CN110601361A - Grounding current on-line monitoring terminal - Google Patents
Grounding current on-line monitoring terminal Download PDFInfo
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- CN110601361A CN110601361A CN201910859703.2A CN201910859703A CN110601361A CN 110601361 A CN110601361 A CN 110601361A CN 201910859703 A CN201910859703 A CN 201910859703A CN 110601361 A CN110601361 A CN 110601361A
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- 238000005070 sampling Methods 0.000 claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 28
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 15
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- 235000015429 Mirabilis expansa Nutrition 0.000 claims description 5
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- 101150091950 retn gene Proteins 0.000 claims description 3
- 238000012502 risk assessment Methods 0.000 abstract description 5
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Abstract
The invention discloses a grounding current on-line monitoring terminal, which comprises a current sampling unit, a control unit, a storage unit, a power supply unit, a remote communication unit and a display unit, wherein: the power supply unit supplies power to each unit; the current sampling unit samples grounding current and is electrically connected with the control unit; the storage unit stores statistical data and terminal operation parameters and is in bidirectional electrical connection with the control unit; the remote communication unit is in bidirectional electric connection with the control unit, so that the terminal and the background can interact data; and the display unit is electrically connected with the control unit and displays the real-time terminal state and data. The current sampling unit is used for sampling the grounding current and transmitting the sampled data to the control unit, the control unit processes the data to obtain the actual grounding current, the data is interacted with the background through the remote communication unit, the real-time system state and data are displayed on the display unit, and meanwhile the storage unit stores statistical data and operating parameters for subsequent risk assessment.
Description
Technical Field
The invention relates to the field of current monitoring, in particular to an on-line ground current monitoring terminal.
Background
The low-voltage distribution network has the electrical leakage risk widely, is difficult to find when single-phase ground connection leakage fault occurs, and easily causes the personal electric shock casualty accident when equipment runs with a disease. When the research finds that the leakage faults occur to lines and equipment in the power supply range of the transformer area, the fault current can form a loop through the ground and flow back to the distribution transformer neutral point, and therefore the leakage faults can be effectively found by carrying out online monitoring on the grounding pole current of the distribution transformer neutral point.
A project team plans to develop a leakage current online monitoring device, collects relevant current data, and the data are statistically analyzed and uploaded to a cloud platform in real time, so that the total leakage situation of a transformer area is evaluated, power distribution operation and maintenance personnel can conveniently and timely carry out targeted monitoring, collection and troubleshooting until the leakage fault hidden danger is eliminated, and the electric shock risk of social personnel is effectively controlled.
Disclosure of Invention
The invention provides an on-line grounding current monitoring terminal which is used for monitoring grounding electrode current of a distribution transformer neutral point.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a ground current on-line monitoring terminal, includes current sampling unit, the control unit, memory cell, power supply unit, remote communication unit, display element, wherein:
the power supply unit supplies power to each unit;
the current sampling unit samples grounding current and is electrically connected with the control unit;
the storage unit stores statistical data and terminal operation parameters and is in bidirectional electrical connection with the control unit;
the remote communication unit is in bidirectional electric connection with the control unit, so that the terminal and the background can interact data;
and the display unit is electrically connected with the control unit and displays the real-time terminal state and data.
The current sampling unit is responsible for sampling grounding current; the storage unit is used for storing statistical data and operation parameters; the power supply unit is responsible for supplying power to each unit; the remote communication unit is used for the terminal to interact data with the background; the display unit displays real-time system state and data.
Preferably, the power supply unit converts 220V alternating current into 5V and 3.3V direct current, and comprises a thermistor RZ2, a voltage dependent resistor RV1, a capacitor C9, an AC-DC module HQ05P10LRN, a magnetic bead L3, a magnetic bead L4, a bidirectional TVS tube TVS3, a unidirectional TVS4, a low dropout regulator LR1118-33AA3-AR, an electrolytic capacitor C10, a capacitor C12, a capacitor C62, an electrolytic capacitor C64 and an electrolytic capacitor C65, wherein:
the live wire is electrically connected with one end of a thermistor RZ2, the other end of the thermistor RZ2 is electrically connected with one end of a piezoresistor RV1, one end of a capacitor C9 and the AC (L) end of an AC-DC module HQ05P10LRN respectively, and the other end of the piezoresistor RV1, the other end of the capacitor C9 and the AC (N) end of the AC-DC module HQ05P10LRN are electrically connected with a zero line;
the GND end of the AC-DC module HQ05P10LRN is electrically connected with one end of a magnetic bead L3, the Vo + end of the AC-DC module HQ05P10LRN is electrically connected with one end of a magnetic bead L4, the other end of the magnetic bead L3 is electrically connected with one end of a TVS3 of a bidirectional TVS tube, the negative electrode of an electrolytic capacitor and one end of a capacitor C12 respectively, and the other end of the magnetic bead L4 is electrically connected with the other end of a TVS3 of the bidirectional TVS tube, the positive electrode of the electrolytic capacitor and the other end of the capacitor C12 respectively and outputs 5V direct current;
the constant-current source voltage stabilizer comprises a Vin end and one end of a capacitor C62, wherein 5V direct current is input into a low-voltage-difference voltage stabilizer LR1118-33AA3-AR, a Vout end of the low-voltage-difference voltage stabilizer LR1118-33AA3-AR is electrically connected with the anode of an electrolytic capacitor C64, one end of a capacitor C65 and one end of a unidirectional TVS4 respectively and outputs 3.3V direct current, and the other end of the capacitor C62, the GND end of the low-voltage-difference voltage stabilizer LR1118-33AA3-AR, the cathode of the electrolytic capacitor C64, the other end of a capacitor C65 and the other end of the unidirectional TVS4 are all grounded;
the power supply unit converts 220V alternating current into 5V and 3.3V direct current, and provides the direct current for each unit of the system.
220V alternating current is input through L, N, a thermistor RZ2 is used for current limiting protection, a piezoresistor RV1 is used for voltage limiting protection, and C9 is a safety capacitor. L3 and L4 are magnetic beads and are used for filtering; c10 and C12 are capacitors and are also used for filtering; the TVS3 is a TVS tube for protection. The low dropout voltage regulator converts 5V into 3.3V for the use of a control unit, a display unit, a storage unit, a current sampling unit and the like. The telecommunications module uses a 5V power supply.
