KR20020029687A - The Exclusive DC Power Supplier for the Electrical Protector - Google Patents

Abstract

PURPOSE: A DC power supply for a protector device is provided to perform always a normal operation of the protector device regardless of the charging battery error by supplying a charging power of the charging battery temporarily to the protector device when power failure is on the AC power source terminal. CONSTITUTION: A DC power supply(50) comprises an AC noise filter(51) for removing surge or noise induced from the AC power source(4), an AC detecting circuit(54) for outputting a detecting signal by detecting a power failure situation of the AC power source(4), a thermal sensor(55) for outputting a thermal signal by detecting inside temperature of the control box, a rectifying circuit(52) for outputting constant voltage by rectifying the AC power, an input converter(53) for receiving the constant voltage from the rectifying circuit and the charging voltage from the charging battery, and outputting selectively the voltage according to the predetermined control signal, an external characteristic protection circuit for receiving the constant voltage from the rectifying circuit and charging the charging battery according to the external characteristic, and a micom controller(56) for controlling the output of the input controller by receiving the detecting signal of the AC detecting circuit, and controlling the external characteristic protection circuit to charge the charging battery in optimal status.

Description

DC Power Supplier for the Protector {The Exclusive DC Power Supplier for the Electrical Protector}

The present invention relates to a DC power supply device for a power system protection device, specifically, when AC power is normally applied, the rectified voltage rectified in the rectifier circuit is applied to the protection device, and when AC power is abnormally applied, the charging power applied from the charging battery. This invention relates to a DC power supply for a power system protection device for improving supply reliability of a distribution system and supplying high-quality power to a customer by controlling a power to be applied to a protection device and then supplying a constant voltage after opening for a predetermined time. .

In general, the protection devices used in the power system are representative of circuit breakers and switchgear, and in particular, the automatic reclosing circuit breaker and section analyzer, which automatically detects and breaks down when there is an abnormality in the line, The control method of the protection device including switchgear such as gas insulated switchgear that can be operated in the main control box or the central control room, automatic switching switch, etc. is DC blocking method and CT blocking method. It is used.

However, the DC blocking method is cumbersome to manage the charging battery and the DC power circuit periodically, and it is difficult for the establishment to ignore all the protective device charges, and in particular, it is difficult to maintain and maintain the periodic protection devices such as lack of power source. It is a reality.

On the other hand, the main cause of the failure of the protection device is that the internal DC power supply circuit (charging circuit) of the control box consists of only a simple rectifier circuit, so that defects in external characteristics such as internal temperature changes, voltage fluctuations, overcharging and discharging, and the effect of charging battery memory are prevented. It is known that it is known, but it depends only on periodic management, and most of the protectors are manufactured and produced domestically by technical cooperation with foreign companies such as McGraw Edison-Iljin Electric, Westinghouse-Dry Electric, etc. It knows the defects and inconveniences of the protection equipment itself, but it is not enough to develop localization such as lack of technology and defects of domestic manufacturers.

As a specific example, most of the protection devices installed in Jeonju to protect the distribution system are converted to AC power and used as DC power. The DC power supply inside the protection device control box is composed of rectifier circuit and charging battery.

1 is a field installation of a conventional protection device.

In order to protect the distribution system, a protective device is installed in the telephone pole to control when a failure occurs in the distribution system. (3) Detects the failure and blocks the special high voltage line (1) from the protective device body (2). The protection device is operated by the DC power supply of the charging battery 6 to detect the internal failure of the compartment and the operation of the body 2.

Fig. 2 is a block diagram of a DC power supply of a conventional protection device. As a DC power supply of the current protection device, an AC power supply 4, a rectifying circuit 5, a charging battery 6, a control circuit 7 are provided. In order.

In this configuration, when the rectifier circuit (5) fails or the charging battery (6) is defective (discharged), the protection device does not operate normally and the control device control box (3) does not turn on / off the operation. There is a problem in that it can not cause a wide area, a long power outage.

