KR20010016899A - Digital auto reclosing relay - Google Patents

Abstract

PURPOSE: A digital reclosing relay is provided to accumulate or initialize the total number of the reclosing by selectively outputting a main transformer automatic voltage regulating stopping signal, a reclosing signal, an overcurrent relay trip preventing signal, a relay interior error alarming signal, and reclosing failure alarming signals. CONSTITUTION: A synchronization detecting signal, a manual lock signal, an interrupter pressure signal, a contact signal of an overcurrent relay, a reclosing device on/off switch signal, and an interrupter contacting signal are inputted to an input end of a microprocessor(17) via photo couplers(11-16) and buffers(B1-B6) to recognize the exterior operation state. A watch dock timer(18), a nonvolatile memory, and the microprocessor(17) connected to a ROM(20) and a RAM(21) transfers the preliminary time through a first dip switch, the restarting time through a second dip switch, a waiting time through a third dip switch, a first reclosing time through a fourth dip switch, a secondary reclosing time through a fifth dip switch, and a third reclosing time through a sixth dip switch via buffer ICs(22). The microprocessor(17) outputs a control signal. The microprocessor selectively outputs a main transformer automatic voltage regulating stopping signal, a reclosing signal, an overcurrent relay trip preventing signal, a relay interior error alarming signal, and reclosing failure alarming signals.

Description

Digital reclosing relay {Digital auto reclosing relay}

The present invention relates to a digital reclosing relay used for transmission and distribution lines of 154KV or less. In particular, a microprocessor, a calculation function, and an analog / digital converter are built in, and a non-switch method is adopted in addition to the output contact, so that the maximum reload per cycle A digital reclosing relay that can be closed up to three times and has a function of a pass each time, allowing the success or failure of reclosing, the state of readiness, external synchronization conditions, and the accumulation and resetting of the total number of reclosing. will be.

In general, the power supplied through the transmission and distribution lines of 154KV or less should always be constant, but the current value is changed by the circumstances of the substation or the power consumption of the customer, as well as the abnormal state of the line. It is already well known that V will greatly affect the next load of home or industrial equipment.

In the related art, a transformer (1) for converting a signal suitable for a relay by inputting a three-phase current and an image voltage as shown in FIG.

A low pass filter (2) for filtering the output signal of the transformer (1) to prevent aliasing;

A sampling and holding unit 3 for sampling and maintaining each signal for synchronization through the low pass filter 2,

A multiplexer 4 for selecting and outputting the held signals output from the sampling and holding unit 3 one by one;

An analog / digital converter 5 for converting an analog signal output from the multiplexer 4 into a digital signal and outputting the digital signal;

A microprocessor 6 which performs a blocking operation by performing a protection operation on the digitally converted value through the analog / digital converter 5;

Trip contact point 7 for blocking the line by the interruption output output from the microprocessor 6, and

By configuring the selective ground relay with the display and correction units 8 which display the operation state or the operation value setting by the output of the microprocessor 6,

A first step of obtaining a three-phase current and an image voltage phaser and comparing whether the root mean square (Vo) value of the image voltage is greater than the operating value from the phaser;

A second step of calculating an unbalance correction coefficient of the current transformer by determining that the Vo is not larger than the operating value in the first step, in which there is no ground fault;

If Vo is larger than the operating value in the first step, it is determined that the ground fault is caused by the image voltage, and the three-phase current and the image voltage are calculated using the uncompensated correction coefficient obtained in the second step. A fourth step of determining a section;

In the fourth step, only the pure fault current is detected by the fifth steps of blocking and generating a trap output by the breaker to determine the fault section so that the correct fault section can be blocked.

However, according to the conventional selective ground relay as described above, since the transformer 1, such as a current transformer, installed in order to accurately detect current and voltage values according to abnormality of the distribution line, is an electrical device such as a coil type, the induced voltage is distributed during an accident. In addition to the main body that is a protective relay through the line to cause a breakdown, there was a disadvantage that the breaker is completely cut off by a transient overcurrent in the transformer 1, not a permanent failure, affecting the supply and demand of power.

Accordingly, the present invention has a microprocessor, arithmetic function, and an analog-to-digital converter, and employs a non-switch method in addition to the output contact, which allows a maximum number of recloses per cycle up to three times, and has a function of a pass each time. Its purpose is to provide a digital reclosing relay that allows the accumulation or resetting of the success or failure of reclosing or the state of readiness, external synchronization conditions, and the total number of reclosing.

