JPH01309285A - Serge measuring device - Google Patents

Abstract

PURPOSE:To accurately record a surge of multiple lightening and the time of the generation by providing a time storing unit for storing the time with the reception of a digital signal at the time of trigger of a digitizer. CONSTITUTION:The waveform of surge detected by a sensor 1 is converted into digital data through a digitizer 2 and stored. A trigger signal generated at the trigger time of the digitizer 2 is input to a time storing unit via a trigger signal line and the trigger time is accurately recorded. At the time point when the waveform data is written in to an extent that the capacity of digitizer 2 is fully occupied, the time data is all sent in sending the waveform data to a main cpu 5 from the digitizer 2. It is thus possible to accurately measure the generation time of surge waveform including multiple lightening.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a surge measuring device for recording surge waveforms generated by lightning strikes or the like in power systems.

(Prior technology) Conventionally, this type of device installed a detector such as a shunt or Rogowski coil on a steel tower, changed the voltage waveform generated by lightning current into an optical signal using a light emitting diode, etc., and transmitted it using an optical fiber cable. After that, optical to electrical conversion is performed, and a commercially available waveform digitizer is used to convert the data into digital data, which is then stored. In addition, if you want to perform this measurement automatically, please use epLJ
A bus such as CPIB or R9232C connects the digitizer and the digitizer, and the CPU controls the digitizer and reads the waveform data.
Recorded and saved on PU disk.

(Problem to be Solved by the Invention) In the above conventional technology, data is transferred to the CPU each time the waveform digitizer is triggered and waveform data is obtained, so surge waveforms that occur during data transfer are missed. It turns out. Data transfer time is fast (~100
1Obit even when using the CPIB bus of XB/S')
It takes about 1 second to send 409e words of waveform data. On the other hand, it has been reported that about half of normal lightning strikes are multiple lightning strikes, and the interval between them is about 3ms to 300m5. Therefore, conventional techniques cannot capture the waveform of this multiple lightning.

On the other hand, with recent technological advances in digitizers, there is a function that divides the waveform memory and imports the waveform data into several frames, and automatically waits for the next trigger after each frame has been written (art advance function). A thing with a name (called) appeared. If this is used, it is possible to capture the waveform of multiple lightning strikes, but since the digitizer does not have a time memory function, it is not possible to accurately record the time when a surge occurs.

The present invention has been made to solve the problems of the prior art described above, and it is an object of the present invention to provide a surge measuring device that can record multiple lightning surges and also accurately record the time of occurrence of each surge.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object of the invention, the present invention includes a time memory device that receives a digital signal at the time of triggering of a digitizer and stores the time, and stores the time data in the main CPU. It's starting to come out even more.

(Function) With the above configuration, the digitizer with auto advance function stores the waveform of multiple lightning, and the time memory operates in parallel in response to the digital signal generated at the trigger time, so the trigger time can be stored. When the waveform data is written into the digitizer's capacity, it can be recorded accurately and transferred from the digitizer to the main CPU.
Time data can be sent all at once when transmitting waveform data.

(Embodiment) An embodiment of the surge measuring device 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, in which a surge waveform detected by a sensor 1 is converted into digital data by a digitizer 2 and stored in a memory. A trigger signal generated when the digitizer 2 is triggered is input to the signal input section 4-1 of the time memory 4 via the trigger signal line 3. Built-in c in the time memory 4
It has a PU 4-2-, a memory 4-3, a timer 4-4, and a data transmission interface 4-5. The signal input section 4-1 latches the trigger output signal from the digitizer 2. The built-in CPU 4-2 checks the latch state of the signal input section 4-1 as shown in the flowchart of Fig. 4 to determine whether a trigger is applied or not.B) If any channel is triggered, the timer is activated. Read 4-4 (C)
, write the timer value loaded into the buffer on the memory 4-3 of the channel where the trigger is latched, move the pointer one by one (D), clear the latch of the channel in the signal input section 4-1, and start the next trigger. Prepare for signal input. (E) The format of the time buffer on the memory 4-3 is as shown in FIG. 3, in which time data is stored for each channel.

Data transmission interface 4-5 is CPIB or R
Main CPU via data transmission bus 6 such as 3232C
It is used to send and receive data to and from the main CPU.
It is used to receive commands such as "initialize" and "read time data" from the main CPU 5, and to send time data to the main CPU 5. (Figure 4 (F), (G), (+1
)) Data transmission bus 5 connects digitizer 2 and main cp
It is also used for data transmission and reception between U5s.

The flowchart of the main CPU 5 is as shown in FIG.

