CN216451187U

CN216451187U - Transmission line comprehensive state monitoring system

Info

Publication number: CN216451187U
Application number: CN202123424186.8U
Authority: CN
Inventors: 宋昌举; 谭波
Original assignee: State Grid Corp of China SGCC; Wanzhou Power Supply Co of State Grid Chongqing Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Wanzhou Power Supply Co of State Grid Chongqing Electric Power Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-06
Anticipated expiration: 2031-12-31

Abstract

The utility model provides a power transmission line comprehensive state monitoring system which comprises a sensor unit, a control transmission unit, an online power supply unit and a remote monitoring unit, wherein the sensor unit is used for detecting the state of a power transmission line; the sensor unit comprises a current transformer, a voltage transformer, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a particulate matter concentration sensor and a preprocessing circuit; the current transformer, the voltage transformer, the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor and the particulate matter concentration sensor are connected with the input end of the preprocessing circuit, and the output end of the preprocessing circuit is connected with the input end of the control transmission unit; the online power supply unit comprises a power-taking current transformer CT1, a rectifying circuit REC1, a filter circuit FIL1, an open-circuit protection circuit, an overvoltage protection circuit, a current adjusting circuit, a lithium battery, a voltage stabilizing circuit, a battery management circuit and a switching control circuit; the power transmission line self-monitoring and environment parameter uploading device can monitor the power transmission line self and environment parameters in real time and upload the parameters in time.

Description

Transmission line comprehensive state monitoring system

Technical Field

The utility model relates to an electric power monitoring system, in particular to a comprehensive state monitoring system of a power transmission line.

Background

The power transmission line is one of the most important devices in the power system, and the parameters of the power transmission line need to be monitored in real time, so that accurate operation and maintenance measures are facilitated. For the monitoring of transmission line, the traditional mode is through patrolling and examining the mode, and the staff patrols and records transmission line according to regular or aperiodic promptly, and this kind of mode is extravagant the manpower, and the safety risk is high, and more importantly monitoring accuracy is low, often appears louing to examine (not staff's omission, but patrols and has the interval to the parameter does not last, is unstable).

Along with the development of technique, the on-line monitoring mode has been proposed gradually, and the on-line monitoring mode is at transmission line setting sensor, then uploads data in real time, and the defect of conventional art has been avoided to this kind of mode, but, among the current monitoring system, each sensor and data transmission device generally adopt the battery or get one or several kinds of in the electricity on line and combine together, among the prior art, get the electricity on line from transmission line and use very extensively, nevertheless, still have following problem: when the current obtained on line has overcurrent but the overcurrent value does not reach the overcurrent protection threshold value, the existing equipment cannot perform corresponding current adjustment, so that the current equipment is influenced, in addition, the existing switching circuit of the on-line power supply and the standby battery is complicated, and the stability is not good if the structure is simplified; on the other hand, if the joint of the existing current transformer is loosened due to some reasons, such as vibration, the secondary side of the current transformer is easy to open when the current transformer is used for taking electricity, and therefore serious potential safety hazards exist.

Therefore, in order to solve the above technical problems, it is necessary to provide a new technical means.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a power transmission line comprehensive state monitoring system, which can monitor and upload power transmission line parameters and environmental parameters in real time, and each power consumption device can obtain continuous and stable electric energy in the monitoring process, and avoid potential safety hazards in power supply, thereby effectively ensuring continuity and accuracy of final monitoring data, and facilitating accurate operation and maintenance measures.

The utility model provides a power transmission line comprehensive state monitoring system which comprises a sensor unit, a control transmission unit, an online power supply unit and a remote monitoring unit, wherein the sensor unit is used for detecting the state of a power transmission line;

the sensor unit is used for monitoring the parameters of the power transmission line, the output end of the sensor unit is connected to the input end of the control transmission unit, the control transmission unit is in communication connection with the remote monitoring unit, and the online power supply unit supplies power to the sensor unit and the control transmission unit;

the sensor unit comprises a current transformer, a voltage transformer, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a particulate matter concentration sensor and a preprocessing circuit; the current transformer and the voltage transformer are used for monitoring parameters of the power transmission line, the current transformer can also be provided with an open-circuit protection circuit, the voltage transformer is provided with the existing short-circuit protection circuit, parameters of sensors such as humidity, temperature, wind speed, wind direction and particulate matter concentration belong to environmental parameters, and the parameters are used for performing auxiliary analysis on accumulated dirt and ice coating of the power transmission line;

