CN209784474U - Overhead type integrated fault indicator for three-phase power transmission line - Google Patents
Overhead type integrated fault indicator for three-phase power transmission line Download PDFInfo
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- CN209784474U CN209784474U CN201920037226.7U CN201920037226U CN209784474U CN 209784474 U CN209784474 U CN 209784474U CN 201920037226 U CN201920037226 U CN 201920037226U CN 209784474 U CN209784474 U CN 209784474U
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Abstract
The utility model discloses an overhead type integrated fault indicator of a three-phase power transmission line, which comprises a first fault acquisition unit and a second fault acquisition unit; the first fault acquisition units comprise a first acquisition module, a first radio frequency module and first processing modules connected with the first acquisition module and the first radio frequency module respectively, and the two first fault acquisition units are arranged on any two power transmission lines in the three-phase power transmission lines respectively; the second fault acquisition unit comprises a second acquisition module, a second radio frequency module, a remote communication module and second processing modules which are respectively connected with the second acquisition module, the second fault acquisition unit is arranged on the rest one of the three-phase power transmission lines, the first radio frequency module is interconnected with the second radio frequency module, and the remote communication module is used for enabling the second processing module to be in wireless communication connection with an external monitoring center; the part integral type integration that this design will gather data is in second trouble acquisition unit, and the structure is simpler, construction convenience, simultaneously greatly reduced the cost.
Description
Technical Field
the utility model relates to a power grid management field, especially a fault indicator on three-phase transmission line.
Background
in recent years, the electric power industry in China is rapidly developed, and with the increase of population base, the demand of power supply quantity and electric quantity is increased day by day, and electric power lines and power grids are also more and more dense. The power distribution network is directly connected with users, is an important component in a power system, and the power supply quality of the power distribution network is directly related to the use condition and the economic benefit of the users.
In urban and rural distribution network systems in China, most overhead lines are adopted for power transmission, so that the influence of severe environmental and weather conditions, external damage, equipment faults, thunder and lightning and other natural disasters is great; on the other hand, due to the characteristics of long transmission distance, complex and various wiring modes, wide coverage range and the like, single-phase grounding or interphase short circuit faults are easy to occur under the influence of natural disasters and external damage; under the general condition, because the fault point can not be determined in time when the circuit breaks down, the circuit maintenance rate is very low and the large-area power failure phenomenon is easily caused, and the inspection of power workers is difficult.
At present, a method for detecting a power failure point mainly includes installing a failure indicator on an overhead line to complete acquisition, analysis and judgment of failure data and remotely transmit a power distribution network master station. The fault indicator typically includes three acquisition units with A, B, C phase sequence flags and an aggregation unit. The acquisition units are respectively installed on the three-phase transmission line in a one-to-one correspondence mode, so that short circuit earth faults are quickly identified, the collecting unit collects the short circuit earth fault information of the three-phase acquisition units in a short-distance wireless communication mode, and the fault information is sent to a power distribution main station in a long-distance communication mode.
However, although the fault indicator can identify short circuit and ground fault information on a line and send the information to a power distribution main station, the fault indicator is complex in networking mode, multiple in parts, inconvenient to install and construct, high in cost and not beneficial to later-stage operation and maintenance.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a simple structure, construction and installation convenience, the lower integral type fault indicator of cost.
The utility model adopts the technical proposal that:
overhead type integral type fault indicator of three-phase transmission line includes:
The first fault acquisition units comprise a first acquisition module for detecting the operation information of the power transmission line, a first radio frequency module and a first processing module respectively connected with the first acquisition module and the first radio frequency module, and the two first fault acquisition units are respectively arranged on any two power transmission lines in the three-phase power transmission line;
the second fault acquisition unit comprises a second acquisition module, a second radio frequency module, a remote communication module and a second processing module, wherein the second acquisition module is used for detecting the operation information of the power transmission line, the second processing module is respectively connected with the second acquisition module, the second radio frequency module and the remote communication module, the second fault acquisition unit is arranged on the rest power transmission line in the three-phase power transmission line, the first radio frequency module is interconnected with the second radio frequency module, and the remote communication module is used for enabling the second processing module to be in wireless communication connection with an external monitoring center.
