Fusion terminal device for monitoring and diagnosing multi-channel comprehensive state of transformer area line

Abstract

The utility model relates to the technical field of distribution transformer monitoring, in particular to a fusion terminal device for multi-channel comprehensive state monitoring and diagnosis of court lines, which comprises a voltage and current acquisition circuit, a frequency and phase acquisition circuit, a temperature acquisition circuit, a control module and a GPRS (General Packet Radio Service) communication module, the voltage and current acquisition circuit is used for acquiring voltage and current data of each low-voltage branch line and transmitting effective information of the acquired current and voltage to the control module; the temperature acquisition circuit is used for acquiring the temperature of each low-voltage branch line and transmitting the acquired temperature information to the control module; the frequency and phase acquisition circuit performs frequency and phase information fitting acquisition and transmits the information to the control module; the control module carries out data integration and analysis, and the data is uploaded to a cloud platform through the GPRS communication module, so that various electric parameters of the low-voltage branch line of the power distribution room can be monitored in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution transformer monitoring, in particular to a fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines. Background Art

[0002] The low-voltage distribution network is at the end of the entire power grid. It has the characteristics of wide distribution, complex power supply and consumption environment, and difficult operation and maintenance. It has long lacked intelligent and efficient operation data monitoring and maintenance. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines, which can monitor various electrical parameters of low-voltage branch lines in a distribution room in real time.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines, including a voltage and current acquisition circuit, a frequency and phase acquisition circuit, a temperature acquisition circuit, a control module and a GPRS communication module. The input end of the voltage and current acquisition circuit, the input end of the frequency and phase acquisition circuit and the input end of the temperature acquisition circuit are all electrically connected to the low-voltage branch line of the distribution room, and the control module is respectively electrically connected to the output end of the voltage and current acquisition circuit, the output end of the frequency and phase acquisition circuit, the output end of the temperature acquisition circuit and the input end of the GPRS communication module.

[0006] Furthermore, the frequency phase acquisition circuit includes a rectifier bridge, a diode D6, a voltage divider unit, a transistor Q1 and a photoelectric coupler U1, one end of the light source of the photoelectric coupler U1 is electrically connected to the emitter of the transistor Q1, the other end of the light source of the photoelectric coupler U1 is electrically connected to the voltage divider unit, and the other end of the light source of the photoelectric coupler U1 and the voltage divider unit are both grounded, one end of the light receiver of the photoelectric coupler U1 is electrically connected to the control module, the other end of the light receiver of the photoelectric coupler U1 is grounded, the voltage divider unit is electrically connected to the rectifier bridge through the diode D6, the first end of the rectifier bridge is electrically connected to the A phase line, the second end of the rectifier bridge is electrically connected to the neutral line, the third end of the rectifier bridge is grounded, the fourth end of the rectifier bridge is electrically connected to the collector of the transistor Q1, and the base of the transistor Q1 is electrically connected to the voltage divider unit.

[0007] Furthermore, the voltage divider unit includes a resistor R24 ​​and a resistor R29, one end of the resistor R24 ​​is electrically connected to the cathode of the diode D6, the other end of the resistor R24 ​​is electrically connected to one end of the resistor R29 and the base of the transistor Q1, respectively, the other end of the resistor R29 is electrically connected to the other end of the light source of the photocoupler U1, and the other end of the resistor R29 is grounded.

[0008] Furthermore, the voltage divider unit also includes a Zener diode D8, the cathode of the Zener diode D8 is electrically connected to the other end of the resistor R24 ​​and one end of the resistor R29 respectively, the anode of the Zener diode D8 is electrically connected to the other end of the resistor R29 and the other end of the light source of the photocoupler U1 respectively, and the anode of the Zener diode D8 is grounded.

[0009] Furthermore, the voltage divider unit also includes a capacitor C11, one end of the capacitor C11 is electrically connected to the cathode of the voltage regulator tube D8, the other end of the resistor R24 ​​and one end of the resistor R29, respectively, and the other end of the capacitor C11 is electrically connected to the anode of the voltage regulator tube D8 and the other end of the light source of the photocoupler U1, and the other end of the capacitor C11 is grounded.

