KR100817115B1 - Digital protection relay having a alarm sound device - Google Patents

Abstract

The present invention relates to a digital protection relay that can be connected to a state detection unit that detects and outputs a power system normal state signal. In particular, an alarm according to the occurrence of an abnormal state of the power system and an alarm according to the continuation of the abnormal state for a predetermined time or more, respectively An input unit connected to the state detection unit to receive another sound and to receive and provide the state signal; Connected to the input unit, determining that an abnormality of the power system occurs when the state signal is equal to or greater than a preset reference value, and controlling to emit a first sound alarm, wherein a state in which the state signal is equal to or greater than a preset reference value is preset; A control unit which determines that an accident has occurred in the power system when the reference time period continues for more than a reference time, and outputs a second acoustic alarm different from the first acoustic alarm; It is connected to the control unit to alert the user by distinguishing the occurrence of an abnormality and the occurrence of an accident into different sound signals, and according to the emission control of the first or second sound alarm, different first or second sound alarms are generated. It is to provide a digital protective relay having a sound alarm device consisting of; and a sound control unit for outputting.

Digital protection relay, acoustic alarm, sound source

Description

DIGITAL PROTECTION RELAY HAVING A ALARM SOUND DEVICE

1 is a block diagram showing a configuration of a conventional digital protective relay having an acoustic alarm device.

Figure 2 is a block diagram showing the configuration of a digital protective relay having an acoustic alarm device according to the present invention.

3 is a block diagram separately illustrating a configuration of an acoustic controller of a digital protective relay according to an embodiment of the present invention.

Figure 4 is a block diagram showing the configuration of the sound control unit and the D / A converter 9 of the digital protection relay according to another embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

1: digital protection relay 2: state detection unit

3: input unit 4: control unit

5: digital output section 6: buzzer circuit section

7: sound control unit 7-1: sound source selection circuit unit

7-2: sound source storage unit 7-3: speaker

7-4: Amplification Control Unit 8: Display Section

9: D / A converter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital protection relay, and more particularly, to a digital protection relay capable of alerting each other with a different sound in the event of an abnormal state of a power system and the occurrence of an abnormal state for a predetermined time or longer.

In general, a digital protective relay (also called a digital motor protective relay) is installed between a power system (power system in the power generation and distribution stage), that is, between a power supply side and a load device (normal motor), to monitor the state of the power system and the load device. As a device for monitoring and protection, it alarms it in case of abnormality or accident of power system or load device, and outputs a signal to drive control to cut off the connected circuit breaker to cut off the circuit between power system and load device to cut off the power system and load. Protect your device.

On the other hand, it will be described with reference to Figure 1 attached to an example of a digital protection relay according to the prior art that detects the state of the power system or load device and alerts it when an accident occurs.

1 is a block diagram showing the configuration of a conventional digital protective relay having an acoustic alarm device.

In FIG. 1, the digital protective relay 1 includes an input unit 3, a control unit 4, a digital output unit 5, a speaker 6, and a display unit 8. The external state detection unit 2 connected to the digital protective relay 1 is a means for detecting a state of a power system or a state of a load device. For example, a current transformer for detecting and providing a current in the power system, And a potential transformer for detecting and providing a voltage on the power system.

The input unit 3 is connected to the state detecting unit 2 to receive a state signal from the state detecting unit 2, and although not shown, the input unit 3 has a low frequency for removing high frequency noise among the received state signals. And a filter circuit section, a multiplexer circuit section for multiplexing, and an A / D converter circuit section for converting and providing a received analog signal into a digital signal.

The control unit 4 is connected to the input unit 3, and may be specifically configured as a microprocessor, and thus, a central processing unit for integrated control and calculation, and a series of processing programs. It may be configured to include a ROM (Read Only Memory) for storing the memory and a RAM (Random Access Memory) for temporarily storing the operation results.