Preferably, the control unit comprises a Cortex-M4 microcontroller STM32F405RGT6, a crystal oscillator Y3, a resistor R21, a capacitor C37, a resistor R22, a capacitor C42, a capacitor C43, a capacitor C44, a capacitor C45, a capacitor C46, a capacitor C48, a capacitor C1, a capacitor C53, a capacitor C41, a capacitor C98, a capacitor C99, wherein:
the control unit main control chip is a Cortex-M4 microcontroller, is externally connected with an 8MHz crystal oscillator, and is provided with a power supply filter capacitor consisting of a capacitor C42, a capacitor C43, a capacitor C44, a capacitor C45, a capacitor C46 and a capacitor C48;
a VDD19 end, a VDD32 end, a VDD48 end, a VDD64 end, a VBA1 end, and a VDDA/REF + end of the STM32F405RGT6 are all electrically connected to 3.3V direct current provided by the power supply unit, an OSC _ IN end is respectively electrically connected to one end of a crystal oscillator Y3 and one end of a capacitor C98, an OSC _ OUT end is respectively electrically connected to the other end of the crystal oscillator Y3 and one end of a capacitor C99, the other end of the capacitor C98 and the other end of the capacitor C99 are both grounded, a VCAP2 end is electrically connected to one end of a capacitor C41, a VCAP1 end is electrically connected to one end of a capacitor C53, a PB1 end is electrically connected to one end of a capacitor C1, and the other end of the capacitor C41, the other end of the capacitor C53 and the other;
the 3.3V direct current provided by the power supply unit is also electrically connected with one end of a capacitor C42, one end of a capacitor C43, one end of a capacitor C44, one end of a capacitor C45, one end of a capacitor C46 and one end of a capacitor C48 respectively, and the other end of a capacitor C42, the other end of a capacitor C43, the other end of a capacitor C44, the other end of a capacitor C45, the other end of a capacitor C46 and the other end of a capacitor C48 are all grounded;
the BOOT0 end of the STM32F405RGT6 is electrically connected with one end of a resistor R22, and the other end of the resistor R22 is grounded;
the NRST end of the STM32F405RGT6 is electrically connected with one end of a resistor R21 and one end of a capacitor C37 respectively, the other end of the resistor R21 is electrically connected with 3.3V direct current, and the other end of the capacitor C37 is grounded.
Preferably, the display unit includes a status indicator LED1, a status indicator LED2, a status indicator LED3, a resistor R114, a resistor R115, and a resistor R116, wherein:
the cathode of the status indicator light LED1 is electrically connected with the PB5 end of the STM32F405RGT6, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R114;
the cathode of the status indicator light LED2 is electrically connected with the PB4 end of the STM32F405RGT6, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R115;
the cathode of the status indicator light LED1 is electrically connected with the PB3 end of the STM32F405RGT6, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R116;
the other end of the resistor R114, the other end of the resistor R115 and the other end of the resistor R116 are all electrically connected with 3.3V direct current.
Preferably, the current sampling unit comprises an alternating current sampling chip RN8302B, a current transformer CT1, a 3.3V power supply, a resistor R10, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R24, a resistor R26, a resistor R96, a resistor R97, a resistor R106, a resistor R107, a crystal oscillator Y1, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C25, a capacitor C29, a capacitor C30, a capacitor C33, a capacitor C55, a capacitor C56, a capacitor C91 and a capacitor C92, wherein:
the current transformer CT1 is CT 107M;
the current transformer comprises a grounding current IA + connected with a 2 end of a current transformer CT1, a grounding current IA-connected with a1 end of a current transformer CT1, a3 end of the current transformer CT1 is respectively and electrically connected with one end of a resistor R107 and one end of a resistor R97, a 4 end of the current transformer CT1 is respectively and electrically connected with one end of a resistor R106 and one end of a resistor R96, the other end of a resistor R97 is respectively and electrically connected with one end of a capacitor C92 and an IAN end of an alternating current sampling chip RN8302B, the other end of a resistor R96 is respectively and electrically connected with one end of a capacitor C91 and an IAP end of an alternating current sampling chip RN8302B, and the other ends of the resistor R106, the resistor R107, the capacitor C92 and the capacitor C91 are all grounded;
the RC end, the PM end, the AGND end, the DGND39 end, the DGND29 end and the RA end of the AC sampling chip RN8302B are all grounded, the RB end, the DVCC40 end and the DVCC28 end are all connected with a 3.3V power supply, the SDI end is electrically connected with one end of a resistor R14, the other end of the resistor R14 is electrically connected with a control unit as an SPI interface SPI2_ MOSI, the SCSN end is electrically connected with the control unit as an SPI interface SPI2_ NSS and is also electrically connected with one end of a resistor R8, the other end of a resistor R18 is electrically connected with the 3.3V power supply, the SCLK end is electrically connected with one end of a resistor R16, the other end of a resistor R16 is electrically connected with the control unit as an SPI interface SPI2_ SCK, the SDO end is electrically connected with one end of a resistor 37R 84, the other end of a resistor R15 is electrically connected with the control unit as an SPI interface 2_ O, the RSTN is electrically connected with one end of a resistor 24, the other end of a resistor 46R 48 is electrically connected with one end of a MISFV 3.3V power supply, one end of a capacitor C30 is electrically connected, an XI end is electrically connected with one end of a resistor R26, one end of a capacitor C56 and one end of a crystal oscillator Y1 respectively, an XO end is electrically connected with the other end of a resistor R26, one end of a capacitor C55 and the other end of a crystal oscillator Y1 respectively, and an AVCC end is electrically connected with one end of a capacitor C33, one end of a capacitor C17 and one end of a resistor R17 respectively;
the other end of the resistor R17 is respectively and electrically connected with a 3.3V power supply, one end of a capacitor C14 and one end of a capacitor C25, and the other end of the capacitor C14, the other end of the capacitor C25, the other end of the capacitor C33, the other end of the capacitor C17, the other end of the capacitor C15, the other end of the capacitor C29, the other end of the capacitor C16, the other end of the capacitor C30, the other end of the capacitor C55 and the other end of the capacitor C17 are all grounded;
the current sampling unit is responsible for sampling grounding current, and the current passes through an internal current transformer CT1 of an IA and IA access terminal and is converted into small current suitable for metering through a CT 1; a small current flows through the resistors R106 and R107, and a voltage is generated across the two resistors, respectively; thus converting the current signal into a voltage signal; the voltage signal is connected to current sampling ports IAP and IAN of the alternating current sampling chip RN 8302B; the alternating current sampling chip RN8302B samples the voltage value converted by the current; the control unit communicates with the current sampling chip through SPI interfaces (SPI2_ MOSI, SPI2_ MISO, SPI2_ NSS and SPI2_ SCK), the sampled voltage value is also sent to the control unit through the SPI interface, and the voltage value is converted into an actual current value by the control unit.