[0010] Furthermore, the frequency phase acquisition circuit also includes a resistor R27 and a diode D7, one end of the resistor R27 is electrically connected to the voltage divider unit, the other end of the resistor R27 is electrically connected to the anode of the diode D7, and the cathode of the diode D7 is electrically connected to the base of the transistor Q1.

[0011] Furthermore, the frequency phase acquisition circuit also includes a resistor R25 and a diode D5, one end of the resistor R25 is electrically connected to the collector of the transistor Q1, the other end of the resistor R25 is electrically connected to the cathode of the diode D5, and the anode of the diode D5 is electrically connected to the third and fourth ends of the rectifier bridge respectively.

[0012] Furthermore, the frequency phase acquisition circuit also includes a resistor R11 and a resistor R16, one end of the resistor R11 is electrically connected to the fourth end of the rectifier bridge, the other end of the resistor R11 is electrically connected to one end of the resistor R16 and the collector of the transistor Q1, respectively, the other end of the resistor R16 is electrically connected to the third end of the rectifier bridge and the other end of the resistor R16 is grounded.

[0013] Furthermore, the voltage and current acquisition circuit includes a signal conversion unit and multiple current and voltage acquisition units for acquiring the current and voltage on the low-voltage branch lines of the power distribution room. The number of the current and voltage acquisition units is the same as the number of phase lines in the frequency and phase acquisition circuit.

[0014] The current and voltage acquisition unit includes a current transformer CT1 and a voltage transformer PT1. The acquisition end of the current transformer CT1 and the acquisition end of the voltage transformer PT1 are both electrically connected to the low-voltage branch line of the distribution room. The output end of the current transformer CT1 and the output end of the voltage transformer PT1 are both electrically connected to the signal conversion unit, and the signal conversion unit is electrically connected to the control module.

[0015] Furthermore, the signal conversion unit includes a signal conversion chip U2, the model of the signal conversion chip U2 is ADE7758, the fifth pin and the sixth pin of the signal conversion chip U2 are both electrically connected to the output end of the current transformer CT1, the sixteenth pin of the signal conversion chip U2 is electrically connected to the output end of the voltage transformer PT1, and the eighteenth pin, the twenty-first pin, the twenty-second pin, the twenty-third pin and the twenty-fourth pin of the signal conversion chip U2 are all electrically connected to the control module.

[0016] The beneficial effects of the present invention are:

[0017] This solution sets up a voltage and current acquisition circuit, a frequency and phase acquisition circuit, a temperature acquisition circuit, a control module and a GPRS communication module. The voltage and current acquisition circuit respectively acquires the voltage and current data of each low-voltage branch line, and transmits the acquired effective information of current and voltage to the control module; the temperature acquisition circuit acquires the temperature of each low-voltage branch line, and transmits the acquired temperature information to the control module; the frequency and phase acquisition circuit performs frequency and phase information fitting acquisition and transmits it to the control module; the control module performs data integration and analysis, and uploads the data to the cloud platform through the GPRS communication module, so that various electrical parameters of the low-voltage branch lines in the distribution room can be monitored in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a connection block diagram of the fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of the substation line of the utility model;

[0019] Figure 2 This is a circuit schematic diagram of the frequency and phase acquisition circuit of the fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of the substation line of the utility model;

[0020] Figure 3 This is a circuit schematic diagram of the voltage and current acquisition unit of the fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of the substation line of the utility model;

[0021] Figure 4 This is a circuit schematic diagram of the signal conversion unit of the fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of the substation line of the utility model;

[0022] Figure 5This is a circuit schematic diagram of the temperature acquisition circuit, control module and GPRS communication module of the integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of the substation line of the utility model;

[0023] Description of labels:

[0024] 1. Voltage and current acquisition circuit; 2. Frequency and phase acquisition circuit; 3. Temperature acquisition circuit; 4. Control module; 5. GPRS communication module; 6. Low-voltage branch line. DETAILED DESCRIPTION