The digital output unit 5 has an input connected to the control unit 4 and an output connected to a circuit breaker connected to the outside of the digital protective relay 1, and according to the control of the control unit 4, for example, the control unit 4. ) Outputs a control signal for commanding the shutoff operation of the external circuit breaker, and accordingly outputs a shutoff drive signal (aka TRIP drive signal) to the external circuit breaker.

The buzzer circuit section 6 has an input connected to the control section 4, and is composed of a buzzer, an amplifier and a speaker not shown, and when an accident state such as over current or low current occurs in the power system, The buzzer sounds according to the control signal of A and amplifies it to the amplifier and outputs through the speaker to alert the administrator to the accident.

The display unit 8 is connected to the control unit 4, and according to the display control signal from the control unit 4, the state of the power system or load device provided by the input unit 3, that is, current, voltage or temperature, abnormality For example, a liquid crystal display, a light emitting device, or the like, which displays status information of whether or not the display device is displayed, may be configured.

Referring to the operation of the digital protection relay 1 according to the prior art configured as described above is as follows.

When the current, voltage or temperature of the power system or load device is detected from the state detection unit 2 and received as a state signal, the input unit 3 provides the received state signal to the control unit 4.

When the state signal is input from the input unit 3, the control unit 4 displays the value of the state signal on the display unit 8, and the control unit 4 previously processes the program stored in a program storage means such as a ROM. Read and compare the preset reference value (voltage, current or temperature) with the input state signal according to the processing program, and if the input state signal is equal to or greater than the preset reference value, it is determined that an abnormality has occurred in the power system.

The control unit 4 measures the elapsed time from the moment when an abnormality occurs in the power system according to time information from a clock means such as a system clock, not shown, and the elapsed time lasts longer than a time set in advance in the processing program. If it is, that is, if the abnormal state persists, it is determined that an accident occurs, and if it is determined that an accident occurs, the output control to alarm the buzzer circuit unit 6 to alert the administrator.

At the same time, the control unit 4 outputs a control signal for instructing the block drive to the digital output unit 5 to cut off the circuit of the power system in which an accident occurs, and thus the digital output unit 5 trips to an external circuit breaker. By outputting the driving signal, the circuit is cut off to protect the power system and the load device.

However, since the digital protective relay according to the prior art does not emit an acoustic alarm at the time of an abnormal occurrence and emits an acoustic alarm only after a considerably long time elapsed time from the abnormal occurrence until the determination of the occurrence of the accident, the administrator There is a problem that only the facts of an accident can be known and that an opportunity to prepare for an accident in advance is not given.

Therefore, the present invention was devised in view of the above problems, and it is possible to output an acoustic alarm of an abnormal state before an accident occurs, and can alarm each other with a different sound for an abnormal state occurrence and an accident occurrence. Another object of the present invention is to provide a digital protective relay having an acoustic alarm device capable of distinguishing an alarm from an abnormality of a load device and an occurrence of an accident.

An object of the present invention as described above, in the digital protection relay which can be connected to the state detection unit for detecting and outputting the state signal of the power system or the load device,

An input unit connectable to the state detection unit, the input unit receiving and providing the state signal from the state detection unit;

Connected to the input unit, determining that an abnormality of the power system occurs when the state signal is equal to or greater than a preset reference value, and controlling to emit a first sound alarm, wherein a state in which the state signal is equal to or greater than a preset reference value is preset; A control unit which determines that an accident has occurred in the power system when the reference time period continues for more than a reference time, and controls to emit a second acoustic alarm different from the first acoustic alarm;

It is connected to the control unit to alert the user by dividing the occurrence of an abnormality and the occurrence of an accident into different sound signals, and according to the emission control of the first or second sound alarm of the control unit, different first or second sounds. It can be achieved by providing a digital protective relay having a sound alarm device according to the invention characterized in that it comprises a; and a sound control unit for outputting an alarm.

