JPH0150295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing concentration of short-term loads that occur stochastically.

Conventionally, this type of load concentration prevention device has not been used.

For this reason, since the capacity of the power supply equipment was determined assuming the worst case condition, there was a drawback that the capacity of the power supply equipment was extremely large compared to the average load state. In addition, if the capacity of the power supply equipment is not increased, there is a drawback that when loads are probabilistically concentrated, sufficient power is not supplied to each load and the loads do not operate satisfactorily.

This invention was made in order to solve these drawbacks, and provides a load concentration prevention device that prevents the occurrence of a load state exceeding the capacity of the power supply equipment, even if the capacity is not so large compared to the average load state. It is intended to.

Next, one embodiment of the present invention will be explained with reference to FIG. In Fig. 1, the three-phase short-term load concentration prevention device 1 includes the connected phase and load size for each load.
A storage unit 2 that stores the time length of the load and the limited capacity of the power supply, etc., an energization status monitoring unit 3 that monitors the energization status of each load, and an energization status monitoring unit that monitors the energization status when a energization request is made to a certain load. 3, and an energization command section 4 that determines and stores the energization start timing for the load for which the energization request has been made based on information managed by the storage section 2, and issues an energization command for a predetermined length from the determined timing. be done.

On the other hand, each phase of the three-phase power supply 11 has a plurality of single-phase loads 12a, 12b, . . . 13a, 13b, .
4a, 14b, . . . are connected. Each load has remote control switches 15a, 15b,...16a, 16b, which are opened and closed by the energization command signal from the energization command section 4.
...17a, 17b, ... are connected in series.

Further, the energization request signal for each load is configured to be transmitted from the energization request signal transmitter 18 to the energization command unit 4 of the three-phase short-term load concentration prevention device 1.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be explained. For example, when an energization request for the load 12a occurs, an energization request signal for the load 12a is transmitted from the energization request signal transmitter 18 to the energization command section 4 of the three-phase short-term load concentration prevention device 1. The energization command section 4 first checks the connected phase of the load 12a based on the information stored in the storage section 2, and then checks the connection state of the loads of the same phase and other phases, which is grasped by the energization state monitoring section 3. Based on the size of the load 12a and the limited capacity of the power supply stored in the storage unit 2, it is determined whether the load 12a is energized or not, taking into consideration the interphase balance. If possible, immediately send an energization command signal to the remote control switch 15a, and continue to issue the energization command signal for the length of time of the load. Furthermore, when issuing an energization command signal, the energization state monitoring section 3 is informed of which load has started to be energized. As a result of this operation, the load 12a begins to be energized, and the energization is ensured for the necessary length of time, and the energization state monitoring unit 3 recognizes that the load 12a has started to be energized.

Once the required load time length has elapsed,
The energization command unit 4 cuts off the energization command signal to the load 12a, and the energization to the load 12a is stopped. At this time, the energization state monitoring section 3 is informed that the energization has been stopped, and the energization state monitoring section 3 recognizes that the energization of the load 12a has been stopped.

If it is determined that the load 12a cannot be energized due to its capacity, the timing to start energizing the load 12a is determined based on the information of the load that has already requested energization, and is stored in the energization command unit 4. put. Then, when the timing to start energization comes, the procedure for starting energization is taken in the same manner as described above.

In the above embodiment, a case has been described in which the energization state monitoring section 3 recognizes the energization state of each load based on information from the energization command section 4, but the energization state monitoring section 3 may recognize the energization state by receiving an energization state signal from each load.

As described above, according to the present invention, the energization timing is controlled so as not to exceed the limited capacity of the power supply in response to the load energization request that occurs stochastically.
The power supply equipment capacity does not need to be extremely large compared to the average load condition as in the past, and has the effect of being smaller than the conventional equipment capacity.

[Brief explanation of drawings]

The figure is a block circuit diagram showing the relationship between a three-phase short-term load concentration prevention device and a load according to an embodiment of the present invention. 1... Three-phase short-term load concentration prevention device, 2...
Storage unit, 3... Energization state monitoring unit, 4... Energization command unit, 11... Three-phase power supply, 12a, 12b... First
Single-phase load connected to the phase, 13a, 13b...load connected to the second phase, 14a, 14b...the third phase
Single-phase loads connected to the phases, 15a, 15b, 16
a, 16b, 17a, 17b... Remote control switch, 18... Energization request signal transmitter.

Claims (1)

[Claims] 1. In a system where multiple single-phase short-time loads are repeatedly connected to each phase in random order to a three-phase power supply, the connected phase, load size, load time length, and power source limitations for each load A storage unit that stores the capacity, an energization status monitoring unit that monitors the energization status of each load, and a energization status monitoring unit that monitors the energization status of each load. an energization command unit that determines and stores the energization start timing for the load that has been set, and issues an energization command for a predetermined length from the determined timing;
A three-phase short-time load concentration prevention device characterized by controlling energization so that the total load does not exceed a predetermined limited capacity of a power supply in response to energization requests that occur stochastically.