JPH0787661A - Protective relay, tester and testing system - Google Patents

Abstract

PURPOSE:To improve the efficiency of the decision operation of the result of a test in the test of a protective relay. CONSTITUTION:History data as test data at the time of the test of final completion as the criterion of a routine test are conserved in a storage section in a protective relay, a measured value measured by a tester is transmitted over the protective relay in the routine test, and the measured value and the history data of the storage section are compared and the deterioration of the protective relay is decided in the protective relay. Accordingly, the measured test data need not be recorded, brought back to an office, compared with previous test data severally and decided as seen in conventional examples, and decision operation is conducted efficiently while data are controlled and reduced easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention cuts off power supply when an overload or short-circuit accident occurs in a power transmission line or a distribution line which constitutes a power supply route for supplying power from a power plant to consumers. The present invention relates to a protective relay used as described above, a tester for testing the protective relay, and a test system including the same.

[0002]

2. Description of the Related Art In factories of various business establishments, for example, a protective relay used for breaking a transmission line or a distribution line is tested once a year. If there is a machine short-circuit accident in the factory and an excessive current is applied to the machine, it is dangerous.Therefore, if the current amount is detected and it becomes excessive, the output of the protective relay may cause The circuit breaker provided in the distribution line is operated to interrupt the current.

In the test of the protective relay, the tester is connected to the protective relay, a test current is applied from the tester side, and the output operation and time limit of the protective relay for the test current are checked.

In such a regular test, the test data measured by the tester is compared with the test data measured in the previous test, for example, the test data at the completion test, and the test value at the regular test is determined at the completion test. When the rate of change is not within a certain range with respect to the test value, it is determined that there is deterioration and the protective relay is replaced or maintenance is performed.

[0005]

However, the amount of the previous test data, for example, the test data at the time of the completion test, is large, and therefore it is generally stored in the office, not in the field. Therefore, the test data measured in the regular test is recorded, brought back to the office, and compared with the previous test data to judge the deterioration of the protective relay.

As described above, conventionally, it has been necessary to record a large number of measured test values one by one, bring them back to the office, and compare the judgments with each other to make a judgment, which takes time to judge the test result. There is a drawback.

The present invention has been made in view of the above points, and it is an object of the present invention to make it possible to easily determine a test result such as a periodical test in the field to improve work efficiency.

[0008]

In order to achieve the above-mentioned object, the present invention is constructed as follows.

That is, according to the present invention, the previous test data measured by the tester is stored as history data in the storage section of the protective relay or the tester, and when the test data is measured, the test data and the storage section are stored. The history data of (1) is compared with the determination section of the protective relay or the tester to determine the deterioration of the protective relay.

[0010]

According to the above configuration, the previous test data, for example, the test data at the completion test is stored as history data in the protective relay or the tester, and the test data newly measured in the periodic test is The deterioration of the protective relay will be determined by comparing with the history data.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

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

The test system of this embodiment comprises a protective relay 1 and a tester 2 for testing the protective relay 1.

The protective relay 1 includes an input unit 4 for inputting a test electric quantity from the tester 2, that is, an alternating current in this embodiment, and a transmission / reception unit 6 for transmitting / receiving information between the tester 2. ,
A CPU 8 that controls each unit and performs an arithmetic operation and the like, and that has a function as a determination unit described later, an output unit 10 that outputs by operating a relay 26 based on a command operation from the CPU 8, and various set values. Setting section 12 in which is set
And a storage unit 14 in which an operation program of the CPU 8 and various test data are stored, and in which history data described later is stored, and a test circuit unit 16 provided corresponding to the output unit 10. There is.

The output unit 10 outputs the drive signal in response to the output command signal from the CPU 8 after a predetermined delay time, the output drive circuit 18, the transistor 20 which is made conductive by the drive signal from the output drive circuit 18, and the transistor 20.
The drive coil 22 is excited by conduction of the drive coil 22, and the output contact portion 24 is turned on by excitation of the drive coil 22. The drive coil 22 and the output contact 24 form a relay 26. The test circuit section 16 is
A test contact portion 28 that is similarly operated by the drive coil 22 of the output portion 10 is provided and configured.

