JP2635802B2 - Digital protection and control equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention records a digital protection control and measurement device, particularly, arbitrary digital data in the device by effectively utilizing a recording memory. The present invention relates to a digital protection control measurement device capable of performing the above.

(Prior Art) A technique of applying a microcomputer to a protection, control, and measurement device for a power system is well known.

Today, as the scale of electric power systems increases, the problem of increasing the number of protection, control, and measurement equipment in the system has become a problem. One solution to this problem is to provide protection, control, and measurement for a large number of protection, control, and measurement targets. There is a digital type protection control and measurement device which can make the device compact. Specifically, there are a digital relay for determining a system fault, a fault locator for locating a system fault, a system stabilizing device for stabilizing the system, and a digital oscilloscope for observing harmonics generated in the system.

The above-mentioned digital type protection control / measurement apparatus is widely applied to the operation of electric power systems at present. However, in response to this type of digital type protection control / measurement apparatus, a conventional analog type apparatus (mechanical relay, transistor type relay) is used. However, there is a problem that it is difficult to understand as compared with the response of a device using the above. As a solution to this problem, the applicant has already collected and recorded any digital data in the device,
In addition, a recording / display function is proposed so that the data is displayed as an expression method in accordance with the meaning of the data (Japanese Patent Application No. Hei.
106597). According to the function already proposed, it is possible to easily grasp the response in the device, and also to record and display the amount of system electricity input to the device, so that it can be a substitute for a conventional oscillograph.

Hereinafter, the prior art will be described using a digital relay as an example.

FIG. 7 shows the configuration of the digital relay disclosed in the above-mentioned patent application. The digital relay shown is an analog
It comprises a digital conversion unit 1, a digital operation processing unit 2, a settling unit 3, an input / output interface 4 with the outside, a bus 5, and a data collection and expression unit 10 in addition to the basic configuration. The components 1 to 4 and 10 are interconnected via a bus 5.

The analog-to-digital converter 1 is an analog filter 1
-11 to 1-1n, sampling hold unit 1-21 to 1
−2n, a multiplexer 1-3, and an analog-to-digital converter 1-4.
After holding the analog information A-1 to An in 1) at a predetermined sampling interval, the analog information is converted into a digital quantity.

On the other hand, the digital arithmetic processing unit 2 includes a CPU 2-1, a RAM 2-2,
The above-described digital quantity-converted electric quantity data is sequentially transferred to the RAM 2-2, and the CPU 2-1 uses the data and the program from the ROM 2-3 to perform various processing such as relay judgment calculation. Perform The settling unit 3 functions as an interface that converts a value set externally, such as the sensitivity of a relay or a timer, into predetermined digital data and passes it to a digital arithmetic processing unit.

The input / output interface 4 is an interface for taking in the state of the external control device such as CB information, outputting a relay operation, a return output, and a trip command to the external device.

The above is the configuration of the basic digital relay. In addition to the above, there is a data collection / representation unit 10, which is connected to the bus 5 via the interface 10-5.
0-1, RAM 10-2, ROM 10-3, I / O 10-4 and a bus 10-6 interconnecting these. Also keyboard
E1 and CRT device E2 are the data collection and expression unit via I / O10-4
Connected to 10. The data collection / representation unit 10 enables recording and display of arbitrary data in the device. The function of the data collection and expression unit is described below.

First, the keyboard E1 is used to set the address (address) and the recording time information of the RAM 2-2 or the I / O 4 in which the data to be collected and recorded exists in the apparatus. The recording time information includes data collection start timing, data collection end timing, data collection interval, and the like. The number of data to be recorded is determined by the set address and the recording time information.

Next, data recording in the apparatus is performed according to the above setting contents, and the collected data is recorded in the RAM 10-2 and displayed in an appropriate expression to the outside by the CRT apparatus E2 as necessary. .

(Problem to be Solved by the Invention) The most important of the recording functions added to the digital relay described above is the number of times of recording. Especially when using as an oscillograph function to record the input electric quantity, relay operation, etc. as a start signal when a system accident occurs, considering that accidents occur frequently in a short period of time, the greater the number of records that can be recorded, the easier it is to use. I can say.