the current transformer, the voltage transformer, the temperature sensor, the humidity sensor, the wind speed sensor, the wind direction sensor and the particulate matter concentration sensor are connected with the input end of the preprocessing circuit, and the output end of the preprocessing circuit is connected with the input end of the control transmission unit;

the online power supply unit comprises a power-taking current transformer CT1, a rectifying circuit REC1, a filter circuit FIL1, an open-circuit protection circuit, an overvoltage protection circuit, a current adjusting circuit, a lithium battery, a voltage stabilizing circuit, a battery management circuit and a switching control circuit;

the power-taking current transformer CT1 is a straight-through current transformer and is arranged on a power transmission line, the output end of the power-taking current transformer CT1 is connected with the input end of a rectifying circuit REC1, the output end of the rectifying circuit REC1 is connected with the input end of a filter circuit FIL1, the output end of the filter circuit FIL1 is connected with the input end of an overvoltage protection circuit, the output end of the overvoltage protection circuit is connected with the input end of a current adjusting circuit, the output end of the current adjusting circuit is connected with the input end of a voltage stabilizing circuit, and the output end of the voltage stabilizing circuit supplies power to a load; the detection output end con2 of the overvoltage protection circuit is connected with the input end of the control transmission unit;

open circuit protection circuit sets up in current transformer CT 1's secondary side for open circuit to current transformer CT 1's secondary side detects and carries out the protection of opening a way when opening a way, open circuit protection circuit's detection output con1 is connected with control transmission unit's input, switching control circuit's first control end and second control end are connected in current adjustment circuit's control output, and switching control circuit's input is connected in the positive pole of lithium cell, and switching control circuit's output is to the load power supply, and battery management circuit's power input end is connected in current adjustment circuit, and battery management circuit's power output end is connected in the positive pole of lithium cell, and battery management circuit still detects the voltage of lithium cell and carries out charge-discharge management, battery management circuit and control transmission unit communication connection.

Further, the control transmission unit comprises a central control circuit, a GPS positioning circuit, a Flash memory, a GPS time service circuit and a wireless communication module;

the input end of the central control circuit is connected with the output end of the preprocessing circuit, the central control circuit is connected with the GPS time service circuit and the GPS positioning circuit, the central control circuit is in communication connection with the Flash memory, the central control circuit is in communication connection with the remote monitoring unit through the mobile communication module, and the central control circuit is further connected with the detection output end con2 of the overvoltage protection circuit and the detection output end con1 of the open-circuit protection circuit.

Further, the open-circuit protection circuit comprises a diode D2, a diode D3, an optocoupler G1, a resistor R19, a resistor R20, a resistor R18, a resistor R17, a capacitor C4, a capacitor C5, a thyristor Q10 and a voltage regulator tube ZD 3;

the anode of a diode D2 is connected to the dotted terminal of a secondary side coil of a current transformer CT1, the cathode of the diode D2 is grounded after being connected in series with a resistor R19 and a resistor R20, the common connection point of the resistor R19 and the resistor R20 is connected to the cathode of a voltage-regulator tube ZD3, the anode of the voltage-regulator tube ZD3 is connected to the anode of a light-emitting diode of an optocoupler G1 through a resistor R18, the cathode of the light-emitting diode of the optocoupler G1 is connected to the control electrode of a thyristor Q10, the anode of the voltage-regulator tube 3 is grounded through a capacitor C4, the control electrode of a thyristor Q10 is grounded through a capacitor C5, the anode of the thyristor Q10 is connected to the dotted terminal of the current transformer CT1, the cathode of the thyristor Q10 is grounded through a resistor R17, the emitter of the optocoupler G1 is grounded, the collector of a phototransistor of the optocoupler G1 is connected to the cathode of a diode D3, and the anode of the diode D3 is used as the detection output terminal 1 of an open-circuit protection circuit.