[0025] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0026] Please refer to Figure 1 , the technical solution adopted by this utility model is:

[0027] A fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines, including a voltage and current acquisition circuit, a frequency and phase acquisition circuit, a temperature acquisition circuit, a control module and a GPRS communication module. The input end of the voltage and current acquisition circuit, the input end of the frequency and phase acquisition circuit and the input end of the temperature acquisition circuit are all electrically connected to the low-voltage branch line of the distribution room, and the control module is respectively electrically connected to the output end of the voltage and current acquisition circuit, the output end of the frequency and phase acquisition circuit, the output end of the temperature acquisition circuit and the input end of the GPRS communication module.

[0028] From the above description, it can be seen that the beneficial effects of the present invention are:

[0029] This solution sets up a voltage and current acquisition circuit, a frequency and phase acquisition circuit, a temperature acquisition circuit, a control module and a GPRS communication module. The voltage and current acquisition circuit respectively acquires the voltage and current data of each low-voltage branch line, and transmits the acquired effective information of current and voltage to the control module; the temperature acquisition circuit acquires the temperature of each low-voltage branch line, and transmits the acquired temperature information to the control module; the frequency and phase acquisition circuit performs frequency and phase information fitting acquisition and transmits it to the control module; the control module performs data integration and analysis, and uploads the data to the cloud platform through the GPRS communication module, so that various electrical parameters of the low-voltage branch lines in the distribution room can be monitored in real time.

[0030] Furthermore, the frequency phase acquisition circuit includes a rectifier bridge, a diode D6, a voltage divider unit, a transistor Q1 and a photoelectric coupler U1, one end of the light source of the photoelectric coupler U1 is electrically connected to the emitter of the transistor Q1, the other end of the light source of the photoelectric coupler U1 is electrically connected to the voltage divider unit, and the other end of the light source of the photoelectric coupler U1 and the voltage divider unit are both grounded, one end of the light receiver of the photoelectric coupler U1 is electrically connected to the control module, the other end of the light receiver of the photoelectric coupler U1 is grounded, the voltage divider unit is electrically connected to the rectifier bridge through the diode D6, the first end of the rectifier bridge is electrically connected to the A phase line, the second end of the rectifier bridge is electrically connected to the neutral line, the third end of the rectifier bridge is grounded, the fourth end of the rectifier bridge is electrically connected to the collector of the transistor Q1, and the base of the transistor Q1 is electrically connected to the voltage divider unit.

[0031] From the above description, it can be seen that the diode D6 performs half-wave rectification and outputs a periodically changing waveform. After voltage division by the voltage divider unit, it drives the transistor Q1 to turn on, so that the photocoupler U1 is turned on. After isolation by the photocoupler U1, the photoreceiver of the photocoupler U1 outputs a periodic square wave. By comparing the rising edge of the same line, the effective frequency of the line can be obtained. By comparing the time difference of the rising edges of different lines, the phase difference of different lines can be obtained.

[0032] Furthermore, the voltage divider unit includes a resistor R24 ​​and a resistor R29, one end of the resistor R24 ​​is electrically connected to the cathode of the diode D6, the other end of the resistor R24 ​​is electrically connected to one end of the resistor R29 and the base of the transistor Q1, respectively, the other end of the resistor R29 is electrically connected to the other end of the light source of the photocoupler U1, and the other end of the resistor R29 is grounded.

[0033] Furthermore, the voltage divider unit also includes a Zener diode D8, the cathode of the Zener diode D8 is electrically connected to the other end of the resistor R24 ​​and one end of the resistor R29 respectively, the anode of the Zener diode D8 is electrically connected to the other end of the resistor R29 and the other end of the light source of the photocoupler U1 respectively, and the anode of the Zener diode D8 is grounded.

[0034] From the above description, it can be seen that the voltage regulator D8 can ensure that the driving voltage varies within a safe range, limit excessive voltage values, and thus protect the back-end devices.

