KR102322283B1 - Digital protective relay equipment for a pole transformer - Google Patents

Abstract

The present invention relates to a digital protection relay device. According to an embodiment of the present invention, the digital protection relay device comprises: a detection unit configured to detect an AC voltage of a power distribution line and supply it to a pole transformer; and a relay controller configured to primarily sample the AC voltage transformed through the pole transformer by a preset period unit and check the magnitude of the primarily sampled AC voltage by the preset period unit to generate a stabilization signal for phase modulation of the transformed AC voltage, thereby increasing management efficiency of electric devices such as power distribution lines, switches, switchgears and the like and protection relay devices.

Description

DIGITAL PROTECTIVE RELAY EQUIPMENT FOR A POLE TRANSFORMER

The present invention relates to a digital protection relay device for a pole transformer that can maintain a stable state while stabilizing power supply and demand of a distribution line by checking the amount of power of a distribution line and the power usage characteristics of consumers in real time.

In order to supply the grid power of a power plant to consumers through substations, etc., a switchboard, a switchboard, and a distribution board are used.

In order to supply electricity from a substation to a customer, the switchboard is installed in each customer and controls the distribution system, and is a device that distributes, opens, closes, safety, and measures electricity. is composed by

A distribution board or a switchboard is also configured with a circuit breaker, a protection relay, etc. to receive and distribute power from the substation.

The protection relay, which is essential in the distribution line that supplies power to consumers, monitors the power supply and demand status of the consumers or distribution lines by measuring the voltage, current, etc. And when an accident such as a short circuit or a ground fault occurs, the circuit breaker is controlled to selectively separate the faulty line from the sound distribution line.

The conventional protection relay is configured to include a buzzer or an LED display device for an alarm together with a switch in order to monitor the power supply and demand status of the distribution line and to alarm whether there is an abnormality. Accordingly, the manager was able to find the control board or LED display device of the protection relay, check the amount of electricity in the distribution line (eg, voltage, current, wattage, frequency, etc.), and determine whether there is any abnormality. However, the conventional protection relay only displays the power supply and demand status, and when a problem occurs, the response is accompanied by the inconvenience of having to be directly performed by the manager.

Therefore, by detecting the voltage and current of the distribution line, the voltage level and current amount are calculated in real time, and the calculation result is compared with the preset reference voltage level or current amount information to detect and automatically cut off the overvoltage or overcurrent of the distribution line. A digital protection relay with an improved function has also been disclosed.

However, conventional protection relays do not take into account the power use characteristics of consumers who receive power from the distribution line, and simply detect changes in the amount of voltage and current supplied to the distribution line to perform the blocking operation. There is a problem in that the functionality is reduced. .

Since consumers who supply and receive electricity from distribution lines are diverse, such as factories, industrial devices, power storage devices, public housing, industrial complexes, agricultural and industrial complexes, etc., the power usage characteristics of the consumers are also diverse. Nevertheless, if the blocking operation is performed by simply detecting changes in the amount of voltage and current supplied to the distribution line, the use and management efficiency of the protective relay is inevitably reduced. For example, when power usage characteristics are rapidly changed in industrial load devices or high-capacity batteries driven by high voltage, various control devices connected to the distribution line, including protective relays and switchgear, are affected by the rapidly changing power characteristics. As the degree of variation in the power characteristics of the distribution line increases, the control devices may be damaged or damaged. Therefore, a countermeasure is needed.

The present invention is to solve the above-mentioned problems, to accurately check the amount of power of the distribution line and the power usage characteristics of consumers, and to quickly stabilize the power supply and demand of the distribution line even if the amount of power distribution and power usage characteristics change rapidly while maintaining a stable state. An object of the present invention is to provide a digital protection relay device for a pole-phase transformer.

Digital protection relay device for a pole transformer according to an embodiment of the present invention for solving the above problems is a detection unit for detecting the AC voltage of a distribution line and supplying it to the pole transformer, and the AC voltage transformed through the pole transformer for a preset period and a relay controller for generating a stabilization signal for phase modulation of the transformed AC voltage by performing primary sampling in units and checking the magnitude of the primary sampled AC voltage in units of a preset period.

The relay controller of the present invention sets the reference sampling number or reference sampling frequency in a preset period unit, and first samples the AC voltage transformed in the pole-phase transformer according to the reference sampling number or the reference sampling frequency, and is applied to the reference sampling number or frequency. It is stored as a reference voltage value according to the corresponding reference voltage value, and a stabilization signal for the phase modulation is generated according to the reference voltage value and the voltage value to be first sampled.

