JPS62110428A - Input control of testing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an input control method for a test device, and particularly to an input control method for a test device used in automatic testing of protective relays.

[Technical background of the invention]

Inputs for protective relays include voltage, current, frequency, etc.

In order to test the protective relay, the voltage mentioned above,
A current or the like is applied to a protective relay, and this is manually varied to measure the operating value and return value of the protective relay. When attempting to automatically test a protective relay, it is necessary to be able to automatically increase or decrease the voltage, current, frequency, etc. mentioned above at a desired speed without human intervention. Then, while monitoring the entire output of the protective relay, the voltage, current frequency, etc. are automatically increased or decreased, and the operating value or return value of the protective relay is measured. The time required for this operation is the measurement time, and from the perspective of a protective relay testing device, ideally this measurement time is short and measurement accuracy is obtained.

Here, in order to shorten the measurement time, it is necessary to: ■ delay the response of the protective relay by the amount of time it takes to operate or recover; ■
To determine that the protective relay output is activated or restored,
It is necessary to consider the following two items, including the fact that a judgment cannot be made unless the output of the protective relay is monitored for a certain period of time, together with the input variable time.

FIG. 3 is a block diagram illustrating an example of an automatic protective relay test device using an undervoltage relay as an example. The outline of this device will be explained below.

The arithmetic and control device 1 is, for example, a computer, and the arithmetic and control device IK determines test conditions for the relay to be tested in advance, etc.
The control program for automatic testing equipment is stored.

Note that the test condition information includes setting values such as frequency and voltage. In addition, in order to test one protective relay, several dozen steps of operation tests are usually performed.The following explanation is an explanation of the input control method for one step of a test item that includes several tens of steps and chips.

In order to extract the frequency, voltage, etc. of the applicable conditions from the voltage amplifier 6, the arithmetic and control device 1 sets the frequency, voltage, etc. of the conditions stored in advance and inputs them to the input/output device 2.

These set frequency and voltage signals are converted into digital quantities at a desired level by the input/output device 2, and the frequency converted to the digital quantity is sent to the frequency control section 3, and the voltage converted to the digital quantity is sent to the frequency control section 3. Input to D/A 4 respectively.

The frequency control section 3 converts the frequency input converted into a digital quantity into a frequency signal, and the D/A 4 converts the voltage input converted into a digital quantity into a digital analog quantity corresponding to this quantity. The alternating current having the frequency set by each of these converted signals in the calculation control section 1 is output to the signal output control section 5.
It can be obtained with This value converted to alternating current is further amplified by a voltage amplifier 6.

It is taken out as an output as a test device for the protection relay and applied as an input to the protection relay 7.

Further, the output of the undervoltage relay is monitored by a relay output determination section 8 to determine whether it has been activated or restored, and provides an output signal to the input/output device 2 indicating that it has been activated or restored. In FIG. 3, the input to the undervoltage relay is controlled by the voltage setting of the arithmetic and control unit 1 and the presence or absence of an output signal of the undervoltage relay entering the input/output device 2.

FIG. 4 shows a conventional method for measuring the operating value of an undervoltage relay using the test apparatus shown in FIG.

When testing undervoltage relays and devices, the initial setting value may be higher than 1 or lower;
The figure will be explained by taking as an example a case where the actual operating value of the undervoltage relay is lower than the initial setting value. In the figure, the horizontal axis is time,
The vertical axis is the voltage, and the operating range of the undervoltage relay is the shaded area.
This limit is defined as the operating limit value.

-Here, the starting position (initial setting value) of input control is set to A, and the main positions of input control are set to B and C below.

Let them be D, g, and F. F is the operating limit value. Also, the voltage value at each position is % el l 61z ・es
Kei e4*esses. A-+B, B-+CIC
→D, D→E, E-+F range voltage variable speed dM/dt
respectively dτ, /at, aga/dt, aτ3/d
t # dW4/dt'.

Let it be dga/dt. Generally, in order to shorten the time required for input control, avl/dt > dad/dt >
av3At > dv4/dt) dv5/dt. The value is generally determined to be optimal based on experimental results. The voltage e1 at point A at the start position is not the rated voltage of the undervoltage relay, but the nominal setting voltage of the protective relay. The range of control can be narrowed,
This is because the measurement time becomes shorter.

