CN1811477A - Lightning arrester leakage current and action frequency real-time monitoring system - Google Patents
Lightning arrester leakage current and action frequency real-time monitoring system Download PDFInfo
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- CN1811477A CN1811477A CN 200610023889 CN200610023889A CN1811477A CN 1811477 A CN1811477 A CN 1811477A CN 200610023889 CN200610023889 CN 200610023889 CN 200610023889 A CN200610023889 A CN 200610023889A CN 1811477 A CN1811477 A CN 1811477A
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Abstract
The present invention relates to a lighting arrester leakage current and operating frequency real-time monitoring system. It includes a local monitoring unit containing sensor series-connected on the arrester grounding wire and wireless data transmission terminal connected with said sensor, a trust server placed in the interior of mobile communication centre and a main machine monitoring system in a computer. Said invention adopts distributed structure, can make local measurement and data transmission.
Description
Technical field
The present invention relates to a kind of leakage current of an arrester and action frequency real-time monitoring system.Be specially adapted to the on-line monitoring of the lightning arrester on high-voltage fence, generating plant, transformer station and the power equipment.
Background technology
Lightning arrester on-line monitoring instrument in existing generating plant, the transformer station is mainly used to monitor the leakage current and the action frequency of lightning arrester." lightning arrester leakance detect and discharge counter " that provides as Chinese patent ZL93111792.5, it has changed the detection mode of former lightning arrester, the counter of lightning arrester is designed to an one-piece construction with the milliammeter that detects leakage current, both can monitor lightning arrester leakance and change, can under the thunder-strike current effect, count again.But it must be checked to the scene by the operator on duty, if meet rain, thunder, weather such as dense fog has inconvenience more, and easily carelessness can not in time be found or be reported to the police in case undesirable conditions such as lightning arrester makes moist, mechanical defect occur, is difficult to avoid the generation of accident.
Leakage current of an arrester and action frequency on-line detector device are all only paid attention to sample of signal mode and measuring principle as above-mentioned in addition, as long as be convenient to install and be convenient to customer inspection, record.Operation, inspection and management mode before the user also just continues.Do not consider that can pick-up unit provide valid data and help for repair based on condition of component, because, existing lightning arrester on-line monitoring instrument generally all adopts pointer-type gauges to add machinery or pulsed counter, owing to be not digital circuit, measured data can not be stored on the spot and utilize, again because monitoring device is installed on the scene, away from central station of floating dock, to operational monitoring, check meter etc. all very inconvenient, particularly in case have accident generation or critical event to judge, its fault data can't be related and be recurred again, influences the analysis and the judgement of accident.
Existing data acquisition and monitoring system all adopt concentrated measurement structure, are about to all measured signals and collect in a place, gather measurement one by one by harvester, and that just often says patrols and examines metering system.Although this routine inspection mode is widely adopted (as monitoring of multi-point temp, electric current, voltage etc.), when being used for Transformer Substation Online Monitoring System, but there is the problem of following several aspects.
1) the long Distance Transmission problem of tested simulating signal:
Because exist strong power frequency electromagnetic field to disturb in the transformer station, utilize the long Distance Transmission simulating signal of shielded cable, though can suppress the interference problem of power frequency electric field, the interference of power frequency magnetic field is worked hardly, this is a frequent ignored problems.
2) can't judge the real conditions of equipment under test:
The substation operation scene has several factors can influence system monitoring data accuracy and stability, except that the power frequency disturbing factor, also has following reason: the variation of ambient temperature and humidity and the influence of surface leakage current etc.When these factors changed, Monitoring Data all can fluctuate thereupon, and irregular saying, and original monitoring system often can not correctly be discerned judgement, also just can't understand the real conditions of equipment under test certainly.
3) operational reliability is poor, and failure rate is high:
Except changing, causes some measuring error ambient temperature and humidity, transformer in the transformer station or the operation of the switching of circuit, tend to produce stronger dash current, cause existing between the different earth points higher potential difference (PD), just common " earth potential is raised " problem said of people.If monitoring system adopts " single-point grounding " mode, can prevent " earth potential is raised " harmful effect effectively to measurement component, but because all inspection type monitoring systems need be pooled to main frame to a plurality of measured signal slave unit operations scene at present, requirement based on security of operation and anti-interference aspect, on engineering, often be difficult to solve the single-point grounding problem in electric measurement loop, be subjected to " earth potential impact " in case monitoring system is in operation, the common mode voltage that moment produces causes the damage of electron device probably.Here it is, and some monitoring system can be moved in the laboratory well, and frequently breaks down later on (for example the amplifying circuit in the current sensor damage) being installed to transformer station, even the reason that also can't normally move through maintain and replace repeatedly.