In order to achieve the above object, the present invention provides a photocoupler in which a synchronous detection signal, a manual lock signal, a breaker pressure signal, an overcurrent relay contact signal, a recloser on / off switch signal, and a breaker contact signal are respectively optoelectronic devices. Applied to the light emitting diode,

The collector of the phototransistor of the photocoupler, which is the optoelectronic device, is connected to the input terminal of the microprocessor to recognize the input state of the signal.

The microprocessor receives a pulse from a watchdog timer to match synchronization or count time in internal operation.

The microprocessor stores the operation state or the user's setting value including the number of reclosing in the nonvolatile memory and outputs the result.

The microprocessor that controls the internal operation by the method input to the ROM to temporarily store the information input and output to the RAM,

The microprocessor includes a preparation time (PT) through a first dip switch, a restart time (RT) through a second dip switch, a wait time (WT) through a third dip switch, and a primary reclosing through a fourth dip switch. Time (T1), Second Reclosing Time (T2) via Fifth Dip Switch, Third Reclosing Time (T3) via Sixth Dip Switch, Count Reset Switch, Normal / Lock Switch, Test Switch, Microprocessor Re Receive inputs from set switches and reset switches via a buffer.

The microprocessor outputs a control signal to selectively turn on a plurality of operation display light emitting diodes through a buffer, and then displays the numerical values according to the operation on the display unit through the 7-segment driving unit.

The microprocessor determines the normality according to the external input signal input through the photo transistor of the photo coupler and the condition input by the user through the first to sixth dip switches, and automatically adjusts the peripheral voltage through the buffer. Optionally output stop signal, reclosing signal, instantaneous overcurrent relay trip prevention signal, relay internal error alarm signal and reclosing failure alarm signal. It has the function of, and can accumulate or initialize the success or failure of reclosing, the state of preparation, external synchronization condition, and the total number of reclosing.

1 is a block diagram schematically showing a configuration of a conventional overvoltage / undervoltage relay.

Figure 2 is a block diagram showing the overall configuration of the present invention.

Figure 3 is a front view showing the configuration of the front plate of the present invention.

4 is a flow chart showing the operation of the present invention.

* Explanation of Signs of Major Parts of Drawings *

1: Transformer 11 ~ 16: Photo Coupler as Optoelectronic Device

17: microprocessor 18: watchdog timer

19: nonvolatile memory

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

Figure 2 is a block diagram showing the overall configuration of the present invention, Figure 3 shows the configuration of the front plate,

The synchronous detection signal SYNC from the outside is applied to the light emitting diode LED1 of the photo coupler 11 which is an optoelectronic device,

Passive lock signal (M.LOCK) is applied to the light emitting diode (LED2) of the photo coupler 12 which is an optoelectronic device,

The breaker pressure signal (CB -Pres) is applied to the light emitting diode (LED3) of the photo coupler 13, which is an optoelectronic device,

The contact signal PROT.-RY of the overcurrent relay is applied to the light emitting diode LED4 of the photo coupler 14, which is an optoelectronic device.

The recloser on / off switch signal (REC-ON / OFF) is applied to the light emitting diode (LED5) of the photo coupler 15, which is an optoelectronic device,

The circuit breaker contact signal CB is applied to the light emitting diode LED6 of the photo coupler 16 which is an optoelectronic device.

In the collectors of the photo transistors PT1 to PT6 of the photo couplers 11 to 16 which are the optoelectronic devices, signals are connected to the input terminals of the microprocessor 17 via the buffers B1 to B6, respectively. To recognize the input status,

The microprocessor 17 receives a pulse from the watchdog timer 18 for synchronizing synchronization or counting time in an internal operation.

The microprocessor 17 stores the state of the operation or the user's setting value including the number of reclosing in the nonvolatile memory 19 and outputs the result.

The microprocessor 17 which controls the internal operation by the method input to the ROM 20 to temporarily store the information input and output to the RAM 21,

The microprocessor 17 has a preparation time through a first dip switch DSW1, a restart time through a second dip switch DSW2, and a standby time through a third dip switch DSW3. (Waiting Time), the first reclose time (T1) through the fourth dip switch (DSW4), the second reclose time (T2) through the fifth dip switch (DSW5), through the sixth dip switch (DSW6) Input by the third reclose time T3, count reset switch SW1, normal / lock switch SW2, test switch SW3, microprocessor reset switch SW4 and reset switch SW5 Receive via the buffer IC (22).

