CN106199098A - Under ammeter power-down state, low-power consumption during electrical network full decompression exception detects control method - Google Patents
Under ammeter power-down state, low-power consumption during electrical network full decompression exception detects control method Download PDFInfo
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- CN106199098A CN106199098A CN201610477701.3A CN201610477701A CN106199098A CN 106199098 A CN106199098 A CN 106199098A CN 201610477701 A CN201610477701 A CN 201610477701A CN 106199098 A CN106199098 A CN 106199098A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
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Abstract
The invention discloses low-power consumption detection control method during electrical network full decompression exception under ammeter power-down state, relate to ammeter technical field, when the ammeter of the method is operated in battery mode, ammeter can be allowed to carry out the full decompression record current detection of low-power consumption according to setting current detecting frequency.Including computation chip and the master chip that is connected with computation chip, when ammeter is operated under battery mode, master chip controls the current detecting frequency of computation chip according to the time interval to load current detection pre-set；The threshold value whether being reached threshold by current threshold comparator detection load electric current judges whether ammeter occurs full decompression；If it occur that full decompression, then triggered an interrupt signal to master chip by current threshold comparator, after master chip receives interrupt signal, master chip is to computation chip signal, open computation chip immediately to be switched to amperometric detection mode from park mode and carry out full decompression record, be otherwise not turned on the amperometric detection mode of computation chip.
Description
Technical field
The present invention relates to ammeter technical field, be specifically related to low-power consumption during electrical network full decompression exception under ammeter power-down state
Detection control method.
Background technology
The full decompression writing function of ammeter, is the most frequently used practical event recording function of one of ammeter, is to be lost by complete
The electricity to be remedied that is recorded as of pressure event provides electric quantity compensating foundation accurately, it is to avoid because electric quantity compensating causes according to lacking two
Power supply and the dispute of electricity consumption both sides.The full decompression detection of ammeter is divided into normal operating conditions detection and power-down state to detect.Wherein,
The power-down state detection of ammeter needs cell powers, the lasting detection of power-down state detection can consume substantial amounts of battery electricity
Amount, consequently, it is possible to influence whether the length detecting the time and the service life of battery that ammeter power-down state detect.
Still meter is persistently opened by normal operating conditions method when existing ammeter works under the battery mode of power-down state
Amount chip carries out sample detecting to load current, so can consume the big volume and electricity of battery, and energy consumption consumes fast, can make the electricity of battery
Amount runs out within a short period of time, thus affects other functions of ammeter detection, the most also can affect the service life of battery.
Summary of the invention
The present invention is to there is above-mentioned deficiency to solve existing ammeter, it is provided that a kind of ammeter is operated in battery mode
Time, ammeter can be allowed to carry out the full decompression record current detection of low-power consumption according to the current detecting frequency set, power consumption is low, electricity
Pond is long for service life, and under the ammeter power-down state that reliability is high, low-power consumption during electrical network full decompression exception detects control method.
More than technical problem is that and to be solved by following technical proposal:
Under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, including computation chip and with meter
The master chip that amount chip connects, described computation chip includes normal mode, partly detection pattern, amperometric detection mode and dormancy mould
Formula, control method comprises the steps:
When ammeter is operated under battery mode, master chip is according to the time interval to load current detection pre-set
Control the current detecting frequency of computation chip；
The threshold value whether being reached threshold by current threshold comparator detection load electric current judges whether ammeter is sent out
Raw full decompression；
If it occur that full decompression, then triggered an interrupt signal by current threshold comparator and receive to master chip, master chip
After interrupt signal, master chip, to computation chip signal, is opened computation chip immediately and is switched to current detecting mould from park mode
Formula carries out full decompression record, is otherwise not turned on the amperometric detection mode of computation chip.
When this programme ammeter is operated in battery mode, ammeter can be allowed to carry out low-power consumption according to the current detecting frequency set
Full decompression record current detection, power consumption is low, and battery is long, and reliability is high, it is achieved that ammeter is complete at battery mode
Low-power consumption detection during decompression exception, realizes full decompression under battery mode for ammeter and detects the most for a long time and provide possibility.