In sum, for an on-line monitoring system that measuring principle is correct, if neither one preferably version cooperate with it, not only can influence the validity of Monitoring Data, guaranteeing aspect the operation continuity of system it also is being difficulty comparatively.
Summary of the invention
Purpose of the present invention is exactly the complicacy at the substation operation scene, and the singularity of tested insulation parameter, provide a kind of on-line monitoring system to adopt and the diverse structure of above-mentioned technology monitoring system formerly, the on-the-spot interference and the operational reliability problem be can solve preferably, the long Distance Transmission problem and the earth potential shock problem of measured signal thoroughly stopped.
To achieve the above object, leakage current of an arrester of the present invention with the technical scheme that action frequency real-time monitoring system is taked is: it comprises: contain the local monitoring means of sensor that is connected on the arrester ground line and the wireless data transmission terminal that is connected with sensor, place the intracardiac trusteeship service device of mobile communication and place the interior host monitor system of computing machine.
As above-mentioned structure, be installed in sensor in the local monitoring means on the arrester ground line in real time with the leakage current values noted and thunderbolt number of times, be transported to wireless data transmission terminal; Wireless data transmission terminal becomes simulating signal into digital signal, and forms infomational message and be sent on the trusteeship service device that places in the mobile communication center (wireless network GSM's) with the form of short message; The trusteeship service device transfers to the host monitor system that places in the computing machine (what have little time to pass on to be temporarily stored in the buffer, to wait pass on) with the infomational message of receiving; The host monitor system will receive and deposit in the database after infomational message transforms ripe data (or claiming simulating signal) by its message order format, understand the operation conditions of all kinds of lightning arresters in real time for the user, be convenient to equipment operation maintenance and management, the host monitor system also can send the various information instruction of asking for to wireless data transmission terminal by the trusteeship service device, and equipment is configured and debugs.
As above-mentioned structure, leakage current of an arrester of the present invention and action frequency real-time monitoring system have significant advantage.
1. real-time monitoring system of the present invention is measured on the spot because comprise the local monitoring means that is connected on each arrester ground line, by the wireless data transmission terminal wirelessly transmitting data, is distributed structure.The long-distance cable transmission of measured signal and the problem that earth potential impacts have been stopped up hill and dale;
2. real-time monitoring system transmission data of the present invention rapidly, accurately, reliably.Because the data of measuring on the spot in the real-time monitoring system of the present invention, the process wireless data transmission terminal is sent to infomational message the trusteeship service device that places mobile communication intracardiac with the form of short message, the trusteeship service device will promptly be transferred to the host monitor system, just message information can be delivered in the host monitor system in the time about 30 seconds usually.So, reached the purpose of real-time monitoring fully.
3. real-time monitoring system of the present invention is the communication gsm cellular network that adopts because communication unit is by placing the intracardiac trusteeship service device of mobile communication, and this network coverage face is big, and the blind area is less.And be to adopt host monitor system and the direct coupled mode in mobile communication center.Therefore, not only speed is fast, and the data of transmitting-receiving are accurate.
4. real-time monitoring system of the present invention need not the technician and obtains data to the scene because be wireless real-time transmission data.Obviously, saved manpower, material resources.Simultaneously, the situation of display device operation in real time, thus accelerated can improve the security and the reliability of equipment moving to equipment failure or unusual judgement.
5. real-time monitoring system of the present invention helps the ruuning situation of lightning arrester is carried out analysis and the statistics of long period because the host monitor system can offer the data and the historical data of the required inquiry lightning arrester of user real time execution.
Description of drawings
Fig. 1 is the structural representation of real-time monitoring system of the present invention;
Fig. 2 is the structural representation of sensor in the local monitoring means;
Fig. 3 is the structural representation of the wireless data transmission terminal in the local monitoring means;
Fig. 4 is the structural representation of host monitor system;
Fig. 5 is the process flow diagram of real-time monitoring system of the present invention.
