JPH05281272A - Automatic insulation resistance measuring device - Google Patents

Abstract

PURPOSE:To make insulation resistance measurement automatic so as to mechanize the nondefectiveness judgement for the insulation resistance as well as simplify its indication. CONSTITUTION:The title consists of a clock circuit 1 that counts clock pulse and transfers a measurement start signal when it reaches the specified number of counts, a measurement and judgement circuit 2 that generates test voltage by the measurement start signal from the circuit 1 to measure the insulation resistance of a circuit 11 to be measured based on the test voltage as well as compare the measured value with a specified reference value and judges whether or not it exists within the range of reference value, and transfers the judgement result, and a display circuit that indicates conformity of the insulation resistance in the circuit 11 based on the output from the circuit 2. Further, an external interlock circuit 15 is installed between the circuits 1 and 2 to release an automatic measuring status, and a holding circuit 17 is also installed between the circuits 2 and 3 to lutch the displaying status at the circuit 3 until next measurement start signal is inputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulation resistance automatic measuring device, for example, an electric device installed to control electric equipment such as opening and closing of a floodgate used for power generation, water utilization, water discharge and tide protection business. The present invention relates to an insulation resistance automatic measuring device for automatically measuring the insulation resistance of an electrical product in order to recognize a deterioration state.

[0002]

2. Description of the Related Art For example, in the management of floodgates used for power generation, water usage, water discharge, tide protection, etc., various electric appliances installed to control electrical equipment such as opening and closing of the floodgates are regularly maintained. There is a need. As one of the maintenance items of these electric products, there is insulation resistance measurement for recognizing the deterioration state of the electric products.

Conventionally, this insulation resistance measurement is performed by an operator using an insulation resistance meter called a mega tester. Specifically, a measurement probe of an insulation resistance meter is connected to a circuit to be measured in an electrical product at a predetermined location of the electrical product, and the insulation resistance meter is provided with 100.
The insulation resistance in the circuit under test is measured based on a test voltage of about 500 V, and the measured resistance value is read. Then, the operator compares the resistance value read from the insulation resistance tester with a reference value based on an electrical technology standard or a standard independently set, and determines whether or not the resistance value is within the reference value. ..

[0004]

By the way, in the conventional insulation resistance measurement, an operator uses an insulation resistance meter every one month, six months, or one year, and the measurement probe of the insulation resistance meter is used as an electrical component. It is necessary to measure the insulation resistance by connecting it to a predetermined position and to compare the read measurement value with a preset reference value to determine the good or bad.

Therefore, in handling the insulation resistance tester, the worker is required to have a skill level having specialized knowledge like an electric engineer, and a human being who depends on such worker is required. Measurement is very inefficient and labor costs rise sharply. Further, as described above, the measurement period is usually one month, six months, or once a year, so it is difficult to grasp the state between the inspection intervals. For example, immediately after the periodic inspection. When the insulation resistance is in a defective state, there is a problem that the defective state cannot be recognized until the next regular inspection, resulting in a lack of safety.

Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to automate the insulation resistance measurement, mechanize the determination of the insulation resistance, and to simplify the display. An object of the present invention is to provide an insulation resistance automatic measuring device that facilitates the construction of an automatic inspection system.

[0007]

As a technical means for achieving the above object, the present invention is a clock circuit which counts clock pulses and sends a measurement start signal when a predetermined count is reached, A test voltage is generated by the measurement start signal of the clock circuit, the insulation resistance of the circuit under test is measured based on the test voltage, and the measured value is compared with a preset reference value to make a determination. And a display circuit for displaying the quality of the insulation resistance of the circuit under test based on the output of the measurement / judgment circuit.

In the present invention, an external interlock circuit for releasing the automatic measurement state is provided between the clock circuit and the measurement / judgment circuit, or between the measurement / judgment circuit and the display circuit. It is desirable to attach a holding circuit for latching the display state of the display circuit until the next measurement start signal is input.

