CN103091575A - Operating maintenance tool on site for load monitor - Google Patents
Operating maintenance tool on site for load monitor Download PDFInfo
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- CN103091575A CN103091575A CN 201210356513 CN201210356513A CN103091575A CN 103091575 A CN103091575 A CN 103091575A CN 201210356513 CN201210356513 CN 201210356513 CN 201210356513 A CN201210356513 A CN 201210356513A CN 103091575 A CN103091575 A CN 103091575A
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- 238000012423 maintenance Methods 0.000 title claims abstract description 56
- 238000004891 communication Methods 0.000 claims abstract description 29
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Abstract
The invention provides an operating maintenance tool on site for a load monitor. The operating maintenance tool on site can be loaded on the load monitor and a handheld game console, so maintenance danger coefficient can be effectively reduced, and maintenance efficiency is improved. The operating maintenance tool on site can also be additionally mounted on the load monitor by one person when maintenance work is carried out, and other maintenance personnel carry out maintenance operation in safe places or places with work environment. The mode of a wireless communication conversion device of the operating maintenance tool on site for the load monitor enables products in old model numbers to be applied to new communication technology with ease, so cost for equipment modification and upgrading is saved. The operating maintenance tool on site for the load monitor is suitable for operating maintenance fields on site of various load monitors.
Description
Technical field
The present invention relates to a kind of maintenance tool, relate in particular to a kind of be applied to load monitor can on-the-spot operation maintenance instrument.
Background technology
Along with line loss the carrying out in a deep going way of work that become more meticulous, load monitor is popularized in an all-round way and is used in each electric company of basic unit of each electric power company of family.By gathering supply side comparing sale of electricity side information, positive effect is played in work in order in time to grasp transformer load, control desk district line loss, oppose electricity-stealing etc.
Along with 2007 in the jurisdiction rural area and 204 first generation load monitors of combination area of city and country trial run and obtain effect.Pilot work in 2008 is popularized in an all-round way and is popularized, and realizes that 100% of bar, distribution transformer load monitoring device covers.By the supply side comparing sale of electricity side information of using load monitor to gather, for control desk district line loss, accelerate to advance line loss fine-grained management work paces to play positive meaning.
And along with the extensive popularization of load monitor equipment, make the line service amount of load monitor huge, and adding many objective factors such as work under bad environment, communication signal fault, bar, load-matching monitoring instrument maintenance quantity increase gradually.And field maintemance work often needs to step on bar or enter switchgear building operation, and operating personnel's work qualification is had relevant regulation and restriction, also is subject to simultaneously the impact of the objective factors such as weather, working environment, and annual place lacks quantity up to more than 6000 time.
We find in the actual application of reality, palm machine has been used in the maintenance work of existing load measuring-recording instrument, its communication mode is generally by infrared or other wired connections, very large limitation is arranged on coverage and convenience, often still need step on bar or enter switchgear building etc. during with palm machine operation.And load monitor manufacturer or O﹠M unit operation personnel do not possess relevant electric power operation qualification, the maintenance work that causes the scene in time to process has to transport producer's maintenance back after dismounting, expend the plenty of time, manpower and financial resources, even affect user's normal electricity consumption.
Therefore the existing field maintenance tool of using in the urgent need to a kind of novel load monitor, can improve working environment, reduces danger coefficient, and the lifting by technological means, increases work efficiency and economic benefit.
Summary of the invention
development along with the communication technology, emerged now the communication mode of a variety of short-distance wireless, the coverage of these communication modes can reach 30 meters or farther, and not the recipient to etc. restriction, present load monitor and palm machine generally wouldn't be supported these communication modes, if by transformation load monitor and palm machine communication transfer agreement, just this communication technology can be used to maintenance work, the present invention passes through above-mentioned theory, designed and developed a kind of load monitor with on-the-spot operation maintenance instrument, interconnected by short-distance wireless communication technology, improve safety coefficient and the maintenance efficiency of on-the-spot operation maintenance.Communicate by letter with the load measuring-recording instrument with wireless mode, thereby judge or deal with problems, reach to save and step on the purposes such as bar operation, computation, personnel operation, of the present invention specific as follows described:
A kind of load monitor comprises the wireless communication module, metering module and the power circuit module that are mounted on the load detector with on-the-spot operation maintenance instrument:
Described wireless communication module has adopted the RF wireless communication chip ATT7022 of ADI as front end, has adopted the R8C single-chip microcomputer of auspicious Sa as communication link layer and encryption.
Adopt the computation chip ATT7022 of a slice special use to realize function of measuring.It needs the voltage sample value of ABC three-phase and the current signal sampling input of ABCN four lines to calculate.