The reduction of battery power consumption means the prolongation of service time of battery, also saves because changing the cost that battery causes, has higher
Technology and economic worth.
As preferably, when computation chip does not detects, by master chip control, computation chip is made to be operated in least in power-consuming
Under park mode, then according to the time interval set wakes up computation chip up and is switched to amperometric detection mode from park mode
Under；Under amperometric detection mode, current threshold good with school in advance for three-phase load electric current is compared by computation chip, if having in threshold value
Above split-phase load current, then can trigger the interrupt output end of computation chip and output low level, thus decide whether to open
The amperometric detection mode of computation chip carries out full decompression record.
As preferably, computation chip is switched to amperometric detection mode from park mode and carries out the process of full decompression record such as
Under: start, wake up computation chip up to amperometric detection mode every the setting time, then judge whether load current exceedes threshold value；
If load current is not above threshold value, then illustrate, currently without there is full decompression, to read last time generation simultaneously
Full decompression；Then the state whether phase of the state currently without the full decompression occurred and the last full decompression occurred is judged
With？
If the state currently without the full decompression occurred is identical with the state of the last full decompression occurred, the most directly will
Computation chip is switched to park mode；
If differed currently without the state of the full decompression occurred and the state of the last full decompression occurred, then will meter
Amount chip is switched to normal mode, the state currently without the full decompression occurred carries out record, and terminates last generation
The state recording of full decompression, is updated to full decompression Status Flag by full decompression Status Flag simultaneously, and simultaneously by threshold value
Lower limit write threshold register, is switched to park mode by computation chip the most again；
If load current alreadys more than threshold value, then currently there is full decompression in explanation, reads last time generation simultaneously
Full decompression；Then the state whether phase of the state of current occurent full decompression and the last full decompression occurred is judged
With？
If the state of current occurent full decompression is identical with the state of the last full decompression occurred, the most directly will
Computation chip is switched to park mode；
If the state of the state of current occurent full decompression and the last full decompression occurred differs, then will meter
Amount chip is switched to normal mode, the state of current occurent full decompression is carried out record, and terminates last generation
The state recording of full decompression, is updated to full decompression Status Flag by full decompression Status Flag simultaneously, and simultaneously by threshold value
Upper limit write threshold register, is switched to park mode by computation chip the most again；
After computation chip is switched to park mode state, return to beginning state further according to the time interval set, as
This amperometric detection mode back and forth restarting the most whether to open computation chip carries out full decompression record next time.
As preferably, in order to full decompression is not missed, then need to preset two threshold values of threshold, i.e. in threshold value
Limit and bottom threshold；Judge then to use when full decompression starts bottom threshold, it is judged that at the end of full decompression, then use upper threshold.
As preferably, described computation chip includes pattern pin PM1 and pattern pin PM0, and is controlled normal by master chip
Pattern, part detection pattern, switching between amperometric detection mode and park mode.
As preferably, also include the comparison circuit of low-power consumption, and by comparison circuit to the threshold value under amperometric detection mode
Verifying, current detecting is realized by comparison circuit, and when foreign current is less than the threshold value set, comparison circuit exports low electricity
Flat；When foreign current is more than when setting threshold value, then export high level.
As preferably, current threshold comparator has six, and these six current threshold comparators are respectively used to three-phase electricity
Forward current and the detection of negative current, and these six current threshold comparators are respectively with each self-corresponding current detecting control bit
Control the opening and closing of respective current threshold comparator；The current detection threshold of each current threshold comparator is by respective
Threshold register is arranged.
