CN203811795U - Remote detection system for electric energy metering information of transformer station - Google Patents
Remote detection system for electric energy metering information of transformer station Download PDFInfo
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Abstract
The utility model discloses a remote detection system for the electric energy metering information of a transformer station, and the system comprises an on-site detection and verification device, a secondary voltage drop monitoring device for a voltage transformer, a secondary loop load measurement device for a mutual inductor, a local control computer, and a remote control computer. The input end of the on-site detection and verification device is used for connecting a plurality of detected electric meters, and the input ends of the detected electric meters are respectively connected with a secondary side of the voltage transformer and a secondary side of a current transformer. The first input end of the secondary voltage drop monitoring device for the voltage transformer is connected with the secondary side of the voltage transformer. The second input end of the secondary voltage drop monitoring device for the voltage transformer is connected with the input ends of the detected electric meters. The output end of the secondary voltage drop monitoring device for the voltage transformer is connected with the local control computer. The input end of the secondary loop load measurement device for the mutual inductor is connected with a secondary side of the mutual inductor and the input ends of the detected electric meters. The output end of the secondary loop load measurement device for the mutual inductor is connected with the on-site detection and verification device.
Description
Technical field
The utility model relates to transformer station's checkout equipment technical field, relates in particular to a kind of transformer station electric energy metrical information remote detection system.
Background technology
Along with intelligent grid enters the all-round construction stage, intelligent substation increases rapidly.By professional, regularly carry instrument and equipment to on-the-spot management mode of electric power meter being carried out to periodic inspection at present, in actual operation, be gradually difficult to meet the needs of realizing electric power meter management automation.Therefore electric energy metrical information automation monitoring equipment is a kind of indispensable management tool.
According to the requirement of DL/T448-2000 < < electric power meter technical management rules > >, the check at least every 3 months of I class electric energy meter once, once, at least annual field test of III class electric energy meter once for the check at least every 6 months of II class electric energy meter; Electromagnetic potential transformer (hereinafter to be referred as: voltage transformer (VT)) secondary voltage drop is every 2 years 1 time; Current transformer (hereinafter to be referred as: TA) be every 5 or 10 years 1 time.To the management method of electric power meter, be mainly by professional, regularly to carry instrument and equipment to scene, to carry out periodic inspection at present.By after manually detection data being recorded, arranged, transfer administrative authority and analyze, manage again.
Widely distributed electric power meter needs metrological personnel to carry out a large amount of on-the-spot test work the whole year, far away, task is heavy, it is pressed for time.Along with the expansion of electrical network scale, measuring apparatus is more and more, and workload and difficulty continue to increase.Current management mode is gradually difficult to meet the needs of realizing electric power meter management automation in actual operation.Simultaneously, metrological personnel is also found some problems below existence in actual field-checking work: (1) is although the current remote automatic meter reading function that realized, but this just carries out remote transmission to the information about power of electric energy meter storage inside, cannot test the working condition of electric energy meter integral body and precision etc., can not carry out Real-Time Monitoring to the error of electric energy meter, be difficult to the metering fault that discovery occurs between twice check in time.(2) at every turn when electric energy meter is carried out to on-the-spot accuracy test, operations such as need to unclamping the connection terminal on measuring screen and screw, multi-pass operations often has the phenomenons such as the loosening or stripped thread of connection terminal later, has larger potential faults.(3) load of secondary circuit be there are certain requirements to (general active power >10W during field test electrical energy meter accuracy, power factor >0.5), once load or power factor are too low, the work of can not testing, causes coming back after a vain attempt.(4) electric energy meter in measuring apparatus, TV(voltage transformer (VT)) and secondary circuit, TA(current transformer) and secondary circuit, wherein any one link all can affect the accuracy of metering.People often only pay attention to the detection to electric energy meter accuracy and wiring correctness, and the detection of mutual inductor and secondary circuit thereof is often out in the cold, and the impact that the fault of this part is brought reaches tens times of electric energy meter error sometimes.
