CN204008846U - A kind of transformer station primary and secondary table maximum demand synchronous measurement device - Google Patents
A kind of transformer station primary and secondary table maximum demand synchronous measurement device Download PDFInfo
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Abstract
The utility model provides a kind of transformer station primary and secondary table maximum demand synchronous measurement device; between transformer station's metering matrix and metering sublist; comprise metering module; synchronization module and protection module; metering module is positioned on transformer station's matrix measuring screen; synchronization module is connected with metering module respectively with protection module; metering module comprises phase three-wire three or three-phase and four-line electric multi-functional electric energy meter; metering module is realized externally transmission by RS232 channel, and synchronization module comprises high-precise synchronization current transformer.The improvement of the utility model by common electric energy meter, current transformer be used in conjunction with, can successfully solve that son, matrix current transformer ratio are inconsistent, current vector stack cover subtracts and change a difficult problem, realize the accurate-metering of antithetical phrase, matrix charging load maximum demand, effectively improve power supply measuring accuracy, reduce electric quantity loss, ensure the benefit of client, improved the economic benefit of electric power enterprise.
Description
Technical field
The utility model relates to transformer station's electric quantity metering technical field, relates in particular to a kind of transformer station primary and secondary table maximum demand synchronous measurement device.
Background technology
Electric energy metrical is the important component part of electrical network economy, stable operation, is the important step that electrical production is sold.The accuracy of electric energy metrical, reliability are subject to the consistent attention of power supply enterprise, are also directly connected to user's immediate interest.General electric company takes by transformer capacity and two kinds of ways of maximum demand for the basic charge as per installed capacity metering of large-scale industrial enterprise.For encouraging user to control a day peak load, for there being the user of impact load in short-term, generally adopt the latter, its object is peak clipping, for reducing peak-valley difference, level and smooth electricity consumption curve, power plant for energy conservation, guarantee power grid security, is economical and effective means.
But, in order to optimize and combine electric power resource, press maximum demand metering for some, but the not high user of plant factor, on outlet metering matrix, tend to be incorporated to the sublist of multiple enterprises, like this, asynchronous due to what produce between enterprise, the time that its maximum demand occurs also can not be just the same, will cause the inaccurate of overall matrix metering, cause electricity consumption dispute.Application number is that 201310497297.2 utility model patent discloses the straight power purchase client's maximum demand of a kind of multiple feed acquisition system, include measuring apparatus, station harvester, main station system, the precision of the ammeter of described measuring apparatus is 0.2S rank, according to the density of one minute, can preserve the electric degree load curve of at least 1 month, and can outwards provide with the passage of RS485 the electric energy meter of data, described electric energy meter is arranged on the stoichiometric point between large user and electrical network, although the straight power purchase client's maximum demand of the utility model multiple feed acquisition system is workable, good reliability, but for the matrix transformation of medium and small sized substation, its complex structure, operation is higher with maintenance cost, and be not suitable for promoting.
Utility model content
The utility model provides a kind of transformer station primary and secondary table maximum demand synchronous measurement device, the improvement of this device by common electric energy meter, current transformer be used in conjunction with, can successfully solve that son, matrix current transformer ratio are inconsistent, current vector stack cover subtracts and change a difficult problem, realize the load accurate-metering of maximum demand of antithetical phrase, matrix charging.
For achieving the above object; technical solution adopted in the utility model is: a kind of transformer station primary and secondary table maximum demand synchronous measurement device; between transformer station's metering matrix and metering sublist; comprise metering module; synchronization module and protection module; described metering module is positioned on transformer station's matrix measuring screen, and described synchronization module is connected with metering module respectively with protection module.
Described metering module comprises phase three-wire three or three-phase and four-line electric multi-functional electric energy meter.
Described metering module is realized externally transmission by RS232 channel.
Described synchronization module comprises high-precise synchronization current transformer, and its no-load voltage ratio value is the ratio of metering matrix and the no-load voltage ratio value of sublist.
Described synchronizing current mutual inductor is 2.
Described protection module comprises protective current mutual inductor and punching winding.
Consistent with the current transformer quantity in described protection module in described synchronization module.
