State acquisition and action execution module of high-voltage switch cabinet

Abstract

The utility model provides a state acquisition and action execution module for a high-voltage switch cabinet. The state acquisition and action execution module comprises a display panel, an upper indication operation module, a lower acquisition execution module and a circuit breaker, the display panel is connected with the upper indication operation module, the circuit breaker is connected with the lower acquisition execution module, and the upper indication operation module is in communication connection with the lower acquisition execution module through RS485; the lower acquisition execution module is used for acquiring the state of the circuit breaker and transmitting the state to the upper indication operation module through an RS485, and the upper indication operation module displays the operation indication of the circuit breaker through a display panel; and the upper indication operation module transmits the operation command data to the lower acquisition execution module through RS485, and the lower acquisition execution module executes the operation command of the circuit breaker. According to the acquisition control device, the state of the control equipment is represented to be in the current state requirement through level change, and the technical problems of complex connection circuits and high wiring cost between the display module and the circuit breaker and between the operation module and the circuit breaker are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric power energy monitoring, specifically to a high voltage switch cabinet state acquisition and action execution module. BACKGROUND

[0002] The switch cabinet is a kind of electrical equipment, and the external line of the switch cabinet first enters the main control switch in the cabinet, then enters the branch control switch, and each branch is set according to its needs, such as instrument, automatic control, motor magnetic switch, various ac contactors and the like, and some are also provided with high-voltage room, low-voltage room switch cabinet, high-voltage bus, such as power plant and the like.

[0003] The main function of the switch cabinet is to open and close, control and protect the electrical equipment in the process of power generation, power transmission, power distribution and power conversion in the power system. The components in the switch cabinet mainly include circuit breakers, disconnectors, load switches, operating mechanisms, transformers and various protection devices. It is mainly suitable for power plants, substations, petrochemical industry, metallurgy and steel rolling, light industry and textile, factory and mine enterprises, residential areas, high-rise buildings and various different occasions.

[0004] In the prior art, the connection circuit between the display module and the operating module and the circuit breaker is complex, the wiring cost is high, and the cabinet body fault troubleshooting is difficult. At present, the working state of the circuit breaker, such as the breaking position, the closing position of the circuit breaker, the handcart working position, the handcart test position, the energy storage position of the circuit breaker, the ground knife position and the like, is indicated by the corresponding indicator light on the cabinet door of the instrument room through a large number of wiring from the circuit breaker room. The energy storage button, the closing button and the breaking button on the cabinet door also need to be controlled to the circuit breaker through the wiring from the cabinet door of the instrument room to the circuit breaker room, so that the secondary wiring work is heavy, and the fault line troubleshooting is difficult. SUMMARY

[0005] The utility model provides a kind of high voltage switch cabinet state acquisition and action execution module, and its purpose is to solve the technical problem that the connection circuit between the display module and the operating module and the circuit breaker is complex in the prior art, wiring cost is high, and cabinet body fault troubleshooting is difficult.

[0006] The utility model provides a kind of high voltage switch cabinet state acquisition and action execution module, including display panel, upper indication operating module, lower acquisition execution module and circuit breaker;

[0007] The display panel is connected with the upper indication operating module, the circuit breaker is connected with the lower acquisition execution module, and the upper indication operating module is connected with the lower acquisition execution module by RS485 communication connection;

[0008] The lower collection execution module is used for collecting the circuit breaker state and transmitting to the upper indication operation module through RS485, the upper indication operation module displays the operation indication of the circuit breaker through the display panel, and the upper indication operation module transmits the operation command data to the lower collection execution module through RS485, and the lower collection execution module executes the operation command of the circuit breaker.

[0009] Further, the upper indication operation module and the lower collection execution module each comprise a SoC processor, a DI voltage-resistant isolation input level conversion circuit module, a DO voltage-resistant isolation control output circuit module and a power supply POWER.

[0010] In the upper indication operation module, the SoC processor is connected with the DI voltage-resistant isolation input level conversion circuit module, the DO voltage-resistant isolation control output circuit module and the power supply POWER respectively, the DO voltage-resistant isolation control output circuit module is connected with the display panel, and the SoC processor is connected with the lower collection execution module through RS485.