Utility model content
The purpose of this utility model is to provide a kind of transformer station electric energy metrical information remote detection system, the Detection & Controling of remote control terminal to the electric energy metrical information of local transformer station have been realized, without a large amount of personnel, carry out again Site Detection, avoid leading to errors because of manual operation, and energy Measurement accuracy ammeter information, reduce widely personnel labour, saved human and material resources, financial resources, promoted electric power information, robotization, intelligentized development.
The technical solution adopted in the utility model is:
Transformer station's electric energy metrical information remote detection system, comprises Site Detection and calibration equipment, voltage transformer secondary voltage drop monitoring device, transformer secondary circuit load-measuring device, local computing machine and the remote control computer controlled; Site Detection is used for being connected a plurality of tested ammeters with the input end of calibration equipment, and the input end of tested ammeter connects respectively voltage transformer secondary side summation current transformer secondary side; The first input end of voltage transformer secondary voltage drop monitoring device connects voltage transformer secondary side, the second input end of voltage transformer secondary voltage drop monitoring device connects the input end of tested ammeter, and the output terminal of voltage transformer secondary voltage drop monitoring device connects the local computing machine of controlling; The input end of transformer secondary circuit load-measuring device connects the input end of mutual inductor secondary side and tested ammeter, and the output terminal of transformer secondary circuit load-measuring device connects Site Detection and calibration equipment.
Described Site Detection and calibration equipment comprise standard scale, the input end of standard scale connects the output terminal of a plurality of tested ammeters by data acquisition module, the output terminal of standard scale connects the signal input part of CPU (central processing unit), the first output terminal of CPU (central processing unit) connects the local computing machine of controlling by communication unit, the second output terminal of CPU (central processing unit) is connected with display module is set, and the 3rd output terminal of CPU (central processing unit) is connected with storer.
Described data acquisition module comprises current switching unit, voltage switch unit and impulsive switched unit, current switching unit comprises loop switch module and fault secure circuit, loop switch module comprises blockade contact, loop and loop incision relay circuit, in parallel between blockade contact, loop, loop incision relay circuit, fault secure circuit, then in series connection and secondary loop of mutual inductor, loop incision relay circuit and the input end of blockade contact, loop are connected respectively the first control output end of CPU (central processing unit), and the output terminal of loop incision relay circuit is by bus-bar connection standard table, voltage switch unit connects the second control output end of CPU (central processing unit), voltage switch unit comprises level Four multiselect one handover module, the input end of first order multiselect one handover module connects a plurality of tested ammeter output terminals, the output terminal of first order multiselect one handover module connects the input end of second level multiselect one handover module, the output terminal of second level multiselect one handover module connects the input end of third level multiselect one handover module, the output terminal of third level multiselect one handover module connects the input end of fourth stage multiselect one handover module, the output terminal connection standard table of fourth stage multiselect one handover module, impulsive switched unit comprises meritorious burst process module and idle burst process module, the input end of meritorious burst process module and idle burst process module is connected respectively the 3rd control output end of CPU (central processing unit), the output terminal of meritorious burst process module and idle burst process module is connected the input end of meritorious/idle selection module, the output terminal connection standard table of meritorious/idle selection module.
Described fault secure circuit comprises loop protection contact, connection with clamp diode groups and switch tube driving circuit; in parallel between loop protection contact, connection with clamp diode groups and switch tube driving circuit; be series at again in secondary loop of mutual inductor; the feedback output end link circuit protection contact of switch tube driving circuit, the signal output part of switch tube driving circuit connects far-end alarm module.
Described voltage transformer secondary voltage drop monitoring device comprises to be measured slave and measures main frame, and the input terminal of measuring slave connects voltage transformer secondary side output terminal, and the input terminal of measuring main frame connects the input end of tested ammeter; Described measurement slave and measurement main frame all include master controller, PLC, voltage acquisition module, GPS module and phase detecting module, the input end of master controller connects respectively the output terminal of PLC, voltage acquisition module, GPS module and phase detecting module, GPS module also connects phase detecting module, and the output terminal of measuring the master controller of main frame connects the local computing machine of controlling.