FIG. 2 is a partial front view showing a part of the front surface of the protective relay 1, and the tester 2 is provided on the lower portion of the front surface of the protective relay 1.
A test connector 30 for connection with is provided. In this test connector 30, a communication terminal 32 connected to the transmitting / receiving section 6 and a test terminal 34 from the test circuit section 16 are collectively arranged. The input terminal 36 connected to the input unit 4 is, as shown in FIG. 3, a test terminal below the portion of the power receiving and transforming board 38 to which the protective relay 1 is attached and where the protective relay 1 is provided. It is arranged as 40. The output terminal 42 connected to the output contact portion 24 is provided on the back surface of the protective relay 1.

The protective relay 1 is usually provided with an input terminal 3
6, a detection current is provided from, for example, a current detector provided in a power transmission line or a distribution line, and when the current value reaches a set value set by the settling unit 12, an output command signal is output from the CPU 8 for output driving. By being applied to the circuit 18, the drive coil 22 is driven and the output contact portion 24 is turned on, whereby a disconnection command signal is applied from the output terminal 42 to the breaker provided in the power transmission line or distribution line. There is.

The tester 2 has a CPU 50 for controlling each section.
And a storage unit 51 that stores an operation program of the CPU 50 and various data, a current generation unit 52 that generates a test AC current to be supplied to the protective relay 1, and transmission / reception that transmits / receives information to / from the protective relay 1. It is composed of a section 54, an input section 56 to which an output signal from the protective relay 1 is inputted, a display section 58 for displaying test result contents and the like, and an operation section 60.

Next, the operation during the test will be described.

FIG. 3 is a diagram showing a test state of the protective relay 1 by the tester 2. During the test, the current supply cable 62 from the tester 2 is connected to the test terminal 40 of the power receiving and transforming board 38 to connect the protective relay 1 to the test terminal 40. The contact confirmation cable 64 from the tester 2 is connected to the test connector 30 of FIG.

When a test current is applied from the tester 2 to the test terminal 40 during the test, the protective relay 1 operates in the same manner as in the normal operation described above, and the relay 26 whose current value exceeds the set value is activated. As a result, when the test contact portion 28 is turned on, an operation signal is applied to the tester 2 via the test connector 30 and the contact confirmation cable 64.

In this embodiment, in the regular test of the protective relay 1, the following constitution is provided so that the deterioration of the protective relay 1 can be efficiently judged.

That is, in this embodiment, the test data measured in the periodic test is compared with the test data at the time of the completion test, which is the previous test data, to determine the deterioration of the protective relay 1. The test data at the time is stored in the storage unit 14 of the protective relay 1 as history data indicating the history of the test.
On the other hand, the tester 2 transmits the test data measured in the regular test to the protective relay 1, and the protective relay 1 determines the test data and the history data of the storage unit 14 in the determination unit. The deterioration is judged by comparing and the result is tested by the tester 2
I am trying to send it to you.

In this embodiment, for example, the periodic test is performed as shown in FIG. First, the tester 2 sends a test current to the protective relay 1 to start, for example, a timed operating current test. When the protective relay 1 operates and the test is completed, the tester 2 outputs test data, that is, , The measured value is transmitted to the protective relay 1, and the protective relay 1 retrieves the history data of the time-delayed operating current test from the history data which is the test data at the completion test, and the measured value transmitted from the tester For example, it is determined whether or not the rate of change of the measured value is within ± 10% by comparing with the historical data. If it is not within ± 10%, it is determined that there is deterioration and the determination result is sent to the tester 2. If you send it and it is within ± 10%,
It is determined that there is no deterioration, the determination result is transmitted to the tester 2, and the process moves to the next test item.

As described above, the test data at the time of the completion test, which is the previous test data, is stored in the protective relay 1 as history data, and the test data measured in the periodic test is protected from the test device 2. As it is transmitted to the relay 1 and compared with the above-mentioned history data in the protective relay 1 to determine the deterioration, the test data is recorded one by one and brought back to the office like the conventional example, and the test data at the time of completion test Since it is not necessary to make a comparison and make a decision, the decision work of a periodical test can be performed efficiently, and the organization and management of data are easier than in the conventional example.

In FIG. 4, only the comparison judgment of the measured value and the history data is explained, but the measured value is also compared with the standard value as in the conventional case, and the quality is judged.