Embodiment
Further specify the architectural feature and the progressive thereof of real-time monitoring system of the present invention below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of real-time monitoring system of the present invention.As shown in Figure 1.It comprises real-time monitoring system of the present invention: contain the sensor 101 that is connected on the lightning arrester 2 ground connection D1 lines and the local monitoring means 1 of the wireless data transmission terminal 102 that is connected with sensor 101, place the trusteeship service device 4 in the mobile communication center (wireless network GSM) 3 and place host monitor system 6 in the computing machine 5.
Fig. 2 is the structural representation of the sensor 101 in the local monitoring means in the real-time monitoring system of the present invention.It comprises the current transducer (or claiming current transformer) 1011 on the ground wire that is connected between lightning arrester 2 and the ground connection D1, the high speed integrator 1012 that is connected with current transducer 1011 output terminals, the amplification amplitude modulator 1013 that is connected with high speed integrator 1012 output terminals, respectively with amplify the signal trace follower 1014 that amplitude modulator 1013 is connected, thunderbolt time counter 1015 and leakage current collection device 1017, the reset signal input source 1016 that is connected with leakage current collection device 1017 with thunderbolt time counter 1015 respectively.Three kinds of output signals 1,2,3 are arranged on the sensor 101.Use direct current ± 5V power supply.
In the present embodiment, adopt AMB-05 type sensor (by another patented technology is provided).Be used for the measurement of Leakage Current of Zinc-oxide Lightning Arresters.Design is based on the principle of work of current transformer (current transducer); The big electric current that current transformer will receive becomes little electric current, through the high speed integrator current value is become magnitude of voltage, after through the amplification amplitude modulator its waveform being carried out the shaping amplification again, be input to signal trace follower, thunderbolt time counter and leakage current collection device respectively, thunderbolt number of times and the leakage current values noted in time are transported to wireless data transmission terminal.Its advantage is that measurement range is wide, and the linearity is good, and shock-resistant electric current is strong, and is safe and reliable etc., is that conventional piezoelectric formula sensor is unrivaled.Because former detector when the thunderbolt heavy current impact, is to obtain the counting thunder value by the protection of zinc paste transition inhibition assembly.But, when thunderbolt produces, the protection from transients assembly is caused bigger impact, cause the damage of sensor easily.And the mounting means of AMB-05 sensor to be primary side and arrester ground end be directly connected to ground, secondary side has increased holding circuit with primary side in the coupling link and has been connected in sample circuit then, can directly not bear big rush of current, and is much safe and reliable.This sensor can be experienced the lightning strike signals of 5～100us deration of signal simultaneously in addition, has the function of lightning stroke counter.
The technical characteristic that AMB-05 sensor in the present embodiment has is: leakage current monitoring full scale is 3.0mA; Resolution is 3.0uA; Precision is 1%; The linearity is 1%; Lightning stroke counter is 5～200us to the response of thunderbolt pulsewidth; Counting thunder response current starting point is≤50A; Bearing maximum thunder-strike current is＞20000A; Counter is 0～1023 cycle count; Be to be set in 995 times during product export; The sensor ground wire is a copper rod, and the resistance of copper rod self is 2 micro-ohms.
Fig. 3 is the structure of the wireless data transmission terminal in the local monitoring means.As shown in Figure 3.Wireless data transmission terminal comprises: data processing unit, wireless transmission unit and solar electric power supply system three parts.
Wherein, data processing unit comprises isolated drive circuit 1021, A/D modular converter 1023 and the central processor CPU 1025 of the mutual series connection that is connected with sensor; Wireless transmission unit comprises gsm wireless transceiver module 1022 and connector 1024, and connector 1024 is the RS485/232 interface in the present embodiment; It is responsible for effective information is sent, with execution, operation etc. after the command information digestion process.Working properly for guaranteeing electric power system, wireless data transmission terminal has disposed the solar electric power supply system that comprises battery pack 1026 in solar cell 1028, solar charging controller 1027 and the machine also according to the operate outside environment requirement.