However, in general, the physical capacity of the recording memory is limited, and when the amount of data to be recorded in one recording is large, the number of times that recording can be performed is naturally reduced. When using the same hardware, if the amount of data to be recorded is fixed, the number of times that data can be recorded will be fixed, but if the input / output is diverse and the storage relay element differs for each protection target such as a digital relay Does not have the same amount of data to be recorded. For example, a bus protection device or the like has a large amount of input electricity, but a distance relay device has a small amount of input electricity. Alternatively, the amount recorded before the trip after the occurrence of the accident differs between the time-tripped device and the instantaneous trip device. Therefore,
The number of recordable times differs for each model. In addition, the allocation of the used area of the recording memory also differs.

Therefore, conventionally, when a recording function is added, it is necessary to design and set in consideration of one of the following two points.

Based on the memory capacity and the number of recording data, the number of recordable times and the allocation that can use the memory effectively are performed for each model.

The number of recordable times and the memory allocation are fixed according to the model with the largest number of recorded data. However, in such a case, design is required for each model, and labor is required, and reliability is reduced.

In the case of, it cannot be said that a model having a small number of recorded data is effectively utilizing the memory capacity. This is shown in FIG. In FIG. 8, since the number of recordable times is fixed at three times, if the number of recorded data is small, the free space in the memory is increased, and it cannot be said that the memory is utilized effectively. In this case, the optimum number of recordable times and memory allocation may be designed and set for each model as described in the above section, but this requires a great deal of labor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a digital type protection correct / incorrect measurement device that effectively utilizes a recording memory capacity and does not require labor for designing allocation of a recording memory for each device model. It is intended to provide.

[Structure of the Invention] (Means and Action for Solving the Problems) A structure for achieving the above object will be described with reference to FIG. 1. The present invention calculates the number of data to be recorded and the memory capacity for recording. It comprises a number-of-recordable-times calculating means and a memory-for-recording allocating means for allocating a use area of the recording memory.

Therefore, the number of recordable times can be calculated from the number of data to be recorded and the capacity of the recording memory, and the use area of the recording memory can be allocated using the calculation result.

(Example) Hereinafter, an example is described with reference to drawings.

The hardware configuration of the digital relay according to the present invention is the same as that shown in FIG.

The features of the present invention are realized by a program stored in the ROM 10-3, and its operation will be described below.

First, the address at which data to be recorded and the recording time information are stored from the keyboard E1 in the data storage expression section.
Enter 10 Thus, data to be recorded is determined by one recording start. As a specific means, by multiplying the number of addresses and the number of recording points corresponding to one address included in the recording time information, the number of recording target data required for one recording is obtained. From the number of data to be recorded and the memory capacity for recording, the number of recordable times is obtained by the following calculation.

[] Means an operation to round down decimal places.
For example, if the memory capacity for recording is 64 kilobytes, the number of data to be recorded is 1400, and recording of one data requires 2 bytes, It turns out that it is possible to record 23 times.

The above processing corresponds to the recordable number calculation means 11 in FIG.

Next, a means for efficiently allocating a recording memory by using the above-mentioned recordable number of times will be described. First, the area of the first recording memory is calculated by the following calculation. That is, since the number of data to be recorded is 1400 and two bytes are required to record one data, the number of bytes required for the first recording is obtained by the equation (3).

1400 × 2 bytes = 2800 bytes (3) From this, 27 from address 0 of the recording memory shown in FIG.
The area up to address 99 is secured as the twelfth recording memory. Next, the area of the second recording memory is (4)
It is calculated by the formula.

(1400 × 2) × 2 = 5600 bytes (4) From the above result, the area from address 2800 to address 5599 of the recording memory is secured as the second recording memory. In the same manner, the third and subsequent recording areas are also secured, and the area of the 23rd recording memory is calculated by the calculation of Expression (5).

(1400 × 2) × 23 = 64400 bytes (5) The above processing is the processing performed by the recording memory allocating means 12 in FIG.

As described above, according to the present embodiment, the number of recordable times is automatically calculated from the number of data to be recorded, and the allocation of the used area of the recording memory is automatically and efficiently performed according to this. It can be performed using the capacity without waste.

In the above embodiment, the calculated number of recordable times is used only for allocating the recording memory.However, the present invention is not limited to this, and the number of recordable times calculated by the above means may be displayed outside the apparatus. Good. An external display means can be realized by using a CRT E2 or the like.

Therefore, it becomes clear how many times the set number of recordable data can be recorded, and if the displayed recordable number is smaller than the required record number, the recordable data
It is also possible to reduce and set the number of data to be recorded by, for example, removing low priority data. This makes it possible to obtain the required number of recordable times, and to efficiently set the data to be recorded.

 FIG. 3 is a block diagram of another embodiment.

