CN109194407B - Transformer substation perimeter laser fence position autonomous calibration system and method - Google Patents
Transformer substation perimeter laser fence position autonomous calibration system and method Download PDFInfo
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- CN109194407B CN109194407B CN201811172442.9A CN201811172442A CN109194407B CN 109194407 B CN109194407 B CN 109194407B CN 201811172442 A CN201811172442 A CN 201811172442A CN 109194407 B CN109194407 B CN 109194407B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
Abstract
The invention relates to a transformer substation perimeter laser fence position autonomous calibration system and a method, wherein the autonomous calibration system comprises a laser calibration device a, a laser calibration device b1, a laser calibration device b2, a three-dimensional cradle head, a cradle head control device and a double-faced reflector, the degree of deviation between a fence and a reference initial position is detected by using the double-faced reflector, the laser calibration device a, the laser calibration device b1 and the laser calibration device b2, the deviation degree is fed back to the cradle head control device to control the three-dimensional cradle head, and the three-dimensional cradle head drives a fence vertical rod placed on the three-dimensional cradle head to carry out position calibration in a horizontal position and a vertical position, so that autonomous alignment correction of the laser fence is realized. Compared with the prior art, the method has the advantages of realizing automatic calibration at regular intervals and reducing false alarms.
Description
Technical Field
The invention relates to the technical field of transformer substation perimeter security, relates to a laser fence, and particularly relates to a transformer substation perimeter laser fence position autonomous calibration system and method.
Background
At present, perimeter security of a transformer substation is usually prevented from being invaded by external personnel and animals through installing a fence, and plays an important role in guaranteeing power production safety, equipment property safety and personal safety. High-voltage power grid fences such as high-voltage electronic fence nets, pulse electronic fence nets and the like adopted by conventional regional perimeter security systems have the problems of high energy consumption, high management difficulty, weak system stability and high legal risk; the conventional optical fence such as an infrared light correlation electronic fence or video monitoring has the problems of high energy consumption, high false alarm rate and large interference caused by meteorological factors. The laser fence detects an intrusion signal by utilizing a laser beam correlation technology and can accurately alarm, has the advantages of good light beam directivity, long detection distance, stable performance, low failure rate and small maintenance amount, and becomes a novel technical means in recent years.
The distance between the emitting end and the receiving end of the wide-area laser fence is usually dozens of meters to hundreds of meters, and the tiny displacement of the vertical rod of the laser fence can also cause the laser beam of the laser fence to be incapable of being received in consideration of the extremely small emitting angle of the laser beam, so that false alarm is generated. Particularly, under a complex outdoor environment, the vertical rod support of the laser correlation perimeter security system generates mechanical deformation and deviates from a reference initial position due to the influence of factors such as long-time work, external environment damage, thermal expansion and cold contraction of a fence base and the like, so that the false alarm rate of the system is greatly increased, and the deep application of the laser correlation detection system is limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a transformer substation perimeter laser fence position automatic calibration system and method.
The purpose of the invention can be realized by the following technical scheme:
a transformer substation perimeter laser fence position automatic calibration system comprises at least two fence vertical rods which are oppositely arranged, the automatic calibration system comprises a laser calibration device a, a laser calibration device b1, a laser calibration device b2, a three-dimensional cloud deck, a cloud deck control device and a double-faced mirror, a transmitter and a receiver of the laser calibration device a are respectively arranged at the same height of two adjacent fence vertical rods in a reference initial position, a laser calibration device b1 and a laser calibration device b2 are respectively arranged at the same height of two adjacent fence vertical rods in the reference initial position, a transmitter and a receiver of the laser calibration device b1 are positioned on the same fence vertical rod, a transmitter and a receiver of the laser calibration device b2 are positioned on the other fence vertical rod, and the double-faced mirror is positioned at the midpoint of a connecting line of the laser calibration devices b1 and b2 in the reference initial position, the three-dimensional cloud platform is matched with the rail vertical rod and is vertically arranged on the three-dimensional cloud platform, the cloud platform control device is respectively connected with the laser calibration device a, the laser calibration device b1, the laser calibration device b2 and the three-dimensional cloud platform, and the three-dimensional cloud platform is controlled to move so as to calibrate the position of the rail vertical rod.