As Fig. 3 structure,, remove undesired signal through isolated drive circuit 1021 (holding circuit---photoelectricity is isolated) and deliver to A/D modular converter 1023 by the signal of spot sensor input; A/D modular converter 1023 becomes digital signal with analog signal conversion, delivers in the central processor CPU 1025; 1025 pairs of data-signals of central processor CPU convert digital signal to, deliver in the central processor CPU 1025; 1025 pairs of data of central processor CPU are handled, and promptly form infomational message, deliver to wireless transmission unit then; Infomational message sends this message information according to the communications protocol requirement of gsm wireless communication network in the mode of short message through RS-232/RS-485 interface and gsm wireless transmitting-receiving (GSM-MODEM) module.The wireless data transmission terminal of taking patent No. ZL200420019939.4 to be provided in the present embodiment, its mainly intact local monitoring means and functions such as the wireless connections of moving logical sms center (GSM) network, processing short message receiving-transmitting.This mode of utilizing public network to realize data communication had both solved the key issue of remote data communication, had reduced system cost and investment again, was the unlimited robotization means of communication of a kind of application prospect, should actively apply.
Described central processor CPU 1025 is to select strong, the low-power consumption technical grade chip of antijamming capability for use.Mainly finish functions such as internal control, data processing, fault data storage and inside processing scheduling, also have the fault self-recovering function in this central processor CPU 1025, improved the antijamming capability and the reliability of data collection station greatly.Function when internal clocking and school are arranged in the wireless data transmission terminal all has time tag during data information transfer, these can remedy the problems such as data delay in the note data communication process.
As above-mentioned, the electric power system of wireless data transmission terminal configuration is a solar cell system.This is that wireless data transmission terminal can not have a power failure again when work owing to do not have condition of power supply under open-air a lot of occasion.Therefore, adopt sun power and battery pack that the additional energy is provided, guaranteed wireless data transmission terminal continuously, work incessantly.
Wireless data transmission terminal is placed in the local monitoring means of monitored lightning arrester, and the data in the device fabrication operational process are gathered and detected; If this wireless data transmission terminal then must not be applied to the collection point with operation circuit, so both enlarged system's investment, be unfavorable for production management again.Monitored equipment is installed wireless data transmission terminal and can by mobile communication center (GSM) network the data message message that produces be sent fast, and message information can be finished through the host monitor system and receive and handle, and realizes monitoring and management to operational outfit.
Fig. 4 is the host monitor system 6 that places in the computing machine 5.As shown in Figure 4, place the host monitor system 6 in the computing machine 5 to comprise: to receive the information receiving module 602 that transmits infomational message from mobile communication center (GSM) interior trusteeship service device, the message processing module 603 of processing message information that is connected with information receiving module 602 and transmission instruction, the database 601 that is connected with message processing module 603, configuration and debugging module 604 and display alarm module 605 respectively.
Described configuration and debugging module 604 dispose for day-to-day operation, maintenance, system debug specially, and the message processing module 603 that links to each other with it can send to local monitoring means by it and ask for various information instruction; Because the host monitor system offers places such as transformer station or power plant and uses, and the object-based device numbering of each use, performance, technical parameter are all different, and one time junction style is also different, and the safe class of equipment and warning definite value are also inequality.So need to give one of user oneself can make things convenient for the instrument of operation maintenance and debugging; As internal clocking, the alarm times of terminal device, threshold value of electric current etc. be set; After also having the on-the-spot installation of wireless data transmission terminal, need at once to carry out " dialogue ", just must use this module to finish to open and put into operation with the operation interface of host monitor system.
Fig. 5 is the process flow diagram of real-time monitoring system of the present invention.As shown in Figure 5, the flow process of real-time monitoring system of the present invention:
The first step 01 at first is directly to place the sensor of the local monitoring means at lightning arrester scene to carry out data acquisition, promptly measure the leakage current and the thunderbolt action frequency of lightning arrester, and the result that will measure is input to wireless data transmission terminal;
Second step 02, wireless data transmission terminal receives the signal of carrying from sensor and carries out data processing, at first remove undesired signal through isolated drive circuit, through the A/D modular converter simulating signal is become digital signal, form infomational message through central processor CPU again and report, be sent to through wireless transmission unit in the mode of short message and place on the intracardiac trusteeship service device of mobile communication;
In the 3rd step 03, the trusteeship service device receives the infomational message of sending from wireless data transmission terminal, transmits to the host monitor system immediately; The infomational message that has little time to transmit is temporarily stored in the buffer, waits to have an opportunity to transmit at any time;
In the 4th step 04, host monitor system (place computing machine in) receives infomational message from the trusteeship service device on the one hand, is sent to wireless data transmission terminal by the trusteeship service device by the configuration of system and debugging module 604 on the one hand and asks for the detection information instruction; After the host monitor system receives message information, handle, promptly decompose the content of message information, convert thereof into ripe data (or claiming analog signal data), deposit in the database 601 on the one hand; With the current value contrast that allows, whether surpass the current value that allows on the one hand;
In the 5th step 05, if surpassed the current value that allows, then report to the police immediately, and check and readjust the alarming value of equipment (lightning arrester system); Do not carry out next step if surpass the current value that allows;
The 6th step 06 showed or the printing monitoring result, made the user can inquire about real-time Monitoring Data and the historical data that deposits in the database at any time by this window.
