JPH11143555A - Energy consumption reducible voltage controller of transformation facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power consumption reducible device capable of keeping voltage at constant voltage for reducing the energy consumption of a transformation facility by being inserted in series into a secondary line of a variable auto- transformer (choke transformer) of feedback control to drop secondary side voltage to about -10% voltage as a part of energy saving measures of a transformation facility. SOLUTION: For voltage adjustment at a transformation facility, a coil tap (tap of a voltage adjustment transformation coil) switches to specific voltage that is reference, further, a variable auto-transformer (choke transformer) of feedback control and an auto-transformer (choke transformer) are used as fine adjustment at the same time, a magnetic circuit core (movable core) is freely operated by rotational force of mechanical electronic control only by inserting them into a secondary line to generate the change action of reactance at both sides of a winding coil. If the voltage drop is adjusted and it is used as voltage adjustment, the voltage is easily finely adjusted and necessary voltage can freely be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed as a device in a substation facility, and as a part of energy saving measures, the secondary side voltage is controlled to a lower voltage of about -10% and automatically controlled. The purpose is to reduce power consumption and save power by maintaining a constant voltage.

[0002]

2. Description of the Related Art Conventionally, a private customer who requires power of 50 kW or more generally negotiates a contract power with a power company and sets a condition for payment of a power fee (basic fee). An extra charge was charged as a penalty for the excess power usage fee.

[0003] Therefore, each customer has come to install a demand control system as a power monitoring and control measure. The installation of the demand control system of FIG. 3 was divided into the following types. (Ratio control method) When the contracted power is exceeded, the circuit is immediately cut off according to a preset order, and the power is used so as to be less than the contracted power. (Ideal curve method) The power required by the consumer is set as an ideal curve, and the power load is adjusted and implemented along the curve. (Predictive control method) According to a change in power demand in a unit time, the final time is predicted and the increase / decrease of the load is adjusted while comparing with the contract power.

[0004] In addition, when the reactance load is large,
There was a phase delay of the current, the power factor became worse, wasteful power consumption (reactive power) increased, and efficiency decreased. These were used together with the capacitance to improve the power factor and compensate for waste.

[0005] In a small-scale device, a stable voltage is automatically generated even if there is a large change in the capacitance and the load using a transformer resonance circuit in an electronic circuit based on the electromagnetic theory of resonance. There was a device controlled and output.

[0006]

Problems to be Solved by the Invention When a constant voltage cannot be obtained by compensating for a change in voltage drop due to a change in power supply voltage or a change in load, or when a sudden increase in load results in an extremely fluctuating voltage, there is a demand. There is a case where it is desired to change the winding tap of the transformer according to the applied voltage. However, it is not easy because of the high voltage equipment. In addition, for large consumers of electricity, a blackout of power without power would hurt employment. Furthermore, transformer tap conversion in substation facilities is almost impossible. Control by automatic control is desirable. Even with the same automatic control, there are devices that have recently been described as being newly developed, but these are all devices that are merely applications of technological deformations in the past.

[0007]

[Means for Solving the Problems] It is a common practice that voltage adjustment in a substation facility is performed directly by artificial work by switching with a winding tap (tap of a voltage adjustment transformer coil) attached to a main transformer. Was. However, all of these devices have an irregular output voltage control by intermittent contacts by switches. In this case, good flat characteristics cannot be obtained. Although it is not easy to obtain the power supply voltage fluctuation and the voltage drop and fluctuation correction due to the load, it is necessary to insert a variable autotransformer (choke transformer) in series to the secondary side line in order to respond quickly to the load fluctuation. This is because goodness has been found.

[0008]

Next, a circuit configuration and a structure according to the present invention will be described. Voltage adjustment in the substation of FIG. 1 is switched to a reference arbitrary voltage by a winding tap (tap of a voltage adjustment transformer coil) of FIG. 2 attached to a main transformer, and further fine adjustment is performed as shown in FIG. Is inserted in series on the secondary line of the variable single-wound transformer (choke transformer). This variable single volume transformer (choke transformer)
As shown in the figure, the structure of the winding coil is almost similar to the structure of the transformer for electric welder, and the magnetic circuit core (movable iron piece)
Has a structure that can be freely changed by the operating torque of mechanical electric control (according to a well-known concept in the art). This operation is adjusted by using a voltage drop generated at both ends of the winding coil due to the change of the reactance, and since it is used as a voltage adjustment, fine adjustment can be easily performed and an effect is produced.

[0009] Furthermore, in large-scale substation equipment, the power also increases, and the structure of the variable autotransformer (choke transformer) shown in FIG. 4 becomes large-scale, so that the structure of the magnetic circuit core (movable iron piece) becomes very large. The installation location naturally becomes large. In such a case, the equipment cost and the equipment are reduced by using not a variable single-winding transformer (choke transformer) as shown in FIG. The size is reduced and the cost can be reduced.

[00010]

According to the present invention, the operation of a variable auto-transformer (choke transformer) automatically controlled by feedback makes the voltage stability with respect to the power load to be perfect, and the stable variable voltage control which does not allow other products to follow. Device.
In addition, a flat characteristic with a small change rate is exhibited.

[Brief description of the drawings]

FIG. 1 is an overall view of a substation facility.

FIG. 2 is a tap diagram of a voltage adjusting transformer and a coil.

FIG. 3 is a diagram of a demand control system.

FIG. 4 Variable single-wound transformer (choke transformer)

FIG. 5 is a circuit diagram showing the arrangement of a variable single-turn transformer and a single-turn transformer.

Claims (2)

[Claims] 1. As a part of energy saving measures, a variable single-turn transformer (choke transformer) for feedback control is inserted in series to a secondary line in order to reduce the secondary voltage to a voltage of about -10%. A power saving device characterized by being controlled to a lower arbitrary voltage and automatically maintaining a constant voltage. 2. A variable single-wound transformer (choke transformer) and a semi-fixed single-wound transformer (tapped choke transformer) for feedback control are used in combination with a secondary circuit.
The power saving device according to claim 1, wherein the combination is a series-inserted combination.