CN215186530U - Voltage regulating transformer control circuit for nuclear power station - Google Patents
Voltage regulating transformer control circuit for nuclear power station Download PDFInfo
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- CN215186530U CN215186530U CN202120777181.4U CN202120777181U CN215186530U CN 215186530 U CN215186530 U CN 215186530U CN 202120777181 U CN202120777181 U CN 202120777181U CN 215186530 U CN215186530 U CN 215186530U
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Abstract
The utility model discloses a voltage regulating transformer control circuit for nuclear power station, including PLC, touch-sensitive screen, voltage transmitter, switching power supply, converter, servo motor, 2 the same opens and stops and positive and negative rotating relay (K1 and K2) and 4 the same travel switch (SQ1-SQ 4); the PLC output end is connected with the relay, the start-stop relay is connected with the forward and reverse relay, the forward and reverse relay is connected with the frequency converter through the travel switch, and the frequency converter controls the servo motor. When the input voltage fluctuates in a certain range, the control circuit can control the voltage regulating transformer to keep the output voltage at a certain precision and stably output rated voltage so as to keep the voltage stability of the subsequent safety-level equipment and other electric equipment; meanwhile, the control circuit carries out remote automatic control on the voltage-regulating transformer, the control precision is high, the operation is convenient, the PLC replaces the original circuit board, the reliability is improved, and the limit control of the travel switch ensures that the equipment cannot be damaged when in failure.
Description
Technical Field
The utility model relates to a regulating transformer control circuit especially relates to a regulating transformer control circuit for nuclear power station.
Background
With the increasing tension of energy requirements and the importance on environmental protection, nuclear power is increasingly valued and developed in China as a new energy with high efficiency and environmental protection. The nuclear power station has strict requirements on the safety and reliability of equipment, particularly equipment in a nuclear island, and safety-level voltage regulating transformer equipment is newly added to improve the reliability requirement on the safety-level equipment. The voltage regulating transformer is one of important devices in a safety level system, and has the functions of keeping certain precision of output voltage and stably outputting rated voltage when input voltage fluctuates within a certain range so as to keep the voltage stability of subsequent safety electric equipment.
The original control mode of the voltage regulating transformer for the nuclear power station is a circuit board control mode, only one protection is needed, and the reliability of equipment is not high enough.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a regulating transformer control circuit for nuclear power station is provided, the utility model discloses take duplicate protection, PLC implements remote control to equipment, replaces the tradition and adopts circuit board control mode, can lifting means reliability.
Solve above-mentioned technical problem, the utility model discloses the technical scheme who adopts as follows:
the utility model provides a regulating transformer control circuit for nuclear power station, includes switching power supply and the converter of opening and shutting relay (K1) and just reversing relay (K2) and connecting, converter control servo motor, characterized by: the device also comprises a programmable logic controller PLC, a voltage transmitter, third and fourth stroke switches SQ3 and SQ4 for upper limit and first and second stroke switches SQ1 and SQ2 for lower limit;
the normally open points of the third and fourth stroke switches SQ3 and SQ4 are connected in parallel with a programmable logic controller PLC: i0.5 connection, the normally open points of the first and second stroke switches SQ1 and SQ2 are connected in parallel with a programmable logic controller PLC: i0.6 connection; when the carbon brush runs to the upper limit or the lower limit, the normally open point becomes the normally closed point, and a shutdown voltage signal is input into the programmable logic controller PLC: i0.5 or programmable logic controller PLC: i0.6, at which time the programmable logic controller PLC: the Q0.3 output voltage signal controls a start-stop relay (K1) to suck, and the motor stops;
the normally closed ports of the first travel switch SQ1 and the second travel switch SQ2 are connected in series, one end of the normally closed port is connected with the 12 port of the forward and reverse relay K2, and the other end of the normally closed port is connected with the reverse ML1 port of the frequency converter VF; the normally closed ports of the third travel switch SQ3 and the fourth travel switch SQ4 are connected in series, one end of the third travel switch SQ3 is connected with the 9 port of the forward and reverse relay K2, and the other end of the third travel switch SQ4 is connected with the forward rotation ML2 port of the frequency converter VF; when the carbon brush runs to the lower limit, the normally closed port of the first travel switch and the second travel switch which are connected in series is disconnected, and the PLC is cut off to transmit the current to the frequency converter VF: a signal of ML1, when the motor stops reversing in synchronization with the first and second travel switch normally open point closures; when the carbon brush runs to the upper limit, the normally closed port of the third travel switch and the fourth travel switch which are connected in series is disconnected, and the PLC is cut off to transmit the current to the frequency converter VF: the signal of ML2, at this time, the motor stops rotating forward synchronously with the closing of the normally open points of the third and fourth travel switches;
the voltage transmitter converts the output voltage into a 0-5V linear direct-current voltage signal to be compared with a set voltage value, and when the deviation value of the output voltage and the set voltage is more than +/-1%, the PLC controls start-stop and forward-reverse relays (K1 and K2) to realize voltage regulation;
the normally open point and the normally closed point of the forward and reverse relay (K2) are connected together, and then the forward and reverse relay is connected with the start-stop relay (K1).
