JPH07322471A - Automatic tester of protective relay - Google Patents

Abstract

PURPOSE:To enable test work to be efficiently performed without depending upon human being by performing making a protective relay being the object of test store the kind of it's own relay in advance, and selecting the test pro gram by means of an automatic tester from among the storage, and setting the test conditions and performing the test. CONSTITUTION:A protective relay being object of test stores the kind of it's own relay The automatic test start switch 2 of an automatic tester 2 is pushed, and the kind of a relay being the object of test is inputted, and a test program selecting circuit 2-1-A selects an applicable test program from among the storage of the protective relay being the object of test. A test condition setting circuit 2-1-B decides the test condition, according to this test program, and give the current and voltage set in the protective relay being the object of test, to a current and voltage setting circuit 2-4, and a test result judging circuit 2-1-C judges the test result by the operation result of the relay. Hereby, the test work can be executed efficiently, without depending upon human being.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test device for a protective relay of a power system, and more particularly to an automatic test device which does not require setting of test conditions by a human system.

[0002]

2. Description of the Related Art A protective relay responds only when an accident occurs in the power system, and is always in a standby state while monitoring the power system. In general, system accidents (particularly in-section accidents) are not frequently obtained, so an automatic inspection function is provided as a means for confirming the soundness of protective relays, and automatic inspection of equipment is performed at regular intervals. It is being carried out.

In the automatic inspection of the digital protection relay, the main purpose is to confirm the operation of the circuit that does not normally operate, the confirmation of the operation / return of the final-stage relay, and the application of a certain amount of inspection input to the analog input circuit. Checking the analog input level to be introduced. However, from the aspect of guaranteeing the characteristics of the relay, in the automatic inspection of the analog input circuit, there are some parts that cannot be said to be sufficient in the following items.

(1) Insufficient confirmation of the level that guarantees the accuracy of the protection relay. (2) Even if item (1) is sufficient, confirmation by data is insufficient. For this reason, in the conventional protective relay, at the time of periodic inspections carried out in units of one year or several years, in order to reconfirm the characteristics of the relay, apply current / voltage from the test terminal and
It is customary to carry out relay characteristic tests such as return value, phase characteristics, and ratio characteristics.

[0005]

In the relay characteristic test in the periodic inspection, the current / voltage input is adjusted and applied by the human system by using the TPR tester or the like, and the quality judgment is also performed by the human system. Therefore, it is a labor-intensive and time-consuming task. In addition, there is also an inherent problem that there is always a possibility that an adjustment error or a human error will occur in the human system. The contents are the same not only in the periodic test but also in the relay characteristic test at the time of completion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic test apparatus which can be expected to reduce the number of workers / working hours in a regular test and a completion test and improve the test accuracy.

[0007]

In order to achieve the above object, it goes without saying that an automatic test apparatus, which will be described later, is required, but the protective relay to be tested also has an interface function with the test apparatus. However, it is required that the information required for the test be passed.

The automatic test apparatus comprises an automatic test start switch, a transmission interface circuit with a protection relay to be tested and an oscilloscope interface circuit, a test control circuit, and a test voltage / current level setting circuit. Among them, the test control circuit is a central part of the present invention, and includes a test program selection circuit, a test condition setting circuit, a test result determination circuit, and a test result display output circuit. The test control circuit integrally controls the automatic test processing of the relay so that the relay functions smoothly.

[0009]

Function: The protection relay to be tested stores its own relay type, the automatic test device inputs the relay type from the test target, and selects the corresponding test program from the ones stored in advance. Then, according to this test program, the test condition is determined, the set current / voltage is given to the protection relay to be tested, and the test result is judged by the operation result of the relay.

[0010]

1 and 2 are functional block diagrams of a protective relay to be tested and an automatic test apparatus showing a configuration of the present invention. In FIG. 1, reference numeral 1 indicates a protection relay to be tested.

Reference numeral 1-1 represents a relay element information storage circuit.
The type (type, etc.) of the relay, the set value of the relay, etc. are stored here. 1-2 indicates an interface circuit. Data is exchanged with the automatic test apparatus of the present invention by this circuit. The data transmission method is not particularly limited as long as the required transmission amount is satisfied for both optical signals and electric signals. 1-3 is an A / D conversion circuit for converting the current / voltage information input to the relay into a digital quantity, 1-
Reference numeral 4 represents a relay element operation circuit, 1-5 represents a relay operation output selection circuit for outputting a relay operation result in accordance with an external instruction condition, and 1-6 represents a relay operation oscilloscope output interface circuit.

