JPS60228974A - Apparatus for measuring opening and closing characteristic - Google Patents

Abstract

PURPOSE:To make it possible to enhance the accuracy of a measured value while shortening the operation time of a switching characteristic value, by providing a means for storing a stroke signal, a means for operating a closing or opening speed and a means for performing indication upon the comparison with desired data. CONSTITUTION:Formula (wherein l0 is a height at the point of time when a stroke signal was stabilized and t1, t2 are times respectively corresponding to 0.1l0-0.9l0) receives programming to be stored in RAM19 and a microprocessor 13 performs are operation of an opening and closing speed on the basis of the programming of the formula. Similarly, an opening speed can be also operated by using the falling part of the stroke signal 2a. Next, the obtained closing and opening speeds are compared with desired data preliminarily stored in ROM20 and, if non-coincidence, a display part 17 issues an alarm. If the contact of an opening and closing apparatus 1 is closed, a closing signal 2c and an opening signal 2d are inputted to the processor 13 through an interface circuit 14 and an interruption signal is inputted to a microcomputer to start the counting of a timer 15. A contact signal 2b stops the counting of the timer to which the interruption signal is inputted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for measuring switching characteristics such as closing speed and opening speed of a switching device.

[Prior art]

Conventionally, there has been a device of this type as shown in FIG. In the figure, l is a switchgear, /a is a fixed contact, /b is a movable contact, which moves in the direction of arrow F, 2 is various signals from the switchgear l, λa, λb.

, 2C, and 2d are respectively a stroke signal of the movable contact /b, a fixed/movable contact status signal, and a closing signal of the switchgear/, although not shown in the figure.

Corresponds to the open signal. 3 is an electromagnetic oscilloscope that measures these signals, ja, Jb, ? c and 3d are galvanometric oscillators that detect the respective inputs. 3e is a dry or wet oscilloscope for recording the vibration of the vibrator. The oscilloscope 3e is also a scale for calculating the results.

Next, the operation will be explained. Switchgear/movable contact lb
By moving in the direction of arrow F, the sensor (not shown)
The output is based on the input waveform. These input waveforms become input signals to the electromagnetic oscilloscope 3, and serve as inputs for vibrating each of the vibrators 3a to jd of the electromagnetic oscilloscope J. The vibrations of the vibrators 3a to 'jd are recorded on oscilloscope Je, which is dry or wet photosensitive paper. Oscilloscope Je
The recorded waveform is converted by scaling etc. and converted into a characteristic.

Next, calculations of the closing time, opening time, closing speed, and opening speed among the initial characteristics will be explained.

Figure 1 is a diagram for explaining the process of calculating the closing time, in which auxiliary lines X and Y are drawn on the closing signal 2e and contact signal 2b recorded on the oscilloscope 3e.

Read the length between the auxiliary line X-Y with a scale hiro.

The length was converted into time using the timing signal t (ms), and the input time TI was calculated.

FIG. 3 is a diagram for explaining the process of calculating the opening time, and as in the calculation of the closing time, the contact signal 2b and the opening signal -d are connected to auxiliary lines! , Y' are omitted and the opening time T is calculated. Figure 1 is a diagram to explain the process of calculating the closing speed. Write -P on the auxiliary line and calculate. Note that tO is the height at the time when the stroke signal core a becomes stable.

The opening speed was also calculated in the same manner as the closing speed using equation (1) by writing an auxiliary line at the falling edge of the stroke signal 2a.

The closing time and opening time obtained in this way.

The quality of the switching device 1 was determined by determining whether the calculated values of the closing speed and the opening speed were in a desirable state.

Since the conventional switching characteristic measuring device has one or more configurations, manual labor is required from measurement using an electromagnetic oscilloscope to obtaining the calculation result. Therefore, ■It takes too much time to calculate various properties. ■The calculation results vary depending on the person performing the measurement.■It is not possible to immediately determine whether the results are normal or abnormal.■Calculations cannot be performed without an oscilloscope made of photosensitive paper.■The price is low because the oscilloscope is photosensitive paper. There was a problem with the first grade being expensive and having poor storage stability.

