JPH0199444A - Power source distributor - Google Patents

Abstract

PURPOSE:To miniaturize a device and shorten a time required for making a power source, by connecting a rush current detector for detecting rush current and discriminating that the total current value of loads does not exceed a set value, to a power bus line common to the respective loads, and by inlining the output state of the detector as the progressive condition of working for making breaker sequence. CONSTITUTION:When the time change rate of input current comes to a constant value or more, then by a rush current detector 3, it is discriminated that the value shows rush current, and output contact is closed, and when In=0 at a time tn, then it is discriminated that a rush current period lapses. Besides, the load current of respective loads 71-7N is added in total to be stored, and when it is discriminated that its value is a set value computed previously from the current capacity of an uninterruptible power source 1, or less, then the output contact is opened. Then, by the rush current detector 3, the energizing timing of a breaker to be made at a following step is determined, and working for the sequence making of the whole breakers 61-6N proceeds.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply distribution device that connects a plurality of loads, such as computers and 70-segment equipment, to a power source in a predetermined order.

[Prior Art J] Fig. 4 is a load system diagram corresponding to the internal load system diagram of a thermal power plant shown in, for example, Jikai No. 11i352-8445. In the figure, 1 is an uninterruptible power supply, 4 is a voltage detector, 5 is a power bus, 61 to 6N are circuit breakers, 71
~7N is the load and these circuit breakers are uninterruptible power #
In order to make the power supply capacity of 1 economical, the power supply is turned on in a predetermined order by a sequential turn-on control circuit as shown in FIG.

In FIG. 5, 11 and 12 are control lines, 4-a is an output contact of the voltage detector 4, 61T to 6N'I' are timers, and 61
T-a ~ 6 N T-a is timer contact, 61X
~6NX is an auxiliary relay, 61X-a ~ 6NX-a is a contact of the auxiliary relay, 61Y ~ 6NY is a breaker operating coil, 61 Y-am ~ 6 NY-am is a self-sustaining contact of the operating coil, 61 Y-a n~6NY
-an, 62Y-b to 6NY-b are auxiliary contacts of the circuit breaker.

In this configuration, when voltage is applied to the power supply bus 5 from the uninterruptible power supply 1, the voltage detector 4 is activated and its output contact 4-a is closed, so that the normally closed circuit is opened when the circuit breaker 62 is turned on. The timer 61T is energized through the auxiliary contact 62Y-b and the output contact 4-a, and after a certain period of time (timer setting value), the timer contact 61T-a is idle, and the auxiliary relay 61X is activated.
is energized. The relay contact 61X-a closes due to the energization of the auxiliary relay 61X, and the operating coil 61Y of the breaker 61 closes.
is energized, and the self-holding contact 61Y-am closes. The breaker 61 is turned on by the activation of the operating coil iL/61Y, and power is supplied to the load 71. When the circuit breaker 61 is turned on, the auxiliary contact 61Y-an is closed and the next stage timer 62T is energized. When the timer setting time has elapsed, the PC timer contact 62T-Xa is closed in the same way as above, and the operating coil/ I/
62Y is energized, the circuit breaker 62 is closed, and the load 72 is turned on.
Power supply starts. Thereafter, the circuit breakers 63 to 6N are turned on through the same procedure, and the entire load 71 to 7N is supplied with power from the uninterruptible power supply l.

FIG. 6 shows the current waveform flowing out from the uninterruptible power supply l when the above order is turned on, where 11 is the inrush current of the load 71, I
Is is the rated current of the load 71, 12 is the rush current of the load 72, L2s is the rated current of the load 72, 13 is the rush current of the load 73, 13s is the rated current of the load 73, T1. T2 and T
3 is the setting value of the timers 61T, 162T and 63T, respectively, and is set to the value of the time tζ plus the extra time until the current of the loads 71, 72 and 73 settles to the rated value after the breaker is turned on.

[Problems to be Solved by the Invention] By the way, the magnitude of the above rush currents 11, 12, 13... differs depending on the type of load, and the rated values 11s, 12a...
, 13s..., so the time required to turn on the next stage breaker is T1%T2, T3...,
That is, since it is necessary to provide as many timers as the number of loads that provide step-up conditions, the order input control circuit becomes large in size with high 1, and there is the trouble of having to set the timer setting value for each load. The timer setting value has a certain degree of margin in consideration of voltage fluctuations, etc., so it takes too long to complete the closing of all circuit breakers, and the current value of each load circuit There was a problem in that if the prediction was incorrect, the uninterruptible power supply would trip during the sequence input.

This invention was made in order to solve the above-mentioned conventional problems, and compared to the conventional one, the device can be made smaller and more economical, and the time required to turn on the full load is shortened. The purpose is to obtain a power distribution device that can

[Means for Solving the Problems] In order to achieve the above-mentioned objects, this invention has the purpose of making the inrush current period abrupt in the power supply bus common to each load, and making sure that the total current value of the loads is less than the current capacity of the uninterruptible power supply. An inrush current detector is connected to determine whether the calculated and set value does not exceed the set value, and the output state of the inrush current detector is incorporated as a step condition for the circuit breaker sequential closing operation.

[Operation J] In this invention, when the current period of the rush current due to the closing of the breaker has elapsed, the energizing circuit of the next stage breaker is closed.

