CN211180059U - Explosion-proof intelligent fault indicator - Google Patents
Explosion-proof intelligent fault indicator Download PDFInfo
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- CN211180059U CN211180059U CN201922172182.1U CN201922172182U CN211180059U CN 211180059 U CN211180059 U CN 211180059U CN 201922172182 U CN201922172182 U CN 201922172182U CN 211180059 U CN211180059 U CN 211180059U
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Abstract
The utility model discloses an explosion-proof intelligent fault indicator, which comprises a fault collector, a collecting unit and a main station; the fault collector comprises a current collecting module, a standby power supply, a power supply conversion module, a battery voltage sampling and control module, an electric field sampling module, a radio frequency module, a power supply control module, a programming interface, a protection module, a drive module, a low-power-consumption controller, an indicator lamp turning and resetting control module and a drive circuit; the collecting unit comprises a solar power supply and backup power supply module, a radio frequency communication module, a GPRS communication module, an encryption module, an external clock unit, a backup power supply activation control module and an external storage function module; the method can realize accurate judgment on interphase short circuit faults, ground faults, transient faults and permanent faults in the distribution line faults, accurately upload fault records to a distribution network main station to perform accurate positioning analysis on the faults, and upload current waveforms and ground field voltage waveforms to the main station before and after the occurrence time of the faults for fault analysis, inversion and source tracing.
Description
Technical Field
The utility model relates to a fault indicator technical field, concretely relates to fault indicator.
Background
The power supply line in China is mostly exposed to the outdoor environment with severe environment, and is influenced by various adverse factors and conditions all the year round, so that the line faults occur occasionally, and because the environment is complex, once some faults occur, the finding of the positions of the faults becomes very difficult. Therefore, after the line has a fault, the fault section is timely and effectively cut off and isolated, normal power supply of other non-fault sections is guaranteed, the fault position is quickly and accurately determined, repair and maintenance are timely carried out, and the power supply is guaranteed to be recovered at the highest speed.
However, compared with power transmission, related research on power distribution fault detection and diagnosis is less, supporting facilities are not complete enough, and power supply reliability and power supply quality of a power distribution network cannot meet urgent needs of economic development of the current social region. Correspondingly, the power distribution network is a power supply network directly facing the electricity consumers and is inseparably and closely related to the daily life of people. In addition, since users are directly faced, the development of power distribution networks directly affects the economic development of the region. Once the distribution network fails, huge loss can be caused to regional economy, and great inconvenience is brought to daily work and life of people.
With the deep development of the intelligent power grid engineering project of the national power grid company, the automation degree of the power distribution network is to be improved urgently. To realize the automation of the power distribution network, the real-time acquisition of the power grid information data and the automatic processing of the fault information are functions which must be realized firstly. Generally, faults of distribution lines can be roughly classified into transient faults and permanent faults: the transient fault is the condition that the reclosing can stably operate after the line has a fault; the permanent fault is the condition that even if the reclosing fault still exists after the line has a fault, the reclosing fails and the stable operation cannot be recovered. Statistics show that the ratio of instantaneous to permanent in a power distribution network fault is about 9: 1. However, the insulation cannot be automatically reset due to the line tripping after a permanent fault occurs. And if the circuit is forcibly reclosed, the circuit can be thrown to a permanent fault point, so that the accident is further expanded, and even serious safety accidents can be caused under serious conditions. Therefore, the accident position is quickly and accurately positioned, the running condition of the power distribution network is effectively improved, and the power supply reliability is greatly improved.
Aiming at the fault characteristics of the distribution lines, the intelligent power grid and the development requirements of the automation of the power distribution grid are combined, and the scheme researches a power distribution grid 35kV (35 kV and below) overhead line monitoring and management system based on an intelligent fault indicator.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a fault indicator can realize the quick location to distribution network overhead line's on-line monitoring and trouble, can gather the real-time data of electric wire netting operation and upload through wireless transmission terminal, can realize differentiating the fault point position indication of fault type through intelligent fault indicator's L ED pilot lamp, can realize long-range information acquisition and parameter setting through software auxiliary system.
The utility model provides a technical scheme:
an explosion-proof intelligent fault indicator comprises a fault collector, a collecting unit and a main station; the fault collector comprises a current collecting module, a standby power supply, a power supply conversion module, a battery voltage sampling and control module, an electric field sampling module, a radio frequency module, a power supply control module, a programming interface, a protection module, a drive module, a low-power-consumption controller, an indicator lamp turning and resetting control module and a drive circuit; the collecting unit comprises a solar power supply and backup power supply module, a radio frequency communication module, a GPRS communication module, an encryption module, an external clock unit, a backup power supply activation control module and an external storage function module; the method can realize accurate judgment on interphase short circuit faults, ground faults, transient faults and permanent faults in the distribution line faults, accurately upload fault records to a distribution network main station to perform accurate positioning analysis on the faults, and upload current waveforms and ground field voltage waveforms to the main station before and after the occurrence time of the faults for fault analysis, inversion and source tracing.
