JPS6318409B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a digital protection relay device.

In the field of protection relays, digital protection relay devices using microcomputers and the like are being put into practical use in place of conventionally used analog protection relay devices.

The configuration of this digital protection relay device is basically configured such that the accident detection relay element microcomputer and the main relay element microcomputer are the minimum units due to reliability requirements.

FIG. 1 shows the basic configuration described above. In the figure, 1 indicates an accident detection relay element microcomputer (hereinafter referred to as FD element microcomputer), and 2 indicates a main relay element microcomputer (hereinafter referred to as M element microcomputer).

Signals 7FD and 7M indicating the voltage, current, and equipment status of a system (not shown), as well as information from the other microcomputer (from the perspective of the FD element microcomputer 1, this refers to the M element microcomputer 2) are transmitted to each signal line 6FD,
The signals are taken in from the input units 1FD and 1M of the respective microcomputers 1 and 2 via the microcontrollers 1 and 6M.

Here, FD input signal 7FD and M input signal 7M
may be of different types or may be the same.
Also, the signal on the FD relay information signal line 6FD is the same as the signal output from the output section 3FD to the output relay coil 4FD, and the signal on the main relay information signal line 6M is output from the output section 3M to the output relay coil 4M. It is the same as the signal that is transmitted.

Each piece of information captured in this way is sent to the calculation unit 2FD,
Calculations are made according to the programs of the relays stored in 2M, and the results are sent to the output parts 3FD and 3FD.
It is output to the outside through 3M.

That is, the outputs of the FD element and M element microcontrollers 1 and 2 are output from the output relay coils 4FD and 4M.
and contacts 5FD and 5FD are connected according to the relay calculation results.
Make 5M and give a trip command to the breaker.

FIG. 3 is a flowchart illustrating the operation of the conventional digital protection relay described above.

Regarding the FD element microcomputer 1 side, first, in step 11, the signal on the signal line 6M and the external signal 7FD are taken in as inputs. step
At step 12, relay calculation is performed according to a predetermined relay program. In step 13, the calculation result is compared with a preset setting value, and based on the comparison result, it is determined whether or not to operate the relay.

In other words, if the set value > calculated value, step 14
If the set value is less than the calculated value, proceed to step 15. In steps 14 and 15, the results are transmitted to the digital output section 3FD to control the relay. for example,
When the relay is operating, it transmits and outputs a "1" level signal, and when it is not operating, it transmits and outputs a "0" level signal.

When performing automatic inspection on such a digital protection relay device, in order to respond to accidents, the FD element microcomputer is kept online while the M element microcomputer is being inspected, and conversely, the M element microcomputer is kept online while the FD element microcomputer is being inspected. It is necessary to remain online.

Incident response means that when a system accident occurs during an automatic inspection of equipment, it is necessary to respond to an accident while the inspection is not in progress.
An accident is detected when an element kept online is activated, the inspection is interrupted, and the device is restored to its original protective function.

That is, in FIG. 1, for example, when the FD element microcomputer 1 is inspecting, the M element microcomputer 2
While M element microcomputer 2 is inspecting, FD element microcomputer 1
Accident response measures must be activated according to the following.

Signal lines 6M and 6FD in FIG. 1 are provided for this purpose. Since the M element microcomputer and the FD element microcomputer are each inspected independently in this way, for example, the M element microcomputer 2 in FIG.
During inspection, signal line 6FD will be used for accident response notification. However, the other signal line 6M
In this case, it does not function meaningfully and becomes a blind spot for inspection.

That is, even if an item is set during the inspection step of the M element microcomputer 2 to give a simulated accident response signal from the M element microcomputer 2 to the FD element microcomputer,
The M element microcomputer 2 cannot determine whether the signal has normally arrived at the FD element microcomputer.

Therefore, even if the information signal line 6M has a disconnection failure, this cannot be discovered during inspection. Therefore, even if it becomes necessary to respond to an accident while the FD element microcomputer 1 is being inspected, there is an inconvenience that this becomes impossible. In exactly the same way, during inspection of FD element microcomputer 1, signal line 6FD
There is an inconvenience that this becomes a blind spot.

The present invention was proposed in order to overcome the above-mentioned drawbacks, and it also makes it possible to inspect the task-crossing signal lines 6M and 6FD between the two element microcomputers, and when a defect is detected, to notify that fact. The purpose is to improve the reliability of the device by making it possible to perform trip locks.

FIG. 2 shows an embodiment of the present invention. The difference from FIG. 1 is that each of the FD element microcomputer 1 and the M element microcomputer 2 is provided with inspection control sections 8FD, 8M and interlocking inspection signal lines 9FD, 9M.

Each inspection control unit has the following functions: (1) A function to provide inspection simulation data, etc. to the calculation unit of the other microcomputer via the inspection signal line, and (2) A function to apply the calculation results based on the simulation data from the other microcomputer to its own calculation. (3) Notifies the other microcomputer via the output section that it is undergoing inspection, and locks the device in the event of an abnormality. The addition of such structural functions results in the following differences in operation.

First, a signal during inspection of the M element microcomputer 2 is inputted from the inspection control section 8M of the M element microcomputer 2 to the FD element microcomputer 1 via the output section 3M via the signal line 9M. On the other hand, the M element microcontroller 2 has
The inspection signal of FD element microcomputer 1 is sent to signal line 9FD.
and by similar means.