Described transformer secondary circuit load-measuring device comprises Secondary Circuit of Potential Transformer Road test circuit summation current transformer secondary circuit Road test circuit, Secondary Circuit of Potential Transformer Road test circuit comprises the straight-through current transformer of Secondary Circuit of Potential Transformer series connection, and wherein the output terminal of voltage transformer (VT) and the input end of tested ammeter are connected Site Detection and calibration equipment by wire; Secondary loop of mutual inductor Road test circuit is connected Site Detection and calibration equipment by the input end of the output terminal of current transformer and tested ammeter by wire.
Field monitoring is located at by the measurement main frame of described voltage transformer secondary voltage drop monitoring device and calibration equipment is inner.
Described field monitoring and calibration equipment have a plurality of, are located at respectively in a plurality of transformer stations.
The utility model realizes by field monitoring and calibration equipment, voltage transformer secondary voltage drop monitoring device, transformer secondary circuit load-measuring device, local control computing machine and remote control computer the electric energy metrical information that remote control terminal detected and controlled local transformer station; Mainly utilize field monitoring and calibration equipment to follow the tracks of and verification the voltage and current of detected ammeter, pass through again difference in magnitude and the phase differential of Secondary Circuit of Potential Transformer pressure drop monitoring device synchro measure Secondary Circuit of Potential Transformer, then by transformer secondary circuit load test device, complete the Road test of secondary voltage circuit and current return; Reduce widely personnel labour, saved human and material resources, financial resources, promoted electric power information, robotization, intelligentized development.
Accompanying drawing explanation
Fig. 1 is in overall system architecture block diagram of the present utility model and dotted line frame, to be the schematic block circuit diagram of field monitoring of the present utility model and calibration equipment;
Fig. 2 is the schematic block circuit diagram of current switching of the present utility model unit;
Fig. 3 is the schematic block circuit diagram of voltage switch unit of the present utility model;
Fig. 4 is the schematic block circuit diagram of impulsive switched of the present utility model unit;
Fig. 5 is the schematic block circuit diagram of voltage transformer secondary voltage drop monitoring device of the present utility model;
Fig. 6 is the schematic block circuit diagram of Secondary Circuit of Potential Transformer load-measuring device of the present utility model;
Fig. 7 is the schematic block circuit diagram of secondary loop of mutual inductor load-measuring device of the present utility model.
Embodiment
As shown in Figure 1, the utility model comprises Site Detection and calibration equipment, voltage transformer secondary voltage drop monitoring device, transformer secondary circuit load-measuring device, local control computing machine and remote control computer; Site Detection is used for being connected a plurality of tested ammeters with the input end of calibration equipment, and the input end of tested ammeter connects respectively voltage transformer secondary side summation current transformer secondary side; Voltage transformer secondary voltage drop monitoring device comprises to be measured slave and measures main frame, the input terminal of measuring slave connects voltage transformer secondary side output terminal, the input terminal of measuring main frame connects the input end of tested ammeter, and the output terminal of voltage transformer secondary voltage drop monitoring device connects the local computing machine of controlling; The input end of transformer secondary circuit load-measuring device connects the input end of mutual inductor secondary side and tested ammeter, and the output terminal of transformer secondary circuit load-measuring device connects Site Detection and calibration equipment.
The principle of work of native system: native system can carry out comprehensive on-line monitoring, fault judgement, record analysis and automatic Verification to operating electric energy meter.Native system is realized the error checking of tested ammeter by field monitoring and calibration equipment, TV(voltage transformer (VT)) secondary voltage drop monitoring, the functions such as transformer secondary circuit load measurement, first by laying various signal cables, by the various signal leadings in monitored loop in field monitoring and calibration equipment, through each data channel switch unit, carry out data acquisition, and after the data that collect are processed via standard scale, be uploaded to CPU (central processing unit), and by CPU (central processing unit) by the information analysis measuring, process, and data are stored, show and data upload, send afterwards the local computing machine of controlling to, then send remote control computer to, reach the object of Long-distance Control and detection.
As shown in dotted line frame in Fig. 1, Site Detection and calibration equipment comprise standard scale, the input end of standard scale connects the output terminal of a plurality of tested ammeters by data acquisition module, the output terminal of standard scale connects the signal input part of CPU (central processing unit), the first output terminal of CPU (central processing unit) connects the local computing machine of controlling by communication unit, the second output terminal of CPU (central processing unit) is connected with display module is set, and the 3rd output terminal of CPU (central processing unit) is connected with storer.
