JPH0734388B2 - Surge measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a surge measuring device for storing a surge waveform generated in a power system or the like due to a lightning strike or the like.

(Prior art) Conventionally, as this type of equipment, a detector such as a shunt or Rogowski coil is provided in a steel tower, etc., and the voltage waveform generated by lightning current is converted into an optical signal by a light emitting diode etc. , Optical to electrical conversion, converted to digital data by a commercially available waveform digitizer and stored. To perform this measurement automatically, connect the cpu and digitizer with a bus such as GPIB, RS232C, etc., and control the digitizer and read the waveform data from cpu.
It is recorded and saved on the cpu disk along with the time when u read.

(Problem to be Solved by the Invention) In the above-mentioned conventional technique, when the waveform digitizer is triggered and waveform data is obtained, data is transferred to the cpu each time, so the surge waveform generated during data transfer is removed. It will be. Data transfer time is high (~ 100KB /
Even if the S) GPIB bus is used, it takes about 1 second to send 10-bit 4096-word waveform data. On the other hand, about half of the normal lightning strikes are multiple lightning strikes, and the interval between them is about 3ms to 300ms. Therefore, the conventional technique cannot catch the waveform of the multiple lightning.

On the other hand, due to the recent technological progress of digitizers, the waveform memory is divided and used, the waveform data is taken in several frames, and the function automatically waits for the next trigger after each frame is written (auto advance function and Called) appeared. If this is used, it is possible to catch the waveform of multiple thunder, but since the digitizer side does not have a time storage function, the time when the surge occurred cannot be stored accurately.

The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a surge measuring device capable of storing surges of multiple lightnings and accurately storing their respective times of occurrence.

[Structure of Invention]

(Means for Solving the Problems) In order to achieve the above-mentioned object of the present invention, in the present invention, a digitizer for converting a surge output waveform from a sensor into digital data and sequentially storing it, and a digital signal at the time of triggering the digitizer are received. There is provided a surge measuring device comprising a time memory device for sequentially storing the time and a main CPU for reading out and combining the waveform data stored by the digitizer and the time data stored by the time memory device and storing them in a disk.

(Operation) With the above configuration, the digitizer having the auto advance function stores the waveform of multiple lightnings, and the time memory operates in parallel in response to the digital signal generated at the trigger time, so that the trigger time is accurate. When the waveform data is written to the full capacity of the digitizer, the time data can be sent together when the waveform data is sent from the digitizer to the main cpu.

(Embodiment) An embodiment of the surge measuring apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall configuration of an embodiment of the surge measuring device of the present invention. The surge waveform detected by the sensor 1 is converted into digital data by the digitizer 2 and stored in the memory. A trigger signal generated at the time of triggering the digitizer 2 is input to the signal input unit 4-1 of the time storage device 4 via the trigger signal line 3. Built-in cp in time memory 4
It has u4-2, memory 4-3, timer 4-4, and data transmission interface 4-5. The signal input section 4-1 latches the trigger output signal from the digitizer 2. Built-in
As shown in the flowchart of FIG. 4, the cpu4-2 determines whether or not a trigger is applied by checking the latched state of the signal input section 4-1 (B), and if any channel is triggered, the timer 4 is activated. -4 is read (C), the timer value read in the buffer on the memory 4-3 of the channel which is trigger-latch is written, and the pointer is pushed one by one (D), and the channel of the signal input unit 4-1 is read. Clear the latch of and prepare for the next trigger signal input. (E) The format of the time buffer on the memory 4-3 is the third
As shown in the figure, time data is stored for each channel.

Data transmission interface 4-5 is GPIB or RS232C
It sends and receives data to and from the main cpu5 via the data transmission bus 6 such as "initialization" from the main cpu5.
Receive commands such as "time data read out", main cp
Used for sending time data to u5. (FIGS. 4 (F), (G), (H)) The data transmission bus 6 is also used for data transmission / reception between the digitizer 2 and the main cpu 5.

The flow chart of the main cpu5 is as shown in FIG. 2, in which the initialization command for the digitizer 2 and the time memory 4 is transmitted via the data transmission bus 6 (A, B), and the clock 5-1 built in the main cpu 5 is used. The time at the start point is read out and stored in the memory (C). Wait until the digitizer 2 of any channel is full of capacity or a predetermined time has elapsed from the start time (D), and the trigger time data is digitized from the time storage device 4 via the data transmission bus 6. Waveform data is read from 2. (E, F) Trigger time data represents the elapsed time from the start time, so add it to the time at the start time stored in memory to convert it to time, and then waveform data for each channel and each frame. It is stored in a file on the disk 5-2 of the main cpu in combination with (G).