Described wireless data transmission terminal (hereinafter to be referred as " terminal ") be that infomational message is formed in Information Monitoring, it reports the form of message that 5 kinds of order formats are arranged usually:
T-detected value report (receive host monitor system [hereinafter to be referred as " main frame "] and send the detection instruction, terminal detects as requested at once, reports then)
A-status report (receive main frame and send the read states instruction, terminal reports local state at once)
R-alarm report (terminal finds that image data is out-of-limit, at once out-of-limit value is reported)
S-setting value report (terminal receive that main frame sends read the setting value instruction, the thresholding setting value of this locality etc. is reported)
C-confirmation command (terminal receive host command after, the affirmation information of sending)
Report message format for example to have:
(1) test value message format (30 of total lengths):
T＜station number〉＜report time〉＜leakage current〉＜action frequency〉＜cell voltage〉＜the system reset number of times〉＜check code〉＜the difference sign indicating number 〉
Field type and length:
＜station number 〉: letter/number, 4
＜report time 〉: numeral, 6, HHMMSS
＜leakage current 〉: numeral, 4,0000～1023
＜action frequency 〉: numeral, 4,0000～1023
＜cell voltage 〉: numeral, 4,0000～1023 (1023=12V)
＜system reset number of times 〉: numeral, 4,0000～9999
＜check code 〉: hexadecimal code, 2
＜difference sign indicating number 〉: printable character, 1
Annotate: this message need not the host monitor system be replied.
Example: message is: T10001200000010000110230001115 from front to back
Cutting apart message information from front to back is: station number: the data representation station number in (1000) bracket is 1000; Report time: the data representation message reporting time in (120000) bracket is 12:00; Leakage current: the data in (0010) bracket are the about 0.293mA of back expression leakage current values as calculated; Action frequency: the data representation in (0001) bracket has moved once; Cell voltage: data represent that voltage is 12V in the back as calculated in (1023) bracket; DPS once resetted once in system reset number of times (0001) bracket; Check code: the check code that the data representation computing machine produces in (11) bracket is 11; The difference sign indicating number: the difference sign indicating number that DPS produces in (5) bracket is 5;
Wherein check code and difference sign indicating number just adopt hypothesis (by inserting after the COMPUTER CALCULATION) here;
In the present embodiment, the host monitor examining system has 10 kinds of order formats (mainly the virgin state to terminal device is configured, checks and debugs) to wireless data transmission terminal:
T--is provided with clock instruction (main frame is provided with synchronous clock to terminal)
A--calibration clock instruction (main frame carries out clock alignment to terminal)
M--is provided with report time instruction (setting reports the message time to main frame to terminal)
U--is provided with station number cipher instruction (main frame is provided with station number and password to terminal)
V--is provided with GSM number instruction (main frame is provided with GSM number terminal)
B--reports test value instruction (main frame requires terminal that current test result is reported)
P--is provided with parameter instruction (main frame is provided with parameter to terminal)
S--report setting value instruction (main frame requires terminal that the parameter of setting is reported, and checks with the database storing value)
C--confirms instruction (main frame sends terminal and confirms instruction)
Q--dormancy instruction (main frame requires terminal to enter the sleep mode operation)
Being exemplified below of instruction issuing message format:
(1) time command is set:
Its order format (20 of total lengths):
＜station number〉＜password〉T＜test serial number〉＜time〉＜check code〉＜the difference sign indicating number 〉
＜the time 〉: numeral, 4; HHMM
＜check code 〉: hexadecimal code, 2
＜difference sign indicating number 〉: printable character, 1
Annotate: the host monitor system needs report test value message is replied in this instruction.
