KR102572602B1 - Magnetic force regenerative controller - Google Patents

Abstract

The present invention relates to a self-powered regeneration controller, without supplying an external power supply for driving a ventilation fan for ventilating the air inside the junction box to prevent dew condensation by offsetting the temperature difference between the air inside and outside the junction box in a cable junction box. It is possible to secure driving power for the ventilation fan by inducing secondary current to the current transformer using the magnetic field of the current of the high voltage line in the cable junction box. In addition, a self-powered regeneration controller capable of minimizing waste as reactive power through power factor correction when charging secondary power transformed through a current transformer to a supercapacitor, which is a charging unit, is provided.

Description

Magnetic force regenerative controller}

The present invention relates to a self-powered regeneration controller, and more particularly, to solve various problems caused by dew condensation inside a cable junction box for power supply in a railway station by periodically ventilating the inside of the junction box. , It relates to a self-powered regeneration controller that drives a ventilation fan by using a magnetic field of a current flowing through a power supply cable to offset the temperature difference of outside air and prevent dew condensation.

In general, when high-voltage distribution lines are installed between railway stations, connection boxes for cables (22,900V) for power supply are installed and operated at predetermined intervals between receiving substations in each station.

This cable junction box for power supply has a high voltage line (distribution line) built in, and prior art related to this cable junction box is Patent Publication No. 10-2004-0003931 (Reference 1), Utility Model Registration No. 20-0314282 (Reference 2), Patent Registration No. 10-0643184 (Reference 3), etc. have been proposed.

Reference 1 above relates to an outdoor cable junction box with a built-in disconnector and a method for detecting a failure of a power cable using the same. A cable junction box with a built-in disconnector for quickly checking and repairing the faulty section in the event of a cable failure and a fault detection method using the same are proposed, and Reference 2 relates to a cable junction box for ground installation, and railway stations and station terminals and cable connection box for ground installation is proposed to quickly and accurately check faulty sections such as poor cable insulation of high-voltage distribution lines for supplying signal power. A straight junction box for high-voltage cables is proposed to quickly and accurately check and repair faulty sections of high-voltage distribution lines for supplying station terminals and signal power.

However, in order to solve various problems caused by dew condensation inside the cable (22900V) junction box, the conventional cable junction box periodically ventilates the inside of the junction box to reduce the temperature difference between the junction box and the inside and outside air. In order to ventilate the air inside the junction box to prevent dew condensation, a power source capable of driving a ventilation fan is required, but there is no power source other than AC 22,900V high-voltage power for supplying power to the station in the junction box. Since the cable junction box is powered by AC 22,900V 24 hours a day, it cannot be used by connecting other devices to the high voltage power supply.

Reference 1: Patent Publication No. 10-2004-0003931 Reference 2: Registered Utility Model No. 20-0314282 Reference 3: Registered Patent No. 10-0643184

The present invention has been made to solve the above problems, and an object of the present invention is to prevent condensation inside the junction box by canceling the temperature difference between the inside and outside air of the junction box without receiving external power in the cable junction box. To provide a self-powered regeneration controller capable of securing drive power for a ventilation fan by inducing a secondary current to a current transformer using a magnetic field of a high-voltage line current in a cable junction box to drive a ventilation fan that ventilates air.

In particular, the present invention provides a self-powered regeneration controller capable of increasing weak power of a current transformer when a secondary current is induced into the current transformer using a magnetic field of a high voltage line current in a junction box.

In addition, another object of the present invention is to provide a self-powered regeneration controller capable of minimizing waste of reactive power through power factor correction when charging secondary power transformed through a current transformer to a charging unit.

The present invention to solve such a technical problem;

A current transformer that induces a secondary current by using the magnetic field of the current flowing in the high-voltage line inside the cable junction box, a rectifier that converts the output power of the current transformer into direct current power, and a ventilation fan that ventilates the air inside the cable junction box It provides a self-powered regeneration controller comprising a charging unit for charging the DC power rectified through the rectifying unit in order to drive.