Preferably, the remote communication unit comprises a remote communication chip N10, a voltage regulator MIC29302, a resistor R1, a resistor R5, an electrolytic capacitor DC4, a capacitor C4, an electrolytic capacitor DC5, a capacitor C5, a capacitor C9, a capacitor C12, a SIMCARD chip, a capacitor C10, a capacitor C15, a resistor R34, a capacitor C14, a resistor R11, a transistor Q2, a resistor R12, a capacitor C2, a transistor Q3, a resistor R3, a capacitor C3, a resistor R4, a capacitor C17, a resistor R13, a resistor R14, a transistor Q6 and a capacitor C8, wherein:
the power supply unit provides 5V direct current to an Input end of a voltage regulator MIC 29302;
an Enable end of the voltage regulator MIC29302 is electrically connected with the control unit, an Input end is electrically connected with an anode of an electrolytic capacitor DC4 and one end of a capacitor C4 respectively, an Output end is electrically connected with an anode of an electrolytic capacitor DC5, one end of a capacitor C5, one end of a resistor R5, a VBAT2 end of a telecommunication chip N10, a VBAT3 end of a telecommunication chip N10 and a VBAT4 end of a telecommunication chip N10 respectively, an Adjust end is electrically connected with one end of a resistor R1 and the other end of a resistor R5 respectively, and a cathode of an electrolytic capacitor DC4, the other end of a capacitor C4, a cathode of an electrolytic capacitor DC5, the other end of a capacitor C5 and the other end of a resistor R1 are electrically connected;
the VCC end of the SIMCARD chip is electrically connected with one end of a capacitor C15 and one end of a capacitor C10 respectively, the RST end is electrically connected with one end of a capacitor C9 and the SIM _ RST end of a telecommunication chip N10 respectively, the CLK end is electrically connected with one end of a capacitor C12 and the SIM _ CLK end of a telecommunication chip N10 respectively, the GND end is electrically connected with the other end of a capacitor C10 and the other end of a capacitor C15 respectively, the IO end is electrically connected with one end of a capacitor C14, one end of a resistor R34 and the SIM _ IO end of a telecommunication chip N10 respectively, the other end of a resistor R34 is electrically connected with the SIM _ VDD end of the telecommunication chip N10, and the other end of a capacitor C9, the other end of a capacitor C12 and the other end of a capacitor C14 are;
the Output end of the voltage regulator MIC29302 is also electrically connected with one end of a resistor R11, the other end of a resistor R11 is electrically connected with an RXD-GPRS end of the control unit and a collector of a triode Q2, an emitter of the triode Q2 is electrically connected with a UTXD end of the control unit, a base of the triode Q2 is respectively and electrically connected with one end of a resistor R12 and one end of a capacitor C2, and the other end of the resistor R12 and the other end of the capacitor C2 are electrically connected with a VIO28 end of a remote communication chip N10;
the VIO28 end of the remote communication chip N10 is also electrically connected with one end of a resistor R3, one end of a capacitor C3 and one end of a resistor R4, the other end of a resistor R3 and the other end of a capacitor C3 are both electrically connected with the base electrode of a triode Q3, the emitter electrode of the triode Q3 is electrically connected with the TXD-GPRS end of the control unit, and the collector electrode of the triode Q3 is respectively electrically connected with the URXD end of the control unit and the other end of the resistor R4;
the Output end of the voltage regulator MIC29302 is also electrically connected with one end of a capacitor C17, and the other end of the capacitor C17 is grounded;
the ON/OFF-GPRS end of the control unit is electrically connected with one end of a resistor R13, the other end of the resistor R13 is electrically connected with one end of a resistor R14 and the base electrode of a triode Q6 respectively, the collector electrode of the triode Q6 is electrically connected with the ON/OFF end of a remote communication chip N10 and one end of a capacitor C8 respectively, and the other end of the resistor R14, the emitter electrode of the triode Q6 and the other end of the capacitor C8 are electrically connected;
the power supply unit provides 5V direct current to the U2MIC29302(PIN2), is converted into voltage required by the U3 telecommunication module N10 through the U2, and is provided to the U3 and peripheral circuits through the U2PIN 4. The switching of the power supply is controlled by the control unit via the U2PIN 1. The control unit controls the PIN6 of the U3 through the ON/OFF-GPRS to perform the power ON/OFF operation of the module.
Since the output voltage of the control unit is 3.3V and the voltage of the remote communication module is 2.8V, level conversion is required, and ON/OFF-GPRS performs level conversion through a triode Q6; the module data receiving port RXD carries out level conversion through a triode Q3; the module data transmitting port TXD is level-shifted by a transistor Q2.
Preferably, the memory cell comprises a W25Q128FVSS chip, a resistor R42 and a capacitor C36, wherein:
the/CS end of the W25Q128FVSS chip is electrically connected with the SPI1_ NSS end of the control unit, the DO (IO1) end is respectively electrically connected with the SPI1_ MISO end of the control unit and one end of the resistor R42, the/WP (IO2) end is respectively electrically connected with the 3.3V power supply output by the power supply unit and the other end of the resistor R42, the GND end is grounded, the VCC end is respectively electrically connected with the 3.3V power supply output by the power supply unit, the HOLD (IO3) end of the W25Q128FVSS chip and one end of the capacitor C36, the other end of the capacitor C36 is grounded, the CLK end is electrically connected with the SPI1_ SCK end of the control unit, and the DI (IO0) end is electrically connected with the SPI1_ MOSI end of the control unit;
the storage unit is used for storing operation parameters, statistical data and the like. The control unit is communicated with through SPI interfaces (SPI1_ MOSI, SPI1_ MISO, SPI1_ SCK, SPI1_ NSS).
