Intelligent on-line monitoring device for transformer substation

Abstract

The utility model relates to the technical field of transformer substation safety monitoring, in particular to an intelligent on-line monitoring device for a transformer substation, which comprises a background host, an on-line detection host, an on-line detection sensor and primary equipment, and is characterized in that the on-line detection host is electrically connected with the background host and the on-line detection sensor respectively; the primary device is electrically connected with the on-line detection sensor, original relatively independent monitoring devices are integrated, different monitoring devices are integrated and managed, multiple groups of data information can be processed at the same time and then uploaded to the background host, and the processing capacity of the data information is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of substation safety monitoring, in particular to an intelligent on-line monitoring device for a substation. Background Technique

[0002] A substation refers to a place in the power system that transforms voltage and current, receives electric energy and distributes electric energy. The substation in a power plant is a step-up substation, and its function is to step up the electric energy generated by a generator and feed it into the high-voltage power grid. The equipment is divided into primary equipment and secondary equipment. The primary equipment refers to the equipment that directly produces, transports, distributes and uses electric energy. The secondary equipment of a substation refers to the equipment that measures, monitors, controls and protects the operating conditions of the primary equipment and the system.

[0003] In a traditional substation, each monitoring device of the substation is relatively independently set, and each piece of information is separately displayed and transmitted, which is not easy to integrate and manage and view. Therefore, when multiple pieces of information are simultaneously displayed and transmitted, the processing efficiency of the substation will be greatly reduced. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an intelligent on-line monitoring device for a substation, which integrates and processes the collected information and uploads it to a background host to improve the processing efficiency.

[0005] In order to solve the above technical problem, the technical solution adopted by the utility model is as follows:

[0006] An intelligent on-line monitoring device for a substation includes a background host, an on-line detection host, on-line detection sensors and primary equipment;

[0007] The on-line detection host is electrically connected to the background host and the on-line detection sensors respectively, and the primary equipment is electrically connected to the on-line detection sensors;

[0008] The on-line detection host comprehensively processes the state data of the primary equipment collected by the on-line detection sensors and sends them to the background host.

[0009] The beneficial effects of the utility model are as follows:

[0010] An intelligent on-line monitoring device for a substation provided by the utility model includes a background host, an on-line detection host, on-line detection sensors and primary equipment. The on-line detection host is electrically connected to the background host and the on-line detection sensors respectively, and the primary equipment is electrically connected to the on-line detection sensors. The originally relatively independent monitoring devices are integrally set, and different monitoring devices are integrally managed. After multiple groups of data information are simultaneously processed, they can be uploaded to the background host, improving the processing ability of the data information. Description of the Drawings

[0011] Figure 1 It is the overall structural block diagram of an intelligent on-line monitoring device for a substation of the present utility model;

[0012] Figure 2 It is the circuit connection diagram of the RS485 communication circuit of an intelligent on-line monitoring device for a substation of the present utility model;

[0013] Figure 3 It is the circuit connection diagram of the Ethernet chip of an intelligent on-line monitoring device for a substation of the present utility model;

[0014] Figure 4 It is the circuit connection diagram of the network socket of an intelligent on-line monitoring device for a substation of the present utility model;

[0015] Figure 5 It is the circuit connection diagram of the live detection circuit of the GIS live sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0016] Figure 6 It is the circuit connection diagram of the partial discharge acquisition circuit of the partial discharge sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0017] Figure 7 It is the circuit connection diagram of the current acquisition circuit of the breaker mechanical characteristic sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0018] Figure 8 It is the circuit connection diagram of the light source generation circuit of the SF6 micro water density sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0019] Figure 9 It is the circuit connection diagram of the surface condensation condition acquisition circuit of the SF6 micro water density sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0020] Figure 10 It is the circuit connection diagram of the mirror surface temperature detection circuit of the SF6 micro water density sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0021] Figure 11 It is the circuit connection diagram of the refrigeration circuit of the SF6 micro water density sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0022] Figure 12 It is the circuit connection diagram of the heating circuit of the SF6 micro water density sensor of an intelligent on-line monitoring device for a substation of the present utility model;

[0023] Figure 13The circuit connection diagram of the pressure acquisition circuit of the SF6 micro - water density sensor of an intelligent on - line monitoring device for a substation of the present utility model;

[0024] Label description:

[0025] 1. Background host; 2. On - line detection host; 3. On - line detection sensor; 4. Primary equipment. Specific implementation mode

[0026] To describe in detail the technical content, achieved purpose and effects of the present utility model, the following is described in conjunction with the implementation mode and accompanied by the drawings.

[0027] Please refer to Figures 1 to 13 As shown, an intelligent on - line monitoring device for a substation includes a background host, an on - line detection host, an on - line detection sensor and primary equipment;

[0028] The on - line detection host is electrically connected to the background host and the on - line detection sensor respectively, and the primary equipment is electrically connected to the on - line detection sensor;

[0029] The on - line detection host comprehensively processes the status data of the primary equipment collected by the on - line detection sensor and then sends it to the background host.

[0030] From the above description, the beneficial effects of the present utility model are as follows:

[0031] An intelligent on - line monitoring device for a substation provided by the present utility model includes a background host, an on - line detection host, an on - line detection sensor and primary equipment. The on - line detection host is electrically connected to the background host and the on - line detection sensor respectively, and the primary equipment is electrically connected to the on - line detection sensor. The originally relatively independent monitoring devices are integrated and set up, and different monitoring devices are integrated and managed. After processing multiple groups of data information simultaneously, it can upload them to the background host, improving the processing ability of data information.

[0032] Furthermore, the on - line detection host includes an MCU chip and an RS485 communication circuit;

[0033] The MCU chip is electrically connected to the RS485 communication circuit;

[0034] The RS485 communication circuit includes a terminal block J1, resistors R34, R36, R37, R38, R39, R40, R41, R42, TVS diodes D6, D7, bidirectional TVS diode VP1 and transceiver chip U9;

[0035] One end of the resistor R36 is electrically connected to the data sending end TX of the MCU chip, and the other end of the resistor R36 is electrically connected to the receiver output end RO of the transceiver chip U9. One end of the resistor R42 is electrically connected to the data receiving end RX of the MCU chip, and the other end of the resistor R42 is electrically connected to the driver input end RO of the transceiver chip U9. One end of the resistor R38 is connected to the peripheral power supply VCC, and the other end of the resistor R38 is electrically connected to the receiver output enable end RE and the driver output enable end DE of the transceiver chip U9 respectively;

[0036] The in-phase end A of the transceiver chip U9 is electrically connected to the peripheral power supply VCC through the resistor R41. The anti-phase end B of the transceiver chip U9 is electrically connected to the peripheral power supply VCC through the resistor R34. One end of the resistor R39 is electrically connected to the in-phase end A of the transceiver chip U9, and the other end of the resistor R39 is electrically connected to the negative electrode of the TVS diode D7, one end of the bidirectional TVS diode VP1 and one end of the resistor R40 respectively. The positive electrode of the TVS diode D7 is grounded. One end of the resistor R37 is electrically connected to the anti-phase end B of the transceiver chip U9, and the other end of the resistor R37 is electrically connected to the negative electrode of the TVS diode D6, one end of the bidirectional TVS diode VP1 and the other end of the resistor R40 respectively. The positive electrode of the TVS diode D6 is grounded. Both ends of the resistor R40 are electrically connected to the terminal block J1.