The microprocessor 17 outputs a control signal and outputs a plurality of operation display light emitting diodes LED7, LED8, LED8, LED10, LED11, LED12, LED13, and LED14 through a buffer IC 23. Selective lighting of auxiliary power supply, confirmation of success of reclosing, confirmation of failure of reclosing, status of readiness, confirmation of external synchronous condition, reclosing confirmation once per cycle, reclosing confirmation twice per cycle and At the same time, it is possible to know reclosing confirmation, etc. three times per one cycle, and then again displays the numerical value according to the operation on the display unit 25 via the 7-segment driving unit 24,

The microprocessor is normally operated according to an external input signal selectively input through the photo couplers 11 to 16 and a condition input by the user through the first to sixth dip switches DSW1 to DSW6. After determining whether or not, the peripheral voltage of the automatic voltage adjustment stop signal, re-closing signal, instantaneous over-current relay trip prevention signal, relay internal error alarm signal and re-closure failure alarm signal are selectively output through the buffer IC (26). will be.

The state in which the digital reclosing relay of the present invention configured as described above operates is described in detail with reference to the flowchart of FIG. 4.

Synchronous detection signal SYNC, manual lock signal (M.LOCK), breaker pressure signal (CB-Pres) and recloser on / off switch signal (REC-ON / OFF) are all set to "H" from the outside. When lighted while being applied to the light emitting diodes LED1, LED2, LED3, and LED5 of the photocouplers 11, 12, 13, and 15, which are optoelectronic devices, the phototransistors PT1, PT2, PT3 Since the (PT5) are turned on and the collector-emitter is turned on, the signal is changed to "L" in the microprocessor 17 connected to the input terminal through the buffers B1, B2, B3, and B5, respectively. Recognize the input (step 31).

If the above synchronous detection signal (SYNC), manual lock signal (M.LOCK), breaker pressure signal (CB-Pres) and recloser on / off switch signal (REC-ON / OFF) are all input to "L" In the microprocessor 17, the contact signal PROT.-RY of the overcurrent relay is applied to the light emitting diode LED4 of the photocoupler 14, which is an optoelectronic device, as “H”, thereby turning on the photo transistor PT4. The conduction of the emitter causes the collector to recognize whether the contact of the relay has been operated in the state where the input terminal is changed to "L" through the buffer B4 (step 32).

When the contact point of the relay is activated, the breaker contact signal CB is applied to the light emitting diode LED6 of the photo coupler 16 which is a photoelectric element as " H " By this, the collector recognizes whether the contact of the breaker is closed in the state where the input terminal is changed to "L" through the buffer B6 (step 33).

When the contact point of the breaker is closed, the microprocessor 17 non-volatile the first reclose time T1 input through the fourth dip switch DSW4 while receiving time information from the watchdog timer 18. Read from memory 19 (step 34) ??

At the time of reset, the photo-detector PT1 is turned on while the light-emitting diode LED1 of the photo coupler 11 is turned on with the synchronous detection signal SYNC "H" from the outside. Then, the microprocessor 17 connected to the collector via the buffer B1 recognizes the input of the synchronization detection signal SYNC in a state of changing to "L" (step 35).

When the synchronous detection signal SYNC is inputted, the microprocessor 17 turns on the operation display light emitting diode LED8 (LED12) through the buffer IC 23 and confirms success of reclosing and once per cycle. The first reclose signal is output through the buffer IC 26 while allowing the reclose confirmation to be known (step 36).

The microprocessor 17 then stores the state of operation including the number of reclosing or the user's setting value in the nonvolatile memory 19 (step 37).

During the reclosing, the contact signal PROT.-RY of the overcurrent relay is applied to the light emitting diode LED4 and the phototransistor PT4 of the photo coupler 14, which are optoelectronic devices, or the breaker contact signal CB is applied. Check whether the light-emitting diode (LED6) and the photo transistor (PT6) of the photocoupler 16, which is an optoelectronic device, is applied in a state of informing that the breaker is closed (step 38). Reduce to (step 39).

In step 32, the contact signal PROT.-RY of the overcurrent relay is not applied to the light emitting diode LED4 and the photo transistor PT4 of the photo coupler 14, which is an optoelectronic device, or the breaker contact signal CB in step 33. If the circuit breaker is not applied in the closed state, the microprocessor 17 performs self-diagnosis and then returns to the initial state (step 40).

