KR20070029548A - The automatic voltage regulator of electric power curtailment that use voltage variableness radical - Google Patents

Abstract

An automatic voltage regulator using a transformer is provided to reduce power loss of an electronic device, such as a power apparatus, by outputting balanced output voltages to respective phases of a load. A proportional voltage winding is parallel-coupled with a main winding of a main transformer. An excitation winding of the main transformer is connected to the proportional voltage winding. A microcomputer detects a control amount, which is supplied from input/output voltage sensors, and automatically controls a target value according to external setting values for every group. The microcomputer is mounted on a PCB(Printed Circuit Board). A stepping motor switches between up-conversion and down-conversion modes based on a detected value from the microcomputer. When an imbalanced voltage is supplied to a source side, the PCB control substrate receives a voltage signal, and controls the proportional voltage of the proportional voltage winding, so that the load voltages are balanced.

Description

 The automatic voltage regulator of electric power curtailment that use voltage variableness radical}

         1 is a circuit diagram of an automatic voltage regulator for a power saver using a voltage converter to which the technique of the present invention is applied.

         2 is a partial circuit diagram of FIG.

■ Explanation of symbols used in important part of drawing ■

         L1: Sovereignty of A phase peripheral pressure

         L2: Female winding of A-phase peripheral pressure

         L3: A-phase voltage transformer proportional voltage winding

         L4: Sovereignty of phase B peripheral pressure

         L5: Female winding of B-phase peripheral pressure

         L6: B-phase voltage transformer proportional voltage winding

         L7: Sovereignty of C-phase peripheral pressure

         L8: Excitation winding of C-phase peripheral pressure

         L9: C-phase voltage transformer proportional voltage winding

        PCB: A device that controls the voltage variable proportional winding by operating the stepping motor by drawing the voltage current of each phase

       The present invention relates to an automatic voltage regulator, and more specifically, overvoltage, low voltage, and unbalanced voltages applied to general and industrial supply power are proportional to the voltage transformer proportional winding and the PCB is stepping motor proportional to the excitation winding of each phase. By supplying the voltage to the output voltage of each phase, the target value is set in the proper environment of the customer, and the target value is kept constant so that unnecessary power consumption is eliminated during overvoltage and unbalanced voltage, and the voltage is compensated at low voltage to provide stable power to the load. The present invention relates to an automatic voltage regulator for power saving.

      The standard supply voltage supplied from KEPCO, a power supplier, is regulated to be maintained and supplied as shown in Table 1 below in accordance with the Electricity Business Law.

   TABLE 1

Standard voltage Maintenance range 110 V 110V ± 6V (104 ~ 116V) 220 V 220V ± 13V (207 ~ 233V) 380 V 380V ± 38V (342 ~ 418V)

The voltage supplied from the KEPCO varies slightly depending on the length of the wiring according to the installation location of the transformer of the KEPCO, and the voltage drop rate may also be different for each customer. That is, power is supplied from the distribution transformer of one bank to each consumer, and the distribution transformer tab is supplied so that the voltage at the terminal consumer is maintained at 220V. However, the customer near the distribution transformer receives a supply voltage higher than 220V, resulting in overheating and malfunction of the electric equipment, blackening of the lighting equipment, etc., resulting in excessive power consumption and shortening the life of the electric equipment.

      In the way that the power supply voltage is supplied to multiple grounds of 22900V, a heating / lighting transformer is installed between each phase of the distribution line and the middle line (N line), resulting in voltage unbalance due to load unbalance. This also affects the voltage phase between the self-receiving consumer and the inefficient operation of the load, resulting in wasted power.

     In addition, if the customer approaches the daily load curve, the 380 / 220V three-phase four-wire supply falls below the rated voltage of 380 / 220V in the morning and below 360 / 207V in the evening, then rises above 400 / 230V in the early morning. In addition, the voltage fluctuation rate is very large in one day, and the terminal load is wider in the voltage fluctuation.

    Conventionally applied technologies include a frequency inverter method, a method of forcibly stepping down a power supply voltage, a method of obtaining a rated voltage by controlling an excitation winding with an electronic switch, and a method of obtaining a rated voltage using only a slidax. Inverter method is not only expensive but also harmonics, affecting other types of precision devices, causing malfunctions and inefficient efficiency. The voltage can be supplied at any time by stepping down, but under heavy load, a voltage lower than the rated voltage is applied, which affects the efficiency and life of the load and cannot cope with unbalanced voltage.

    The method of obtaining the rated voltage by controlling the excitation winding with the electronic switch is inconvenient and unreasonable because the unbalanced voltage cannot be removed because the excitation winding of each phase is simultaneously opened and closed in pairs.

     The method of obtaining the rated voltage by manually adjusting the tap using only the slide dax is very expensive to manufacture and transport because the capacity of each phase transformer is very large compared to other methods of the same capacity.

     In order to solve the above problems, the present invention provides an automatic voltage regulator for a power saver using a voltage converter on the secondary side of a circuit breaker of a consumer, and performs a proportional control to the peripheral voltage of each phase using a voltage converter to convert frequency. Concerns about harmonics generated in the inverter method, concerns about low voltage in the method of forcibly stepping down the power supply voltage, concerns about unbalanced voltage in the method of obtaining the rated voltage by controlling the excitation winding with an electromagnetic switch, The objective is to minimize the wasted power by eliminating the concern about size and weight in the scheme and to improve the output voltage and to maintain a constant voltage.