[0037] As can be seen from the above description, the resistors R37 and R39 are current-limiting resistors for protection. The resistors R34 and R41 pull up RS485A and pull down RS485B to widen the RS485 voltage. The functions of the TVS diode D6, the TVS diode D7 and the bidirectional TVS diode VP1 are lightning protection and surge protection.

[0038] Further, the on-line detection sensor includes a GIS live sensor;

[0039] The GIS live sensor includes a live detection circuit. The live detection circuit includes a capacitor C10, a probe U15, resistors R56, R57, R58, R59, R60, R61, R62, R63, R64, an amplifier U14A, an amplifier U14B and a diode D2;

[0040] One end of the probe U15 is electrically connected to one end of the resistor R60 and one end of the resistor R59 respectively. The other end of the probe U15 is grounded. The other end of the resistor R60 is electrically connected to the negative electrode of the diode D2. The positive electrode of the diode D2 is grounded. The other end of the resistor R59 is electrically connected to one end of the resistor R58, one end of the resistor R61 and one end of the resistor R63 respectively. The other end of the resistor R63 is grounded. The other end of the resistor R61 is electrically connected to one end of the resistor R64 and one end of the resistor R62 respectively. The other end of the resistor R64 is grounded. The other end of the resistor R62 is electrically connected to the non-inverting input terminal of the amplifier U14B. The output terminal of the amplifier U14B is electrically connected to the inverting input terminal of the amplifier U14B and the terminal block J1 respectively. The other end of the resistor R58 is electrically connected to the non-inverting input terminal of the amplifier U14A. One end of the resistor R57 is electrically connected to the inverting input terminal of the amplifier U14A, one end of the resistor R56 and one end of the capacitor C10 respectively. The output terminal of the amplifier U14A is electrically connected to the other end of the resistor R56, the other end of the capacitor C10 and the terminal block J1 respectively.

[0041] As can be seen from the above description, the function of the probe U15 is to sense voltage. The resistors R60 and the diode D2 act as voltage limiters. When the probe U15 senses an excessive voltage, the diode D2 conducts and limits the voltage. The resistor R59 filters the input voltage signal, and after filtering out the interference signals, it is divided into two paths. Through the cooperation of the components in the two paths, the input signal of path A where the resistor R58 is located is amplified by two times, and the input signal of path B where the resistor R61 is located is reduced by three times.

[0042] Furthermore, the on-line detection sensor further includes a partial discharge sensor, and the partial discharge sensor includes a partial discharge acquisition circuit;

[0043] The partial discharge acquisition circuit includes ultrasonic sensors U1, U4, U5, capacitors C1, C6, resistors R4, R2, R11, R13, R15 and an amplifier U2A;

[0044] The ultrasonic sensors U1, U4, and U5 are connected in parallel to each other. One end of the capacitor C1 is electrically connected to the positive electrode of the ultrasonic sensor U1, and one end of the capacitor C6 is electrically connected to the negative electrode of the ultrasonic sensor U1. One end of the resistor R4 is electrically connected to the other end of the capacitor C1, and the other end of the resistor R4 is respectively electrically connected to one end of the resistor R2 and the non-inverting input terminal of the amplifier U2A. The other end of the resistor R2 is grounded. One end of the resistor R11 is electrically connected to the other end of the capacitor C6, and the other end of the resistor R11 is respectively electrically connected to one end of the resistor R13, one end of the resistor R15, and the inverting input terminal of the amplifier U2A. The other end of the resistor R13 is grounded, and the other end of the resistor R15 is electrically connected to the output terminal of the amplifier U2A;

[0045] The partial discharge acquisition circuit further includes a capacitor C3, a resistor R9, a resistor R1, a resistor R12, and an amplifier U2B;

[0046] One end of the capacitor C3 is electrically connected to the output terminal of the amplifier U2A, the other end of the capacitor C3 is electrically connected to one end of the resistor R9, the other end of the resistor R9 is respectively electrically connected to one end of the resistor R12 and the inverting input terminal of the amplifier U2B, the other end of the resistor R12 is electrically connected to the output terminal of the amplifier U2B, and the non-inverting input terminal of the amplifier U2B is grounded through the resistor R1;

[0047] The partial discharge acquisition circuit further includes a capacitor C2, a capacitor C7, a resistor R5, a resistor R16, and an amplifier U3A;

[0048] One end of the capacitor C2 is electrically connected to the output terminal of the amplifier U2B, the other end of the capacitor C2 is electrically connected to one end of the resistor R5, the other end of the resistor R5 is respectively electrically connected to the inverting input terminal of the amplifier U3A, one end of the resistor R16, and one end of the capacitor C7. The non-inverting input terminal of the amplifier U3A is grounded, and the output terminal of the amplifier U3A is respectively electrically connected to the other end of the resistor R16 and the other end of the capacitor C7;

[0049] The partial discharge acquisition circuit further includes a capacitor C4, a resistor R3, a resistor R10, a resistor R14, and an amplifier U3B;

[0050] The output terminal of the amplifier U3A is respectively electrically connected to one end of the capacitor C4 and one end of the resistor R3. The other end of the capacitor C4 is grounded, the other end of the resistor R3 is electrically connected to the non-inverting input terminal of the amplifier U3B, the inverting input terminal of the amplifier U3B is respectively electrically connected to one end of the resistor R14 and one end of the resistor R10. The other end of the resistor R14 is grounded, and the other end of the resistor R10 is electrically connected to the output terminal of the amplifier U3B;

[0051] The partial discharge acquisition circuit further includes a capacitor C5, a resistor R6, a resistor R7, a resistor R8, and an analog-to-digital conversion chip U6;

[0052] One end of the resistor R6 is electrically connected to the output terminal of the amplifier U3B. The other end of the resistor R6 is respectively electrically connected to one end of the capacitor C5 and the positive differential analog input pin V+ of the analog-to-digital conversion chip U6. The other end of the capacitor C5 is grounded. The power supply pin VDD of the analog-to-digital conversion chip U6 is respectively electrically connected to one end of the resistor R7, one end of the resistor R8, and the peripheral power supply VCC. The serial clock input pin SCL of the analog-to-digital conversion chip U6 is respectively electrically connected to the other end of the resistor R8 and the terminal block J1. The bidirectional serial data pin SDA of the analog-to-digital conversion chip U6 is respectively electrically connected to the other end of the resistor R7 and the terminal block J1.

[0053] As can be seen from the above description, the three ultrasonic sensors U1, U4, and U5 with different frequency bands are connected in parallel to form an ultrasonic group with a measurement frequency of 20K - 60KHZ; the capacitors C1, C2, C3, and C6 are DC-blocking capacitors to remove the DC component in the signal; the resistors R4 and R11 are current-limiting resistors to protect U2 from being broken down by the ultrasonic group; the resistors R1, R2, and R13 are ground voltage-stabilizing resistors; the amplifier U2A, the resistor R13, and the resistor R15 constitute a first-stage amplification circuit with an amplification factor = 1 + R15 / R13 = 6 times; the amplifier U2B, the resistor R9, and the resistor R12 constitute a second-stage amplification circuit with an amplification factor = 1 + R12 / R9 = 6; the amplifier U3A, the resistor R16, and the resistor R5 constitute a third-stage amplification circuit with an amplification factor = 1 + R16 / R5 = 2 times; the capacitor C7 is a filtering capacitor to ensure a stable output waveform; the capacitor C4 and the resistor R10 form an RC filtering circuit to perform RC filtering on the signal; the amplifier U3B, the resistor R3, and the resistor R10 constitute a fourth-stage amplification circuit with an amplification factor = 1 + R10 / R3 = 201; the resistor R14 is a ground balance resistor. The resistor R6 and the capacitor C5 form an RC filter to protect the analog-to-digital conversion chip U6 from being broken down by the front end and play a filtering role at the same time; the analog signal conversion chip U6 converts the analog signal at the front end into a digital signal for output, where the resistors R7 and R8 are pull-up resistors to improve the driving ability.