Further, the overvoltage detection protection circuit comprises a PMOS tube Q1, a delay control circuit and an overvoltage detection control circuit;

the source of the PMOS transistor Q1 is connected to the output end of the filter circuit FIL1, the drain of the PMOS transistor Q1 is connected to the input end of the current adjusting circuit, the gate of the PMOS transistor Q1 is connected to the control output end of the delay control circuit, and the overvoltage detection control circuit is configured to detect the source input voltage of the PMOS transistor Q1 and output a high level to the control input end of the delay control circuit when the input voltage is greater than a set value.

Further, the delay control circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R12, a capacitor C2, a transistor Q4, a diode D4 and a transistor Q3;

one end of a resistor R4 is connected to the source of a PMOS tube Q1, the other end of the resistor R4 is grounded through a capacitor C1, the common connection point of a resistor R4 and a capacitor C1 is connected to the base of a transistor Q4 through the resistor R12, the collector of the transistor Q4 is connected to the gate of the PMOS tube Q1 through a resistor R11, the gate of a PMOS tube Q1 is connected to the source of the PMOS tube Q1 through a resistor R5, the emitter of the transistor Q4 is grounded, the collector of the transistor Q3 is connected to the common connection point of the resistor R4 and the capacitor C1, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 serves as the control input end of the delay control circuit, the cathode of a diode D4 is connected to the collector of the transistor Q3, and the anode of the diode D4 serves as the detection output end con2 of the overvoltage protection circuit.

Further, the overvoltage detection control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R13, a resistor R14, a voltage regulator ZD2 and a P-type triode Q2;

one end of a resistor R1 is connected with a source electrode of a PMOS tube Q1, the other end of the resistor R1 is connected with a negative electrode of a voltage regulator tube ZD2, an anode of the voltage regulator tube ZD2 is grounded through a resistor R14, an emitter of a triode Q2 is connected with a source electrode of a PMOS tube Q1, a base electrode of the triode Q2 is connected with a negative electrode of the voltage regulator tube ZD2, a collector of the triode Q2 is grounded after being connected in series with a resistor R13 through a resistor R2, a common connection point of the resistor R2 and the resistor R13 is connected with one end of the resistor R3, and the other end of the resistor R3 is used as a control output end of the overvoltage detection control circuit.

Further, the current adjusting circuit comprises an NMOS transistor Q6, a resistor R6, a capacitor C2, a voltage regulator ZD1, a resistor R7, a resistor R8, a diode D1, a resistor R9, and a triode Q5;

the drain of the NMOS switch Q6 is used as the input end of the current regulation circuit and connected to the output end of the overvoltage protection circuit, the source of the NMOS transistor Q6 is connected to the anode of the diode D1, the cathode of the diode D1 is used as the output end of the current regulation circuit, the drain of the NMOS transistor Q6 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point of the resistor R6 and the capacitor C2 is connected to the gate of the NMOS transistor Q6, the gate of the NMOS transistor Q6 is connected to the cathode of the regulator ZD1, the anode of the regulator ZD1 is grounded, the source of the NMOS transistor Q6 is grounded after being connected in series with the resistor R9 through the resistor R7, the common connection point of the resistor R7 and the resistor R9 is connected to the base of the triode Q5, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected to the gate of the NMOS transistor Q6 through the resistor R8, and the common connection point of the resistor R6 and the capacitor C2 is used as the control output end of the current detection circuit.

Further, the switching control circuit comprises a resistor R10, a resistor R15, a resistor R16, a PMOS tube Q7, a thyristor Q9 and a P-type triode Q8;

the positive electrode of the thyristor Q9 is connected to the positive electrode of the lithium battery as the input end of the switching control circuit, the negative electrode of the thyristor Q9 is connected to the source electrode of the PMOS tube Q7, the drain electrode of the PMOS tube Q7 is connected to the negative electrode of the diode D1, the drain electrode of the PMOS tube Q7 is grounded through the capacitor C3, the source electrode of the PMOS tube Q7 is connected to the gate electrode of the PMOS tube Q7 through the resistor R16, the gate electrode of the PMOS tube Q7 is connected to the emitter electrode of the transistor Q8, the collector electrode of the transistor Q8 is grounded through the resistor R15, the base electrode of the transistor Q8 is connected to the common connection point of the resistor R6 and the capacitor C2 as the first control end of the switching control circuit, the control electrode of the thyristor Q9 is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the common connection point of the resistor R6 and the capacitor C2 as the second control end of the switching control circuit.