The installation of this utility model and using method, comprise the following steps:
1) on transformer station's female change measuring screen, one or more sub-metering electric energy meters are set, require through mutual inductor, and can measure electric weight and requirement simultaneously;
2) between each sub-metering electric energy meter and main transformer matrix, synchronizing current mutual inductor is set, makes son, matrix no-load voltage ratio synchronous;
3) protective current mutual inductor is matched as protection module with punching winding, the major-minor side no-load voltage ratio of its mutual inductor is consistent;
4), between each sub-metering electric energy meter, access protection module, prevents short circuit between mutual inductor;
5) carry out sublist electric quantity metering, synchronizing current mutual inductor is introduced, and between son, matrix, no-load voltage ratio is got comprehensive no-load voltage ratio, current value stack;
6) due to protection module and synchronizing current mutual inductor, each sublist realizes point other electric energy metrical, maximum demand is fed back to matrix simultaneously, obtains son, matrix continuous data comparatively accurately.
Metering module in the utility model adopts phase three-wire three electric multi-functional electric energy meter, precision adopts 0.2S level or 0.5S level, ensure to match with the level accuracy of original son, matrix, adopt the special metering IC or high-precision A/D and high-speed dsp chip, measure two-way meritorious and four-quadrant reactive energy, there is the measurement functions such as voltage, electric current, power, power factor, show and adopt the highly reliable high-performance giant-screen LCD display backlight of being with, shell adopts modular design, sound construction.Adopt high stable, low-power consumption, there is the superhigh precision real-time clock of real-time temperature compensation, can guarantee that in physical environment next year, real-time clock error is less than 2 minutes.In the utility model; metering module can measure four rate forwards and oppositely meritorious, forward and reverse idle maximum demand and time of origin thereof; measure in real time a point phase voltage, electric current, active power, reactive power, power factor. total active power, total reactive power, total power factor; frequency; metering module also can be equipped with infrared and RS232, RS485 communication interface simultaneously; communication interface adopts independent current source power supply, and has electrostatic prevention and surge protection circuit.
For design with realize convenient, synchronizing current mutual inductor and protective current mutual inductor, can select the mutual inductor type with accuracy class on year-on-year basis, the no-load voltage ratio of synchronizing current mutual inductor and female amassing of no-load voltage ratio that becomes metering mutual inductor, be the no-load voltage ratio value of sub-time-dependent current mutual inductor, for ensureing the accuracy of measuring, 2 of general employings are one group, and protective current mutual inductor fundamental purpose is to realize the stack of secondary current, do not cause sublist mutual inductor short circuit to occur with synchronizeing between mutual inductor, object does not lie in change size of current, so can adopt the design of major-minor side with no-load voltage ratio, make the no-load voltage ratio of major-minor side identical by the Overlay of punching winding, reach isolation but do not change the protection object of size of current.
Maximum demand is carried out in power supply department metering, mainly from the viewpoint of two: the first increases income of electricity charge, its two be regulate power load, so the beneficial effects of the utility model are mainly reflected in: the one, realize antithetical phrase, the accurate-metering of matrix charging load maximum demand, and then effectively solve the dispute of associated electrical expense, for example, to carrying out the user of two-shift system electricity price, former basic charge as per installed capacity is the calculation of capacity by transformer, the basic charge as per installed capacity fee-collection standard difference of each department, the computing method of corresponding calculating maximum demand are also different, when user has large equipment to start or load adjustment when unfavorable, there will be indivedual periods, or the active power of saying a certain moment reaches maximal value, at this moment will be by this maximum value calculation basic charge as per installed capacity, and accomplish the separation of the access user metering of same main transformer, can in the light of actual conditions carry out classification defines, for good service work is contributed, the 2nd, be conducive to promote the equilibrating of load, be conducive to improve grid equipment utilization factor, due to the metering of the classification electricity charge, will certainly cause the larger drop of charge, the user who strengthens for expenditure, can make it increase " peak that disappears adds paddy ", the consciousness of " balanced load ", initiatively carry out renovation of production process, the load of each electricity consumption side is all tended to be steady, and then whole system is tended to be steady, electric power system also just need not too much be considered and reserved margin capacity, thereby the utilization factor of whole grid equipment is improved.
Brief description of the drawings
Fig. 1 is the structure principle chart of the utility model device.
Fig. 2 is the measuring principle figure of embodiment mono-conventional metered dose pattern.