[0054] Furthermore, the on-line detection sensor further includes a breaker mechanical characteristic sensor, and the breaker mechanical characteristic sensor includes a current acquisition circuit;

[0055] The current acquisition circuit includes a current transformer U6, a linear optocoupler U12, a capacitor C8, a capacitor C9, a resistor R17, a resistor R18, a resistor R19, a resistor R20, an amplifier U7, and an amplifier U13;

[0056] The negative electrode of the current transformer U6 is grounded. The positive electrode of the current transformer U6 is electrically connected to one end of a resistor R17 and one end of a resistor R20 respectively. The other end of the resistor R20 is grounded. The other end of the resistor R17 is electrically connected to the inverting input terminal of an amplifier U7, the third pin of a linear optocoupler U12, and one end of a capacitor C8 respectively. The non-inverting input terminal of the amplifier U7 is grounded. The other end of the capacitor C8 is electrically connected to the output terminal of the amplifier U7 and one end of a resistor R18 respectively. The other end of the resistor R18 is electrically connected to the first pin of the linear optocoupler U12. The fourth pin of the linear optocoupler U12 is grounded. The second pin of the linear optocoupler U12 is connected to an external power supply VCC. The fifth pin of the linear optocoupler U12 and the non-inverting input terminal of an amplifier U13 are both grounded. The sixth pin of the linear optocoupler U12 is electrically connected to the inverting input terminal of the amplifier U13, one end of a resistor R19, and one end of a capacitor C9 respectively. The output terminal of the amplifier U13 is electrically connected to the other end of the resistor R19, the other end of the capacitor C9, and a terminal block J1 respectively.

[0057] As can be seen from the above description, the current transformer U6 collects the current value of the circuit breaker and inductively outputs a corresponding current in proportion. The linear optocoupler U12, the amplifier U7, the amplifier U8, and the surrounding resistors form an isolated current follower circuit, and the current at the input terminal AD1_IN is equal to the current output by AD1.

[0058] Furthermore, the on-line detection sensor further includes an SF6 micro water density sensor, and the SF6 micro water density sensor includes a dew point acquisition circuit;

[0059] The dew point acquisition circuit includes a light source generation circuit, a mirror condensation condition acquisition circuit, a mirror temperature detection circuit, a refrigeration circuit, and a heating circuit;

[0060] The light source generation circuit includes a resistor R22, a resistor R32, an LED lamp D1 illuminating the mirror, and a triode Q3;

[0061] The MCU chip is electrically connected to one end of the resistor R32. The other end of the resistor R32 is electrically connected to the base of the triode Q3. The emitter of the triode Q3 is grounded. The collector of the triode Q3 is connected to the negative electrode of the LED lamp D1 illuminating the mirror. The LED lamp D1 illuminating the mirror is electrically connected to one end of the resistor R22. The other end of the resistor R22 is connected to an external power supply VCC;

[0062] The mirror condensation condition acquisition circuit includes a photoresistor R28, a resistor R21, a resistor R29, a resistor R55, and an amplifier U11;

[0063] One end of the photosensitive resistor R28 is electrically connected to one end of the resistor R29 and the peripheral power supply VCC respectively. The other end of the photosensitive resistor R28 is electrically connected to one end of the resistor R55 and the non-inverting input terminal of the amplifier U11 respectively. The other end of the resistor R55 is grounded. The other end of the resistor R29 is electrically connected to one end of the resistor R21 and the inverting input terminal of the amplifier U11 respectively. The output terminal of the amplifier U11 is electrically connected to the other end of the resistor R21 and the MCU chip respectively;

[0064] The mirror surface temperature detection circuit includes a thermistor R25 and a resistor R31;

[0065] One end of the resistor R31 is electrically connected to one end of the thermistor R25 and the MCU chip respectively. The other end of the resistor R31 is grounded. The other end of the thermistor R25 is connected to the peripheral power supply VCC;

[0066] The refrigeration circuit includes a thermoelectric cooler P1, a resistor R27 and a field effect transistor Q1;

[0067] The thermoelectric cooler P1 is connected to the LED lamp through a heat conduction tube and shines on the mirror surface D1. One end of the resistor R27 is electrically connected to the MCU chip. The other end of the resistor R27 is electrically connected to the gate of the field effect transistor Q1. The source of the field effect transistor Q1 is grounded. The drain of the field effect transistor Q1 is electrically connected to one end of the thermoelectric cooler P1. The other end of the thermoelectric cooler P1 is connected to the peripheral power supply VCC;

[0068] The heating circuit includes a heating resistor R26, a resistor R30 and a field effect transistor Q2;

[0069] The heating resistor R26 is connected to the LED lamp through a heat conduction tube and shines on the mirror surface D1. One end of the resistor R30 is electrically connected to the MCU chip. The other end of the resistor R30 is electrically connected to the gate of the field effect transistor Q1. The source of the field effect transistor Q1 is grounded. The drain of the field effect transistor Q1 is electrically connected to one end of the heating resistor R26. The other end of the heating resistor R26 is connected to the peripheral power supply VCC.

[0070] As can be seen from the above description, MUC controls the generation of light source by outputting a signal to LED, which is connected to resistor R32, triode Q3, and the LED illuminates mirror D1 and resistor R22; the photoresistor R28, whose resistance is related to the brightness of light, receives the reflected light from the LED illuminating mirror D1. The resistance value of resistor R28 is converted into a voltage value through a circuit composed of resistor R55, resistor R29, resistor R21, resistor R28, and amplifier U11 and then input into MUC by ADC1. The condensation condition of the mirror can be obtained by judging the voltage; MUC forms a refrigeration circuit through resistor R27, field effect transistor Q1, and refrigeration chip P1. The cold end of refrigeration chip P1 is connected to the mirror through a heat conduction tube; the MUC circuit forms a heating circuit through heating resistor R26, field effect transistor Q2, and resistor R30. Heating resistor R26 is connected to the mirror through a heat conduction tube. The MCU controls the temperature of the mirror through the two circuits of heating and refrigeration; the thermistor R25, whose resistance is related to temperature, is located inside the mirror for detecting the mirror temperature. The voltage dividing circuit composed of thermistor R25 and resistor R31 is output to MUC through ADC4, and then the temperature of the mirror is judged.

[0071] Further, the SF6 micro water density sensor further includes a pressure acquisition circuit;

[0072] The pressure acquisition circuit includes resistor R23, resistor R24, resistor R54, and varistor R53;

[0073] One end of resistor R23 is electrically connected to the peripheral power supply VCC and one end of resistor R24 respectively. The other end of resistor R23 is electrically connected to one end of varistor R53 and the MCU chip respectively. The other end of resistor R24 is electrically connected to one end of resistor R54 and the MCU chip respectively. The other ends of varistor R53 and resistor R54 are both grounded.