The first fault acquisition unit further comprises a first alarm module, and the first processing module is electrically connected with the first alarm module to send out an alarm signal when the transmission line has an operation fault.
The first alarm module comprises a turning display component and/or a prompting lamp component.
The second fault acquisition unit further comprises a second alarm module, and the second processing module is electrically connected with the second alarm module to send out an alarm signal when the power transmission line has a fault in operation.
the first fault acquisition unit further comprises a first induction electricity taking part which can induce the current of the power transmission line and generate electric energy, and the first induction electricity taking part supplies power to the first fault acquisition unit.
The first fault acquisition unit further comprises a first standby power supply, a first switch component and a second switch component, a series branch formed by the first induction power taking component and the first switch component is connected in parallel with a series branch formed by the first standby power supply and the second switch component, and a trunk circuit after the parallel connection is connected with the first fault acquisition unit for power supply.
The second fault acquisition unit further comprises a power supply module, a super capacitor, a third switch component and a fourth switch component, wherein the power supply module is connected with the super capacitor through the third switch component, and the super capacitor is connected with the remote communication module through the fourth switch component.
The three-phase power transmission line comprises an A-phase line, a B-phase line and a C-phase line, wherein the B-phase line is positioned between the A-phase line and the C-phase line, the first fault acquisition units are respectively arranged on the A-phase line and the C-phase line, and the second fault acquisition units are arranged on the B-phase line.
The first fault acquisition unit further comprises a first parameter reading and writing module, the monitoring center can transmit set parameters for judging the operation fault of the power transmission line to the first fault acquisition unit through the second fault acquisition unit, and the first processing module is connected with the first parameter reading and writing module to read or rewrite the set parameters.
The second fault acquisition unit further comprises a second parameter reading and writing module, the monitoring center can transmit set parameters for judging the operation faults of the power transmission line to the second fault acquisition unit through the remote communication module, and the second processing module is connected with the second parameter reading and writing module to read or rewrite the set parameters.
The utility model has the advantages that:
the utility model discloses a fault indicator, first trouble acquisition unit have two, and set up respectively on arbitrary two transmission lines in three-phase transmission line, and second trouble acquisition unit sets up on remaining one transmission line, first trouble acquisition unit and second trouble acquisition unit can collect the running information of this transmission line correspondingly, and judge whether have the running fault, and two first trouble acquisition units transmit the running information through radio frequency module of short-range communication, gather the information on second trouble acquisition unit and then send signal one to the control center through the remote communication module, simultaneously, the data that the control center sent also can arrive second trouble acquisition unit earlier, distribute by second trouble acquisition unit again, this design is integrated the part integration that collects data in second trouble acquisition unit, the structure is simpler, during construction, only the first fault acquisition unit and the second fault acquisition unit are required to be respectively installed on the three-phase transmission line, so that the method is very convenient, and meanwhile, the cost is greatly reduced.
In the aspect of power supply, the first induction power taking component induces the current of the power transmission line to generate electric energy to supply power for the fault acquisition unit, and further, a standby power supply can be adopted to supply power in parallel, and the first induction power taking component and the standby power supply are combined to guarantee continuous power supply for the fault acquisition unit.
And in the second fault acquisition unit, a super capacitor is added, and the power supply module supplies power for the remote communication module after converting electric energy through the super capacitor, so that the second fault acquisition unit has the advantages of high charging and discharging efficiency, long service life and the like.
Drawings
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic view of a first fault detection unit.
Fig. 2 is a schematic view of a second fault detection unit.
Fig. 3 is a schematic diagram of an application state of the fault indicator of the present invention.
Fig. 4 is a short circuit current signature.
fig. 5 is a ground current signature.
Fig. 6 is a ground voltage signature diagram.
fig. 7 is an equivalent circuit diagram of power supply in the second fault collection unit.