As preferably, the current detection threshold of current threshold comparator is come by the threshold register of this current threshold comparator
Arranging, if the current detection threshold scope of current threshold comparator is H1-H2, presetting standard source output needs the electricity of detection
Signal, and the bottom threshold of the current detection threshold scope of current threshold comparator is H1, if the electric current of current threshold comparator
The upper threshold of detection threshold range is H2, if the value limiting between H1 and upper threshold H2 under the threshold value that falls is variable H；And
Bottom threshold H1, upper threshold H2 and variable H are stored in threshold register in the lump；
When comparison circuit output high level, it is judged that H2-H, whether equal to 1, if H2-H is equal to 1, then detects current threshold
It is equal to H, then terminates calibration detection；If H2-H is not equal to 1, then allow H1=H, and calculate new H=(H2+H1) ÷ 2, so
After the variable H-number that this is new is assigned to threshold register；
When comparison circuit output low level, it is judged that H-H1, whether equal to 1, if H-H1 is equal to 1, then detects current threshold
It is equal to H1, then terminates calibration detection；If H-H1 is not equal to 1, then allow H2=H, and calculate new H=(H2+H1) ÷ 2,
Then the variable H-number that this is new is assigned to threshold register；
Then the low and high level signal of comparison circuit output is controlled by variable H-number new in threshold register.
The present invention can reach following effect:
When ammeter of the present invention is operated in battery mode, ammeter can be allowed to carry out low-power consumption according to the current detecting frequency set
Full decompression record current detection, power consumption is low, and battery is long, and reliability is high, it is achieved that ammeter is complete at battery mode
Low-power consumption detection during decompression exception, realizes full decompression under battery mode for ammeter and detects the most for a long time and provide possibility.
The reduction of battery power consumption means the prolongation of service time of battery, also saves because changing the cost that battery causes, has higher
Technology and economic worth.
Accompanying drawing explanation
Fig. 1 is that a kind of normal mode of operation whether opening computation chip of the present invention carries out the signal of full decompression record flow process
Figure.
Fig. 2 is the calibration schematic flow sheet of a kind of current detection threshold of the present invention.
Detailed description of the invention
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
Embodiment, under ammeter power-down state, low-power consumption during electrical network full decompression exception detects control method, including metering core
Sheet and the master chip being connected with computation chip, described computation chip includes normal mode, partly detection pattern, amperometric detection mode
And park mode.Control method comprises the steps:
When ammeter is operated under battery mode, master chip is according to the time interval to load current detection pre-set
Control the current detecting frequency of computation chip.Whether threshold is reached by current threshold comparator detection load electric current
Threshold value judges whether ammeter occurs full decompression.If it occur that full decompression, then triggered interruption by current threshold comparator
Signal is to master chip, and after master chip receives interrupt signal, master chip, to computation chip signal, opens computation chip immediately from dormancy
Pattern is switched to amperometric detection mode and carries out full decompression record, is otherwise not turned on the amperometric detection mode of computation chip.
When computation chip does not detects, by master chip control, computation chip is made to be operated in park mode least in power-consuming
Under, then according to the time interval set wakes up computation chip up and is switched under amperometric detection mode from park mode.At electric current
Under detection pattern, current threshold good with school in advance for three-phase load electric current is compared by computation chip, if there being the split-phase more than threshold value
Load current, then can trigger the interrupt output end of computation chip and output low level, thus decide whether to open computation chip
Amperometric detection mode carries out full decompression record.
Shown in Figure 1, computation chip is switched to amperometric detection mode from park mode and carries out the process of full decompression record
As follows: to start, wake up computation chip up to amperometric detection mode every the setting time, then judge whether load current exceedes threshold
Value.
If load current is not above threshold value, then illustrate, currently without there is full decompression, to read last time generation simultaneously
Full decompression.Then the state whether phase of the state currently without the full decompression occurred and the last full decompression occurred is judged
With？
If the state currently without the full decompression occurred is identical with the state of the last full decompression occurred, the most directly will
Computation chip is switched to park mode.
If differed currently without the state of the full decompression occurred and the state of the last full decompression occurred, then will meter
Amount chip is switched to normal mode, the state currently without the full decompression occurred carries out record, and terminates last generation
The state recording of full decompression, is updated to full decompression Status Flag by full decompression Status Flag simultaneously, and simultaneously by threshold value
Lower limit write threshold register, is switched to park mode by computation chip the most again.