In this embodiment, the data collection / representation unit 10 is separated into a data collection / recording unit 20 and a data setting display unit 30. The reason is that the data collection and recording process is more
This is because high speed of CPU capacity is required. By performing the role assignment in this way, high-speed data collection and display can be performed. Here, the recordable number calculation means described in the above embodiment is processed by the data setting display unit 30, and the recording memory allocating means is processed by the data collection recording unit 20. The processing speed required for the data setting display unit is not high, but may be a general-purpose portable computer.

 The effect of this embodiment is equivalent to that of the above embodiment.

 FIG. 4 is a conceptual diagram of still another embodiment of the present invention.

According to the present embodiment, the maximum number of recordable times is maximized without impairing the basic display function such as an analog waveform, and by effectively utilizing the memory capacity for recording, as shown in the figure. recording sampling interval, continuous recording sampling period, start recording timing, recording end timing from the recorded digital data D ₁ and the recording content setting means 42-1 to 42-n set for each D _n, the according to the respective content setting means And data collecting and recording means 41 for recording digital data to be recorded.

Recording content setting means S ₁ from S _n recording sampling interval is set at t _b1 ... t _bn 'continuous recording sampling period t _a1 ... t
_an ′ recording start timing t _s1 … t _sn ′ recording end timing
According to t _e1 ... t _en , the digital data to be recorded D ₁ to D _n
Record

FIG. 5 shows a state in which the system electric quantity input to the apparatus is recorded as analog information, in which one cycle is sampled by 12 samplings.

Here, the recording start timing ts is the start signal generation time T _r
This means that recording is started before t _s before the recording, and the recording end timing means that recording is performed t _e after the start signal generation time _Tr . Also, continuous recording sampling period
t _a means a period in which recording is continuously performed for each sampling during the period from the recording start timing to the recording end timing. The recording sampling interval t _b is meant interval between successive recording sampling period. According to the present invention, the above-mentioned recording time information can be set for each digital data to be recorded, and various time information can be set according to the meaning of the digital data to be recorded.

FIG. 6 shows information in the device to be recorded when the current operated relay device outputs a trip command. AI
1, AI2, AI3 are each phase current, AV1, AV2, AV3 are each phase voltage, RY1, RY
2, RY20 are relay operation outputs, DI1, DI2, ... DI50 are device information.

The recording start signal is a trip command and before the trip command
10 after the trip command from 10 cycles (120 sampling)
The period up to the cycle (120 samplings) is the recording range. The purpose of recording is to know the accident situation before and after the trip command is generated and the related input / output information. Therefore, it is difficult to reproduce the accident waveform unless at least each phase current information AI1, AI12, AI13 records the information of each sampling. Accurate grasp of the accident situation is impossible. As described above, in the related art, information other than the phase current information, that is, information for which it is not necessary to perform every sampling recording, is also subjected to each sampling recording in this case.

 The recording capacity required in the prior art is calculated as follows.

20 cycles x 20 samplings x 76 types x 2 bytes = 3648
0 bytes (6) Assuming that the memory capacity for recording is 65536 bytes, 65536 ÷ 36480 1.79 (7) Therefore, the number of recordable times is one.

On the other hand, according to the present invention, it is possible to set necessary and sufficient recording time information for displaying the recording content for each recording information.

First, with respect to the current information AI1, AI2, AI3, a recording sampling interval t _b = 0, the recording start timing t _s = -120 sampled and set the recording end time t _e = 120 sampling. This is equivalent to every sampling record,
The result is the same as the prior art.

Next, the relay information RY1 ... RY20, the recording sampling interval t _b = 3 sampling, t _a = 1 sampling, t _s = -120, is set as t _e = 120 sampling, 3
Relay information is recorded discretely at the sampling interval. Even when recording at three sampling intervals, the relay operation itself is about three samplings, which is sufficient when displaying the recorded contents, and as a result, it becomes the same as the recording at each sampling.

Next, for the voltage information AV1, AV2, AV3, the recording sampling interval t _b = 24 samplings, t _a = 6 samplings,
With t _s = 120 and t _e = 120 samplings, six samplings are continuously recorded at 24 sampling intervals. In this example, since the purpose is to understand the failure mode related to the current differential relay, it is not necessary to record the voltage information other than the relay input amount at each sampling, and the phase relationship between the effective value and each phase at several cycle intervals is not necessary. It is enough to be able to grasp, and this can be realized by a method similar to the protection operation performed inside the digital relay if digital data of 6 samplings is continuously obtained.

