentially outputting the transmission request of the measurement signal of each input channel to the small-scale stations near the accident point of the station and the remaining small-scale stations except the predetermined small-scale station. The station is provided with means for transmitting, to the master station, the measurement signal of each input channel, which is taken in based on the start command, when the transmission request is received.

Therefore, when a power system fault occurs, the common bus voltage measurement signal and the feeder current measurement signal at the fault point are automatically transmitted from each small station to the master station, but are selected. The measurement signals of the feeder currents of the remaining related feeders of the group are sequentially sent from the remaining small stations to the parent station on condition that the transmission request from the parent station is received.

Therefore, the concentration of the transmission of the measurement signal from each small-scale station to the master station is prevented, and the processing load on the master station is not extremely increased. It is possible to print out the accident waveform of claim 1 or claim 2 by collecting the measurement signals of the respective waveforms.

Then, claim 1, claim 2 or claim 3
In this case, each small-scale station is provided with terminals for multiple analog measurement signal input channels and multiple digital measurement signal input channels, and a certain small-scale station measurement signal part of the input channel terminals has a bus bar. Input the voltage measurement signal and use the terminal of the remaining input channel of the measurement signal of the specified small-scale station and the terminal of each input channel of the measurement signal of the remaining small-scale station as the input channel of the measurement signal of the feeder current. Is practical and preferable.

Furthermore, if the master station and each small-scale station are connected by a communication network such as a LAN, it is possible to easily deal with the addition of small-scale stations accompanying the expansion of the scale of electric power equipment. It is also preferable from the viewpoint of speeding up information transmission between them.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION Regarding one embodiment of the present invention,
This will be described with reference to FIGS. FIG. 1 shows a case where the present invention is applied to an accident waveform collecting and processing device of a large-scale power facility, and the master station 6
Is the same as the master station 1 of FIG.
The main body unit 7 includes an arithmetic processing unit 7a having a microcomputer configuration having a waveform analysis processing function and a monitor display 7b.

Then, each small station 10 as a slave station for measurement input is connected to the master station 6 via a communication network 9 such as a LAN.

These small-scale stations 10 are standardized to the same number of channels, and each has a terminal AC of 16 channels of CH1 to CH16 for analog measurement signals and a terminal CI of CH1 to CH32 of 32 channels of digital measurement signals. In addition,
Each small-scale station 10 is distributed and arranged in each electric station of the electric power system.

Next, each small-scale station 10 is connected to stations A, B, and C.
, Station A is set as a predetermined small-scale station 10 for obtaining a common bus voltage waveform of each small-scale station 10.

When the power system is the two systems of A and B, 8 channels (= 2 × 4) of the analog measurement signal of station A
CH) is a common bus voltage measurement signal for each small station 10,
That is, it is assigned to each of the U-phase, V-phase, W-phase, and zero-phase analog measurement signals of the bus voltage of both systems, and the remaining 8 channels of station A and the remaining small stations 10 of station B, station C, ... 16 channels of the analog measurement signal of are assigned to analog measurement signals such as the U-phase, V-phase, W-phase and zero-phase analog measurement signals of each feeder current.

In this case, the analog measurement signals of the respective phases of the bus voltage of both systems are not input to the small stations 10 other than the B station, the C station, ... All 16 channels of the measurement signal can be assigned to the acquisition of the analog measurement signal other than the bus voltage such as the feeder current, and each input channel of the analog measurement signal of the small-scale station 10 of the entire device can be effectively used.

In the case of the electric power equipment of two lines and 23 feeders, the conventional apparatus of FIG. 8 requires (23 ÷ 2≈) 12 small-scale stations 2 ', but in the apparatus of this embodiment, the station A is .. are allocated to 2 feeder currents, and the remaining B stations, C stations, ... Are respectively allocated to 4 feeder currents at the maximum, so [{1+ (23-2) ÷ 4} ≈] 7 small stations 1
It is only necessary to provide 0, the number of required small-scale stations 10 is almost halved, and significant cost reduction can be achieved.