Further, the battery management circuit is a CN3765 chip, and a power supply terminal of the battery management circuit is connected to the anode of the diode D1.

Further, the remote monitoring unit comprises a monitoring host, an audible and visual alarm, a touch display and a storage server;

the monitoring host is in communication connection with the control transmission unit, the monitoring host is connected with the audible and visual alarm, and the monitoring host is in communication connection with the touch display and the storage server.

The utility model has the beneficial effects that: according to the utility model, the power transmission line and the environmental parameters can be monitored in real time and uploaded in time, each power utilization device can obtain continuous and stable electric energy in the monitoring process, potential safety hazards in power supply are avoided, the continuity and accuracy of final monitoring data are effectively ensured, and accurate operation and maintenance measures are facilitated.

Drawings

The utility model is further described below with reference to the following figures and examples:

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of an online power supply unit according to the present invention.

Fig. 3 is a schematic diagram of an overvoltage protection circuit, a current regulation circuit and a switching control circuit according to the present invention.

Fig. 4 is a schematic diagram of an open circuit protection circuit of the present invention.

Detailed Description

The utility model is described in further detail below with reference to the drawings of the specification:

the sensor unit comprises a current transformer, a voltage transformer, a temperature sensor, a humidity sensor, a wind speed sensor, a wind direction sensor, a particulate matter concentration sensor and a preprocessing circuit;

open circuit protection circuit sets up in current transformer CT 1's secondary side for open circuit to current transformer CT 1's secondary side detects and carries out the protection of opening a way when opening a way, open circuit protection circuit's detection output con1 is connected with control transmission unit's input, switching control circuit's first control end and second control end are connected in current adjustment circuit's control output, and switching control circuit's input is connected in the positive pole of lithium cell, and switching control circuit's output is to the load power supply, and battery management circuit's power input end is connected in current adjustment circuit, and battery management circuit's power output end is connected in the positive pole of lithium cell, and battery management circuit still detects the voltage of lithium cell and carries out charge-discharge management, battery management circuit and control transmission unit communication connection. The electric power transmission line monitoring system comprises a preprocessing circuit, a plurality of sensors, a power transmission line, a power consumption device, a power supply and a power supply, wherein the preprocessing circuit is composed of an existing filter circuit and an existing analog-to-digital conversion circuit, each sensor corresponds to one group of filter circuit and the analog-to-digital conversion circuit, through the structure, the power transmission line and environmental parameters can be monitored in real time and uploaded in time, in addition, each power consumption device can obtain continuous and stable electric energy in the monitoring process, potential safety hazards in power supply are avoided, the continuity and the accuracy of final monitoring data are effectively guaranteed, and accurate operation and maintenance measures are facilitated.

In this embodiment, the control transmission unit includes a central control circuit, a GPS positioning circuit, a Flash memory, a GPS time service circuit, and a wireless communication module;

the input end of the central control circuit is connected with the output end of the preprocessing circuit, the central control circuit is connected with a GPS time service circuit and a GPS positioning circuit, the central control circuit is connected with a Flash memory in a communication way, the central control circuit is connected with a remote monitoring unit in a communication way through a mobile communication module, the central control circuit is also connected with a detection output end con2 of an overvoltage protection circuit and a detection output end con1 of an open-circuit protection circuit, wherein the GPS positioning circuit is used for acquiring the position of a current monitoring node and facilitating accurate scheduling of a monitoring center, the GPS time service circuit is used for providing an accurate clock signal for the central control circuit and ensuring the working stability of the whole system, the Flash memory is used for storing programs necessary for the operation of the central control circuit, the central control circuit belongs to the prior art, the STC1F2K60S2 single chip microcomputer is adopted in the central control circuit, and the wireless communication module adopts the existing 4G or 5G communication module, the wireless private network module of electric power can also be adopted, a ZigBee module, a UBW module and the like can also be adopted, and relays need to be erected only by the two modules, and the two modules belong to the prior art.

