CN102944992A

CN102944992A - Real-time clock timing device and method thereof in online monitoring of high-voltage line arrester

Info

Publication number: CN102944992A
Application number: CN2012105110475A
Authority: CN
Inventors: 严结实; 张杭; 刘吕娜
Original assignee: China XD Electric Co Ltd
Current assignee: China XD Electric Co Ltd
Priority date: 2012-11-30
Filing date: 2012-11-30
Publication date: 2013-02-27
Anticipated expiration: 2032-11-30
Also published as: CN102944992B

Abstract

The invention provides a real-time clock timing device and a method thereof in online monitoring of a high-voltage line arrester, mainly aiming to solve the timing problem in the online monitoring of the high-voltage line arrester. The method specifically comprises the steps that: a shortwave receiving unit receives a shortwave time signal, and obtains integral point timing pulses which are several continuous pulse signals, through demodulation; a timing pulse conversion module converts the demodulated integral point timing signal into an integral point synchronous pulse-per-second signal; and an RTC (Real Time Clock) clock chip realizes integral point timing by means of the integral point pulse-per-second signal. The real-time clock timing device performs integral point timing on the real-time clock chip (RTC) once or twice each day by means of the national 5 MHz or 10 MHz shortwave timing system so that the time of day is accurate within one hundred milliseconds; the timing accuracy of the shortwave timing system is 1-3 milliseconds by means of ionospheric propagation; and the receiving system is low in manufacturing cost and not limited by natural conditions, and is very suitable for wild timekeeping or timing application.

Description

Real-time clock correction device and method thereof in the high-voltage line lightning arrester on-line monitoring

Technical field

The present invention relates to the high-voltage line lightning arrester on-line monitoring, the problem during school that mainly solves real-time clock (RTC) Accumulated deviation.For the accurate recording thunderbolt provides safeguard constantly.

Background technology

Because leakage conductor is installed on the high voltage line iron tower, be in high aerial, high-tension line corridor majority be in have inconvenient traffic, place that human footmarks are rare, also to cross over a hill, cross a river strides river etc., patrol and examine difficult in maintenance greatlyr, the urgency of on-line monitoring increases severely day by day, and the record thunder and lightning is constantly particularly outstanding; In the thunder and lightning prone areas, hi-line the most easily meets with thunderbolt, causes line tripping, line attendant urgently will be known the correct time that thunderbolt occurs, with analysis of failure, avoid all reasons be attributed to the thunderbolt and concealed the equipment faults itself, further cause larger loss; Simultaneously, carry out line upkeep for line attendant and line thunder protection provides reference frame.

At present, most real-time timepiece chip (RTC:Real-Time Clock) timing modes that adopt, but, because there is the accuracy of timekeeping problem in clock chip, pass in time timing generation deviation, time, longer cumulative errors were larger, if untimely calibration, the thunderbolt of recording can cause erroneous judgement or misjudgement to the analysis circuit tripping operation constantly.

Country's shortwave time dissemination system includes time (UTC) information, platform is exhaled (BPM) information etc., repeats once per half an hour, utilizes ionospheric propagation, time service error 1-3 millisecond; The markers of leakage conductor on-line monitoring adopts real-time timepiece chip (RTC) more, its precision is generally about ± 3PPM, take ± 3PPM as example, day accumulation maximum error ± 260 millisecond, to secondary, can satisfy the requirement of real-time of leakage conductor on-line monitoring to real-time timepiece chip (RTC) synchronous an every day.

Summary of the invention

For solving above technical matters, the invention provides real-time clock correction device and method thereof in a kind of high-voltage line lightning arrester on-line monitoring, utilize national 5MHz or 10MHz shortwave time dissemination system that real-time timepiece chip (RTC) is carried out one every day during to the integral point school of secondary, Time of Day is accurately in hundred milliseconds.

For achieving the above object, the present invention is by the following technical solutions:

Real-time clock correction device in a kind of high-voltage line lightning arrester on-line monitoring, the short-wave reception unit that comprises pulse when receiving the shortwave time signal and reconciling out school when whole, pulse converter unit when school clock pulse red switch becomes the school of integral point synchronization pulse second when whole, the output terminal of pulse converter unit links to each other with the input end of real-time timepiece chip during described school.

As the preferred embodiments of the present invention, the wavelength of described shortwave time signal is 5MHz or 10MHz.

As the preferred embodiments of the present invention, described when whole during the school pulse be continuous a plurality of pulse signal.

Real-time clock calibration method in a kind of high-voltage line lightning arrester on-line monitoring, short-wave reception unit receive the shortwave time signal, and pulse when demodulating the integral point school, are continuous several pulse signals; The pulse conversion module is transformed into integral point synchronization pulse second with the integral point correcting delay signal of demodulation during the school, when the RTC clock chip utilizes the integral point pps pulse per second signal to realize the integral point school.

As the preferred embodiments of the present invention, the implementation method of described integral point pulse per second (PPS) is: at first the radiothermy demodulation techniques parse integral point BPM Morse and call out code, take Morse code finish time as reference, produce a pulsewidth and be 2000 milliseconds monopulse, take this monopulse as thresholding, first zero-crossing pulse that again occurs in 10 pulses is the integral point pulse per second (PPS).

As the preferred embodiments of the present invention, the implementation method of described integral point pulse per second (PPS) is: after the short-wave reception unit receives the shortwave time signal, use the shortwave demodulation techniques and demodulate the temporal information code, the application of synchronized coherent demodulation technology parses BPM Morse platform and exhales code in the temporal information code, take this yard finish time as reference, produce (2000+150) ms single pulse signal, with this pulse as thresholding, with the temporal information code of demodulation be the multiple-pulse phase with, can obtain a second synchronizing pulse.