On the other hand, for manual operation of the protective device body (2), it is necessary to cut off (off) the switch on both the power supply side and the load side of the protection device, and to perform ON / OFF operation on the protection device body (2) under no voltage. Due to defects in the DC power supply of the protection device, wire and wireless operation is impossible and reliability is deteriorated.

In addition, since the rectifier circuit 5 is configured only for simple charging in the series method, the charging battery 6 is repeatedly charged and discharged repeatedly by the change of the DC charging voltage when the voltage of the AC power supply 4 changes. 3) There is no protection circuit according to the internal temperature change (day and night, seasonal) and charging method of charging battery (6), which shortens the life of charging battery (6).

In particular, when looking at the temperature characteristics of the nickel-cadmium battery, there is no charging battery protection circuit during the charging process according to the temperature change of -10 ℃ ~ 60 ℃ inside the control box (3) The temperature difference between 25 ℃ ~ 60 ℃ Overcharge and overdischarge with repeated battery voltage drop of ± 2V or more is repeated during generation, which shortens the lifespan due to memory phenomenon.In addition, the voltage fluctuation characteristics indicate that the AC power source voltage is the voltage according to the day / night and load characteristics. The fluctuation is severe and the rectifier circuit 5 must charge the DC voltage to the charging battery constantly regardless of the power supply voltage. However, since the constant voltage circuit is not configured, the battery life of the charging battery 6 is shortened.

At this time, the average number of charge / discharge cycles of the nickel-cadmium rechargeable battery is about 1000 times, and the number of charge and discharge changes in external characteristics of the rechargeable battery 6 is about 3 to 6 times a day on average, about 166 to 333 days. .

According to the result of the precise analysis of the failure of the protection device, more than 70% to 80% of the battery failure occurs due to repetitive overcharge and discharge of the protection device.As a cause of the shortening of the battery life, the change in external characteristics of the nickel-cadmium battery By repeating the full charge / discharge cycle, a "memory phenomenon" occurs that loses the original charge battery capacity.In addition, if the charge battery is repeatedly charged and discharged without full charge / discharge by continuously connecting the charge battery to the load for more than 24 hours, the charge battery cell In the crystal-like casting inside the cell, an electrical short or high self discharge due to spark formation occurs.

Accordingly, when the protection device is suspended for a long time due to a cease-fire operation or other reasons, the charging battery power circuit does not charge rapidly due to poor charging characteristics of the power supply circuit, and it takes more than 24 hours to fully charge. There is no charging battery characteristic protection circuit according to external characteristics such as change, so that the charging battery is collected and charged in a separate charger at least once a quarter, which causes difficulty in management.

3 is a connection diagram of a conventional charging device control box internal charging battery.

As shown in FIG. 3, the charging battery 6 is connected to the control circuit 7 inside the control box 3 so that the charging battery 6 is repeatedly charged and discharged according to the load characteristics, thereby improving the life of the charging battery. It causes shortening

As such, there is a problem with the DC power supply of the current protection device, so it is necessary to check the charging state of the charging battery periodically, and also to charge the charging battery (6) regularly. (6) In case of failure, it is necessary to replace it periodically to prevent the failure of the protection device, so it has a disadvantage of too much time and expense.

The present invention is derived to solve the problems as described above, the object of the present invention is to supply a constant voltage to the protection device without going through the charging battery in the DC power supply for the protection device when the AC power is normally applied, In the event of a power failure, the charging power of the charging battery is temporarily supplied to the protection device so that the protection device can operate normally regardless of the failure of the charging battery.

Another object of the present invention is to increase the life of the charge battery by charging in an optimal state in consideration of AC power fluctuations, temperature changes, characteristics of the type of charge battery.

1 is a field installation of the conventional protective equipment.

2 is a block diagram of a DC power supply of a conventional protection device.

Figure 3 is a connection diagram of a conventional charging device control box internal charging battery.

Figure 4 is a block diagram of a DC power supply for the protection device according to the present invention.

Figure 5a is a connection diagram of the control box internal DC power supply external charging battery according to the present invention.