First, at point A, the voltage setting of the calculation control unit 1 is controlled low until the undervoltage relay (hereinafter referred to as Ry) operates.
The voltage is dropped at a rate of 171'/dt. Here R
At the time when R7 is determined to have operated, the output of the arithmetic and control unit 1 is lower than the operation limit value for the aforementioned R7 operation time and the monitoring time required to determine that it is activated. Its value is (ea-ex). Next, the aforementioned dga/d
If Ry returns at a speed of t, the voltage is increased. Similar K
By the time it is determined that R7 has returned, the output has been increased by (es-es). When such input control is repeated and the operation of R7 is determined at the speed of d v 5 At, the e6 voltage is determined to be the operating limit value of this R7.

Next, when the operating value of R7 is higher than the initial setting value,
In this case, the voltage is increased from point A in the direction of recovery, and after R7 is recovered, the control is the same as that described above.

[Problems with background technology]

According to the conventional input control method described above, five
Since the control is performed using various variable speeds, depending on the initial setting value of R7 manual power, there is a problem that unless the speed is further changed, the variable step becomes coarser, making it difficult to obtain sufficient measurement accuracy. .

For example, assuming that dv1/dt in the A − + f3 range is 1 duck, and R7 operates at 100V, I
At a speed of V/see, it becomes a variable speed of l(-, but considering the case of Ry operating at IOV at this variable speed,
Similarly, it becomes coarse at 1047 seconds.

As described above, in the case of the conventional input control method, there is a problem in that the variable speed must be changed depending on the initial setting value of R7 manual power.

As a means to solve this problem, variable speed unit eV/s
%/51 for Ry large input initial setting value, not ee
There is also a method of controlling the output of the arithmetic and control unit 1 to achieve a variable speed of 1c, but there is a problem that the control becomes complicated.
/mm It is necessary to calculate the voltage value of m and change the voltage setting of the arithmetic and control device 1 so as to obtain a predetermined variable speed.

Next, the conventional input control method will be explained from the viewpoint of measurement time with reference to FIG.

In FIG. 5h, the horizontal axis, vertical axis, relay setting values, operating limit values, and A, B, . . . F are the same as in FIG. 4. The 10 hours is the sum of the operation time (or return time) of R7 mentioned above and the monitoring time required to determine that it has operated (or returned).

The t1 time is the time required to vary dv1/at to the operating limit as explained in FIG. T again! time is dl
This is the time required to vary the voltage at the speed of dvBldt from the voltage value that has gone too far by time to to the return limit value by varying the voltage at the speed of dvBldt. Similarly, t3,
t4 # tH time is also dyeAt, dvBl respectively
This is the time required to vary the voltage from an excessive voltage value to the operating or recovery limit value at a speed of dt &d74At.

Therefore, the measurement time in FIG. 5 can be expressed as (4to +t1+, snow+...+ts) time. Here, the 4to time is a value that cannot be eliminated due to the nature of the protective relay, but tl * tl m...ts is the cause of slowing down the measurement time, and it is desirable to make it very short or eliminate it. It will be done. Therefore, in the input control method, in order to shorten the tlHtl *...ts waiting time, ave/at # d172/'dt *...
There is a problem in that each variable speed must be determined to the optimum value.

Furthermore, in order to improve the measurement accuracy, it is necessary to reduce the variable speed so that it does not go too far beyond the operating limit, but if this is reduced, the measurement time becomes longer.

In contrast to the above-described complex input control, a control that is simple and provides measurement accuracy is desired.

[Purpose of the invention]

The present invention has been made to solve the above problems, and provides an input control method for a test device that can obtain sufficient measurement speed and measurement accuracy with simple control when automatically testing static characteristics in a test device such as a protective relay. is intended to provide.

[Summary of the invention]

In the present invention, an initial input is applied to the device under test, and after a certain period of time, it is confirmed whether the output signal of the device is operating or not, and the initial value is 1 /2, 1/4, 1/8, 1/16...
・By sequentially adding or subtracting the value corresponding to the output signal, the input value is changed and the operating limit value of the equipment under test is detected.

[Embodiments of the invention]

Examples will be described below with reference to the drawings. FIG. 1 is a control characteristic diagram of an embodiment for explaining the input control method of the trial testing device according to the present invention.

In FIG. 1, the horizontal axis is time, the vertical axis is voltage, and the operating range of Ry is the shaded area, and its limit is the operating limit value. In addition, the input control start position will be referred to as point 'rA, and hereinafter, the main points of input control will be referred to as 1 kB, C, D, . . . Q, R.

A-+B, C→D, E-+F shown in the figure.

G-+H, I→J, Ni-+L, MAN, 0→P,
Each position from Q to R is a position where the voltage is changed by the arithmetic and control unit IK. The voltages changed at each position described above are the same as those shown in FIG. 4, but in this example, the set value of my (
1/2, 1/4 of the voltage e□ (nominal value).