[0074] As can be seen from the above description, the resistance value of varistor R53 is related to the force applied to the resistor. One side of varistor R53 is the external gas, and the other side is the enclosed gas. At this time, the gas pressure will act on the varistor to make its resistance value related to the gas pressure. Resistor R23, resistor R24, varistor R53, and resistor R54 form a voltage dividing circuit. The current gas pressure can be judged by collecting the outputs of ADC3 and ADC2.

[0075] Further, the background host includes a network port communication circuit;

[0076] The network port communication circuit includes an Ethernet chip U10 and a network port socket RJ1;

[0077] The MCU chip is electrically connected to the Ethernet chip U10, and the Ethernet chip U10 is electrically connected to the network socket RJ1. The on-line detection host is connected to the network through the network port communication circuit to communicate with the background.

[0078] As can be seen from the above description, the function of the Ethernet chip U10 is to convert the RM signal of the MUC into an RJ45 network port signal. RJ1 is the network socket of RJ45. The on-line detection host is connected to the network through this circuit to communicate with the background host.

[0079] Please refer to Figures 1 to 13 As shown in the figure, Embodiment 1 of the present invention is as follows:

[0080] An intelligent on-line monitoring device for a substation provided by the present invention includes a background host 1, an on-line detection host 2, on-line detection sensors 3, and primary equipment 4;

[0081] In this embodiment, as Figure 1 shown, the on-line detection host 2 is electrically connected to the background host 1 and the on-line detection sensors 3 respectively, and the primary equipment 4 is electrically connected to the on-line detection sensors 3;

[0082] The on-line detection host 2 comprehensively processes the status data of the primary equipment 4 collected by the on-line detection sensors 3 and sends it to the background host 1;

[0083] The background host 1 includes a network port communication circuit;

[0084] The on-line detection host 2 includes an MCU and an RS485 communication circuit;

[0085] The on-line detection sensors 3 include GIS live sensors, partial discharge sensors, breaker mechanical characteristic sensors, and SF6 micro water density sensors.

[0086] In this embodiment, as Figure 2 shown, the RS485 communication circuit includes a terminal block J1, resistors R34, R36, R37, R38, R39, R40, R41, R42, TVS diodes D6, D7, bidirectional TVS diode VP1, and transceiver chip U9;

[0087] One end of the resistor R36 is electrically connected to the data transmission end TX of the MCU chip, and the other end of the resistor R36 is electrically connected to the receiver output end RO of the transceiver chip U9. One end of the resistor R42 is electrically connected to the data reception end RX of the MCU chip, and the other end of the resistor R42 is electrically connected to the driver input end RO of the transceiver chip U9. One end of the resistor R38 is connected to the peripheral power supply VCC·3.3V, and the other end of the resistor R38 is electrically connected to the receiver output enable end RE and the driver output enable end DE of the transceiver chip U9 respectively; the non-inverting end A of the transceiver chip U9 is electrically connected to the peripheral power supply VCC·3.3V through the resistor R41, the inverting end B of the transceiver chip U9 is electrically connected to the peripheral power supply VCC·3.3V through the resistor R34, one end of the resistor R39 is electrically connected to the non-inverting end A of the transceiver chip U9, and the other end of the resistor R39 is electrically connected to the negative electrode of the TVS diode D7, one end of the bidirectional TVS diode VP1 and one end of the resistor R40 respectively. The positive electrode of the TVS diode D7 is grounded. One end of the resistor R37 is electrically connected to the inverting end B of the transceiver chip U9, and the other end of the resistor R37 is electrically connected to the negative electrode of the TVS diode D6, one end of the bidirectional TVS diode VP1 and the other end of the resistor R40 respectively. The positive electrode of the TVS diode D6 is grounded. Both ends of the resistor R40 are electrically connected to the terminal block J1;

[0088] In this embodiment, the resistors R37 and R39 are current-limiting resistors for protection. The resistors R34 and R41 pull up RS485A and pull down RS485B to widen the RS485 voltage. The functions of the TVS diode D6, the TVS diode D7 and the bidirectional TVS diode VP1 are lightning protection and surge protection. The on-line detection host and the on-line detection sensor transmit data to each other through this circuit;

[0089] In this embodiment, the model of the transceiver chip is SP3485EN-L / TR, the resistance value of the resistor R34 is 1KΩ, the resistance value of the resistor R36 is 120Ω, the resistance value of the resistor R37 is 10Ω, the resistance value of the resistor R38 is 1KΩ, the resistance value of the resistor R39 is 10Ω, the resistance value of the resistor R40 is 120Ω, the resistance value of the resistor R41 is 1KΩ, the resistance value of the resistor R42 is 120Ω, the model of the terminal block is KF127-2, the models of the TVS diode D6 and the TVS diode D7 are both SMBJ6.8A, and the model of the bidirectional TVS diode VP1 is P6SMB6.8CA.

[0090] In this embodiment, the connection method of the Ethernet chip U10 and the network socket RJ1 of the network port communication circuit is as Figures 3 to 4As shown, the Ethernet chip U10 is electrically connected to the network socket RJ1, converting the RM signal of the MUC into an RJ45 network signal. The on-line detection host 2 is connected to the network through the network communication circuit to communicate with the background host 1;

[0091] In this embodiment, the network socket RJ1 is an RJ45 network socket, and the model of the Ethernet chip U10 is LAN8720A-CP-TR.

[0092] In this embodiment, as Figure 5 shown, the GIS live sensor includes a live detection circuit, and the live detection circuit includes a capacitor C10, a probe U15, resistors R56, R57, R58, R59, R60, R61, R62, R63, R64, amplifiers U14A, U14B and a diode D2;

[0093] One end of the probe U15 is electrically connected to one end of the resistor R60 and one end of the resistor R59 respectively. The other end of the probe U15 is grounded. The other end of the resistor R60 is electrically connected to the negative pole of the diode D2, and the positive pole of the diode D2 is grounded. The other end of the resistor R59 is respectively connected to one end of the resistor R58, one end of the resistor R61 and one end of the resistor R63. The other end of the resistor R63 is grounded. The other end of the resistor R61 is respectively connected to one end of the resistor R64 and one end of the resistor R62. The other end of the resistor R64 is grounded. The other end of the resistor R62 is electrically connected to the non-inverting input terminal of the amplifier U14B. The output terminal of the amplifier U14B is respectively connected to the inverting input terminal of the amplifier U14B and the terminal block J1. The other end of the resistor R58 is electrically connected to the non-inverting input terminal of the amplifier U14A. One end of the resistor R57 is respectively connected to the inverting input terminal of the amplifier U14A, one end of the resistor R56 and one end of the capacitor C10. The output terminal of the amplifier U14A is respectively connected to the other end of the resistor R56, the other end of the capacitor C10 and the terminal block J1;

[0094] In this embodiment, the function of the probe U15 is to sense voltage. The resistors R60 and the diode D2 are used as voltage limiters. When the probe U15 senses an excessive voltage, the diode D2 conducts and limits the voltage. The resistor R59 filters the input voltage signal, filtering out interference signals and dividing them into two paths. Through the cooperation of the components in the two paths, the input signal of path A where the resistor R58 is located is amplified twice, and the input signal of path B where the resistor R61 is located is reduced by three times. The live condition of the GIS is obtained through this circuit and finally the data is transmitted to the on-line detection host through the RS485 circuit;

[0095] In this embodiment, the capacitance value of the capacitor C10 is 100 nF, the model of the probe U15 is GIS-F10, the resistance value of the resistor R56 is 15 KΩ, the resistance value of the resistor R57 is 15 KΩ, the resistance value of the resistor R58 is 1 MΩ, the resistance value of the resistor R59 is 1 MHz / 0R, the resistance value of the resistor R60 is 10 KΩ, the resistance value of the resistor R61 is 2.2 MΩ, the resistance value of the resistor R62 is 1 MΩ, the resistance value of the resistor R63 is 2.2 MΩ, the resistance value of the resistor R64 is 1.3 MΩ, the model of the diode D2 is SMAJ3.3A, and the models of the amplifiers U14A and U14B are both MCP6002.