B) The start time is read from the clock 5-1 built into the main CPU 5 and stored in the memory (C). Wait until the digitizer 2 of any channel becomes full or a predetermined period of time has elapsed from the start point (D), and then transmit the trigger time data from the time memory 4 via the data transmission bus 6 to the digitizer 2. Read the waveform data from. (E, F) Since the trigger time data represents the elapsed time from the start point, it is converted to time by adding it to the time at the start point stored in memory, and the waveform of each channel and each frame is calculated. It is combined with the data and stored in a file on the disk 5-2 of the main EPU (G).

After the main CPU 5 sends a start command, the digitizer 2 and time memory 4 can simultaneously record waveform data and time within each other at high speed, so even in the case of multiple lightning strikes, waveform recording and time recording are possible. can be recorded accurately. According to the actual prototype results, the trigger data is approximately 1
It was possible to accept data at time intervals of ms, and the time resolution was 17100 seconds (-10 ms). On the other hand, Digitizer 2 is currently commercially available, the RTD-710 model manufactured by Sony Tektronix ■, and has a frame interval of about amS during auto advance, so it can be sufficiently measured based on the multiple lightning data.

FIG. 5 shows the overall configuration of another embodiment of the surge measuring device of the present invention.

This embodiment has a trigger unit 7 that receives sensor signals for three channels and outputs a trigger pulse when a trigger condition is met in any channel.This trigger pulse is sent to a digitizer 2 for three channels. external trigger input, and input to the time recorder 4.

Normally power system circuits are three-phase circuits, and surges that enter power generation and substations due to lightning strikes, etc., exhibit complex effects due to mutual induction, etc., so it is important to record the waveforms of three phases at the same time. This embodiment is effective in such a case.

FIG. 6 shows the configuration of the time memory 4 of another embodiment of the surge measuring device of the present invention. Components that are equivalent to those in the embodiment shown in FIG. 1 are given the same reference numerals and their explanations 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 the count value of the up-down counter 4-6 is advanced by one at the rising edge of the trigger pulse. On the other hand, the down count line 4 is connected to the down count input section of the up/down counter 4-6.
-7 is connected, and internal bus 4-8 is connected from built-in CPU4-2.
The count value of the up/down counter 4-6 is decremented by one at the rising edge of the down count pulse applied via the up/down counter 4-6. 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 in Figure 7, the built-in CPU 4-2 checks the count value of the up/down counter 4-6 to determine whether a trigger has been applied (B), and if any channel is triggered, the timer is activated. Read 4-4 (C), write the read timer value into the buffer above 4-3, and advance the writing points one by one (D). , up/down counter 4- of the corresponding channel
Output a down count pulse at 6 (E) and check again whether there is a count value.C.If the count value is not 0, repeat (D), (E), and (J) until it becomes 01.

With this configuration, when used in combination with the digitizer 2, which has a faster auto advance function, trigger pulses that are faster than the processing speed of the built-in CPU 4-2 and have short intervals can be input from the trigger signal line 3. However, since the trigger pulse count can be relied on the faster node processing of the up/down counter 4-6, it is possible to avoid missing trigger pulses.

In the above embodiment, the timer 4-4 in the time storage device 4 was described as one that measures elapsed time, but it goes without saying that this may also be used as a clock that can measure time.

〔Effect of the invention〕

According to the surge measuring device of the present invention, it is possible to accurately measure surge waveforms including multiple lightning and the time of occurrence, thereby greatly contributing to improving lightning observation and surge observation and analyzing power system accidents. There is expected.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a surge ∆III constant device showing an embodiment of the present invention, Fig. 2 is a flowchart of the main CPU of the surge measuring device showing an embodiment of the present invention, and Fig. 3 is a diagram of the main CPU of the surge measuring device showing an embodiment of the present invention. A diagram showing a time buffer table of a time memory of a surge measuring device showing an embodiment of the present invention, FIG. 4 is a flow chart diagram of a time memory of a surge measuring device showing an embodiment of the present invention, and FIG. An overall configuration diagram of a surge measuring device showing another embodiment, FIG. 6 is a configuration diagram of a time memory device according to another embodiment of the present invention, and FIG. 7 is a flowchart of a time memory device according to another embodiment of the present invention. In the diagram. 2... Digitizer, 3... Trigger signal line, 4... Time memory, 5... Main CPU. 6...Data transmission bus, 7...Trigger unit. Agent Patent Attorney Nori Ken Yudo Ken Daishimaru Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] A surge measurement device that converts a surge output waveform from a sensor into digital data by a digitizer and stores it on a disk in a main CPU, which has a time memory that receives a digital signal at the time of a trigger of the digitizer and stores the time, A surge measuring device that reads the time data from the main CPU.