Further, the current collector that the current collection module adopted is closed magnetic circuit, and the current collection is through hanging the current collector on the overhead cable collection overhead cable on the electric current, then samples and gets the electricity through current conditioning circuit to the current signal, and carry out corresponding protection and amplitude limiting to it, and the current signal gets into main control chip through AD interface sampling, calculates the judgement as the current value of current circuit, and another way carries out the level through electric capacity steady voltage and power chip and converts into control chip, communication chip and each analog circuit and provide 5V and 3.3V power supply.
Furthermore, the indicator light turnover plate adopts a high-brightness L ED light-emitting diode which is distributed on the bottom plate of the collector at an angle of 120 degrees, so that fault indication and alarm can be seen by the indicator light and the turnover plate within a range of 360 degrees when a circuit fails.
Furthermore, the standby power supply activation control module accurately detects and judges faults through overcurrent sudden change and electric field voltage in combination with the actual power grid secondary relay protection system detection line power failure and reclosing process, and collects current waveforms and ground electric field data in real time.
Further, the solar power supply and backup power supply module comprises a solar panel and a storage battery, wherein the solar panel is used as a main power supply, and the storage battery is used as a backup power supply.
Further, the radio frequency module adopts L ORA wireless communication chip.
The utility model discloses beneficial effect:
(1) the current collection unit of the fault indicator adopts the integrated design of electricity taking and current sampling, adopts the same current collection module, and not only can reduce the volume of equipment, but also can reduce the cost.
(2) The traditional line voltage is collected or is not collected or is collected by a mutual inductor, so that the cost is greatly increased, the construction difficulty is increased, the accuracy is reduced when the fault is judged possibly by not sampling the voltage, the misoperation and the failure rate of the equipment are increased, and the accuracy of a fault indicator is reduced.
(3) The parameters of the product can be set or adjusted on line, while the parameters of the traditional equipment can not be adjusted on line.
(4) The traditional fault indication system only realizes the function of one remote, but the product can realize the function of four remote, and can carry out remote reset control and the like when equipment is in misoperation.
(5) The collecting unit can not only carry out far and near distance transmission, but also comprehensively judge three phases by receiving sampling signals of the collector, so that the accuracy of the equipment is improved, and the traditional collecting unit only has an information transmission function.
Drawings
FIG. 1 is a block diagram of a fault collector unit of the present invention;
fig. 2 is a block diagram of a collecting unit of the fault indicator of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to perform more detailed description on the technical solution in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, a fault indicator is used for detecting a circuit. The system comprises a fault collector, a collecting unit and a main station. The fault collector comprises a current sampling and power taking device, a standby power supply, a power supply conversion module, a battery voltage sampling and control module 100, an electric field sampling module, a radio frequency module 200, a power supply control, programming interface, protection, driving, a low-power-consumption controller, a card turning 300, a reset control module, a driving circuit and the like. The collecting unit comprises a solar power supply and backup power supply module, a radio frequency communication module, a GPRS communication module, an encryption module, an external clock unit, a standby power supply activation control module and an external storage function module.
The current collector adopted by the electric field sampling module is a closed magnetic circuit so as to improve the sensitivity of current detection and simultaneously has the function of automatically taking electricity from a wire current magnetic field. Current acquisition gathers the electric current on the overhead cable through hanging the current collector on the overhead cable, then sample and get the electricity to the current signal through current conditioning circuit, and carry out corresponding protection and amplitude limiting to it, the current signal gets into main control chip through AD sampling, calculate the judgement as the current value of current circuit, and another way carries out level conversion through electric capacity steady voltage and power chip and provides 5V and 3.3V power supply, accessible spare lithium cell (3.6V) supplies power for chip and circuit when circuit electric current is less.
The voltage acquisition module adopts an electric field sensor, the work of the voltage acquisition module mainly utilizes the electrostatic induction principle, the main part of the sensor consists of an upper conductive shell and a lower conductive shell, the two shells are connected through an induction capacitor, when no electric field exists outside the sensor, the positive and negative charges of the sensor are balanced and are electrically neutral, when an electric field E is applied, under the action of the electric field, the positive and negative charges of the sensor are redistributed, the negative charges move upwards, the positive charges move downwards, and the two ends of the capacitor CSENSE generate induced voltage USENSE. We can change through collecting the electric current through electric field sensor to supplementary adoption electric field voltage comes more accurate judgement ground fault, and the wire is hugged closely to the line ball board (electric field sensor) of overhead type indicator, with the sensitivity that improves electric field detection, and electric field line is drawn forth to cable type indicator, hugs closely cable head department, with the sensitivity that improves electric field detection.