[Summary of the invention]

The present invention was made in order to eliminate the drawbacks of the conventional ones as described above, and provides a switching characteristic measuring device that can perform everything from calculation to display and recording instantly without using an electromagnetic oscilloscope. It is intended to.

As a technical means to achieve this object, the switching characteristic measuring device according to the present invention is an apparatus that measures the characteristics of the switching device by inputting an electrical stroke signal of the switching device.
It has a configuration characterized in that it comprises means for sampling and storing the stroke signal, and means for comparing it with the sampled and stored desired closing speed or opening speed and indicating the result. In addition, in a device that measures the characteristics of the switchgear by inputting an electrical contact signal of the switchgear and a closing or opening signal, each of the contacts starts from the rising start time of the closing or opening signal. means for counting the closing or opening time up to the rising or falling time of the signal; and means for comparing the closing or opening times with respective pre-stored desired closing or opening times and indicating the result. It also has a configuration characterized by the following.

[Embodiments of the invention]

The present invention will be explained below based on a preferred embodiment thereof.

In FIG. 3, l and C indicate a switching device and an input waveform, respectively, as in FIG. 1. 3 is a switching characteristic measuring device of the present invention, which includes a level converter section/t, an A/D converter section saw, and a microprocessor section 13. And inner face part lψ
, timer part lj, and display selection switch/A, LE
It consists of a CD display section/7 and a recording section IT.

Further, a RAM/9 and a ROM-0 are connected to the microprocessor-3.

Next, the operation of the switching characteristic measuring device of the present invention shown in FIG. S will be explained.

In the conventional case, the input signal waveform λ input to the switching characteristic device IO is the actual width. Among these input signals, the stroke signal is a voltage signal that changes as a potentiometer (not shown) attached to the contact of the switchgear l rotates due to the movement of the contact, so it is a voltage input proportional to the movement of the contact. A after level conversion with level converter //
/D converter/, 2, and the sampling result is stored in RAM/D. This sampling interval (for example 2rIL seconds) is synchronized with the timer 5.

Furthermore, by programming equation (1), RAM/Denki 2
1. Based on this calculation formula (1), the microprocessor 13 calculates the opening/closing speed.

This calculation method first takes the voltage V (7 (volts)) at the point when there is no change in the voltage input of the stroke signal core a, and converts this into the length Lo (am) by the microprocessor/3 using the conversion constant stored in the ROMJO. Convert to

Next, time iJ and tl corresponding to 0.910 and θ/lθ are searched from the sampling data already stored in RAM/9. This is because the sampling data is synchronized with the time base of timer l, so each at
It is possible to search for times iJ and tl corresponding to to and θ/10. Thus o, g t.

By calculating 1J-j/, the feeding speed can be obtained.

The opening speed can also be calculated in the same way using the falling portion of the stroke signal.

Next, the closing or opening speed calculated in this way,
Compare the desired closing or opening speed stored in advance on the ROM/f, and if the desired speed is not reached, the LED will be displayed on the display.
It emits light and issues an alarm.

On the other hand, the closing signal 2C and the opening signal = d are level input signals, and when the contact of the switchgear is closed (opened), an interrupt signal is sent to the microcomputer via the interface circuit Lda and the microprocessor-130 interrupt terminal INT. is entered in
The timer is starts counting. This is the auxiliary line X in Figures 1 and 3.

This is the time corresponding to X'.

On the other hand, the contact signal b is also a level input and is connected to the interrupt terminal rNT. When a signal is input to this interrupt terminal IN'I', the count of timer /j is stopped. This is the auxiliary line Y in Figures 1 and 3.

This is the time corresponding to Y'.

In this way, the closing time TI and opening time T as shown in FIGS. 2 and 3 are calculated, and the RAM
/? is memorized.

Since the desired closing time and opening time are also stored in the ROM 20, the microprocessor 13 compares the desired closing time TI and opening time Ta with the above-described desired closing time TI and opening time Ta to determine the quality. If this is not desired, a warning light can be activated on the display.