Further, the pan/tilt control device includes:
the presetting bit module is used for generating a presetting bit signal;
the autonomous calibration module responds when receiving a setting signal, and is used for generating a holder motion signal according to a feedback signal of the laser checking device a, the laser checking device b1 and/or the laser checking device b2, wherein the setting signal comprises a signal reaching a checking period or a system alarm signal;
and the motion control module is used for sending the preset bit signal or the holder motion signal to the three-dimensional holder.
Further, the autonomous calibration module comprises:
a check period selecting unit for setting a check period;
and the calibration mode selection unit is used for selecting a calibration mode according to the feedback signals of the laser verification device a, the laser verification device b1 and/or the laser verification device b 2.
Further, the autonomous calibration system further comprises a level meter, wherein the level meter is installed on the three-dimensional cradle head and is connected with the cradle head control device.
Further, the laser checking device a is arranged above the laser checking device b1 or the laser checking device b2, and the height of the laser checking device a is higher than that of the double-faced reflector.
The invention also provides a transformer substation perimeter laser fence position autonomous calibration method realized by using the autonomous calibration system, which comprises the following steps:
1) starting an autonomous calibration system;
2) judging whether the laser checking device a can receive laser, if so, finishing calibration, and if not, executing the step 3);
3) the three-dimensional tripod head drives the corresponding rail vertical rod to horizontally rotate under the control of the tripod head control device until the laser verification device b1 and the laser verification device b2 can respectively receive laser through the double-faced reflector;
4) judging whether the laser checking device a can receive the laser, if so, finishing the calibration, and if not, executing the step 5);
5) and taking one rail vertical rod as a reference, and adjusting the other rail vertical rod in the vertical direction until the laser verification device a can receive laser, so that the calibration is completed.
Further, in the step 1), the autonomous calibration system is started when an arrival check period signal or a system alarm signal is received.
Further, before step 2), the method further comprises:
the three-dimensional cradle head resets to a preset position under the control of the cradle head control device.
Further, before step 2), the method further comprises:
and judging whether the three-dimensional holder is horizontal, if so, executing the step 2), and if not, adjusting the three-dimensional holder to be horizontal and then executing the step 2).
The invention also provides the transformer substation perimeter laser fence capable of being calibrated autonomously, which comprises the autonomous calibration system.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention utilizes the principle of three points and one line to establish a double-sided reflector of a static reference object, combines a laser fence and a three-dimensional cradle head, is provided with three groups of laser calibration devices, utilizes the mode of laser beam reflection alignment, periodically and automatically detects the deviation degree of the vertical bar of the fence and the initial direction of a reference, and automatically adjusts the vertical bar of laser correlation.
2) The three groups of laser calibration devices are arranged, the rail vertical rods can be calibrated in the horizontal and vertical directions through the three-dimensional cradle head, and the calibration accuracy is improved.
3) The invention can also be provided with a level gauge, thereby conveniently realizing the level adjustment of the three-dimensional cradle head.
4) Compared with the traditional manual calibration, the method avoids the consumption of manpower and material resources, can calibrate the offset of the laser fence in time, solves the problem of misinformation of the vertical rod of the laser fence due to the mechanical deformation of the holder, realizes the self calibration of the laser fence system, and reduces the occurrence of misinformation.