The electric field collected voltage is input into the fault collector, then enters the AD sampling port through the amplitude limiting and voltage conditioning circuit, provides a voltage reference value for the controller, and is matched with a current signal to be applied to fault judgment.
The power module adopts the current collector to get electricity by itself and the backup lithium sub-battery supplies power, the collector gets electricity through the induction coil on the overhead cable under normal conditions [5A (minimum get electricity current) can satisfy the collector get electricity requirement ], the electricity that the normal condition was got is adopted as the main power source, detect simultaneously and get the electricity voltage and backup power supply voltage and pass through real-time detection dynamic switching power supply mode, reduce and use backup power supply and improve the battery live time.
The collector adopts L ORA wireless communication chip, the collector and the collector exchange data bidirectionally through short distance radio frequency wireless chip, the data collected by the collector are reported actively and periodically (the periodic time can be set freely), the power switch of the radio frequency chip is controllable, and the radio frequency chip is turned on and off when needed, thereby reducing the power consumption of the collection system and ensuring that the fault indicator can complete the data transmission under the condition of ultra-low power consumption.
Indicator light and board turning, the indicator light adopts the high bright L ED emitting diode, becomes 120 distribution in collector bottom plate, guarantees that indicator light and tilting tray can both see trouble indication and warning in 360 degrees scopes when the circuit breaks down.
The wireless communication module comprises a near field wireless communication and GPRS mixed networking mode, the concentrator and the collector perform data communication time synchronization through near field wireless communication and the like, the concentrator comprehensively records the number of the collectors, data are reported to the master station through a GPRS network periodically, and when a fault occurs, the concentrator uploads current waveforms and electric field voltage waveforms before and after the moment of the fault point to the master station through the GPRS. GPRS and near field wireless communication set up switch, and work provides the guarantee for long-time work in order to reduce the power consumption intermittently.
The accuracy of the fault collector depends on the sampling of voltage and current, so the current collector adopted by the design is a closed magnetic circuit to improve the sensitivity of current detection, and the fault collector has the function of automatically taking electricity from a current magnetic field of a lead. Current acquisition gathers the electric current on the overhead cable through hanging the current collector on the overhead cable, then sample and get the electricity to the current signal through current conditioning circuit, and carry out corresponding protection and amplitude limiting to it, the current signal gets into main control chip through AD sampling, calculate the judgement as the current value of current circuit, and another way carries out level conversion through electric capacity steady voltage and power chip and provides 5V and 3.3V power supply, accessible spare lithium cell (3.6V) supplies power for chip and circuit when circuit electric current is less.
The voltage acquisition adopts an electric field sensor, the work of the electric field sensor mainly utilizes the electrostatic induction principle, the main part of the sensor consists of an upper conductive shell and a lower conductive shell, the two shells are connected through an induction capacitor, when no electric field exists outside the sensor, the positive and negative charges of the sensor are balanced and are electrically neutral, when an electric field E is applied, under the action of the electric field, the positive and negative charges of the sensor are redistributed, the negative charges move upwards, the positive charges move downwards, and the two ends of the capacitor CSENSE generate the induced voltage USENSE. We can change through collecting the electric current through electric field sensor to supplementary adoption electric field voltage comes more accurate judgement ground fault, and the wire is hugged closely to the line ball board (electric field sensor) of overhead type indicator, with the sensitivity that improves electric field detection, and electric field line is drawn forth to cable type indicator, hugs closely cable head department, with the sensitivity that improves electric field detection.
The power supply module adopts the current collector to automatically obtain power and supplies power to a backup lithium subcell, the collector obtains power through an induction coil on an overhead cable under normal conditions [5A (minimum power current) can meet the power-obtaining requirement of the collector ], the obtained power is used as a main power supply under normal conditions, the power-obtaining voltage and the backup power supply voltage are detected to dynamically switch the power supply mode through real-time detection, the battery service time is improved by using a backup power supply, the collector adopts an L ORA wireless communication chip, the collector and the collector perform bidirectional data exchange through a short-distance radio frequency wireless chip, the data collected by the collector is actively and periodically reported (the periodic time can be freely set), a power switch of the radio frequency chip is controllable, the power consumption of the collection system is reduced when the power switch is turned on and off when needed, the fault indicator can complete data transmission under the condition of ultralow power consumption, and the indicator light L ED light emitting diodes are distributed on a bottom plate at 120 degrees, and the fault indicator and the alarm indicator can be seen in a 360-degree alarm range of the collector when the on-line circuit fails.
The fault collector mainly judges two different fault types of short-circuit fault and ground fault, and firstly, the working principle of the short-circuit detection part of the indicator requires for the short-circuit fault: according to the characteristics of short circuit, the current sudden change (or the actual short circuit current magnitude) in the line, the fault duration and whether the line has power failure are measured by an electromagnetic induction method to judge the fault.