The digital protection relay device for a pole transformer according to an embodiment of the present invention enables to accurately monitor the amount of power of the distribution line and the power usage characteristics of consumers in real time, thereby protecting the electrical devices including the switch or switch including the distribution line and the like. It is possible to increase the management efficiency of the relay device.

In addition, the digital protection relay device for a pole transformer according to an embodiment of the present invention rapidly stabilizes the power supply and demand of the distribution line even when the distribution power amount and power usage characteristics of the distribution line change rapidly, and by maintaining a stable state, management personnel and management costs It is possible to further improve the management efficiency of power distribution equipment or electric devices.

1 is a block diagram showing a digital protection relay device for a pole transformer according to an embodiment of the present invention.
2 is a block diagram showing a subdivided structure of the relay controller of the digital protection relay device.
3 is a block diagram showing the structure of the phase modulator of the relay control unit.
4 is a waveform diagram illustrating a distribution voltage phase modulation method of a phase modulator.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Hereinafter, a digital protection relay device for a pole transformer according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The digital protection relay device according to an embodiment of the present invention may be collectively referred to as a power management unit, a power meter, and the like, in addition to the protection relay.

1 is a block diagram showing a digital protection relay device for a pole transformer according to an embodiment of the present invention.

The digital protection relay device shown in FIG. 1 includes an insulating connection unit 110 , a detection unit 100 , a relay controller 300 , an output sensor 400 , and a relay display unit 500 .

The insulated connection unit 110 detects a voltage of an EFT test power line or a distribution line connected to grid power. The insulating connection part 100 may include at least one shunt resistor device connected in series or in parallel to the distribution line. In addition, the insulating connection part 100 may further include a stabilization circuit for stabilizing the shunt resistor element, a heat dissipation element, and the like. Alternatively, the insulating connection unit 100 may be configured to include at least one of a current transformer (CT) and a potential transformer (PT).

The detection unit 100 amplifies the AC voltage of the distribution line detected by the insulated connection unit 100 and transmits the amplified voltage to the pole transformer 200 . Specifically, the detection unit 100 is configured between the distribution line and the pole transformer 200 so that the distribution line and the pole transformer 200 are not directly electrically connected, but insulated or conducted as necessary.

The detection unit 100 may be configured to include at least one amplifier (Isolation Amplifier). Accordingly, the detection unit 100 amplifies the AC voltage from the distribution line to a preset rated voltage or a reference voltage level, and transmits the amplified AC voltage to the pole transformer 200 . By amplifying and converting the AC voltage from the detector 100 to at least one amplifier, the magnitude of the DC voltage or the magnitude of the AC voltage can be easily changed in the column-phase transformer 200 .

The pole transformer 200 converts the AC voltage detected and amplified by the detection unit 100 into a DC voltage of a preset size according to the control of the relay controller 300 and supplies it to the relay display unit 500 and the relay controller 300 and , the converted DC voltage may be supplied to the consumer or load devices of the consumer through the output sensor 400 .

In addition, the pole transformer 200 reduces and transforms the AC voltage detected and amplified by the detection unit 100 according to the control of the relay controller 300 to a rated voltage according to the consumer or load devices of the consumer, and the output detector 400 Stable supply to consumers or their subordinate devices through

The relay controller 300 first samples the AC voltage transformed to the rated voltage in the pole-phase transformer 200 in units of a preset period. In addition, by monitoring the magnitude of the primary sampled AC voltage in units of a preset period, it is determined whether a surge voltage or impulse noise, which is compared to the reference voltage, is input according to a change in the magnitude of the AC voltage. To this end, the relay controller 300 may be configured to include an MCU (Micro Controller Unit) including a microprocessor, etc. in addition to at least one AD converter and a ballast.

The relay controller 300 sets the reference sampling number or reference sampling frequency, etc. in a preset period unit, and first samples the AC voltage converted to the rated voltage in the pole-phase transformer 200 according to the reference sampling number or the reference sampling frequency. can do. In addition, the average value of the detection voltage values for each sampling timing according to the reference sampling number or frequency may be stored as a reference voltage value and displayed on the relay display unit 500 .