If load current alreadys more than threshold value, then currently there is full decompression in explanation, reads last time generation simultaneously
Full decompression.Then the state whether phase of the state of current occurent full decompression and the last full decompression occurred is judged
With？
If the state of current occurent full decompression is identical with the state of the last full decompression occurred, the most directly will
Computation chip is switched to park mode.
If the state of the state of current occurent full decompression and the last full decompression occurred differs, then will meter
Amount chip is switched to normal mode, the state of current occurent full decompression is carried out record, and terminates last generation
The state recording of full decompression, is updated to full decompression Status Flag by full decompression Status Flag simultaneously, and simultaneously by threshold value
Upper limit write threshold register, is switched to park mode by computation chip the most again.
After computation chip is switched to park mode state, return to beginning state further according to the time interval set, as
This amperometric detection mode back and forth restarting the most whether to open computation chip carries out full decompression record next time.
In order to full decompression is not missed, then need to preset two threshold values of threshold, i.e. upper threshold and threshold value
Lower limit.Judge then to use when full decompression starts bottom threshold, it is judged that at the end of full decompression, then use upper threshold.
Described computation chip includes pattern pin PM1 and pattern pin PM0, and is controlled normal mode, part by master chip
Switching between detection pattern, amperometric detection mode and park mode.During normal mode, the electric current of computation chip job demand is
13mA.During part detection pattern, the electric current of computation chip job demand is 7mA.Computation chip job demand during amperometric detection mode
Electric current unidirectional for 200uA, two-way for 100uA.During park mode, the electric current of computation chip job demand is 1uA.
Also include the comparison circuit of low-power consumption, and by comparison circuit, the threshold value under amperometric detection mode verified,
Current detecting is realized by comparison circuit, when foreign current is less than the threshold value set, and comparison circuit output low level.Work as external electrical
Stream more than when setting threshold value, then exports high level.
Current threshold comparator has six, these six current threshold comparators be respectively used to three-phase electricity forward current and
The detection of negative current, and these six current threshold comparators control each with each self-corresponding current detecting control bit respectively
The opening and closing of current threshold comparator.The current detection threshold of each current threshold comparator is by respective threshold register
Arrange.
Shown in Figure 2, the current detection threshold of current threshold comparator is deposited by the threshold value of this current threshold comparator
Device is arranged, if the current detection threshold scope of current threshold comparator is H1-H2, presetting standard source output needs detection
The signal of telecommunication, and set the bottom threshold of current detection threshold scope of current threshold comparator as H1, if current threshold comparator
The upper threshold of current detection threshold scope be H2, if a value between the limit H1 and upper threshold H2 under the threshold value of falling is change
Amount H.And bottom threshold 111, upper threshold H2 and variable H are stored in threshold register in the lump.
When comparison circuit output high level, it is judged that H2-H, whether equal to 1, if H2-H is equal to 1, then detects current threshold
It is equal to H, then terminates calibration detection.If H2-H is not equal to 1, then allow H1=H, and calculate new H=(H2+H1) ÷ 2, so
After the variable H-number that this is new is assigned to threshold register.
When comparison circuit output low level, it is judged that H-H1, whether equal to 1, if H-H1 is equal to 1, then detects current threshold
It is equal to H1, then terminates calibration detection.If H-H1 is not equal to 1, then allow H2=H, and calculate new H=(H2+H1) ÷ 2,
Then the variable H-number that this is new is assigned to threshold register.
Then the low and high level signal of comparison circuit output is controlled by variable H-number new in threshold register.
H1=2mVrms in this example, H2=4mVrms.
Carry out the detection functional verification of full decompression below
In order to ensure the reliability of invention, need to be tested by reality to verify.The present embodiment prepares when checking
3 ammeters are verified in all cases.Accurate according to state's network mark, full decompression generation termination condition is:
Cumulative time is with 1 minute for minimum time unit.
Occurrence condition is: maximum phase voltage<critical voltage threshold values (60%Un), and load current>(5%Ib), Δ t>
(60s)。
Termination condition is: maximum phase voltage >=critical voltage threshold values (60%Un) or load current≤(5%Ib), Δ t >
(60s)。
According to there is termination condition, test result is as shown in table 1:
Table 1: full decompression test data
Carry out power consumption calculation and contrast below
Describe according to table 1, below we respectively power consumption to two kinds of full decompression detection methods do and substantially calculate and contrast.