[0035] Furthermore, the voltage divider unit also includes a capacitor C11, one end of the capacitor C11 is electrically connected to the cathode of the voltage regulator tube D8, the other end of the resistor R24 ​​and one end of the resistor R29, respectively, and the other end of the capacitor C11 is electrically connected to the anode of the voltage regulator tube D8 and the other end of the light source of the photocoupler U1, and the other end of the capacitor C11 is grounded.

[0036] From the above description, it can be seen that capacitor C11 can perform high-frequency filtering on the waveform of the half-wave rectification of diode D6, filter out interference signals, and make the frequency and phase acquisition of the back end more accurate.

[0037] Furthermore, the frequency phase acquisition circuit also includes a resistor R27 and a diode D7, one end of the resistor R27 is electrically connected to the voltage divider unit, the other end of the resistor R27 is electrically connected to the anode of the diode D7, and the cathode of the diode D7 is electrically connected to the base of the transistor Q1.

[0038] From the above description, it can be seen that the resistor R27 as a current limiting resistor and the unidirectional conduction performance of the diode D7 together construct a driving circuit to drive the transistor Q1 to turn on.

[0039] Furthermore, the frequency phase acquisition circuit also includes a resistor R25 and a diode D5, one end of the resistor R25 is electrically connected to the collector of the transistor Q1, the other end of the resistor R25 is electrically connected to the cathode of the diode D5, and the anode of the diode D5 is electrically connected to the third and fourth ends of the rectifier bridge respectively.

[0040] From the above description, it can be seen that the resistor R25 acts as a current limiting resistor for the optocoupler U1 and the unidirectional conduction performance of the diode D5 provides a suitable power supply current for the driving end of the optocoupler U1 to ensure stable operation of the isolation end.

[0041] Furthermore, the frequency phase acquisition circuit also includes a resistor R11 and a resistor R16, one end of the resistor R11 is electrically connected to the fourth end of the rectifier bridge, the other end of the resistor R11 is electrically connected to one end of the resistor R16 and the collector of the transistor Q1, respectively, the other end of the resistor R16 is electrically connected to the third end of the rectifier bridge and the other end of the resistor R16 is grounded.

[0042] From the above description, it can be seen that the resistor R11 and the resistor R16 form a simple voltage divider circuit, which provides a suitable power supply voltage for the driving end of the optocoupler U1 and ensures stable operation of the isolation end.

[0043] Furthermore, the voltage and current acquisition circuit includes a signal conversion unit and multiple current and voltage acquisition units for acquiring the current and voltage on the low-voltage branch lines of the power distribution room. The number of the current and voltage acquisition units is the same as the number of phase lines in the frequency and phase acquisition circuit.

[0044] The current and voltage acquisition unit includes a current transformer CT1 and a voltage transformer PT1. The acquisition end of the current transformer CT1 and the acquisition end of the voltage transformer PT1 are both electrically connected to the low-voltage branch line of the distribution room. The output end of the current transformer CT1 and the output end of the voltage transformer PT1 are both electrically connected to the signal conversion unit, and the signal conversion unit is electrically connected to the control module.

[0045] Furthermore, the signal conversion unit includes a signal conversion chip U2, the model of the signal conversion chip U2 is ADE7758, the fifth pin and the sixth pin of the signal conversion chip U2 are both electrically connected to the output end of the current transformer CT1, the sixteenth pin of the signal conversion chip U2 is electrically connected to the output end of the voltage transformer PT1, and the eighteenth pin, the twenty-first pin, the twenty-second pin, the twenty-third pin and the twenty-fourth pin of the signal conversion chip U2 are all electrically connected to the control module.