Fig. 3 is that embodiment mono-applies the measuring principle figure after the utility model.
embodiment
As shown in Figure 1, a kind of transformer station primary and secondary table maximum demand synchronous measurement device, between transformer station's metering matrix 1 and metering sublist 2, comprise metering module 6, synchronization module 5 and protection module 4, metering module 6 is positioned on transformer station's matrix measuring screen, and synchronization module 5 is connected with metering module 6 respectively with protection module 4, metering module 6 comprises phase three-wire three electric multi-functional electric energy meter, can realize externally transmission by RS232 channel; Synchronization module 5 comprises high-precise synchronization current transformer, and its no-load voltage ratio value is the ratio of metering matrix and the no-load voltage ratio value of sublist; Protection module 4 comprises protective current mutual inductor 7 and punching winding 3; Current transformer in synchronization module is consistent with the current transformer quantity in protection module.
The installation of this utility model and using method, comprise the following steps:
1) on transformer station's female change measuring screen, one or more sub-metering electric energy meters are set, require through mutual inductor, and can measure electric weight and requirement simultaneously;
2) between each sub-metering electric energy meter and main transformer matrix, synchronizing current mutual inductor is set, makes son, matrix no-load voltage ratio synchronous;
3) protective current mutual inductor is matched as protection module with punching winding, the major-minor side no-load voltage ratio of its mutual inductor is consistent;
4), between each sub-metering electric energy meter, access protection module, prevents short circuit between mutual inductor;
5) carry out sublist electric quantity metering, synchronizing current mutual inductor is introduced, and between son, matrix, no-load voltage ratio is got comprehensive no-load voltage ratio, current value stack;
6) due to protection module and synchronizing current mutual inductor, each sublist realizes point other electric energy metrical, maximum demand is fed back to matrix simultaneously, obtains son, matrix continuous data comparatively accurately.
Embodiment mono-
As shown in Figure 2 and Figure 3, taking the A transformer station in somewhere as example, its bus total load 6KV all derives from A factory, due to A Chang Shi military enterprise, produce unstable, so, if to A factory by place capacity charging, will make A factory branched go out basic charge as per installed capacity, therefore, generally maximum demand charging is pressed to by A factory, the metering sublist in Fig. 2 and the equal corresponding A of metering matrix factory, busbar voltage is 6KV, current transformer that sublist connects is TA1, no-load voltage ratio is 3000/5, and current transformer that matrix connects is TA2, and no-load voltage ratio is 150/5.
But because the plant factor of A factory is low, therefore be optimal combination, the table meter of B factory is contained in the outlet of 6KV bus, although from electric weight angle, the electric weight of bus table meter and the metering electric weight of each sublist can be calculated mutually by plus-minus, but the maximum demand Time Inconsistency gathering due to each sublist, thus can not effectively measure maximum demand, according to the utility model installation method to how A factory accurate-metering requirement having been proposed to following scheme:
1) on transformer station's female change measuring screen, a sub-metering electric energy meter is set, requires through mutual inductor, and can measure electric weight and requirement simultaneously;
In the present embodiment, in order to realize the maximum demand metering to A factory, therefore install A factory electric energy meter additional, the model of selected table is 0.5S level 3 × 100V, 3 × 1.5A phase three-wire three electric multi-functional electric energy meter DTSDl316, , adopt the special metering IC or high-precision A/D and high-speed dsp chip, measure two-way meritorious and four-quadrant reactive energy, there is voltage, electric current, power, the measurement functions such as power factor, show and adopt the highly reliable high-performance giant-screen LCD display backlight of being with, shell adopts modular design, sound construction, be installed on the measuring screen of A substation bus bar main transformer.
2) between each sub-metering electric energy meter and main transformer matrix, synchronizing current mutual inductor is set, no-load voltage ratio is K3, makes son, matrix no-load voltage ratio synchronous;
Synchronizing current mutual inductor is made as TA3, and its no-load voltage ratio value is the ratio of metering matrix and the no-load voltage ratio value of sublist,
The no-load voltage ratio K1=3000/5 of known TA1, the no-load voltage ratio K2=150/5 of TA2,
∵K1= K2* K3 ∴K3=100/5
Therefore get TA3 in the present embodiment be: the current transformer of 2 0.2S levels 100/5, the current transformer that the terminals of TA3 are respectively matrix current transformer TA2 and protection module is connected.
