JP2009171722A - Digital protective relay device and test method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital protective relay device capable of reducing the cost required for a test instrument by eliminating the necessity of the multifunctional test instrument and easily executing a test, and to provide a test method thereof. <P>SOLUTION: A first test terminal 11 capable of connecting a voltage/current generator for imparting a voltage and a current for test is provided on an input side of an input converter 2, and a second test terminal 12 capable of connecting an information processing device 13 for imparting a digital quantity for executing a test of a relay constituent is provided between an A/D converter 3 and a relay constituent calculating section 4. A voltage and a current for test are given from the first test terminal 11 to confirm the soundness of the input converter, and then, a digital quantity for test is given from the second test terminal 12 to execute a test of the relay constituent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital protection relay device used for power system protection and a method for testing the same.

  Generally, the digital protection relay device includes an input converter that inputs an electric quantity from an electric power system, an A / D converter that converts an analog quantity input to the input converter into a digital quantity, and the digital A relay element operation unit that operates a relay element according to an amount and outputs an operation signal of the relay element; a sequence processing unit that executes a sequence process based on a relay operation signal calculated by the relay element operation unit; and the sequence It has an output processing unit (DO) that outputs the processing result, and converts, for example, the amount of electricity such as current and voltage flowing in the power transmission line into a required level and then converts it into a digital signal, and then executes the calculation. Based on the calculation result, it has a function of determining the presence or absence of an accident by comparing with an operation set value set in advance, and outputting a trip command to the circuit breaker when it is determined to be an accident.

  Conventionally, when testing whether or not this digital protective relay device functions normally, a test voltage / current is applied to the test terminals (CTT, PTT) provided on the input side of the input converter. A voltage / current generator is connected, and various voltages and currents for testing are supplied from the voltage / current generator in the form of analog quantities for testing.

In addition, an automatic test method has been developed to eliminate the trouble of frequently setting conditions for each test condition. For example, in the configuration example shown in Patent Document 1 below, it is necessary to perform an automatic test of a protective relay device on a voltage / current generator that provides a voltage and current for testing the protective relay device. A control unit that provides current and voltage values is provided, and an information processing device is connected to this control unit to input various data necessary for testing, and test data is taken from the control unit and processed to display test results A configuration such as doing so is disclosed.
JP 2000-184574 A

  However, conventionally, in order to confirm the characteristics of the protective relay device, a multi-function tester (for example, an external trip signal input) that can generate a three-phase voltage / current and set various conditions. Parts, rapid change function, millisecond meter, etc.) are required, and a large number of test equipment is brought to the site and the test equipment is connected according to the test contents, and then each test equipment is adjusted. Therefore, the test equipment is expensive, and it takes a lot of time to carry in, install, replace and adjust the test equipment.

  In the configuration in which the automatic test described above is performed, voltage, current input, setting of conditions, and the like suitable for each test condition can be automated. For example, in the configuration disclosed in Patent Document 1, protection is performed. By controlling the control unit that gives the current and voltage values necessary for testing the relay device with the information processing device, the effort to install and replace the test equipment is saved. A multifunctional tester (such as a control unit) that can be used is still necessary.

  The present invention has been made in view of the circumstances as described above, eliminates the need for a multifunctional tester, and reduces the labor involved in tests such as loading, mounting, replacement, and adjustment of the tester. The main object is to provide a digital protective relay device and a test method for the digital protective relay device that can be easily tested.

  In order to achieve the above object, a digital protection relay device according to the present invention includes an input converter that inputs an electric quantity from an electric power system, and an analog quantity that is input from the input converter into a digital quantity. A D / D converter, a relay element operation unit that operates the relay element according to the digital quantity, and outputs an operation signal of the relay element, and executes a sequence process based on the relay operation signal calculated by the relay element operation unit In a configuration having a sequence processing unit and an output processing unit for outputting a result of the sequence processing, a voltage / current generator for supplying a test voltage and current to the input side of the input converter is a first test terminal. An information processing apparatus that provides a digital quantity for testing the relay element between the A / D converter and the relay element calculation unit. It is characterized in that a connectable via a terminal.

  Accordingly, since the first test terminal to which the voltage / current generator can be connected and the second test terminal to which the information processing apparatus can be connected are provided, the voltage / current generator is connected to the first test terminal. After confirming only the soundness of the input converter and confirming the soundness of the input converter, connect the information processing device to the second test terminal to supply a digital quantity for the test. It is possible to perform various tests.