As the preferred embodiments of the present invention, described RTC clock chip produces synchronous enabled, only allows integral point synchronous second synchronous enabled effective delicacies of the season.

Compared with prior art, correction device of the present invention and method thereof have the following advantages at least: the shortwave time dissemination system, utilize ionospheric propagation, time service precision 1-3 millisecond, the present invention utilizes national 5MHz or 10MHz shortwave time dissemination system that real-time timepiece chip (RTC) is carried out one every day during to the integral point school of secondary, and accurately in hundred milliseconds, receiving system is cheap for Time of Day, not limited by natural conditions, use when very being fit to field timing or school.

Description of drawings

Fig. 1 is the structured flowchart of the real-time clock correction device in the high-voltage line lightning arrester on-line monitoring of the present invention.

Fig. 2 is BPM country's shortwave time service platform broadcast program of the present invention and time signal format chart.

Fig. 3 is BPM shortwave time service demodulation of the present invention and the integral point synchronous schematic diagram that produces second.

Fig. 4 enables the EN sequential chart when being integral point pulse per second (PPS) SP of the present invention and school.

Embodiment

Describe the present invention below in conjunction with accompanying drawing:

Real-time clock correction device in the high-voltage line lightning arrester on-line monitoring of the present invention comprises the short-wave reception unit, pulse converter unit during the school, and RTC time chip, described short-wave reception unit is used for receiving the shortwave time signal, the 5MHz that country's shortwave time service platform sends or the information reference table 1 that gives the correct time of 10MHz, after the short-wave reception unit receives the shortwave time signal, use the shortwave demodulation techniques and demodulate the temporal information code, the application of synchronized coherent demodulation technology parses BPM Morse platform and exhales code in the temporal information code, take this yard finish time as reference, produce (2000+150) ms single pulse signal, with this pulse as thresholding, with the information code of demodulation be the multiple-pulse phase with, can obtain a second synchronizing pulse (multiple-pulse), can obtain integral point synchronizing pulse second (monopulse) through monostable circuit in the pulse converter unit when this second, synchronizing pulse was sent to the school, carry out time synchronized with this pulse as the second synchronizing pulse of real-time timepiece chip RTC, referring to Fig. 2 (producing synchronously the time service demodulation of BPM shortwave and integral point second schematic diagram).

According to accuracy requirement and manufacturing cost requirement, can satisfy the accuracy of timekeeping requirement once or twice every day synchronously, so produce synchronous enabled (EN) by RTC, only just carries out integral point effectively the time at synchronous enabled (EN) synchronous second, makes synchronization point controlled.Because short-wave signal passes through ionospheric propagation, night signal is relatively stable, in conjunction with TRC to the time characteristics, multiselect is when midnight, integral point carried out the school, so, pulse enable SP signal when utilizing the timing function of RTC to produce the school, the control when reaching the integral point school or during a plurality of integral points school, the i.e. purpose of " when allowing some school with regard to some school time ", sequential relationship enable the EN sequential chart during with reference to figure 3(integral point pulse per second (PPS) SP and school).

Claims

1. the real-time clock correction device in the high-voltage line lightning arrester on-line monitoring, it is characterized in that: the short-wave reception unit that comprises pulse when receiving the shortwave time signal and reconciling out school when whole, pulse converter unit when school clock pulse red switch becomes the school of integral point synchronization pulse second when whole, the output terminal of pulse converter unit links to each other with the input end of real-time timepiece chip during described school.

2. the real-time clock correction device in a kind of high-voltage line lightning arrester on-line monitoring as claimed in claim 1, it is characterized in that: the wavelength of described shortwave time signal is 5MHz or 10MHz.

3. the real-time clock correction device in a kind of high-voltage line lightning arrester on-line monitoring as claimed in claim 1 or 2 is characterized in that: described when whole during the school pulse be continuous a plurality of pulse signal.

4. the real-time clock calibration method in the high-voltage line lightning arrester on-line monitoring, it is characterized in that: the short-wave reception unit receives the shortwave time signal, and pulse when demodulating the integral point school, is continuous several pulse signals; The pulse conversion module is transformed into integral point synchronization pulse second with the integral point correcting delay signal of demodulation during the school, when the RTC clock chip utilizes the integral point pps pulse per second signal to realize the integral point school.

5. the real-time clock calibration method in a kind of high-voltage line lightning arrester on-line monitoring as claimed in claim 4, it is characterized in that: the implementation method of described integral point pulse per second (PPS) is: at first the radiothermy demodulation techniques parse integral point BPM Morse and call out code, take Morse code finish time as reference, produce a pulsewidth and be 2000 milliseconds monopulse, take this monopulse as thresholding, first zero-crossing pulse that again occurs in 10 pulses is the integral point pulse per second (PPS).

6. the real-time clock calibration method in a kind of high-voltage line lightning arrester on-line monitoring as claimed in claim 4, it is characterized in that: the implementation method of described integral point pulse per second (PPS) is: after the short-wave reception unit receives the shortwave time signal, use the shortwave demodulation techniques and demodulate the temporal information code, the application of synchronized coherent demodulation technology parses BPM Morse platform and exhales code in the temporal information code, take this yard finish time as reference, produce (2000+150) ms single pulse signal, with this pulse as thresholding, with the temporal information code of demodulation be the multiple-pulse phase with, can obtain a second synchronizing pulse.

7. such as the real-time clock calibration method in claim 4 or the 5 described a kind of high-voltage line lightning arrester on-line monitorings, it is characterized in that: described RTC clock chip produces synchronous enabled, only allows integral point synchronous second synchronous enabled effective delicacies of the season.