In FIG. 2, reference numeral 2 indicates a protective relay automatic test apparatus according to the present invention. Reference numeral 2-1 shows a test control circuit having a central function of the automatic test apparatus. 2-1 is a test program selection circuit 2-1 -A that selects the test content according to the relay element information, a test condition setting circuit 2-1 -B that determines the test condition according to the selected test program, and an automatically set test. Test result judgment circuit 2-1 -C for judging the quality of the test result from the condition and relay operation information transmitted from the protection relay under test, and test result display output circuit 2-1 -D for outputting the test result externally It is composed of 2-2 shows an interface circuit. This circuit transfers data to and from the protective relay under test. 2-3 shows an oscilloscope input interface circuit for inputting the oscilloscope signal of the relay. Reference numeral 2-4 shows a level setting circuit for setting the levels of current and voltage applied to the protection relay to be tested according to the test condition setting result. Two
-5 is an automatic test start switch.

The reaction during the automatic test of the relay having such a configuration will be described in time series. (Test preparation) (1) Interface circuit 1-2 of protection relay 1 to be tested and interface circuit 2-2 of automatic test apparatus 2
Connect.

(2) The oscilloscope output interface circuit 1-6 of the protection relay 1 to be tested and the oscilloscope input interface circuit 2-3 of the automatic test apparatus 2 are connected. (3) The output of the current / voltage level setting circuit 2-4 of the automatic tester is connected to the current / voltage A / D conversion circuit 1-3 of the protection relay to be tested.

(Test start) (4) The automatic test start switch 2-5 is pressed to start the automatic test. (5) The test program selection circuit 2-1 -A receives information from the relay element information storage circuit 1-1 input via the interface circuits 2-2 and 1-2, and prepares a test program prepared in advance. Select the test program to be executed this time.

(6) In the test condition setting circuit 2-1 -B, the relay operation output selecting circuit 1 -via the interface circuits 2-2 and 1-2 according to the test condition automatically set according to the test program selection result. A relay operation output selection command required on the automatic tester side is given to 5 and a current / voltage level setting command required as a current test condition is given to the current / voltage level setting circuit 2-4.

(7) The current / voltage level setting circuit 2-4 sets and outputs the current / voltage level to be given to the protection relay under test according to the test condition setting command. (8) In the protection relay to be tested, the current / voltage input from the automatic test equipment is introduced by the A / D conversion circuit 1-3,
The relay element operation circuit 1-4 determines the operation, introduces the determination result into the relay operation output selection circuit 1-5, and prepares the operation output information to the automatic test equipment.

(9) In the automatic test apparatus, the test result judging circuit 2-1 -C receives the test condition setting result and the test result introduced through the oscilloscope output interface circuit 1-6 and the oscilloscope input interface circuit 2-3. The oscilloscope operation signal of the test target protection relay is collated, and a command is output to the test condition setting circuit 2-1 -B so as to finely adjust the test condition according to the result.

(10) By repeatedly executing the processes from the above items (4) to (9), test results such as the operation value / return value of the relay which has converged are obtained, and finally it is determined whether the test result is good or bad. To judge.

(11) The test result display / output circuit 2-1 -D outputs the test result to the outside. Although there are various output modes, the output mode is not limited, and a method of printing with a printer, a method of displaying a lamp on the display panel, and the like can be considered.

The operation of the above configuration will be described. When conducting the characteristic test of the protection relay to be tested, the pre-programmed test contents are configured to be executed by the automatic test device by pressing the test start switch, so the test work that was conventionally performed by humans can be performed. It becomes possible to carry out efficiently.

[0022]

As described above, it takes a lot of labor and time to carry out the relay characteristic test at the time of the regular test and the completion test, and the adjustment error and the human error in the human system are generated. However, according to the present invention, the test accuracy is further improved by a little labor and time, without depending on the human system, due to the fact that the possibility of occurrence of can not be ignored. It is possible to provide an automatic test device for a protective relay that can be expected to obtain test results.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing the configuration of a protective relay to be tested according to the present invention.

FIG. 2 is a functional block diagram showing the configuration of the automatic test apparatus of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Protected relay under test, 1-1 ... Relay element information storage circuit, 1-2 ... Interface circuit, 1-6 ... Oscilloscope output interface circuit, 2 ... Automatic test device, 2-
DESCRIPTION OF SYMBOLS 1 ... Test control circuit, 2-1 -A ... Test program selection circuit, 2-1 -B ... Test condition setting circuit, 2-1-C ... Test result judgment circuit, 2-1-D ... Test result display output circuit Two
-2 ... interface circuit, 2-3 ... oscilloscope input interface circuit, 2-4 ... current / voltage level setting circuit.

Claims (1)

[Claims] 1. A communication means for inputting element information indicating a relay type of a protection relay to be tested, and a corresponding test program selected from information stored in advance by the communication means to select a test condition. Means to automatically set, communication means to output the automatically set test conditions to the test target protection relay, input means to input operation information of the test target relay, and test target protection from the automatically set test conditions A means for automatically setting the level of the test current / voltage applied to the relay, and means for judging the test result based on the automatic setting result of the test condition and the operation information of the protection relay under test, Automatic test equipment.