In this embodiment, the open-circuit protection circuit includes a diode D2, a diode D3, an optocoupler G1, a resistor R19, a resistor R20, a resistor R18, a resistor R17, a capacitor C4, a capacitor C5, a thyristor Q10, and a voltage regulator ZD 3;

the anode of a diode D2 is connected to the dotted terminal of a secondary side coil of a current transformer CT1, the cathode of the diode D2 is grounded after being connected in series with a resistor R19 and a resistor R20, the common connection point of the resistor R19 and the resistor R20 is connected to the cathode of a voltage-regulator tube ZD3, the anode of the voltage-regulator tube ZD3 is connected to the anode of a light-emitting diode of an optocoupler G1 through a resistor R18, the cathode of the light-emitting diode of the optocoupler G1 is connected to the control electrode of a thyristor Q10, the anode of the voltage-regulator tube 3 is grounded through a capacitor C4, the control electrode of a thyristor Q10 is grounded through a capacitor C5, the anode of the thyristor Q10 is connected to the dotted terminal of the current transformer CT1, the cathode of the thyristor Q10 is grounded through a resistor R17, the emitter of the optocoupler G1 is grounded, the collector of a phototransistor of the optocoupler G1 is connected to the cathode of a diode D3, and the anode of the diode D3 is used as the detection output terminal 1 of an open-circuit protection circuit; the diode D2 is used for rectification, when the secondary side is open-circuited, the diode generates induction high voltage, the high voltage enables the voltage regulator tube ZD3 to be conducted, the optical coupler G1 is also conducted along with the conduction, so that the conduction of the controllable silicon Q10 is triggered, a new closed loop is further formed on the secondary side of the current transformer, a good protection effect is achieved, after the optical coupler G1 is conducted, the potential of the anode of the diode D3 is reduced, when the central control circuit identifies the potential, the current transformer CT1 is executed with open-circuit protection, at the moment, the PMOS tube Q1 has no output, the central control circuit identifies the current fault and sends alarm information to the monitoring host, and the controllable silicon Q10 adopts bidirectional controllable silicon.

In this embodiment, the overvoltage detection protection circuit includes a PMOS transistor Q1, a delay control circuit, and an overvoltage detection control circuit;

Specifically, the method comprises the following steps: the delay control circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R12, a capacitor C2, a triode Q4, a diode D4 and a triode Q3;

The overvoltage detection control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R13, a resistor R14, a voltage regulator tube ZD2 and a P-type triode Q2;

one end of a resistor R1 is connected with a source electrode of a PMOS tube Q1, the other end of the resistor R1 is connected with a negative electrode of a voltage regulator tube ZD2, an anode of the voltage regulator tube ZD2 is grounded through a resistor R14, an emitter of a triode Q2 is connected with a source electrode of a PMOS tube Q1, a base electrode of the triode Q2 is connected with a negative electrode of the voltage regulator tube ZD2, a collector of the triode Q2 is grounded after being connected in series with a resistor R13 through a resistor R2, a common connection point of the resistor R2 and the resistor R13 is connected with one end of the resistor R3, and the other end of the resistor R3 is used as a control output end of the overvoltage detection control circuit. When the source of the PMOS transistor Q1 has voltage input, the capacitor C1 is charged through the resistor R4, at this time, the base voltage of the triode Q4 does not reach the saturation conducting voltage, the triode Q4 is cut off, in the charging process of the capacitor C1, the overvoltage detection circuit performs voltage detection, when the voltage is normal, a reverse bias voltage does not exist between the base and the emitter of the triode Q2, the triode Q2 is cut off, at this time, the triode Q3 is cut off, after the capacitor C1 is charged, the triode Q4 is turned on, the PMOS transistor Q1 is turned on to supply power to the next time, when the voltage is overvoltage, the voltage regulator ZD2 is turned on to pull down the base voltage of the triode Q2, and a high-level output is provided between the common connection point of the resistor R2 and the resistor R3, so that the triode Q3 is turned on to cut off the triode Q4 and further cut off the PMOS transistor Q1, thereby realizing overvoltage protection; when the triode Q3 is conducted, the potential of the anode of the diode D4 is pulled low, the central control circuit identifies the low potential, the overvoltage protection is executed currently, and the central control circuit sends the information to the monitoring host, so that accurate operation and maintenance are facilitated.