The measurement signal of each channel of station A is
When the digital measurement signal is only the trip contact signal, it is specifically set as shown in Table 1 below.

[0041]

[Table 1]

At this time, the measurement signals of the channels of the small-scale stations 10 other than the A station, such as the B station and the C station, are set as shown in Tables 2 and 3 below.

[0043]

[Table 2]

[0044]

[Table 3]

Next, in order to synchronize the acquisition timing of the measurement input of each small-scale station 10, in this embodiment, each small-scale station 10 is provided with a GPS receiving antenna 11 as shown in FIG. GPS satellite 1 for timing control of 10
The time information of 2 is used.

Further, the small station 10 near the accident point detects an accident and issues a start command for signal acquisition, and sends this start command to another small station 10 via the dedicated cable 13 between the stations, When a system fault occurs, each small-scale station 10 simultaneously acquires each measurement signal.

By the way, each small-scale station 10 is formed as shown in FIG. 2, and the measurement signals of the respective terminals AC and CI are input to the interface circuit 14 for measurement.

Further, the reception information of the antenna 11 is demodulated by the GPS receiving circuit section 15, and the activation command from the cable 13 is taken into the interface circuit 16 for command input / output.

Further, each small-scale station 10 has an arithmetic processing unit 17 having a microcomputer configuration.
7 executes the measurement collection process program in step Q ₁ to Q ₁₂ of FIG. 3, for example.

Then, each time the time information is received by the receiving circuit section 15, the built-in clock section is adjusted and corrected on the basis of the received time information in steps Q ₁ and Q ₂ to take in the measurement signal. Synchronize the sampling signal.

Further, the system fault is monitored and detected by monitoring the change of each measurement signal of the interface circuit 14, and when the system fault is detected from the change of the busbar or the breaker trip contact of each feeder in step Q ₃ , the step is detected. From Q ₃ to step Q ₄ , the start command is issued, and the start command is immediately and automatically transmitted to another small-scale station 10 via the dedicated cable 13.

Further, the process shifts from step Q ₄ to step Q ₅ to take in each measurement signal of the interface circuit 14, and at step Q ₆ , each measurement signal taken in is automatically transmitted to the master station 6 via the network 9. To transmit.

On the other hand, when a start command from another small-scale station 10 is input to the interface circuit 16 through the dedicated cable 13, the process proceeds from step Q ₃ to step Q ₇ to step Q ₈ and the interface is started. Each measurement signal of the circuit 14 is acquired.

At this time, since the start command is transmitted and received instantly via the dedicated cable 13, and the time information of each small station 10 that determines the sampling timing of the measurement signal is synchronized, After issuing the start command, the small-scale station 10 synchronously captures each measurement signal by sampling the measurement signal based on each time information.

In addition, the antenna 11 of each small-scale station 10,
By synchronizing the operation timing of each small-scale station 10 based on the time adjustment of steps Q ₁ and Q ₂ of the arithmetic processing unit 17 and the synchronization of the measurement signal acquisition timing of steps Q ₅ and Q ₈ based on the start command. In the event of an accident in the power system, a means for causing each small-scale station 10 to capture the measurement signal of each measurement input channel in synchronization with each other is formed.

Next, at step Q ₈ to step Q ₉ , it is judged whether or not the own station is the A station. If it is the A station,
In order to give a measurement signal of the bus voltage to the master station 6, step Q
_{In step 10} , the measurement signals are automatically transmitted unconditionally to the master station 6 via the network 9.

The steps Q ₉ , Q of the arithmetic processing section 17
Treatment of _10, provided at a predetermined small station (A station) 10, when an accident occurs in the power system, and automatically transmitted to the master station 6 crowded preparative measurement signal of each input channel including a measurement signal of the bus voltage Means are formed.

If the station is not station A, step Q
_{The process} moves from ₉ to step Q ₁₁ and waits for the reception of the transmission request from the master station 6.

