CN111665416A - Overhead line fault indicating device - Google Patents
Overhead line fault indicating device Download PDFInfo
- Publication number
- CN111665416A CN111665416A CN202010480578.7A CN202010480578A CN111665416A CN 111665416 A CN111665416 A CN 111665416A CN 202010480578 A CN202010480578 A CN 202010480578A CN 111665416 A CN111665416 A CN 111665416A
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- module
- charging
- fault indication
- line fault
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
Abstract
The invention provides a fault indicating device for a power transmission overhead line of a wind power plant, which comprises a power module, a charging module, a control module, a line fault indicating module, a charging current detecting module, a circuit fault indicating module and a communication module, wherein the charging module is used for charging the power module; the charging current detection module is used for detecting the working condition of the charging module, and when the charging module is determined to have a fault, the circuit fault indication module sends out a warning, so that the problem that the overhead line fault indication device cannot normally indicate due to the fault of the charging module is avoided. The communication module is used for communicating with the intelligent terminal, after the communication module is connected with the intelligent terminal, the attenuation condition of the standby battery can be checked through matched software, geographic position information and inspection date can be written into a memory of the control module, management is convenient, detection data comparison can be carried out through a line fault indicating device installed on the same power transmission line, and the accuracy of the line fault indicating device in measuring the current of the power transmission line is inspected.
Description
Technical Field
The invention relates to the technical field of wind power plant transmission line fault indication, in particular to a fault indication device applied to a wind power plant transmission overhead line.
Background
The fault indicator is an indicating device for detecting and indicating the fault of the transmission line, and is used for detecting and identifying whether the transmission line has the fault or not. When faults such as overcurrent, short circuit, grounding and the like occur to the power transmission line, the power transmission line fault indicator determines a fault section, a branch and a fault point by detecting and judging a fault state so as to facilitate maintenance and repair of line patrol workers. An outdoor power transmission line is usually erected in an overhead mode, and an overhead line fault indicating device is clamped on a cable of the overhead power transmission line through the acting force of a pressure spring. The fault indicator detects faults possibly occurring on the power transmission line at any time in real time, once the current of the power transmission line is abnormal, the device can select a turning or lighting mode to alarm through own judgment, and maintenance workers can rapidly determine a fault section according to the alarm display of the device to find out a fault point, so that the labor intensity of the maintenance workers is greatly reduced, the working efficiency is improved, the power failure time is shortened, and the reliability of power transmission is effectively improved.
The fault indicator obtains electric energy by means of power transmission line induction, and when the current in the power transmission line is small or the electric energy obtained by the power failure induction electricity is not enough to support the power utilization module, the fault indicator can work continuously and is powered by an internal standby battery. The inventor roughly counts the repaired fault indicator, most fault sources of the fault indicator are caused by battery attenuation, namely, after the fault indicator is used outdoors for years, the service life of a standby battery is seriously attenuated, the overall reliability is seriously affected, and the condition of the standby battery attenuation is difficult to discover. In addition, the fault indicator detection accuracy should also be certified periodically. At present, the means for detecting the functionality of the fault indicator and measuring the current accuracy of the power transmission line is to use a special test bed for detection, and the qualified power transmission line is reinstalled after the detection is finished and the maintenance is qualified. Because the operation is complicated, the time and the labor are wasted, and particularly, the fault indicator is applied to the fault indicator of the overhead line, the maintenance is rarely carried out after the fault indicator is erected, and the functionality and the reliability of the fault indicator cannot be effectively ensured.
Disclosure of Invention
The invention provides an overhead line fault indicating device which is convenient for finding faults of a standby battery.
The invention adopts the following technical scheme:
an overhead line fault indication device comprising: power module, the module of charging, control module and line fault indication module, its characterized in that still includes: the charging current detection module and the circuit fault indication module; the power supply module is used for acquiring electric energy from the power transmission line and supplying power to other power utilization modules; the charging module comprises a standby battery and a charging circuit, and the standby battery is electrically connected with the charging circuit; the line fault indication module is used for outputting an indication signal carrying the transmission line fault information provided by the control module; the charging current detection module is used for feeding back charging and discharging current data of the charging module to the control module, and the circuit fault indication module is used for outputting a charging module fault signal provided by the controller; the charging current detection module, the circuit fault indication module and the line fault indication module are respectively electrically connected with the control module.