The detection module principle adopts a single-phase grounding algorithm based on first half-wave impact current, when a small grounding current system generates single-phase grounding, the method has two characteristics, one is that the grounding phase line is greatly reduced to the ground voltage, but the grounding phase line is not increased to the ground voltage, the grounding fault is mostly caused by breakdown of insulation in a power grid, and generally occurs at the moment when the phase voltage is close to the maximum value, at the moment, the transient capacitance current can be regarded as the sum of discharge capacitance current caused by sudden reduction of the fault phase voltage and charge capacitance current caused by sudden increase of the non-fault phase voltage, the transient component of the grounding capacitance current is much larger than the steady-state value of the grounding capacitance current, and whether the grounding fault occurs or not is judged according to the waveform of the first half-wave impact current. For a small current grounding system, a detection method of load current, first half-wave grounding current, line-to-ground voltage reduction proportion and time delay is adopted. Parameters such as grounding action current, voltage-to-ground voltage reduction proportion and duration are set before delivery. When the indicator has a failure or misoperation, the master station is used for controlling the fault indicator to realize online adjustment, so that the action accuracy of the indicator is ensured. For the small current resistance grounding system, a detection method of the magnitude of load current and quick-break overcurrent current, the duration time of fault current and whether a line is powered off can be adopted, and meanwhile, a grounding fault detection method of the small current grounding system is combined. Parameters such as quick break, overcurrent and the like are set before delivery. When the indicator has a failure or misoperation, the master station is used for controlling the fault indicator to realize online adjustment, so that the action accuracy of the indicator is ensured.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (6)
1. Explosion-proof type intelligence fault indicator, its characterized in that: the system comprises a fault collector, a collecting unit and a master station;
the fault collector comprises a current collecting module, a standby power supply, a power supply conversion module, a battery voltage sampling and control module, an electric field sampling module, a radio frequency module, a power supply control module, a programming interface, a protection module, a drive module, a low-power-consumption controller, an indicator lamp turning and resetting control module and a drive circuit;
the collecting unit comprises a solar power supply and backup power supply module, a radio frequency communication module, a GPRS communication module, an encryption module, an external clock unit, a backup power supply activation control module and an external storage function module;
the method can realize accurate judgment on interphase short circuit faults, ground faults, transient faults and permanent faults in the distribution line faults, accurately upload fault records to a distribution network main station to perform accurate positioning analysis on the faults, and upload current waveforms and ground field voltage waveforms to the main station before and after the occurrence time of the faults for fault analysis, inversion and source tracing.
2. The explosion-proof intelligent fault indicator of claim 1, wherein: the current collector that the current acquisition module adopted is closed magnetic circuit, the electric current is gathered and is gathered the electric current on the overhead cable through the current collector who hangs on the overhead cable, then sample and get the electricity through current conditioning circuit to it carries out corresponding protection and amplitude limiting, current signal gets into main control chip through AD interface sampling, calculate the judgement as the current value of current circuit, and another way carries out level conversion through electric capacity steady voltage and power chip and provides 5V and 3.3V power supply, communication chip and each analog circuit.
3. The explosion-proof intelligent fault indicator of claim 1, wherein the indicator light flips are high-brightness L ED Light Emitting Diodes (LEDs) distributed on the collector base plate at 120 degrees, so that fault indication and alarm can be seen within 360 degrees when the line fails.
4. The explosion-proof intelligent fault indicator of claim 1, wherein: the standby power supply activation control module accurately detects and judges faults through overcurrent sudden change and electric field voltage in combination with the actual power grid secondary relay protection system detection line power failure and reclosing process, and collects current waveforms and ground electric field data in real time.
5. The explosion-proof intelligent fault indicator of claim 1, wherein: the solar power supply and backup power supply module comprises a solar panel and a storage battery, wherein the solar panel is used as a main power supply, and the storage battery is used as a backup power supply.
6. The explosion-proof intelligent fault indicator of claim 1, wherein the radio frequency module is L ORA wireless communication chip.
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| CN2018220536015 | 2018-12-07 | ||
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406947A (en) * | 2018-12-07 | 2019-03-01 | 河南师范大学 | A kind of explosion-proof type intelligent trouble indicator |
| CN112924862A (en) * | 2021-01-28 | 2021-06-08 | 贵州电网有限责任公司 | Primary side fault injection FA detection system and method |
-
2019
- 2019-12-06 CN CN201922172182.1U patent/CN211180059U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406947A (en) * | 2018-12-07 | 2019-03-01 | 河南师范大学 | A kind of explosion-proof type intelligent trouble indicator |
| CN112924862A (en) * | 2021-01-28 | 2021-06-08 | 贵州电网有限责任公司 | Primary side fault injection FA detection system and method |
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