When the difference between the reference voltage value and the voltage value initially sampled in real time becomes greater than the preset offset reference value, the relay controller 300 determines that overvoltage or surge voltage is input or impulse noise is input to generate a stabilization signal. can

On the other hand, the relay controller 300 is outputted to the output terminal of the output sensor 400 and secondly samples the AC voltage supplied to the consumer or the load devices of the consumer in units of a preset period. And, by comparing the magnitude of the secondary sampled AC voltage with the magnitude of the primary sampled AC voltage, it is possible to determine the voltage and current amount change characteristics according to the load period of the consumer or the customer according to the change in the magnitude of the secondary sampled AC voltage. can The relay controller 300 will be described in more detail later with reference to the accompanying drawings.

The relay display unit 500 includes at least one monitor and an alarm speaker, and the sampling timing and sampling number variable state input from the relay controller 300 according to the control of the relay controller 300 , and detection of surge voltage or impulse noise The monitor screen and alarm speaker indicate whether or not it is stable according to the uninterruptible power supply status.

FIG. 2 is a block diagram showing the subdivision of the relay controller structure of the digital protection relay device shown in FIG. 1 .

The relay controller 300 shown in FIG. 2 includes at least one divider 301 , a resistance value modulation unit 302 , a rated power supply unit 304 , an MCU ( 303 , Micro Controller Unit), and a phase modulation unit 305 . include

The divider 301 first samples the AC voltage transformed and distributed to the rated voltage in the pole transformer 200 in a preset period unit, and the AC voltage output to the output terminal of the output detector 400 is also preset for a preset period and period Secondary sampling is performed by changing the unit.

The resistance value modulator 302 varies the resistance value and the capacitance value of the RC circuits according to the control of the MCU 303, and the output sensor 400 against the AC voltage of the pole transformer 200 output through each RC circuit. The phase of the AC voltage of the output stage is detected by a comparator.

The MCU 303 controls the sampling period of the divider 301 , compares the secondary sampled AC voltage values with the primary sampled AC voltage values, and generates a stabilization signal according to a preset offset reference value. At this time, the MCU 303 divides the secondary-sampled AC voltage values by voltage values sampled at the current timing compared to the voltage values sampled at the previous timing, compares them sequentially, and generates a stabilization signal according to a preset offset reference value. can

Specifically, the MCU 303 sets the number or sampling frequency of the AC voltage supplied to the consumer or load devices of the consumer by varying the sampling frequency in a preset period and period unit. In addition, the second sampling may be performed by varying the sampling timing through the divider 301 according to the changed number of sampling or the sampling frequency. In addition, the MCU 303 sequentially compares the AC voltage values sampled secondarily with the AC voltage values sampled first with each other by varying it for each preset period and period. At this time, if the difference between the secondary sampled AC voltage values and the primary sampled AC voltage values becomes greater than the preset offset reference value, it is determined that overvoltage or surge voltage is input or impulse noise is input, and a stabilization signal can be generated. .

The MCU 303 varies the sampling number or sampling frequency in units of a preset period and period to secondary sampling the AC voltage supplied to the consumer or the load devices of the consumer, so that the AC voltage supplied to the consumer or the load devices of the consumer can widen the detection range and increase stability.

In addition, the MCU 303 varies the sampling timing according to the varied sampling number or sampling frequency to classify the secondary-sampled AC voltage values by voltage values sampled at the current timing compared to the voltage values sampled at the previous timing, and sequentially each other. can be compared. Accordingly, when the difference between the AC voltage value sampled at the previous timing and the AC voltage value sampled at the current timing is greater than the preset offset reference value, the MCU 303 determines that overvoltage, surge voltage, or impulse noise has been input and provides a stabilization signal can cause

The MCU 303 generates a stabilization signal, thereby controlling the timing of the phase modulation operation of the phase modulator 305 and the output terminal of the AC voltage and the output detector 400 transformed in the pole transformer 200 through the relay display unit 500 . Indicates whether the phase synchronization of the AC voltage supplied from the to the consumer and the transition of the stabilization state are made.

The phase modulator 305 controls the rated power supply unit 304, etc. to modulate and synchronize the phase of the AC voltage transformed in the pole-phase transformer 200 and the AC voltage supplied from the output terminal of the output sensor 400 to the consumer, The power supplied to the device is converted into an uninterrupted state for a predetermined period of time.