If the contact of the relay is activated by the contact signal (PROT.-RY) of the overcurrent relay in step 38 above and the contact of the breaker is closed by the breaker contact signal (CB), the second reclosing state is determined. Recognize (step 41).

The microprocessor 17 reads the second reclose time T2 input through the fifth dip switch DSW5 from the nonvolatile memory 19 while receiving time information from the watchdog timer 18 ( Step 42).

At the time of reset, the photo-detector PT1 is turned on while the light-emitting diode LED1 of the photo coupler 11 is turned on with the synchronous detection signal SYNC "H" from the outside. Then, the microprocessor 17 connected to the collector via the buffer B1 recognizes the input of the synchronization detection signal SYNC in a state of changing to "L" (step 43).

When the synchronous detection signal SYNC is input, the microprocessor 17 checks the success of reclosing and turns on twice during one cycle while lighting the operation display light emitting diode LED8 (LED13) through the buffer IC 23. The second reclose signal is output through the buffer IC 26 while allowing the reclose confirmation to be known (step 44).

The microprocessor 17 then stores the state of operation including the number of reclosing or the user's setting in the nonvolatile memory 19 (step 45).

During the reclosing, the contact signal PROT.-RY of the overcurrent relay is applied to the light emitting diode LED4 and the phototransistor PT4 of the photo coupler 14, which are optoelectronic devices, or the breaker contact signal CB is applied. It is checked whether the light is applied to the light emitting diode LED6 and the photo transistor PT6 of the photo coupler 16, which is an optoelectronic device (step 46).

If the contact of the relay is operated by the contact signal (PROT.-RY) of the overcurrent relay in step 46 above and the contact of the breaker is closed by the breaker contact signal (CB), the third reclosing state is determined. Recognize (step 47).

The microprocessor 17 reads the third reclosing time T3 inputted through the sixth dip switch DSW5 from the nonvolatile memory 19 while receiving time information from the watchdog timer 18 ( Step 48).

At the time of reset, the photo-detector PT1 is turned on while the light-emitting diode LED1 of the photo coupler 11 is turned on with the synchronous detection signal SYNC "H" from the outside. Then, the microprocessor 17 connected to the collector via the buffer B1 recognizes the input of the synchronization detection signal SYNC in a state of changing to "L" (step 49).

When the synchronous detection signal SYNC is input, the microprocessor 17 lights up the operation display light emitting diode LED8 (LED14) through the buffer IC 23, and confirms success of reclosing and three times per cycle. At the same time, the reclose confirmation is acknowledged, and a third reclose signal is output through the buffer IC 26 (step 50).

The microprocessor 17 then stores the state of operation including the number of times of reclosing or the user's setting value in the nonvolatile memory 19 (step 51).

During the reclosing, the contact signal PROT.-RY of the overcurrent relay is applied to the light emitting diode LED4 and the phototransistor PT4 of the photo coupler 14, which are optoelectronic devices, or the breaker contact signal CB is applied. It is checked whether the light is applied to the light emitting diode LED6 and the photo transistor PT6 of the photo coupler 16, which is an optoelectronic device (step 52).

If there is no signal input in operation in steps 31, 35, 43, 47, and 49 above, the relay is reclosed (step 53), and whether there is an input of the reset switch SW5 manually. If it is confirmed (step 54), the process returns to step 39 to perform the reset operation and then to restore the initial stage.

Therefore, in the digital reclosing relay of the present invention, a synchronous detection signal, a manual lock signal, a breaker pressure signal, an overcurrent relay contact signal, a recloser on / off switch signal, and a breaker contact signal are input to the microprocessor via an optoelectronic device. Make sure,

The above microprocessor which processes information using watchdog timer, non-volatile memory, ROM, and RAM is connected to a count initialization switch, a normal / lock switch, a test switch, a microprocessor reset switch, and a reset switch. Get information of preparation time, restart time, waiting time, first reclosing time, second reclosing time, and third reclosing time (T3) through DIP switch,

The microprocessor displays a plurality of operation display light emitting diodes and an operation state on the display unit, and determines whether or not normal operation, and thus the peripheral voltage automatic voltage regulation stop signal, reclosing signal, instantaneous overcurrent relay trip prevention signal, and relay internal error alarm. By selectively outputting the signal for redistribution and reclosing failure alarm, the maximum number of reclosing per cycle is possible up to three times, and it has the function of pass each time, and the status of success or failure of reclosing or preparation, external synchronization The total number of conditions and reclosing can be accumulated or initialized.