Selection between the closing time and speed display and the opening time and speed display is performed by the 1 selection switch 16 in accordance with the flowchart shown in FIG. In addition, mode switching in the figure is a switching step to distinguish whether the switchgear l is in closing mode or opening mode.As shown in the figure, in each mode, both speed and time are sequentially calculated and alarms are issued as appropriate. In the above embodiment, one display element is an LED,
and uses a printer as a recording element, but IJD
Other elements such as a liquid crystal may be used, or a magnetic memory may be used instead of a printer.

Further, elements such as determining the quality of calculation results and recording may be locked as necessary.

〔Effect of the invention〕

As described above, according to the present invention, the opening/closing characteristic values are calculated immediately, so the calculation time is greatly shortened, and since no human labor is required for the calculation, the accuracy of the measured values is improved, and the results Since the quality of the recording paper is also determined at the same time and photosensitive paper is not used for recording, it is possible to improve the storage stability of the recording and to reduce the cost of the recording paper.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing a conventional device for measuring switching characteristics. Figure 2 is a diagram for explaining the process of calculating the closing time of a switchgear. Figure 3 is a diagram showing the opening and closing time of a switchgear. A diagram for explaining the process of calculating time, Figure 1 is a diagram for explaining the process of calculating the closing speed of the switching device, Figure S is a block diagram showing the switching characteristic measuring device according to the present invention, and FIG. 6 is a flowchart showing the selection operation by the selection switch used when measuring the closing speed or opening speed in FIG. 3. In the figure, l...Switching device, 10...Switching characteristic measuring device, /
3@・Microprocessor-115・・Timer, 16・
- Display selection switch, / - Display unit, ig... Recording unit, 19 - RAM, KO... ROM. In Figure 1, the same reference numerals indicate the same or equivalent parts. I saw 2 figures and almost 3 figures of Bitoco Gudei! -(1-1-Nee-1-1-Nee-Nee-Nee 1-Nee-Nee-1-11-bi 4 Figure

Claims (1)

[Scope of Claims] (1) A device for inputting an electrical stroke signal of a switchgear to measure the characteristics of the switchgear, including means for sampling and storing the stroke signal, and means for inputting or storing the stroke signal from the sampling signal. The device comprises means for calculating a contact opening speed, and means for comparing the calculated closing speed or opening speed with a desired closing speed or opening speed stored in advance, respectively, and instructing the result. Characteristic switching characteristics measuring device. (2) The means for calculating the input speed corresponds to means for converting an electric signal when the stroke signal is saturated into a length signal using a predetermined conversion constant, and 09 times and 07 times the length signal, respectively. means for searching the stored sampling data for a rising time of the stroke signal; and means for dividing a value 0.1 times the length signal by the time of both times to obtain the feeding speed. A switchgear characteristic device according to claim 1. (J) The means for calculating the opening speed includes means for converting an electric signal when the stroke signal is saturated into a length signal using a predetermined conversion constant, and a means for calculating the opening speed by 0.7 times and 0.7 times the length signal. means for searching the stored sampling data for falling times of the respective corresponding stroke signals; and means for dividing a value multiplied by Ot of the length signal by the time of both times to obtain the opening speed. A switchgear characteristic device according to claim 1, comprising the following. (Hiroshi) The instruction means includes means for switching between a closing mode and an opening mode, and means for issuing an alarm when the closing speed is not at the desired closing speed. A switching characteristic measuring device according to claim 7, comprising: (j) The indication means includes means for switching between closing mode and opening mode, and means for issuing an alarm when the opening speed is not at the desired opening speed. The switching characteristic measuring device according to item 1. (6) Device 1 (which measures the characteristics of the switchgear by inputting the electrical contact signal and the closing or opening signal of the switchgear)
means for counting the closing or opening time from the rising start time of the closing or opening signal to the rising or falling time of the contact signal, respectively; 1. A switching characteristic measuring device comprising means for comparing the result with a desired closing or opening time and indicating the result. (ff) The scope of the present invention is characterized in that the instruction means includes means for switching between closing mode and open mode, and means for issuing an alarm when the closing time is not within the desired closing time. The switching characteristic measuring device according to item 6. (f) The indication means includes means for switching between closing mode and opening mode, and means for issuing an alarm when the opening time is not within the desired opening time. The switching characteristic measuring device according to item 6.