At this time, the current transformer is characterized in that it consists of a plurality of 'c'-shaped cores formed in a 'c' shape and arranged in multiple layers, and a bobbin wound around a coil and disposed on each of the plurality of 'c'-shaped cores.

In addition, the 'c'-shaped cores are arranged vertically at regular intervals so that one end and the other end face one direction to form a multilayer, and the bobbin is inserted into one end or the other end of each of the 'c'-shaped cores in the vertical direction. It is characterized in that it is arranged to cross in a zigzag manner.

In addition, a power factor correction unit for compensating for a power factor of the output power of the current transformer is further provided between the rectifying unit and the charging unit.

At this time, the power factor correction unit includes a coil L1 having one end connected to the output terminal of the rectifying unit and the other end connected to the input terminal of the charging unit, and a resistor R1 and a capacitor C2 connected to the other end of the coil L1. And, a field effect transistor (FET) Q1 having a drain connected to the other end of the coil L1 and a source connected to ground, and a connection point between the resistor R1 and the capacitor C2 and the field effect transistor (FET) ) (Q1), a diode (D3) having both ends connected between the drain, and a thyristor ( SCR1) and resistor R2, a zener diode D4 having one end connected to the gate of the thyristor SCR1 and the other end connected between the connection point between the resistor R1 and the capacitor C2, and the resistor R1 ) and a capacitor (C1) connected to the connection point of the capacitor (C2).

At this time, the rectifying unit is composed of a bridge rectifier (D1), and the charging unit is characterized in that it includes a super capacitor (C3) and a diode (D2).

According to the present invention, the effect of preventing condensation by canceling the temperature difference between the inside and outside air of the junction box by driving a ventilation fan by inducing a secondary current to the current transformer using the magnetic field of the current of the high voltage cable in the cable junction box without supplying external power there is

In addition, according to the present invention, by improving the structure of the current transformer that induces the secondary current using the magnetic field of the high-voltage line current in the junction box, the weak power of the current transformer is increased to sufficiently secure power for driving the ventilation fan. There are advantages.

In addition, the present invention has the advantage of minimizing power consumption by compensating the power factor with only a small secondary current of the current transformer transformed through the current transformer without using a power-consuming semiconductor (PWM IC).

1 is a control configuration diagram for driving a ventilation fan of a self-powered regeneration controller according to the present invention.
2 is a perspective view showing a multilayer type current transformer (CT) of a self-powered regeneration controller according to the present invention.
3 is a plan view showing a multilayer type current transformer (CT) of a self-powered regeneration controller according to the present invention.
4 is a front view showing a multilayer type current transformer (CT) of the self-powered regeneration controller according to the present invention.
5 is an example of a secondary side power supply circuit diagram of a multilayer current transformer (CT) of the self-powered regeneration controller of the present invention.
FIG. 6 is a diagram illustrating waveforms of voltage and current during charging of the capacitor according to the circuit configuration of FIG. 5 .
7 is another example of a secondary side power supply circuit diagram of a multilayer type current transformer (CT) of the self-powered regeneration controller of the present invention.
FIG. 8 is a diagram illustrating waveforms of voltage and current during charging of the capacitor according to the circuit configuration of FIG. 7 .

Hereinafter, the characteristics of the self-powered regeneration controller according to the present invention will be understood by referring to the accompanying drawings by way of an embodiment described in detail.

Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only one of the most preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, so at the time of this application, they can be replaced. It should be understood that there may be many equivalents and variations.

Referring to FIG. 1, the self-powered regeneration controller according to the present invention is a current transformer (CT) that induces a secondary current by using a magnetic field of a current flowing in a high voltage cable 2 in a cable junction box 1 without supplying external power ( 10), a rectifying unit 20 that converts the output side power of the current transformer (CT) 10 into DC power, and a charging unit 30 that charges the DC power rectified through the rectifying unit 20.