Figure 5b is a connection diagram of the charging box internal DC power supply built-in control box according to the present invention.

<Description of the code | symbol about the principal part of drawing>

1: Special high voltage line 2: Body of protective device

3: control device control box 4: power 220V

5: existing rectification circuit 6: charging battery

7: protective device control circuit 50: DC power supply for the protective device

According to the present invention, a DC power supply device for supplying a stable DC power to a protection device using a DC power cut-off method removes surge and noise flowing from the AC power when AC power is applied, thereby outputting a stable AC power. A rectifier circuit rectifying the AC power output from the AC noise filter and outputting a constant voltage; and an AC detection circuit detecting the presence or absence of a power failure; and a charging battery for charging a predetermined voltage to output a charging voltage. An external characteristic protection circuit for charging the charging battery using the constant voltage output from the circuit; And an input converter connected to the constant voltage output from the rectifier circuit and the charging voltage of the charging battery to selectively output the protection device. And when the AC detection circuit detects that AC power is normally applied, the input changer controls to output a constant voltage, and when an abnormality of AC power is detected, the input changer controls to output the charging voltage, and the external characteristic protection circuit charges the battery. It characterized in that it comprises a microcomputer controller for generating a control signal to charge.

Preferably, the rectifier circuit outputs a constant voltage at all times regardless of the voltage change of the AC power source using the SMPS rectification method, and adds a temperature sensor to the basic configuration to sense an external temperature and apply a detection signal to the microcomputer control unit. The microcomputer control unit may receive the detection signal and apply a control signal for controlling the external battery to charge the charging battery.

The microcomputer control unit may set the input converter to output the constant voltage after a predetermined changeover time, for example, 30 seconds, is detected when the momentary power failure is detected from the AC detection circuit.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of a DC power supply device 50 for protecting equipment according to the present invention.

As shown in FIG. 4, the DC power supply device 50 for protecting equipment according to the present invention includes an AC noise filter 51 for removing surge and noise flowing from the AC power source 4, and an AC power source 4. AC detection circuit 54 for detecting the presence of power outage and generating a detection signal, temperature sensor 55 for sensing the temperature inside the control box (not shown) and outputting a temperature signal, and AC power supply 4 rectified. A rectifier circuit 52 for always outputting a constant voltage, an input converter 53 for selectively outputting a voltage according to a predetermined control signal while receiving a constant voltage of the rectifier circuit and a charging voltage of the charging battery 6, and a rectifier circuit. An external characteristic protection circuit for charging the charging battery 6 according to external characteristics by receiving the constant voltage output from the 52 and the detection signal of the AC detection circuit 54 is applied to control the output of the input converter 53. The external battery protection circuit 57 is controlled to maximize the charging battery 6. The microcomputer control unit 56 controls to charge the hostile state.

Specifically, the rectifier circuit uses the SMPS method, the microcomputer controller 56 controls the input converter 53 to basically output the constant voltage of the rectifier circuit 52, and the AC detection circuit 54 controls the AC power source 4. When a detection signal for detecting an abnormality is applied, the input converter 53 is connected to apply a control signal for controlling to output the charging voltage of the charging battery 6.

Then, after the input converter 53 is controlled to output the charging voltage, and after the predetermined time, for example, 30 seconds, the control to output the constant voltage, the charging voltage of the charging battery 6 by the normal instantaneous power outage for 30 seconds Since it is discharged, it is controlled to protect the voltage of the charging battery 6.

According to this configuration, the operation of the DC power supply device 50 according to the present invention is as follows.

When the AC power supply 4 is normally applied as usual, the AC noise filter 51 removes the noise in the AC power supply 4 and applies it to the rectifier circuit 52, and the AC detection circuit 54 supplies the applied AC power supply ( Detects that 4) is normal and transmits a detection signal to the microcomputer control unit 56.

The AC power supply 4 from which the noise is removed from the AC noise filter 51 is rectified by the rectifier circuit 52, converted into a predetermined constant voltage, and applied to the input converter 53.