Specifically, the phase modulator 305 varies the phase of the AC voltage supplied from the output terminal of the output detector 400 to the consumer according to the phase of the AC voltage transformed by the column-phase transformer 200, thereby increasing the power supplied to the consumer. It can be temporarily converted to an uninterrupted state. At this time, the phase modulator 305 controls the resistance value of the rated power supply unit 304 or the switching of the inverter according to the phase of the AC voltage transformed in the column-phase transformer 200 or the phase of the AC voltage supplied to the consumer, thereby the output sensor An output timing or a switching operation of power output to the output terminal of 400 may be controlled.

FIG. 3 is a structural block diagram showing a subdivided structure of the phase modulator shown in FIG. 2 . 4 is a waveform diagram illustrating a distribution voltage phase modulation method of the phase modulator.

Referring to FIG. 3 , the phase modulator 305 includes a phase detection unit 310 , a switching control unit 320 , a power distribution control unit 330 , a synchronization unit 350 , and a synchronization control unit 360 .

Specifically, when the stabilization signal is generated, the switching control unit 320 enables the phase detection unit 310 to obtain the phase of the AC voltage V1 transformed in the pole-phase transformer 200 and the AC output to the output terminal of the output detector 400 . The phase difference information Ts of the voltage V2 is detected.

3 and 4, the phase detection unit 310 is a phase difference between the phase of the AC voltage V1 transformed in the pole-phase transformer 200 and the AC voltage V2 output to the output terminal of the output detector 400 ( The phase difference signal according to Ts) is detected. Accordingly, phase difference information between the phase of the AC voltage V1 transformed by the pole-phase transformer 200 and the AC voltage V2 output to the output terminal of the output sensor 400 is generated.

Specifically, the AC voltage V1 of the pole transformer 200 and the AC voltage V2 of the output terminal of the output detector 400 may have different pulse widths through different RC circuits, respectively, and pass through different RC circuits. The AC voltage of one pole transformer 200 and the AC voltage of the output terminal of the output sensor 400 may be compared with each other through the comparator of the resistance value modulator 302 .

To the comparator of the resistance value modulator 302 , a phase difference signal whose pulse width is modulated according to the same or different phases is output, and the phase detection unit 310 is a phase difference signal of the resistance value modulator 302 . Phase difference information (Ts, phase difference period information) is generated according to the pulse width or phase for .

When the stabilization signal is generated, the synchronization control unit 360 controls the synchronizer 350 to control the phase of the AC voltage V1 transformed in the pole-phase transformer 200 and the AC voltage V2 output to the output terminal of the output detector 400 . To synchronize the phases of the output terminal of the output detector 400 to be in an uninterrupted state.

Specifically, the synchronization control unit 360 is output to the output terminal of the phase or output detector 400 of the AC voltage (V1) transformed in the pole-phase transformer 200 in accordance with the phase difference information (Ts) from the phase detection unit 310 By delay outputting the phase of the AC voltage V2, the phase of the AC voltage V1 transformed in the column-phase transformer 200 and the phase of the AC voltage V2 output to the output terminal of the output sensor 400 are synchronized.

To this end, the synchronization control unit 360 sets and applies the inverter switching pulse value of the synchronization unit 350 so as to be synchronized with the phase difference information Ts from the phase detection unit 310 , and passes through the inverter of the synchronization unit 350 . The phase of the AC voltage V1 of the pole-phase transformer 200 or the AC voltage V2 output to the output terminal of the output sensor 400 is delayed by the inverter output. In addition to the inverter, the phase of the AC voltage V1 of the pole-phase transformer 200 or the AC voltage V2 output to the output terminal of the output detector 400 may be delayed through a logic circuit such as a delay flip-flop.

The synchronization unit 350 responds to the inverter switching pulse value input through the synchronization control unit 232 of the AC voltage (V1) of the pole-phase transformer 200 or the AC voltage (V2) output to the output terminal of the output detector (400) Output with a phase delay.

The amplitude (Va) of the AC voltage (V2) output to the output terminal of the output sensor 400 compared to the AC voltage (V1) of the pole transformer 200 remains the same, but the phase will be different by the phase difference information (Ts) can Accordingly, the synchronization unit 350 delays the output timing of the AC voltage V1 of the pole transformer 200 or the AC voltage V2 output to the output terminal of the output detector 400 according to the inverter switching pulse value, thereby, the pole transformer The phase of the AC voltage V1 of 200 or the AC voltage V2 output to the output terminal of the output sensor 400 is delayed.

In this way, the phase of the AC voltage V1 of the pole transformer 200 or the AC voltage V2 output to the output terminal of the output sensor 400 is delayed by the synchronization unit 350, so that the AC of the pole transformer 200 is delayed. The phase of the voltage V1 and the AC voltage V2 output to the output terminal of the output sensor 400 may be synchronized to maintain the uninterrupted state.