Detailed Description
As shown in fig. 1-3, the utility model discloses fault indicator includes:
The first fault acquisition unit 1 comprises a first acquisition module 11 for detecting the operation information of the power transmission line, a first radio frequency module 12 and a first processing module 13 respectively connected with the first acquisition module 11 and the first radio frequency module 12, wherein the first fault acquisition unit 1 comprises two fault acquisition units which are respectively arranged on any two power transmission lines in the three-phase power transmission line;
The second fault acquisition unit 2 comprises a second acquisition module 21, a second radio frequency module 22 and a remote communication module 23 which are used for detecting the operation information of the power transmission line, and a second processing module 24 which is respectively connected with the second acquisition module 21, the second radio frequency module 22 and the remote communication module 23, the second fault acquisition unit 2 is arranged on the rest power transmission line in the three-phase power transmission line, the first radio frequency module 12 is connected with the second radio frequency module 22 in an interconnected mode, and the remote communication module 23 is used for enabling the second processing module 24 to be in wireless communication connection with an external monitoring center.
The first acquisition module 11 and the second acquisition module 21 may be current or voltage transformers arranged on the power transmission line, and can sample and filter load current signals and field intensity signals to the ground;
The first processing module 13 and the second processing module 24 may both be composed of an MCU or a CPU and peripheral circuits thereof, and further may adopt an STM32L433 series single chip microcomputer, the STM32L433 is used as a core processor, 32-bit arithmetic processing is performed, a main frequency may reach 168M, operation control of ultra-low power consumption is performed, performance is superior, and logic operation and low power consumption operation of complex data of the system are supported, wherein a fault logic determination module may be integrated or externally provided, and according to an instantaneous change state of voltage and current on the line when the line fails, a transient characteristic method is used to analyze the acquired data and determine whether the fault type of the line is a short-circuit fault or a ground fault;
The monitoring principle of the fault is as follows:
1) And (3) interphase short circuit fault: when a short circuit occurs in a line, according to a short circuit phenomenon, the current characteristics of the line at the moment of the short circuit are mainly represented as instantaneous sudden change of current amount to cause power failure of a relay protection operation, and the current characteristic waveforms can be described as shown in fig. 4, I1 is the current value in normal operation, I2 is the current value in short circuit fault, Δ I is fault sudden change current, t1 is the normal operation time, t1 to t2 are the duration of short circuit fault current, and the currents I1, I2 and the times t1, t2 thereof generally have the following conditions under the transient characteristics of an interphase short circuit:
I2-I1>150A；
t2-t1>＝20ms；
t2-t1<＝100ms；
when the current characteristics monitored by the acquisition unit meet the following conditions, the short-circuit fault is judged:
Sudden change of line load current, wherein the current sudden change amount is more than or equal to 150A;
the relay protection is rapidly operated due to the interphase short circuit, the duration time of the short circuit current before the operation is 20ms to 100ms, and once the relay protection is operated, the line fault indicator detects that the line is in a non-voltage and non-current power failure state.
The system mainly judges the short-circuit fault by monitoring the current characteristics of the waveform.
2) single-phase ground short-circuit fault: the transient characteristic process is relatively complex relative to the interphase short-circuit fault and mainly shows simultaneous sudden change of voltage and current, as shown in fig. 5 and 6, I1 and U1 are current and voltage values in normal operation, I2 and U2 are current and voltage values of a line in single-phase grounding, Δ I is a current sudden change increment, Δ U is a voltage sudden change increment, t1 is normal operation time, t1 to t2 are the duration time of the grounding short-circuit fault current, and according to the transient characteristic process of the grounding short-circuit fault, I1, I2, U1, U2, t1 and t2 meet the following conditions:
I2-I1>15A；
U1-U2>＝30％U1；
t2-t1>＝100ms；
The single-phase ground short circuit feature includes:
sudden change of line load current, wherein the sudden change of the grounding short-circuit current is more than or equal to 15A;
Single-phase voltage sudden change, namely sudden voltage drop to the ground voltage, wherein the sudden change amount is at least more than or equal to 30% of the voltage before sudden change;
t1-t2, namely, the single-phase grounding time is more than 100ms, and the single-phase grounding operation time of the power line without the small-current grounding line selection system is longer.