[0009]

The automatic insulation resistance measuring device according to the present invention has the following actions with the above-mentioned constituent circuits.

First, the measurement interval is automatically set by the clock circuit. That is, by counting the clock pulses, the measurement start signal is sent for each predetermined count number,
The interval at which this measurement start signal is transmitted becomes the measurement interval.

In the measurement / judgment circuit, a test voltage is generated each time the measurement start signal is input, the insulation resistance of the circuit under test is measured based on the test voltage, and the measured value is preset. It is judged by comparing it with the reference value and the judgment result is sent out.

In the display circuit, when the output of the measurement / judgment circuit is input, the quality of the insulation resistance in the circuit under test is simplified and displayed based on the input.

If an external interlock circuit is provided between the timepiece circuit and the measurement / judgment circuit, the measurement start signal from the timepiece circuit can be cut off to cancel the automatic measurement state. If a holding circuit is attached between the measurement / judgment circuit and the display circuit, the interval at which the measurement start signal is sequentially input from the clock circuit,
That is, the display state on the display circuit can be latched during the measurement interval.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automatic insulation resistance measuring device according to the present invention will be described with reference to FIG.

The insulation resistance automatic measuring device of the present invention counts clock pulses and sends a measurement start signal when a predetermined number of counts is reached, and a clock circuit (1) performs a test by the measurement start signal of the clock circuit. Generate a voltage, measure the insulation resistance of the circuit under test based on the test voltage and determine by comparing the measured value with a preset reference value,
The main part is composed of a measurement / judgment circuit (2) that sends out the judgment result and a display circuit (3) that displays the quality of the insulation resistance of the circuit under test based on the output of the measurement / judgment circuit. It

Specifically, the circuit configuration of the above-mentioned insulation resistance automatic measuring device is as follows.

The clock circuit (1) is connected to the power supply circuit (4) and uses a pulse train with a constant oscillation period as a reference for setting the insulation resistance measurement interval, for example, every 1 hour or 24 hours. A clock pulse oscillating circuit (5) to generate, a counting circuit (6) connected to the clock pulse oscillating circuit (5) for counting the number of pulses output from the clock pulse oscillating circuit (5), and this counting circuit ( 6), the number of pulses in the clock pulse oscillation circuit (5) is counted by the counting circuit (6) in order to set the insulation resistance measurement interval as described above, and the count number is a predetermined value, that is, For example, it is composed of a sampling interval setting circuit (7) for outputting a measurement start signal from the counting circuit (6) when the count number corresponding to the elapse of 1 hour or 24 hours is reached.

The clock circuit (1) has a built-in adjustment reset circuit (8) which is connected to the clock pulse oscillation circuit (5) and resets the generation of the pulse train to the initial state. In addition, it is connected to the counter circuit (6) and has a function similar to the sampling interval setting circuit (7) so that insulation resistance measurement can be performed at any time. Manual circuit for arbitrary measurement (9)
Is attached externally.

Next, the measurement / judgment circuit (2) is connected to the counting circuit (6) of the clock circuit (1) through an external interlock circuit, which will be described later, and the AC10 in the power supply circuit (4) is connected.
Power supply voltage such as 0V or 200V is used for insulation resistance measurement D
A test voltage generation circuit (10) for generating a test voltage of C100 to 500V, and an insulation resistance measurement circuit (12) connected to the test voltage generation circuit (10) and performing insulation resistance measurement in a circuit under test (11). ) Is connected to the insulation resistance measuring circuit (12) and compares the measured value obtained by the insulation resistance measuring circuit (12) with a preset reference value for judgment and outputs the judgment result. A judgment circuit (13) and a setting circuit (14) which is connected to the comparison judgment circuit (13) and which sets and inputs a low level reference value and a high level reference value [described later] of the insulation resistance to the comparison judgment circuit (13). Composed of and.