The PPI port of the PLC is externally connected with a touch screen, and the grounding port of the PLC is simultaneously connected with the 13 ports, the M port and the A + port of the start-stop and forward-reverse relay and is externally connected with the output ends OUT-5 and OUT +6 of the voltage transmitter.
The ports described above may be changed as long as they are set in the program.
And the positive output (+ A) of the switching power supply is connected to a 1M port of the PLC, and the negative-A of the switching power supply is simultaneously connected with normally-open ports of the first travel switch, the second travel switch and the fourth travel switch.
The principle of the utility model is as follows: a travel switch normally-closed point is connected in series between a forward and reverse rotation relay K2 for controlling the forward and reverse rotation of the servo motor and the frequency converter, and a contact K2 for controlling the forward rotation of the servo motor is as follows: 9 is connected to the normally closed points of the upper limit stroke switches SQ3 and SQ4, and controls the contact K2 for reversing the servo motor: the lower limit travel switches SQ1 and SQ2 are connected to normally closed points, in which normally closed points SQ3 and SQ4 are connected in series, and normally closed points SQ1 and SQ2 are connected in series.
The other ends of the series of normal close points SQ3 and SQ4 are connected to a frequency converter ML2 (for controlling the forward rotation of the servomotor), and the other ends of the series of normal close points SQ1 and SQ2 are connected to a frequency converter ML1 (for controlling the reverse rotation of the servomotor).
When the carbon brush runs to the upper limit, the normally closed point of the upper limit travel switches SQ3 and SQ4 becomes the normally open point, the PLC is cut off the signal input to the frequency converter ML2 (controlling the servo motor to rotate forwards), and the servo motor stops rotating forwards. Meanwhile, the normally open points of SQ3 and SQ4 become normally closed points, a shutdown voltage signal is input to the PLC (programmable logic controller) I0.5, so that the PLC Q0.3 outputs a shutdown signal to control the relay K1 to suck, a signal of the PLC for controlling the frequency converter is cut off, and the servo motor stops running. That is, the normal open point of SQ3 and SQ4 controls the PLC of the servo motor to rotate normally to input the shutdown signal, the normal close point of SQ3 and SQ4 controls the PLC of the servo motor to rotate normally to output the signal to the frequency converter, and the normal open point and the normal close point of SQ3 and SQ4 operate simultaneously, so that even if the normal open point fails, the normal close point can cut off the servo motor operation, and the voltage-regulating transformer has double protection function.
Similarly, when the carbon brush is operated to the lower limit, the normally open point of SQ1 or SQ2 becomes the normally closed point, and the normally closed point becomes the normally open point. If the normally open points of SQ1 and SQ2 are in fault at this time, no shutdown voltage signal is input to the PLC, I0.6, the relay K1 does not act, the normally closed points of SQ1 and SQ2 become normally open points, the signal transmitted to the frequency converter ML1 (controlling the reverse rotation of the servo motor) from K2:12 is cut off, and the reverse rotation of the servo motor is stopped.
In the control electrical diagram, the normally open points of the travel switches are connected in parallel for PLC input signals for controlling the forward and reverse rotation of the servo motor, and the normally closed points of the travel switches are connected in series for PLC output signals for controlling the forward and reverse rotation of the servo motor, so that the functions of the travel switches are fully utilized. The design has the advantages that under the premise of not increasing any cost, as long as any stroke is out of order, the whole transmission control system can stop running immediately, the phenomena of carbon brush ejection and servo motor rotation drawing bending cannot occur, and the reliable operation of the voltage regulating transformer is ensured.