That is, when each small-scale station 10 unconditionally sends each measurement signal to the master station 6, a large amount of signals (information) pass through the network 9 at one time, and the network 9 or the like has an unnecessarily large capacity. However, it is necessary to use a CPU having a very high processing capacity for the master station 6, which is not preferable in terms of cost reduction.

Therefore, in this embodiment, with respect to the small-scale station 10 excluding the station near the accident point and the station A for measuring the bus voltage, only the station that has acquired the measurement signal necessary for printing out the accident waveform or the like is the master station 6. Selected by those stations 10
Only for the request, a data request (a request to transmit the measurement signal of each input channel) is sequentially transmitted from the master station 6 via the network 9.

Then, the small-scale station 10 receiving this data request shifts to step Q ₁₂ from step Q ₉ to step Q ₁₁ in FIG. Send to station 6 sequentially.

The steps Q ₁₁ , Q of the arithmetic processing section 17 are
_12, the incoming data requests, means for transmitting the taken on the basis of the start command to the measurement signal of each input channel to the master station 6 is formed.

On the other hand, the master station 6 executes the waveform processing program of FIG. 4 by the arithmetic processing section 7a provided in the main body unit 7.

Then, when an accident occurs in the power system, when each measurement signal voluntarily transmitted from the station near the accident point and the small station 10 as the A station is received, the process goes from step S ₁ to step S ₂ in FIG. migration to identify the bus or feeder fault point, based on the particular, the step S _3, selects and determines an accident waveform group corresponding to the fault point.

That is, for example, the setting information of five fault waveform groups of groups 1 to 5 in Tables 4 to 8 below can be rewritten in the memory of the arithmetic processing unit 7a according to the number of feeders in the power system. It is written in advance and retained.

[0066]

[Table 4]

[0067]

[Table 5]

[0068]

[Table 6]

[0069]

[Table 7]

[0070]

[Table 8]

The setting information of these accident waveform groups is as follows:
The voltage and current waveforms that need to be checked when an accident occurs are grouped by accident point, and the group of accident-related groups including the bus voltage waveform of each small station and the bus or feeder where the accident occurred. This is information that specifies the current waveform of the related feeder as a required accident waveform for each accident point.

Station A underlined in Tables 4 to 8
C: CH1-CH4, A station AC: CH5-CH8 are measurement signals of the A and B bus voltage of the A station as a common bus voltage of each small station 10.

Further, the circles in Tables 4 to 8 indicate the input channels of the trip contact signal of the small-scale station 10 near the accident point which has changed due to the accident, and the small change caused by the waveform analysis processing function. From the scale station 10 and the input channel, the step S ₂ is specified and the step S ₃ is selected.

Next, the process proceeds from step S _{3 of} FIG. 4 to step S ₄ , and the small station 10 required for collecting the measurement signals of the selected accident waveform group, and the remaining stations except the station near the accident point and station A The data request is transmitted to the small-scale station 10.

Then, in steps S ₅ and S ₆ , the measurement signals of the related feeders necessary for displaying / printing out the accident waveform of the selected accident waveform group are received and collected.

Incidentally, the steps S ₂ , S _{3 of the} arithmetic processing unit 7a
By this, when an accident occurs in the power system, a means for identifying the accident point by the waveform analysis processing function and selecting the corresponding accident waveform group is formed, and the setting information of the selected accident waveform group is set in steps S ₄ and S _5. Of the small stations 10 that collect measurement signals based on the small stations near the accident point, A
Means for sequentially outputting the transmission requests of the measurement signals of the respective input channels are formed in the remaining small stations 10 excluding the stations.

Since the measurement timing of each small-scale station 10 is synchronized, the terminals AC and C of CH1-CH4 of station A are
The common A and O bus voltage of each small-scale station 10 based on the measurement signal of the terminal AC of H5-CH8 and the current waveform of each feeder of the selected fault waveform group are synchronized.

Next, in step S ₇ , each collected measurement signal is edited to create display / print data of the accident waveform of the selected group.