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the current sampling unit is used for sampling the grounding current and transmitting the sampled data to the control unit, the control unit processes the data to obtain the actual grounding current, the data is interacted with the background through the remote communication unit, the real-time system state and data are displayed on the display unit, and meanwhile the storage unit stores statistical data and operating parameters for subsequent risk assessment.
Drawings
FIG. 1 is a system framework diagram of the present invention.
Fig. 2 is a circuit diagram of a power supply unit.
Fig. 3 is a circuit diagram of the control unit and the display unit.
Fig. 4 is a circuit diagram of a current sampling unit.
Fig. 5 is a circuit diagram of a remote communication unit.
Fig. 6 is a circuit diagram of a memory cell.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The utility model provides a ground current on-line monitoring terminal, includes current sampling unit, the control unit, memory cell, power supply unit, remote communication unit, display element, wherein:
the power supply unit supplies power to each unit;
the current sampling unit samples grounding current and is electrically connected with the control unit;
the storage unit stores statistical data and terminal operation parameters and is in bidirectional electrical connection with the control unit;
the remote communication unit is in bidirectional electric connection with the control unit, so that the terminal and the background can interact data;
and the display unit is electrically connected with the control unit and displays the real-time terminal state and data.
The power supply unit converts 220V alternating current into 5V and 3.3V direct current, and comprises a thermistor RZ2, a voltage dependent resistor RV1, a capacitor C9, an AC-DC module HQ05P10LRN, a magnetic bead L3, a magnetic bead L4, a bidirectional TVS tube TVS3, a unidirectional TVS tube TVS4, a low-voltage-difference voltage stabilizer LR-33 AA3-AR, an electrolytic capacitor C1118 10, a capacitor C12, a capacitor C62, an electrolytic capacitor C64 and an electrolytic capacitor C65, wherein:
the live wire is electrically connected with one end of a thermistor RZ2, the other end of the thermistor RZ2 is electrically connected with one end of a piezoresistor RV1, one end of a capacitor C9 and the AC (L) end of an AC-DC module HQ05P10LRN respectively, and the other end of the piezoresistor RV1, the other end of the capacitor C9 and the AC (N) end of the AC-DC module HQ05P10LRN are electrically connected with a zero line;
the GND end of the AC-DC module HQ05P10LRN is electrically connected with one end of a magnetic bead L3, the Vo + end of the AC-DC module HQ05P10LRN is electrically connected with one end of a magnetic bead L4, the other end of the magnetic bead L3 is electrically connected with one end of a TVS3 of a bidirectional TVS tube, the negative electrode of an electrolytic capacitor and one end of a capacitor C12 respectively, and the other end of the magnetic bead L4 is electrically connected with the other end of a TVS3 of the bidirectional TVS tube, the positive electrode of the electrolytic capacitor and the other end of the capacitor C12 respectively and outputs 5V direct current;
the end of Vin of a 5V direct current input low dropout regulator LR1118-33AA3-AR is connected with one end of a capacitor C62, the end of Vout of the low dropout regulator LR1118-33AA3-AR is respectively electrically connected with the anode of an electrolytic capacitor C64, one end of a capacitor C65 and one end of a unidirectional TVS4 and outputs 3.3V direct current, and the other end of the capacitor C62, the GND end of the low dropout regulator LR1118-33AA3-AR, the cathode of the electrolytic capacitor C64, the other end of the capacitor C65 and the other end of the unidirectional TVS4 are all grounded.
The control unit comprises a Cortex-M4 microcontroller STM32F405RGT6, a crystal oscillator Y3, a resistor R21, a capacitor C37, a resistor R22, a capacitor C42, a capacitor C43, a capacitor C44, a capacitor C45, a capacitor C46, a capacitor C48, a capacitor C1, a capacitor C53, a capacitor C41, a capacitor C98 and a capacitor C99, wherein:
a VDD19 end, a VDD32 end, a VDD48 end, a VDD64 end, a VBA1 end, and a VDDA/REF + end of the STM32F405RGT6 are all electrically connected to 3.3V direct current provided by the power supply unit, an OSC _ IN end is respectively electrically connected to one end of a crystal oscillator Y3 and one end of a capacitor C98, an OSC _ OUT end is respectively electrically connected to the other end of the crystal oscillator Y3 and one end of a capacitor C99, the other end of the capacitor C98 and the other end of the capacitor C99 are both grounded, a VCAP2 end is electrically connected to one end of a capacitor C41, a VCAP1 end is electrically connected to one end of a capacitor C53, a PB1 end is electrically connected to one end of a capacitor C1, and the other end of the capacitor C41, the other end of the capacitor C53 and the other;
the 3.3V direct current provided by the power supply unit is also electrically connected with one end of a capacitor C42, one end of a capacitor C43, one end of a capacitor C44, one end of a capacitor C45, one end of a capacitor C46 and one end of a capacitor C48 respectively, and the other end of a capacitor C42, the other end of a capacitor C43, the other end of a capacitor C44, the other end of a capacitor C45, the other end of a capacitor C46 and the other end of a capacitor C48 are all grounded;
the BOOT0 end of the STM32F405RGT6 is electrically connected with one end of a resistor R22, and the other end of the resistor R22 is grounded;
the NRST end of the STM32F405RGT6 is electrically connected with one end of a resistor R21 and one end of a capacitor C37 respectively, the other end of the resistor R21 is electrically connected with 3.3V direct current, and the other end of the capacitor C37 is grounded.
The display unit comprises a status indicator light LED1, a status indicator light LED2, a status indicator light LED3, a resistor R114, a resistor R115 and a resistor R116, wherein:
the cathode of the status indicator light LED1 is electrically connected with the PB5 end of the STM32F405RGT6, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R114;
the cathode of the status indicator light LED2 is electrically connected with the PB4 end of the STM32F405RGT6, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R115;
the cathode of the status indicator light LED1 is electrically connected with the PB3 end of the STM32F405RGT6, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R116;
the other end of the resistor R114, the other end of the resistor R115 and the other end of the resistor R116 are all electrically connected with 3.3V direct current.
