JPH0716547U - Shut-off device with shut-off warning indicator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a circuit breaker with a circuit break warning indicator that allows the user to know in advance that the breaker will fall. [Structure] When the load current is detected by the current transformer 4 and the value of this load current exceeds 150% of the preset rating, or when it exceeds 125% of the rating and exceeds 5 minutes, a warning state is given. The detection unit 9 sounds the buzzer 10 and the indicator lamp 1
Flashes 1 to alert you to the interruption and call attention. In addition to the current value, the advance warning state may be detected by the temperature of the bimetal of the delay tripping mechanism of the breaking unit, the movement of the piston of the oil dashpot, or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a circuit breaker such as a circuit breaker and a current limiter provided in indoor wiring.

[0002]

[Prior art]

 Conventionally, in order to prevent unexpected accidents in the indoor wiring or electrical equipment connected to the indoor wiring due to overcurrent, a wiring breaker and a current limiter (hereinafter collectively referred to as "breakers") ) Is provided. In addition to preventing this accident, the current limiter has the purpose of fulfilling the contract conditions with the power company or the owner of the building.

The delay tripping mechanism of the breaker includes a thermal type using a bimetal and an electromagnetic type using an electromagnet and an oil dashpot, and has a tripping characteristic at an anti-time limit in which the operating time becomes shorter as the electric current increases. is doing.

As the delay trip characteristic, for example, a wiring breaker having a rated current of 30 A or less does not trip even if 100% of the rated current is continuously energized, and within 200 minutes at 200%. It is stipulated that the tripping operation should be carried out with and that the tripping operation should be carried out within 60 minutes at 125%.

[0005]

[Problems to be solved by the device]

 Since the breaker has the delay tripping characteristic as described above, it does not always shut off immediately even when the power is used in excess of the rated current. There is a feeling that

By the way, there are many household electric appliances that set a clock and a timer, such as a VCR, and it is troublesome to set them again when the breaker falls. Especially in the case of personal computers and word processors, there is a possibility that all data being worked will be lost or the hard disk will be damaged when a power outage occurs, resulting in fatal damage.

The present invention has been made to cope with such a situation, and an object of the present invention is to provide a circuit breaker with a circuit break warning indicator that allows the breaker to be known in advance.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, the breaker is provided with a break notice indicator, and more specifically, the breaker is constructed as shown in (1), (2) and (3) below. .

(1) Current detection means for detecting a current to be interrupted and a notice for detecting that the state of the current detected by the current detection means exceeds a predetermined current-time product value and / or current value A circuit breaker with a circuit break warning indicator equipped with a state detection means and a display means for displaying the output of the warning state detection means.

(2) Means for obtaining the minimum value of the current to be interrupted immediately before interruption, storage means for storing the minimum value obtained by this means, and the value of the current to be interrupted are stored in the storage means. A breaking device with a breaking warning indicator provided with a warning condition detecting means for detecting that the minimum value is exceeded and a display means for displaying the output of the warning state detecting means.

(3) An advance notice state detecting means for detecting that the state of the delay tripping mechanism in the breaking mechanism of the device exceeds a predetermined state, and a display means for displaying an output of the advance notice state detecting means. A circuit breaker equipped with a circuit break warning display.

[0012]

[Action]

 According to each of the configurations (1), (2), and (3), when each state in which there is a high possibility of interruption is detected by the advance notice state detection means, a display is made to call attention.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to examples.

First Embodiment FIG. 1 is a configuration diagram of a “breaker device with a notice of interruption display” according to a first embodiment. FIG. 2 is a flowchart showing the operation of this embodiment.

In FIG. 1, 1a and 1b are indoor wiring, 2 is a contact point, 3 is a trip coil for opening the contact point 2, and 2 and 3 constitute an electromagnetic shutoff mechanism together with an oil dashpot (not shown). ing. Reference numeral 4a denotes a magnetic core of a current transformer (hereinafter referred to as CT) 4 through which the wiring 1b penetrates as a primary winding, and reference numeral 5 denotes a secondary winding wound around the magnetic core 4a. Reference numeral 6 is a load resistance of CT4, 7 is a resistance, and 8 is a capacitor. These 7 and 8 form a low-pass filter. Reference numeral 9 is a prediction state detection unit that inputs the voltage of the capacitor 8 and detects that the circuit breaker is in the circuit break warning state, and operates the buzzer 10 and the indicator lamp 11.

Various devices such as a lighting device, an air conditioner, an AV device, and a copying machine are usually connected to the distribution line, and incandescent lamps, fixing heaters, motors, and the like in them are several cycles when they are turned on. During this period, a rush current of about 10 times the steady current flows. The low-pass filter composed of the elements 7 and 8 prevents the detection of the advance warning condition from being mistaken by this inrush current.

The operation will be described below with reference to FIG. In advance, a manual setting value Ia is set to an appropriate value larger than Ib by a knob (not shown) provided in the advance notice state detecting section. Here, the value of Ib stored in the memory of the detection unit 9 is 125% of the rated current and the value of Ia is 150%, and the time until the time-out stored in the memory of the detection unit 9 is 5 minutes, The rated current is 20A.

By CT4, a voltage proportional to the current of the indoor wiring 1b is obtained across the load resistor 6. This voltage is input to the advance notice state detection unit 9 via the elements 7 and 8 forming the low pass filter. The current value corresponding to this input is A. In the detection unit 9, the operation of FIG. 2 is performed by a CPU (not shown).