The 4 travel switches are divided into two groups, and the upper limit of the carbon brush in the boosting process and the lower limit of the carbon brush in the voltage reduction process are respectively controlled. Two groups of travel switches connected to the input end of the PLC adopt normally open points which are connected in parallel, and are connected with a relay K2 adopt normally closed points which are connected in series to realize double protection of the voltage-regulating transformer.
Relay K1 control servo motor opens and stops the signal, and relay K2 control servo motor is positive and negative to be changeed the signal, and relay K2 is normal open point and normal close point are parallelly connected and are connected with relay K1 and realize the interlocking, avoid positive and negative commentaries on classics signal simultaneous input.
And the voltage transmitter converts the output voltage of the voltage regulating transformer into a linear analog signal and feeds the linear analog signal back to the PLC, and the linear analog signal is compared with a voltage value set by the touch screen to realize closed-loop control.
The PLC sets a corresponding program, when the deviation of the feedback voltage and the set voltage value is within the range of +/-1% or a limit switch acts, the PLC does not output a signal, and the servo motor stops running; when the output voltage is smaller than the set value and exceeds the deviation, the PLC outputs a signal to control the relays K1 and K2 to act simultaneously, and the servo motor rotates forwards; when the output voltage is larger than the set value and exceeds the deviation PLC output signal to control the relay K1 to act, the servo motor rotates reversely.
The utility model has the advantages that: the utility model has the advantages that the double protection is adopted for the circuit according to the 60-year service life requirement of the safety-level voltage regulating transformer, thereby avoiding the damage to the safe operation of the equipment caused by the carbon brush top impact due to the fault of the limiter; remote control is implemented to equipment through touch-sensitive screen and PLC, has replaced the tradition to adopt circuit board control mode, and PLC automatic computation output required voltage, control accuracy is high, has promoted equipment reliability.
Drawings
FIG. 1 is a circuit diagram of a conventional voltage regulating transformer for a nuclear power plant;
fig. 2 the utility model discloses a regulating transformer control circuit diagram for nuclear power station.
Detailed Description
Referring to fig. 2, for the utility model discloses a regulating transformer control circuit embodiment for nuclear power station, include switching power supply VI and converter VF, converter control servo motor M that the relay K1 and the relay K2 are connected that open and stop.
In addition, a touch screen, a programmable logic controller PLC, a voltage transmitter, third and fourth stroke switches SQ3 and SQ4 for upper limit, and first and second stroke switches SQ1 and SQ2 for lower limit are included.
Wherein: the PPI port of the programmable logic controller PLC is externally connected with a touch screen, the 0.5 port of the I side is simultaneously connected with one end of the normally-open port of the third stroke switch SQ3 and the fourth stroke switch SQ4, the 0.6 port of the I side is simultaneously connected with one end of the normally-open port of the first stroke switch SQ1 and the second stroke switch SQ2, the 0.3 port and the 0.4 port of the Q side are respectively connected with 14 ports of the start-stop relay K1 and the forward-reverse relay K2, the grounding port is simultaneously connected with the 13 ports of the start-stop relay and the forward-reverse relay, the M port and the A + port are connected with the output ends OUT-5 and OUT +6 of the voltage transmitter.
The input ends IN3 and IN4 of the voltage transmitter are connected with output voltage; and the positive electrode output (+ A) of the switching power supply VI is connected to the 1M port and the negative electrode-A on the PLCI side of the programmable logic controller, and the negative electrode-A is simultaneously connected with the other ends of the normally-open ports of the first travel switch, the second travel switch and the fourth travel switch.
The normally closed ports of the first travel switch and the second travel switch are connected, and the normally closed ports of the third travel switch and the fourth travel switch are connected. One end SQ1 of the normally closed ports of the connected first travel switch and the second travel switch is connected with the 12 port of the forward and reverse relay K2, and the other end SQ2 is connected with the ML1 port of the frequency converter VF. One end SQ3 of the normally closed ports of the third travel switch and the fourth travel switch which are connected is connected with the 9 port of the forward and reverse relay K2, and the other end SQ4 is connected with the ML1 port of the frequency converter VF.