Example: message is: 10001234T00010001105 is cut apart the back message information and is: test serial number: the data representation test serial number is 0001 in (0001) bracket; Time: (00:01) in the bracket data representation time is set is 01 minutes zero points; Check code: the check code that the data representation computing machine produces in (10) bracket is 10; The difference sign indicating number: the difference sign indicating number that DPS produces in (5) bracket is 5;
Wherein check code and difference sign indicating number just adopt hypothesis (by inserting after the COMPUTER CALCULATION) here;
(2) alignment time instruction:
Its order format (21 of total lengths):
＜station number〉＜password〉A＜test serial number〉＜the adjustment direction〉＜adjustment amount〉＜check code〉＜the difference sign indicating number 〉
＜adjustment direction 〉: 1 ,+the time increases;-time decreased
＜adjustment amount 〉: 4, MMSS
＜check code 〉: hexadecimal code, 2
＜difference sign indicating number 〉: printable character, 1
Annotate: the host monitor system needs report test value message is replied in this instruction.
Example: message is: 10001234A0002+0010115 is cut apart the back message information and is: test serial number: the data representation test serial number is 0002 in (0002) bracket; Adjust direction: the data representation adjustment time is for increasing in (+) bracket; Adjustment amount: data representation increases by 10 seconds in (0010) bracket, check code: the check code that the data representation computing machine produces in (11) bracket is 11; The difference sign indicating number: the difference sign indicating number that DPS produces in (5) bracket is 5;
Wherein check code and difference sign indicating number just adopt hypothesis (by inserting after the COMPUTER CALCULATION) here;
Describedly place the intracardiac trusteeship service device of mobile communication in the present embodiment, be the trusteeship service device (being a computing machine) that places the mobile communication center on the place (as Shanghai), mainly be responsible for reception, transmission and the buffer memory of the information of finishing by the functional requirement configuration; Because wireless data transmission terminal is installed in each transformer station and power plant, each transformer station and power plant all use a wireless receiving and dispatching computing machine to finish wireless data communications this will be that cost is very high.So adopt a trusteeship service device to be installed in mobile communication center, place (as Shanghai), by it be responsible for the message pick-up that each transformer station and power plant send return to store on the spot and be forwarded to each on the spot monitoring computer be the host monitor system, otherwise the instruction that the host monitor system sends is responsible for delivering to each wireless data transmission terminal by it; The host monitor system is responsible for finishing the application of every data.
The configuration of trusteeship service device in the present embodiment:
Hardware components: DELL PE 2600 servers; INTEL XEON 2.8; 4*256M DDR 200 ECC sdram memorys; 36G 15K RPM ULTRA320 SCSI hard disk * 2; 24*CD ROM EIDE; PERC4/DC RAID1; Binary channels; Integrated INTEL GIGABIT 1000M network interface card; 17 ' LCD colour display screen device; Software section: common operating system; Common communication software (transmitting-receiving of responsible SMS (Short Messaging Service), storage, forwarding etc.); Local data library software etc.
Claims (4)
1. leakage current of an arrester and action frequency real-time monitoring system, lightning arrester for ground connection, it is characterized in that comprising: contain the local monitoring means of sensor that is connected on the arrester ground line and the wireless data transmission terminal that is connected with sensor, place the intracardiac trusteeship service device of mobile communication and place the interior host monitor system of computing machine.
2. leakage current of an arrester according to claim 1 and action frequency real-time monitoring system, it is characterized in that described sensor comprises: current transducer, the high speed integrator that is connected with the current transducer output terminal, the amplification amplitude modulator that is connected with the high speed integrator output terminal, respectively with amplify signal trace follower, thunderbolt time counter and the leakage current collection device that amplitude modulator is connected, the reset signal input source that is connected with the leakage current collection device with thunderbolt time counter respectively.
3. leakage current of an arrester according to claim 1 and action frequency real-time monitoring system, it is characterized in that comprising in the described wireless data transmission terminal: data processing unit, wireless transmission unit and electric power system, wherein data processing unit comprises: isolated drive circuit, A/D modular converter and the central processing unit of mutual series connection; Wireless transmission unit comprises radio receiving transmitting module and connector; Electric power system is a solar electric power supply system.
4. leakage current of an arrester according to claim 1 and action frequency real-time monitoring system, it is characterized in that the described interior host monitor system of computing machine that places comprises: information receiving module, the message processing module that is connected with information receiving module, the database that is connected with message processing module, configuration and debugging module and display alarm module respectively.
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