Then, in step S ₈ , these data are supplied to the printer 8 and the accident waveforms of the selected accident waveform group in FIG. 5 are printed out.

Incidentally, steps S _{4 to} S ₈ of the arithmetic processing section 7a.
According to the setting information of the selected fault waveform group, the measurement signals of the common bus voltage and the measurement signals of the feeder current of the group of related feeders are selectively collected from the measurement signals of the input channels of the small stations 10. Then, a means for printing out the waveform of each collected measurement signal as an accident waveform is formed, and by a part of this means, an accident waveform is generated based on the received measurement signal of the bus voltage of station A when an accident occurs in the power system. Means are formed for forming the waveform of the bus voltage therein.

Then, as is clear from FIG. 5, station A
The measurement signal of the bus voltage of the terminals AC of CH1-CH4, CH5-CH8 is used as the measurement signal of the common bus voltage of each small-scale station 10, and the common bus voltage waveform and the required feeder current number according to the fault point are set. The combined accident waveform can be printed out on one sheet of paper Px.

In this case, instead of printing a waveform by changing the paper for each small-scale station as in the conventional case of FIG. 9,
Moreover, since the bus voltage waveform based on the measurement signal of station A forms a common bus voltage waveform for each small station 10, each small station 10 other than station A allocates all 16CH of the analog measurement signal to the feeder current. Can be one small station 1
The measurement signal of the feeder current of 4 feeders, which is twice as large as the conventional one, can be input to 0 and processed, and about half of the conventional small-scale station 10 can collect the accident waveform of the large-scale equipment.

Therefore, when the slave station is formed of a plurality of small-scale stations 10 to reduce the cost, the number of the small-scale stations 10 required for collecting the accident waveform of the large-scale equipment is made much smaller than the conventional one. The accident waveform collecting and processing device can be constructed at an extremely low cost.

Further, since each measurement signal is transmitted to the master station 6 only from the small station 10 necessary for displaying / printing out the accident waveform of the selected accident waveform group, the network 9
And the master station 6 does not handle a large number of signals, and the master station 6 sends a data request for the measurement signals of the remaining small stations 10 except the station near the fault point and the station A in the selected fault waveform group. Since the data is sequentially collected in the master station 6, the load on the network 9 and the master station 6 is further reduced, and the network 9 and the master station 6 can be formed at low cost.

The small stations 10 and the master station 6 are connected to each other via LAN.
Since they are connected by the network 9 etc., there is an advantage that the connection between the stations is easy and the information can be transmitted at high speed, and the small-scale station 10 can be easily added.

By the way, the number of input channels of the analog measurement signal and the digital measurement signal of each small-scale station 10 is not limited to the above-mentioned form.

The small-scale station may have at least an analog measurement signal input channel as a measurement signal input channel.

Further, the measurement signal of the bus voltage and the measurement signal of the current waveform of the feeder may be digital measurement signals, and in this case, the same effect as in the case of the above embodiment can be obtained.

Next, the sampling synchronization of the measurement signal of each small-scale station 10 may be performed by any method, and instead of using the time information of the GPS satellites 12 as in the above embodiment, for example, each small-scale station may be synchronized. Any one of 10 is set as a master station, and the remaining small stations 1 to 10 serve as slave stations.
It is also possible to send a common sampling signal to 0 and synchronize the sampling of each small-scale station 10 with this common sampling signal.

Also, from the station near the accident point to another small station 10
The start command given by may be a contact signal or the like, and may be given via a communication network instead of the dedicated cable 13.

Any communication network may be used for the transmission of the measurement signal from each small-scale station 10 to the master station 6 and the transmission of the above-mentioned start command, such as a public telephone line network. It may be. Further, the communication network may be wired or wireless.

The accident waveform is displayed on the monitor display 7 of the master station 6.
b, and when printing out with the printer 8,
The quality of various relay operations may be determined from the accident waveform, and the accident phase, accident feeder, accident duration, etc. may be displayed / printed together.