The system mainly judges the ground fault by monitoring the sudden change characteristics of the voltage and the current.
The first rf module 12 and the second rf module 22 may be 2.4G rf modules, 433M-437M rf modules, etc., and support SX1212 wireless driver writing and add corresponding communication frequency configurations.
And the remote communication module 23 can adopt a GPRS module to realize remote signal transmission.
Further, as the radio frequency module has a certain communication distance, and the longer the distance is, the consumed power can be increased, in order to save electric energy to the maximum, the three-phase transmission line comprises an a-phase line, a B-phase line and a C-phase line, the B-phase line is positioned between the a-phase line and the C-phase line, the first fault acquisition units 1 are respectively arranged on the a-phase line and the C-phase line, and the second fault acquisition units 2 are arranged on the B-phase line, so that the second fault acquisition units 2 are positioned in the middle, and data of the two first fault acquisition units can be collected at the shortest distance.
This design will collect the part integral type integration of data in second trouble acquisition unit 2, and the structure is simpler, only needs to install first trouble acquisition unit 1 respectively during the construction and second trouble acquisition unit 2 on the three-phase transmission line, and is very convenient, simultaneously greatly reduced the cost.
The first fault acquisition unit 1 further comprises a first alarm module 14, and the first processing module 13 is electrically connected with the first alarm module 14 to send out an alarm signal when the transmission line has an operation fault.
The second fault acquisition unit 2 further comprises a second alarm module 25, and the second processing module 24 is electrically connected with the second alarm module 25 to send out an alarm signal when the transmission line has an operation fault.
The first alarm module 14 and the second alarm module 25 can both comprise a turning display component and/or a prompting lamp component, when a circuit fails, flashing and turning display is carried out through the first alarm module or the second alarm module, the first fault acquisition unit or the second fault acquisition unit is provided with the alarm module, and when a worker overhauls the circuit, the problem of the power transmission line can be rapidly identified, so that the circuit is convenient to overhaul rapidly.
The turnover display component can be composed of a sign and a turnover mechanism, the first processing module or the second processing module is connected with the turnover mechanism, and when a fault occurs, the turnover mechanism is controlled to operate, the sign is turned over and displayed, so that a warning effect is achieved.
further, the first fault collection unit 1 further includes a first parameter read-write module 15, the monitoring center can transmit the setting parameter for judging the operation fault of the power transmission line to the first fault collection unit 1 through the second fault collection unit 2, and the first processing module 13 is connected with the first parameter read-write module 15 to read or rewrite the setting parameter.
The second fault collection unit 2 further includes a second parameter read-write module 26, the monitoring center can transmit a setting parameter for judging the operation fault of the power transmission line to the second fault collection unit 2 through the remote communication module 23, and the second processing module 24 is connected with the second parameter read-write module 26 to read or rewrite the setting parameter.
The first parameter read-write module 15 and the second parameter read-write module 26 can be one or more of a flash memory, a ram memory and a rom memory, have check and communication protocols in the interior in a self-defined mode, and can perform remote online read-write on set parameters such as short circuit, grounding, low voltage, communication, node information, calibration tables and the like through the wireless communication mode.
In addition, the design is also improved correspondingly in the aspect of power supply, the first fault acquisition unit 1 further includes a first induction power-taking component 16 capable of inducing the current of the power transmission line and generating electric energy, the first induction power-taking component 16 supplies power to the first fault acquisition unit 1, the first induction power-taking component 16 may be a CT rogowski coil, and further, the CT rogowski coil may also be used as the first acquisition module 11 to sample the load current signal and the ground field intensity signal.
The first fault acquisition unit 1 further comprises a first standby power supply 17, a first switch component 18 and a second switch component 19, a series branch formed by the first induction electricity taking component 16 and the first switch component 18 is connected in parallel with a series branch formed by the first standby power supply 17 and the second switch component 19, and a main circuit after the parallel connection is connected with the first fault acquisition unit 1 for power supply.