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

2 is a block diagram showing a configuration of a digital protection relay having an acoustic alarm device according to the present invention, and FIG. 3 is a digital protection device according to an embodiment of the present invention. FIG. 4 is a block diagram illustrating a configuration of an acoustic controller separately among relays, and FIG. 4 is a block diagram illustrating a configuration of an acoustic controller and a D / A converter 9 among digital protection relays according to another embodiment of the present invention.

In FIG. 2, the digital protective relay 1 according to the present invention comprises an input unit 3, a control unit 4, a digital output unit 5, an acoustic control unit 7 and a display unit 8 do. The external state detection unit 2 connected to the digital protective relay 1 is a means for detecting a state of a power system or a state of a load device. For example, a current transformer for detecting and providing a current in the power system, Potential transformers or voltage divider circuits that detect and provide voltages in the power system, and temperature sensors installed in the rotor or transformer of the motor and measuring the temperature of the rotor or the transformer and providing them as electrical signals. .

The input unit 3 is connected to the state detecting unit 2 to receive a state signal from the state detecting unit 2, and although not shown, the input unit 3 receives high frequency noise among the received state signals as in the prior art. And a low frequency filter circuit unit for removing, a multiplexer circuit unit for multiplexing, and an A / D converter circuit unit for converting and providing a received analog signal into a digital signal.

The control unit 4 is connected to the input unit 3, and may be specifically configured as a microprocessor, and thus, a central processing unit for integrated control and calculation, and a series of processing programs. It may be configured to include a ROM (Read Only Memory) for storing the memory and a RAM (Random Access Memory) for temporarily storing the operation results.

The control unit 4 determines that an abnormality of the power system occurs when the state signal from the input unit 3 is equal to or greater than a preset reference value using the program, and emits a first sound alarm, that is, the first sound alarm. Outputs an acoustic alarm control signal and determines that an accident has occurred in the power system when the state signal is equal to or greater than a preset reference value for more than a preset reference time and emits a second acoustic alarm; Output alarm trigger control signal. Here, the first and second acoustic alarm emission control signals are digital signals having different digital values.

The digital output unit 5 has an input connected to the control unit 4 and an output connected to a circuit breaker (not shown) connected to the outside of the digital protective relay 1, and according to the control of the control unit 4, for example. When the control unit 4 outputs a control signal for commanding the shutoff operation of the external circuit breaker, accordingly, the control unit 4 outputs a shutoff drive signal (aka TRIP driving signal) to the external circuit breaker.

The sound control unit 7 is connected to the control unit 4 so as to alert the user by distinguishing an abnormal occurrence and an accident occurrence into different sound signals and issuing a first or second sound alarm of the control unit 4. According to the control, different first or second acoustic alarms are output.

The display unit 8 is connected to the control unit 4, and according to the display control signal from the control unit 4, the state of the power system or load device provided by the input unit 3, that is, current, voltage or temperature, abnormality For example, a liquid crystal display (LCD), a light emitting device (light emitting device), and the like, which display status information of whether or not may be configured.

Meanwhile, a detailed configuration of the sound control unit 7 will be described with reference to FIG. 3.

The sound control unit 7 may include a sound source storage unit 7-2 storing at least two different sound sources so as to alarm the abnormal occurrence and the accident occurrence with different sounds according to an embodiment of the present invention. ; A sound source selection circuit unit 7-1 for selecting and outputting a corresponding sound source among sound sources stored in the sound source storage unit 7-2 according to the emission control of the sound alarm from the control unit 4; And a speaker 7-3 for outputting an acoustic alarm to the sound source selected and output by the sound source selection circuit unit 7-1. Here, an amplifier circuit may be provided at the front end of the speaker 7-3 to amplify the sound.

According to another embodiment of the present invention, the sound control unit according to another embodiment of the present invention for alarming the occurrence of the abnormality and the occurrence of the accident in different sounds, and by the type of accident, the sound source for the abnormality alarm and the type of the accident A sound source storage unit 7-2 for storing alarm sounds for different accident types; A sound source selection circuit unit 7-1 for selecting and outputting a corresponding sound source among sound sources stored in the sound source storage unit 7-2 according to the emission control of the sound alarm from the control unit 4; And a speaker 7-3 for outputting an acoustic alarm to the sound source selected and output by the sound source selection circuit unit 7-1.