3) protective current mutual inductor TA4 is matched as protection module with punching winding, the major-minor side no-load voltage ratio of its mutual inductor is consistent;
For easy to produce and use; the primary election of protective current mutual inductor TA4 can be according to synchronizing current mutual inductor; the i.e. current transformer of 2 0.2S levels 100/5; 2 punching windings are connected with the secondary side of mutual inductor respectively; each winding is 20 circle coils, has so just become 100/100 or perhaps 5/5 current transformer.
4), between each sub-metering electric energy meter, access protection module, prevents short circuit between mutual inductor;
Protection module has played the equivalence switching of electric current, because the winding of major-minor side is consistent, thus do not change the size of electric current itself, thus play the isolation effect to two-way electric current.
5) carry out sublist electric quantity metering, synchronizing current mutual inductor is introduced, and between son, matrix, no-load voltage ratio is got comprehensive no-load voltage ratio, current value stack;
Introduce after synchronizing current mutual inductor, introduce TA2 by no-load voltage ratio 100/5, make the no-load voltage ratio of TA2 become 3000/5, thereby make the current value of TA1 and TA2 produce stack, also do not affect the metering of metering matrix itself simultaneously.
6) due to protection module and synchronizing current mutual inductor, each sublist realizes point other electric energy metrical, maximum demand is fed back to matrix simultaneously, obtains son, matrix continuous data comparatively accurately.
Embodiment bis-
Taking the C transformer station in somewhere as example, its bus total load 10KV all derives from C factory, and busbar voltage is 10KV, and current transformer ratio that sublist connects is 4000/5, and current transformer ratio that matrix connects is 200/5.
Same because the plant factor of C factory is low, therefore be optimal combination, the table meter of D factory is contained in the outlet of 10KV bus, although from electric weight angle, the electric weight of bus table meter and the metering electric weight of each sublist can be calculated mutually by plus-minus, but due to the maximum demand Time Inconsistency that each sublist gathers, therefore can not effectively measure maximum demand, install to how C factory accurate-metering requirement having been proposed to following scheme according to the utility model:
1) on transformer station's female change measuring screen, a sub-metering electric energy meter is set, requires through mutual inductor, and can measure electric weight and requirement simultaneously;
In the present embodiment, in order to realize the maximum demand metering to C factory, therefore install C factory electric energy meter additional, the model of selected table is 0.5S level 3 × 57.7/100V, 3 × 1.5A three-phase and four-line electric multi-functional electric energy meter DTSD188S, when electric energy meter work, voltage, electric current, after sample circuit is sampled respectively, are delivered to amplifying circuit Hyblid Buffer Amplifier, become digital signal by A/D converter again, deliver to and in CPU, carry out calculation process.Owing to having adopted 16 A/D converters, electric current and voltage sampling resolution is greatly improved, adopted the high speed one-chip CPU with DSP speed simultaneously, the chain of data transmission is shortened, thereby reduce the possibility of error in data, have sufficient time to accurately to measure energy data, greatly improve the real-time of electric weight and instantaneous flow, thereby make the accuracy of measuring of electric energy meter have guarantee, CPU is also for time-shared charge and the various inputoutput datas of processing, and complete timesharing according to the predefined period and have, reactive energy measurement and maximum demand metering function, complete the monitoring of operational factor, record store various kinds of data, table meter is installed on the measuring screen of C substation bus bar main transformer.
2) between each sub-metering electric energy meter and main transformer matrix, synchronizing current mutual inductor is set, no-load voltage ratio is K6, makes son, matrix no-load voltage ratio synchronous;
Synchronizing current mutual inductor ratio value is the ratio of metering matrix and the no-load voltage ratio value of sublist,
The no-load voltage ratio K4=4000/5 of known sublist, the no-load voltage ratio K5=200/5 of matrix,
∵K4= K5* K6 ∴K6=100/5
Therefore get synchronizing current mutual inductor in the present embodiment be: the current transformer of 2 0.2S levels 100/5, the current transformer that the terminals of synchronizing current mutual inductor are respectively matrix current transformer and protection module is connected.