  In other words, the test conducted by connecting the voltage / current generator is only the test to confirm the soundness of the input converter, so that a multi-functional tester is not required, and the relay element test is performed digitally from the information processing device. Since the signal is used, the test can be easily performed by using a general-purpose personal computer or the like.

The test result based on the voltage / current supplied from the voltage / current generator can be taken into the information processing apparatus connected to the first test terminal, and the soundness test data of the input converter is stored in the information processing apparatus. You may make it display on.
Also, the relay element test results are taken into the information processing apparatus via a separate output terminal to which the information processing apparatus is connected or via the first test terminal, and the relay element test data is stored in the information processing apparatus. Display may be possible.

  Therefore, the digital protection relay device testing method according to the present invention includes an input converter for inputting an electric quantity from an electric power system, and an A / D conversion for converting an analog quantity input by the input converter into a digital quantity. A relay element that operates a relay element according to the digital quantity and outputs an operation signal of the relay element, and a sequence process that executes a sequence process based on the relay operation signal calculated by the relay element calculation unit And an output processing unit for outputting the result of the sequence processing, a test method for a digital protection relay device, comprising a voltage / current generator connected to the input side of the input converter A first test step for confirming the soundness of the input converter by applying an electric current, and an information processing device connected between the A / D converter and the relay element calculation unit And and a second test step for testing of the relay elements by providing a digital amount of use.

  At this time, the soundness of the input converter may be confirmed by an information processing device connected between the A / D converter and the relay element calculation unit. Further, the relay element test result may be displayed on the information processing apparatus connected between the A / D converter and the relay element calculation unit by fetching the relay element test result information. .

    As described above, according to the present invention, only the test for confirming the soundness of the input converter is performed based on the analog amount from the voltage / current generator connected to the input side of the input converter, and the relay element test is performed. Is performed by the digital quantity from the information processing device connected between the A / D converter and the relay element calculation unit, so that a multi-functional tester is not required and the test of the relay element is simplified. Can be done.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best embodiment of the invention will be described with reference to the accompanying drawings.

In FIG. 1, the block diagram of the digital protection relay apparatus 1 which concerns on embodiment of this invention is shown.
In this protective relay device 1, the voltage, which is the amount of electricity in the power system, is detected by an instrument transformer (PT) (not shown), and the current is detected by an instrument current transformer (CT) (not shown) as an analog quantity. It is captured and input to the input converter 2. The input analog quantity is converted into an electric signal that can be handled by the digital type protective relay device in the input converter 2, and the converted electric signal is input to the A / D converter 3 and converted into a digital quantity. Is done.

  The input electric quantity converted into a digital quantity by the A / D converter 3 is read into the relay element calculation unit 4 where a relay calculation process is performed. That is, a relay calculation process for operating the relay element based on the read digital quantity is performed, and when the digital quantity deviates from a predetermined settling value, it is determined that an accident has occurred in the power system, and the relay operation signal Is output to the sequence processing unit 5.

  In the sequence processing unit 5, the sequence processing is executed based on the relay operation signal. Information from the field equipment necessary for this sequence processing (breaker, pallet signal of disconnector, etc.) is input from the input processing unit (DI) 6, and the sequence processing unit 5 is used as a circuit breaker in the protection section of the power system. On the other hand, a trip signal is output via an output processing unit (DO) 7.

  Therefore, when an accident occurs in the electrical system, a relay operation signal is output by the relay calculation process of the relay element calculation unit 4, the sequence process is performed by the sequence processing unit 5, and power is output from the output processing unit (DO) 7. A trip signal is output to the circuit breaker in the fault section of the system to excite the circuit breaker coil and open the main contact to protect the power system. In addition, the operation information of the protective relay device 1 such as the operation information of the relay can be taken out from the output processing unit (DO) 8 through the output terminal 9.

  In such a digital protective relay device 1, in order to test whether or not the protective relay device 1 functions normally, a test voltage or current as an analog amount is applied to the input side of the input converter 2. A digital quantity for testing a relay element between a first test terminal (PTT, CTT) 11 to which a voltage / current generator 10 to be applied can be connected, and the A / D converter 3 and the relay element calculation unit 4 And a second test terminal 12 to which a general-purpose information processing device 13 such as a personal computer that can provide the information can be connected.