The voltage sample passage carries out with the mode of electric resistance partial pressure, often has a series of sampling resistor to be composed in series with respect to N.For example adopt the resistance series connection of resistance and the 1.2K of 12 62K when voltage is 220V, then with the ohmically partial pressure value of 1.2K to ATT7022.The size of voltage effective value is about 0.35V.
The current sample passage with four electric current CT after connecting resistance come sample rate current to process to ATT7022, the current sampling resistor size is 20 ohm, temperature is floated and is required in 100ppm.The specification of CT is 1.5A/5mA, and establishing size of current is 6A, and the voltage swing of sampling is 6A*5mA*20/1.5A=0.4V so.
No matter be current channel or voltage channel, all requires the termination frequency overlapped-resistable filter of sampling, frequency overlapped-resistable filter is mainly that the electric capacity by the resistance of 1.2K and 10nF consists of.
Simultaneously, ATT7022 has a reference edge output, and this reference edge need to be used in the harmonic wave module.The ATT7022 normal operation need to provide the crystal oscillator of a 24.576MHZ, and it can carry out communication by spi bus and MCU1.And provide meritorious idle signal and pulse to export.
It should be noted that ATT7022 need to select 3P3W or 3P4W, can select by wire jumper 3P3W, in the time of the wire jumper short circuit, just selected 3P3W, when wire jumper disconnects, just selected 3P4W.
Described metering module comprises power circuit, metering units circuit, frequency detection circuit, harmonic management, MCU core circuit, watchdog circuit, data storage and clock circuit, impedance detection output circuit and 485 communicating circuits.
A kind of load monitor according to the present invention is with on-the-spot operation maintenance instrument, it is characterized in that: described frequency detection circuit is realized by an amplifier, three voltage sample values of ABC superpose after three times of amplifications, positive input terminal as amplifier U3A, here it should be noted that, need to connect resistance before three voltage access amplifier anodes, resistance at least have one different from other two, because if get the words of identical resistance, the ABC voltage stack result of three line four-wire systems is 0, two of AB get 10k at present, and the C item is got 100K.The reference of negative input end meets the reference voltage VREF of ATT7022 output, and wherein enlargement factor is 2M/1.2K.
In sum, the output terminal of frequency detection circuit is the saturation amplification value of positive terminal voltage.Waveform is a square wave in fact, is exactly the frequency of electrical network by the theory frequency that can know square wave of deriving.Just the frequency of electrical network can have been determined as long as this frequency detected.This design has not only realized only having the situation of a voltage, and has satisfied the situation of three-phase voltage.But prerequisite is that the frequency of three-phase voltage is identical.
A kind of load monitor according to the present invention is with on-the-spot operation maintenance instrument, it is characterized in that: described harmonic management module is specially three-phase current and three-phase voltage has six groups altogether, if this main circuit obtains the signal of the AD sampling of suitable NEC with 7022 voltage and current signal through processing, through three times of AD mouths of then giving MCU1 of amplifier amplification, with AD its signal magnitude of sampling, and carry out frequency analysis.The voltage swing on the every road of voltage channel is about 0.4V, and after 3 times of amplifications, voltage is 1.2V, and peak-to-peak value is about 3.4V, and the size of the reference voltage AVee of AD is 5V.
So when guaranteeing precision, also will ensure certain surplus.When the current channel amplifier adopts the amplification coefficient of 3 times also can guarantee the content input of fundamental current 6A and 30%, the AD of nec can identify and the saturated top of cutting not occur, and precision is enough large.The reference edge of amplifier is exported 2.5V with the reference of ATT7022.
A kind of load monitor according to the present invention is with on-the-spot operation maintenance instrument; it is characterized in that: the described power circuit module of described wireless communication module is to whole load monitor system power supply; and this power circuit module has the power supply input of three-phase four-wire system, and with over-pressure safety device.
The required supply voltages of module different in load monitor are not quite similar, so to the disparate modules power supply, must produce the voltage of different sizes.Simultaneously, guarantee when only have a phase voltage the time also can be system's normal power supply, the power supply input of wanting simultaneously to satisfy three-phase three-wire system also can be satisfied the power supply input of three-phase four-wire system, and over-voltage protecting function is arranged.
Use a kind of load monitor of the present invention to obtain following beneficial effect with on-the-spot operation maintenance instrument:
1. a kind of load monitor of the present invention has promoted maintenance work efficient with on-the-spot operation maintenance instrument;
2. a kind of load monitor of the present invention has been saved maintenance cost with on-the-spot operation maintenance instrument;
3. a kind of load monitor of the present invention improves the maintenance work safety coefficient with on-the-spot operation maintenance instrument;
4. a kind of load monitor of the present invention reduces technical difficulty, the operation threshold of maintenance work with on-the-spot operation maintenance instrument;
5. a kind of load monitor of the present invention improves the working environment of maintenance work with on-the-spot operation maintenance instrument;
6. a kind of load monitor of the present invention has ensured integrality, the continuation of supply side data metering with on-the-spot operation maintenance instrument;
7. a kind of load monitor of the present invention improves the operation management pattern with on-the-spot operation maintenance instrument, promotes the line loss work that becomes more meticulous.
