JPS63157068A - Monitoring device for electric equipment operation - Google Patents

Abstract

PURPOSE:To detect the breaking of a wire irrelevantly to operation command by providing an LED for detecting the breaking of the wire between the positive electrode side of electric equipment and the positive electrode side of a control power source. CONSTITUTION:One terminal of a suppression resistance 16 which suppresses a current flowing to the LED 15 for wire breaking detection is connected to the plus side of the control power source 13, and the other terminal is connected to the anode of the LED 15. When a disconnection command circuit 1 is in a stand-by state, namely, when an auxiliary switch 12 is in a making state, a current flows from the positive electrode side of the power source 13 to the negative electrode side of the power source 13 through the resistance 16, the LED 15, a trip coil 2, and a switch 12. This current is adjusted by the resistance 16 so that it is large enough to turn on the LED 15 and small enough not to operate the coil 2. The light output of the LED 15 is inputted to a decision device 10A through an optical fiber 17, so the decision device 10A decides abnormality because the light input is not transmitted from the optical fiber 17 if there is abnormality such as the breaking of the coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrical equipment operation monitoring device, and particularly to an electrical equipment operation monitoring device that monitors the presence or absence of abnormal operation of electrical equipment such as switching equipment.

[Conventional technology]

FIG. 3 is a schematic diagram of a conventional electrical equipment operation monitoring device disclosed in, for example, Japanese Patent Application Laid-Open No. 1999-1010-1. In the figure, an operation command circuit (1) for an electrical device such as a circuit breaker (not shown) includes a circuit breaker (11) connected in series, a circuit breaker coil (11), and a trip coil (1). ) and auxiliary switch (lλ)
It consists of

(3) is a current sensor for detecting the direct current flowing through the cutoff command circuit (1), and is provided so as to be interlinked with the cutoff command circuit (1).悴) is a signal amplifier that amplifies the detection signal from the flow sensor (3), and is connected to the output side of the current sensor (3). (j) is a waveform shaping comparator for shaping the signal from the five signal amplifiers into a waveform, and its input side is connected to the output side of the five signal amplifiers. (6) is an operation monitoring light emitting diode that is emitted by the output signal from the waveform shaping comparator (j), and its anode is connected to the waveform shaping comparator ljl, and its cathode is connected to the ground. (7) is an optical fiber for transmitting the optical signal from the operation monitoring light emitting diode (6). (r)H is a photodiode for receiving light that receives the optical signal transmitted by this optical fiber ((7), and its cathode is grounded.(r) is the input side of the photodiode for receiving light (r). This is a timer that measures the time width (tl) of the output signal of the light-receiving photodiode (f). (/(7) is a determiner that determines whether it is normal or abnormal from the time signal of this timer (ri). (13) is a control power supply connected between both ends of the cutoff command circuit (C).

Figure 1 is a diagram showing operating waveforms of a conventional electrical equipment operation monitoring device.

A conventional electrical equipment operation monitoring device is configured as described above.
When the cutoff command switch (ll) is turned on, the control power supply (
ll current flows from the positive side ■ of /3) to the negative side θ of the control power supply (/3) through the cutoff command circuit, that is, the turned-on cutoff command switch (ll), the trip coil (2), and the auxiliary switch (/, ?). flows. When the circuit breaker operates due to this circuit breaker command, the auxiliary switch (/C) operates, and the current in this circuit breaker (/1) is interrupted, completing the operation of the circuit breaker. The wL flow sensor (3) installed at and amplify it to the required signal level.Then, the waveform rigid comparator (j)
This amplified output signal is input to the input signal, and is shaped into a rectangular wave by comparing it with a threshold level (Th level) and output. This shaped waveform output signal drives the light emitting diode (6) for operation monitoring, and the optical signal that is this output signal is transmitted through the optical fiber (7) and received by the photodiode +71 for light reception. The time width (tl) of the output signal from the photodiode is measured by a timer. Based on the measurement result of this time width, the judge (10) determines whether the circuit breaker is operating normally and rarely, or abnormally. Determine and display as necessary.

[Problem that the invention seeks to solve]

With conventional electrical equipment operation monitoring devices, if the trip coil or the winding of the motor as an electrical device is broken, not only will the device not operate, but the electrical equipment operation monitoring device will not detect direct current. Therefore, not only is it impossible to determine whether there is an abnormality, but it is also discovered that the device does not operate until after the operation command is given, and it is not possible to determine whether there is an abnormality before a serious situation arises. was there.

The present invention was made to solve this problem, and detects disconnection of the electromagnetic coil and discontinuity of the cutoff command circuit including the electromagnetic coil in a state where an operation command is expected regardless of the operation command. It is an object of the present invention to provide an electrical equipment operation monitoring device that can detect operational abnormalities over a wider range and in advance.