The DCM port of the frequency converter VF is connected with the 5 port of the start-stop relay K1, and the 9 port of the start-stop relay is simultaneously connected with the 4 port and the 5 port of the forward-reverse relay K2.
Of course, the ports may be changed as long as they are set in the program.
When the voltage transformer works, the required voltage is set on the touch screen according to actual needs, and the voltage transformer feeds the output voltage back to the PLC to be compared with the set voltage.
When the output voltage is smaller than the set value and exceeds the deviation, the PLC outputs a signal to control the relays K1 and K2 to act simultaneously, and the servo motor rotates forwards; when the output voltage rises to the range of +/-1% deviation from the set voltage value, the PLC controls the relay K1 to stop the servo motor; when the output voltage is larger than the set value and exceeds the deviation PLC output signal, only the relay K1 is controlled to act, the reverse signal is transmitted to the servo motor through the normally closed point of the relay K2 until the output voltage is reduced to the deviation of +/-1% from the set voltage, and the servo motor stops running. When the set voltage exceeds the voltage regulation permission range, the servo motor drives the carbon brush to operate all the time until the carbon brush touches the limit switch, and the motor stops operating.
Claims (4)
1. The utility model provides a regulating transformer control circuit for nuclear power station, includes switching power supply and the converter of opening and shutting relay (K1) and just reversing relay (K2) and connecting, converter control servo motor, characterized by: the device also comprises a programmable logic controller PLC, a voltage transmitter, third and fourth travel switches (SQ3 and SQ4) for upper limit and first and second travel switches (SQ1 and SQ2) for lower limit;
the normally open points of the third and fourth travel switches (SQ3 and SQ4) are connected in parallel with a Programmable Logic Controller (PLC): i0.5 connection, the normally open points of the first and second travel switches (SQ1 and SQ2) being connected in parallel to a programmable logic controller PLC: i0.6 connection;
the normally closed ports of the first travel switch and the second travel switch (SQ1 and SQ2) are connected in series, one end of the normally closed ports is connected with the 12 port of a forward and reverse relay (K2), and the other end of the normally closed ports is connected with the reverse ML1 port of a frequency converter (VF);
the normally closed ports of the third travel switch and the fourth travel switch (SQ3 and SQ4) are connected in series, one end of the third travel switch and the fourth travel switch is connected with the 9 port of a forward and reverse relay (K2), and the other end of the third travel switch and the fourth travel switch is connected with a forward rotation ML2 port of a frequency converter (VF);
and a normally open point and one end of a normally closed point of the forward and reverse relay (K2) are connected together, and then the forward and reverse relay is connected with a start-stop relay (K1).
2. The voltage regulating transformer control circuit for a nuclear power plant as set forth in claim 1, wherein: and the PPI port of the programmable logic controller PLC is externally connected with a touch screen.
3. The voltage regulating transformer control circuit for a nuclear power plant as set forth in claim 1, wherein: and the M port and the A + port of the programmable logic controller PLC are externally connected with output ends OUT-5 and OUT +6 of the voltage transmitter.
4. The voltage regulating transformer control circuit for a nuclear power plant as set forth in claim 1, wherein: and the positive output (+ A) of the switching power supply is connected to a 1M port of the PLC, and the negative-A of the switching power supply is simultaneously connected with normally-open ports of the first travel switch, the second travel switch and the fourth travel switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120777181.4U CN215186530U (en) | 2021-04-15 | 2021-04-15 | Voltage regulating transformer control circuit for nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120777181.4U CN215186530U (en) | 2021-04-15 | 2021-04-15 | Voltage regulating transformer control circuit for nuclear power station |
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| Publication Number | Publication Date |
|---|---|
| CN215186530U true CN215186530U (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120777181.4U Active CN215186530U (en) | 2021-04-15 | 2021-04-15 | Voltage regulating transformer control circuit for nuclear power station |
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| Country | Link |
|---|---|
| CN (1) | CN215186530U (en) |
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2021
- 2021-04-15 CN CN202120777181.4U patent/CN215186530U/en active Active
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