In this embodiment, the current adjusting circuit includes an NMOS transistor Q6, a resistor R6, a capacitor C2, a voltage regulator ZD1, a resistor R7, a resistor R8, a diode D1, a resistor R9, and a transistor Q5;

the drain of the NMOS switch Q6 is used as the input end of the current regulation circuit and connected to the output end of the overvoltage protection circuit, the source of the NMOS transistor Q6 is connected to the anode of the diode D1, the cathode of the diode D1 is used as the output end of the current regulation circuit, the drain of the NMOS transistor Q6 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded through the capacitor C2, the common connection point of the resistor R6 and the capacitor C2 is connected to the gate of the NMOS transistor Q6, the gate of the NMOS transistor Q6 is connected to the cathode of the regulator ZD1, the anode of the regulator ZD1 is grounded, the source of the NMOS transistor Q6 is grounded after being connected in series with the resistor R9 through the resistor R7, the common connection point of the resistor R7 and the resistor R9 is connected to the base of the triode Q5, the emitter of the triode Q5 is grounded, the collector of the triode Q5 is connected to the gate of the NMOS transistor Q6 through the resistor R8, and the common connection point of the resistor R6 and the capacitor C2 is used as the control output end of the current detection circuit. When the PMOS tube Q1 has output, the NMOS tube is conducted, when overcurrent exists but the current value does not reach the overcurrent protection limit value, at the moment, the triode Q5 is conducted, so that the grid voltage of the NMOS tube Q6 is reduced, the NMOS tube Q6 is partially conducted, the current output is reduced, and the current adjustment is completed, wherein the resistor R7 is realized by adopting the existing adjustable resistor and is used for adjusting the conducting voltage of the triode Q5.

In this embodiment, the switching control circuit includes a resistor R10, a resistor R15, a resistor R16, a PMOS transistor Q7, a thyristor Q9, and a P-type triode Q8;

the positive electrode of the thyristor Q9 is connected to the positive electrode of the lithium battery as the input end of the switching control circuit, the negative electrode of the thyristor Q9 is connected to the source electrode of the PMOS tube Q7, the drain electrode of the PMOS tube Q7 is connected to the negative electrode of the diode D1, the drain electrode of the PMOS tube Q7 is grounded through the capacitor C3, the source electrode of the PMOS tube Q7 is connected to the gate electrode of the PMOS tube Q7 through the resistor R16, the gate electrode of the PMOS tube Q7 is connected to the emitter electrode of the transistor Q8, the collector electrode of the transistor Q8 is grounded through the resistor R15, the base electrode of the transistor Q8 is connected to the common connection point of the resistor R6 and the capacitor C2 as the first control end of the switching control circuit, the control electrode of the thyristor Q9 is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the common connection point of the resistor R6 and the capacitor C2 as the second control end of the switching control circuit. The thyristor Q9 has a triggering characteristic, that is, the Q9 must be triggered to conduct, otherwise, the thyristor Q9 is not conducted, at this time, the thyristor Q9 is triggered to conduct when the whole system is not powered, that is, the overvoltage protection circuit does not enter a power supply state, and the lithium battery operates earlier than an online power supply loop, so as to ensure the power supply order and the power supply stability, when the PMOS tube Q1 has an output, the voltage of the lithium battery is loaded on the source of the PMOS tube Q7, at this time, because the base voltage of the triode Q8 is greater than the emitter voltage and is not reverse biased, the PMOS tube Q7 is cut off, when the PMOS tube Q1 is switched from output to no output (including overvoltage protection, current transformer CT1 fault and the like), at this time, the base of the triode Q8 is in a low level state, so that the reverse bias is conducted, and then the Q7 is conducted, and the lithium battery enters a power supply state, so that the switching can be substantially seamless, when the output of the PMOS tube Q1 is recovered, although the Q9 is turned on, the Q8 is recovered to be cut off, the Q7 is also recovered to be cut off, and the lithium battery is not supplied with power any more.

In this embodiment, the battery management circuit is a CN3765 chip, a power supply end of the battery management circuit is connected to an anode of the diode D1, and the battery management circuit is further connected to the central control circuit in a communication manner, and is configured to feed back real-time electric quantity information of the lithium battery.

