JPS63115073A - Operation monitoring device for electronic equipment - Google Patents

Abstract

PURPOSE:To detect abnormality of a breaker even if an electromagnetic coil is broken by dividing the terminal voltage across the electromagnetic coil and measuring the operation time of electric equipment from the voltage division output. CONSTITUTION:A breaking mechanism which is not shown in a figure is operated through the lead-out coil 1 of the breaker 1 and a switch 2 is opened to cut off electric feeding to the coil 1. The terminal voltage across the coil 1 is divided to develop a voltage proportional to the coil voltage across a resistance 6b, and the voltage is inputted to a decision means 4. The output of a comparator 8 is supplied to a timer 9, whose pulse time width is measured. This pulse time width is monitored by a decision device 10 to judge whether the breaker is normal or not. Then if the coil 1 is broken, a voltage is developed across the coil 1, but the breaking mechanism does not operate, so the switch 2 is not opened. The pulse time width measured by the timer 9, therefore, increases abnormally, so the fault of the breaker is detected from the time width of the pulse even if the coil is broken.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device that measures the pulse width of a command signal to monitor the operating state of a circuit breaker or the like.

[Prior Art] In order to determine abnormalities in the operation of electrical equipment such as circuit breakers, monitoring of the pulse width of the on/off command current has been conventionally performed.

FIG. 3 shows a conventional monitoring device disclosed in Japanese Patent Application Laid-Open No. 61-108118. When a command signal is applied to the tripping coil 1 of the breaker, the tripping coil 1 activates the breaker mechanism (not shown). ) is activated.

When the cutoff operation is completed, the switch 2 is opened and the current to the tripping coil 1 is cut off. The current flowing through the tripping coil 1 is detected by the current transformer 40 and produces a voltage across the shell resistor 50 as shown in FIG. 5A. This voltage is input to comparator 8.

The comparator 8 outputs an output when this voltage exceeds the threshold value Th (see Fig. 4 A and B). @4 The output of the comparator 8 shown in Figure B is input to the timer 9, and its pulse time width T is measured. By monitoring this pulse time width T by the determiner 10, it is determined whether the breaker is normal or abnormal. That is, if the shutdown time is delayed due to an abnormality in the circuit breaker, this can be detected.

[Problems to be Solved by the Invention] The conventional monitoring device detects that current flows through the tripping coil 1, recognizes that there is a shutdown command, and determines whether the breaker is normal or not based on the current. Determining abnormality. By the way, when the tripping coil 1 is disconnected, no current flows. Therefore, conventional monitoring devices could not detect an abnormality in such a case.

An object of the present invention is to solve the above-mentioned problems and provide a monitoring device capable of detecting an abnormality even when a coil is disconnected.

[Means for Solving the Problems] A monitoring device for electrical equipment according to the present invention includes voltage dividing means for dividing and outputting the terminal voltage of an electromagnetic coil, and also detects electricity based on the divided voltage output of the voltage dividing means. The device is equipped with measurement and determination means for measuring and determining the operating time of the device.

[Function] The voltage dividing means that divides the terminal voltage of the electromagnetic coil has an effect of outputting a voltage corresponding to the voltage applied to the electromagnetic coil even when the electromagnetic coil is disconnected.

[Embodiment] An embodiment of the present invention is shown in FIG. 1. A voltage dividing means 6 is connected to both ends of a tripping coil 1 which is an electromagnetic coil. In this embodiment, a voltage dividing means is constituted by a resistor 6a and a resistor 6b.

Command signal 2 to tripping coil l of breaker! When the current flows, a new mechanism (not shown) is activated by the tripping coil 1.
is activated. When the cut-off operation is completed, the switch 2, which is a switch means, is opened and the energization to the tripping coil 1 is cut off. The voltage across the tripping coil 1 is divided by the voltage dividing means 6, and a voltage proportional to the coil voltage is generated across the resistor 6b. This voltage shown in FIG. 2A is input to the measurement and determination means 4. In this embodiment, the measurement determination means 4 is composed of a comparator 8, a timer 9, and a determination device IO. The comparator 8 outputs an output when this voltage exceeds the threshold value Th (see Fig. 2A).
, B), the output of the comparator 8 shown in FIG. 2B is input to a timer 9, and its pulse time width T is measured. By monitoring this pulse time width T by the determiner 10, it is determined whether the breaker is normal or abnormal. That is, if the shutdown time is delayed due to an abnormality in the circuit breaker, this can be detected.

Next, a detection operation when the tripping coil l is disconnected will be described. In this case, although a voltage is generated across the coil 10, the switch 2 does not open because the switching mechanism does not operate, and the voltage across the resistor 6b becomes as shown in FIG. 2C. Therefore, the pulse time width T measured by the timer 9 becomes abnormally large, and a failure can be detected.

In the above embodiment, the tripping coil was explained 2!
lt, it can also be applied to a closing coil as another embodiment. Moreover, it can be applied to electrical equipment other than circuit breakers having electromagnetic coils.

It should be noted that as the voltage dividing means, something other than a resistive voltage divider may be used.

[Effects of the Invention] The monitoring device for electrical equipment according to the present invention includes voltage dividing means for dividing and outputting the terminal voltage of an electromagnetic coil, and makes a determination based on the output of the voltage dividing means.

Therefore, even if the electromagnetic coil is disconnected, this can be detected.

That is, it is possible to provide a highly reliable monitoring device for electrical equipment.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a circuit of a monitoring device for electrical equipment according to an embodiment of the present invention, FIG. 2 is a diagram showing waveforms flowing through the circuit of FIG. 1, and FIG. 3 is a diagram showing a circuit of a conventional monitoring device. Figure, 4th
The figure is a diagram showing waveforms flowing through the circuit of FIG. 3. 1 is a tripping coil, 2 is a switch, 4 is a measuring means, and 6a and 61) are resistors. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Claims] (1) An electromagnetic coil provided to perform a predetermined operation of an electrical device in response to a command signal, a switch means that cuts off the supply of current to the electromagnetic coil when the predetermined operation of the electrical device is completed, and a terminal voltage of the electromagnetic coil. 1. An operation monitoring device for electrical equipment, comprising: a voltage dividing means for dividing and outputting a voltage; and a measuring and determining means for measuring and determining the operating time of the electrical equipment based on the partial pressure output of the voltage dividing means. (2) The apparatus for monitoring the operation of an electrical device according to claim 1, wherein the predetermined operation of the electrical device is a turning on and a cutting off operation.