3) protective current mutual inductor is matched as protection module with punching winding, the major-minor side no-load voltage ratio of its mutual inductor is consistent;
For easy to produce and use; the primary election of protective current mutual inductor can be according to synchronizing current mutual inductor; the i.e. current transformer of 2 0.2S levels 100/5; 2 punching windings are connected with the secondary side of mutual inductor respectively; each winding is 20 circle coils, has so just become 100/100 or perhaps 5/5 current transformer.
4), between each sub-metering electric energy meter, access protection module, prevents short circuit between mutual inductor;
Protection module has played the equivalence switching of electric current, because the winding of major-minor side is consistent, thus do not change the size of electric current itself, thus play the isolation effect to two-way electric current.
5) carry out sublist electric quantity metering, synchronizing current mutual inductor is introduced, and between son, matrix, no-load voltage ratio is got comprehensive no-load voltage ratio, current value stack;
Introduce after synchronizing current mutual inductor, introduce matrix mutual inductor by no-load voltage ratio 100/5, make the no-load voltage ratio of matrix mutual inductor become 4000/5, thereby make the transformer current value of sublist and matrix produce stack, also do not affect the metering of metering matrix itself simultaneously.
6) due to protection module and synchronizing current mutual inductor, each sublist realizes point other electric energy metrical, maximum demand is fed back to matrix simultaneously, obtains son, matrix continuous data comparatively accurately.
Embodiment tri-
Taking the E transformer station in somewhere as example, its bus total load 35KV all derives from E factory and F factory, and busbar voltage is 35KV, and current transformer ratio that sublist connects is respectively 3000/5 and 1500/5, and current transformer ratio that matrix connects is 150/5.
For optimal combination, the table meter of G factory is contained in the outlet of 35KV bus, although from electric weight angle, the electric weight of bus table meter and the metering electric weight of each sublist can be calculated mutually by plus-minus, but due to the maximum demand Time Inconsistency of each sublist collection, therefore can not effectively measure E factory and F factory maximum demand originally, according to the utility model installation method to how E factory and F factory accurate-metering requirement having been proposed to following scheme:
1) on transformer station's female change measuring screen, two sub-metering electric energy meters are set, require through mutual inductor, and can measure electric weight and requirement simultaneously;
In the present embodiment, in order to realize the maximum demand metering to E factory and F factory, therefore install respectively E factory electric energy meter and F factory electric energy meter additional, the model of selected table is 0.5S level 3 × 100V, 3 × 1.5A phase three-wire three electric multi-functional electric energy meter DSSD188S, when electric energy meter work, voltage, electric current, after sample circuit is sampled respectively, are delivered to amplifying circuit Hyblid Buffer Amplifier, become digital signal by A/D converter again, deliver to and in CPU, carry out calculation process.Owing to having adopted 16 A/D converters, electric current and voltage sampling resolution is greatly improved, adopted the high speed one-chip CPU with DSP speed simultaneously, the chain of data transmission is shortened, thereby reduce the possibility of error in data, have sufficient time to accurately to measure energy data, greatly improve the real-time of electric weight and instantaneous flow, thereby make the accuracy of measuring of electric energy meter have guarantee, CPU is also for time-shared charge and the various inputoutput datas of processing, and complete timesharing according to the predefined period and have, reactive energy measurement and maximum demand metering function, complete the monitoring of operational factor, record store various kinds of data, table meter is all installed on the measuring screen of D substation bus bar main transformer.
2) between each sub-metering electric energy meter and main transformer matrix, synchronizing current mutual inductor is set, no-load voltage ratio is made as respectively K10 and K11, makes son, matrix no-load voltage ratio synchronous;
Synchronizing current mutual inductor ratio value is the ratio of metering matrix and the no-load voltage ratio value of sublist,
The no-load voltage ratio K7=3000/5 of the sublist 1 of known script, the no-load voltage ratio K8=1500/5 of sublist 2, the no-load voltage ratio K9=150/5 of matrix,
∵K7= K9* K10 K8= K9* K11 ∴K10=100/5、 K11=50/5
Therefore get synchronizing current mutual inductor in the present embodiment be: the current transformer of the current transformer of 2 0.2S levels 100/5 and 2 0.2S levels 50/5, the terminals of synchronizing current mutual inductor are connected with the current transformer of matrix current transformer and protection module respectively.