Assume that 50s detects once, it is considered to reliably detecting, the Sample Establishing time of amperometric detection mode is loosened to from 32ms
50ms, and there is not full decompression, computation chip average power consumption electric current is as follows.
Common detection methods-:
(50 (s) * 1 (uA)+0.05 (s) * 13000 (uA))/50.05 (s)=13.986 (uA)
Reducing power consumption detection method two:
(50 (s) * 1 (uA)+0.05 (s) * 200 (uA))/50.05 (s)=1.1988 (uA)
Visible, use method two power consumption almost to only have original 8.57%, lower power consumption is clearly.
When the present embodiment ammeter is operated in battery mode, ammeter can be allowed to carry out low-power consumption according to the current detecting frequency set
The detection of full decompression record current, power consumption is low, and battery is long, and reliability is high, it is achieved that ammeter is at battery mode
Low-power consumption detection during full decompression exception, realizes full decompression under battery mode for ammeter and detects that provide can the most for a long time
Energy.The reduction of battery power consumption means the prolongation of service time of battery, also saves because changing the cost that battery causes, has relatively
High technology and economic worth.
Describe embodiments of the present invention above in conjunction with accompanying drawing, but do not limited by above-described embodiment when realizing, this area
Those of ordinary skill can make a variety of changes within the scope of the appended claims or revise.
Claims (7)
1. under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, it is characterised in that include metering
Chip and the master chip being connected with computation chip, described computation chip includes normal mode, partly detection pattern, current detecting mould
Formula and park mode, control method comprises the steps:
When ammeter is operated under battery mode, master chip is controlled according to the time interval to load current detection pre-set
The current detecting frequency of computation chip processed；
The threshold value whether being reached threshold by current threshold comparator detection load electric current judges whether ammeter occurs entirely
Decompression；
If it occur that full decompression, then triggered interrupt signal to master chip by current threshold comparator, during master chip receives
After break signal, master chip, to computation chip signal, is opened computation chip immediately and is switched to amperometric detection mode from park mode and enters
The full decompression record of row, is otherwise not turned on the amperometric detection mode of computation chip.
The most according to claim 1 under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, its
It is characterised by, when computation chip does not detects, by master chip control, makes computation chip be operated in park mode least in power-consuming
Under, then according to the time interval set wakes up computation chip up and is switched under amperometric detection mode from park mode；At electric current
Under detection pattern, current threshold good with school in advance for three-phase load electric current is compared by computation chip, if there being the split-phase more than threshold value
Load current, then can trigger the interrupt output end of computation chip and output low level, thus decide whether to open computation chip
Amperometric detection mode carries out full decompression record.
The most according to claim 1 under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, its
Being characterised by, computation chip is switched to amperometric detection mode from park mode, and to carry out the process of full decompression record as follows: from the beginning of, often
Wake up computation chip up to amperometric detection mode every the setting time, then judge whether load current exceedes threshold value；
If load current is not above threshold value, then illustrate, currently without there is full decompression, to read the complete of last time generation simultaneously
Decompression；Then judge that the state currently without the full decompression occurred is the most identical with the state of the last full decompression occurred？
If the state currently without the full decompression occurred is identical with the state of the last full decompression occurred, the most directly will metering
Chip is switched to park mode；
If differed, then by metering core currently without the state of the full decompression occurred and the state of the last full decompression occurred
Sheet is switched to normal mode, the state currently without the full decompression occurred carries out record, and terminates the full mistake of last generation
The state recording of pressure, is updated to full decompression Status Flag by full decompression Status Flag simultaneously, and simultaneously by bottom threshold
Write threshold register, is switched to park mode by computation chip the most again；
If load current alreadys more than threshold value, then currently there is full decompression in explanation, reads the complete of last time generation simultaneously
Decompression；Then judge that the state of current occurent full decompression is the most identical with the state of the last full decompression occurred？
If the state of current occurent full decompression is identical with the state of the last full decompression occurred, the most directly will metering
Chip is switched to park mode；
If the state of the state of current occurent full decompression and the last full decompression occurred differs, then by metering core
Sheet is switched to normal mode, the state of current occurent full decompression is carried out record, and terminates the full mistake of last generation
The state recording of pressure, is updated to full decompression Status Flag by full decompression Status Flag simultaneously, and simultaneously by upper threshold
Write threshold register, is switched to park mode by computation chip the most again；
After computation chip is switched to park mode state, return to beginning state further according to the time interval set, the most past
The multiple amperometric detection mode restarting the most whether to open computation chip carries out full decompression record next time.