After the start command is sent by the main cpu 5, the digitizer 2 and the time memory 4 can record the waveform data and the time simultaneously in parallel, so that the waveform recording and the time recording can be performed even in the case of multiple lightning. You can record accurately.
According to the results of the actual prototype, the trigger data can be accepted at time intervals of about 1 ms, and the time resolution is 1/100.
Seconds (= 10ms) were possible. On the other hand, the digitizer 2 is currently commercially available as rtd manufactured by Sony Tektronix Inc.
-710 type has a frame interval of about 3ms during auto advance, so it can be measured sufficiently from the data of multiple lightning.

FIG. 5 shows the overall construction of another embodiment of the surge measuring apparatus according to the present invention.

The present embodiment has a trigger unit 7 that outputs a trigger pulse when a trigger condition is observed in any channel upon receiving sensor signals for three channels. The trigger unit 7 outputs the trigger pulse for three channels. External trigger input and the time storage device 4.

Normally, the power system circuit is a three-phase circuit, and surges that enter the substation due to lightning strikes have a complicated appearance due to mutual induction, etc., so it is meaningful to record waveforms for three phases at the same time. The embodiment is effective in such a case.

FIG. 6 shows the configuration of the time storage device 4 of another embodiment of the surge measuring apparatus according to the present invention. The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 6, the trigger signal line 3 is input to the up-count input section of the up-down counter 4-6 and advances the count value of the up-down counter 4-6 by one when the trigger pulse rises. On the other hand, the down-count line 4-7 is connected to the down-count input section of the up-down counter 4-6, and the up-down counter 4 is activated by the rising edge of the down-count pulse supplied from the built-in cpu 4-2 via the internal bus 4-8. The count value of -6 is decremented by 1. The count value of the up / down counter 4-6 can be read into the built-in cpu 4-2 via the count value output line 4-9.

As shown in the flowchart of FIG. 7, the built-in cpu 4-2 determines whether or not a trigger is applied by looking at the count value of the up / down counter 4-6 (B), and if any channel is triggered. Read the timer 4-4 (C), write the timer value read into the buffer on the memory 4-3 of the channel that triggered (count value is not 0), and recommend the writing points one by one (D ), The up / down counter 4-6 of the channel
A down count pulse is output (E), the presence or absence of a count value is checked again (J), and if the count value is not 0, (D), (E), and (J) are repeated until it reaches 0.

With this configuration, when used in combination with the digitizer 2 that has a faster auto-advance function, a trigger pulse that is faster than the processing speed of the built-in cpu4-2 and has a short interval is input from the trigger signal line 3. Even
Since the count of the trigger pulse depends on the hardware processing of the up / down counter 4-6, which is faster, the omission of the trigger pulse can be avoided.

In the above embodiment, the timer 4-4 in the time memory 4 has been described as measuring elapsed time, but it goes without saying that it may be a clock capable of measuring time.

〔The invention's effect〕

According to the surge measuring device of the present invention, it becomes possible to accurately measure the surge waveform including multiple lightnings and the time of occurrence, which greatly contributes to the level of the lightning observation, the surge observation, and the accident analysis of the power system. There is expected.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a surge measuring apparatus showing an embodiment of the present invention, FIG. 2 is a flow chart of a main cpu of the surge measuring apparatus showing an embodiment of the present invention, and FIG. The figure which shows the time buffer table of the time memory | storage device of the surge measuring device which shows an Example, FIG. 4 is the flowchart figure of the time memory | storage device of the surge measuring device which shows one Example to this invention,
FIG. 5 is an overall configuration diagram of a surge measuring device showing another embodiment of the present invention, FIG. 6 is a configuration diagram of a time storage device of another embodiment of the present invention, and FIG. 7 is another implementation of the present invention. It is a flowchart figure of the example time storage device. 2 ... Digitizer, 3 ... Trigger signal line, 4 ... Time memory, 5 ... Main cpu, 6 ... Data transmission bus, 7 ... Trigger unit.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Narimitsu Okabe 2-4-1, Nishitsujigaoka, Chofu-shi, Tokyo Within TEPCO (72) Inventor Masahiro Suga 2-1-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Stock company Toshiba Hamakawasaki factory (56) References JP-A-62-186484 (JP, A)

Claims (1)

[Claims] 1. A digitizer for converting a surge output waveform from a sensor into digital data and sequentially storing the digitized data, a time memory for sequentially storing the time by receiving a digital signal at the time of the trigger of the digitizer, and the digitizer. A surge measuring device comprising: a main CPU that reads out waveform data and time data stored in the time memory and combines the data, and stores the data on a disk.