The current sampling unit comprises an alternating current sampling chip RN8302B, a current transformer CT1, a 3.3V power supply, a resistor R10, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R24, a resistor R26, a resistor R96, a resistor R97, a resistor R106, a resistor R107, a crystal oscillator Y1, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C25, a capacitor C29, a capacitor C30, a capacitor C33, a capacitor C55, a capacitor C56, a capacitor C91 and a capacitor C92, wherein:
the current transformer CT1 is CT 107M;
the current transformer comprises a grounding current IA + connected with a 2 end of a current transformer CT1, a grounding current IA-connected with a1 end of a current transformer CT1, a3 end of the current transformer CT1 is respectively and electrically connected with one end of a resistor R107 and one end of a resistor R97, a 4 end of the current transformer CT1 is respectively and electrically connected with one end of a resistor R106 and one end of a resistor R96, the other end of a resistor R97 is respectively and electrically connected with one end of a capacitor C92 and an IAN end of an alternating current sampling chip RN8302B, the other end of a resistor R96 is respectively and electrically connected with one end of a capacitor C91 and an IAP end of an alternating current sampling chip RN8302B, and the other ends of the resistor R106, the resistor R107, the capacitor C92 and the capacitor C91 are all grounded;
the RC end, the PM end, the AGND end, the DGND39 end, the DGND29 end and the RA end of the AC sampling chip RN8302B are all grounded, the RB end, the DVCC40 end and the DVCC28 end are all connected with a 3.3V power supply, the SDI end is electrically connected with one end of a resistor R14, the other end of the resistor R14 is electrically connected with a control unit as an SPI interface SPI2_ MOSI, the SCSN end is electrically connected with the control unit as an SPI interface SPI2_ NSS and is also electrically connected with one end of a resistor R8, the other end of a resistor R18 is electrically connected with the 3.3V power supply, the SCLK end is electrically connected with one end of a resistor R16, the other end of a resistor R16 is electrically connected with the control unit as an SPI interface SPI2_ SCK, the SDO end is electrically connected with one end of a resistor 37R 84, the other end of a resistor R15 is electrically connected with the control unit as an SPI interface 2_ O, the RSTN is electrically connected with one end of a resistor 24, the other end of a resistor 46R 48 is electrically connected with one end of a MISFV 3.3V power supply, one end of a capacitor C30 is electrically connected, an XI end is electrically connected with one end of a resistor R26, one end of a capacitor C56 and one end of a crystal oscillator Y1 respectively, an XO end is electrically connected with the other end of a resistor R26, one end of a capacitor C55 and the other end of a crystal oscillator Y1 respectively, and an AVCC end is electrically connected with one end of a capacitor C33, one end of a capacitor C17 and one end of a resistor R17 respectively;
the other end of the resistor R17 is electrically connected with a 3.3V power supply, one end of a capacitor C14 and one end of a capacitor C25 respectively, and the other end of the capacitor C14, the other end of the capacitor C25, the other end of the capacitor C33, the other end of the capacitor C17, the other end of the capacitor C15, the other end of the capacitor C29, the other end of the capacitor C16, the other end of the capacitor C30, the other end of the capacitor C55 and the other end of the capacitor C17 are all grounded.
The remote communication unit comprises a remote communication chip N10, a voltage regulator MIC29302, a resistor R1, a resistor R5, an electrolytic capacitor DC4, a capacitor C4, an electrolytic capacitor DC5, a capacitor C5, a capacitor C9, a capacitor C12, a SIMCARD chip, a capacitor C10, a capacitor C15, a resistor R34, a capacitor C14, a resistor R11, a triode Q2, a resistor R12, a capacitor C2, a triode Q3, a resistor R3, a capacitor C3, a resistor R4, a capacitor C17, a resistor R13, a resistor R14, a triode Q6 and a capacitor C8, wherein:
the power supply unit provides 5V direct current to an Input end of a voltage regulator MIC 29302;
an Enable end of the voltage regulator MIC29302 is electrically connected with the control unit, an Input end is electrically connected with an anode of an electrolytic capacitor DC4 and one end of a capacitor C4 respectively, an Output end is electrically connected with an anode of an electrolytic capacitor DC5, one end of a capacitor C5, one end of a resistor R5, a VBAT2 end of a telecommunication chip N10, a VBAT3 end of a telecommunication chip N10 and a VBAT4 end of a telecommunication chip N10 respectively, an Adjust end is electrically connected with one end of a resistor R1 and the other end of a resistor R5 respectively, and a cathode of an electrolytic capacitor DC4, the other end of a capacitor C4, a cathode of an electrolytic capacitor DC5, the other end of a capacitor C5 and the other end of a resistor R1 are electrically connected;
the VCC end of the SIMCARD chip is electrically connected with one end of a capacitor C15 and one end of a capacitor C10 respectively, the RST end is electrically connected with one end of a capacitor C9 and the SIM _ RST end of a telecommunication chip N10 respectively, the CLK end is electrically connected with one end of a capacitor C12 and the SIM _ CLK end of a telecommunication chip N10 respectively, the GND end is electrically connected with the other end of a capacitor C10 and the other end of a capacitor C15 respectively, the IO end is electrically connected with one end of a capacitor C14, one end of a resistor R34 and the SIM _ IO end of a telecommunication chip N10 respectively, the other end of a resistor R34 is electrically connected with the SIM _ VDD end of the telecommunication chip N10, and the other end of a capacitor C9, the other end of a capacitor C12 and the other end of a capacitor C14 are;
the Output end of the voltage regulator MIC29302 is also electrically connected with one end of a resistor R11, the other end of a resistor R11 is electrically connected with an RXD-GPRS end of the control unit and a collector of a triode Q2, an emitter of the triode Q2 is electrically connected with a UTXD end of the control unit, a base of the triode Q2 is respectively and electrically connected with one end of a resistor R12 and one end of a capacitor C2, and the other end of the resistor R12 and the other end of the capacitor C2 are electrically connected with a VIO28 end of a remote communication chip N10;
the VIO28 end of the remote communication chip N10 is also electrically connected with one end of a resistor R3, one end of a capacitor C3 and one end of a resistor R4, the other end of a resistor R3 and the other end of a capacitor C3 are both electrically connected with the base electrode of a triode Q3, the emitter electrode of the triode Q3 is electrically connected with the TXD-GPRS end of the control unit, and the collector electrode of the triode Q3 is respectively electrically connected with the URXD end of the control unit and the other end of the resistor R4;
the Output end of the voltage regulator MIC29302 is also electrically connected with one end of a capacitor C17, and the other end of the capacitor C17 is grounded;
the ON/OFF-GPRS end of the control unit is electrically connected with one end of a resistor R13, the other end of the resistor R13 is electrically connected with one end of a resistor R14 and the base electrode of a triode Q6 respectively, the collector electrode of the triode Q6 is electrically connected with the ON/OFF end of a remote communication chip N10 and one end of a capacitor C8 respectively, and the other end of the resistor R14, the emitter electrode of the triode Q6 and the other end of the capacitor C8 are electrically connected.