Description of drawings
Fig. 1 is a kind of load monitor of the present invention with the configuration block diagram of on-the-spot operation maintenance instrument;
Fig. 2 is a kind of load monitor of the present invention with the circuit block diagram of the frequency detection circuit of on-the-spot operation maintenance instrument;
Fig. 3 is a kind of load monitor of the present invention with the schematic diagram of on-the-spot operation maintenance instrument and other equipment connections.
Embodiment
Below in conjunction with drawings and Examples, a kind of load monitor of the present invention is further described with on-the-spot operation maintenance instrument.
Embodiment
As shown in Figure 1, a kind of load monitor comprises with on-the-spot operation maintenance instrument the wireless communication module, metering module and the power circuit module that are mounted on the load detector.
Wireless communication module has adopted the RF wireless communication chip ATT7022 of ADI as front end, has adopted the R8C single-chip microcomputer of auspicious Sa as communication link layer and encryption.
Adopt the computation chip ATT7022 of a slice special use to realize function of measuring.It needs the voltage sample value of ABC three-phase and the current signal sampling input of ABCN four lines to calculate.
The voltage sample passage carries out with the mode of electric resistance partial pressure, often has a series of sampling resistor to be composed in series with respect to N.For example adopt the resistance series connection of resistance and the 1.2K of 12 62K when voltage is 220V, then with the ohmically partial pressure value of 1.2K to ATT7022.The size of voltage effective value is about 0.35V.
The current sample passage with four electric current CT after connecting resistance come sample rate current to process to ATT7022, the current sampling resistor size is 20 ohm, temperature is floated and is required in 100ppm.The specification of CT is 1.5A/5mA, and establishing size of current is 6A, and the voltage swing of sampling is 6A*5mA*20/1.5A=0.4V so.
No matter be current channel or voltage channel, all requires the termination frequency overlapped-resistable filter of sampling, frequency overlapped-resistable filter is mainly that the electric capacity by the resistance of 1.2K and 10nF consists of.
Simultaneously, ATT7022 has a reference edge output, and this reference edge need to be used in the harmonic wave module.The ATT7022 normal operation need to provide the crystal oscillator of a 24.576MHZ, and it can carry out communication by spi bus and MCU1.And provide meritorious idle signal and pulse to export.
It should be noted that ATT7022 need to select 3P3W or 3P4W, can select by wire jumper 3P3W, in the time of the wire jumper short circuit, just selected 3P3W, when wire jumper disconnects, just selected 3P4W.
In the present embodiment, property indices is:
Modulation system: 2-FSK
Frequency of operation: 470MHz
Emissive power :≤10dbm
Receiving sensitivity :-120dBm (470MHz/2400bps)
Carrier frequency error: ± 5K-25～70 ℃
Transmitter current:＜20mA is in emission state always
Received current:＜10mA is in accepting state always
Sleep current:＜5uA module enters low power consumpting state
Transmitting distance: 10 ~ 30m
Metering module comprises power circuit, metering units circuit, frequency detection circuit, harmonic management, MCU core circuit, watchdog circuit, data storage and clock circuit, impedance detection output circuit and 485 communicating circuits.
As shown in Figure 2, frequency detection circuit is realized by an amplifier, three voltage sample values of ABC superpose after three times of amplifications, and the positive input terminal as amplifier U3A here it should be noted that, need to connect resistance before three voltage access amplifier anodes, resistance at least have one different from other two, because if get identical resistance, the ABC voltage stack result of three line four-wire systems is 0, two of AB get 10k at present, and the C item is got 100K.The reference of negative input end meets the reference voltage VREF of ATT7022 output, and wherein enlargement factor is 2M/1.2K.
In sum, the output terminal of frequency detection circuit is the saturation amplification value of positive terminal voltage.Waveform is a square wave in fact, is exactly the frequency of electrical network by the theory frequency that can know square wave of deriving.Just the frequency of electrical network can have been determined as long as this frequency detected.This design has not only realized only having the situation of a voltage, and has satisfied the situation of three-phase voltage.But prerequisite is that the frequency of three-phase voltage is identical.
The harmonic management module is specially three-phase current and three-phase voltage has six groups altogether, if this main circuit obtains the signal of the AD sampling of suitable NEC with 7022 voltage and current signal through processing, amplify three times then to the AD mouths of MCU1 through amplifier, with AD its signal magnitude of sampling, and carry out frequency analysis.The voltage swing on the every road of voltage channel is about 0.4V, and after 3 times of amplifications, voltage is 1.2V, and peak-to-peak value is about 3.4V, and the size of the reference voltage AVee of AD is 5V.