Site Detection and calibration equipment mainly complete tested electric energy meter error verifying function, the current sampling circuit of on-the-spot tested ammeter adopts mode and the standard scale of series connection to link together, the voltage sample loop of each tested ammeter adopts mode in parallel and standard scale to link together, central processing unit controls voltage switch unit, current switching unit and impulsive switched unit, choose the voltage signal in detected loop, current signal and electric flux pulse signal input standard scale, the electric energy of the electrical energy pulse output signal representative by more tested ammeter and standard scale at one time in the electric energy of accumulative total, calculate difference between the two, it is benchmark that tested ammeter be take the electric energy that standard scale was measured, the poor number percent of its value is as the actual error of tested ammeter.CPU (central processing unit) reads the various electrical quantitys (voltage, electric current, power factor, phase angle, frequency and power etc.) of the tested ammeter that standard scale calculates at any time, and stores and show.
As shown in Fig. 2, the current acquisition of tested ammeter, switching principle: current switching unit comprises loop switch module and fault secure circuit.The secondary current loop of every tested ammeter, when this table is accredited, all by " loop blockade ", when needs detect, this secondary loop of mutual inductor will not be access in.First the loop of central processing unit controls loop switch module incision relay circuit (loop incision relay group) is by this secondary current loop incision bus-bar, then open " blockade contact, loop ", and system can start to detect secondary loop of mutual inductor electric current.When this table calibrating complete, when secondary loop of mutual inductor need to be exited, first, central processing unit controls " blockade contact, loop " closure, then incision relay circuit in loop disconnects and being connected of bus-bar, system restPoses.
When the system failure causes opening a way, fault secure circuit responds immediately, and connection with clamp diode groups can, by open circuit of secondary loop of current transformer voltage clamping in 1.4V, be guaranteed security of system.Can work by driving switch pipe simultaneously, make the loop protection closing of contact, output alarm signal, notifies remote control terminal simultaneously.This protects action, only after the system failure is eliminated, and manual reset.
As shown in Figure 3, the voltage acquisition of tested ammeter, switching principle: adopt " multiselect one handover module ".By the logical design of " multiselect one ", guaranteed when plurality of voltages is inputted simultaneously, at output terminal, only select a wherein road Voltage-output, and between different voltage circuit and same voltage circuit each is alternate with short circuit.
As shown in Figure 4, the pulse collection of tested ammeter, switching principle: the pulse of tested ammeter is output after photoelectricity isolation, each electrical energy pulse may be carried forward position shake and rear along dither signal secretly, therefore at 74LS251 chip output pin, being connected to RC debouncing circuit (is prior art, do not repeat them here), effectively improved the quality of electrical energy impulse signals, prevented that misreport of system is alert, misoperation.Its impulsive switched unit and current switching units synchronization, adopt data selector, completes the interface of Transistor-Transistor Logic level, on-the-spotly through shielded cable, transmits the tested ammeter pulse signal of returning and after shaping, send into standard scale and carry out error conversion.
As shown in Figure 5, the principle of work of voltage transformer secondary voltage drop monitoring device: the monitoring of Secondary Circuit of Potential Transformer pressure drop is the voltage difference of measuring voltage transformer secondary circuit top and end, i.e. voltage difference between label 4 and label 6 in Fig. 1.At voltage transformer secondary side output port (Fig. 1 label 4 places), locate to place measurement slave, place and measure main frame at tested ammeter input port place, by measuring slave, the voltage effective value at this place and phase information are sent to measurement main frame by having the GPS module of power line carrier communication function, measure main frame and the voltage at two places is compared to difference in magnitude and the phase differential that can draw voltage, thereby obtain ratio and the angular difference of Secondary Circuit of Potential Transformer.Measure main frame and measure slave and using the synchronizing signal of gps signal as the two ends data acquisition of voltage transformer secondary circuit, the voltage vector at synchro measure voltage transformer (VT) output port place and tested ammeter input port place, in conjunction with phase locking frequency multiplying technology, the Stability and veracity of system is guaranteed.