The memory cell comprises a W25Q128FVSS chip, a resistor R42 and a capacitor C36, wherein:
the/CS end of the W25Q128FVSS chip is electrically connected with the SPI1_ NSS end of the control unit, the DO (IO1) end is respectively electrically connected with the SPI1_ MISO end of the control unit and one end of the resistor R42, the/WP (IO2) end is respectively electrically connected with the 3.3V power supply output by the power supply unit and the other end of the resistor R42, the GND end is grounded, the VCC end is respectively electrically connected with the 3.3V power supply output by the power supply unit, the HOLD (IO3) end of the W25Q128FVSS chip and one end of the capacitor C36, the other end of the capacitor C36 is grounded, the CLK end is electrically connected with the SPI1_ SCK end of the control unit, and the DI (IO0) end is electrically connected with the SPI1_ MOSI end of the control unit.
In the specific implementation process, the grounding electrode current of the neutral point of the distribution transformer is monitored through the grounding current online monitoring terminal, and real-time risk assessment, daily risk assessment and monthly annual risk statistics are carried out on the leakage risk.
And (3) real-time alarm of the leakage risk event:
acquiring real-time grounding current I and duration T meeting a certain current condition from a grounding current online monitoring terminal, and setting parameters: high risk of generating current IHIn case of risk occurrence of current IMHigh risk occurrence judgment time THAnd the occurrence judgment time T of the riskMHigh risk extinction Current I'H(IM<I’H≤IH) And a risk extinction current I'M(I’M≤IM) And high risk disappearance judgment time T'HAnd medium risk disappearance judgment time T'M(ii) a The terminal samples the grounding current I once per second and compares the grounding current I with related current parameters and time parameters according to the current risk level of the terminal. And when the current and the corresponding duration time both meet the requirement of another risk level, the terminal judges that the risk level is changed and triggers an alarm event.
When I is more than or equal to IHAnd T is not less than THIf so, judging that a high risk event occurs;
if I is less than or equal to I'MAnd T is more than or equal to T'MHigh risk degradation is low risk if I ≦ I'HAnd T is more than or equal to T'HThen the degradation is medium risk;
degradation by high risk, or I ≧ IMAnd T is more than or equal to TMIs an occurrence of a risk event;
if I is less than or equal to I'MAnd T is more than or equal to T'MThen the medium risk event is degraded to a low risk;
unsatisfied high risk, medium risk are defined as low risk, without triggering an alarm event.
When the risk level changes, the terminal triggers an alarm and reports to the background in real time.
The power distribution station area daily electric leakage risk assessment method comprises the following steps:
acquiring real-time grounding current I and minute average current I from grounding current online monitoring terminalavgSetting parameter high risk judgment time THAAnd an intermediate risk judgment time TMAThe terminal samples the grounding current I once per second and calculates the average current I once per minute within the minuteavg，IavgAnd IH、IMComparison, is greater than or equal to IHThe high risk cumulative time TH＝TH+1, less than IMThe low risk cumulative time TL＝TL+1, in other cases the risk accumulation time TM＝TMAnd +1, counting the risk accumulation time of various types all day. And the terminal reports the statistical data to the background. Background binding THA、TMA、IH、ILEvaluation was performed.
THGreater than or equal to THA: judging the power distribution area to be a high-risk power distribution area after 60 minutes;
does not meet the high risk criterion, and TH+TMGreater than or equal to TMA: judging the power distribution area to be in danger within 120 minutes;
and judging the other situations as low-risk power distribution station areas.
And 4, monthly and annual leakage risk statistics of the power distribution station area:
the method is completed in a server side background, the monthly, annual high, medium and low risk days of a specific power distribution area are counted, and the high risk rate, medium risk rate and low risk rate of electric leakage of the unit area are counted.
The above parameter reference values are: i isH＝3A、IM＝1A、TH＝5min、TM＝5min、I’H＝2.7A、I’M＝0.9A、T’H＝2min、T’M＝2min、THA＝60min、TMAThe parameters can be adjusted as required for 120 min.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. The utility model provides a ground current on-line monitoring terminal which characterized in that, includes current sampling unit, the control unit, memory cell, power supply unit, remote communication unit, display element, wherein:
the power supply unit supplies power to each unit;
the current sampling unit samples grounding current and is electrically connected with the control unit;
the storage unit stores statistical data and grounding current on-line monitoring terminal operation parameters and is in bidirectional electric connection with the control unit;
the remote communication unit is in bidirectional electric connection with the control unit, so that the grounding current online monitoring terminal and the background interact data;
and the display unit is electrically connected with the control unit and is used for displaying the state and data of the real-time grounding current on-line monitoring terminal.
