JP3692179B2 - Protection relay test equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a test apparatus for testing a power protective relay .
[0002]
[Prior art]
Protective relays used in the power system are those that operate in single-phase or multi-phase, those that operate in voltage, current, or frequency, or that operate in terms of harmonic content, phase difference between voltage and current, etc. Many types exist, such as those that operate in combination. Since the operation time of these protective relays is restricted by the mechanical structure, the time to reach the equilibrium state (stable state) differs depending on the structure and type of the protective relay. For this reason, there are problems such as the time to reach the equilibrium state after setting the steady state and the time to reach the equilibrium state after setting the failure state, and the operation and recovery time must be measured. The development of a test device that can efficiently measure the operation time and recovery time of the protective relay was desired.
[0003]
FIG. 3 is an explanatory diagram of a conventional method for measuring the operation / return time of a protective relay. In the figure, reference numeral 1 denotes a protection relay to be tested, which is a protection relay having one voltage input voltage winding and one current input current winding. This test apparatus is provided with a steady state oscillator 2 and a failure state oscillator 3, which are switched to set two states of electricity, a steady state and a failure state, and send them to the protection relay 1 to be tested. Yes. The output of the steady state oscillator 2 is subjected to the test conditions in the steady state via the contacts (ab) and (de) of the changeover switch, and the output of the failure state oscillator 3 is the contact (ac) (d) of the changeover switch. test conditions for determining that a fault condition via -f) is sent to an output amplifier 4 and 5, further, these outputs are turned so that is sent to the voltage winding and current windings of the test protective relay 1 Yes. The CPU 6 controls each part of the test apparatus based on a test program, and further includes a response time measurement timer 6a and an operation panel 7 and a display 8 and the like. The response time measuring timer 6a is a timer that measures the time from when a required condition is given to the protection relay under test 1 until the contact operates or returns .
[0004]
In the test apparatus having such a configuration, the changeover operation of the changeover switch has conventionally been performed manually via the operation panel 7. For example, in order to measure the operation time when the protective relay 1 in the steady state shifts to the failure state, the operator first sets the test apparatus to the steady state and then manually switches to the failure state, and the response at this time The measurement value of the time measurement timer 6a was read. In addition, in order to measure the recovery time when the protective relay 1 in a faulty state returns to a steady state, the operator sets a test device in the faulty state and then has enough time for the protective relay 1 to reach an equilibrium state. Then, it was manually switched to the steady state, and the recovery time at this time was read with the measured value of the response time measuring timer 6a. Therefore, it takes a lot of time and labor to test one protective relay, and it is difficult to increase the test efficiency.
[0005]
[Problems to be solved by the invention]
It is an object of the present invention to provide a protective relay test apparatus capable of both operation and recovery tests in a single test process.
[0006]
[Means for Solving the Problems]
The protection relay test apparatus according to the present invention includes an oscillator that generates a steady state condition and an oscillator that generates a failure state condition, and can arbitrarily set at least one of a steady state condition and a failure state condition to be applied to the protective relay under test. Test condition generation means, response measurement means for measuring the time until the protection relay under test responds and operates when a fault condition is applied to the protection relay under test, and a predetermined value from the time of operation of the protection relay under test. In response to the test standby means capable of varying the standby time for standby while the failure state condition is applied for a period of time, and applying the steady state condition to the protective relay under test after the test standby time has elapsed. wherein a returning measuring unit under test protective relay measures the time to return, the test stand device under test protection relay by changing the failure wait time by means Extent short transient fault conditions is obtained by allowing also for it can response tests. Further, it is possible to provide a measured value display means for displaying the operation time measured by the response measuring means and the return time measured by the return measurement means side by side.
[0007]
By configuring in this way, it is possible to inspect the operation and return of the protective relay in a single inspection process, and also to change the standby time for failure and how short the protective relay under test is in a transient fault state Can be tested up to. In addition, it is possible to easily determine whether the operation is good or not by displaying both the measurement time of the operation and the recovery time side by side .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a protection relay test apparatus according to this embodiment. In FIG. 1, reference numeral 1 denotes a protection relay to be tested. In this embodiment, the protection relay to be tested 1 includes one voltage winding for inputting voltage and one current winding for inputting current. Alternatively, a protective relay that operates with a phase difference between voltage and current will be described as an example. The protective relay 1 to be tested has a contact point of “open” when the input voltage, current, phase, etc. are determined to be steady, and conversely, when these values are determined to be faulty, When it is determined as “closed”, it is regarded as a normal operation.
[0009]
This protection relay test apparatus is provided with a steady state oscillator 2 and a fault state oscillator 3, and these oscillators 2 and 3 have two states of electricity (voltage, current, frequency, phase angle, etc.) in a steady state and a fault state. ) And can be sent to the protective relay 1 under test. The output of the steady state oscillator 2 is subjected to test conditions such as steady state voltage, current, and phase via the contacts (ab) and (de) of the changeover switch, and the output of the failure state oscillator 3 is the output of the changeover switch. Test conditions such as voltage, current, and phase for determining a failure state are sent to the voltage output amplifier 4 or the current output amplifier 5 through the contacts (ac) and (df). It is sent to the voltage winding and current windings of the test protective relay 1 has become so that. The operation of this changeover switch is instructed by the CPU 6 described later.
[0010]
