JPH03250515A - Breaker operation discriminator - Google Patents

Abstract

PURPOSE:To prevent an accident of a breaker in advance by taking in breaker on-off signals, a trouble detection contact signal and such an external signal as the measured value of current consumption or the like, and then combining those informations with one another to judge/discriminate the operative contents of the breaker. CONSTITUTION:A mechanical judgment circuit 9 in an information judgment circuit 8 outputs a signal when the mechanical judgment circuit compares the number of times (No) that a breaker is actually used for operation with the predetermined specified number of times (NR<n>) that the breaker is used for operation to satisfy a condition of NR<n=No. An operating duty judgment circuit 10 outputs a signal when the result of a comparison between the predetermined operating duty (NRS) of the breaker at the time of short circuit and the number of times (NS) that the short circuit current breaker is actually closed satisfies a condition of NRS<=NS. An electrical judgment circuit 11 outputs a signal when the result of a comparison between the predetermined electrical specified number of times (NRI) that the breaker is operated (a current value x the number of operations of the breaker) and the electrical number of times (NI) that the breaker is actually operated satisfies a condition of NRI<=NI. For the purpose of beforehand preventing an accident in the breaker, an alarm is given when the number of times (I1.N1) that the breaker is actually used for operation is compared with a predetermined value (I.N) as the number of times that the breaker before the end of the life is used for operation to satisfy a condition of I.N>I1.N1.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a circuit breaker operation determination device.

(Prior art) Conventional circuit breaker operations have been equipped with a counter that counts only one mechanical count regardless of the operation content of the breaker, and other operation details are recorded by a separate means and the information is saved. 1 judgment is being made. However, among the operational details of a circuit breaker, not only the mechanical frequency is the most important, but also the electrical frequency, the number of short circuits, etc. that have a large impact on the life of the breaker. This is becoming important from the perspective of prevention.

(Problems to be Solved by the Invention) Therefore, the present invention classifies and distinguishes the various specified operations that the circuit breaker originally has, and also determines the lifespan from that information, and provides advance notice regarding the replacement of the device or the number of remaining times. The present invention attempts to provide a circuit breaker operation determination device that outputs information for issuing a warning.

[Structure of the invention]

(Means for Solving the It! Problem) The present invention provides an on/off contact that indicates the open/close state of a circuit breaker, a failure detection contact that operates depending on failure detection, and a current consumption that operates depending on the amount of current consumption. A measuring device, first and second AND circuits that combine the current usage measuring device, a failure detection contact, and an on/off contact, and an operation duty judgment device connected to the first AND circuit to determine operation duty. an electrical liability determination circuit connected to the second AND circuit to determine electrical liability; and an electrical liability determination circuit connected to the second AND circuit in parallel with the electrical liability determination circuit to issue an alarm, replacement, or notice. Alarm to judge,
This is a circuit breaker operation determination device comprising a replacement and advance notice determination circuit.

(Function) The present invention provides on/off signals of the circuit breaker, fault detection contact signals (
It takes in external signals such as measured values of current consumption (from devices equipped with a function to detect short circuits), and combines that information to determine and determine the operation of the circuit breaker.
Transmit each result to the outside.

In this way, equipment replacement or lifespan judgments have been made based only on mechanical frequency, but by making more advanced judgments, equipment lifespans can be determined in advance and accidents can be prevented.

(Example) Next, an example of the present invention will be described. Figure 1 shows an on/off contact 1 that indicates the open/close state of the breaker, a fault detection contact 2 that operates based on fault detection, a current usage measuring device 3 that operates depending on the amount of current used, and the amount of current used. An AND circuit 6.7 that combines the measuring instrument 3, the failure detection contact 2, and the ON/OFF contact 1; An electrical duty determination circuit 11 that determines electrical duty; and an alarm, replacement, or advance notice determination circuit 12.1 that is connected to the AND circuit 7 in parallel to the electrical duty determination circuit 11 and determines an alarm, replacement, or advance notice.
3.14 shows a circuit breaker operation determination device comprising the following.

In Figure 1, 1 is the breaker's disconnection point, 2 is the fault detection contact (equipped with a function for determining short circuits), and 3 is the device that sends the amount of current used to the breaker operation determination device. , 4 is an input device for taking in the above-mentioned information, and 6 is an input device for inputting the above-mentioned information, and 6 is a combination of the signals from the on/off contacts of the circuit breaker and the failure detection contact signal, and is sent to the operation duty judgment circuit 10 in the judgment device 8 based on an AND condition. 7 is for sending the signal from the breaker and the disconnection point and the amount of current used to the electrical frequency judgment circuit 11.This information is also used by the alarm judgment circuit 12 and the replacement judgment circuit. It is also used to send information to the circuit 13 and the advance notice judgment circuit 14.

Each judgment circuit in the information judgment device 8 will be explained below. The mechanical judgment circuit 9 compares the predetermined number of times NRn of the breaker with the actual number of times NO of use, and outputs an output when NR,≦NO. The operation duty judgment circuit 10 outputs an output when the predetermined operation duty NR5 of the breaker at the time of a short circuit and the actual short circuit current of the breaker and the number of times of closing NS become NR8'5NS.

The electrical judgment circuit 11 outputs an output when the predetermined electrical breaker electrical specified number of times (current value x number of times) NRI and actual electrical breaker number of times N x C current value x number of times) becomes NRI≦N. Ru.

Regarding the above, in order to prevent breaker accidents in advance, the value before the predetermined service life is
n) and the actual number of times of use I engineering・N1 (I.

N, = Σ” In 'Nn), I −N>I
□-N, the alarm continues to be issued to notify that the danger has exceeded the limit. Similarly, ・N1=I・N is a logic judgment circuit that indicates that it is time for replacement, and Iyo・N□< ・N is a logic judgment circuit that informs that it is time for replacement. 15 is an output device for transmitting the above information to the outside.

〔Effect of the invention〕

As described in detail above, according to the present invention, a higher level of judgment is made regarding the maintenance of circuit breakers, which was conventionally performed only by mechanical frequency, and prevents accidents caused by contact wear, etc., as well as appropriate maintenance. It is possible to provide a breaker operation determination device that can also be used to prevent accidents.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a breaker operation determination device showing an embodiment of the present invention, and FIG. 2 is a circuit explanatory diagram using FIG. 1. 1... Breaker on/off contact 2... Failure detection contact 3
... Current consumption measuring device 5 ... Synthesizer 8 ... Judgment device 10 ... Operation responsibility judgment circuit 12 ... Alarm judgment circuit 14 ... Advance notice judgment circuit 21 ... Transformer 23 ... Breaker on/off contact 25...failure detection contact 26...current usage measuring device 4...input device 6.7...AND circuit 9...mechanical judgment circuit 11...electricity target judgment circuit 13...replacement judgment circuit 15...output device 22...breaker 24...current transformer

Claims (1)

[Claims] An on/off contact that indicates the open/closed state of the circuit breaker, a failure detection contact that operates based on failure detection, a current consumption measuring device that operates depending on the amount of current used, and this current consumption measuring device and the above-mentioned. first and second AND circuits that combine the failure detection contact and the on/off contact; an operation duty determination circuit that is connected to the first AND circuit and determines the operation duty; and the second AND circuit. an electrical liability determination circuit connected to the electrical liability determination circuit for determining electrical liability; and an alarm, replacement, or advance notice determination circuit connected in parallel to the electrical liability determination circuit to the second AND circuit to determine an alarm, replacement, or advance notice. A circuit and a disconnection operation determination device.