Second, as will be described later, steps 21 to 25 shown in FIG. 4 are added to the conventionally known relay program shown in FIG.

Thirdly, the output of the newly added step 24 is given to the inspection control sections 8M and 8FD.

Next, the above-mentioned operation will be further explained with reference to the flowchart shown in FIG. The contents of steps 11 and 12 are the same as in the conventional example shown in FIG.

In step 21, it is determined that if the signal on the inspection signal line 9M of the other microcomputer 2 taken in from the input section 1FD is at the "1" level, it is determined that the inspection is in progress, and if it is at the "0" level, it is determined that the inspection is not in progress. If the M element microcomputer 2 is under inspection, in step 22, the microcomputer 2 waits for a period of time until the microcomputer 2 sends out a simulated condition signal for responding to an accident via the signal line 6M. Note that this time is known because it is set in advance.

After a predetermined period of time has elapsed, in step 23 the conditions for the signal line 6M are input through 1FD, and in step 24
to determine whether the level is "1" or "0". When the level is "1", the signal line 6M is healthy, and when the level is "0", the signal line 6M is abnormal.In step 25, the judgment result is sent to the inspection controller 8.
Give to FD.

In other words, the M element microcomputer 2 that is being inspected sets the signal on the inspection signal line 9M to "1" at the start of automatic inspection to notify the FD element microcomputer 1 that is not being inspected that it is being inspected. Next, in a predetermined and appropriate inspection step, a simulated signal for accident response is applied to the signal line 6M.
output with level "1".

In this case, the time from when the inspection signal on the signal line 6M changes from level "0" to "1" until the accident response simulation signal changes from level "0" to "1" is during inspection. Since this is a known constant time determined by the inspection process step of a certain M element microcomputer 2, if the signal is judged when the time elapses in the FD element microcomputer 1 that is not being inspected, the accident response signal line 6
This means that an abnormality in M can be detected.

That is, if the signal line 6M is abnormal due to a disconnection or the like, the scheduled signal will not be received even if this time exceeds the predetermined time, so that the abnormality can be detected.

Although it is not explicitly shown in the flowchart of Figure 4, if the duration time of the level "1" of the simulated signal for accident response is made different from the duration time of the accident response signal that is output during a normal system accident ( For example, if the signal lines 6M and 9FD are long enough, the inspection signals on signal lines 9M and 9FD will not reach level "1," but the signal lines 6M and
It is also possible to detect an abnormality in the inspection signal lines 9FD and 9M based on the fact that the accident response simulation signal on 6FD continues to be at level "1" for a predetermined period of time.

The contents of steps 13 to 15 are the same as in the conventional example shown in FIG.

With these improvements, as mentioned above, the FD relay information 6 in Fig. 2 is transmitted using the "inspection signal" given from the inspection control section of one microcomputer to the other microcomputer.
Automatic inspection can be performed without blind spots, including the FD and main relay information 6M signal lines.

For example, when the M element microcomputer 2 is being inspected, this is notified to the other microcomputer 1, so the FD element microcomputer 1 checks the newly added steps 21 to 23.
(FIG. 4), after inputting the signal of the main relay information signal line 6M, it can be given to the inspection control section 8FD in step 24.

Here, the signal on the main relay information signal line 6M has two digital levels: "1" and "0". When responding to an accident, it is determined in advance whether this level will be "1" or "0". That is, during inspection, this signal is given at a level as if an accident response had occurred.

The inspection control unit 8FD can determine whether there is a problem with the signal line 6M by monitoring the level of this signal.

Although Figures 3 and 4 show flow diagrams for the case of the FD element microcomputer 1 when inspecting the M element microcomputer 2, it is possible to deal with the case of the M element microcomputer 2 by adding steps based on the same idea. can be easily inferred from the above.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of the basic configuration of a digital protection relay, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a flowchart of a conventional digital protection relay, and Fig. 4 is a block diagram of the present invention. 1 is a flowchart of an embodiment of the invention. 1... Accident detection relay element microcomputer, 2... Main relay element microcomputer, 1FD, 1M... Input section,
2FD, 2M...Calculation section, 3FD, 3M...Output section, 4FD, 4M...Output relay coil, 5FD,
5M...Output relay contact, 6FD...FD relay information, 8FD, 8M...Inspection control section, 9M, 9FD...
...Signal line under inspection.

Claims (1)

[Scope of Claims] 1. A pair of processing devices that perform predetermined relay calculations using information from a protected object as input, means for generating a shutdown command in accordance with the logical product of the final output of each processing device, and The device is equipped with an information signal line means for supplying a part of the arithmetic processing output of each processing device to the other processing device as input information, and while one processing device is being inspected, the other processing device is kept online to prevent an accident. In a digital protection relay device configured to perform a response, an inspection signal line means for transmitting a signal indicating that one processing device is under inspection to the other processing device, and a scheduled time from transmission of the inspection signal. Later, means for transmitting a simulated condition signal for accident response from one processing device to the other processing device via the information signal line means, and means arranged in the other processing device for receiving the simulated condition signal for accident response are provided. A digital protection relay device characterized by comprising means for determining whether or not it is appropriate.