JPH08130826A - Connector - Google Patents

Abstract

PURPOSE: To prevent the tripping of a circuit breaker by cutting off a second plug socket connected with a load having lower priority order by means of an electromagnetic contactor when the sum of load currents which are the outputs of first and second current transformers exceeds a prescribed value which is smaller than the preset tripping value of a circuit breaker. CONSTITUTION: When a microwave oven 4 connected to a plug socket 2 has a higher priority order than a hot carpet 5 connected to another plug socket 3 has, the tripping of the power supplyside circuit breaker l of the plug sockets 2 and 3 can be prevented by temporarily cutting off the carpet 5 having lower priority order even when the oven 4 and carpet 5 are simultaneously used in excess of the capacity of the breaker l. In other words, the priority order of a plurality of loads connected to a plurality of plug sockets is decided and, when the sum of the load capacities of the loads reaches a value preset in the RAM 8b of a controller 8, the load having lower priority order is disconnected from the power supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector such as an outlet or a table tap for connecting a power source load.

[0002]

2. Description of the Related Art Conventionally, when a plurality of high load capacities are connected to an outlet having a certain limit value and the total value of the capacities exceeds a certain limit value of the outlet, the breaker of the outlet trips. It took a lot of time to restore it.

A conventional connector will be described with reference to FIG. FIG. 4 is a diagram showing a configuration of a peripheral circuit of a conventional outlet.

In FIG. 4, 1 is a breaker installed on the power source side of a plurality of outlets (described later), 2 and 3 are outlets to which a power source load (described later) is connected, and 4 and 5 are power source loads.

The breaker 1 has a capacity of 30 A, and the power supply loads 4 and 5 connected to the outlets 2 and 3 have rated values of 20 each.
In the case of A, when the power supply loads 4 and 5 are operating at 50% of the rated value, the total load capacity is 20 A, which is less than the capacity of the breaker 1 and there is no problem.

However, when the power supply loads 4 and 5 operate at 100% of the rated value, the total load capacity becomes 40 A, which exceeds the capacity of the breaker 1 of 30 A.
Will trip.

In an example of a general household, a contract breaker with an electric power company trips when a "microwave oven" and a "hot carpet", which are high load capacity devices, are used at a rated value at the same time.

[0008]

In the conventional connector as described above, the breaker 1 trips when the total value of the load capacities exceeds the capacity of the breaker 1. Therefore, the trip may be manually restored or the power supply may vary depending on the power load. There is a problem that it takes time and effort to set the time of the synchronization timer.

The present invention has been made to solve the above-mentioned problems, and when a plurality of high load capacities are connected to an outlet having a certain limit value, the total value of the plurality of high load capacities is The purpose of the present invention is to obtain a connector in which the breaker of the outlet does not trip even if it exceeds a certain limit value, and it does not take time and effort to restore.

[0010]

A connector according to the present invention comprises a first current transformer for detecting a load current flowing through a breaker to a first outlet to which a load having a high priority is connected, and the breaker. Through the second current transformer for detecting the load current flowing through the second outlet to which the load of low priority is connected, and the total value of the load currents output from the first and second current transformers. And a control device for disconnecting the second outlet to which the low-priority load is connected by the electromagnetic contactor when the predetermined value smaller than the preset trip value of the breaker is exceeded.

Further, in the connector according to the present invention, the control device stores a load current value flowing through the second outlet at the time of disconnecting the load current value, which is an output of the first current transformer. When the sum of the stored load current value and the stored load current value is less than the predetermined value, the second outlet, to which the low-priority load is connected by the electromagnetic contactor, is connected to the power supply.

[0012]

In the connector according to the present invention, the first current transformer for detecting the load current flowing through the first outlet to which the load having the higher priority is connected through the breaker, and the priority order through the breaker. A second current transformer that detects a load current flowing through a second outlet to which a low load is connected, and the breaker in which the total value of the load currents that are the outputs of the first and second current transformers is preset. And a control device for disconnecting the second outlet to which the low-priority load is connected by a magnetic contactor when a predetermined value smaller than the trip value of is exceeded. It does not take time and effort.

In the connector according to the present invention,
The control device stores a load current value flowing through the second outlet at the time of the disconnection, and a total value of a load current value that is an output of the first current transformer and the stored load current value is the above-mentioned value. When the value falls below a predetermined value, the second outlet to which the low-priority load is connected is connected to the power source by the electromagnetic contactor, thus preventing the breaker from tripping,
It does not take time to restore.

[0014]

【Example】

Example 1. An embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. 1 is a diagram showing the overall configuration of a first embodiment of the present invention. FIG. 2 is a diagram showing the configuration of the control device according to the first embodiment of the present invention. Further, FIG. 3 is a flowchart showing the operation of the first embodiment of the present invention. In each figure, the same reference numerals indicate the same or corresponding parts.