The first switch component and the second switch component can be controlled by the first processing module, and can also be directly driven to be switched on and off through a circuit according to the amount of electric energy induced by the CT Rogowski coil; under the condition that the current of the power transmission line is large, a first induction power taking part mainly or simply provides power, a first standby power supply is used as an auxiliary power supply or the first standby power supply is disconnected for supplying power, and under the condition that the current of the power transmission line is small, the first induction power taking part mainly or simply provides power, and the first induction power taking part is used as the auxiliary power supply or the first induction power taking part is disconnected for supplying power.
as shown in fig. 7, the second failure detection unit 2 further includes a power supply module 27, a super capacitor 28, a third switch component 29, and a fourth switch component 210, the power supply module 27 is connected to the super capacitor 28 through the third switch component 29, the super capacitor 28 is connected to the remote communication module 23 through the fourth switch component 210, the power supply module 27 can directly supply power to other modules of the second failure detection unit 2, where the third switch component 29 and the fourth switch component 210 can be controlled by the second processing module 24, and the on-off is controlled according to the operation condition of the remote communication module 23.
The power supply module 27 may be similar to the power supply component in the first fault collecting unit, and includes a second induction power-taking component 271, and similarly, the second induction power-taking component may be a CT rogowski coil, and may also be used as a second collecting module to sample the load current signal and the ground field strength signal.
The power supply module 27 further includes a second standby power 272, a fifth switch part 273 and a sixth switch part 274, a serial branch formed by the second induction power taking part 271 and the fifth switch part 273 is connected in parallel with a serial branch formed by the second standby power 272 and the sixth switch part 274, and a main circuit after parallel connection is connected with the third switch part 29 to charge the super capacitor.
The GPRS remote communication module sends a heartbeat short frame to the second fault acquisition unit every minute, and the second fault acquisition unit needs to reply the short frame; the master station sends a summon (data communication) to the second fault acquisition unit every 10 minutes, the second fault acquisition unit reports the monitoring data uploaded by the two first fault acquisition units and the local data to the master station through the remote communication module, and once the remote communication module is in a data communication state, the system power consumption is multiplied. Therefore, it is necessary to improve the output power of the power supply by using the discharge characteristic of the super capacitor during data communication of the remote communication module, and to provide the super capacitor with energy storage for charging when data communication of the remote communication module is not performed.
As shown in fig. 7, RC and Rf are resistors, C is a super capacitor, and I1 and I2 are charging and discharging currents of the super capacitor, respectively;
The charging process of the super capacitor C is as follows: when the remote communication module is in a non-data communication state, the third switch component S3 is switched on to charge the super capacitor C, when the super capacitor C is insufficient in electric energy, the second induction electricity taking component is sufficient in electric energy, the fifth switch component S2 is switched on, and the sixth switch component S1 is switched off, so that the second induction electricity taking component can charge the super capacitor and supply power to the remote communication module, and the battery consumption is saved; when the electric quantity of the second induction electricity taking part is insufficient, the fifth switch part S2 is disconnected, the sixth switch part S1 is closed, and a second standby power supply is used for charging the super capacitor C and supplying power to the remote communication module; because the super capacitor has good charging and discharging performance and high energy conversion efficiency and can be charged quickly, the charging time is usually dozens of seconds.
The discharging process of the super capacitor C is as follows: when the super capacitor C is sufficiently powered and the telecommunication module is in a data communication state, the sixth switching element S1 and the fifth switching element S2 are opened, the fourth switching element S4 is closed, the super capacitor C is turned on to supply power to the telecommunication module, and I2 discharges current for the super capacitor.
In the aspect of power supply, the first induction power taking component induces the current of the power transmission line to generate electric energy to supply power for the fault acquisition unit, and further, a standby power supply can be adopted to supply power in parallel, and the first induction power taking component and the standby power supply are combined to guarantee continuous power supply for the fault acquisition unit.
And in the second fault acquisition unit, a super capacitor is added, the power supply module supplies power for the remote communication module after converting electric energy through the super capacitor, and the super capacitor has the advantages of higher capacity of storing charges than a common capacitor, high charging and discharging efficiency, no pollution to the environment, no maintenance, long service life, high safety and the like.
the above is only the preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and the technical solution of the present invention is all within the protection scope of the present invention as long as the present invention is realized by the substantially same means.