CPU6 is is to control on the basis of each unit of the test apparatus to test the program, each part testing conditions are set by an instruction from the operation panel 7 I Sakiritsu the test operation. The test result is sent to the display 8 that displays the operation time and return time of the protective relay 1 under test. The CPU 6 has a response time measuring timer 6a and a failure standby time timer 6b, and monitors the operation or return status of the protection relay under test 1 sent via the contact output of the protection relay under test 1 by these. The response time measuring timer 6a is a timer for measuring the time from when a required condition is given to the protection relay under test 1 until the contact operates or returns . The failure standby time timer 6b is a timer that starts a timer operation from the time when the protection relay under test 1 operates, stops when a predetermined time has elapsed, and the test conditions of the test apparatus are maintained during that time. . The failure standby time is set by the operation panel 7 according to the type of the protective relay 1 to be tested. In setting the failure standby time, it is necessary to set a time that is slightly longer than the time during which the protection relay under test 1 can respond to the next test condition.
[0011]
The test operation of the protective relay test apparatus having such a configuration will be described with reference to the time chart shown in FIG. First, the test conditions such as voltage, current, and phase are input to the steady state oscillator 2 and the failure state oscillator 3 and the required time data is input to the failure standby time timer 6 b via the operation panel 7. First, since the contact (ab) (de) of the changeover switch is closed as an initial condition, the steady state which is the output of the steady state oscillator 2 is selected and applied to the protection relay 1 to be tested. . Under this condition, the protective relay 1 under test is in the “open” state.
[0012]
When a measurement start command is sent in this state, the CPU 6 switches the contact of the changeover switch to the (ac) (df) side, and applies the output of the failure state oscillator 3 to the protection relay 1 to be tested. At the same time, the time measurement by the response time measurement timer 6a is started. (State A in FIG. 2) If the protective relay 1 under test is “closed” with the output of the fault state oscillator 3 applied, the measurement of the response time measuring timer 6a is stopped and the measured value is displayed on the display 8 And displayed as the operation time when the protection relay under test 1 is faulty.
[0013]
Further, the test apparatus starts the measurement of the standby time from the time when the contact output of the protective relay 1 to be tested is “closed”, and measures the time when the predetermined time preset by the operation panel 7 is reached. The operation is stopped (state B in FIG. 2). During this failure waiting time, the test apparatus maintains the test operation conditions, and during this waiting time, the transient phenomenon generated in the windings and the like due to the protection relay 1 to be tested being “closed” is settled, The following steady state tests can be performed normally.
[0014]
When the failure standby time is over, the CPU 6 switches the contact of the changeover switch to the (ab) (de) side, applies the output of the steady state oscillator 2 to the protective relay 1 to be tested, and enters the steady state measurement. The response time measurement timer 6a starts measuring the time from the time when the steady state is applied (state C in FIG. 2). If the protection relay under test 1 is in a steady state and is normal, the contact of the protection relay under test 1 is “open” after a predetermined time. Since the contact is “open”, the response time measuring timer 6a ends the measurement, and the CPU 6 transfers the display time of the measurement result to the display unit 8 and displays it. The display unit 8 displays both the operation time and the return time side by side in the vertical direction (or the horizontal direction), thereby facilitating comparison and examination of both measurement times. Thus, a series of test operations for the protection relay under test 1 is completed.
[0015]
According to this embodiment, the failure standby time timer 6b is provided, and the measurement operation condition is continuously maintained until the protection relay under test 1 reaches the equilibrium state in response to the failure state so as to prevent the occurrence of the measurement error. As a result, the operation time and recovery time can be measured automatically and continuously. In addition, since the display of the operation time and the return time of the protection relay 1 to be tested is displayed independently, the two can be compared and examined at a glance. In this embodiment, the operation time and the return time are displayed independently. However, one display can be switched and used at the expense of some convenience.
In addition, this invention is not limited to the said embodiment, It can deform | transform and implement in the range which does not change a summary.
[0016]
【The invention's effect】
According to the present invention, the failure waiting time timer is provided, and the time required to reach the equilibrium state when the protection relay is changed to the failure state is absorbed, and the measurement error due to the transient state is eliminated, so that the protection relay Operation and recovery time can be measured continuously in the same test process, and the test time can be shortened and the operation can be simplified.
[0017]
Furthermore, if the failure standby time is changed, it is possible to perform a test such as how short a transient failure state the protection relay under test can respond to.
In addition, since the display of the operation time and return time of the protective relay is provided independently, the test results of both can be confirmed at a glance.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram showing an embodiment of a protection relay test apparatus according to the present invention;
FIG. 2 is a time chart for explaining the operation of the embodiment.
FIG. 3 is a block circuit diagram illustrating a conventional test method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Protection relay under test, 2 ... Steady state oscillator, 3 ... Fault state oscillator,
4 ... Voltage output amplifier, 5 ... Current output amplifier,
6 ... CPU, 6a ... response time measuring timer, 6b ... failure standby time timer,
7: Operation panel, 8 ... Display.

Claims (2)

A test condition generating means that includes an oscillator that generates a steady state condition and an oscillator that generates a fault state condition, and can arbitrarily set at least one of a steady state condition and a fault state condition to be applied to the protection relay under test;
A response measuring means for measuring a time until the protection relay under test responds and operates when a fault condition is applied to the protection relay under test; and
A test standby means capable of varying a standby time for standby in a state in which the failure state condition is applied for a predetermined time from the operation time point of the protected relay to be tested;
Applying a steady state condition to the protective relay under test after the test standby time has elapsed, and comprising a return measuring means for measuring the time for the protective relay under test to return in response thereto,
A test apparatus for a protective relay, characterized in that it is possible to test to what extent the faulty protective relay can respond by changing the fault standby time by the test standby means .   2. The protective relay test apparatus according to claim 1, further comprising measurement value display means for displaying the operation time measured by the response measurement means and the return time measured by the return measurement means side by side.

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