2. The ground current on-line monitoring terminal of claim 1, wherein the power supply unit converts 220V AC power into 5V DC power and 3.3V DC power, and comprises a thermistor RZ2, a voltage dependent resistor RV1, a capacitor C9, an AC-DC module, a magnetic bead L3, a magnetic bead L4, a bidirectional TVS tube TVS3, a unidirectional TVS tube TVS4, a low dropout regulator, an electrolytic capacitor C10, a capacitor C12, a capacitor C62, an electrolytic capacitor C64, and an electrolytic capacitor C65, wherein:
the live wire is electrically connected with one end of a thermistor RZ2, the other end of the thermistor RZ2 is respectively electrically connected with one end of a piezoresistor RV1, one end of a capacitor C9 and the AC (L) end of an AC-DC module, and the other end of the piezoresistor RV1, the other end of the capacitor C9 and the AC (N) end of the AC-DC module are electrically connected with a zero line;
the GND end of the AC-DC module is electrically connected with one end of a magnetic bead L3, the Vo + end of the AC-DC module is electrically connected with one end of a magnetic bead L4, the other end of the magnetic bead L3 is electrically connected with one end of a TVS3, the negative electrode of an electrolytic capacitor and one end of a capacitor C12 respectively, and the other end of the magnetic bead L4 is electrically connected with the other end of a TVS3, the positive electrode of the electrolytic capacitor and the other end of the capacitor C12 respectively and outputs 5V direct current;
the 5V direct current is input into a Vin end of the low-dropout regulator and one end of a capacitor C62, a Vout end of the low-dropout regulator is respectively electrically connected with an anode of an electrolytic capacitor C64, one end of a capacitor C65 and one end of a one-way TVS4 and outputs 3.3V direct current, and the other end of the capacitor C62, a GND end of the low-dropout regulator, a cathode of an electrolytic capacitor C64, the other end of a capacitor C65 and the other end of the one-way TVS4 are all grounded.
3. The ground current online monitoring terminal of claim 2, wherein the control unit comprises a Cortex-M4 microcontroller, a crystal oscillator Y3, a resistor R21, a capacitor C37, a resistor R22, a capacitor C42, a capacitor C43, a capacitor C44, a capacitor C45, a capacitor C46, a capacitor C48, a capacitor C1, a capacitor C53, a capacitor C41, a capacitor C98 and a capacitor C99, wherein:
a VDD19 end, a VDD32 end, a VDD48 end, a VDD64 end, a VBA1 end and a VDDA/REF + end of the Cortex-M4 microcontroller are all electrically connected with 3.3V direct current provided by a power supply unit, an OSC _ IN end is respectively electrically connected with one end of a crystal oscillator Y3 and one end of a capacitor C98, an OSC _ OUT end is respectively electrically connected with the other end of the crystal oscillator Y3 and one end of a capacitor C99, the other end of the capacitor C98 and the other end of the capacitor C99 are both grounded, a VCAP2 end is electrically connected with one end of a capacitor C41, a VCAP1 end is electrically connected with one end of a capacitor C53, a PB1 end is electrically connected with one end of a capacitor C1, and the other end of the capacitor C41, the other end of the capacitor C53 and the other end of;
the 3.3V direct current provided by the power supply unit is also electrically connected with one end of a capacitor C42, one end of a capacitor C43, one end of a capacitor C44, one end of a capacitor C45, one end of a capacitor C46 and one end of a capacitor C48 respectively, and the other end of a capacitor C42, the other end of a capacitor C43, the other end of a capacitor C44, the other end of a capacitor C45, the other end of a capacitor C46 and the other end of a capacitor C48 are all grounded;
the BOOT0 end of the Cortex-M4 microcontroller is electrically connected with one end of a resistor R22, and the other end of the resistor R22 is grounded;
the NRST end of the Cortex-M4 microcontroller is electrically connected with one end of a resistor R21 and one end of a capacitor C37 respectively, the other end of the resistor R21 is electrically connected with 3.3V direct current, and the other end of the capacitor C37 is grounded.
4. The ground current on-line monitoring terminal of claim 3, characterized in that the display unit comprises a status indicator light LED1, a status indicator light LED2, a status indicator light LED3, a resistor R114, a resistor R115 and a resistor R116, wherein:
the cathode of the status indicator light LED1 is electrically connected with the PB5 end of the Cortex-M4 microcontroller, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R114;
the cathode of the status indicator light LED2 is electrically connected with the PB4 end of the Cortex-M4 microcontroller, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R115;
the cathode of the status indicator light LED1 is electrically connected with the PB3 end of the Cortex-M4 microcontroller, and the anode of the status indicator light LED1 is electrically connected with one end of the resistor R116;
the other end of the resistor R114, the other end of the resistor R115 and the other end of the resistor R116 are all electrically connected with 3.3V direct current.
5. The ground current online monitoring terminal of claim 4, wherein the current sampling unit comprises an alternating current sampling chip, a current transformer CT1, a 3.3V power supply, a resistor R10, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R24, a resistor R26, a resistor R96, a resistor R97, a resistor R106, a resistor R107, a crystal oscillator Y1, a capacitor C14, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C25, a capacitor C29, a capacitor C30, a capacitor C33, a capacitor C55, a capacitor C56, a capacitor C91 and a capacitor C92, wherein:
the grounding current IA + is connected with the 2 end of a current transformer CT1, the grounding current IA-is connected with the 1 end of a current transformer CT1, the 3 end of the current transformer CT1 is respectively and electrically connected with one end of a resistor R107 and one end of a resistor R97, the 4 end of the current transformer CT1 is respectively and electrically connected with one end of a resistor R106 and one end of a resistor R96, the other end of a resistor R97 is respectively and electrically connected with one end of a capacitor C92 and the IAN end of an alternating current sampling chip, the other end of a resistor R96 is respectively and electrically connected with one end of a capacitor C91 and the IAP end of the alternating current sampling chip, and the other end of the resistor R106, the other end of the resistor R107, the other end of the capacitor C92 and the other;
the RC end, the PM end, the AGND end, the DGND39 end, the DGND29 end and the RA end of the AC sampling chip are all grounded, the RB end, the DVCC40 end and the DVCC28 end are all connected with a 3.3V power supply, the SDI end is electrically connected with one end of a resistor R14, the other end of the resistor R14 is electrically connected with a control unit as an SPI2_ MOSI interface, the SCSN end is electrically connected with the control unit as an SPI interface SPI2_ NSS and is also electrically connected with one end of a resistor R18, the other end of the resistor R18 is electrically connected with the 3.3V power supply, the SCLK end is electrically connected with one end of a resistor R16, the other end of the resistor R16 is electrically connected with the control unit as an SPI interface 2_ SCK, the SDO end is electrically connected with one end of a resistor R15, the other end of the resistor R15 is electrically connected with the control unit as an SPI interface 2_ O, the RSTN is electrically connected with one end of a resistor R24, the other end of the PM end of the 3.3V power supply, the FV end is electrically connected with one end of, One end of a capacitor C30 is electrically connected, an XI end is electrically connected with one end of a resistor R26, one end of a capacitor C56 and one end of a crystal oscillator Y1 respectively, an XO end is electrically connected with the other end of a resistor R26, one end of a capacitor C55 and the other end of a crystal oscillator Y1 respectively, and an AVCC end is electrically connected with one end of a capacitor C33, one end of a capacitor C17 and one end of a resistor R17 respectively;
the other end of the resistor R17 is electrically connected with a 3.3V power supply, one end of a capacitor C14 and one end of a capacitor C25 respectively, and the other end of the capacitor C14, the other end of the capacitor C25, the other end of the capacitor C33, the other end of the capacitor C17, the other end of the capacitor C15, the other end of the capacitor C29, the other end of the capacitor C16, the other end of the capacitor C30, the other end of the capacitor C55 and the other end of the capacitor C17 are all grounded.