Further, in the conventional example, as in the present invention, neither the test circuit section 16 nor the test connector 30 for connecting the contact confirmation cable 64 to the protective relay 1 is provided, and the contact confirmation is performed during the test. Insert the cable 64 into the power receiving / transforming board 38 and open the protective relay 1 to output its contact point 4
According to this embodiment, the test can be easily performed only by connecting the contact confirmation cable 64 from the front surface of the protective relay 1 to the test connector 30.

FIG. 5 is a flowchart corresponding to FIG. 4 of another embodiment of the present invention. In the above-described embodiment, the history data, which is the test data at the time of the completion test, is set as the protection relay 1
Although the protection relay 1 determines the deterioration, the history data of each protection relay 1 is stored in the tester 2 and the tester 2 determines the deterioration in this embodiment.

That is, the tester 2 stores the test data at the completion test for the plurality of protective relays 1 to be tested,
The history data is stored in association with the unique serial number of each protective relay 1.

First, the tester 2 is the protective relay 1
When a test current is applied to the protection relay 1 and the protection relay 1 operates and the test is completed, the protection relay 1 requests a unique serial number, and the protection relay 1 responds to the request. Then, the number is transmitted, and the tester 2
The corresponding historical data is retrieved from the historical data that is the test data at the time of the completion test corresponding to the number, the measured value is compared with the historical data, and the change rate of the measured value is, for example, ±
It is determined whether or not it is within 10%. If it is not within ± 10%, it is determined that there is deterioration, and if it is within ± 10%, it is determined that there is no deterioration and the process moves to the next test item. . The other structure is the same as that of the above-mentioned embodiment.

FIG. 6 shows another embodiment of the present invention, which is shown in FIG.
It is a flowchart corresponding to.

In this embodiment, the history data, which is the test data at the time of the completion test, is stored in each protective relay 1 as in the embodiment of FIG. 4, while the deterioration of the protective relay 1 is judged by the operation of FIG. Similar to the example, the tester 2 is used.

First, the tester 2 sends a test current to the protective relay 1 to start, for example, a timed operating current test,
When the protective relay 1 operates and the test is completed, the tester 2
Request to the protective relay 1 the history data of the timed operating current test of the history data which is the test data at the time of the completion test stored in the protective relay 1, and the protective relay 1
Sends the corresponding history data to the tester 2 and the tester 2
Compares the measured value with the history data transmitted from the protective relay 1 to determine whether or not the rate of change of the measured value is within ± 10%. If it is not within ± 10%, there is deterioration. If it is within ± 10%,
It is judged that there is no deterioration and moves to the next test item. The other structure is the same as that of the above-mentioned embodiment.

In each of the above embodiments, the test data at the completion test is stored as history data and compared with this history data. However, as another embodiment of the present invention, it is obtained for each regular test. It is also possible to update and save the test data to be obtained as new history data, and compare the updated history data with the new test data.

FIG. 7 is a flowchart corresponding to FIG. 4 of such an embodiment, and in this embodiment, the protective relay 1
In addition, the test data for each periodical test is updated and stored as new history data, and the protective relay 1 compares the history data with the test data to determine deterioration.

That is, first, the tester 2 sends a test current to the protective relay 1 to start a test such as a timed operation current test. When the protective relay 1 operates and the test is completed, the tester 2 , The test data, that is, the measured value is transmitted to the protective relay 1, and the protective relay 1 compares the historical data sequentially updated and stored for each periodic test with the measured value transmitted from the tester 2, and measures the measured value. It is determined whether or not the rate of change of the value is within a specified range, for example, within ± 10%. If the rate of change is not within ± 10%, it is determined that there is deterioration, the determination result is transmitted to the tester 2, and ± When it is within 10%, it is determined that there is no deterioration, the measured value is updated and stored as new history data, the determination result is transmitted to the tester 2, and the process proceeds to the next test item.

FIG. 8 shows another embodiment of the present invention, which is shown in FIG.
It is a flowchart corresponding to. In this embodiment, the test data for each periodical test is updated and stored in the tester 2 as new history data, and the tester 2 compares the history data with the test data to determine deterioration. is there.

That is, first, the tester 2 sends a test current to the protective relay 1 to start a test such as a timed operating current test. When the protective relay 1 operates and the test is completed, the tester 2 is given a unique characteristic. Requesting the serial number of the test relay, and the protective relay 1 transmits the number in response to the request,
Retrieves the corresponding history data from the history data which is the test data corresponding to the number, compares the measured value with the retrieved history data, and the rate of change of the measured value is within the regulation, for example, ± 10. It is determined whether or not it is within%, and if it is not within ± 10%, it is determined that there is deterioration, and ± 10%.
If it is within the range, it is determined that there is no deterioration, the measured value is updated and stored as new history data, the determination is completed, and the process moves to the next test item.