The display circuit (3) is connected to the comparison / determination circuit (13) via a switching circuit and a holding circuit, which will be described later, and is provided with, for example, green, yellow and red lamps, which are not shown. ..

The insulation resistance automatic measuring device has the following constituent circuits in addition to the main circuit structure comprising the clock circuit (1), the measuring / judging circuit (2) and the display circuit (3).

First, an external interlock circuit (15) is provided between the counting circuit (6) of the clock circuit (1) and the test voltage generating circuit (10) of the measuring / judging circuit (2). The external interlock circuit (15) interrupts the output signal from the counting circuit (6) so that it is not input to the test voltage generating circuit (10), and releases the automatic measurement state.

Further, in the case where a plurality of circuits to be measured (11) are provided so that there are a No. 1 motor and a No. 2 motor as electric components installed for controlling the opening and closing of the water gate, the measurement / judgment circuit is provided. (2) Insulation resistance measurement circuit (12)
A switching circuit (16) is provided between the circuit under test (11) and the circuit under test (11), and between the comparison / determination circuit (13) and the display circuit (3). The switching circuit (16) changes the insulation resistance measuring circuit (12) to a desired circuit under measurement (11) and a comparison / determination circuit (at a switching timing when the measurement start signal is output from the counting circuit (6). 13) are switched and connected to desired display circuits (3).

Further, a holding circuit (17) is connected between the switching circuit (16) and the display circuit (3) so as to correspond to the display circuit (3). The holding circuit (17) latches the display state of the display circuit (3) at the determination timing when the measurement start signal is output from the counting circuit (6) until the next measurement start signal is input.

An external output circuit (18) is connected to each holding circuit (17) so that the external output circuit (18) can output the judgment result of the insulation resistance measurement to a peripheral device (not shown). ing.

Next, the operation of the insulation resistance automatic measuring device having the above structure will be described below.

First, in the clock circuit (1), the power supply circuit (4)
A constant pulse train is constantly generated from the clock pulse oscillation circuit (5) based on the power supply voltage of the, and the number of pulses in the pulse train is counted by the counting circuit (6). Then, every time the number of pulses reaches a predetermined value by the signal from the sampling interval setting circuit (7), that is, one hour or
A measurement start signal is output from the counting circuit (6) every time a measurement interval such as 24 hours elapses.

If the automatic measurement state has not been released by the external interlock circuit (15), the measurement start signal from the counting circuit (6) is sent to the external interlock circuit (1).
It is sent as it is via 5) and input to the measurement / judgment circuit (2).

In the measurement / judgment circuit (2), the test voltage [DC100 to 500V] based on the power supply voltage [AC100V, 200V, etc.] of the power supply circuit (4) is generated by the test voltage generation circuit (10) by the measurement start signal. It is generated and output to the insulation resistance measuring circuit (12). The insulation resistance in the circuit under test (11) is measured by this insulation resistance measuring circuit (12). At this time, the desired circuit under measurement (11) is selected by switching the contacts in the switching circuit (16) at the switching timing from the counting circuit (6). The circuit under test (1
When the insulation resistance in 1) is measured, the measured value is output from the insulation resistance measurement circuit (12) to the comparison judgment circuit (13),
The above-mentioned measured value and setting circuit (1
4) Compare the reference value set in advance with the reference value set in advance, and determine by comparing the range of the measured value between the low level reference value and the high level reference value. At this time, the counting circuit (6)
The desired holding circuit (17) and display circuit (3) are selected by switching the contacts in the switching circuit (16) at the determination timing from (1).

The judgment result compared by the comparison judgment circuit (13) is sent to the display circuit (3) through the holding circuit (17) and displayed on the display circuit (3). For example, the low-level reference value set by the setting circuit () is set as the standard value based on the electrical equipment technical standard, and the high-level reference value is set as the independently determined limit value. Regarding the above judgment result, if the measured value is above the high level reference value, the green lamp is turned on to indicate that the insulation resistance is in good condition, and if it is below the low level reference value, the red lamp is displayed. When it is turned on, it indicates that the insulation resistance is in a defective state. And
If the measured value is between the high-level reference value and the low-level reference value, the yellow lamp is turned on to display that the insulation resistance is in a good state but is close to a bad state, and therefore caution is required. In this way, the determination result is recognized by a simple display indicating whether or not the green, yellow, and red lamps are lit.