In step 1, it is judged whether or not the current value A of the indoor wiring 1b exceeds 150% of the rated current Ia, and if it exceeds (assuming that it is in the advance notice state), the process moves to step 7 and the buzzer 10 immediately. Is sounded and the indicator lamp 11 is blinked to call attention.

If the current value A does not exceed the 150% value in step 1, the process proceeds to step 2 and it is determined whether the current value exceeds the 125% value Ib. If it exceeds, it moves to step 3 to judge whether the timer is operating. In this case, if NO, it moves to step 4 to start the timer and returns to step 1. If the current value A does not exceed the 150% value Ia in step 1 and the current value A exceeds the 125% value Ib in step 2, the process proceeds to step 3. Since the timer is operating this time, move to step 6 and determine whether the timer has exceeded the set value of 5 minutes. Since it has not reached 5 minutes this time, return to step 1. If the current value A 1 exceeds 125% and does not exceed 150%, the operations of S1, S2, S3 and S6 described above are repeated. If this state exceeds 5 minutes, S6 becomes YES (assuming the state is in advance) and the buzzer sounds, the indicator lamp 11 is lit, and the attention is called.

When the sound of the buzzer 10 or the light of the indicator light is noticed, the power switch of the less important device is turned off, or the operation of the device is changed, the current value A becomes 125% or less, If step 2 is NO, the process proceeds to step 5, the timer is reset, and the process returns to step 1.

As described above, when the current of the indoor wiring, that is, the load current exceeds 30 A, which is 150% of the rated value, the buzzer 10 is sounded immediately and the indicator lamp 11 blinks to give a notice of interruption. Similarly, when the rated current exceeds 125% and 150% or less, that is, the condition of 25 to 30 A continues for 5 minutes or more, the same warning is given. If the manually set value Ia is made smaller, the safety level is increased, but since the frequency of advance notice is increased and it is troublesome, Ia may be set to an appropriate value in consideration of this point.

Second Embodiment In the first embodiment, the current value at the time of advance notice is manually set, but in the present embodiment, the minimum value of the current values immediately before interruption is set as the current value at the time of advance notice. is there.

The overall configuration of this embodiment is the same as that of FIG. 1, but the operation of the advance notice state detection unit 9 is as shown in the flowchart of FIG.

When the current value A to be interrupted is equal to or more than the content of the memory M2 (described later) in step 11, the process moves to step 16, the buzzer 10 is immediately sounded, the indicator lamp 11 is blinked to call attention.

If the current value A is not equal to or more than the contents of the memory M2 in step 11, the process proceeds to step 12, the current value is stored in the memory M1, and the process proceeds to step 13. It is judged in step 13 whether or not the interruption is performed. If it is judged that the interruption is not performed, the procedure returns to step 1. If it is determined that the operation is being performed, the process proceeds to step 14, and it is determined whether or not the content of the memory M1 is smaller than the content of the memory M2. If it is determined that it is not, the operation is stopped as it is. If it is judged to be small, the routine proceeds to step 15, where the contents of the memory M1 are overwritten in the memory M2 and the operation is stopped. In this way, the minimum value of the current value A just before the interruption in the past is always stored in the memory M2. A value such as 150% of the rating is set as the initial value in memory M2.

According to this embodiment, it is possible to set the current value at the time of advance notice that is suitable for the usage situation.

(Other Embodiments) Unlike a general circuit breaker, the breaker does not guarantee a rated short-time current, and it is difficult to accurately predict the breaking by a current value or a current-time product.

Therefore, it is possible to detect the advance notice state by the state of the delay tripping mechanism of the breaker to give the advance notice of the interruption.

As described above, the delayed tripping mechanism of the breaker includes a thermal type and an electromagnet. In the thermal type, a thermistor or the like detects when the temperature of the bimetal exceeds a predetermined value, and notifies the interruption. In addition, the electromagnetic type is configured to detect when the movement of the piston of the oil dashpot exceeds a specified value with a reed relay, etc., and give a notice of interruption.

In each of the above embodiments, the buzzer and the indicator lamp are used as the indicator, but the present invention is not limited to this, and, for example, a form using mechanical vibration or flash light for display is used. Can also be carried out.

[0032]

[Effect of device]

 As described above, according to the present invention, it is possible to know in advance that the breaker will fall by detecting the state in which there is a high possibility of interruption, that is, the notice state, and displaying the notice of interruption.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a flowchart showing the operation of the first embodiment.

FIG. 3 is a flowchart showing the operation of the second embodiment.

[Explanation of symbols]

 4 Current transformer 9 Warning status detector 10 Buzzer 11 Indicator light

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Toshimasa Ito 1-13-8 Kamikizaki, Urawa-shi, Saitama Nihon Signal Co., Ltd. Yono Works

Claims (3)

[Scope of utility model registration request] 1. A current detection means for detecting a current to be interrupted, and a notice state detection for detecting that the state of the current detected by the current detection means exceeds a predetermined current-time product value and / or current value. A circuit breaker with a circuit break warning indicator, characterized in that the circuit breaker is provided with means and display means for displaying the output of the warning state detection means. 2. A means for obtaining the minimum value of the current to be interrupted immediately before the interruption, a storage means for storing the minimum value obtained by this means, and a minimum for which the value of the current to be interrupted is stored in the storage means. A breaking device with a breaking warning indicator, comprising: a warning condition detecting means for detecting that the value is exceeded, and a display means for displaying an output of the warning condition detecting means. 3. An alerting state detecting means for detecting that the state of the delay tripping mechanism in the shutoff mechanism of the device exceeds a predetermined state, and a displaying means for displaying an output of the alerting state detecting means. A circuit breaker with a circuit break warning indicator.