The relay display unit 500 compares the phase with respect to the AC voltage V1 of the pole-phase transformer 200 with the voltage and current phases output through the synchronization unit 350, and displays the comparison result on a monitor in real time.

Accordingly, the relay display unit 500 compares and displays the output phase for the AC voltage V1 of the pole-phase transformer 200 and the output phase for the output terminal AC voltage V2 of the phase-modulated output sensor 400, Monitoring accuracy and management efficiency can be further improved.

As described above, the digital protection relay device according to an embodiment of the present invention enables to accurately monitor the amount of power of the distribution line and the power usage characteristics of consumers in real time, thereby protecting the electrical devices including the switch or switch including the distribution line and the like. It is possible to increase the management efficiency of the relay device.

In addition, the digital protection relay device according to the embodiment of the present invention rapidly stabilizes the power supply and demand of the distribution line even when the distribution power amount and power usage characteristics of the distribution line change rapidly, and by maintaining a stable state, by reducing management personnel and management costs, the distribution device I can further improve the management efficiency of electric devices.

In the above, the present invention has been shown and described in relation to a specific preferred embodiment, but the present invention is variously modified and changed without departing from the technical features or field of the present invention provided by the following claims. It will be apparent to one of ordinary skill in the art that

110: insulating connection
100: detection unit
200: pole transformer
300: relay controller
400: output sensor
500: relay display

Claims (6)

an insulating connection unit 110 configured to include at least one shunt resistor device connected to a distribution line, a stabilization circuit stabilizing the shunt resistor device, and a heat dissipation device for detecting a voltage;
a detection unit 100 amplifying the voltage detected in the insulating connection unit and supplying it to the pole transformer;
The AC voltage transformed and distributed to the rated voltage in the pole transformer 200 is first sampled in units of a preset period, and the AC voltage output to the output terminal of the output detector 400 is also varied in units of a preset period and period 2 At least one divider 301 for differential sampling, the resistance value and capacitance value of the RC circuits are varied according to the control of the MCU 303, and the AC voltage vs. output sensor of the pole transformer 200 that is output through each RC circuit (400) the resistance value modulation unit 302 for detecting the AC voltage phase of the output terminal with a comparator, the rated power supply unit 304, the number or sampling frequency of the AC voltage supplied to the consumer or load devices of the consumer for a preset period and The second sampling is performed by varying the sampling timing through the divider 301 according to the changed number of sampling or the sampling frequency, and the second sampling is performed by varying the second sampled AC voltage values by a preset period and period. When the difference between the secondary sampled AC voltage values and the primary sampled AC voltage values by sequentially comparing the primary sampled AC voltage values with each other becomes greater than the preset offset reference value, overvoltage or surge voltage is input or impulse noise is generated. It includes an MCU (Micro Controller Unit) 303, a phase detection unit 310, a switching control unit 320, a power distribution control unit 330, a synchronization unit 350, and a synchronization control unit 360 that determines that it is input and generates a stabilization signal. By controlling the resistance value of the rated power supply unit 304 or the switching of the inverter according to the phase of the AC voltage supplied to the consumer or the phase of the AC voltage transformed in the columnar transformer 200, the output terminal of the output detector 400 a relay controller 300 configured to include a phase modulator 305 capable of controlling an output timing or switching operation of output power;
The AC voltage detected and amplified by the detection unit 100 under the control of the relay controller 300 is converted into a DC voltage of a preset size and supplied to the relay display unit 500 and the relay controller 300, and the converted DC voltage is a pole transformer 200 that can be supplied to a consumer or a load device of the consumer through the output sensor 400;
and at least one monitor and an alarm speaker, according to the control of the relay controller 300, the sampling timing and sampling number inputted from the relay controller 300 variable state, whether surge voltage or impulse noise is detected, uninterruptible power supply state Comprising a relay display unit 500 for displaying whether the stabilization according to the monitor screen and the alarm speaker,
Digital protective relay for pole transformers.
delete delete delete The method of claim 1,
The relay controller is
The voltage values of the secondary sampled AC voltage are divided into voltage values sampled at the current timing compared to the voltage values sampled at the previous timing, and the phase modulation is performed according to the comparison result sequentially compared with each other and a preset offset reference value. generating a stabilization signal,
Digital protective relay for pole transformers.

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