Of course, a ventilation fan 40 that ventilates the air inside the cable junction box 1 to prevent dew condensation by offsetting the temperature difference between the inside and outside air of the cable junction box 1 using the power charged in the charging unit 30 ) to drive

Through this configuration, it is possible to prevent dew condensation by periodically ventilating the inside of the cable junction box (1) to offset the temperature difference between the cable junction box (1) and the inside and outside air of the cable junction box (1). It is possible to solve various problems caused by dew condensation inside the cable for power supply (eg, 22,900V) junction box.

Hereinafter, the configuration of each part of the present invention will be described in detail.

First, the present invention induces a secondary current using the magnetic field of the current of the high voltage line 2 through a current transformer (CT) 10 to secure driving power for the ventilation fan 40. In this case, the power used in each station is different, but on average, about 2 to 5 A of current flows through the high-tension line 2 during the working hours of the station, etc., and about 0.5 A after work.

Accordingly, the secondary current obtained from the current transformer (CT) 10 having a general structure inducing the secondary current is about 20 mA at most when the primary current is assumed to be 2 A, and is too weak to drive the ventilation fan 40. . In this case, the secondary current and voltage of the current transformer (CT) 10 change according to the number of turns of the winding coil of the current transformer (CT) 10, and the voltage decreases when the current is increased, and the current decreases when the voltage is increased. As a result, the secondary power that can be obtained is the same regardless of the number of windings.

I _out = I _in /n (where I _in is primary current, I _{out is} secondary current, n = number of turns)

V _out = K * (I _in /n) * RL (where K = core coupling, I _in is primary current, RL = load resistance, V _{out is} secondary voltage)

Accordingly, to secure power capable of driving the ventilation fan 40, the current transformer (CT) 10 has a multilayer structure to increase induced secondary power.

The structure of this current transformer (CT) 10 is the same as in FIGS. 2 to 4 . Referring to this, the current transformer (CT) 10 is a multi-layered current transformer, in which a plurality of 'c'-shaped cores 11 arranged in multiple layers are formed in a 'c' shape and a coil is wound, and the plurality of 'c'-shaped cores 11 are wound. It consists of a plurality of bobbins 12 disposed intersectingly intersecting one end (left side) and the other end (right side) of the female core 11.

At this time, the 'c'-shaped core 11 is formed in a 'c' shape with one end 11a and the other end 11b facing in one direction, and is arranged vertically at regular intervals to form multiple layers.

In addition, the bobbin 12 has a structure in which a coil is wound, and a plurality of bobbins 12 are arranged by being inserted into one end 11a or the other end 11b of the plurality of 'c'-shaped cores 11. In this case, when the coil-wound bobbin 12 is inserted into one end 11a of the lower 'c'-shaped core 11, the coil-wound bobbin 12 is not inserted into the other end, and the adjacent upper ' A bobbin 12 on which a coil is wound is inserted into the other end of the 'c'-shaped core 11. That is, the 'c'-shaped core 11 arranged in multiple layers forms a plurality of 'c'-shaped cores 11 arranged in multiple layers as the bobbin 12 in which coils are alternately wound is inserted at one end 11a and the other end 11b. A plurality of bobbins 12 in which coils are wound on the 'shaped core 11 are arranged to cross each other in a zigzag manner.

This multi-layer current transformer arranges the bobbins on which the coils are wound crosswise on the left and right sides to make the overall final height slim (for example, 71 mm in height), while the 'c'-shaped core 11 and the bobbin 12 An increased induction power corresponding to the number of can be obtained. For example, when the number of layers of the 'c'-shaped core 11 and the bobbin 12 of the multilayer current transformer is 5, induced power corresponding to 5 existing single-layer (or single) current transformers can be obtained.

Meanwhile, in order to drive the ventilation fan 40 with the secondary power obtained from the current transformer (CT) 10, the charging unit 30 needs to be charged. In the case of a normal battery, it is possible to charge a larger current than a capacitor, but since a long lifespan cannot be guaranteed due to a limitation in the number of charge/discharge cycles, the charging unit 30 is preferably composed of a capacitor, particularly a large-capacity capacitor.

At this time, as shown in FIG. 5, the output side power, which is the secondary power obtained from the current transformer (CT) 10, is rectified through the rectifying unit 20 and can be directly charged to the charging unit 30, but in this case, the power factor Due to the degradation, the active power is about 50%, and the remaining 50% is wasted as reactive power.

More specifically, when the capacitor is directly charged with the current obtained from the current transformer (CT) 10, voltage and current waveforms as shown in FIG. 6 appear. According to this, the current charged in the condenser is not charged according to the voltage, but is charged in the condenser for a short time at the peak of the voltage to become effective power, and the remaining current is not charged, and the current transformer (CT) passes through the diode bridge forming the rectifier 20 as it is Returning to (10), the reactive power increases. If the power factor is 50%, 50% of the 100% current obtained from the current transformer (CT) 10 is used and 50% is wasted current. After the capacitor 31 is charged to some extent, it can be seen that only a very slight current is charged.

As a result, as shown in FIGS. 5 and 6, when the secondary side current of the current transformer is directly charged, the displayed current waveform exists only for a short time at the peak of the voltage, and the voltage and current waveforms are different depending on the time when the voltage is present but there is no current. The power factor decreases, and after the supercapacitor is partially charged during direct charging, the charging current drops significantly due to the increase of the empty period without current.

Of course, as a solution to the problem of wasted current from the current obtained from the current transformer (CT) 10, a power factor correction (PFC) circuit using a general power factor correction IC (Integrated Circuit) can be configured, but a commercial power source must be supplied. In addition, since driving power of the IC itself is consumed, in the present invention, it is preferable to configure as shown in FIG.

According to FIG. 7, the rectifying unit 20 is connected to the output terminal of the current transformer (CT) 10, and the power factor correction unit 50 is provided between the rectifying unit 20 and the charging unit 30 so that the current transformer (CT) 10 ) compensates for the power factor of the output power.

The rectifying unit 20 includes a bridge rectifier D1 composed of four diodes, and the charging unit 30 includes a super capacitor C3 and a diode D2.

The power factor correction unit 50 includes a coil L1 having one end connected to the output terminal of the rectifying unit 20 and the other end connected to the input terminal of the charging unit 30, and a resistor connected to the other end of the coil L1 ( R1) and capacitor C2, a field effect transistor (FET) Q1 having a drain connected to the other end of the coil L1 and a source connected to ground, and a connection point between the resistor R1 and the capacitor C2 A diode (D3) having both ends connected between the drain of the field effect transistor (FET) (Q1), the connection point between the resistor (R1) and the capacitor (C2), and the gate of the field effect transistor (FET) (Q1) A thyristor (SCR1) and a resistor (R2) connected in series therebetween, and a zener diode (D4) having one end connected to the gate of the thyristor (SCR1) and the other end connected between the connection point between the resistor (R1) and the condenser (C2). ) and a capacitor C1 connected to the junction of the resistor R1 and the capacitor C2.

More specifically, one end of the coil (L1) is connected to the output terminal of the bridge rectifier (D1) to receive DC power, and the other end of the coil (L1) is provided at the input terminal of the charging unit 30 At the same time, one end of the resistor (R1) is connected to the diode (D2), one end of the capacitor (C2) is connected to the other end of the resistor (R1), and the other end of the capacitor (C2) is connected to the ground. Accordingly, the current rectified through the bridge rectifier D1 may be charged in the capacitor C2 through the coil L1 and the resistor R1.

Also, the anode of the diode D3 is connected to the connection point of the resistor R1 and the capacitor C2, and the cathode is connected to the drain of the field effect transistor (FET) Q1.

In addition, the source of the field effect transistor (FET) (Q1) is connected to the ground, the gate is connected to one end of the resistor (R2), and the other end of the resistor (R2) is connected to the cathode of the thyristor (SCR1), the The anode of the thyristor (SCR1) is connected to the connection point of the resistor (R1) and the capacitor (C2).

In addition, the anode of the thyristor (SCR1) is connected to the anode of the zener diode (D4), and the cathode of the thyristor (SCR1) is connected between the junction of the resistor (R1) and the capacitor (C2).

And, the condenser C1 has one end connected to the connection point of the resistor R1 and the condenser C2 and the other end connected to the ground.

This configuration provides a square wave to the gate of the field effect transistor (FET) (Q1), which is a switching element. Since is almost consumed, it can solve the point that it is not very meaningful to apply.

That is, according to the present invention, the power factor can be compensated with only a small secondary current of the current transformer (CT) without using a semiconductor (PWM IC).

Hereinafter, an operation example of a charging circuit having a power factor correction unit at an output terminal of a current transformer (CT) will be described with reference to FIGS. 7 and 8 .

First, the current of the output terminal of the current transformer (CT) 10 flows through the path of the bridge rectifier (D1), the coil (L1) and the resistor (R1) to charge the capacitor (C2).

In this way, when the capacitor C2 is charged and the voltage of the capacitor C2 reaches 12V, the gate of the thyristor SCR1 is triggered through the zener diode D4. The cathode is conducted so that the current of the capacitor C2 charges the capacitor C1 and turns on the field effect transistor (FET) Q1 through the resistor R2. The field effect transistor (FET) Q1 is turned off when the gate voltage drops below a threshold voltage (eg, about 4V).

When the field effect transistor (FET) Q1 is turned on (TURN ON), point “B” of coil L1 is momentarily shorted to the ground, and accordingly, the voltage at point “B” becomes 0V for a short moment ( For several u-sec), current rapidly flows from one end "A" of the coil L1 to the other end "B".

At this time, counter electromotive force is generated due to a rapid change in current, which is a characteristic of the coil L1, so that the flow of current in the coil L1 is suppressed, and at the same time, the capacitor C2 is turned on through the diode D3. A complete discharge is made via a phosphorus field effect transistor (FET) (Q1).

Then, the capacitor C2 is discharged to 0V, and the residual voltage exists in the capacitor C1, so that the anode and cathode of the thyristor SCR1 become reverse voltages and are turned off.

On the other hand, when the voltage of the condenser (C1) falls below the threshold voltage (about 4V) of the gate of the field effect transistor (FET) (Q1), the field effect transistor (FET) (Q1) is turned off, and thus the field effect transistor (Q1) is turned off. When the (FET) (Q1) is turned OFF, the counter electromotive force BOOSTed (stepped up) in the coil (L1) passes through the diode (D2) and charges the supercapacitor (C3) of the charging unit (30). In this case, the path of current flows from point "B" of coil (L1) to path "A" of diode (D2), supercapacitor (C3), ground (GND), diode (D1), and coil (L1). At the same time as the counter electromotive force generated in (L1) is eliminated, a part of the counter electromotive force generated in the coil (L1) charges the condenser (C2) through the resistor (R1).

Thereafter, when the charging voltage of the condenser C2 reaches 12V again, the 120Hz rectified by the bridge rectifier D1 repeats a series of processes of triggering the gate of the thyristor SCR1 through the zener diode D4. The ripple current (point “A” in FIG. 8) is subdivided into several tens of KHz (point “B” in FIG. 8) to charge the supercapacitor (C3) with current.

In this way, after the power factor is improved through power factor correction without directly charging the secondary current of the current transformer, as shown in FIG. The phase of the current becomes the same and the power factor rises.

In addition, stable current can be obtained without loss even at a charging voltage in the range of 22V to 26V, which is the driving voltage range of the junction box ventilation fan.

Here, the switching frequency can be changed by adjusting the values of the capacitors C1 and C2 and the resistors R1 and 2.

On the other hand, the charging power of the charging unit 30 is used to drive the ventilation fan 40 to prevent dew condensation by offsetting the temperature difference between the inside and outside air of the cable junction box 1. In this case, the air ventilation of the cable junction box (1) checks the temperature of the junction box itself and the temperature of the air inside the junction box in units of set time (eg, 5 minutes) so that the difference between the set temperature (eg, 3 ° C) or more It is preferable to further include a control board (not shown) to ventilate the inside of the cable junction box 1 by driving the ventilation fan 40 for a set time (eg, 1 minute).

In this case, the control board is preferably driven by receiving power charged in the super capacitor (C3) of the charging unit (30), and monitors the temperature of the cable junction box (1) itself (box) and the temperature of the air inside the junction box The difference between the temperature of the junction box itself and the temperature of the air inside the junction box is compared.

In addition, it is preferable to prepare for the case where there is no primary current by further providing an auxiliary capacitor (not shown) in the charging unit 30 in addition to the super capacitor C3 so as to always maintain a full charge state, and the super capacitor is charged at 26V It is preferable to drive the ventilation fan 40 even if there is no temperature difference between the rear surfaces.

In addition, it is desirable to have a human body detection sensor, indicator light, and buzzer so that the indicator light is turned on for 5 seconds when the human body approaches the cable connection box (1) and a buzzer alarm sound is generated. It is also preferable to provide a lamp indicating whether the R, S, and T phases of the 229,00V AC three-phase power supply are energized and flicker (for example, turn on for 0.5 seconds and turn off for 0.5 seconds).

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art can make various modifications and variations without departing from the essential characteristics of the present invention. The protection scope of should be interpreted by the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1: cable junction box 2: high voltage cable
10: current transformer (CT) 20: rectifier
30: charging part 40: fan for ventilation

Claims (6)

A current transformer that induces a secondary current by using the magnetic field of the current flowing in the high-voltage line inside the cable junction box, a rectifier that converts the output power of the current transformer into direct current power, and a ventilation fan that ventilates the air inside the cable junction box A charging unit for charging the DC power rectified through the rectification unit for driving, a ventilation fan installed inside the cable junction box and connected to the charging unit to receive power from the charging unit and ventilate the air inside the cable junction box, ,
The current transformer is composed of a plurality of 'c'-shaped cores arranged in multiple layers in a 'c'-shape, and a bobbin wound around a coil and disposed on each of the plurality of 'c'-shaped cores,
The 'c'-shaped cores are arranged vertically at regular intervals so that one end and the other end face one direction to form a multi-layered structure, and the bobbin is inserted into one end or the other end of each of the 'c'-shaped cores to form a zigzag pattern in the vertical direction. are arranged in an intersecting manner,
A power factor correction unit for compensating the power factor of the output power of the current transformer is further provided between the rectifying unit and the charging unit,
The power factor correction unit includes a coil (L1) having one end connected to the output terminal of the rectifying unit and the other end connected to the input terminal of the charging unit, a resistor (R1) and a capacitor (C2) connected to the other end of the coil (L1), A field effect transistor (FET) Q1 having a drain connected to the other end of the coil L1 and a source connected to ground, and a connection point between the resistor R1 and the capacitor C2 and the field effect transistor (FET) ( A diode (D3) having both ends connected between the drain of Q1) and a thyristor (SCR1) connected in series between the junction of the resistor (R1) and the capacitor (C2) and the gate of the field effect transistor (FET) (Q1) and a resistor R2, a zener diode D4 having one end connected to the gate of the thyristor SCR1 and the other end connected between the connection point between the resistor R1 and the capacitor C2, and the resistor R1 and It consists of a capacitor (C1) connected to the connection point of the capacitor (C2),
The anode of the diode (D3) is connected to the junction of the resistor (R1) and the capacitor (C2) and the cathode is connected to the drain of the field effect transistor (FET) (Q1),
The source of the field effect transistor (FET) (Q1) is connected to ground, the gate is connected to one end of a resistor (R2), the other end of the resistor (R2) is connected to the cathode of the thyristor (SCR1), and the thyristor ( The anode of SCR1) is connected to the connection point of the resistor R1 and the capacitor C2,
The anode of the thyristor (SCR1) is connected to the anode of the zener diode (D4), and the cathode of the thyristor (SCR1) is connected between the junction of the resistor (R1) and the capacitor (C2),
The capacitor (C1) is a self-powered regeneration controller, characterized in that one end is connected to the connection point of the resistor (R1) and the capacitor (C2) and the other end is connected to the ground.
delete delete delete delete According to claim 1,
The rectifying part is composed of a bridge rectifier (D1), and the charging part includes a super capacitor (C3) and a diode (D2).