Next, a test method for the digital protection relay device 1 in the above configuration will be described.
First, as shown in FIG. 2, a voltage / current generator 10 as a tester is connected to the first test terminal 11 and an information processing device 13 is connected to the second test terminal 12 to perform input conversion. Test the integrity of vessel 2. In this test, a voltage / current for testing is input from the voltage / current generator 10 to the protective relay device 1, and the result is captured and displayed on the information processing device 13 connected to the second test terminal 12. This is done by determining whether or not a predetermined digital value is obtained for the input quantity of electricity.

  Therefore, as long as the soundness of the input converter 2 can be confirmed, a multifunctional voltage / current generator is not required as a tester, and a simple tester (voltage / current generator) 10 can be used. The cost required for the vessel can be reduced.

  Next, after the soundness of the input converter 2 is confirmed, as shown in FIG. 3, a digital waveform for testing the relay element with the information processing device 13 connected to the second test terminal 12 Data is directly input from the information processing device 13 to the relay element calculation unit 4 to test the relay element. The test result is taken into the information processing device 13 from the output processing unit (DO) 8 that outputs the operation information of the relay element and the like through the output terminal 9 and displayed on the monitor of the information processing device 13.

  Therefore, since the relay element test is performed by inputting waveform data that is a digital signal from the information processing device 13, digital waveform data to be input by a predetermined program can be automatically generated, and the relay element test is performed. Can be performed easily.

  In the above-described configuration, the operation information of the relay element and the like is taken into the information processing device 13 via the output terminal 9, but the output processing unit (DO) 8 is set in the second test in the protective relay device. By connecting to the terminal 12 and enabling bidirectional data transmission / reception via the second test terminal 12, output data from the output processing unit (DO) 8 can be transmitted via the second test terminal 12. You may make it take in in the information processing apparatus 13. FIG.

FIG. 1 is a block diagram showing the overall configuration of a digital protection relay device according to the present invention. FIG. 2 is a block diagram illustrating a method for confirming the soundness of the input converter using the digital protection relay device of FIG. FIG. 3 is a block diagram illustrating a technique for testing relay elements using the digital protective relay device of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital protective relay apparatus 2 Input converter 3 A / D converter 4 Relay element operation part 5 Sequence processing part 7, 8 Output processing part 10 Voltage / current generator 11 1st test terminal 12 2nd test terminal 13 Information processing device

Claims (6)

An input converter for inputting an electric quantity from an electric power system, an A / D converter for converting an analog quantity inputted by the input converter into a digital quantity, and operating a relay element by the digital quantity, the relay element A relay element calculation unit that outputs the operation signal of the above, a sequence processing unit that executes sequence processing based on the relay operation signal calculated by the relay element calculation unit, and an output processing unit that outputs the result of the sequence processing In digital protection relay device,
A voltage / current generator for applying a test voltage and current to the input side of the input converter can be connected via the first test terminal,
An information processing device for providing a digital quantity for testing the relay element can be connected between the A / D converter and the relay element calculation unit via a second test terminal. Digital protective relay device. 2. The digital protection relay according to claim 1, wherein the test result based on the voltage / current supplied from the voltage / current generator can be taken into the information processing apparatus connected to the second test terminal. Electrical equipment. 2. The test result of the relay element can be taken into the information processing apparatus via an output terminal connectable to the information processing apparatus or via the second test terminal. The digital protective relay device described. An input converter for inputting an electric quantity from an electric power system, an A / D converter for converting an analog quantity inputted by the input converter into a digital quantity, and operating a relay element by the digital quantity, the relay element A relay element calculation unit that outputs an operation signal of the above, a sequence processing unit that executes sequence processing based on the relay operation signal calculated by the relay element calculation unit, and an output processing unit that outputs a result of the sequence processing In the test method of the digital protective relay device having,
A first test step of confirming the soundness of the input converter by connecting a voltage / current generator to the input side of the input converter and applying a test voltage and current;
A second test step of testing the relay element by connecting an information processing device between the A / D converter and the relay element computing unit to give a digital quantity for testing. A test method for a digital protective relay device, which is characterized. 5. The digital protection relay according to claim 4, wherein the soundness of the input converter is confirmed by the information processing apparatus connected between the A / D converter and the relay element calculation unit. Testing method for electrical equipment. 5. The test result of the relay element is captured and displayed on the information processing apparatus connected between the A / D converter and the relay element calculation unit. Test method for digital protective relay device.

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