Here, an amplifier circuit may be provided at the front end of the speaker 7-3 to amplify the sound.

According to another embodiment of the present invention, the digital protection relay of the present invention converts the first and second acoustic alarm emission control signals having different digital values from the controller 4 into analog signals corresponding thereto. (9), wherein the sound control unit (7) includes: a sound source storage unit (7-2) for storing at least two different sound sources different from each other so as to alert the abnormal occurrence and the occurrence of an accident with different sounds; Sound source selection for selecting and outputting a sound source among sound sources stored in the sound source storage unit 7-2 according to the emission control of the sound alarm from the control unit 4, that is, the first and second sound alarm emission control signals. A circuit portion 7-1; A speaker (7-3) for outputting an acoustic alarm to the sound source selected and output by the sound source selection circuit section (7-1); Connected between the speaker 7-3 and the sound source storage unit 7-2 and to the D / A converter 9, more specifically in accordance with the analog signal from the D / A converter 9; And an amplification control unit 7-4 which adjusts and outputs a sound volume of the sound source selected by the sound source selection circuit unit 7-1 according to the amount of electricity of the analog signal.

According to the amount of electricity of the analog signal, the sound source selection circuit unit 7-1 adjusts and outputs the sound volume of the selected sound source according to the electric quantity of the analog signal. -1) means amplifying correspondingly the sound level of the selected sound source. That is, for example, a small sound at the start and then amplified to a loud sound after 3 seconds.

The sound control unit 7 according to the embodiment is characterized in that the sound for alarming the abnormal occurrence and the sound alarming the occurrence of a different configuration, the characteristic of the sound control unit 7 according to the other embodiment The sound is configured differently for each accident (overcurrent, low current, overvoltage, overheat, etc.) as well as the alarm sound and the alarm sound of an accident. A characteristic of the digital protection relay according to another embodiment is that the first sound alarm emission control signal of the controller 4 for alarming an abnormal occurrence and the second sound alarm emission control signal of the control part 4 for alarming an accident are different from each other. By utilizing the point having a digital value, this feature is converted into an analog signal feature to give a distinctive feature to the sound alarm.

The operation of the digital protective relay 1 according to the present invention configured as described above is as follows.

When the current, voltage or temperature of the power system or load device is detected from the state detection unit 2 and received as a state signal, the input unit 3 provides the received state signal to the control unit 4.

When the state signal is input from the input unit 3, the control unit 4 displays the value of the state signal on the display unit 8, and the control unit 4 previously processes the program stored in a program storage means such as a ROM. Reads and compares the preset reference value (voltage, current or temperature) with the input status signal according to the processing program, and if the input status signal is greater than or equal to the preset reference value (if under voltage is less than or equal to the set reference value), In order to determine that an abnormality has occurred in the power system and alert the administrator, an emission control, that is, a first sound alarm emission control signal, is outputted to alert the acoustic controller 7 of an abnormal condition occurrence.

Accordingly, the sound source selection circuit unit 7-1 of the sound control unit 7 selects and outputs the corresponding sound source preset by the program in the sound source storage unit (7-2) for the alarm of the abnormal state, and accordingly The speaker 7-3 alarms the sound of the corresponding sound source to alert the administrator that an error has occurred and to be prepared.

The control unit 4 measures the elapsed time from the moment when an abnormality occurs in the power system according to time information from a clock means such as a system clock, not shown, and the elapsed time lasts longer than a time set in advance in the processing program. If the abnormal state persists, it is determined that an accident has occurred, and if it is determined that an accident has occurred, an alarm is issued to the sound control unit 7 to alert the administrator, that is, a second sound alarm emission control signal. Outputs

Accordingly, the sound source selection circuit unit 7-1 of the sound control unit 7 selects and outputs the corresponding sound source preset by the program in the sound source storage unit (7-2) for the alarm of the accident state, and accordingly, The speaker 7-3 alarms the sound of the corresponding sound source and alerts the administrator to take a corresponding action because an accident has occurred.