[0096] In this embodiment, as Figure 6 shown, the partial discharge sensor includes a partial discharge acquisition circuit, and the partial discharge acquisition circuit includes ultrasonic sensors U1, U4, U5, capacitors C1, C2, C3, C4, C5, C6, C7, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, amplifiers U2A, U2B, U3A, U3B, and an analog-to-digital conversion chip U6;

[0097] The ultrasonic sensors U1, U4, and U5 are connected in parallel with each other. One end of the capacitor C1 is electrically connected to the positive electrode of the ultrasonic sensor U1, one end of the capacitor C6 is electrically connected to the negative electrode of the ultrasonic sensor U1, one end of the resistor R4 is electrically connected to the other end of the capacitor C1, and the other end of the resistor R4 is respectively electrically connected to one end of the resistor R2 and the non-inverting input terminal of the amplifier U2A. The other end of the resistor R2 is grounded. One end of the resistor R11 is electrically connected to the other end of the capacitor C6, and the other end of the resistor R11 is respectively electrically connected to one end of the resistor R13, one end of the resistor R15, and the inverting input terminal of the amplifier U2A. The other end of the resistor R13 is grounded. The other end of the resistor R15 is respectively electrically connected to the output terminal of the amplifier U2A and one end of the capacitor C3. The other end of the capacitor C3 is electrically connected to one end of the resistor R9. The other end of the resistor R9 is respectively electrically connected to one end of the resistor R12 and the inverting input terminal of the amplifier U2B. The non-inverting input terminal of the amplifier U2B is grounded through the resistor R1. The other end of the resistor R12 is respectively electrically connected to the output terminal of the amplifier U2B and one end of the capacitor C2. The other end of the capacitor C2 is electrically connected to one end of the resistor R5. The other end of the resistor R5 is respectively electrically connected to the inverting input terminal of the amplifier U3A, one end of the resistor R16, and one end of the capacitor C7. The non-inverting input terminal of the amplifier U3A is grounded. The output terminal of the amplifier U3A is respectively electrically connected to the other end of the resistor R16, the other end of the capacitor C7, one end of the capacitor C4, and one end of the resistor R3. The other end of the capacitor C4 is grounded. The other end of the resistor R3 is electrically connected to the non-inverting input terminal of the amplifier U3B. The inverting input terminal of the amplifier U3B is respectively electrically connected to one end of the resistor R14 and one end of the resistor R10. The other end of the resistor R14 is grounded. The other end of the resistor R10 is respectively electrically connected to the output terminal of the amplifier U3B and one end of the resistor R6. The other end of the resistor R6 is respectively electrically connected to one end of the capacitor C5 and the positive differential analog input pin V+ of the analog-to-digital conversion chip U6. The other end of the capacitor C5 is grounded. The power supply pin VDD of the analog-to-digital conversion chip U6 is respectively electrically connected to one end of the resistor R7, one end of the resistor R8, and the peripheral power supply VCC·3.3V. The serial clock input pin SCL of the analog-to-digital conversion chip U6 is respectively electrically connected to the other end of the resistor R8 and the terminal block J1. The bidirectional serial data pin SDA of the analog-to-digital conversion chip U6 is respectively electrically connected to the other end of the resistor R7 and the terminal block J1;

[0098] In this embodiment, ultrasonic sensors U1, U4, and U5 with three different frequency bands are connected in parallel with each other to form an ultrasonic group with a measurement frequency of 20K - 60KHZ; capacitors C1, C2, C3, and C6 are DC-blocking capacitors to remove the DC component in the signal; resistors R4 and R11 are current-limiting resistors to protect U2 from being broken down by the ultrasonic group; resistors R1, R2, and R13 are ground-stabilizing resistors; amplifier U2A, resistor R13, and resistor R15 constitute a first-stage amplification circuit with an amplification factor = 1 + R15 / R13 = 6 times; amplifier U2B, resistor R9, and resistor R12 constitute a second-stage amplification circuit with an amplification factor = 1 + R12 / R9 = 6; amplifier U3A, resistor R16, and resistor R5 constitute a third-stage amplification circuit with an amplification factor = 1 + R16 / R5 = 2 times; capacitor C7 is a filtering capacitor to ensure a stable output waveform; capacitor C4 and resistor R10 form an RC filtering circuit to perform RC filtering on the signal; amplifier U3B, resistor R3, and resistor R10 constitute a fourth-stage amplification circuit with an amplification factor = 1 + R10 / R3 = 201; resistor R14 is a ground-balancing resistor. Resistor R6 and capacitor C5 form an RC filter to protect the analog-to-digital conversion chip U6 from being broken down by the front end and also play a filtering role; the analog-to-digital signal conversion chip U6 converts the analog signal at the front end into a digital signal for output, where resistors R7 and R8 are pull-up resistors to improve the driving ability;

[0099] In this embodiment, the model of the ultrasonic sensor U1 is NU40C10R, the model of the ultrasonic sensor U2 is NU25C10R, the model of the ultrasonic sensor U3 is NU60C10R, the capacitance values of capacitors C1, C2, C3, C4, C5, C6, and C7 are all 100nF, the resistance value of resistor R1 is 10KΩ, the resistance value of resistor R2 is 20KΩ, the resistance value of resistor R3 is 1KΩ, the resistance value of resistor R4 is 10KΩ, the resistance value of resistor R5 is 10KΩ, the resistance value of resistor R6 is 100Ω, the resistance value of resistor R7 is 10KΩ, the resistance value of resistor R8 is 10KΩ, the resistance value of resistor R9 is 2KΩ, the resistance value of resistor R10 is 200KΩ, the resistance value of resistor R11 is 10KΩ, the resistance value of resistor R12 is 10KΩ, the resistance value of resistor R13 is 20KΩ, the resistance value of resistor R14 is 2KΩ, the resistance value of resistor R15 is 100KΩ, and the resistance value of resistor R16 is 10KΩ.