[0093]

The present invention has the following effects. First,
In the case of claim 1, when an accident occurs in the power system, the master station 6 selects an accident waveform group according to the accident point and is required to print out the accident waveform of the selected group based on the setting information of the selected group. Only for small stations 10,
You can collect and edit the measurement signals of each input channel and print out the fault waveform of the selected group.

In this case, the accident waveform is for all small stations 1.
Waveforms of measurement signals collected from 0 are not printed out separately for each small station 10, but each small station based on the measurement signal of any one small station (for example, A station) 10. It is formed by collectively printing out 10 common bus voltage waveforms and current waveforms of a group of related feeders obtained from measurement signals of one or a plurality of small stations.

Therefore, it suffices to input the measurement signal of the bus voltage to only one of the small stations 10 and use the bus voltage waveform of the measurement signal as a common bus voltage waveform, and as a result, the remaining small stations. Since it is not necessary to input a measurement signal of the bus voltage to 10, it is possible to effectively use the input channel of the small-scale station 10 of the entire apparatus, and the number of the small-scale stations for the large-scale power equipment can be significantly reduced as compared with the conventional one. Therefore, the input channel of each small-scale station 10 can be effectively used to significantly reduce the size of the device and reduce the cost.

Next, in the case of claim 2, when an accident occurs in the power system, each small-scale station 10 synchronizes with each other and takes in the measurement signal of each input channel. At this time,
Only a predetermined small station (A station) 10 takes in a measurement signal of the bus voltage and automatically transmits it to the master station 6, and the master station 6 has an accident due to the measurement signal of the bus voltage of the predetermined small station 10. Form a common bus voltage waveform for each small station 10 in the waveform.

In this case, the measurement signals of the small stations 10 are simultaneously acquired in synchronization, and the common bus voltage waveform and the current waveforms of the group of related feeders in the accident waveform to be printed out are synchronized and predetermined. It is possible to provide a fault waveform collection / processing device having a specific configuration capable of obtaining the effect of claim 1 by inputting the measurement signal of the bus voltage only to the small-scale station 10.

Furthermore, in the case of claim 3, when a fault occurs in the power system, the measurement signal of the common bus voltage and the measurement signal of the feeder current at the fault point are immediately input to the small stations. Although it is automatically transmitted from 10 to the master station 6,
The measurement signals of the feeder currents of the remaining related feeders of the selected fault waveform group are sequentially sent from the remaining small stations 10 to the parent station 6 on condition that the transmission request from the parent station 6 is received. Therefore, the transmission of the measurement signal from each small-scale station 10 to the master station 6 is not concentrated, and the processing load on the master station 6 is prevented from increasing. The accident waveform can be printed out in the same manner as in claim 1 or claim 2 without significantly increasing the amount of information and without increasing the processing load of the master station 6, and the input of each small-scale station 10 can be performed. Channels can be used effectively.

In the case of claim 4, each small station 10
In addition, terminals AC of a plurality of input channels of analog measurement signals and terminals CI of a plurality of input channels of digital measurement signals are respectively provided to terminal AC of some input channels of measurement signals of a predetermined small station 10. The measurement signal of the bus voltage is input, and the measurement signal of the feeder current is input to the terminal AC of the remaining input channel of the measurement signal of the predetermined small-scale station 10 and the terminal AC of each input channel of the measurement signal of the remaining small-scale station 10. Since each of the small-scale stations 10 has an input channel of an analog measurement signal and an input channel of a digital signal, the same effects as those of claim 1, claim 2 or claim 3 can be obtained. .

Next, in the case of claim 5, since the master station 6 and each small-scale station 10 are connected by the communication network 9 such as LAN, it is possible to easily deal with the increase or decrease of the small-scale station 10. In addition, there is an advantage that information transmission between stations can be speeded up.

[Brief description of drawings]

FIG. 1 is a block connection diagram according to an embodiment of the present invention.

FIG. 2 is a detailed block connection diagram of the small-scale station in FIG.