The value is 1/8...11512. Note that the position of R is the operating limit value of the undervoltage relay. Also shown are the flat parts, namely B-+C, DIE, p'-
*Q.

H→I, J-+K, L-')M, N→Q,
The time between p-+Q is a fixed time that is the sum of the time required for the above-mentioned operation or recovery and the monitoring time necessary to determine that the operation or recovery has occurred.

Next, input control will be explained. First, the arithmetic and control unit 1 outputs the voltage θ1/2 of e knee (e t X 1/2 ) at point A. The input/output control section 2 checks whether there is a signal from R7 at the 0 point after a certain period of time has elapsed. In the case of this figure, in order to detect that R7 is operating at the 0 point position, the arithmetic control unit 1 reversely calculates (e, x 1 /4) plus the voltage of (6e1/8) is output. This state is the D point position. At point D, the controller waits for a certain period of time in the same manner as described above, and after the elapse of a certain period of time, at point E, the presence or absence of the R7 output signal is checked. In this case, it was detected that it was not working (
(because it is above the operating limit value), similarly to A − + B, the arithmetic control unit 1 further increases (et X
Outputs a voltage of 5e, which is the minus of the voltage of 1/8), and a voltage of /8. The position after this output is point F. The following is busy G→H9I→J, K-+L, M-4N,
If a non-operation is detected at a position where the O→P, Q→R voltage is changed, the voltage output value is minus, and if it is operating, the voltage value is output by adding a plus. Repeat. The voltage setting value at the last variable position R becomes the operating limit value of that R7. The voltage variable value at this last point E is the value a of et1512 with respect to the voltage setting value of the start point A, and is approximately 0.
The value is 2 壬. That is, this value can be said to be the measurement accuracy in this input control. I want to.

According to the above-described input control, only the number of positions at which the voltage is changed and the time required to detect the Ry ratio output are determined, which is extremely simple.

FIG. 2 is a diagram focusing on measurement time.

Each symbol in the tangzhong corresponds to that in FIG. In addition, time to
is the same as in FIG. 5, and is the sum of the operating time of RY (-1 return time) and the monitoring time necessary to determine operation (or return).

As is clear from FIG. 2, the measurement time in this example is 8t.
It is o time. On the other hand, the conventional measurement time shown in FIG. 5 is (4t, +t1 +t!+...ts), and the measurement time difference is (4to + J + +
...ts )-8t6, that is, (1, +1.+...+
ts)-4to time. As is clear from the above figures, (t, +tl+...+ts)>4 t4
As a precaution, the measurement time was extremely short. In addition, according to this embodiment, the measurement accuracy and measurement time are determined by the number of voltage changes, so it is extremely versatile.The application is not limited to voltage input only, but also It can also be applied to input or complex human power.

As described above, according to this embodiment, the number of outputs from the arithmetic and control device is small, and the operating limit value of the relay can be detected by simple response control. [Effects of the Invention] As explained above, one relay According to the invention, an initial input is applied to the Regerin test #1 device, and the operating signal and non-operating signal detected after a predetermined time reduce the value to 1/2 of the initial value that was applied until then.
, 1/4, . . . are applied as plus or minus values depending on the detection signal type, which reduces measurement time and improves measurement accuracy. It is possible to provide an input control method for test equipment that can be controlled.

[Brief explanation of drawings]

Fig. 1 is a control characteristic diagram of an embodiment to explain the input control method of the test device according to the present invention, Fig. 2 is a diagram focusing on measurement time, and Fig. 3 is an example of an undervoltage relay. FIG. 4 is a block diagram illustrating an example of an automatic protective relay test device, FIG. 4 is an input control characteristic diagram illustrating conventional input control, and FIG. 5 is a diagram illustrating measurement time of the conventional method. 1... Arithmetic control device 2... Input/output device 3...
Frequency control section 4... Late conversion section 5... Signal output control section 6... Voltage amplifier 7... Protection relay 8
...Relay output determination section Fig. 1 I Fig. 3 Fig. 4

Claims (1)

[Claims] In an input control method that provides operating limits during static characteristic tests of a device under test, an initial input is applied to the device under test,
After a certain period of time, the presence or absence of an output signal from the device under test is checked, and depending on the presence or absence of an output signal from the device under test, the initial value is 1/2, 1/4, ... 1/2^ The input value is suddenly changed by sequentially adding or subtracting the value n (n is a positive number) to the value that has been applied up to that point,
An input control method for a test device characterized by measuring the operating limit value of a device under test.