[0046] Please refer to Figures 1 to 5 As shown, the first embodiment of the present utility model is:

[0047] Please refer to Figure 1 A fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines includes a voltage and current acquisition circuit 1, a frequency and phase acquisition circuit 2, a temperature acquisition circuit 3, a control module 4 and a GPRS communication module 5. The input end of the voltage and current acquisition circuit 1, the input end of the frequency and phase acquisition circuit 2 and the input end of the temperature acquisition circuit 3 are all electrically connected to the low-voltage branch line 6 of the distribution room, and the control module 4 is respectively electrically connected to the output end of the voltage and current acquisition circuit 1, the output end of the frequency and phase acquisition circuit 2, the output end of the temperature acquisition circuit 3 and the input end of the GPRS communication module 5.

[0048] Please refer to Figure 2 The frequency phase acquisition circuit 2 includes a rectifier bridge, a diode D6, a voltage divider unit, a transistor Q1 and a photoelectric coupler U1. One end of the light source of the photoelectric coupler U1 is electrically connected to the emitter of the transistor Q1, the other end of the light source of the photoelectric coupler U1 is electrically connected to the voltage divider unit, and the other end of the light source of the photoelectric coupler U1 and the voltage divider unit are both grounded. One end of the light receiver of the photoelectric coupler U1 is electrically connected to the control module 4, and the other end of the light receiver of the photoelectric coupler U1 is grounded. The voltage divider unit is electrically connected to the rectifier bridge through the diode D6. The first end of the rectifier bridge is electrically connected to the A phase line, the second end of the rectifier bridge is electrically connected to the neutral line, the third end of the rectifier bridge is grounded, the fourth end of the rectifier bridge is electrically connected to the collector of the transistor Q1, and the base of the transistor Q1 is electrically connected to the voltage divider unit.

[0049] Please refer to Figure 2 The voltage divider unit includes a resistor R24 ​​and a resistor R29, one end of the resistor R24 ​​is electrically connected to the cathode of the diode D6, the other end of the resistor R24 ​​is electrically connected to one end of the resistor R29 and the base of the transistor Q1 respectively, the other end of the resistor R29 is electrically connected to the other end of the light source of the photocoupler U1 and the other end of the resistor R29 is grounded.

[0050] Please refer to Figure 2 The voltage divider unit also includes a voltage regulator tube D8, the cathode of the voltage regulator tube D8 is electrically connected to the other end of the resistor R24 ​​and one end of the resistor R29 respectively, the anode of the voltage regulator tube D8 is electrically connected to the other end of the resistor R29 and the other end of the light source of the photocoupler U1 respectively, and the anode of the voltage regulator tube D8 is grounded.

[0051] Please refer to Figure 2 The voltage divider unit also includes a capacitor C11, one end of the capacitor C11 is electrically connected to the cathode of the voltage regulator tube D8, the other end of the resistor R24 ​​and one end of the resistor R29, respectively, and the other end of the capacitor C11 is electrically connected to the anode of the voltage regulator tube D8 and the other end of the light source of the photocoupler U1, and the other end of the capacitor C11 is grounded.

[0052] Please refer to Figure 2 The frequency phase acquisition circuit 2 further includes a resistor R27 and a diode D7, one end of the resistor R27 is electrically connected to the voltage divider unit, the other end of the resistor R27 is electrically connected to the anode of the diode D7, and the cathode of the diode D7 is electrically connected to the base of the transistor Q1.

[0053] Please refer to Figure 2 The frequency phase acquisition circuit 2 further includes a resistor R25 and a diode D5, one end of the resistor R25 is electrically connected to the collector of the transistor Q1, the other end of the resistor R25 is electrically connected to the cathode of the diode D5, and the anode of the diode D5 is electrically connected to the third and fourth ends of the rectifier bridge respectively.

[0054] Please refer to Figure 2 The frequency phase acquisition circuit 2 also includes a resistor R11 and a resistor R16, one end of the resistor R11 is electrically connected to the fourth end of the rectifier bridge, the other end of the resistor R11 is electrically connected to one end of the resistor R16 and the collector of the transistor Q1, respectively, the other end of the resistor R16 is electrically connected to the third end of the rectifier bridge, and the other end of the resistor R16 is grounded.