[0100] In this embodiment, as Figure 7 shown, the breaker mechanical characteristic sensor includes a current acquisition circuit, and the current acquisition circuit includes a current transformer U6, a linear optocoupler U12, capacitors C8, C9, resistors R17, R18, R19, R20, an amplifier U7, and an amplifier U13;

[0101] The negative electrode of the current transformer U6 is grounded. The positive electrode of the current transformer U6 is electrically connected to one end of a resistor R17 and one end of a resistor R20 respectively. The other end of the resistor R20 is grounded. The other end of the resistor R17 is electrically connected to the inverting input terminal of an amplifier U7, the third pin of a linear optocoupler U12, and one end of a capacitor C8 respectively. The non-inverting input terminal of the amplifier U7 is grounded. The other end of the capacitor C8 is electrically connected to the output terminal of the amplifier U7 and one end of a resistor R18 respectively. The other end of the resistor R18 is electrically connected to the first pin of the linear optocoupler U12. The fourth pin of the linear optocoupler U12 is grounded. The second pin of the linear optocoupler U12 is connected to an external power supply VCC·5V. The fifth pin of the linear optocoupler U12 and the non-inverting input terminal of an amplifier U13 are both grounded. The sixth pin of the linear optocoupler U12 is electrically connected to the inverting input terminal of the amplifier U13, one end of a resistor R19, and one end of a capacitor C9 respectively. The output terminal of the amplifier U13 is electrically connected to the other end of the resistor R19, the other end of the capacitor C9, and a terminal block J1 respectively;

[0102] In this embodiment, the current transformer U6 collects the current value of the circuit breaker and inductively outputs a corresponding current in proportion. The linear optocoupler U12 and the amplifier U7, the amplifier U8 and the surrounding resistors form an isolated current follower circuit, and the current at its input terminal AD1_IN is equal to the current output by AD1;

[0103] In this embodiment, the model of the current transformer U6 is CDK-80, the models of the amplifier U7 and the amplifier U13 are both SGM8041, the model of the linear optocoupler U12 is HCNR200, the capacitance value of the capacitor C8 is 10 nF, the capacitance value of the capacitor C9 is 10 nF, the resistance value of the resistor R17 is 30 KΩ, the resistance value of the resistor R18 is 220 Ω, the resistance value of the resistor R19 is 30 KΩ, and the resistance value of the resistor R2 is 150 Ω.

[0104] In this embodiment, as Figures 8 to 12 shown, the SF6 micro water density sensor includes a dew point acquisition circuit, and the dew point acquisition circuit includes a light source generation circuit, a mirror condensation condition acquisition circuit, a mirror temperature detection circuit, a refrigeration circuit, and a heating circuit;

[0105] In this embodiment, as Figure 8 shown, the light source generation circuit includes a resistor R22, a resistor R32, an LED lamp D1 illuminating the mirror, and a triode Q3;

[0106] The MCU chip is electrically connected to one end of the resistor R32. The other end of the resistor R32 is electrically connected to the base of the triode Q3. The emitter of the triode Q3 is grounded. The collector of the triode Q3 is connected to the negative electrode of the LED light illuminating the mirror D1. The LED light illuminating the mirror D1 is electrically connected to one end of the resistor R22. The other end of the resistor R22 is connected to the external power supply VCC·3.3V;

[0107] In this embodiment, the resistance value of the resistor R22 is 5.1KΩ, the resistance value of the resistor R32 is 5.1KΩ, and the model of the triode Q3 is MMBT3904;

[0108] In this embodiment, as Figure 9 shown, the mirror dew condition acquisition circuit includes a photoresistor R28, a resistor R21, a resistor R29, a resistor R55, and an amplifier U11;

[0109] One end of the photoresistor R28 is electrically connected to one end of the resistor R29 and the external power supply VCC·3.3V respectively. The other end of the photoresistor R28 is electrically connected to one end of the resistor R55 and the non-inverting input terminal of the amplifier U11 respectively. The other end of the resistor R55 is grounded. The other end of the resistor R29 is electrically connected to one end of the resistor R21 and the inverting input terminal of the amplifier U11 respectively. The output terminal of the amplifier U11 is electrically connected to the other end of the resistor R21 and the MCU chip respectively;

[0110] In this embodiment, the initial resistance value of the photoresistor R28 is 1MΩ, the resistance value of the resistor R21 is 1MΩ, the resistance value of the resistor R29 is 1MΩ, the resistance value of the resistor R55 is 1MΩ, and the model of the amplifier U11 is LMV321IDBVRG4;

[0111] In this embodiment, as Figure 10 shown, the mirror temperature detection circuit includes a thermistor R25 and a resistor R31;

[0112] One end of the resistor R31 is electrically connected to one end of the thermistor R25 and the MCU chip respectively. The other end of the resistor R31 is grounded. The other end of the thermistor R25 is connected to the external power supply VCC·3.3V;

[0113] In this embodiment, the initial resistance value of the thermistor R25 is 10KΩ, and the resistance value of the resistor R31 is 10KΩ;

[0114] In this embodiment, as Figure 11 shown, the refrigeration circuit includes a thermoelectric cooler P1, a resistor R27, and a field effect transistor Q1;

[0115] The thermoelectric cooler P1 is connected to the LED lamp through a heat conduction tube to illuminate the mirror surface D1. One end of the resistor R27 is electrically connected to the MCU chip, and the other end of the resistor R27 is electrically connected to the gate of the field effect transistor Q1. The source of the field effect transistor Q1 is grounded, and the drain of the field effect transistor Q1 is electrically connected to one end of the thermoelectric cooler P1. The other end of the thermoelectric cooler P1 is connected to the external power supply VCC·12V;

[0116] In this embodiment, the resistance value of the resistor R27 is 100Ω, and the model of the field effect transistor Q1 is 2N7002;

[0117] In this embodiment, as Figure 12 shown, the heating circuit includes a heating resistor R26, a resistor R30, and a field effect transistor Q2;

[0118] The heating resistor R26 is connected to the LED lamp through a heat conduction tube to illuminate the mirror surface D1. One end of the resistor R30 is electrically connected to the MCU chip, and the other end of the resistor R30 is electrically connected to the gate of the field effect transistor Q1. The source of the field effect transistor Q1 is grounded, and the drain of the field effect transistor Q1 is electrically connected to one end of the heating resistor R26. The other end of the heating resistor R26 is connected to the external power supply VCC·12V;

[0119] In this embodiment, the resistance value of the heating resistor R26 is 10Ω, the resistance value of the resistor R30 is 100Ω, and the model of the field effect transistor Q2 is 2N7002;

[0120] In this embodiment, the MUC controls the generation of light sources by outputting signals to the resistor R32, the triode Q3, the LED lamp illuminating the mirror surface D1, and the resistor R22; the photosensitive resistor R28, whose resistance value is related to the brightness of light, receives the reflected light of the LED lamp illuminating the mirror surface D1, and converts the resistance value of the resistor R28 into a voltage value through the circuit composed of the resistor R55, the resistor R29, the resistor R21, the resistor R28, and the amplifier U11, and then inputs it into the MUC through the ADC1. By judging the voltage, the condensation situation of the mirror surface can be obtained; the MUC forms a refrigeration circuit through the resistor R27, the field effect transistor Q1, and the thermoelectric cooler P1, and the cold end of the thermoelectric cooler P1 is connected to the mirror surface through a heat conduction tube; the MUC circuit forms a heating circuit through the heating resistor R26, the field effect transistor Q2, and the resistor R30, and the heating resistor R26 is connected to the mirror surface through a heat conduction tube. The MCU controls the temperature of the mirror surface through the two circuits of heating and refrigeration; the thermistor R25, whose resistance value is related to the temperature, is located inside the mirror surface for detecting the temperature of the mirror surface. The voltage dividing circuit composed of the thermistor R25 and the resistor R31 outputs to the MUC through the ADC4, and then judges the temperature of the mirror surface.