[Means for Solving the Problems] The electrical equipment operation monitoring device according to the present invention includes a light emitting diode for detecting disconnection connected between the positive electrode side of the electrical equipment and the positive electrode side of the control power source, and a light emitting diode for detecting disconnection. A suppression resistor connected in series with the light emitting diode to suppress the current of the light emitting diode for detecting disconnection, an optical fiber for transmitting the optical output from the light emitting diode for detecting disconnection, and a Equipped with a detector that not only determines whether the cutoff command circuit is normal or abnormal, but also detects disconnection of electrical equipment, by monitoring the lighting of the light emitting diode for M-ray detection when an optical signal is input. I can buy things.

[Function] In the present invention, a disconnection in the electrical equipment can be detected by the disconnection detection light emitting diode before giving an operation command to the disconnection command circuit.

〔Example〕

FIG. 1 is a schematic diagram of an embodiment of an electrical equipment operation monitoring device according to the present invention. In the figure, (ha~(ri1, (l
Each of the parts 1) to (13) is the same as or equivalent to the conventional example shown above, and therefore the explanation thereof will be omitted. (/j) is a light emitting diode for detecting disconnection, and its cathode is connected to the connection point between the cutoff command switch (/l) and the trip coil (2). (/Otsu)
is a light emitting diode for detecting disconnection (it is a suppressing resistor that suppresses the current flowing in
) side and the other end are light emitting diodes for disconnection detection (/
connected to the other anode. (17) is an optical fiber that transmits the optical output of the light emitting diode (/j) for detecting a disconnection, and is directly connected to the determiner (toA) provided with an optical input section.

FIG. 2 is a diagram showing operating waveforms of an embodiment of the present invention.

In the electrical equipment operation monitoring device configured as described above, when the cutoff command circuit (1) is in the standby state, that is, when the auxiliary switch (/2) is in the on state K;h, the positive terminal of the control power supply (13) A current flows from the side 3 to the negative side θ of the control wL source (/3) through the suppression resistor (16), the light emitting diode for disconnection detection (/j), the trip coil (λ), and the auxiliary switch (12). This current is a current value that is sufficient to light up the light emitting diode (/j) for disconnection detection and does not operate the trip coil (for example, lOm).
Adjust the suppression resistance (/L) so that it is approximately A). The light output of the light emitting diode (/j) for disconnection detection is input to the determination device (toA) through the optical fiber (17), so the determination device (70 people) detects when there is an abnormality such as a coil disconnection or a defective connection. Since no optical input is transmitted from the optical fiber (/7), it can be determined that there is an abnormality.

The subsequent operations are as described with reference to FIG.

Although the above embodiment has been explained by taking the circuit breaker's circuit breaker as an example, the operation and disconnection of the motor circuit can be monitored in exactly the same way even in circuits that operate a motor, such as a circuit breaker. It goes without saying that the present invention can also be applied to a closing command circuit for a circuit breaker.

Furthermore, when monitoring the current waveform, if the distance between the target TI device and the determiner is not too far, a light emitting diode,
The same effect can be achieved even if an electric signal is directly sent instead of the photodiode, and a 6-wire configuration is possible for details such as the signal amplifier.

〔Effect of the invention〕

As explained above, this invention is provided with a light emitting diode for detecting disconnection between the positive electrode side of the electrical equipment and the positive electrode side of the control power source, so disconnection can be detected regardless of the operation command. This has the effect of providing an electrical equipment operation monitoring device with a high monitoring effect.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing an embodiment of the present invention, Fig. 2 is a diagram of a modified operation of the above embodiment, Fig. 3 is a schematic diagram of a conventional electrical equipment operation monitoring device, and Fig. 3 is a schematic diagram of a conventional electrical equipment operation monitoring device. It is an operation waveform diagram. (1)... Cutoff command circuit, (2)... Trip coil,
fil-e current sensor, signal amplifier, (ri)
Comparator for fist waveform, (6)...Light emitting diode for operation monitoring, [71, (/7), Φ light 7 eyeper, (a'
l・Photodiode for hall light, (ri) War・Timer, (/
17A)・φ judger, (//)・cutoff command switch,
(/λ)・φ auxiliary switch, (/3)・control wt source,
(/j)・Light-emitting diode for fist disconnection detection, (/6)@・
It is suppressed resistance. Note that the same reference numerals in each figure indicate the same or corresponding parts. Atsushi 1 figure 2 figures (d) Rokuse 5v Shiba

Claims (1)

[Claims] An operation command including a control power supply and an electric device connected between both ends of the control power supply, which operates when an operation command is given, conducts current from the control power supply, and cuts off the current upon completion of the operation. a circuit, a circuit connected to the cutoff command circuit to monitor whether its operation is normal or abnormal, and a circuit connected in series between the positive terminal side of the control power source and the positive terminal side of the electrical equipment to prevent disconnection of the electrical equipment. A light emitting diode for detection, a suppression resistor for suppressing the current, and an optical fiber for transmitting light output from the light emitting diode to the operation monitoring circuit, and monitoring lighting of the light emitting diode during normal times. An electrical equipment operation monitoring device characterized in that a disconnection of the electrical equipment is detected by: