KR101295586B1 - Standby power-saving apparatus capable of reducing power consumption and standby power based on analyzing signal size of industrial control equipment - Google Patents

Abstract

PURPOSE: A standby power saving device for reducing power consumption and standby power by analyzing a signal size of industrial control equipment is provided to reduce power consumption by making a protective relay use power only when there is any abnormality for protecting a system. CONSTITUTION: A sensing unit (200) senses one signal. A power control unit (210) determines a standby power consumption section of a protective relay which switches the power of a power line based on the sensed signal and controls the power supplied to the protective relay based on a determined result. A control signal generating unit (250) determines a normal signal and an abnormal signal determining the standby power consumption section based on the sensed signal and generates a control signal based on a determined result. A power control driver (260) controls the power supplied to the protective relay based on the control signal. [Reference numerals] (200) Sensing unit; (203) Clamping unit; (205) Filtering unit; (211) Level shifter; (215) Output unit; (217) Signal determination unit; (219) Delay signal output unit; (260) Power control driver

Description

Standby power-saving apparatus capable of reducing power consumption and standby power based on analyzing signal size of industrial control equipment

The present invention relates to a protection relay system including a standby power saving device and the standby power saving device, and more particularly, to a protection relay system including a standby power saving device for reducing standby power and the standby power saving device.

In general, industrial controllers have various types, but most of them receive current (or voltage, temperature, power) signals and output output signals based on the magnitude of the received signals to turn on / off the contacts of the power system. To control the power.

In particular, the protection relay should be instructed to detect an abnormal condition and to cut the part out of the system quickly when a short circuit or ground fault occurs somewhere in the power system or when an abnormal operation occurs that adversely affects the rest of the system. It plays the role of monitoring the current, voltage, etc. of the power line at all times (24 hours) to play a role of shutting off the power system in the event of an error.

That is, the standby power consumption of the protection relay is inevitable because the protection relay must be continuously supplied to monitor the power of the power system at all times (24 hours). Unnecessary standby power consumption of such protective relay is from several watts (watts) to several tens of watts (watts), depending on the equipment, the standby power consumption of the protection relay used for home as well as industrial use is very large.

However, if the protection relay performs the monitoring function only when there is an abnormal symptom without monitoring the power of the power system at all times 24, power consumption may be greatly reduced.

For example, in the operation of an overcurrent relay (OCR) having a rated current of 100 A, a case in which 60% or more of the detection set value of the overcurrent relay is determined as an abnormal symptom of the power system and the power is supplied to the overcurrent relay. By supplying, the power consumed by the overcurrent relay can be greatly reduced.

Therefore, in the present invention, the standby power of the protection relay is a method of reducing the power consumption of the protection relay in a normal line state, thereby reducing power consumption to zero, and supplying power to the protection relay in an abnormal state to perform a detection function. Suggest ways to do this.

It is an object of the present invention to provide a protection relay system including a standby power saving device and a standby power saving device for reducing power consumption and standby power.

In addition, an object of the present invention includes a standby power saving device and the standby power saving device for determining the normal signal and abnormal signal for determining the standby power consumption interval, and controls the power supplied to the protection relay based on the determination result. It is to provide a protective relay system.

The object, according to the present invention, a sensing unit for sensing at least one signal; And

The standby power saving device including a power control unit for determining the standby power consumption interval of the protection relay for opening and closing the power of the power line based on the sensing signal of the sensing unit and for controlling the power supplied to the protection relay based on the determination result. Can be achieved by

The sensing unit may include at least one of a current sensor, a voltage sensor, and a temperature sensor connected to the power line.

The power controller may determine a normal signal and an abnormal signal for determining the standby power consumption interval based on the sensing signal, and control the power supplied to the protection relay based on the determination result.

The power control unit may include: a control signal generator for discriminating the normal signal and the abnormal signal based on the sensing signal and generating a control signal based on a determination result; And a power control driver controlling the power supplied to the protection relay based on the control signal.

The control signal generator may determine an abnormal signal when the magnitude of the sensing signal is larger than a predetermined reference signal and determine a normal signal when the magnitude of the sensing signal is smaller than the predetermined reference signal.

The control signal generator includes: a waveform shaping unit for clamping the magnitude of the sensed signal and filtering noise included in the clamped signal; And a control signal output unit for level shifting the output signal of the waveform shaping unit and delaying the level shifted signal for a predetermined time to generate the control signal.

The waveform shaping unit may include: a clamping unit limiting a magnitude of the sensing signal to a predetermined clamping signal level; And a filtering unit to remove noise included in the output signal of the clamping unit.

The control signal output unit may include: a level shifter for leveling up the output signal of the waveform shaping unit and outputting a leveled up signal; A signal delay unit which determines whether there is an abnormality in the power line based on the output signal of the level shifter, delays the output signal of the level shifter for a predetermined time and buffers the delayed output signal based on a determination result; And an output unit configured to output the control signal having a predetermined voltage level in response to the output signal of the signal delay unit.

The signal delay unit may include a signal determining unit determining whether an abnormality of the power line occurs; And a delay signal output unit configured to delay the output signal of the signal determination unit for a predetermined time and buffer and output the delayed output signal in response to the output signal of the signal determination unit.

The power control driver includes a constant voltage circuit unit for supplying driving power to the protection relay; At least one resistor connected between the constant voltage circuit portion and the control signal generator; A rectifier for rectifying a signal input through the power line and generating a rectified signal; And a relay connected between the rectifying unit and the resistor to cut off power supplied to the protection relay in response to the control signal.

The protection relay may include an over current relay, an over voltage relay, an under voltage relay (UVR), an under current relay, and an earth leakage detector (ELD). , And an earth leakage relay (ELR).

The object, according to the present invention, the protection relay for opening and closing the power supply line; And a standby power saving device for determining a standby power consumption interval of the protection relay based on the sensing signal generated by sensing at least one signal and controlling the power supplied to the protection relay based on the determination result. Can be achieved by the system.

The standby power saving apparatus may include: a sensing unit configured to generate the at least one sensing signal; And it may include a power control unit for controlling the power supplied to the protection relay for opening and closing the power of the power line based on the sensing signal.

The object is, according to the present invention, generating at least one sensing signal; The method may include determining a standby power consumption interval of the protection relay for opening and closing the power of the power line based on the generated sensing signal and controlling the power supplied to the protection relay based on the determination result.

The standby power saving device and the protection relay system including the same to reduce the standby power according to an embodiment of the present invention because the protection relay consumes power only when there is an abnormal sign for 24 hours to protect the system, the protection There is an effect that can greatly reduce the power consumed by the relay.

1 is a block diagram of a protection relay system according to an embodiment of the present invention.
2 is a block diagram of the standby power saving device of FIG.
3 is a circuit diagram of the protection relay system of FIG.
4 is an operation timing diagram of the protection relay system of FIG. 3.
5 is a flowchart illustrating a standby power blocking method of a protection relay according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in order to avoid unnecessary obscuration of the present invention.

Also, in the present specification, when any one element 'transmits (or delivers, transmits) a signal to another element, the element transmits the signal directly to the other element (or provides, (Or delivering, delivering) the data to the other component via at least one other component.

Conversely, when one component 'directly transmits (or provides, transmits)' a signal to another component, the signal is transmitted (or provided) to the other component without passing through another component , Transmission).

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

1 is a configuration diagram of a protection relay system according to an embodiment of the present invention, FIG. 2 is a configuration diagram of the standby power saving device of FIG. 1, and FIG. 3 is a circuit diagram of the protection relay system of FIG. 1. 1 to 3, the protection relay system 10 may include a standby power saving device 20 and a protection relay (or an industrial controller 100).

The standby power saving device 20 determines the standby power consumption period (or power consumption period) of the protection relay 100 based on the sensing signal V1 generated by sensing at least one signal Vi. Based on the determination result, the power supplied to the protection relay 100 may be controlled.

For example, the standby power saving device 20 cuts off the power supplied to the protection relay 100 through the cutoff switch 30 in the standby power consumption section of the protection relay 100 based on the sensing signal V1. In the abnormal signal generation section other than the standby power consumption section, the power supplied to the protection relay 100 may be supplied through the cutoff switch 30.

In general, the function of the protective relay 100 is that a signal larger than its own set value (current, voltage, power, temperature) must be input from the sensor to generate a cutoff output to the setting program.

The standby power saving device 20 determines that the standby power consumption period is lower than a predetermined reference signal (eg, 50% of the leakage current detection set value of the protection relay 100) and supplies the protection relay 100 to the protection relay 100. Can be turned off.

Alternatively, the standby power saving device 20 determines that the standby power is not the standby power consumption period, but the abnormal period in the line state higher than a predetermined reference signal (for example, 50% of the leakage current detection set value of the protection relay 100). Power may be supplied to the relay 100.

The standby power saving device 20 may include a sensing unit 200 and a power control unit 210. The standby power saving device 20 including the sensing unit 200 and the power control unit 210 may be implemented as a system on chip (SOC). In addition, the standby power saving device 20 may be embedded or external to the protection relay 100 to be described later.

On the other hand, in the embodiment of the present invention to the power supply line (L3 and L4) and the protection relay 100 of the main line of the power system to protect the power supply line for supplying power to the protection relay (100) Although divided into power lines (L1 and L2) for supplying power, according to another embodiment of the present invention the power lines (L1 and L2, L3 and L4) are the same (for example, L1 and L3, L2 and L4 Of course, the same power line).

The sensing unit 200 may include at least one of a current sensor, a voltage sensor, and a temperature sensor connected to the power lines L1 and L2.

For example, when the sensing unit 200 is implemented as a current sensor, the sensing unit 200 may be implemented as a current transformer CT, and the current transformers CT and 200 may be any one of power lines L1 and L2. A signal generated from one power line L1 or L2 may be sensed.

In more detail, the sensing unit 200 may sense a signal (and / or current) which is induced electromagnetically from the primary side L1 to the secondary side L2 through the current transformer 200, in which the signal is induced. The size of can be fine.

That is, the standby power saving device 20 according to the embodiment of the present invention uses a secondary organic current induced in the power lines L1 and L2 instead of a separate external power source when determining an abnormal signal, thereby reducing its own power consumption. Few.

More specifically, the standby power saving device 20 uses the semiconductor switch 217 in response to the minute signal, the self-power consumption is close to zero. For example, assuming that the trigger voltage of the semiconductor switch 217 is 0.6V and the detected signal intensity is 10, the self power consumption is 0.000006 watts (W), and the power consumption is almost zero. Can be.

The power control unit 210 may determine the standby power consumption period of the protection relay 100 based on the sensing signal V1 and control the power supplied to the protection relay 100 based on the determination result.

More specifically, the power control unit 210 determines the normal signal and the abnormal signal for determining the standby power consumption interval of the protective relay 100 based on the sensing signal (V1) and based on the determination result and the protective relay The power supplied to 100 may be controlled.

The power control unit 210 may include a control signal generator 250 and a power control driver 260. The control signal generator 250 may determine the standby power consumption interval of the protection relay 100 based on the sensing signal V1 and generate the control signal V6 based on the determination result.

More specifically, the control signal generator 250 determines a normal signal and an abnormal signal for determining a standby power consumption interval of the protection relay 100 based on the sensing signal V1 and based on the determination result. The power supplied to the protection relay 100 may be controlled.

The control signal generator 250 controls the operation of the power control driver 260 that controls the power supplied to the protection relay 100 based on the sensing signal V1 sensed by the sensing unit 200. Control signal V6 may be generated.

The control signal generator 250 may include a waveform shaping unit 201 and a control signal output unit 207. The waveform shaping unit 201 may clamp the magnitude of the sensing signal V1 and filter noise included in the clamped signal. More specifically, the waveform shaping unit 201 clamps up and down electromagnetic waves such as lightning or induced noise generated from the power lines L1 and L2 through the sensing unit 200, and removes noise included in the clamped signal. Can output a formatted signal.

The waveform shaping unit 201 may include a clamping unit 203 and a filtering unit 205. The clamping unit 203 may limit the magnitude of the sensing signal V1 to a predetermined clamping signal level.

Referring to FIG. 3, a circuit diagram of the clamping unit 203 will be described in detail. The clamping unit 203 is connected to at least one of the first node N1 and the second node N2 of the sensing unit 200. Switches (eg, D1, D2, and D3). The at least one switch may be implemented as a diode, and the diode may be implemented as a rectifying diode, a Schottky diode, or a MOS diode.

The first diode D1 and the second diode D2 may be connected between the first node N1 and the second node N2 in a first direction (eg, a forward direction), and the third diode D3. May be connected in a second direction (eg, reverse direction) between the first node N1 and the second node N2.

The clamping unit 203 limits the voltage level of the output signal V2 to the clamping voltage level using at least one diode D1 to D3. Therefore, the voltage level of the output signal V2 of the clamping portion 203 does not exceed the clamping voltage level. That is, according to the exemplary embodiment of the present invention, since the level of the output voltage is limited to the clamp voltage by the clamping unit 203, the level variation of the signal can be reduced.

The filtering unit 205 may remove (or filter) noise included in the output signal V2 of the clamping unit 203, and output the signal V3 from which the noise is removed. For example, the filtering unit 205 may output a standardized signal by removing noise included in the clamped signal V2 such as lightning or induced noise generated from the power lines L1 and L2.

Referring to FIG. 3, the configuration of the filtering unit 205 will be described in detail. The filtering unit 205 includes a first capacitor C1, a first resistor R1, a second resistor R2, and a second capacitor ( C2), a third capacitor C3, a third resistor R3, a fourth capacitor C4, a fourth resistor R4, and a fifth resistor R5.

The first capacitor C1 may be connected between the first node N1 and the second node N2 to charge and discharge a voltage between the first node N1 and the second node N2.

The first resistor R1 may be connected between the first node N1 and the third node N3, and the second resistor R2 may be connected between the second node N2 and the fourth node N4. The second capacitor C2 may be connected between the fourth node N4 and a ground power source to charge and discharge a voltage between the fourth node N4 and the ground power source.

The third capacitor C3 may be connected between the third node N3 and the fourth node N4 to charge and discharge a voltage between the third node N3 and the fourth node N4.

The third resistor R3 is connected between the third node N3 and the fifth node N5, and the fourth capacitor C4 is connected between the third node N3 and the ground power source so that the third node N3 is connected between the third node N3 and the fifth node N5. The voltage between N3 and the ground power source can be charged and discharged. The fourth resistor R4 is connected between the fourth node N4 and the sixth node N6, and the fifth resistor R5 is connected between the sixth node N6 and the first voltage Vcc. Can be connected.

The control signal output unit 207 may level control the output signal V3 of the waveform shaping unit 201 and delay the level shifted signal V4 by a predetermined time to generate the control signal V6.

More specifically, the control signal output unit 207 determines the standby power consumption interval of the protection relay 100 based on the output signal V4 of the level shifter 211 and based on the determination result, the level shifter ( The output signal V4 of 211 may be delayed for a predetermined time, the delayed output signal may be buffered, and the control signal V6 having a predetermined voltage level may be output in response to the buffered signal.

The control signal output unit 207 may include a level shifter 211, a signal delay unit 213, and an output unit 215. The level shifter 211 may level shift the output signal V3 of the waveform shaping unit 201 and output the level shifted signal V4.

For example, the level shifter 211 may level up the output signal V3 of the waveform shaping unit 201 and output the leveled up signal V4. More specifically, the level shifter 211 may output a signal V4 compensated for the DC voltage by compensating a predetermined DC voltage to the output signal V3 of the waveform shaping unit 201.

The signal determination unit 217 of the signal delay unit 213 to be described later may be implemented as a semiconductor switch (eg, a high sensitivity PNPN switch element). In this case, when the input signal V4 of the signal determining unit 217 is weak, the level shifter 211 may compensate for the DC signal because the operation is difficult to fall short of the switching gate voltage (for example, 0.6V). . In this case, the level shifter 211 may determine a pick-up by the magnitude of the DC compensation signal, and the compensation value may be determined by voltage distribution through a variable resistor of the level shifter 211.

For example, the level shifter 211 determines the signal of the signal delay unit 213 when the current of the power lines L1 and L2 has an abnormal magnitude (that is, when the magnitude of the input signal V3 is greater than or equal to a set voltage). The DC signal may be compensated for the input signal V3 so that the compensated signal is applied to the signal determining unit 217 so that a voltage equal to or greater than the trigger voltage is applied to the unit 217. Here, the trigger voltage is a bias voltage applied to trigger the semiconductor switch, and means a minimum voltage value at which the semiconductor switch is operated.

For example, if the level shifter 211 is set to apply a voltage higher than the trigger voltage to the semiconductor switch of the signal determining unit 217 when a few% of the leakage reference voltage set in the protection relay 100 is detected. Alternatively, the DC voltage may be compensated to apply a voltage equal to or greater than the trigger voltage of the semiconductor switch according to a variety of magnitudes of the trigger voltage of the semiconductor switch.

That is, the protection relay system 10 according to the embodiment of the present invention has an effect of adaptively setting the standby power consumption period of the protection relay 100 according to the setting of the level shifter 211. For example, when the user detects a few percent of the lowest set value of the protection relay 100 through setting the variable resistance value of the level shifter 211, the user may set the voltage higher than the trigger voltage by the semiconductor switch of the signal determining unit 217. By setting this to be applied, the standby power consumption interval of the protection relay 100 can be adaptively changed.

The signal delay unit 213 determines the standby power consumption interval based on the output signal V4 of the level shifter 211, and determines the output signal V4 of the level shifter 211 for a predetermined time based on the determination result. The delayed output signal can be buffered and output.

The signal delay unit 213 may include a signal determination unit 217 and a delay signal output unit 219. The signal determining unit 217 may determine the standby power consumption period based on the output signal V4 of the level shifter 211.

The signal determining unit 217 may be implemented as a semiconductor switch (for example, high sensitivity PNPN switch elements Q1 and Q2), and the PNPN switch elements Q1 and Q2 may include a fifth node N5 and a seventh node ( N7) can be connected.

The signal determining unit 217 may be turned on to activate the operation of the delay signal output unit 219 when the input signal V4 exceeds the trigger voltage of the high sensitivity PNPN switch elements Q1 and Q2 with DC compensation.

Meanwhile, the signal determination unit 217 may be implemented by various switches such as FET, SCR, and TRIAC, and may also be implemented as a comparator (not shown). For example, when the signal determining unit 217 is implemented as a comparator (not shown), the comparator (not shown) compares the input signal V4 with a predetermined reference voltage and the input signal V4 is a normal signal or A comparison result for determining whether the signal is an abnormal signal may be output.

For example, when the input signal V4 is smaller than a predetermined reference voltage, the comparator may output a first signal level (eg, a low level or data "0") as a normal signal.

Alternatively, the comparator (not shown) may output a second signal level (eg, a high level or data "1") as an abnormal signal when the input signal V4 is higher than a predetermined reference voltage.

The normal signal and the abnormal signal are signals indicating whether standby power consumption of the protection relay 100 is consumed as described above, and the protection relay system 10 according to an embodiment of the present invention provides the protection relay when the abnormal signal occurs. Power supply 100).

When the comparator (not shown) outputs a second signal level (eg, a high level or data “1”), the operation of the delay signal output unit 219 may be activated.

The delay signal output unit 219 delays the output signal for a predetermined time by charging and discharging the first power voltage Vcc in response to the output signal of the signal determination unit 217 and buffers the delayed output signal. The signal V5 can be output.

The delay signal output unit 219 may include a signal delay 220, a sixth capacitor C6, a sixth resistor R6, and a buffer 221.

The signal delay unit 220 may be connected between the seventh node N7 and the eighth node N8 as an operation time setting module to delay an output signal for a predetermined time by voltage distribution through a variable resistor.

For example, the signal delayer 220 may delay the output signal of the buffer 221 for a predetermined time by controlling the charge / discharge capacity of the sixth capacitor C6 through voltage distribution through a variable resistor.

That is, the protection relay system 10 according to the embodiment of the present invention may variably change the power off time of the protection relay 100 using the signal delay 220.

The sixth capacitor C6 may be connected between the eighth node N8 and a ground power source, and may be charged with a ground voltage through the signal determining unit 217 according to the voltage size of the signal delay unit 220. Can be discharged or a predetermined voltage can be charged.

The sixth resistor R6 may be connected between the eighth node N8 and the first power supply voltage Vcc and based on the voltage magnitude of the signal delayer 220, the sixth capacitor C6. Can charge the voltage.

The buffer 221 may buffer the signal of the eighth node N8 and output the buffered signal. For example, the buffer 221 outputs a first signal level (eg, low level or data “0”) when the signal level of the eighth node N8 is higher than a predetermined reference voltage (eg, 1.4V). When the signal level of the eight node N8 is lower than a predetermined reference voltage (eg, 1.4V), a second signal level (eg, a high level or data “1”) may be output.

The output unit 215 may output the control signal V6 having a predetermined voltage level in response to the output signal V5 of the signal delay unit 219. The output unit 215 may be switched in response to the output signal V5 of the delay signal output unit 219 to turn on the operation of the power control driver 260. The output unit 215 may be implemented by various switches such as FET, SCR, and TRIAC.

The power control driver 260 may control the power supplied to the protection relay 100 in response to the control signal V6 output from the control signal generator 250.

The power control driver 260 corresponds to a portion 40 of FIG. 3, and as shown in FIG. 3, a constant voltage IC 401, at least one resistor R7, a rectifier 405, and a relay 407. ) May be included. The constant voltage IC 401 may be connected between the first voltage Vcc and the ground power supply to supply driving power to the protection relay 100.

The at least one resistor R7 may be connected between the constant voltage IC 401 and the ninth node N9 to minimize power consumed by the protection relay 100. For example, the capacity of the at least one resistor R7 is preferably 10. In this case, the protection relay 100 may be driven at low power by minimizing a current flowing from the first voltage Vcc.

The rectifier 405 may rectify the power applied through the power lines L1 and L2 and generate the rectified power to the relay 407. The rectifier 405 may be implemented as a bridge rectifier circuit.

The relay 407 may be connected between the rectifier 405 and the constant voltage IC 401 to open the contacts of the power lines L1 and L2 in response to the control signal V6. For example, the relay 407 turns on the contacts of the power lines L1 and L2 supplied to the protection relay 100 in response to the control signal V6 when an abnormal signal occurs during the standby power consumption period of the protection relay 100. (Or it can be closed).

Alternatively, the relay 407 may supply power lines L1 and L2 supplied to the protection relay 100 in response to the control signal V6 when an abnormal signal does not occur during the standby power consumption period of the protection relay 100. ) Can be turned off (or open).

The protection relay 100 does not consume power in the standby power consumption section, and generates an electric current flowing through the main lines L3 and L4 of the power system in response to the power supplied by the standby power saving device 20 when an abnormal signal is generated. Can be monitored and blocked.

For example, when the protection relay 100 is not consuming power and 60% leakage current of the detection set value of the protection relay 100 is detected by the standby power saving device 20, the standby power saving device In response to the power supplied by the control of (20), the current flowing in the main lines (L3, L4) of the power system can be cut off the power using the cutoff switch 35 of the main power system.

The protection relay 100 includes an over current relay, an over voltage relay, an under voltage relay (UVR), an under current relay, a power relay, and a power relay. directional relay, an active power relay, and a reactive power relay.

Alternatively, the protection relay 100 may include a directional relay, a directional over current relay (DOCR), a directional over current ground relay (DOCGR), and a differential realy (DCR). , Differential current realy (DCR), ratio differential realy (RDR), differential voltage realy (DVR), voltage restrained over current relay, voltage control overcurrent One of a voltage controlled over current relay and a distance realy.

Alternatively, the protective relay 100 may include an impedance type distance relay, a MHO type distance relay, a reactance type distance relay, an Ohm type distance relay, an off set MHO type distance relay, and a change rate. Relay, negative sequence relay, negative sequence relay, speed relay, temperature relay, pressure relay, short circuit relay, ground relay, interlayer short relay, field relay Any of a loss of field relay, an out-of-stop relay, a system separation relay, an Earth Leakage Detector (ELD), and an Earth Leakage Relay (ELR). Can be.

For example, when the protection relay 100 is implemented as an earth leakage alarm (ELD), the earth leakage alarm (ELD) is a ground fault, a protection device that outputs an alarm and an operation signal when a leakage current exceeding a set current occurs as a leakage current protection relay. As the standby power saving device 20 detects a current of 50% (adjustable) or less than the leakage current set value of the ground fault alarm in the power lines L1 and L2, the power supplied to the ground fault alarm ELD is turned off. You can block.

Alternatively, when the standby power saving device 20 detects a current greater than or equal to 50% of the leakage current setting value of the ground fault alarm in the power lines L1 and L2, power is supplied to the ground fault alarm ELD immediately (within 10 ms). Can be blocked. In this case, since the operation time until the abnormality discrimination output after the power supply of the ground fault alarm is turned ON is within 30 ms, the operation of the ground fault alarm is normal.

On the other hand, the protection relay 100 can secure its own instantaneous interruption power, in this case, the protection relay 100 does not provide instantaneous protection because of the standby power saving device 20 even when the power lines (L1 and L2) are outage for a long time. There is no case.

In addition, when the protection relay 100 does not have its own instantaneous protection power, the protection relay that takes a long time to boot, the standby power saving device 20 according to an embodiment of the present invention because the purpose of the protection relay is not the purpose of instantaneous protection. There is no problem in using the protection relay system 10 including.

4 is an operation timing diagram of the protection relay system of FIG. 3. Referring to FIGS. 3 and 4, assuming that a short circuit has started at a "t3" time point, the level shifter 211 may level up and level up the output signal V3 of the waveform shaping unit 201 at a "t1" time point. The output signal V4 can be output.

The signal delay unit 213 determines whether there is a standby power consumption section based on the output signal V4 of the level shifter 211 at the time “t1”, and outputs the output signal of the level shifter 211 based on the determination result. V4) may be delayed by a predetermined time td, the delayed output signal may be buffered, and the buffered output signal V5 may be output at the time “t2”.

The output unit 215 outputs a control signal V6 having a predetermined voltage level in response to the output signal V5 of the signal delay unit 213 at the time "t3", and the power control driver 260 protects the protective relay. Power can be supplied to 100.

The protection relay 100 may be turned on at a "t3" time point at which a short circuit starts to open the power of the power lines L1 and L2. Meanwhile, since the delay time between the "t2" time point and the "t3" time point is about 10 ms or less, the protection relay 100 may perform a normal short circuit detection function.

5 is a flowchart illustrating a standby power blocking method of a protection relay according to an embodiment of the present invention. 1, 2, and 5, the standby power saving apparatus 20 senses a signal Vi generated from the power lines L1 and L2 (S10), and senses the result of the step S10. Clamping the size of V1 and filtering the noise included in the clamped signal (S20).

The standby power saving device 20 generates a control signal V6 for controlling the operation of the protection relay 100 by level shifting the noise-filtered signal V3 and delaying the level shifted signal by a predetermined time period. In response to the generated control signal V6, the power supplied to the protection relay 100 is controlled (S30).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

10: Protection relay system
20: standby power saving device
L1, L2, L3, L4: Power Line
100: protective relay

Claims (14)

A sensing unit for sensing at least one signal; And
And a power controller configured to determine a standby power consumption period of the protection relay for opening and closing the power of the power line based on the sensing signal of the sensing unit, and controlling the power supplied to the protection relay based on the determination result.
The power control unit,
A control signal generator which determines a normal signal and an abnormal signal for determining the standby power consumption interval based on the sensing signal, and generates a control signal based on the determination result; And
It includes a power control driver for controlling the power supplied to the protection relay based on the control signal,
The control signal generator,
A waveform shaping unit for clamping the magnitude of the sensing signal and filtering noise included in the clamped signal; And
And a control signal output unit for level shifting the output signal of the waveform shaping unit and delaying the level shifted signal to generate the control signal. The apparatus of claim 1, wherein the sensing unit comprises:
Standby power saving device comprising at least any one of a current sensor, a voltage sensor, and a temperature sensor connected to the power line. The method of claim 1, wherein the power control unit,
And a normal signal and an abnormal signal for determining the standby power consumption interval based on the sensing signal, and controlling the power supplied to the protection relay based on the determination result. delete The method of claim 1, wherein the control signal generator,
And determine the abnormal signal when the magnitude of the sensing signal is greater than a predetermined reference signal, and determine the normal signal when the magnitude of the sensing signal is smaller than the reference signal. delete The method of claim 1, wherein the waveform shaping unit,
A clamping unit configured to limit the magnitude of the sensing signal to a predetermined clamping signal level; And
Standby power saving device including a filtering unit for removing the noise contained in the output signal of the clamping unit. The method of claim 1, wherein the control signal output unit,
A level shifter for leveling up the output signal of the waveform shaping unit and outputting the leveled up signal;
A signal delay unit which determines whether there is an abnormality in the power line based on the output signal of the level shifter, delays the output signal of the level shifter by a predetermined time based on the determination result, and buffers the delayed output signal; And
And an output unit configured to output the control signal having a predetermined voltage level in response to an output signal of the signal delay unit. The method of claim 8, wherein the signal delay unit,
A signal determining unit determining whether the power line is abnormal; And
And a delay signal output unit configured to delay an output signal of the signal determination unit for a predetermined time in response to an output signal of the signal determination unit and buffer and output the delayed output signal. The method of claim 1, wherein the power control driver,
A constant voltage circuit unit for supplying driving power to the protection relay;
At least one resistor connected between the constant voltage circuit portion and the control signal generator;
A rectifier for rectifying a signal input through the power line and generating the rectified signal; And
And a relay connected between the rectifier and the resistor to cut off power supplied to the protection relay in response to the control signal. The method of claim 1, wherein the protective relay,
Over current relay, over voltage relay, under voltage relay (UVR), under current relay, Earth Leakage Detector (ELD), and earth leakage relay ( Standby power saving device which is one of Earth Leakage Relay (ELR). A protection relay for opening and closing the power supply line; And
A sensing unit generating a sensing signal by sensing at least one signal, and determining a standby power consumption interval of the protection relay based on the sensing signal, and controlling power supplied to the protection relay based on the determination result. Including a standby power saving device including a power control unit,
The power control unit,
A control signal generator which determines a normal signal and an abnormal signal for determining the standby power consumption interval based on the sensing signal, and generates a control signal based on the determination result; And
It includes a power control driver for controlling the power supplied to the protection relay based on the control signal,
The control signal generator,
A waveform shaping unit for clamping the magnitude of the sensing signal and filtering noise included in the clamped signal; And
And a control signal output unit for level shifting the output signal of the waveform shaping unit and delaying the level shifted signal to generate the control signal. delete Generating at least one sensing signal in a sensing unit of the standby power saving apparatus; And
The power control unit of the standby power saving device determines the standby power consumption interval of the protection relay for opening and closing the power of the power line based on the sensing signal, and controls the power supplied to the protection relay based on the determination result. Including steps
Controlling the power source,
Determining, by the control signal generator of the power control unit, a normal signal and an abnormal signal for determining the standby power consumption interval based on the sensing signal, and generating a control signal based on the determination result; And
In the power control driver of the power control unit, controlling the power supplied to the protection relay based on the control signal,
Generating the control signal,
In the waveform shaping unit of the control signal generator, clamping the magnitude of the sensing signal and filtering noise included in the clamped signal; And
And at the control signal output unit of the control signal generator, level shifting the output signal of the waveform shaping unit, and delaying the level shifted signal to generate the control signal.

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