     1 is a circuit diagram of an automatic voltage regulator for a power saver using a voltage changer applied to the technique of the present invention, and FIG. 2 is a partial circuit diagram of FIG. 1 illustrating a winding method of a coil. As follows.

     The load connected to each line is overvoltage and unbalanced voltage from the power supply, and the voltage is different for each phase between the phase line and the middle line. However, for example, as shown in FIG. 2, the input voltage supplied to the first phase is changed when the overvoltage is in equilibrium.

      If the line voltage supplied from KEPCO is 400V, the phase voltage is 230V at 400 / √3. If the target value is set to 220V at the customer, the PCB starts the stepping motor in the step-down direction to set the output voltage to 220V toward the target value and operates until the output voltage of the supply power becomes 220V, stepping at the point of 220V. Stopping the motor causes the voltage to fall between A and N.

      If the voltage ratio of the peripheral voltage is reduced to 220 / 20V, 10V is stepped down by applying (220 * 10) / 20V = 110V from the proportional excitation winding of the voltage transformer to the proportional excitation winding of the voltage transformer.

     Therefore, the output line of the proportional excitation winding of the voltage converter applies the proportional voltage to the excitation winding of the peripheral voltage to step down the voltage by 10V and send the output.

     If the line voltage supplied from KEPCO changes from 400V to 380V, the phase voltage becomes 380 / √3 and 220V. To set the output value to 220V, the PCB starts the stepping motor in the step-down direction to set the output voltage to 220V and operates until the output voltage of the supply power becomes 220V. Stops the voltage between A and N.

    If the line voltage supplied from KEPCO changes from 380V to 360V, the phase voltage becomes 207V at 360 / √3. To set the output value to 220V, the PCB starts the stepping motor in the boosting direction to set the output voltage to 220V and operates until the output voltage of the supply power becomes 220V, stepping motor at the point of 220V. Stops the voltage between A and N.

    As above, if voltage higher than setting value is applied to A phase, B phase, C phase or unbalanced voltage is supplied to the power supply side, PCB controller board receives the voltage signal and load voltage by operation, comparison and control operation of PCB internal microcomputer. By controlling the voltage through the stepping motor, the proportional voltage of the proportional excitation winding of the voltage variable is controlled to apply the proportional voltage to the proportional excitation winding of the peripheral voltage so that the output voltage is constantly supplied to operate at the optimum efficiency. It is a system that can save power by eliminating wasted power.

In addition, it is also possible to mount a PCB board implemented to extract the voltage control amount from the AN, BN, CN for controlling the proportional excitation winding of the voltage variable and receive a signal, and to individually control from each group, the microcomputer is equipped with The PCB can also be used by mounting a PCB using an external setpoint key that automatically controls the output voltage to allow the PCB to be manipulated externally.

      Therefore, the present invention controls the proportional voltage excitation winding of the voltage variable and the peripheral voltage in the form of step-up / step-down by a controller with a built-in microcomputer, so that even if the applied voltage differs from time to time, the optimum rated voltage is acceptable. It is a technology invented to supply power equipment.

     The present invention is the invention for the most efficient use in the process of using the electrical equipment as described above, by using the voltage flowing in each line as the optimum rated voltage of the customer to minimize the power consumption to reduce power, It not only contributes to various economic effects such as life extension and suppression of temperature rise, but also has a great influence on maximum demand power management.

      Using a conventional automatic voltage regulator as a means to prevent voltage unbalance and voltage fluctuations is not only expensive, but also has low efficiency and a large amount of lost power in the process of changing power inside the regulator. Automatic voltage regulator for power saver When it becomes automatic voltage regulator of step up / down type, its own power loss is very low and its volume is small, so it can be manufactured at low price and the manufacturing process is simple.

      In particular, this technology can be used as a general purpose automatic voltage regulator and power saver as well as a special purpose device, so the effect can be greatly spread in terms of energy saving.

      This technology adds a communication signal that can manage up to the maximum power of a customer and a device that can deliver voice messages to a user in the event of a failure. By enabling the management of maximum demand power, there is a characteristic effect that can incorporate various effects that can reduce the maximum peak capacity of KEPCO.

Claims (3)

      Each of the power supply phases (AN, BN, CN) is configured by connecting the excitation winding of the peripheral voltage to the output of the voltage converter proportional voltage winding and the voltage transformer proportional winding connected in parallel with the peripheral pressure winding. A PCB with a built-in microcomputer that senses a control amount supplied from an input / output voltage sense on a power supply voltage applied to the power supply, and automatically controls a target value by an external setting value for each group; By configuring the stepping motor to switch in the step-up, step-down direction for each group by the control by the detection value of the microcomputer-embedded PCB, When a voltage higher than the set value is applied to each phase or an unbalanced voltage is supplied to the power supply side, the PCB controller board draws a voltage signal and proportions the voltage variable so that the load voltage is balanced by the operation, comparison, and control operation of the microcomputer internal PCB. An automatic voltage regulator for a power saver using a voltage variable, characterized in that to control the voltage through the stepping motor of the excitation winding by applying a proportional voltage to the proportional excitation winding of the peripheral voltage supply. The method of claim 1, Power saving using a voltage transformer, characterized in that it is equipped with a PCB board implemented to take out the voltage control amount from AN, BN, CN to control the proportional excitation winding of the voltage variable and receive a signal, and to individually control each group. Automatic voltage regulator for the machine. The method of claim 1, Automatic voltage regulator for power saver using a voltage converter, characterized in that the PCB is mounted using an external set value key to automatically control the output voltage so that the microcomputer is equipped with a set value can be controlled from the outside.

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