The most according to claim 1 under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, its
It is characterised by, in order to full decompression is not missed, then needs to preset two threshold values of threshold, i.e. upper threshold and threshold value
Lower limit；Judge then to use when full decompression starts bottom threshold, it is judged that at the end of full decompression, then use upper threshold.
The most according to claim 1 under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, its
It is characterised by, also includes the comparison circuit of low-power consumption, and by comparison circuit, the threshold value under amperometric detection mode is verified,
Current detecting is realized by comparison circuit, when foreign current is less than the threshold value set, and comparison circuit output low level；Work as external electrical
Stream more than when setting threshold value, then exports high level.
The most according to claim 1 under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, its
Being characterised by, current threshold comparator has six, and these six current threshold comparators are respectively used to the forward current of three-phase electricity
With the detection of negative current, and these six current threshold comparators control respectively with each self-corresponding current detecting control bit respectively
Opening and closing from current threshold comparator；The current detection threshold of each current threshold comparator is deposited by respective threshold value
Device is arranged.
The most according to claim 1 under ammeter power-down state during electrical network full decompression exception low-power consumption detection control method, its
Being characterised by, the current detection threshold of current threshold comparator is arranged by the threshold register of this current threshold comparator, if
The current detection threshold scope of current threshold comparator is H1-H2, and presetting standard source output needs the signal of telecommunication of detection, and
If the bottom threshold of the current detection threshold scope of current threshold comparator is H1, if the current detecting threshold of current threshold comparator
The upper threshold of value scope is H2, if the value limiting between H1 and upper threshold H2 under the threshold value that falls is variable H；And by threshold value
Lower limit H1, upper threshold H2 and variable H store in threshold register in the lump；
When comparison circuit output high level, it is judged that whether H2-H is equal to 1, if H2-H is equal to 1, then detection current threshold is just etc.
In H, then terminate calibration detection；If H2-H is not equal to 1, then allow H1=H, and calculate new H=(H2+H1) ÷ 2, then will
This new variable H-number is assigned to threshold register；
When comparison circuit output low level, it is judged that whether H-H1 is equal to 1, if H-H1 is equal to 1, then detection current threshold is just etc.
In H1, then terminate calibration detection；If H-H1 is not equal to 1, then allow H2=H, and calculate new H=(H2+H1) ÷ 2, then
The variable H-number that this is new is assigned to threshold register；
Then the low and high level signal of comparison circuit output is controlled by variable H-number new in threshold register.
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| CN106899453A (en) * | 2017-03-02 | 2017-06-27 | 北京星网锐捷网络技术有限公司 | The detection method and device of power supply adaptor failure |
| CN108008340A (en) * | 2017-09-28 | 2018-05-08 | 国网重庆市电力公司电力科学研究院 | A kind of radio energy table power consumption test system |
| CN108333398A (en) * | 2018-01-18 | 2018-07-27 | 研耀（上海）信息科技有限公司 | A kind of high energy saving electric meter |
| CN112946562A (en) * | 2021-02-07 | 2021-06-11 | 南方电网数字电网研究院有限公司 | Power failure protection method and device for double-core intelligent electric meter and double-core intelligent electric meter |
| CN113466519A (en) * | 2021-06-18 | 2021-10-01 | 深圳市思达仪表有限公司 | Anti-theft electricity processing mechanism of high-efficiency meter |
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