Claims (2)

Synchronous detection signal (SYNC), manual lock signal (M.LOCK), breaker pressure signal (CB-Pres), contact signal (PROT.-RY) of overcurrent relay, recloser on / off switch signal (REC-) ON / OFF) and the circuit breaker contact signal CB are inputted to the input terminal of the microprocessor 17 via the photocouplers 11 to 16 and the buffers B1 to B6, which are optoelectronic devices, respectively. To recognize the operating state of, The microprocessor 17 connected to the watchdog timer 18, the nonvolatile memory 19, the ROM 20, and the RAM 21 may include a preparation time through a first dip switch DSW1, a second dip switch ( Restart time through DSW2), standby time through third dipswitch DSW3, primary reclosing time T1 through fourth dipswitch DSW4, secondary reclosing through fifth dipswitch DSW5 Time (T2), 3rd reclosing time (T3), 6th dip switch (DSW6), count reset switch (SW1), normal / lock switch (SW2), test switch (SW3), microprocessor reset switch ( The input of SW4) and the reset switches SW5 are received via the buffer IC 22. The microprocessor 17 outputs a control signal and outputs a plurality of operation display light emitting diodes LED7, LED8, LED8, LED10, LED11, LED12, LED13, and LED14 through a buffer IC 23. Selective lighting of auxiliary power supply, confirmation of success of reclosing, confirmation of failure of reclosing, status of readiness, confirmation of external synchronous condition, reclosing confirmation once per cycle, reclosing confirmation twice per cycle and The number is displayed on the display unit 25 via the reclosing confirmation and the 7-segment driving unit 24 three times per cycle, The microprocessor determines whether it is normal according to the external input signal and the user's input condition. The buffer IC 26 stops the automatic voltage regulation stop signal, the reclose signal, the instantaneous overcurrent relay trip prevention signal, and the relay internal error. Digital reclosing relay, characterized in that configured to selectively output the alarm signal and re-closure failure alarm signal. Recognizing whether the synchronous detection signal (SYNC), the manual lock signal (M.LOCK), the breaker pressure signal (CB-Pres) and the recloser on / off switch signal (REC-ON / OFF) are input from the outside. Wow, Recognizing whether the contact point of the relay has been operated; Recognizing whether the breaker contact signal CB is in a closed state of the breaker; Reading the first reclosing time T1 from the nonvolatile memory 19 while receiving time information from the watchdog timer 18, By recognizing the input of the synchronous detection signal SYNC, the LED for operation display LED8 (LED12) is turned on, so that the confirmation of success of reclosing and confirmation of reclosing once per cycle is carried out through the buffer IC 26. To output a signal to the first reclosing step, The contact signal (PROT.-RY) or the breaker contact signal (CB) of the overcurrent relay is applied during reclosing while storing the state of the operation including the number of recloses or the user's set value in the nonvolatile memory 19. Checking the value or otherwise performing a reset and returning to an initial state, If the contact of the relay is operated by the contact signal (PROT.-RY) of the overcurrent relay and the contact of the breaker is closed by the breaker contact signal (CB), recognizing whether or not the second reclose state is present; Reading the second reclosing time T2 from the nonvolatile memory 19, If it is inputted by recognizing whether or not the synchronous detection signal SYNC is input, it is confirmed through the operation display light emitting diode LED8 (LED13) and the reclosing success twice per cycle and through the buffer IC 26. Outputting a signal to the second reclosing step, If the contact signal (PROT.-RY) or the breaker contact signal (CB) of the overcurrent relay is not applied during reclosing while storing the operating state or the user's set value including the number of recloses in the nonvolatile memory 19. Performing a reset, If the contact signal PROT.-RY of the overcurrent relay is applied and the contact point of the breaker is closed by the breaker contact signal CB, recognizing whether the third reclosed state is present; Reading the third reclosing time (T3) from the nonvolatile memory (19), When the synchronous detection signal SYNC is input, the third reclosing signal is outputted while acknowledging the success confirmation of reclosing and reclosing confirmation three times per cycle through the operation display light emitting diode LED8 (LED14). Steps, During the reclosing operation by storing the state of operation including the number of reclosing or the user's set value in the nonvolatile memory 19, the contact signal PROT.-RY or the breaker contact signal CB of the overcurrent relay is not applied. If not, performed by the steps of performing a reset.