[0121] In this embodiment, as Figure 13 shown, the SF6 micro water density sensor further includes a pressure acquisition circuit;

[0122] The pressure acquisition circuit includes a resistor R23, a resistor R24, a resistor R54, and a varistor R53;

[0123] One end of the resistor R23 is electrically connected to the external power supply VCC·3.3V and one end of the resistor R24 respectively. The other end of the resistor R23 is electrically connected to one end of the varistor R53 and the MCU chip respectively. The other end of the resistor R24 is electrically connected to one end of the resistor R54 and the MCU chip respectively. The other ends of the varistor R53 and the resistor R54 are both grounded;

[0124] In this embodiment, the initial resistance value of the varistor R53 is 120Ω, and the resistance values of the resistor R23, the resistor R24, and the resistor R54 are all 120Ω;

[0125] In this embodiment, the resistance value of the varistor R53 is related to the force received by the resistor. One side of the varistor R53 is the external gas, and the other side is the enclosed gas. At this time, the gas pressure will act on the varistor to make its resistance value related to the gas pressure. The resistor R23, the resistor R24, the varistor R53, and the resistor R54 form a voltage division circuit. By collecting the outputs of ADC3 and ADC2, the current gas pressure can be judged.

[0126] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. An intelligent online monitoring device for a substation, characterized in that: Including background host, online detection host, online detection sensor and primary equipment; The online detection host is electrically connected to the background host and the online detection sensor respectively, and the primary device is electrically connected to the online detection sensor; The online detection host performs comprehensive processing on the status data of the primary equipment collected by the online detection sensor and sends it to the background host; The online detection host includes an MCU chip and an RS485 communication circuit; The MCU chip is electrically connected to the RS485 communication circuit; The RS485 communication circuit includes a terminal block J1, a resistor R34, a resistor R36, a resistor R37, a resistor R38, a resistor R39, a resistor R40, a resistor R41, a resistor R42, a TVS diode D6, a TVS diode D7, a bidirectional TVS diode VP1 and a transceiver chip U9; One end of the resistor R36 is electrically connected to the data transmitting terminal TX of the MCU chip, the other end of the resistor R36 is electrically connected to the receiver output terminal RO of the transceiver chip U9, one end of the resistor R42 is electrically connected to the data receiving terminal RX of the MCU chip, the other end of the resistor R42 is electrically connected to the driver input terminal RO of the transceiver chip U9, one end of the resistor R38 is connected to the external power supply VCC, and the other end of the resistor R38 is electrically connected to the receiver output enable terminal RE and the driver output enable terminal DE of the transceiver chip U9 respectively; The in-phase terminal A of the transceiver chip U9 is electrically connected to the external power supply VCC through the resistor R41, the in-phase terminal B of the transceiver chip U9 is electrically connected to the external power supply VCC through the resistor R34, one end of the resistor R39 is electrically connected to the in-phase terminal A of the transceiver chip U9, the other end of the resistor R39 is electrically connected to the cathode of the TVS diode D7, one end of the bidirectional TVS diode VP1 and one end of the resistor R40 respectively, the anode of the TVS diode D7 is grounded, one end of the resistor R37 is electrically connected to the in-phase terminal B of the transceiver chip U9, the other end of the resistor R37 is electrically connected to the cathode of the TVS diode D6, one end of the bidirectional TVS diode VP1 and the other end of the resistor R40 respectively, the anode of the TVS diode D6 is grounded, and the two ends of the resistor R40 are electrically connected to the terminal block J1.

2. The intelligent online monitoring device for substation according to claim 1, characterized in that: The online detection sensor includes a GIS charged sensor; The GIS charged sensor includes a charged detection circuit, which includes a capacitor C10, a probe U15, a resistor R56, a resistor R57, a resistor R58, a resistor R59, a resistor R60, a resistor R61, a resistor R62, a resistor R63, a resistor R64, an amplifier U14A, an amplifier U14B and a diode D2; One end of the probe U15 is electrically connected to one end of the resistor R60 and one end of the resistor R59 respectively, the other end of the probe U15 is grounded, the other end of the resistor R60 is electrically connected to the cathode of the diode D2, the anode of the diode D2 is grounded, the other end of the resistor R59 is electrically connected to one end of the resistor R58, one end of the resistor R61 and one end of the resistor R63 respectively, the other end of the resistor R63 is grounded, the other end of the resistor R61 is electrically connected to one end of the resistor R64 and one end of the resistor R62 respectively, the other end of the resistor R64 is grounded, The other end of the resistor R62 is electrically connected to the non-inverting input terminal of the amplifier U14B, and the output terminal of the amplifier U14B is electrically connected to the inverting input terminal of the amplifier U14B and the terminal block J1 respectively. The other end of the resistor R58 is electrically connected to the non-inverting input terminal of the amplifier U14A, and one end of the resistor R57 is electrically connected to the inverting input terminal of the amplifier U14A, one end of the resistor R56 and one end of the capacitor C10 respectively. The output terminal of the amplifier U14A is electrically connected to the other end of the resistor R56, the other end of the capacitor C10 and the terminal block J1 respectively.

3. The intelligent online monitoring device for substation according to claim 2, characterized in that: The online detection sensor also includes a partial discharge sensor, and the partial discharge sensor includes a partial discharge acquisition circuit; The partial discharge acquisition circuit includes an ultrasonic sensor U1, an ultrasonic sensor U4, an ultrasonic sensor U5, a capacitor C1, a capacitor C6, a resistor R4, a resistor R2, a resistor R11, a resistor R13, a resistor R15 and an amplifier U2A; The ultrasonic sensor U1, ultrasonic sensor U4 and ultrasonic sensor U5 are connected in parallel with each other, one end of the capacitor C1 is electrically connected to the positive electrode of the ultrasonic sensor U1, one end of the capacitor C6 is electrically connected to the negative electrode of the ultrasonic sensor U1, one end of the resistor R4 is electrically connected to the other end of the capacitor C1, the other end of the resistor R4 is electrically connected to one end of the resistor R2 and the non-inverting input end of the amplifier U2A, the other end of the resistor R2 is grounded, one end of the resistor R11 is electrically connected to the other end of the capacitor C6, the other end of the resistor R11 is electrically connected to one end of the resistor R13, one end of the resistor R15 and the inverting input end of the amplifier U2A, the other end of the resistor R13 is grounded, and the other end of the resistor R15 is electrically connected to the output end of the amplifier U2A; The partial discharge acquisition circuit also includes a capacitor C3, a resistor R9, a resistor R1, a resistor R12 and an amplifier U2B; One end of the capacitor C3 is electrically connected to the output end of the amplifier U2A, the other end of the capacitor C3 is electrically connected to one end of the resistor R9, the other end of the resistor R9 is electrically connected to one end of the resistor R12 and the inverting input end of the amplifier U2B respectively, the other end of the resistor R12 is electrically connected to the output end of the amplifier U2B, and the non-inverting input end of the amplifier U2B is grounded through the resistor R1; The partial discharge acquisition circuit also includes a capacitor C2, a capacitor C7, a resistor R5, a resistor R16 and an amplifier U3A; One end of the capacitor C2 is electrically connected to the output end of the amplifier U2B, the other end of the capacitor C2 is electrically connected to one end of the resistor R5, the other end of the resistor R5 is electrically connected to the inverting input end of the amplifier U3A, one end of the resistor R16 and one end of the capacitor C7 respectively, the non-inverting input end of the amplifier U3A is grounded, and the output end of the amplifier U3A is electrically connected to the other end of the resistor R16 and the other end of the capacitor C7 respectively; The partial discharge acquisition circuit also includes a capacitor C4, a resistor R3, a resistor R10, a resistor R14 and an amplifier U3B; The output end of the amplifier U3A is electrically connected to one end of the capacitor C4 and one end of the resistor R3 respectively, the other end of the capacitor C4 is grounded, the other end of the resistor R3 is electrically connected to the non-inverting input end of the amplifier U3B, the inverting input end of the amplifier U3B is electrically connected to one end of the resistor R14 and one end of the resistor R10 respectively, the other end of the resistor R14 is grounded, and the other end of the resistor R10 is electrically connected to the output end of the amplifier U3B; The partial discharge acquisition circuit also includes a capacitor C5, a resistor R6, a resistor R7, a resistor R8 and an analog-to-digital conversion chip U6; One end of the resistor R6 is electrically connected to the output end of the amplifier U3B, the other end of the resistor R6 is electrically connected to one end of the capacitor C5 and the positive differential analog input pin V+ of the analog-to-digital conversion chip U6, the other end of the capacitor C5 is grounded, the power pin VDD of the analog-to-digital conversion chip U6 is electrically connected to one end of the resistor R7, one end of the resistor R8 and the external power supply VCC, the serial clock input pin SCL of the analog-to-digital conversion chip U6 is electrically connected to the other end of the resistor R8 and the terminal block J1, and the bidirectional serial data pin SDA of the analog-to-digital conversion chip U6 is electrically connected to the other end of the resistor R7 and the terminal block J1.