3 is a flowchart for explaining the operation of the small-scale station in FIG.

FIG. 4 is a flowchart for explaining the operation of the master station of FIG.

5 is a printed out accident waveform diagram of FIG. 1. FIG.

FIG. 6 is a block connection diagram of an example of a conventional device.

FIG. 7 is a printed out accident waveform diagram of FIG. 6;

FIG. 8 is a block connection diagram of a conventional device in which a slave station is formed by a plurality of small stations.

FIG. 9 is a printed out accident waveform diagram of FIG. 8;

[Explanation of symbols]

6 parent station 8 printers 9 network cable 10 small stations 11 GPS receiving antenna AC analog measurement signal terminal CI digital measurement signal terminal

Claims (5)

[Claims] 1. When a power system accident occurs, a master station having a waveform analysis processing function collects the measurement signals of the respective input channels taken in by the slave stations for measurement input to collect the bus voltage waveform of the power system and In a fault waveform collecting and processing apparatus that prints out fault waveforms including current waveforms of each feeder, the slave stations are a plurality of small-scale stations whose input channels for measurement signals are standardized to a fixed number for small-scale power equipment. The master station holds setting information of a plurality of fault waveform groups that designate the common bus voltage waveform of each of the small stations and the current waveform of a group of related feeders related to the fault as the fault waveform in the master station. Means, a means for identifying a fault point by the waveform analysis processing function and selecting a corresponding fault waveform group when a power system fault occurs, and the setting information for the selected fault waveform group. Based on, from the measurement signal of each input channel of each small-scale station, selectively collects the measurement signal of the common bus voltage and the measurement signal of the feeder current of the group of related feeders, And a means for printing out a waveform as the accident waveform. 2. An input channel of a predetermined small-scale station is set as an input channel of a bus voltage, a measurement signal of the bus voltage is input only to the predetermined small-scale station, and an accident occurs in a power system. In this case, a means for allowing each small-scale station to capture the measurement signal of each input channel in synchronization with each other, and a means provided in the predetermined small-scale station, in case of a power system accident, the bus bar Means for automatically transmitting a measurement signal of each input channel including a measurement signal of voltage to the master station, provided in the master station, when an accident occurs in the power system, of the bus voltage of the predetermined small-scale station received Depending on the measurement signal,
The fault waveform collecting and processing apparatus according to claim 1, further comprising means for forming a common bus voltage waveform for each of the small stations. 3. When a power system accident occurs, a small-scale station near the accident point transmits a signal acquisition start command to each of the remaining small-scale stations based on the detection of the accident, and at the same time, the input channel of its own station is input. The measurement signal is automatically transmitted to the master station, and the measurement signal of each input channel of the own station including the measurement signal of the bus voltage is received by the predetermined small-sized station based on the detection of the accident of the own station or the arrival of the start command. Of the small stations that automatically transmit to the master station and the measurement signals are collected based on the setting information of the selected fault waveform group, the small stations near the fault point, the predetermined station The remaining small stations, excluding the small stations, are provided with means for sequentially outputting the transmission request of the measurement signal of each input channel, and when the small station receives the transmission request, the start command is issued. Each input captured based on Accident waveform acquisition system according to claim 1 or claim 2, wherein further comprising means for transmitting the measurement signal of Yan'neru to the master station. 4. Each small-scale station is provided with terminals of a plurality of input channels for analog measurement signals and terminals of a plurality of input channels for digital measurement signals such as contact signals, etc. Input the measurement signal of the bus voltage to the terminals of some input channels, and input it to the terminals of the remaining input channels of the measurement signal of the specified small-scale station and to the terminals of the respective input channels of the measurement signals of the remaining small-scale stations. The apparatus for collecting an accident waveform according to claim 1, 2 or 3, wherein a measurement signal of a feeder current is input. 5. The accident waveform collecting and processing apparatus according to claim 1, wherein the master station and each small-scale station are connected by a communication network such as a LAN. .