[0055] The frequency phase acquisition circuit 2 also includes a capacitor C6 and a resistor R26. For the specific connection relationship between the capacitor C6 and the resistor R26 and other components, please refer to Figure 2 Capacitor C6 is mainly used as a filter capacitor to make the waveform of the full-wave rectification more stable, ensuring the stable performance of the isolation end driver part; resistor R26 is used for voltage clamping, so that the high and low levels of the back end of the optocoupler U1 can be output normally.

[0056] Please refer to Figure 3 and Figure 4The voltage and current acquisition circuit 1 includes a signal conversion unit and multiple current and voltage acquisition units for collecting the current and voltage on the low-voltage branch line 6 of the power distribution room. The number of the current and voltage acquisition units is the same as the number of phase lines in the frequency and phase acquisition circuit 2;

[0057] Please refer to Figure 3 The current and voltage acquisition unit includes a current transformer CT1 and a voltage transformer PT1. The acquisition end of the current transformer CT1 and the acquisition end of the voltage transformer PT1 are both electrically connected to the low-voltage branch line 6 of the distribution room. The output end of the current transformer CT1 and the output end of the voltage transformer PT1 are both electrically connected to the signal conversion unit, and the signal conversion unit is electrically connected to the control module 4.

[0058] Please refer to Figure 3 The current and voltage acquisition unit further includes a resistor R4, a capacitor C1, a capacitor C3, a resistor R1, a resistor R7, a resistor R3, a resistor R6, a resistor R5, a resistor R2, and a capacitor C2; the resistors R4, R12, and R21 respectively convert the induced currents of the three groups of coils into voltage signals, and one pin of the capacitor C1 and the capacitor C3 is grounded so that the center signal point of the waveform signal is the ground. The three groups of signal grounds constitute a neutral point, thereby ensuring that the phase of the acquired waveform is consistent with the phase of the actual waveform.

[0059] In this embodiment, the frequency phase acquisition circuit 2 has three phase lines, namely phase line A, phase line B and phase line C. Therefore, the number of current and voltage acquisition units in this embodiment is three. For the specific structure of the other two current and voltage acquisition units, please refer to Figure 3 , one current and voltage acquisition unit includes a current transformer CT2, a resistor R12, a capacitor C4, a capacitor C7, a resistor R8, a resistor R15, a resistor R10, a resistor R14, a voltage transformer PT2, a resistor R13, a resistor R9 and a capacitor C5, and the other current and voltage acquisition unit includes a current transformer CT3, a resistor R21, a capacitor C8, a capacitor C10, a resistor R17, a resistor R23, a resistor R19, a resistor R22, a voltage transformer PT3, a resistor R20, a resistor R18 and a capacitor C9;

[0060] Please refer to Figure 4 The signal conversion unit includes a signal conversion chip U2, the model of the signal conversion chip U2 is ADE7758, the fifth pin and the sixth pin of the signal conversion chip U2 are both electrically connected to the output end of the current transformer CT1, the sixteenth pin of the signal conversion chip U2 is electrically connected to the output end of the voltage transformer PT1, and the eighteenth pin, the twenty-first pin, the twenty-second pin, the twenty-third pin and the twenty-fourth pin of the signal conversion chip U2 are all electrically connected to the control module 4.

[0061] The signal conversion unit also includes a capacitor C14, a resistor R28, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a crystal oscillator XT1, a capacitor C12, a capacitor C13, a resistor R34 and a capacitor C15. For the specific connection relationship between the components, please refer to Figure 4 Signal conversion chip U2 serves as the main module for conversion functions. Capacitor C14 serves as a decoupling capacitor for the internal reference voltage, with one end connected to ground. Resistor R34 and capacitor C15 are used to connect the neutral point to ground and absorb abnormal interference signals. Resistors R28, R30, R31, R32, and R33 serve as current-limiting resistors and are connected to the hardware SPI interface of the control module to achieve data interaction. Crystal oscillator XT1, capacitor C12, and capacitor C13 form an oscillation circuit to provide a clock signal for conversion chip U2.