[0011] In the lower collection execution module, the SoC processor is connected with the DI voltage-resistant isolation input level conversion circuit module, the DO voltage-resistant isolation control output circuit module and the power supply POWER respectively, and the DI voltage-resistant isolation input level conversion circuit module and the DO voltage-resistant isolation control output circuit module are connected with the circuit breaker respectively.

[0012] Further, the DI voltage-resistant isolation input level conversion circuit module comprises an external interface J1, the external interface J1 is connected with a TVS diode MOV, the TVS diode MOV is connected with a photoelectric coupling A1 and a secondary photoelectric signal confirmation circuit in sequence, the secondary photoelectric signal circuit is an NPN triode A_Q2 and an NPN triode A_Q1 connected in sequence, the output end of the secondary photoelectric signal is connected with a DIN pin of the SoC processor in series, the photoelectric coupling A1 and the NPN triode A_Q1 collector are connected in series, the NPN triode A_Q1 collector and base are connected in parallel with a resistor R2, the NPN triode A_Q1 collector is connected with the DIN pin of the SoC processor in series, the NPN triode A_Q1 emitter is connected with the base of the NPN triode A_Q2 in series, the NPN triode A_Q1 emitter and the base of the NPN triode A_Q2 are connected with a resistor in series, the NPN triode A_Q2 collector is connected with the DIN pin of the SoC processor in series, and the NPN triode A_Q2 emitter is grounded.

[0013] Further, the DO pressure-proof isolation control output circuit module comprises an external interface J5, the external interface J5 is connected with a photocoupler A2 in series, the output end of the photocoupler A2 is connected with the KZ1 pin of the SoC processor in series, and the output end of the photocoupler A2 is connected with VCC in series through a voltage dividing resistor; the photocoupler A2 and the external interface J5 are connected with a relay control circuit in series.

[0014] Further, the SoC processor is a high-performance 32-bit SoC processor; the REST pin of the SoC processor is connected with a monostable multivibrator U4 in series, the A pin of the monostable multivibrator U4 is connected with a monostable multivibrator U3 in series; the monostable multivibrators U4 and U3 are 4528 monostable multivibrators; the A pin of the monostable multivibrator U4 is connected with the Q pin of the monostable multivibrator U3 in series; the B pin of the monostable multivibrator U4 is connected with the power supply side VEMU through a resistor U4R2 in series; the monostable multivibrator U4 is grounded through a capacitor U4C2; the T5 pin of the monostable multivibrator U4 is connected with a capacitor U4C1 grounded and a resistor U4R1 connected with the power supply side in series respectively; the T2 pin of the monostable multivibrator U3 is connected with a capacitor U3C1 grounded and a resistor U3R1 connected with the power supply side in series respectively; and the A pin of the monostable multivibrator U3 is connected with the PW_S pin of the SoC processor.

[0015] Further, the AD_V pin of the SoC processor is connected with an operational amplifier circuit in series, the operational amplifier circuit is used for comparing and detecting the power supply voltage, introducing a voltage signal into the SoC processor, and enabling the SoC processor to monitor the voltage in real time.

[0016] Further, the LED1 pin of the SoC processor is connected with a light-emitting diode DU1 and a voltage dividing resistor RU3 for displaying the working state of the SoC processor in series; the LED2 pin of the SoC processor is connected with a light-emitting diode DU2 and a voltage dividing resistor RU4 for displaying the communication state of the SoC processor in series; and the voltage dividing resistors RU3 and RU4 are connected with the power supply side in parallel.

[0017] Further, the power supply POWER input end is connected with a voltage dividing resistor RP1 and a transient suppression diode P_D1 in series; the power supply POWER is connected with a common mode inductor NF in parallel, and the power supply POWER and the common mode inductor NF are connected with a capacitor P_C1 and a capacitor P_C2 in series in parallel; the output end of a line live wire and the input end of the power supply POWER live wire are connected with a fuse F1 in series, the positive output end of the power supply POWER is connected with a rectifier diode LN4007 in series, and the power supply POWER output end is connected with a transient suppression diode P_D4 in parallel; the power supply POWER is connected with a capacitor P_C4 in parallel; the power supply POWER is connected with a 5V voltage stabilizer P_U1 and a 3V voltage stabilizer P_U2 in parallel, the 5V voltage stabilizer P_U1 is connected with a capacitor P_C5 in parallel, and the 3V voltage stabilizer P_U2 is connected with a P_C6 in parallel.