FIG. 9 shows another embodiment of the present invention, which is shown in FIG.
It is a flowchart corresponding to. In this embodiment, the history data that is sequentially updated for each periodic test is stored in each protection relay 1 as in the embodiment of FIG. 7, while the protection relay 1 is stored.
The deterioration is determined by the tester 2 as in the embodiment of FIG.

That is, first, the tester 2 sends a test current to the protective relay 1 to start a test such as a timed operating current test. When the protective relay 1 operates and the test is completed, the tester 2 , Requesting the corresponding history data among the history data sequentially updated and stored in the protection relay 1, and the protection relay 1 transmits the corresponding history data to the tester 2 and performs the test. The device 2 compares the measured value with the history data transmitted from the protective relay 1 to determine whether the rate of change of the measured value is within the regulation, for example, within ± 10%, and is not within ± 10%. Sometimes, it is determined that there is deterioration, and when it is within ± 10%, it is determined that there is no deterioration and the measured value is transmitted to the protective relay 1, and the protective relay 1 transmits the measured value to new history data. Is updated and stored as the next test item Is shall.

The other constructions of the embodiments of FIGS. 7 to 9 are the same as those of the embodiment of FIG.

[0042]

As described above, according to the present invention, the previous test data is stored as history data in the storage section of the protective relay or the tester, and when new test data is measured, the data and the above-mentioned storage are stored. Since the judgment data of the protective relay or the tester is compared with the historical data of the part to judge the deterioration of the protective relay, the test data is recorded and brought back to the office as in the conventional example. There is no need to make a comparison with the previous test data one by one,
Judgment work can be performed efficiently, and data management and organization becomes easy.

[Brief description of drawings]

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

FIG. 2 is a partial front view of the protective relay of FIG.

FIG. 3 is an explanatory view of a state during the test of the embodiment of FIG.

FIG. 4 is a flowchart for explaining the operation of the embodiment of FIG.

FIG. 5 is a flowchart of another embodiment of the present invention.

FIG. 6 is a flowchart of another embodiment of the present invention.

FIG. 7 is a flowchart of another embodiment of the present invention.

FIG. 8 is a flowchart of another embodiment of the present invention.

FIG. 9 is a flowchart of another embodiment of the present invention.

[Explanation of symbols]

 1 Protective Relay 2 Tester 14 Memory 16 Test Circuit 26 Relay

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshimori Fujieda 918-1 Minamisayama, Nakagami, Ijuma City, Saitama Prefecture Musashi Denki Keiki Seisakusho Co., Ltd. (72) Osamu Fukui, Ijuma City, Saitama Prefecture Minamisayama 918-1 Musashi Electric Instruments Co., Ltd.

Claims (5)

[Claims] 1. A test system for a protective relay, comprising: a protective relay; and a tester which is connected to the protective relay to supply a quantity of electricity for testing and to which an output of the protective relay is given. At least one of the tester has a storage unit that stores the test data measured by the tester as history data and leaves a test history, and at least one of the protective relay and the tester has a previous A test system comprising: a judgment unit for judging deterioration of a protective relay by comparing the history data corresponding to the test with the test data. 2. A protection relay connected to a tester that supplies an electric quantity for testing, wherein test data measured by the tester and given from the tester is stored as history data to test history. A protective relay characterized by having a storage section for leaving. 3. A tester which is connected to a protective relay to supply a quantity of electricity for testing and to which the output of the protective relay is given, in which measured test data is stored as history data and a test history is stored. A tester characterized by having a storage section for leaving. 4. A protective relay connected to a tester that supplies a quantity of electricity for testing, the test data being measured by the tester and given from the tester, and before being measured by the tester. The protective relay having a judging section for judging deterioration of the protective relay by comparing with historical data corresponding to the test. 5. A tester which is connected to a protective relay to supply a quantity of electricity for testing and to which the output of the protective relay is provided, which corresponds to the measured test data and the measured previous test. A tester having a judging section for judging deterioration of a protective relay by comparing with historical data.