[0062] The current transformer CT1 is converted into a voltage signal through a high-precision power resistor and adopts differential input to improve the ability to resist common-mode interference. After filtering, it is input to the current input terminal of the control module 4. The voltage sampling passes through a voltage transformer PT1, and a corresponding voltage value is output through a current / voltage conversion circuit. After a first-level anti-aliasing filter, it is input to the voltage input terminal of the control module 4. The control module 4 performs simple calculation and analysis on the voltage and current values, and transmits the voltage, current, power, etc. to the control module 4 through the SPI bus.

[0063] Please refer to Figure 5 The control module 4 includes a main control chip U5, the GPRS communication module 5 includes a GPRS chip U6, and the temperature acquisition circuit 3 includes a resistor R35, a chip U4, a resistor R36, a resistor R37, a resistor R41, a thermistor F1, a resistor R39, a resistor R40, a resistor R38, a resistor R42 and a chip U3. For the specific connection relationship between the various components, please refer to Figure 5 ; Temperature acquisition adopts the bridge temperature measurement method. Resistor R35 and chip U4 form a reference voltage module to provide a stable and high-precision voltage value; Resistor R36, resistor R37, and resistor R41 are high-precision, low-temperature drift resistors, and form a bridge circuit with thermistor F1 (PT1000); Resistor R39, resistor R40, resistor R38, resistor R42 and chip U3 form a differential sampling op amp circuit, which provides the sampled voltage value to the main control chip U5, and the main control chip U5 performs data analysis and processing. At the same time, the data obtained by the main control chip U5 through the SPI interface is encrypted by its own protocol and transmitted remotely through the GPRS chip U6.

[0064] The low-voltage branch line 6 in the power distribution room is used as the signal source, and multiple signal acquisition modules are integrated with a built-in microprocessor to form the main body of the device. The main body of the device is distributed throughout the power distribution room to enable data upload and cloud analysis at each monitoring point, build an information network table, and generate an operation and maintenance cycle table.

[0065] In summary, the utility model provides a fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines. By setting a voltage and current acquisition circuit, a frequency and phase acquisition circuit, a temperature acquisition circuit, a control module and a GPRS communication module, the voltage and current acquisition circuit respectively acquires the voltage and current data of each low-voltage branch line, and transmits the acquired effective information of current and voltage to the control module; the temperature acquisition circuit acquires the temperature of each low-voltage branch line, and transmits the acquired temperature information to the control module; the frequency and phase acquisition circuit performs frequency and phase information fitting acquisition and transmits it to the control module; the control module performs data integration and analysis, and uploads the data to the cloud platform through the GPRS communication module, so that the various electrical parameters of the low-voltage branch lines in the distribution room can be monitored in real time.

[0066] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A fusion terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines, characterized by: It includes a voltage and current acquisition circuit, a frequency and phase acquisition circuit, a temperature acquisition circuit, a control module and a GPRS communication module. The input end of the voltage and current acquisition circuit, the input end of the frequency and phase acquisition circuit and the input end of the temperature acquisition circuit are all electrically connected to the low-voltage branch line of the distribution room. The control module is respectively electrically connected to the output end of the voltage and current acquisition circuit, the output end of the frequency and phase acquisition circuit, the output end of the temperature acquisition circuit and the input end of the GPRS communication module.

2. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 1 is characterized in that: The frequency phase acquisition circuit includes a rectifier bridge, a diode D6, a voltage divider unit, a transistor Q1 and a photoelectric coupler U1. One end of the light source of the photoelectric coupler U1 is electrically connected to the emitter of the transistor Q1, the other end of the light source of the photoelectric coupler U1 is electrically connected to the voltage divider unit, and the other end of the light source of the photoelectric coupler U1 and the voltage divider unit are both grounded. One end of the light receiver of the photoelectric coupler U1 is electrically connected to the control module, and the other end of the light receiver of the photoelectric coupler U1 is grounded. The voltage divider unit is electrically connected to the rectifier bridge through the diode D6. The first end of the rectifier bridge is electrically connected to the A phase line, the second end of the rectifier bridge is electrically connected to the neutral line, the third end of the rectifier bridge is grounded, the fourth end of the rectifier bridge is electrically connected to the collector of the transistor Q1, and the base of the transistor Q1 is electrically connected to the voltage divider unit.

3. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 2 is characterized in that: The voltage divider unit includes a resistor R24 ​​and a resistor R29, one end of the resistor R24 ​​is electrically connected to the cathode of the diode D6, the other end of the resistor R24 ​​is electrically connected to one end of the resistor R29 and the base of the transistor Q1, respectively, the other end of the resistor R29 is electrically connected to the other end of the light source of the photocoupler U1, and the other end of the resistor R29 is grounded.

4. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 3 is characterized in that: The voltage divider unit also includes a voltage regulator tube D8, the cathode of the voltage regulator tube D8 is electrically connected to the other end of the resistor R24 ​​and one end of the resistor R29 respectively, the anode of the voltage regulator tube D8 is electrically connected to the other end of the resistor R29 and the other end of the light source of the photocoupler U1 respectively, and the anode of the voltage regulator tube D8 is grounded.

5. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 4 is characterized in that: The voltage divider unit also includes a capacitor C11, one end of which is electrically connected to the cathode of the voltage regulator tube D8, the other end of the resistor R24, and one end of the resistor R29, respectively. The other end of the capacitor C11 is electrically connected to the anode of the voltage regulator tube D8 and the other end of the light source of the photocoupler U1, and the other end of the capacitor C11 is grounded.

6. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 2 is characterized in that: The frequency phase acquisition circuit further includes a resistor R27 and a diode D7, one end of the resistor R27 is electrically connected to the voltage divider unit, the other end of the resistor R27 is electrically connected to the anode of the diode D7, and the cathode of the diode D7 is electrically connected to the base of the transistor Q1.

7. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 2 is characterized in that: The frequency phase acquisition circuit also includes a resistor R25 and a diode D5. One end of the resistor R25 is electrically connected to the collector of the transistor Q1, the other end of the resistor R25 is electrically connected to the cathode of the diode D5, and the anode of the diode D5 is electrically connected to the third and fourth ends of the rectifier bridge respectively.

8. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 2 is characterized in that: The frequency phase acquisition circuit also includes a resistor R11 and a resistor R16, one end of the resistor R11 is electrically connected to the fourth end of the rectifier bridge, the other end of the resistor R11 is electrically connected to one end of the resistor R16 and the collector of the transistor Q1, respectively, the other end of the resistor R16 is electrically connected to the third end of the rectifier bridge, and the other end of the resistor R16 is grounded.

9. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 1 is characterized in that: The voltage and current acquisition circuit includes a signal conversion unit and multiple current and voltage acquisition units for acquiring the current and voltage on the low-voltage branch lines of the power distribution room. The number of the current and voltage acquisition units is the same as the number of phase lines in the frequency and phase acquisition circuit; The current and voltage acquisition unit includes a current transformer CT1 and a voltage transformer PT1. The acquisition end of the current transformer CT1 and the acquisition end of the voltage transformer PT1 are both electrically connected to the low-voltage branch line of the distribution room. The output end of the current transformer CT1 and the output end of the voltage transformer PT1 are both electrically connected to the signal conversion unit, and the signal conversion unit is electrically connected to the control module.

10. The integrated terminal device for multi-channel comprehensive status monitoring and diagnosis of substation lines according to claim 9 is characterized in that: The signal conversion unit includes a signal conversion chip U2, the model of the signal conversion chip U2 is ADE7758, the fifth pin and the sixth pin of the signal conversion chip U2 are both electrically connected to the output end of the current transformer CT1, the sixteenth pin of the signal conversion chip U2 is electrically connected to the output end of the voltage transformer PT1, and the eighteenth pin, the twenty-first pin, the twenty-second pin, the twenty-third pin and the twenty-fourth pin of the signal conversion chip U2 are all electrically connected to the control module.

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