The intelligent charging system further comprises a communication module, wherein the communication module is used for transmitting attenuation data of the charging module and detection data of the power transmission line to an external intelligent terminal, and the detection data of the power transmission line comprise the maximum current and the minimum current of the power transmission line within a period of time; the transmission line detection data are used for verifying the accuracy of the fault indicating device for detecting the transmission line data, and the communication module is in communication connection with the control module.
Further, the control module is provided with a memory, and the memory is used for storing installation geographic position information and inspection date.
Furthermore, the line fault indication module and the circuit fault indication module are both circuits provided with LED indicator lamps.
Further, the standby battery is a lithium battery.
The invention has the following positive effects:
the utility model provides an overhead line fault indicating device, overhead line fault indicating device who is equipped with charging current detection module and circuit fault indicating module, can detect backup battery charging current and discharge current in the module course of charging working to detect out backup battery's decay condition, when confirming that the module of charging has the trouble, send out the warning through circuit fault indicating module, the work of dismantling back inspection backup battery has been saved, also avoided leading to the problem that overhead line fault indicating device can not normally instruct because of the module trouble of charging. The circuit fault indication module and the circuit fault indication module are provided with LED indicating lamps, the service life is long, energy and electricity are saved, each module is provided with two paths of LED indicating circuits, the redundant design is realized, and when one module is damaged, the other module can also play a role in indicating; the spare battery adopts a lithium battery, has long service life, light weight, large capacity and long replacement period, and is suitable for outdoor use throughout the year. The overhead line fault indicating device is further provided with a communication module, the control module is provided with a storage, after the communication module is connected with the intelligent terminal, the standby battery attenuation condition can be checked by software matched with the intelligent terminal, the storage of the control module can be written in geographical position information and inspection date, management is convenient, detection data comparison can be carried out through the fault indicating device installed on the same power transmission line, and the accuracy of the current of the power transmission line measured by the fault indicating device is inspected.
Drawings
FIG. 1 is a functional block diagram of an embodiment of the present invention;
FIG. 2 is a pin diagram of a controller according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a charging module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a charging current sampling circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a discharge current sampling circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a backup battery voltage sampling circuit according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a line fault indication module and a circuit fault indication module according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a communication module connection according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the overhead line fault indicating apparatus includes: the charging device comprises a power supply module, a charging module, a control module, a line fault indication module, a charging current detection module and a circuit fault indication module;
the power supply module is used for acquiring electric energy from a power transmission line of a wind power plant and supplying power to the power utilization module, and the charging module, the control module, the line fault indication module, the charging current detection module and the circuit fault indication module shown in the figure are all power utilization modules; the line fault indication module is used for indicating when the control module detects the power transmission line fault of the wind power plant; the circuit fault indication module is used for indicating when the control module detects the fault of the charging module through the charging current detection module; the charging module comprises a standby battery and a charging circuit. The charging current detection module, the circuit fault indication module and the line fault indication module are electrically connected with the control module respectively.
The control module comprises a wind power plant transmission line detection circuit and a controller, the detection circuit acquires a current signal of a wind power plant transmission line by means of a current transformer, the current signal is sent to the controller, the controller digitizes the current signal after analog-to-digital conversion, the controller compares the digitized current signal with a preset threshold value, and when the current signal exceeds the threshold value, fault indication is carried out through a line fault indication circuit; the controller is a single chip microcomputer, as shown in fig. 2, the embodiment adopts STM32F103C8T6, the clock frequency can reach 72MHz at most, and the single chip microcomputer is internally integrated with an analog-to-digital converter, a serial communication unit, a general input/output interface and a FLASH; the analog-to-digital converter is used for converting the analog signal into a digital signal and processing data; the serial port communication unit is used for communicating with the outside and receiving and transmitting serial data; the general input/output interface is used for inputting level signals or outputting the level signals; the FLASH storage space is 64KB, except for part of the FLASH storage space used for storing program codes, the rest space can be used as a storage space which is not lost when the power failure occurs, and the obtained data can be stored, such as data received by external communication and data of abnormal power transmission lines of the wind power plant.
The power supply module acquires electric energy from a power transmission line of the wind power plant by means of induction of a current transformer, the output end of the power supply module is divided into two paths and is sent to each power utilization module to supply power to the power utilization modules, and the charging module, the control module, the line fault indication module, the charging current detection module and the circuit fault indication module shown in the figure 1 are all power utilization modules; the current of the power transmission line of the wind power plant is influenced by the load size and fluctuates, and when the current is too small to drive the power utilization module to utilize power, the power supply module is switched to supply power; the output ends of the charging module and the power supply module are respectively provided with a diode, and the cathode connecting point of the two diodes is used as a power supply output point.