[0018] The utility model has at least the following beneficial effects:

[0019] The utility model provides a high voltage switchgear state acquisition and action execution module, and the acquisition control device is used for representing the current state requirement of control equipment state through level change. The data feedback state signal of DI voltage resistance isolation input level conversion circuit module is transmitted to the SoC processor control module, and the important data is transmitted to the corresponding upper indication operation module through RS485 and corresponding communication network through SoC processor data calculation analysis and logic judgment. The upper indication operation module carries out the instruction operation of equipment, and the SoC processor control module combines the current feedback parameter to carry out logic safety intelligent control operation through RS485. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a kind of high voltage switchgear state acquisition and action execution module's schematic diagram for the utility model;

[0021] Figure 2 It is the upper indication operation module of a kind of high voltage switchgear state acquisition and action execution module for the utility model;

[0022] Figure 3 It is the lower acquisition execution module of a kind of high voltage switchgear state acquisition and action execution module for the utility model;

[0023] Figure 4 It is the mainboard circuit module schematic diagram of SoC processor of a kind of high voltage switchgear state acquisition and action execution module for the utility model;

[0024] Figure 5 It is the power supply POWER schematic diagram of a kind of high voltage switchgear state acquisition and action execution module for the utility model;

[0025] Figure 6The utility model relates to a DI voltage withstanding isolation input level conversion circuit module of high voltage switch cabinet state acquisition and action execution module

[0026] Figure 7 The utility model relates to a DO voltage withstanding isolation control output circuit module of high voltage switch cabinet state acquisition and action execution module. DETAILED DESCRIPTION

[0027] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0028] Please refer to Figures 1-7 The utility model provides a kind of high voltage switch cabinet state acquisition and action execution module, including operation display module, upper indication operation module, lower acquisition execution module and circuit breaker connected in sequence;Operation display module includes display module and operation module, the display module includes the indicator light of circuit breaker opening position, circuit breaker closing position, handcart working position, handcart test position, circuit breaker energy storage position, ground sword position state, and the operation module includes the button of opening operation, closing operation, energy storage operation.

[0029] The upper indication operation module includes SoC processor, DI voltage withstanding isolation input level conversion circuit module, DO voltage withstanding isolation control output circuit module, RS485, power POWER.Upper indication operation module connects traditional energy storage button, closing button, opening button into intelligent control system with SoC processor by program logic judgment, let its operation be safer, can accurately indicate the working state indicator light of current circuit breaker according to the state analysis of uploaded communication data, realize cabinet door panel intelligent operation and indication.

[0030] The lower collection execution module includes a SoC processor, a DI voltage-resistant isolation input level conversion circuit module, a DO voltage-resistant isolation control output circuit module, RS485, and a power supply POWER. The collection execution module transmits the circuit breaker opening position, the circuit breaker closing position, the handcart working position, the handcart test position, the circuit breaker energy storage position, and the ground knife position state of the collected circuit breaker to the upper indication operation module through a serial communication port to perform closing indication, opening indication, energy storage indication, ground knife position indication, handcart working position indication, and handcart test position indication. Meanwhile, the opening operation, the closing operation, and the energy storage operation command of the circuit breaker are also issued by the energy storage button, the closing button, and the opening button on the upper indication operation module to send operation signal instructions to the lower collection execution module through the serial communication port. Then, the lower collection execution module drives the circuit breaker opening operation, the circuit breaker closing operation, and the circuit breaker energy storage operation. The design of the high-voltage switch cabinet only needs one upper indication operation module to complete various operations and various displays of the switch cabinet, which simplifies the traditional high-voltage switch cabinet button, indicator light, and switch connection to the circuit breaker, and makes the maintenance extremely inconvenient. The intermediate secondary complex wiring and wiring labor cost are saved, and the troubleshooting and solution of the fault in the cabinet are facilitated.