Drawings
FIG. 1 is a block diagram of a laser fence calibration system;
FIG. 2 is a schematic illustration of a laser fence system being offset from a reference initial position;
FIG. 3 is a schematic diagram of laser calibration of a laser fence system from a baseline initial position;
FIG. 4 is a flowchart of laser calibration of the laser fence system from a baseline initial position;
FIG. 5 is a schematic view of a three-dimensional pan-tilt of the laser fence system;
fig. 6 is a block diagram of a laser fence system pan-tilt control system.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The autonomous calibration system provided by the embodiment is applied to the transformer substation perimeter laser fence, as shown in fig. 3, the perimeter laser fence includes at least two fence vertical bars 1 which are arranged oppositely, and the fence vertical bars 1 are installed on a fence. The montant support of laser correlation perimeter security protection system is through long-time work, external environment's destruction, factor influences such as the expend with heat and contract with cold of rail base, produce mechanical deformation and skew benchmark initial position, however, because the interval of laser rail montant is at tens meters to last hectometers, even the rail montant skew is small, receive the influence of the distance of being separated by, laser emitter and receiver on the laser rail that the rail montant carried on also with the skew benchmark initial position of great degree, the unable effective laser of receiving of receiver, the system false alarm rate increases by a wide margin. Fig. 2 is a schematic diagram of the deviation of the laser fence from the reference initial position, wherein the position of a point O in the diagram represents the position of the holder fixed end, the point P represents the position of the reference initial position, and the point Q represents the position of the corresponding monitoring point after the holder is deviated by a small angle and a short distance.
As shown in fig. 1 and 3, the autonomous calibration system includes a laser verification device a, a laser verification device b1, a laser verification device b2, a three-dimensional pan-tilt 2, a pan-tilt control device 3, and a double-sided mirror 4.
The transmitter and the receiver of the laser verification device a are respectively arranged at the same height of two adjacent fence vertical rods when the datum initial position is adopted, the transmitter b1 and the laser verification device b2 are respectively arranged at the same height of the two adjacent fence vertical rods when the datum initial position is adopted, the transmitter and the receiver of the laser verification device b1 are arranged on the same fence vertical rod, the transmitter and the receiver of the laser verification device b2 are arranged on the other fence vertical rod, and the laser verification device a can be arranged above the laser verification device b1 or the laser verification device b 2. The double-sided mirror 4 is located at the midpoint of the line connecting the laser verification devices b1 and b2 at the initial reference position, and is an absolute reference. The preset position of the double-sided mirror 4 is determined by the following procedure: the laser rail is located at the reference initial position, the double-faced reflector is adjusted to enable the laser verification devices b1 and b2 to receive laser signals respectively, and the position is fixed to be a preset position of the double-faced reflector 4.
The three-dimensional cloud platform 2 is matched with the rail vertical rod, the rail vertical rod is vertically arranged on the three-dimensional cloud platform 2, the cloud platform control device 3 is respectively connected with the laser calibration device a, the laser calibration device b1, the laser calibration device b2 and the three-dimensional cloud platform 2, and therefore the three-dimensional cloud platform is controlled to move to calibrate the position of the rail vertical rod.
The three-dimensional pan/tilt head 3 is composed of three servo motors in horizontal, pitch and vertical directions, and is realized by combining a single chip microcomputer control driving chip to perform three-dimensional motion of the pan/tilt head, so that four basic motion modes of up, down, left and right can be realized, as shown in fig. 5 and 6.
The pan-tilt control device 3 comprises a preset bit module 31, an autonomous calibration module 32 and an action control module 33, wherein the preset bit module 31 is used for generating a preset bit signal; the autonomous calibration module 32 responds when receiving a setting signal, and is used for generating a pan-tilt action signal according to a feedback signal of the laser checking device a, the laser checking device b1 and/or the laser checking device b2, wherein the setting signal comprises a signal reaching a checking period or a system alarm signal; the motion control module 33 is configured to send the preset bit signal or the pan/tilt/zoom signal to the three-dimensional pan/tilt/zoom apparatus.
The autonomous calibration module 32 may implement setting of the calibration period and selection of a calibration mode, which may be tilt calibration, horizontal calibration, vertical calibration, and the like.
In some embodiments, the autonomous calibration system may further include a level gauge, which is mounted on the three-dimensional pan/tilt head and connected to the pan/tilt head control device, for measuring an inclination of the three-dimensional pan/tilt head, thereby adjusting the three-dimensional pan/tilt head to be level.