The charging module comprises a charging circuit and a standby battery, the standby battery is a lithium battery, as shown in fig. 3, the charging circuit controls the charging process of the standby battery by taking a TP4056 chip as a core, the TP4056 is a constant current/constant voltage linear charger of the lithium battery, a PMOSFET structure is adopted in the charging circuit, the charging circuit has a thermal feedback function, the charging current can be automatically adjusted, the temperature of the chip is limited under the conditions of high-power operation or high-temperature environment temperature, the charging voltage is constant at 4.2V, the charging current can be set through a programming resistor, the charging current is reduced to one tenth of a set value after reaching the final charging voltage, and the TP4056 automatically terminates the charging cycle; when there is no input voltage, TP4056 automatically enters a low current state, reducing the battery leakage current below 2 uA. TP4056 may also be placed in shutdown mode when power is available, reducing the supply current to 55 uA.
In the embodiment, U4 is TP4056, the CE pin of U4 is a gating pin, and is gated at a high level, so that the pin is connected with POWER + of a POWER module; one end of the safety resistor R7 is connected with Power + of the Power supply module, and the other end of the safety resistor R7 is connected with a Power input pin Vcc of the U4; a Gnd pin of the U4 is connected with a power ground GND and a negative pole B-of the standby battery; r12 is a charging current sampling resistor, one end of which is connected with BAT pin of U4, and the other end is connected with the positive pole B + of the standby battery; the resistor R9 is a programming resistor, one end of the resistor R9 is connected with the PROG pin of the TP4056, and the other end of the resistor R9 is connected with the Gnd pin of the TP 4056; the TP4056 charging current is controlled by a programmed resistor, which has the following formula:
IBAT=VPROG/R9×1200
IBAT is a charging current, VPROG is a programming voltage, 1V during charging, R9 is a programming resistance, and a 2500mAh lithium battery is used as the backup battery in the present embodiment, and a resistance of 1.2k Ω is selected in view of the battery capacity and the charging speed.
As the improvement of the prior art, a charging current detection module is added, comprising: the charging current sampling circuit, the discharging current sampling circuit and the standby battery voltage sampling circuit are shown in a schematic diagram of the charging current sampling circuit in fig. 4, a forward input end of an operational amplifier U2 is connected with a BAT pin of U4, a reverse input end of the operational amplifier U2 is connected with a standby battery anode B +, a first end of a resistor R7 and a first end of a resistor R14, an output end of the operational amplifier U2 is connected with a second end of the resistor R14 and an input end of a controller analog-to-digital converter, a second end of the resistor R7 is connected with a power ground GND (ground), the circuit forms a proportional operational amplifier circuit, and a charging current signal obtained from a charging current sampling resistor R12 is amplified to reach a.
Fig. 5 is a schematic diagram of a discharge current sampling circuit, a forward input end of an operational amplifier U3 is connected to a positive electrode B + of a backup battery, a reverse input end is connected to a second end BPOWER + of a discharge current sampling resistor R13, a first end of a resistor R15 and a first end of a resistor R8, an output end is connected to a second end of the resistor R15 and an input end of a controller analog-to-digital converter, a second end of the resistor R8 is connected to a power ground GND, and the circuit constitutes a proportional operational amplifier circuit for amplifying a signal obtained from the discharge current sampling resistor R13 to reach a voltage range that can be recognized by a controller.
Fig. 6 is a schematic diagram of a standby battery voltage sampling circuit, wherein one end of R21 is connected to the positive electrode B + of the standby battery, the other end is connected to the first end of R22, the second end of R22 is connected to the power ground, and the first end of R22 is connected to the converter of the controller as a battery voltage sampling signal.