[0031] The SoC processor is a high-performance 32-bit SoC processor; a monostable multivibrator U4 is connected in series with the REST pin of the SoC processor, and a monostable multivibrator U3 is connected in series with the A pin of the monostable multivibrator U3; the monostable multivibrators U4 and U3 are 4528 monostable multivibrators; the A pin of the monostable multivibrator U4 is connected in series with the Q pin of the monostable multivibrator U3; the B pin of the monostable multivibrator U4 is connected in series with the power supply side VEMU through a resistor U4R2, the monostable multivibrator U4 is grounded through a capacitor U4C2, the T5 pin 7 of the monostable multivibrator U4 is connected in series with a grounded capacitor U4C1 and a resistor U4R1 connected in series with the power supply side, respectively, and the T2 pin of the monostable multivibrator U3 is connected in series with a grounded capacitor U3C1 and a resistor U3R1 connected in series with the power supply side, respectively; and the A pin of the monostable multivibrator U3 is connected with the PW_S pin of the SoC processor. The self pin of the SoC processor is used for counting pulses, and any abnormality of the counting pulses will trigger the circuit. The SoC processor is reset by a pulse generated at a specified time; the monostable multivibrator U3 monitors the output pulse of the SoC processor, and a jump high is caused by a lost pulse, so that the monostable multivibrator U4 outputs a positive pulse to reset the SoC processor. U4C2 and U4R2 are used to generate a reset pulse.

[0032] The AD_V pin of the SoC processor is connected in series with an operational amplifier circuit, the operational amplifier circuit compares and detects the power supply voltage, the voltage signal is introduced into the SoC processor, the SoC processor monitors the voltage in real time to ensure that the power supply voltage of the SoC processor can work normally. If the voltage is abnormal, the SoC processor will perform temporary flash protection on important running data; the LED1 pin of the SoC processor is connected in series with a light emitting diode DU1 and a voltage dividing resistor RU3, the LED2 pin of the SoC processor is connected in series with a light emitting diode DU2 and a voltage dividing resistor RU4, and the voltage dividing resistor RU3 and the voltage dividing resistor RU4 are connected in parallel on the power supply side. The light emitting diode DU1 and the light emitting diode DU2 are used to display the working state and communication state of the SoC processor.

[0033] The DI voltage-resistant isolation input level conversion circuit module comprises an external interface J1, the external interface J1 is connected in parallel with a TVS diode MOV, the TVS diode MOV is connected in series with a photoelectric coupler A1 and a headphone photoelectric signal confirmation circuit in sequence, the secondary photoelectric signal circuit is an NPN triode A_Q2 and an NPN triode A_Q1 connected in series, and the output end of the secondary photoelectric signal is connected in series with the DIN pin of the SoC processor. The photoelectric coupler A1 and the NPN triode A_Q1 collector are connected in series, the NPN triode A_Q1 collector and base are connected in parallel with a resistor R2, and the NPN triode A_Q1 collector is connected in series with the DIN pin of the SoC processor; the emitter of the NPN triode A_Q1 is connected in series with the base of the NPN triode A_Q2, the collector of the NPN triode A_Q2 is connected in series with the DIN pin of the SoC processor; and the emitter of the NPN triode A_Q2 is grounded. The DI voltage-resistant isolation input level conversion circuit module utilizes the characteristics of photoelectric control to perform level conversion transmission, isolates the interference source to the input end, and ensures that the signal level of the control system composed of the SoC processor control module is clean and stable. The signal enters from the external interface J1, is filtered and decoupled to reach the TLP251 photoelectric coupler, is subjected to the photoelectric conversion characteristics of the photoelectric coupler, is isolated and transmitted, and the converted signal is subjected to two-stage signal level confirmation circuit to output the level to the SoC processor.

[0034] The DO voltage-withstanding isolation control output circuit module comprises an external interface J5, the external interface J5 is connected in series with an optocoupler A2, the output end of the optocoupler A2 is connected in series with a KZ1 pin of a SoC processor, and a relay control circuit is connected in series between the optocoupler A2 and the external interface J5. The DO voltage-withstanding isolation control output circuit module uses the principle of isolation control output to safely and stably output an output control signal and has the function of reverse noise filtering. A2 uses its own photoelectric characteristics to isolate and convert an external signal. The level of the signal is controlled, and the relay outputs. The optoelectronic conversion of the optocoupler has its own characteristics. The signal is transmitted in isolation, and the converted signal is transmitted to the relay control circuit.