Here, in the case of the configuration according to the other embodiment, the control unit 4 using the sound source 2 in the case of an overcurrent accident, for example, in the case of an overcurrent accident (sound source 3 in the case of low current, sound source 4 in the case of motor overheat) Alarm output control signal to the sound control unit 7 so as to alert the user using the sound source 5 in case of overheating of the transformer, and in response thereto, the sound source selection circuit unit 7-1 of the sound control unit 7 has an overcurrent accident state. The sound source 2 is selected from the sound source storage unit ((7-2) for the alarm of the sound source, and the speaker 7-3 outputs the sound of the sound source 2 to the manager so that an overcurrent accident has occurred to the manager. Alert you to take appropriate action.

In the configuration according to another embodiment, the controller 4 determines that an abnormality has occurred in the power system when the input state signal is greater than or equal to a preset reference value (or less than or equal to the preset reference value when the voltage is low). In order to alert the manager, an emission control, that is, a first sound alarm emission control signal, is output to alert the sound control unit 7 of an abnormal state occurrence. In addition, the control unit 4 measures the elapsed time from the moment when an abnormality occurs in the power system, and if this elapsed time lasts longer than a predetermined time in the processing program, that is, if the abnormal state persists, this is caused by an accident. If it is determined that an accident has occurred, an alarm is issued to the acoustic controller 7, that is, a second sound alarm emission control signal is output to alert the administrator. The first sound alarm emission control signal and the second sound alarm emission control signal output by the controller 4 have different digital values, and the D / A converter 9 connected corresponding to the digital values of these signals is analog. Convert it to a signal and output it. Then, the amplification control unit 7-4 in the sound control unit 7 according to another embodiment adjusts the sound volume of the sound source selected by the sound source selection circuit unit 7-1 and outputs it through the speaker 7-3. By doing so, the alarm of the abnormal state occurrence and the alarm of the occurrence of the accident through the speaker 7-3 are known to the manager as a sound having a different characteristic in accordance with different sounds and times.

As described in detail above, the present invention provides a digital protection relay that can sound an alarm to the administrator in the event of an abnormal condition before advancing to the occurrence of the accident in the digital protection relay to prepare in advance before the accident of the power system or load equipment It can work.

In addition, the present invention can not only alarm the abnormal state and the accident state with a different sound in the digital protective relay, but also by different sounds for each accident, the administrator can distinguish between the abnormal state and the accident state to deal with In other words, it has the effect of being able to quickly recognize and respond to the kinds of accidents.

In addition, there is no separate circuit configuration in the digital protection relay of the buzzer circuit unit as in the prior art, and can be configured using a microprocessor constituting the existing control unit, and the output contact to the buzzer circuit unit is also unnecessary. Cost can also be reduced.

Claims (8)