3) protective current mutual inductor is matched as protection module with punching winding, the major-minor side no-load voltage ratio of its mutual inductor is consistent;
For easy to produce and use; protective current mutual inductor is consistent with synchronizing current mutual inductor quantity; just elect the current transformer of 4 0.2S levels 100/5 as; 4 punching windings are connected with the secondary side of mutual inductor respectively; each winding is 20 circle coils, has so just become 100/100 or perhaps 5/5 current transformer.
4), between each sub-metering electric energy meter, access protection module, prevents short circuit between mutual inductor;
Protection module has played the equivalence switching of electric current, because the winding of major-minor side is consistent, thus do not change the size of electric current itself, thus play the isolation effect to two-way electric current.
5) carry out sublist electric quantity metering, synchronizing current mutual inductor is introduced, and between son, matrix, no-load voltage ratio is got comprehensive no-load voltage ratio, current value stack; Introduce after synchronizing current mutual inductor, introduce matrix mutual inductor by no-load voltage ratio 100/5 and 50/5, make the no-load voltage ratio of its each self-corresponding matrix mutual inductor become 3000/5 and 1500/5, thereby make the transformer current value of sublist and matrix produce stack, also do not affect the metering of metering matrix itself simultaneously.
Due to protection module and synchronizing current mutual inductor, each sublist realizes point other electric energy metrical, maximum demand is fed back to matrix simultaneously, obtains son, matrix continuous data comparatively accurately.
Claims (6)
1. transformer station's primary and secondary table maximum demand synchronous measurement device; between transformer station's metering matrix and metering sublist; it is characterized in that: comprise metering module; synchronization module and protection module; described metering module is positioned on transformer station's matrix measuring screen, and described synchronization module is connected with metering module respectively with protection module.
2. transformer station as claimed in claim 1 primary and secondary table maximum demand synchronous measurement device, is characterized in that: described metering module comprises phase three-wire three or three-phase and four-line electric multi-functional electric energy meter.
3. transformer station as claimed in claim 1 or 2 primary and secondary table maximum demand synchronous measurement device, is characterized in that: described metering module is realized externally transmission by RS232 channel.
4. transformer station as claimed in claim 1 primary and secondary table maximum demand synchronous measurement device, is characterized in that: described synchronization module comprises high-precise synchronization current transformer, and its no-load voltage ratio value is the ratio of metering matrix and the no-load voltage ratio value of sublist; Described protection module comprises protective current mutual inductor and punching winding.
5. transformer station as claimed in claim 4 primary and secondary table maximum demand synchronous measurement device, is characterized in that: described synchronizing current mutual inductor is 2.
6. transformer station as claimed in claim 4 primary and secondary table maximum demand synchronous measurement device, is characterized in that: consistent with the current transformer quantity in described protection module in described synchronization module.
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| CN201420362807.5U CN204008846U (en) | 2014-07-03 | 2014-07-03 | A kind of transformer station primary and secondary table maximum demand synchronous measurement device |
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| CN201420362807.5U CN204008846U (en) | 2014-07-03 | 2014-07-03 | A kind of transformer station primary and secondary table maximum demand synchronous measurement device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076198A (en) * | 2014-07-03 | 2014-10-01 | 国网河南省电力公司平顶山供电公司 | Maximum demand synchronous metering device for primary meter and secondary meter of transformer substation and metering method |
| CN110836990A (en) * | 2018-08-16 | 2020-02-25 | 云丁智能科技（北京）有限公司 | Electric quantity charging system, method and related device |
| CN112362938A (en) * | 2020-12-04 | 2021-02-12 | 国网青海省电力公司 | Multi-loop or power supply electricity consumption customer maximum demand meter device |
-
2014
- 2014-07-03 CN CN201420362807.5U patent/CN204008846U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104076198A (en) * | 2014-07-03 | 2014-10-01 | 国网河南省电力公司平顶山供电公司 | Maximum demand synchronous metering device for primary meter and secondary meter of transformer substation and metering method |
| CN110836990A (en) * | 2018-08-16 | 2020-02-25 | 云丁智能科技（北京）有限公司 | Electric quantity charging system, method and related device |
| CN112362938A (en) * | 2020-12-04 | 2021-02-12 | 国网青海省电力公司 | Multi-loop or power supply electricity consumption customer maximum demand meter device |
| CN112362938B (en) * | 2020-12-04 | 2023-11-07 | 国网青海省电力公司 | Multi-loop or power supply electricity customer maximum demand meter device |
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