[0035] The power supply POWER is connected in series with a voltage dividing resistor RP1 and a transient suppression diode P_D1; the power supply POWER is connected in parallel with a common mode inductor NF for suppressing common mode signal interference and canceling common mode noise, and a capacitor P_C1 and a capacitor P_C2 are connected in parallel between the power supply POWER and the common mode inductor NF, and the capacitor P_C1 and the capacitor P_C2 are connected in series; a fuse F1 is connected in series between the output end of a line live wire and the input end of the power supply POWER live wire, and a thermistor NTC is arranged between the output end of a line zero wire and the input end of the power supply POWER zero wire for temperature compensation to avoid excessive detection drift; a rectifier diode LN4007 is connected in series with the positive output end of the power supply POWER, a transient suppression diode P_D4 is connected in parallel with the power supply POWER output end for preventing reverse voltage; the power supply POWER is connected in parallel with a capacitor P_C4; the power supply POWER is connected in parallel with a 5V voltage stabilizer P_U1 and a 3V voltage stabilizer P_U2, the 5V voltage stabilizer P_U1 is connected in parallel with a capacitor P_C5, and the 3V voltage stabilizer P_U2 is connected in parallel with a P_C6. The power supply POWER performs front-end circuit voltage stabilization, noise reduction, and decoupling of interference signals on a 220V alternating current signal, reduces and isolates the parameters after matching, converts the alternating current signal into a direct current low-voltage digital signal, and transmits the signal to the SoC processor chip main control board.

[0036] The high-performance SoC processor in the lower collection execution module can capture high-sensitivity and high-precision level signals of the breaker tripping position, the breaker closing position, the handcart working position, the handcart test position, the breaker energy storage position, and the ground knife position state of the circuit breaker through the DI voltage-withstanding isolation input level conversion circuit module, perform level conversion through powerful calculation logic analysis of the high-performance SoC processor, and upload the state data of the DI isolation input circuit module to the upper indication operation module for state display through RS485. At the same time, the upper indication operation module transmits the customer's operation command data to the lower collection execution module through RS485, the high-performance SoC processor performs command data logic analysis, and executes the operation command of the circuit breaker through the DO control output circuit module.

Claims

1. A high-voltage switch cabinet state acquisition and action execution module, comprising a display panel, an upper indication operation module, a lower acquisition execution module and a circuit breaker; the display panel is connected with the upper indication operation module, the circuit breaker is connected with the lower acquisition execution module, and the upper indication operation module is connected with the lower acquisition execution module through RS485 communication; the lower acquisition execution module is used for acquiring the state of the circuit breaker and transmitting the state to the upper indication operation module through RS485, the upper indication operation module displays the operation indication of the circuit breaker through the display panel, and the upper indication operation module transmits operation command data to the lower acquisition execution module through RS485, and the lower acquisition execution module executes the operation command of the circuit breaker. The upper indication operation module and the lower acquisition execution module each comprise a SoC processor, a DI voltage-withstanding isolation input level conversion circuit module, a DO voltage-withstanding isolation control output circuit module and a power supply POWER; In the upper indication operation module, the SoC processor is connected with the DI voltage-withstanding isolation input level conversion circuit module, the DO voltage-withstanding isolation control output circuit module and the power supply POWER respectively, the DO voltage-withstanding isolation control output circuit module is connected with the display panel, and the SoC processor is connected with the lower acquisition execution module through RS485; 2. The high-voltage switch cabinet state acquisition and action execution module according to claim 1, characterized in that, In the lower acquisition execution module, the SoC processor is connected with the DI voltage-withstanding isolation input level conversion circuit module, the DO voltage-withstanding isolation control output circuit module and the power supply POWER respectively, and the DI voltage-withstanding isolation input level conversion circuit module and the DO voltage-withstanding isolation control output circuit module are connected with the circuit breaker respectively. The DI voltage-withstanding isolation input level conversion circuit module comprises an external interface J1, the external interface J1 is connected with a TVS diode MOV, the TVS diode MOV is connected with a photocoupler A1 and a secondary photoelectric signal confirmation circuit in sequence, the secondary photoelectric signal circuit is an NPN triode A_Q2 and an NPN triode A_Q1 connected in sequence, the output end of the secondary photoelectric signal is connected with a DIN pin of the SoC processor in series, the photocoupler A1 and the NPN triode A_Q1 collector are connected in series, a resistor R2 is connected between the collector and the base of the NPN triode A_Q1 in parallel, the collector of the NPN triode A_Q1 is connected with the DIN pin of the SoC processor in series, the emitter of the NPN triode A_Q1 is connected with the base of the NPN triode A_Q2 in series, a resistor is connected between the emitter of the NPN triode A_Q1 and the base of the NPN triode A_Q2 in series, the collector of the NPN triode A_Q2 is connected with the DIN pin of the SoC processor in series, and the emitter of the NPN triode A_Q2 is grounded. The DO voltage-withstanding isolation control output circuit module comprises an external interface J5, the external interface J5 is connected with a photocoupler A2, the output end of the photocoupler A2 is connected with a KZ1 pin of the SoC processor in series, and the output end of the photocoupler A2 is connected with VCC in series through a voltage dividing resistor; a relay control circuit is connected between the photocoupler A2 and the external interface J5 in series.