So when guaranteeing precision, also will ensure certain surplus.When the current channel amplifier adopts the amplification coefficient of 3 times also can guarantee the content input of fundamental current 6A and 30%, the AD of nec can identify and the saturated top of cutting not occur, and precision is enough large.The reference edge of amplifier is exported 2.5V with the reference of ATT7022.
The described power circuit module of wireless communication module is to whole load monitor system power supply, and this power circuit module has the power supply input of three-phase four-wire system, and with over-pressure safety device.
The required supply voltages of module different in load monitor are not quite similar, so to the disparate modules power supply, must produce the voltage of different sizes.Simultaneously, guarantee when only have a phase voltage the time also can be system's normal power supply, the power supply input of wanting simultaneously to satisfy three-phase three-wire system also can be satisfied the power supply input of three-phase four-wire system, and over-voltage protecting function is arranged.
As shown in Figure 3, generally speaking, a kind of load monitor of the present invention can be carried on load monitor and palm machine with on-the-spot operation maintenance instrument, can greatly reduce and safeguard danger coefficient, improves maintenance efficiency.Also can install this equipment additional by a people on load monitor when maintenance work, other maintainers carry out attended operation in the place of safety or good work environment.And a kind of load monitor of the present invention can make the product of old type tube easily be applied to the new communication technology with the pattern of the wireless communication conversion device of on-the-spot operation maintenance instrument, saved the expense of scrap build, update.A kind of load monitor of the present invention is applicable to operation maintenance field, various load monitors scene with on-the-spot operation maintenance instrument.
Claims (4)
1. a load monitor with on-the-spot operation maintenance instrument, comprises the wireless communication module, metering module and the power circuit module that are mounted on the load detector:
Described wireless communication module has adopted the RF wireless communication chip ATT7022 of ADI as front end, has adopted the R8C single-chip microcomputer of auspicious Sa as communication link layer and encryption;
Described metering module comprises power circuit, metering units circuit, frequency detection circuit, harmonic management module, MCU core circuit, watchdog circuit, data storage and clock circuit, impedance detection output circuit and 485 communicating circuits.
2. a kind of load monitor as claimed in claim 1 is with on-the-spot operation maintenance instrument, it is characterized in that: described frequency detection circuit is realized by an amplifier, three voltage sample values of ABC superpose after three times of amplifications, positive input terminal as amplifier U3A, here it should be noted that, need to connect resistance before three voltage access amplifier anodes, resistance at least have one different from other two, because if get the words of identical resistance, the ABC voltage stack result of three line four-wire systems is 0, two of AB get 10k at present, and the C item is got 100K.The reference of negative input end meets the reference voltage VREF of ATT7022 output, and wherein enlargement factor is 2M/1.2K.
3. a kind of load monitor as claimed in claim 4 is with on-the-spot operation maintenance instrument, it is characterized in that: described harmonic management module is specially three-phase current and three-phase voltage has six groups altogether, if this main circuit obtains the signal of the AD sampling of suitable NEC with 7022 voltage and current signal through processing, through three times of AD mouths of then giving MCU1 of amplifier amplification, with AD its signal magnitude of sampling, and carry out frequency analysis.The voltage swing on the every road of voltage channel is about 0.4V, and after 3 times of amplifications, voltage is 1.2V, and peak-to-peak value is about 3.4V, and the size of the reference voltage AVee of AD is 5V.
4. a kind of load monitor as claimed in claim 1 is with on-the-spot operation maintenance instrument; it is characterized in that: described power circuit module is to whole load monitor system power supply; and this power circuit module has the power supply input of three-phase four-wire system, and with over-pressure safety device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210356513 CN103091575A (en) | 2012-09-21 | 2012-09-21 | Operating maintenance tool on site for load monitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210356513 CN103091575A (en) | 2012-09-21 | 2012-09-21 | Operating maintenance tool on site for load monitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400305A (en) * | 2013-07-19 | 2013-11-20 | 国家电网公司 | Analysis and vacancy processing method for unreasonable-line-loss distribution room |
| CN104749469A (en) * | 2015-04-08 | 2015-07-01 | 国家电网公司 | Circuit line loss comprehensive monitoring device |
-
2012
- 2012-09-21 CN CN 201210356513 patent/CN103091575A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400305A (en) * | 2013-07-19 | 2013-11-20 | 国家电网公司 | Analysis and vacancy processing method for unreasonable-line-loss distribution room |
| CN104749469A (en) * | 2015-04-08 | 2015-07-01 | 国家电网公司 | Circuit line loss comprehensive monitoring device |
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Application publication date: 20130508 |