In FIG. 1 and FIG. 2, the breaker 1 to the power source load 5 are the same as those in the conventional example, and the description thereof will be omitted. 6 is a current transformer that detects the load current of the power source load 4 connected to the outlet 2, 7 is a current transformer that detects the load current of the power source load 5 that is connected to the outlet 3, and 8 is a current transformer 6 and a transformer. It is a control device having a program and the like that outputs a cutoff to the electromagnetic contactor 9 when the total value of the respective load currents detected by the sink 7 exceeds a preset value.

In addition, in FIG.
O port 8a, RAM 8b, CPU 8c, and ROM
And a computer 8e provided with 8d. The power load 4 connected to the outlet 2
Has a higher priority than the power supply load 5 connected to the outlet 3 (the power supply load 4 is not allowed to be cut off)
I shall.

Here, the power supply loads 4 and 5 will be described as "microwave oven" and "hot carpet", respectively, using a general household as an example. That is, in step 101, the CPU 8c of the control device 8 proceeds to step 102 when the total value of the load currents detected by the current transformers 6 and 7 exceeds the numerical value preset in the RAM 8b.

Next, in step 102, the "hot carpet" is disconnected from the power source by the electromagnetic contactor 9, and the process proceeds to step 103. Next, in step 103, the load current value of the "hot carpet" at the time of disconnection from the power source in step 102 is stored in the RAM 8b.

Next, in step 105, the current transformer 6
The total value of the load current detected in step S1 and the load current of the current transformer 7 at the time of disconnection stored in step 103 is R in advance.
If it is less than the value set in AM8b, the process proceeds to step 106. Next, in step 106, the "hot carpet" is returned to power by the electromagnetic contactor 9.

Note that step 104 and step 107
Indicates that the total value of the load currents detected by the current transformers 6 and 7 is R
The electromagnetic contactor 9 when it is close to the value set in AM8b
Is a timer for a certain period of time to prevent it from operating repeatedly.

According to the first embodiment, the outlets 2 and 3
Even if both the "microwave oven" and the "hot carpet", which are power loads exceeding the capacity of the breaker 1 on the power source side, are used at the same time, the breaker 1 is temporarily cut off by cutting off the "hot carpet" having a lower priority. Can prevent the trip.

That is, in the first embodiment, a plurality of loads connected to a plurality of outlets are prioritized, and the total value of the load capacities is set in advance in the RAM 8b of the control device 8 (from the trip value of the breaker). When the value reaches a small value), the low-priority load is disconnected from the power source by the electromagnetic contactor 9, so that the breaker 1 of the outlet can be prevented from tripping and no trouble such as restoration is required.

[0023]

As described above, the connector according to the present invention includes a first current transformer for detecting a load current flowing through a breaker to a first outlet to which a load having a high priority is connected, and A second current transformer that detects a load current flowing through a breaker to a second outlet to which a low-priority load is connected, and a total value of load currents that are the outputs of the first and second current transformers. When a predetermined value smaller than the trip value of the breaker set in advance is exceeded, the load having the lower priority is connected by the electromagnetic contactor.
Since it is equipped with a control device that disconnects the outlet, the circuit breaker is prevented from tripping, and there is no need for restoration work.

Further, in the connector according to the present invention, as described above, the control device stores the load current value flowing in the second outlet at the time of the disconnection, and the output of the first current transformer. When the total value of the load current value and the stored load current value is less than the predetermined value, the second outlet to which the low-priority load is connected is connected to the power source by the electromagnetic contactor. This prevents the breaker from tripping and saves time for restoration.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a control device according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 4 is a diagram showing an overall configuration of a conventional connector.

[Explanation of symbols]

1 breaker, 2 outlets, 3 outlets, 4
Power load, 5 power load, 6 current transformer, 7 current transformer, 8
Control device, 9 electromagnetic contactor.

Claims (2)

[Claims] 1. A first current transformer that detects a load current flowing through a first outlet to which a load with a high priority is connected through a breaker, and a load with a low priority is connected through a breaker. A second current transformer that detects a load current flowing through the outlet of the power supply, and a predetermined value that is smaller than a preset trip value of the breaker, which is a total value of load currents output from the first and second current transformers. A connector comprising a control device for disconnecting the second outlet to which the low-priority load is connected by an electromagnetic contactor when the number exceeds the maximum. 2. The control device stores a load current value flowing through the second outlet at the time of disconnecting the load current value, which is an output of the first current transformer, and the stored load current value. 2. The connector according to claim 1, wherein the second outlet, to which the low-priority load is connected by the electromagnetic contactor, is connected to a power source when the total value of the above is less than the predetermined value.