3. The high-voltage switch cabinet state acquisition and action execution module according to claim 2, characterized in that, ​ 4. The high-voltage switch cabinet state acquisition and action execution module according to claim 2, characterized in that, ​ 5. The high-voltage switch cabinet state acquisition and action execution module according to claim 2, characterized in that, The SoC processor is a high-performance 32-bit SoC processor; the REST pin of the SoC processor is connected in series with a monostable multivibrator U4, the A pin of the monostable multivibrator U4 is connected in series with a monostable multivibrator U3; the monostable multivibrator U4 and the monostable multivibrator U3 are 4528 monostable multivibrators; the A pin of the monostable multivibrator U4 is connected in series with the Q pin of the monostable multivibrator U3; the B pin of the monostable multivibrator U4 is connected in series with the power supply side VEMU through the resistor U4R2, the monostable multivibrator U4 is grounded through the capacitor U4C2, the T5 pin 7 of the monostable multivibrator U4 is connected in series with the grounded capacitor U4C1 and the resistor U4R1 connected in series with the power supply side respectively, and the T2 pin of the monostable multivibrator U3 is connected in series with the grounded capacitor U3C1 and the resistor U3R1 connected in series with the power supply side respectively; the A pin of the monostable multivibrator U3 is connected with the PW_S pin of the SoC processor.

6. The high-voltage switch cabinet state acquisition and action execution module according to claim 5, characterized in that, The AD_V pin of the SoC processor is connected in series with an operational amplifier circuit, which is used for comparison detection of the power supply voltage, introduces a voltage signal into the SoC processor, and enables the SoC processor to monitor the voltage in real time.

7. The high-voltage switch cabinet state acquisition and action execution module according to claim 5, characterized in that, The LED1 pin of the SoC processor is connected in series with a light-emitting diode DU1 for displaying the working state of the SoC processor and a voltage dividing resistor RU3, and the LED2 pin of the SoC processor is connected in series with a light-emitting diode DU2 for displaying the communication state of the SoC processor and a voltage dividing resistor RU4, and the voltage dividing resistor RU3 and the voltage dividing resistor RU4 are connected in parallel with the power supply side.

8. The high-voltage switch cabinet state acquisition and action execution module according to claim 5, characterized in that, The power supply POWER input end is connected in series with a voltage dividing resistor RP1 and a transient suppression diode P_D1; the power supply POWER is connected in parallel with a common mode inductor NF, and the power supply POWER and the common mode inductor NF are connected in parallel with a capacitor P_C1 and a capacitor P_C2 connected in series; the output end of the line live wire and the input end of the power supply POWER live wire are connected in series with a fuse F1, the positive output end of the power supply POWER is connected in series with a rectifier diode LN4007, and the output end of the power supply POWER is connected in parallel with a transient suppression diode P_D4; the power supply POWER is connected in parallel with a capacitor P_C4; the power supply POWER is connected in parallel with a 5V voltage stabilizer P_U1 and a 3V voltage stabilizer P_U2, the 5V voltage stabilizer P_U1 is connected in parallel with a capacitor P_C5, and the 3V voltage stabilizer P_U2 is connected in parallel with a P_C6.

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