The method for automatically calibrating the position of the perimeter laser fence of the transformer substation can be realized by utilizing the automatic calibration system, the three-dimensional cradle head is utilized to drive the vertical rods of the transmitting end and the receiving end of the laser fence placed on the three-dimensional cradle head to rotate at the horizontal azimuth and the vertical azimuth, the double-sided reflector and a laser detection system consisting of three groups of laser calibration devices are utilized to detect the deviation degree of the fence from the initial azimuth of the reference, and the deviation degree is fed back to a cradle head control system to control the cradle head to rotate, so that the automatic alignment and calibration of the laser fence are realized. As shown in fig. 4, the method comprises the steps of:
1) when a signal reaching the inspection period or a system alarm signal is received, starting the autonomous calibration system, and resetting the three-dimensional holder to a preset position under the control of the holder control device, wherein the three-dimensional holder may have slight offset or a base deforms;
2) the laser calibration mode can be selected according to different requirements, whether the three-dimensional tripod head is horizontal or not is judged firstly, if yes, the step 3 is executed), and if not, the three-dimensional tripod head is adjusted to be horizontal and then the step 3 is executed)
3) Judging whether the laser checking device a can receive laser, if so, finishing calibration, and if not, executing the step 4);
4) the three-dimensional tripod head drives the corresponding rail vertical rod to horizontally rotate according to the verification path under the control of the tripod head control device until the laser verification device b1 and the laser verification device b2 can respectively receive laser through the double-faced reflector;
5) judging whether the laser checking device a can receive laser, if so, finishing calibration, and if not, executing step 6);
6) and taking one rail vertical rod as a reference, and adjusting the other rail vertical rod in the vertical direction until the laser verification device a can receive laser, so that the calibration is completed.
The calibration process can be started when an alarm is met or started according to a set calibration period, for example, 1 month can be set for carrying out one-time autonomous calibration.
The embodiment also provides a transformer substation perimeter laser fence capable of being calibrated autonomously, which comprises the autonomous calibration system, so that autonomous calibration of deviation of the laser fence from a reference initial position can be realized, and false alarm is prevented.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. The autonomous calibration method of the transformer substation perimeter laser fence position autonomous calibration system is characterized in that the autonomous calibration system comprises at least two fence vertical rods which are arranged oppositely, the autonomous calibration system comprises a laser calibration device a, a laser calibration device b1, a laser calibration device b2, a three-dimensional cradle head, a cradle head control device and a double-faced reflector, a transmitter and a receiver of the laser calibration device a are respectively arranged at the same height of two adjacent fence vertical rods at the initial reference position, the laser calibration device b1 and the laser calibration device b2 are respectively arranged at the same height of two adjacent fence vertical rods at the initial reference position, the transmitter and the receiver of the laser calibration device b1 are positioned on the same fence vertical rod, the transmitter and the receiver of the laser calibration device b2 are positioned on the other fence vertical rod, and the double-faced reflector is positioned on the laser calibration device b1, b2, the three-dimensional cradle head is matched with the rail vertical rod at the connecting midpoint of the reference initial position, the rail vertical rod is vertically arranged on the three-dimensional cradle head, the cradle head control device is respectively connected with the laser calibration device a, the laser calibration device b1, the laser calibration device b2 and the three-dimensional cradle head, and the three-dimensional cradle head is controlled to move so as to calibrate the position of the rail vertical rod;
the autonomous calibration method comprises the following steps:
1) starting an autonomous calibration system;
2) judging whether the laser checking device a can receive laser, if so, finishing calibration, and if not, executing the step 3);
3) the three-dimensional tripod head drives the corresponding rail vertical rod to horizontally rotate under the control of the tripod head control device until the laser verification device b1 and the laser verification device b2 can respectively receive laser through the double-faced reflector;
4) judging whether the laser checking device a can receive laser, if so, finishing calibration, and if not, executing the step 5);
5) and taking one rail vertical rod as a reference, and adjusting the other rail vertical rod in the vertical direction until the laser verification device a can receive laser, so that the calibration is completed.