In this embodiment, the remote monitoring unit includes a monitoring host, an audible and visual alarm, a touch display, and a storage server;

the monitoring host is in communication connection with the control transmission unit, the monitoring host is connected with the audible and visual alarm, the monitoring host is in communication connection with the touch display and the storage server, the monitoring host receives monitoring information uploaded by the central control circuit, if the voltage or the current of the power transmission line is larger than a set value, the monitoring host gives an alarm, the monitoring host displays the real-time monitoring information through the touch display, analysis is facilitated, the information is stored through the storage server, and follow-up analysis and calling are facilitated.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides a transmission line integrated state monitoring system which characterized in that: the system comprises a sensor unit, a control transmission unit, an online power supply unit and a remote monitoring unit;

open circuit protection circuit sets up in current transformer CT 1's secondary side for open circuit to current transformer CT 1's secondary side detects and carries out the open circuit protection when opening a way, open circuit protection circuit's detection output con1 is connected with control transmission unit's input, switching control circuit's first control end and second control end are connected in current adjustment circuit's control output, and switching control circuit's input is connected in the positive pole of lithium cell, and switching control circuit's output is to the load power supply, and battery management circuit's power input end is connected in current adjustment circuit, and battery management circuit's power output end is connected in the positive pole of lithium cell, and battery management circuit still detects the voltage of lithium cell and carries out charge-discharge management, battery management circuit and control transmission unit communication connection.

2. The power transmission line integrated state monitoring system of claim 1, characterized in that: the control transmission unit comprises a central control circuit, a GPS positioning circuit, a Flash memory, a GPS time service circuit and a wireless communication module;

3. The power transmission line integrated state monitoring system of claim 1, characterized in that: the open-circuit protection circuit comprises a diode D2, a diode D3, an optocoupler G1, a resistor R19, a resistor R20, a resistor R18, a resistor R17, a capacitor C4, a capacitor C5, a thyristor Q10 and a voltage regulator tube ZD 3;

4. The power transmission line integrated state monitoring system of claim 1, characterized in that: the overvoltage detection protection circuit comprises a PMOS tube Q1, a delay control circuit and an overvoltage detection control circuit;

5. The power transmission line integrated state monitoring system of claim 4, characterized in that: the delay control circuit comprises a resistor R4, a resistor R5, a resistor R11, a resistor R12, a capacitor C2, a triode Q4, a diode D4 and a triode Q3;

6. The power transmission line integrated state monitoring system of claim 4, characterized in that: the overvoltage detection control circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R13, a resistor R14, a voltage regulator tube ZD2 and a P-type triode Q2;

one end of a resistor R1 is connected with a source electrode of a PMOS tube Q1, the other end of a resistor R1 is connected with a negative electrode of a voltage-regulator tube ZD2, the positive electrode of the voltage-regulator tube ZD2 is grounded through a resistor R14, an emitter electrode of a triode Q2 is connected with a source electrode of the PMOS tube Q1, a base electrode of the triode Q2 is connected with the negative electrode of the voltage-regulator tube ZD2, a collector electrode of the triode Q2 is grounded after being connected in series with a resistor R2 and a resistor R13, a common connection point of the resistor R2 and the resistor R13 is connected with one end of the resistor R3, and the other end of the resistor R3 is used as a control output end of the overvoltage detection control circuit.

7. The power transmission line integrated state monitoring system of claim 1, characterized in that: the current adjusting circuit comprises an NMOS tube Q6, a resistor R6, a capacitor C2, a voltage stabilizing tube ZD1, a resistor R7, a resistor R8, a diode D1, a resistor R9 and a triode Q5;

8. The power transmission line integrated state monitoring system of claim 7, characterized in that: the switching control circuit comprises a resistor R10, a resistor R15, a resistor R16, a PMOS (P-channel metal oxide semiconductor) transistor Q7, a controllable silicon Q9 and a P-type triode Q8;

9. The power transmission line integrated state monitoring system of claim 7, characterized in that: the battery management circuit is a CN3765 chip, and a power supply end of the battery management circuit is connected to the anode of the diode D1.

10. The system for monitoring the comprehensive state of the power transmission line according to claim 1, characterized in that: the remote monitoring unit comprises a monitoring host, an audible and visual alarm, a touch display and a storage server;