As shown in fig. 7, the line fault indication module and the circuit fault indication module both use ULN2803A as a core, and ULN2803 is an array series of eight NPN darlington connected transistors, which is particularly suitable for an interface between a low logic level digital circuit (such as TTL, CMOS or PMOS/NMOS) and a higher current/voltage requirement, and is widely applied to computers, lamps, relays, print hammers or other similar loads in industrial and consumer products. All devices have open collector outputs and freewheeling clamp diodes to suppress the transients. The design of the ULN2803 is compatible with the standard TTL family. Pins 1 to 8 of the chip are input pins, namely pins 1B-8B, pins 18 to 11 are output pins, namely pins 1C-8C, the input pins and the output pins form a one-to-one correspondence relationship, the logic is a NOT gate, and for example, when the input 1B is at a low level, a triode in the 1C is in saturated conduction; the loading capacity of the chip with the load can reach 500mA at most, and the chip with the load is enough to meet the use requirement. In this embodiment, the 4B pin of the chip is connected to the single chip IO port PA1, the 5B pin is connected to the single chip IO port PA2, the 6B pin of the chip is connected to the single chip IO port PA3, and the 7B pin is connected to the single chip IO port PA 4; the line fault indication module has two indicating lamps: the LED current limiting circuit comprises an LED1 and an LED2, wherein the anode of the LED1 is connected with the 4C pin of the U1, one end of a current limiting resistor R3 is connected with the cathode of the LED1, and the other end of the current limiting resistor R3 is connected with a power supply VCC; the anode of the LED2 is connected with the 5C pin of the U1, one end of a current-limiting resistor R4 is connected with the cathode of the LED1, and the other end of the current-limiting resistor R4 is connected with a power supply VCC; the circuit fault indicator lamps are two: the LED current limiting circuit comprises an LED3 and an LED4, wherein the anode of the LED3 is connected with a 6C pin of a U1, one end of a current limiting resistor R5 is connected with the cathode of an LED3, and the other end of the current limiting resistor R5 is connected with a power supply VCC; the anode of the LED4 is connected with the pin 7C of the U1, one end of the current limiting resistor R6 is connected with the cathode of the LED4, and the other end of the current limiting resistor R6 is connected with a power supply VCC. Line fault indication module and circuit fault indication module pilot lamp are two, are redundancy design, damage one and do not influence another's function, and after damaging one, another can also play the effect of instruction.
When the standby battery is used, the controller detects a discharge current and a battery voltage through the charging current detection module every a period of time, such as 20 milliseconds, after the standby battery is discharged for a period of time, the battery voltage is lowered from 4.1V to 4.0V, the total output electric energy in the period of time is counted, the total output electric energy is compared with a preset standby battery attenuation threshold, and when the total output electric energy is lower than the standby battery attenuation threshold, the controller records the total output electric energy; calculating the total output electric energy by taking the discharge current acquired each time multiplied by the time segment as the time segment electric energy of the time segment, and accumulating all the time segment electric energy to obtain the total output electric energy corresponding to the voltage reduction from 4.1V to 4.0V under the corresponding standby battery; in another case, referring to the case of charging, the controller detects a charging current and a backup battery voltage through the charging current detection module every time segment, such as 20 milliseconds, the backup battery voltage rises after a period of charging, such as from 3.8V to 3.9V, and counts the total input power in the period, the total input power is compared with a preset backup battery attenuation threshold, and when the total input power is lower than the backup battery attenuation threshold, the total input power is recorded; the total input electric energy is calculated by taking the charging current acquired each time multiplied by the time segment as the time segment electric energy of the time segment, and the accumulated electric energy of all the time segments is the total input electric energy corresponding to the voltage rise of the standby battery from 3.8V to 3.9F; when the attenuation recording times reach the recording times threshold value, such as 10 times, the controller controls the circuit fault indicator lamp to flash.
The overhead line fault indicating device provided with the charging current detection module and the circuit fault indicating module can detect the charging current and the discharging current of the standby battery in the working process of the charging module, thereby detecting the attenuation condition of the standby battery, when the charging module is determined to have faults, the circuit fault indicating module gives a warning, the work of checking the standby battery after disassembly is omitted, and the problem that the overhead line fault indicating device cannot normally indicate due to the fault of the charging module is also avoided. The circuit fault indication module and the circuit fault indication module are provided with LED indicating lamps, the service life is long, energy and electricity are saved, each module is provided with two paths of LED indicating circuits, the redundant design is realized, and when one module is damaged, the other module can also play a role in indicating; the spare battery adopts a lithium battery, has long service life, light weight, large capacity and long replacement period, and is suitable for outdoor use throughout the year.