〔Example〕

FIG. 1 is a diagram of an in-station load system in which the present invention is implemented, and FIG. 2 is a circuit diagram of a sequence input control circuit. In both figures, 2 is a current transformer, and the sum of the currents L1, 12, 13, and so on flowing through the loads 71, 72, 73, and so on, respectively, is l=Σ1n.
to come forward. 3 is an inrush current detector, into which the secondary output of the current transformer 2 is input.

3T is a timer, and is used to set some margin time.

This inrush current detector 3 detects an inrush current when the 10-hour change rate of the input current, that is, the input current waveform as shown in FIG. The judgment is made and the output contact 3-a is closed, and when ∆ln=0 after ∆t time, it is judged that the inrush current period has elapsed, and the total load current of each load is added and memorized, and the value is stored in advance as an uninterruptible power supply. If it is determined that the current capacity is less than the set value calculated from the current capacity, output contact 3
-a opens the circuit. Reference numeral 13 denotes a self-holding control line, to which self-holding contacts 61 Y-am to 6 N Y-am are connected. The other configurations are the same as the conventional ones shown in FIGS. 4 and 5, and therefore are indicated by the same reference numerals.

Next, the operation of the order input control circuit shown in FIG. 2 will be explained.

When voltage is applied from the uninterruptible power supply 1 to the power supply bus 5, the voltage regulator 4 is activated and its output contact 4-a is closed, and the output contact 4-a, the timer contact 3T-b of the timer 3T, The operating coil 61Y is energized through the normally closed auxiliary contact 62Y-b, and the self-holding contact 61Y-am is closed. Working carp/
The breaker 61 is turned on by the energization of L/61Y, power supply to the load 71 is started, and at the same time, current flows into the inrush current detector 3 via the current transformer 2. The inrush current detector 3 closes the output contact 3-a when the inrush current 11 described above is detected or the total value of the load current is less than the set value calculated from the current capacity of the uninterruptible power supply. Closed, timer 3T is activated. Since the timer contact 3T-b is surrounded by the energization of the timer 3T, the energizing circuit of the operating coil/l/62 is not closed, and the current flowing through the load 71 has settled down to the rated value 118. When the rush current is detected by the inrush current detector 3, the output contact 3-a opens and the timer 3T is activated.
is deenergized, and after a certain period of time, timer contact 3T
-b is closed. As a result, the operating coil 62Y of the breaker 62 is energized, the breaker 62 is turned on, and power supply to the load 72 is started.

In this case, for example, if the load 71 is a type of load that does not take inrush current, the inrush current detector 3 will not operate.
When the breaker 61 is turned on, the auxiliary contact 61Y-arJ is closed, the operating coil /l/62Y is energized, and the breaker 62 is energized.
is injected.

In this way, the circuit breakers 61 to 6N are turned on in order,
Self-maintained. The power supply from the uninterruptible power supply is stopped,
When the power supply bus 5 becomes non-voltage, the control lines 11 and 12 are also made non-voltage, so the operating coil /L/61
Y to 6NY are deenergized and circuit breakers 61 to 6N are tripped.

In this embodiment, the inrush current detector 3 determines the energization timing of the circuit breaker to be closed at the next stage, and the sequential closing operation of all the circuit breakers 61 to 6N proceeds. Since this eliminates the need for the auxiliary relays 61X to 6NX, the configuration of the order input control circuit becomes simple and the cost of the device is greatly reduced.

Furthermore, since the closing operation of the next-stage breaker is performed after the inrush current period has elapsed, there is no risk of inrush current being superimposed. Furthermore, the uninterruptible power supply will not trip due to excess load current.

Note that the inrush current detector 3 operates by increasing the current change rate of the input current, but it is also possible to use a type that performs predictive calculation using a part of the input waveform using a computer or the like. It is not limited to those of.

Further, in the above embodiment, a case has been described in which the load is powered on using a breaker, but this may be a ground switch such as a no-fuse breaker or a contactor.

[Effects of the Invention] As explained above, this invention can advance the closing operation of all circuit breakers using a single inrush current detector, which eliminates the need for conventional circuit breakers that require as many timers as the number of loads. Compared to the previous model, it is possible to reduce the size and cost of the equipment, and it also has the advantage of eliminating the hassle of setting timers, and also reduces inrush current even when power supply voltage fluctuations occur. Since there is no need to take extra time as in the conventional case, the total closing time of all circuit breakers can be greatly reduced. Furthermore, it also has the effect of preventing the uninterruptible power supply from tripping due to excess load current.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing one embodiment of the present invention, Fig. 2 is a circuit diagram of an order-on control circuit that controls the circuit breaker of the Queen's embodiment, and Fig. 3 is the operation of the inrush current detector in the above embodiment. Figure 4 is a system diagram of a conventional power supply distribution device, Figure 5 is a sequential input control circuit for the above-mentioned example, and Figure 6 is the inrush current flowing to the power supply bus in the conventional example. FIG. In the figure, 2...Current transformer, 3...Inrush current detector, 3-a...Output contact, 3T...Timer, 3T-a
...Timer contact, 4...Voltage regulator, 4-a...
Output contact, 5... Power bus, 61-6 N - Breaker, 61Y-6NY... - Breaker operating coil fV, 71
~7N...Load. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a power distribution device in which a plurality of loads are connected to a common power supply bus through respective shunts and the power supply bus is pressurized, the closing operations of the shunts are stepped in accordance with a predetermined order. An inrush current detector is provided that outputs while the current period of the inrush current and the total of the current flowing into the load is less than a preset value, and the inrush current detector is not in operation or has completed operation as described above. A power supply distribution device characterized in that the sequential operation of disconnectors is set as a progressive condition.