A digital protective relay that can be connected to a state detection unit that detects and outputs a state signal of a power system or a load device, An input unit connectable to the state detection unit, the input unit receiving and providing the state signal from the state detection unit; Connected to the input unit, determining that an abnormality of the power system occurs when the state signal is equal to or greater than a preset reference value, and controlling to emit a first sound alarm, wherein a state in which the state signal is equal to or greater than a preset reference value is preset; A control unit which determines that an accident has occurred in the power system when the reference time period continues for more than a reference time, and controls to emit a second acoustic alarm different from the first acoustic alarm; It is connected to the control unit to alert the user by dividing the occurrence of an abnormality and the occurrence of an accident into different sound signals, and according to the emission control of the first or second sound alarm of the control unit, different first or second sounds. A sound control unit for outputting an alarm, wherein the sound control unit is a sound source storage unit for storing at least two different sound sources, in order to alarm the occurrence of the abnormality and the occurrence of an accident, and the emission control of the sound alarm from the control unit The sound control unit may include a sound source selection circuit unit for selecting and outputting a corresponding sound source among the sound sources stored in the sound source storage unit, and a speaker configured to output a sound alarm for the sound source selected and output by the sound source selection circuit unit. Digital protection relay with an acoustic alarm device, characterized in that the. The digital protection relay as claimed in claim 1, wherein the input unit receives and provides a state signal for a detection current of a power system from the state detection unit. The digital protection relay as claimed in claim 1, wherein the input unit receives and provides a state signal for a detected voltage on a power system from the state detection unit. The digital protective relay as claimed in claim 1, wherein the input unit receives and provides a state signal for a power system normal from the state detection unit or a detected temperature of a load device. delete A digital protective relay that can be connected to a state detection unit that detects and outputs a state signal of a power system or a load device, An input unit connectable to the state detection unit, the input unit receiving and providing the state signal from the state detection unit; Connected to the input unit, determining that an abnormality of the power system occurs when the state signal is equal to or greater than a preset reference value, and controlling to emit a first sound alarm, wherein a state in which the state signal is equal to or greater than a preset reference value is preset; A control unit which determines that an accident has occurred in the power system when the reference time period continues for more than a reference time, and controls to emit a second acoustic alarm different from the first acoustic alarm; It is connected to the control unit to alert the user by dividing the occurrence of an abnormality and the occurrence of an accident into different sound signals, and according to the emission control of the first or second sound alarm of the control unit, different first or second sounds. A sound control unit for outputting an alarm, wherein the sound control unit alarms the abnormal occurrence and the occurrence of the accident with different sounds, and also for each type of the accident to alarm with different sounds, the sound source for the abnormal occurrence alarm and the different accidents by the type of the accident A sound source storage unit for storing a sound source for each type of alarm, a sound source selection circuit unit for selecting and outputting a corresponding sound source among sound sources stored in the sound source storage unit according to the emission control of the sound alarm from the controller, and the sound source selection circuit unit A sound control unit comprising a speaker for outputting a sound alarm to the sound source is selected and output by the; A digital protective relay comprises an acoustic alarm device, characterized in that the. A digital protective relay that can be connected to a state detection unit that detects and outputs a state signal of a power system or a load device, An input unit connectable to the state detection unit, the input unit receiving and providing the state signal from the state detection unit; A first sound alarm emission control signal having a first digital value connected to the input unit and configured to determine that an abnormality of the power system occurs when the state signal is equal to or greater than a preset reference value and to control to emit a first sound alarm. And a second sound different from the first sound alarm which determines that an accident has occurred in the power system and emits a second sound alarm when a state in which the state signal is equal to or greater than a preset reference value lasts more than a preset reference time. A control unit for outputting a second acoustic alarm emission control signal having a digital value of; A D / A conversion unit connected to the control unit for converting first and second sound alarm emission control signals from the control unit into analog signals and outputting the analog signals; A first sound alarm emission control signal and a first sound alarm control signal connected to the control unit for controlling an occurrence of an abnormality and an accident occurrence by using different sound signals to alert the user. And a sound controller for separately outputting different first or second sound alarms according to the sound alarm output control signal and the analog signal from the D / A converter. Digital protective relay. The method of claim 7, wherein the sound control unit, A sound source storage unit for storing at least two different sound sources so as to alert the abnormal occurrence and the occurrence of an accident with different sounds; A sound source selection circuit unit for selecting and outputting a corresponding sound source among sound sources stored in the sound source storage unit according to the first or second sound alarm emission control signal from the controller; A speaker for outputting an acoustic alarm to the sound source selected and output by the sound source selection circuit unit; Connected between the sound source storage unit and the speaker and also connected to an output of the D / A converter, so as to change the loudness of the sound source selected by the sound source selector circuit according to the change of the analog signal output from the D / A converter. An amplification controller for amplifying correspondingly; Digital protective relay with an acoustic alarm device, characterized in that consisting of.

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