2. The autonomous calibration method of the substation perimeter laser fence position autonomous calibration system according to claim 1, wherein the pan-tilt control device comprises:
the presetting bit module is used for generating a presetting bit signal;
the autonomous calibration module responds when receiving a setting signal, and is used for generating a holder motion signal according to a feedback signal of the laser checking device a, the laser checking device b1 and/or the laser checking device b2, wherein the setting signal comprises a signal reaching a checking period or a system alarm signal;
and the motion control module is used for sending the preset bit signal or the holder motion signal to the three-dimensional holder.
3. The autonomous calibration method of the substation perimeter laser fence position autonomous calibration system of claim 1, wherein the autonomous calibration module comprises:
a check period selecting unit for setting a check period;
and the calibration mode selection unit is used for selecting a calibration mode according to the feedback signals of the laser verification device a, the laser verification device b1 and/or the laser verification device b 2.
4. The autonomous calibration method of the substation perimeter laser fence position autonomous calibration system according to claim 1, characterized in that the autonomous calibration system further comprises a level gauge, the level gauge is mounted on the three-dimensional pan-tilt and connected to the pan-tilt control device.
5. The autonomous calibration method of the autonomous calibration system for the substation perimeter laser fence position according to claim 1, wherein the laser verification device a is arranged above the laser verification device b1 or the laser verification device b2 and is arranged at a height higher than that of the double-faced reflector.
6. The autonomous calibration method of the substation perimeter laser fence position autonomous calibration system according to claim 1, characterized in that in step 1), the autonomous calibration system is started when a verification period arrival signal or a system alarm signal is received.
7. The autonomous calibration method of the substation perimeter laser fence position autonomous calibration system according to claim 1, further comprising, before step 2):
the three-dimensional cradle head resets to a preset position under the control of the cradle head control device.
8. The autonomous calibration method of the substation perimeter laser fence position autonomous calibration system according to claim 1, further comprising, before step 2):
and judging whether the three-dimensional holder is horizontal, if so, executing the step 2), and if not, adjusting the three-dimensional holder to be horizontal and then executing the step 2).
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| CN111080945A (en) * | 2019-12-05 | 2020-04-28 | 北京无线电计量测试研究所 | Gas operation field dynamic sensing system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005097A (en) * | 2010-09-25 | 2011-04-06 | 公安部第三研究所 | Infrared laser perimeter protection method |
| CN103078678A (en) * | 2012-12-29 | 2013-05-01 | 中国航天科技集团公司第五研究院第五一三研究所 | Satellite-borne laser wireless energy transmission system |
| CN205140116U (en) * | 2015-12-03 | 2016-04-06 | 国网江西省电力公司抚州供电分公司 | Security fence alarm |
| CN107489114A (en) * | 2017-08-30 | 2017-12-19 | 广西电网有限责任公司电力科学研究院 | A kind of laser alertness safe fence |
| CN206848498U (en) * | 2017-06-09 | 2018-01-05 | 中国石油化工股份有限公司 | A kind of perimeter alarm light path regulating device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7068991B2 (en) * | 1997-05-09 | 2006-06-27 | Parise Ronald J | Remote power recharge for electronic equipment |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005097A (en) * | 2010-09-25 | 2011-04-06 | 公安部第三研究所 | Infrared laser perimeter protection method |
| CN103078678A (en) * | 2012-12-29 | 2013-05-01 | 中国航天科技集团公司第五研究院第五一三研究所 | Satellite-borne laser wireless energy transmission system |
| CN205140116U (en) * | 2015-12-03 | 2016-04-06 | 国网江西省电力公司抚州供电分公司 | Security fence alarm |
| CN206848498U (en) * | 2017-06-09 | 2018-01-05 | 中国石油化工股份有限公司 | A kind of perimeter alarm light path regulating device |
| CN107489114A (en) * | 2017-08-30 | 2017-12-19 | 广西电网有限责任公司电力科学研究院 | A kind of laser alertness safe fence |
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