For the last in the device information DI1 ... DI50, a recording start timing t _s and recording end timing t _e the same timing, so to record the device information only one sampling point. What is required as the device information is the state at the time when the trip command is generated, and it is not necessary to record every sampling.

 With the above settings, the required recording capacity is obtained.

First, for current information, 20 cycles x 12 samplings x 3 types x 2 bytes = 1440
Bytes (8) For relay information, 20 cycles x 12 samplings / 3 samplings x 20 types x 2 bytes = 3200 bytes ... (9) For voltage information, 6 consecutive samplings at 24 sampling intervals during 20 cycles Since the number of times that data can be recorded is 8, 6 samples x 8 x 3 types x 2 bytes = 288 bytes ...
... (10) For device information, 1 sampling x 50 types x 2 bytes = 100 bytes ... (1
1) The total storage capacity of the above 4 formulas is 5028 bytes, which is 65536 bytes.
If it is a byte, 65536 ÷ 5028 = 13.03 (12) Therefore, 13 recordings are possible.

As described above, in the present invention, the recording time information is set in a necessary and sufficient form according to the purpose of each recording object, so that the recording time is set to the minimum necessary recording memory capacity, and the case where each sampling recording is performed. The same purpose is achieved, and the number of recordable times can be greatly increased as compared with the conventional case.

In the above embodiment, the data collection and expression unit is implemented in one place.
There is a configuration shown in the figure.

In this embodiment, the data collection / representation unit 10 is separated into a data collection / recording unit 20 and a data setting display unit 30. The reason is that the data collection and recording process is more CP than other processes.
This is because high speed of U ability is required. By performing the role assignment in this manner, data collection and display at higher speed can be performed. Here, the recording content setting unit described in the above embodiment is processed by the data setting display unit 30, and the data collection / record allocation unit is processed by the data collection / recording unit 20. The processing speed required for the data setting display unit is not high, but may be a general-purpose portable computer.

 The effect of this embodiment is equivalent to that of the above embodiment.

[Effects of the Invention] As described above, according to the present invention, the recordable number is calculated from the number of data to be recorded and the capacity of the memory for recording, and the use area of the memory for recording is allocated. Therefore, it is possible to provide a digital protection control / measurement apparatus which is excellent in economical efficiency and reliability because the recording content setting operation becomes efficient, and at the same time, the recording memory can be effectively used while maintaining the display accuracy of the content.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing the basic concept of a digital protection control measuring device according to the present invention, FIG. 2 is a diagram showing the operation of the embodiment, FIG. 3 is a configuration example of another embodiment, FIG. FIG. 5 is a schematic diagram of another embodiment, FIG. 5 is a diagram for explaining the operation of FIG. 4, and FIG. 6 shows information in a device to be recorded when the current differential relay device outputs a trip command. FIG. 7 is a diagram showing a conventional apparatus, and FIG. 8 is a diagram showing conventional memory allocation for recording. 11 ... Recordable number calculation means 12 ... Recording memory allocation means

Claims (2)

(57) [Claims] 1. A digital protection control and measurement device for inputting an electric quantity of an electric power system, converting it into digital data, performing protection control measurement of the electric power system, and recording arbitrary digital data in the device in a recording memory. A setting for setting recording time information such as data collection start timing, data collection end timing, and data collection interval for each digital data to be recorded, and for each digital data to be recorded in accordance with the elements to be stored in the protection control measurement device. Means, the number of data required for one recording determined from the digital data to be recorded set in the setting means and recording time information for each digital data to be recorded, and the capacity of the recording memory. Recordable number calculating means for calculating the recordable number of times that can be recorded in the memory for recording, and the recordable number Recording memory allocating means for allocating a use area of the recording memory according to the number of recordable times calculated by the calculating means; and collecting predetermined digital data in accordance with the setting contents of the setting means. A digital type protection control / measurement device, comprising: data collection recording means for recording data in a predetermined use area of the allocated recording memory. 2. An electric quantity of an electric power system is sampled and held at a predetermined timing, and the stored analog quantity is converted into a digital quantity. In the digital protection control and measurement device for performing and recording arbitrary digital data in the device, the recording sampling interval, the continuous recording sampling period, the recording start timing based on the recording start signal generation time, and the recording start signal generation time as a reference. A digital protection control measurement device comprising: a setting means for setting the recording end timing for each digital data to be recorded; and a data collection and recording means for performing recording in accordance with the setting contents of the setting means.