Furthermore, a communication module used for communicating with the intelligent terminal is also arranged; the module is a WiFi communication circuit using ESP8266 as a core chip, as shown in fig. 8, a communication module U7 is electrically connected to a single chip microcomputer through a serial port, a USART1_ RX pin (31 pin) of the single chip microcomputer is connected to a TXD pin of U7, and a USART1_ TXD pin (30 pin) of a controller is connected to an RXD pin of U7.
During the use, intelligent terminal searches for the wiFi signal of this device like the cell-phone, inputs the password and accomplishes being connected of intelligent terminal and this device, and intelligent terminal opens supporting APP, can read current reserve battery decay condition through APP, can read wind-powered electricity generation field transmission line maximum current and minimum current of recent period, can write into control module's memory with some information like the longitude and latitude data of the geographical position information of mounted position, this check date for the inquiry is used next time. The device can also be used for installing a line fault indicating device which is calibrated in advance on the same wind power plant transmission line to obtain the maximum current and the minimum current of the wind power plant transmission line in a time period, then the maximum current and the minimum current obtained by the device in the same time period are compared, and if the deviation is large, the device needs to be detached for maintenance or replacement.
The overhead line fault indicating device with the communication module is connected with the intelligent terminal, the attenuation condition of the standby battery can be checked by software matched with the intelligent terminal, geographical position information and inspection date can be written into a memory of the control module, management is convenient, detection data comparison can be carried out through the line fault indicating device arranged on the same wind power plant power transmission line, and the accuracy of the inspection fault indicating device for measuring the current of the wind power plant power transmission line is checked.
The embodiments described above are only preferred embodiments of the invention and are not exhaustive of the possible implementations of the invention. Any obvious modifications to the above would be obvious to those of ordinary skill in the art, but would not bring the invention so modified beyond the spirit and scope of the present invention.
Claims (5)
1. An overhead line fault indication device comprising: power module, the module of charging, control module and line fault indication module, its characterized in that still includes: the charging current detection module and the circuit fault indication module;
the power supply module is used for acquiring electric energy from the power transmission line and supplying power to other power utilization modules; the charging module comprises a standby battery and a charging circuit, and the standby battery is electrically connected with the charging circuit; the line fault indication module is used for outputting an indication signal carrying the transmission line fault information provided by the control module; the charging current detection module is used for feeding back charging and discharging current data of the charging module to the control module, and the circuit fault indication module is used for outputting a charging module fault signal provided by the controller;
the charging current detection module, the circuit fault indication module and the line fault indication module are respectively electrically connected with the control module.
2. The overhead line fault indication device of claim 1, further comprising a communication module configured to transmit charging module attenuation data and transmission line detection data to an external smart terminal, the transmission line detection data including maximum and minimum currents of the transmission line over a period of time; the communication module is in communication connection with the control module.
3. The overhead line fault indication device of claim 2 wherein the control module is provided with a memory for storing installation geographical location information and inspection date.
4. The overhead line fault indication device of claim 3, wherein the line fault indication module and the circuit fault indication module are both circuits provided with LED indicator lights.
5. The overhead line fault indication device of claim 4, wherein the backup battery is a lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010480578.7A CN111665416A (en) | 2020-05-30 | 2020-05-30 | Overhead line fault indicating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010480578.7A CN111665416A (en) | 2020-05-30 | 2020-05-30 | Overhead line fault indicating device |
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| CN111665416A true CN111665416A (en) | 2020-09-15 |
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| CN202010480578.7A Pending CN111665416A (en) | 2020-05-30 | 2020-05-30 | Overhead line fault indicating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331937A (en) * | 2020-11-11 | 2021-02-05 | 河北零点新能源科技有限公司 | Novel lithium battery safety management system |
| CN116988946A (en) * | 2023-09-26 | 2023-11-03 | 温州电力建设有限公司 | Wind power system fault discrimination method based on active detection signal injection |
-
2020
- 2020-05-30 CN CN202010480578.7A patent/CN111665416A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331937A (en) * | 2020-11-11 | 2021-02-05 | 河北零点新能源科技有限公司 | Novel lithium battery safety management system |
| CN112331937B (en) * | 2020-11-11 | 2023-12-22 | 河北零点新能源科技有限公司 | Novel lithium battery safety management system |
| CN116988946A (en) * | 2023-09-26 | 2023-11-03 | 温州电力建设有限公司 | Wind power system fault discrimination method based on active detection signal injection |
| CN116988946B (en) * | 2023-09-26 | 2023-12-12 | 温州电力建设有限公司 | Wind power system fault discrimination method based on active detection signal injection |
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