In addition, the microcomputer controller 56 controls the external characteristic protection circuit 57 to receive a constant voltage from the rectifier circuit 52 to apply a control command to charge the charging battery 6 in an optimal state, and simultaneously input The converter 53 outputs a constant voltage and applies it to the protective device control circuit 7.

This action acts to provide a constant voltage without passing through the charging battery 6 while the AC power source 4 is normally applied, thereby reducing the burden on the charging battery 6.

At this time, when the AC power 4 is abnormally applied, the AC detection circuit 54 detects that the applied AC power 4 is abnormal and transmits a detection signal to the microcomputer controller 56.

Then, the microcomputer control unit 56 outputs the charging voltage from the input converter 53 to be applied to the protection device control circuit 7 so that the protection device (not shown) can continue to operate normally, and the charging battery 6 is After the charging voltage is applied to the input converter 53 for a predetermined time, for example, 30 seconds, the process returns to the charging process.

As described above, if the charging battery is used to enter the charging process again after using the charging voltage for a predetermined time, the charging battery is charged in an optimal state, and it is possible to manage the charging according to characteristics, so that the aging of the charging battery is delayed and charged. The battery can be used semi-permanently.

5a and 5b are various embodiments according to the arrangement position of the charging battery (6).

FIG. 5A is a connection diagram of an example in which the charging battery 6 is arranged outside the control box 3 of the DC power supply device 50 according to the present invention, and the charging battery 6 is formed outside the control box 3. The internal thermal stress is reduced, and the DC power supply device 50 for the protection device can be simply installed in the control box 3 without changing the rectification (charge) circuit in the existing protection device.

And, Figure 5b is installed at the same time to control the DC power supply device 50 and the charging battery integrally (3) when manufacturing the protection device according to the present invention can reduce the overall size, the charging battery (6) to the outside As it is not exposed, the aging phenomenon due to the external weather condition is delayed and thus it can be used for a long time.

Although the embodiments of the present invention have been described in detail as described above, those of ordinary skill in the art may be modified or changed as many as possible without departing from the spirit and spirit of the present invention. You will know

As described in detail above, according to the present invention, if only AC power is applied, it is possible to prevent the operation of the protection device when the charging battery is defective (discharged). Can improve the reliability of the city.

In addition, the time required for charging and charging battery management is not necessary because separate charging management and periodic charging battery replacement are required in consideration of the change of AC power voltage, temperature change inside the control box, and charging characteristics for each type of charging charging battery. It is effective to save money and expenses.

Claims (5)

In the DC power supply for supplying a stable DC power to the protection device including a circuit breaker and a switch, An AC noise filter that outputs stable AC power by removing surges and noise flowing from the AC power when AC power is applied; A rectifier circuit for rectifying the AC power output from the AC noise filter and outputting a predetermined constant voltage; AC detection circuit for detecting the presence of power outage of the AC power; A charging battery that outputs a charging voltage by charging a predetermined voltage; An external characteristic protection circuit for charging the charging battery using the constant voltage output from the rectifier circuit; An input converter connected to the constant voltage output from the rectifier circuit and the charge voltage of the charging battery and selectively output to the protection device; And The input changer controls to output the constant voltage when the AC power is normally applied from the AC detection circuit. When the abnormality of the AC power is detected, the input changer controls to output the charging voltage. And a microcomputer controller for generating a control signal to charge the charging battery by a characteristic protection circuit. The method of claim 1, The rectifier circuit is a DC power supply for the power system protection device, characterized in that using the SMPS rectification method. The method of claim 1, When the external temperature is sensed and a detection signal is applied to the microcomputer control unit, the microcomputer control unit receives the sensing signal to further apply a control signal for controlling the external battery to charge the charging battery to the external characteristic protection circuit. DC power supply for power system protection, characterized in that included. The method of claim 1, And the microcomputer controller controls the input converter to output the constant voltage after a predetermined changeover time has elapsed when a momentary power failure is detected from the AC detection circuit. The method of claim 4, wherein The predetermined switching correction time is a DC power supply for a power system protection device, characterized in that 30 seconds.