The insulation resistance is measured for the other circuits under test (11) in the same manner as described above, and the circuits under test (11) are switched at the switching timing from the counter circuit (6) and the determination timing. Therefore, it is performed by switching the contacts in the switching circuit (16).

When the generation of the pulse train in the clock pulse oscillation circuit (5) of the clock circuit (1) is returned to the initial state, it is adjusted by the reset circuit (8). Also, if you want to measure the insulation resistance arbitrarily, you can output the measurement start signal from the counting circuit (6) by the manual circuit (9) at any time, and in the same way as above, display the judgment result on the display circuit (3). Can be displayed at any time.

The above explanation is about automatic measurement.
For example, when the operator controls the opening and closing of the water gate, the external interlock circuit (15) is activated when the door is opened to operate the control panel, and the measurement start signal output from the counting circuit (6) is cut off. The automatic measurement state can be canceled so that the test voltage is not generated in the test voltage generation circuit (10).

Further, the external output circuit (18) provided together with the display circuit (3) sends the judgment result output from the comparison judgment circuit (13) to peripheral equipment or the like. With this, for example, when connected to an alarm device as one of the peripheral devices,
When the result of the determination indicates that the insulation is defective, the alarm device can be automatically activated to promptly notify the abnormal state. Further, if the information based on the above determination result is transmitted from the external output circuit (18) through the communication line, it becomes possible to centrally and remotely monitor the sluice gate facility, thereby constructing a sluice gate management system. It will be easy to realize.

In the above embodiment, the case of measuring the insulation resistance of an electrical product installed to control the opening and closing of the water gate in order to recognize the deterioration state of the electrical product has been described, but the present invention is not limited to this. Needless to say, the present invention can be applied to automatic measurement of insulation resistance in electrical products other than those described above.

[0036]

According to the insulation resistance automatic measuring device of the present invention, the insulation resistance can be automatically measured at all times, and at the same time, whether the insulation resistance is good or bad can be completely mechanized.
Since the worker does not have to handle the insulation resistance tester, it is very efficient because it does not depend on the human measurement by the worker, the labor cost can be reduced, and the systemization can be facilitated. Can be always grasped, and the safety is greatly improved. Moreover, since the display can be simplified, the operator does not need to have the skill level having specialized knowledge like an electrician.

[Brief description of drawings]

FIG. 1 is a circuit configuration block diagram showing an embodiment of an insulation resistance automatic measuring device according to the present invention.

[Explanation of symbols]

 1 Clock circuit 2 Measurement / judgment circuit 3 Display circuit 11 Circuit under test 15 External interlock circuit 17 Holding circuit

Claims (3)

[Claims] 1. A clock circuit that counts clock pulses and sends a measurement start signal when a predetermined count is reached, and a test voltage is generated by the measurement start signal of the clock circuit, and a test voltage is generated based on the test voltage. The insulation resistance of the measurement circuit is measured, and the measured value is compared with a preset reference value to make a judgment, and the measurement / judgment circuit that sends the judgment result and the output based on the measurement / judgment circuit An automatic insulation resistance measuring device, comprising: a display circuit for displaying the quality of insulation resistance in the measurement circuit. 2. An automatic insulation resistance measuring device, wherein an external interlock circuit for canceling an automatic measurement state is provided between the timepiece circuit according to claim 1 and the measuring / judging circuit. 3. A holding circuit is provided between the measurement / judgment circuit according to claim 1 and the display circuit for latching a display state of the display circuit until a next measurement start signal is input. Insulation resistance automatic measuring device.