6. The ground current on-line monitoring terminal of claim 5, wherein the remote communication unit comprises a remote communication chip N10, a voltage regulator, a resistor R1, a resistor R5, an electrolytic capacitor DC4, a capacitor C4, an electrolytic capacitor DC5, a capacitor C5, a capacitor C9, a capacitor C12, a SIMCARD chip, a capacitor C10, a capacitor C15, a resistor R34, a capacitor C14, a resistor R11, a transistor Q2, a resistor R12, a capacitor C2, a transistor Q3, a resistor R3, a capacitor C3, a resistor R4, a capacitor C17, a resistor R13, a resistor R14, a transistor Q6, and a capacitor C8, wherein:
the power supply unit provides 5V direct current to an Input end of the voltage regulator;
an Enable end of the voltage regulator is electrically connected with the control unit, an Input end is electrically connected with an anode of an electrolytic capacitor DC4 and one end of a capacitor C4 respectively, an Output end is electrically connected with an anode of an electrolytic capacitor DC5, one end of a capacitor C5, one end of a resistor R5, a VBAT2 end of a telecommunication chip N10, a VBAT3 end of a telecommunication chip N10 and a VBAT4 end of a telecommunication chip N10 respectively, an Adjust end is electrically connected with one end of a resistor R1 and the other end of the resistor R5 respectively, and a cathode of an electrolytic capacitor DC4, the other end of a capacitor C4, a cathode of an electrolytic capacitor DC5, the other end of a capacitor C5 and the other end of a resistor R1 are electrically connected;
the VCC end of the SIMCARD chip is electrically connected with one end of a capacitor C15 and one end of a capacitor C10 respectively, the RST end is electrically connected with one end of a capacitor C9 and the SIM _ RST end of a telecommunication chip N10 respectively, the CLK end is electrically connected with one end of a capacitor C12 and the SIM _ CLK end of a telecommunication chip N10 respectively, the GND end is electrically connected with the other end of a capacitor C10 and the other end of a capacitor C15 respectively, the IO end is electrically connected with one end of a capacitor C14, one end of a resistor R34 and the SIM _ IO end of a telecommunication chip N10 respectively, the other end of a resistor R34 is electrically connected with the SIM _ VDD end of the telecommunication chip N10, and the other end of a capacitor C9, the other end of a capacitor C12 and the other end of a capacitor C14 are;
the Output end of the voltage regulator is also electrically connected with one end of a resistor R11, the other end of the resistor R11 is electrically connected with an RXD-GPRS end of the control unit and a collector of a triode Q2, an emitter of the triode Q2 is electrically connected with an UTXD end of the control unit, a base of the triode Q2 is respectively electrically connected with one end of a resistor R12 and one end of a capacitor C2, and the other end of the resistor R12 and the other end of the capacitor C2 are electrically connected with a VIO28 end of the remote communication chip N10;
the VIO28 end of the remote communication chip N10 is also electrically connected with one end of a resistor R3, one end of a capacitor C3 and one end of a resistor R4, the other end of a resistor R3 and the other end of a capacitor C3 are both electrically connected with the base electrode of a triode Q3, the emitter electrode of the triode Q3 is electrically connected with the TXD-GPRS end of the control unit, and the collector electrode of the triode Q3 is respectively electrically connected with the URXD end of the control unit and the other end of the resistor R4;
the Output end of the voltage regulator is also electrically connected with one end of a capacitor C17, and the other end of the capacitor C17 is grounded;
the ON/OFF-GPRS end of the control unit is electrically connected with one end of a resistor R13, the other end of the resistor R13 is electrically connected with one end of a resistor R14 and the base electrode of a triode Q6 respectively, the collector electrode of the triode Q6 is electrically connected with the ON/OFF end of a remote communication chip N10 and one end of a capacitor C8 respectively, and the other end of the resistor R14, the emitter electrode of the triode Q6 and the other end of the capacitor C8 are electrically connected.
7. The ground current online monitoring terminal of claim 6, wherein the memory cell comprises a W25Q128FVSS chip, a resistor R42 and a capacitor C36, wherein:
the/CS end of the W25Q128FVSS chip is electrically connected with the SPI1_ NSS end of the control unit, the DO (IO1) end is respectively electrically connected with the SPI1_ MISO end of the control unit and one end of the resistor R42, the/WP (IO2) end is respectively electrically connected with the 3.3V power supply output by the power supply unit and the other end of the resistor R42, the GND end is grounded, the VCC end is respectively electrically connected with the 3.3V power supply output by the power supply unit, the HOLD (IO3) end of the W25Q128FVSS chip and one end of the capacitor C36, the other end of the capacitor C36 is grounded, the CLK end is electrically connected with the SPI1_ SCK end of the control unit, and the DI (IO0) end is electrically connected with the SPI1_ MOSI end of the control unit.
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| CN109917234A (en) * | 2019-04-16 | 2019-06-21 | 胡群勇 | A kind of low-voltage network fault monitoring device and method |
| CN210898635U (en) * | 2019-09-11 | 2020-06-30 | 广东电网有限责任公司 | Grounding current on-line monitoring terminal |
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