Claims (10)
1. overhead type integral type fault indicator of three-phase transmission line, its characterized in that includes:
The first fault acquisition units comprise a first acquisition module for detecting the operation information of the power transmission line, a first radio frequency module and a first processing module respectively connected with the first acquisition module and the first radio frequency module, and the two first fault acquisition units are respectively arranged on any two power transmission lines in the three-phase power transmission line;
The second fault acquisition unit comprises a second acquisition module, a second radio frequency module, a remote communication module and a second processing module, wherein the second acquisition module is used for detecting the operation information of the power transmission line, the second processing module is respectively connected with the second acquisition module, the second radio frequency module and the remote communication module, the second fault acquisition unit is arranged on the rest power transmission line in the three-phase power transmission line, the first radio frequency module is interconnected with the second radio frequency module, and the remote communication module is used for enabling the second processing module to be in wireless communication connection with an external monitoring center.
2. the overhead type integrated fault indicator of the three-phase power transmission line according to claim 1, characterized in that: the first fault acquisition unit further comprises a first alarm module, and the first processing module is electrically connected with the first alarm module to send out an alarm signal when the transmission line has an operation fault.
3. The overhead integral fault indicator of the three-phase power transmission line of claim 2, wherein: the first alarm module comprises a turning display component and/or a prompting lamp component.
4. The overhead type integrated fault indicator of the three-phase power transmission line according to claim 1, characterized in that: the second fault acquisition unit further comprises a second alarm module, and the second processing module is electrically connected with the second alarm module to send out an alarm signal when the power transmission line has a fault in operation.
5. the overhead type integrated fault indicator of the three-phase power transmission line according to claim 1, characterized in that: the first fault acquisition unit further comprises a first induction electricity taking part which can induce the current of the power transmission line and generate electric energy, and the first induction electricity taking part supplies power to the first fault acquisition unit.
6. The overhead integral fault indicator of the three-phase power transmission line of claim 5, wherein: the first fault acquisition unit further comprises a first standby power supply, a first switch component and a second switch component, a series branch formed by the first induction power taking component and the first switch component is connected in parallel with a series branch formed by the first standby power supply and the second switch component, and a trunk circuit after the parallel connection is connected with the first fault acquisition unit for power supply.
7. The overhead type integrated fault indicator of the three-phase power transmission line according to claim 1, characterized in that: the second fault acquisition unit further comprises a power supply module, a super capacitor, a third switch component and a fourth switch component, wherein the power supply module is connected with the super capacitor through the third switch component, and the super capacitor is connected with the remote communication module through the fourth switch component.
8. The overhead type integrated fault indicator of the three-phase power transmission line according to claim 1, characterized in that: the three-phase power transmission line comprises an A-phase line, a B-phase line and a C-phase line, wherein the B-phase line is positioned between the A-phase line and the C-phase line, the first fault acquisition units are respectively arranged on the A-phase line and the C-phase line, and the second fault acquisition units are arranged on the B-phase line.
9. The overhead type integrated fault indicator of the three-phase power transmission line according to claim 1, characterized in that: the first fault acquisition unit further comprises a first parameter reading and writing module, the monitoring center can transmit set parameters for judging the operation fault of the power transmission line to the first fault acquisition unit through the second fault acquisition unit, and the first processing module is connected with the first parameter reading and writing module to read or rewrite the set parameters.
10. the overhead integral fault indicator of the three-phase power transmission line of claim 9, wherein: the second fault acquisition unit further comprises a second parameter reading and writing module, the monitoring center can transmit set parameters for judging the operation faults of the power transmission line to the second fault acquisition unit through the remote communication module, and the second processing module is connected with the second parameter reading and writing module to read or rewrite the set parameters.
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| CN114441828A (en) * | 2021-12-24 | 2022-05-06 | 天津三源电力智能科技有限公司 | Overhead type low current acquisition and fault alarm device |
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| CN114441828A (en) * | 2021-12-24 | 2022-05-06 | 天津三源电力智能科技有限公司 | Overhead type low current acquisition and fault alarm device |
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