4. The intelligent online monitoring device for substation according to claim 2, characterized in that: The online detection sensor also includes a circuit breaker mechanical characteristic sensor, and the circuit breaker mechanical characteristic sensor includes a current acquisition circuit; The current acquisition circuit includes a current transformer U6, a linear optocoupler U12, a capacitor C8, a capacitor C9, a resistor R17, a resistor R18, a resistor R19, a resistor R20, an amplifier U7 and an amplifier U13; The negative electrode of the current transformer U6 is grounded, the positive electrode of the current transformer U6 is electrically connected to one end of the resistor R17 and one end of the resistor R20 respectively, the other end of the resistor R20 is grounded, the other end of the resistor R17 is electrically connected to the inverting input end of the amplifier U7, the third pin of the linear optocoupler U12 and one end of the capacitor C8 respectively, the non-inverting input end of the amplifier U7 is grounded, the other end of the capacitor C8 is electrically connected to the output end of the amplifier U7 and one end of the resistor R18 respectively, the other end of the resistor R18 is electrically connected to the linear The first pin of the optocoupler U12 is electrically connected, the fourth pin of the linear optocoupler U12 is grounded, the second pin of the linear optocoupler U12 is connected to the external power supply VCC, the fifth pin of the linear optocoupler U12 and the non-inverting input terminal of the amplifier U13 are both grounded, the sixth pin of the linear optocoupler U12 is electrically connected to the inverting input terminal of the amplifier U13, one end of the resistor R19 and one end of the capacitor C9, respectively, and the output end of the amplifier U13 is electrically connected to the other end of the resistor R19, the other end of the capacitor C9 and the terminal block J1, respectively.

5. The intelligent online monitoring device for substation according to claim 2, characterized in that: The online detection sensor also includes a SF6 micro-water density sensor, and the SF6 micro-water density sensor includes a dew point acquisition circuit; The dew point collection circuit includes a light source generation circuit, a mirror condensation situation collection circuit, a mirror temperature detection circuit, a cooling circuit and a heating circuit; The light source generating circuit includes a resistor R22, a resistor R32, an LED light directed toward a mirror surface D1 and a transistor Q3; The MCU chip is electrically connected to one end of the resistor R32, the other end of the resistor R32 is electrically connected to the base of the transistor Q3, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the negative electrode of the LED light shining on the mirror D1, the LED light shining on the mirror D1 is electrically connected to one end of the resistor R22, and the other end of the resistor R22 is connected to the external power supply VCC; The mirror condensation condition collection circuit includes a photoresistor R28, a resistor R21, a resistor R29, a resistor R55 and an amplifier U11; One end of the photoresistor R28 is electrically connected to one end of the resistor R29 and the external power supply VCC, respectively; the other end of the photoresistor R28 is electrically connected to one end of the resistor R55 and the non-inverting input end of the amplifier U11, respectively; the other end of the resistor R55 is grounded; the other end of the resistor R29 is electrically connected to one end of the resistor R21 and the inverting input end of the amplifier U11, respectively; the output end of the amplifier U11 is electrically connected to the other end of the resistor R21 and the MCU chip, respectively; The mirror temperature detection circuit includes a temperature-sensitive resistor R25 and a resistor R31; One end of the resistor R31 is electrically connected to one end of the temperature-sensitive resistor R25 and the MCU chip respectively, the other end of the resistor R31 is grounded, and the other end of the temperature-sensitive resistor R25 is connected to the external power supply VCC; The refrigeration circuit includes a refrigeration plate P1, a resistor R27 and a field effect transistor Q1; The cooling plate P1 is connected to an LED light through a heat pipe to illuminate the mirror D1, one end of the resistor R27 is electrically connected to the MCU chip, the other end of the resistor R27 is electrically connected to the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is grounded, the drain of the field effect transistor Q1 is electrically connected to one end of the cooling plate P1, and the other end of the cooling plate P1 is connected to the external power supply VCC; The heating circuit includes a heating resistor R26, a resistor R30 and a field effect transistor Q2; The heating resistor R26 is connected to the LED light toward the mirror D1 through a heat pipe, one end of the resistor R30 is electrically connected to the MCU chip, the other end of the resistor R30 is electrically connected to the gate of the field effect transistor Q1, the source of the field effect transistor Q1 is grounded, the drain of the field effect transistor Q1 is electrically connected to one end of the heating resistor R26, and the other end of the heating resistor R26 is connected to the external power supply VCC.

6. The intelligent online monitoring device for substation according to claim 5, characterized in that: The SF6 micro-water density sensor also includes a pressure acquisition circuit; The pressure acquisition circuit includes a resistor R23, a resistor R24, a resistor R54 and a piezoresistor R53; One end of the resistor R23 is electrically connected to the external power supply VCC and one end of the resistor R24 ​​respectively, the other end of the resistor R23 is electrically connected to one end of the varistor R53 and the MCU chip respectively, the other end of the resistor R24 ​​is electrically connected to one end of the resistor R54 and the MCU chip respectively, and the other end of the varistor R53 and the other end of the resistor R54 are both grounded.

7. The intelligent online monitoring device for substation according to claim 1, characterized in that: The background host includes a network port communication circuit; The network port communication circuit includes an Ethernet chip U10 and a network port socket RJ1; The MCU chip is electrically connected to the Ethernet chip U10, the Ethernet chip U10 is electrically connected to the network port socket RJ1, and the online detection host is connected to the network and the background communication through the network port communication circuit.

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