As shown in Fig. 6 and Fig. 7, the principle of work of transformer secondary circuit load-measuring device: be first the principle of work of Secondary Circuit of Potential Transformer load-measuring device, as shown in Figure 6, U wherein
tfor voltage transformer secondary side outlet voltage, U
mfor tested ammeter input port voltage, utilize the function of the voltage transformer secondary anode-cathode voltage that voltage transformer secondary voltage drop monitoring device collects, thereby calculate U
t, U
m.By the higher straight-through current transformer of sensitivity of connecting, measure secondary current I (numerical value is generally at tens of milliamperes) in Secondary Circuit of Potential Transformer, then obtain voltage U from voltage transformer secondary voltage drop monitoring device circuit
t, U
tbe TV secondary load S with the product of I
v.
The principle of work of secondary loop of mutual inductor load-measuring device, as shown in Figure 7, the method that the on-line testing of secondary loop of mutual inductor load can adopt direct wiring to measure, during i.e. on-the-spot use, adopt from monitoring main frame and go between to the method for Current Transformer Secondary root, as shown in Figure 7, directly measure Current Transformer Secondary voltage U
o(numerical value is generally at hundreds of millivolts).In conjunction with the Current Transformer Secondary electric current I of having measured, U
obe TA secondary load S with the product of I
a.
Claims (8)
1.Yi Zhong transformer station electric energy metrical information remote detection system, is characterized in that: comprise Site Detection and calibration equipment, voltage transformer secondary voltage drop monitoring device, transformer secondary circuit load-measuring device, local computing machine and the remote control computer controlled; Site Detection is used for being connected a plurality of tested ammeters with the input end of calibration equipment, and the input end of tested ammeter connects respectively voltage transformer secondary side summation current transformer secondary side; The first input end of voltage transformer secondary voltage drop monitoring device connects voltage transformer secondary side, the second input end of voltage transformer secondary voltage drop monitoring device connects the input end of tested ammeter, and the output terminal of voltage transformer secondary voltage drop monitoring device connects the local computing machine of controlling; The input end of transformer secondary circuit load-measuring device connects the input end of mutual inductor secondary side and tested ammeter, and the output terminal of transformer secondary circuit load-measuring device connects Site Detection and calibration equipment.
2. transformer station according to claim 1 electric energy metrical information remote detection system, it is characterized in that: described Site Detection and calibration equipment comprise standard scale, the input end of standard scale connects the output terminal of a plurality of tested ammeters by data acquisition module, the output terminal of standard scale connects the signal input part of CPU (central processing unit), the first output terminal of CPU (central processing unit) connects the local computing machine of controlling by communication unit, the second output terminal of CPU (central processing unit) is connected with display module is set, and the 3rd output terminal of CPU (central processing unit) is connected with storer.
3. transformer station according to claim 2 electric energy metrical information remote detection system, it is characterized in that: described data acquisition module comprises current switching unit, voltage switch unit and impulsive switched unit, current switching unit comprises loop switch module and fault secure circuit, loop switch module comprises blockade contact, loop and loop incision relay circuit, in parallel between blockade contact, loop, loop incision relay circuit, fault secure circuit, then in series connection and secondary loop of mutual inductor, loop incision relay circuit and the input end of blockade contact, loop are connected respectively the first control output end of CPU (central processing unit), and the output terminal of loop incision relay circuit is by bus-bar connection standard table, voltage switch unit connects the second control output end of CPU (central processing unit), voltage switch unit comprises level Four multiselect one handover module, the input end of first order multiselect one handover module connects a plurality of tested ammeter output terminals, the output terminal of first order multiselect one handover module connects the input end of second level multiselect one handover module, the output terminal of second level multiselect one handover module connects the input end of third level multiselect one handover module, the output terminal of third level multiselect one handover module connects the input end of fourth stage multiselect one handover module, the output terminal connection standard table of fourth stage multiselect one handover module, impulsive switched unit comprises meritorious burst process module and idle burst process module, the input end of meritorious burst process module and idle burst process module is connected respectively the 3rd control output end of CPU (central processing unit), the output terminal of meritorious burst process module and idle burst process module is connected the input end of meritorious/idle selection module, the output terminal connection standard table of meritorious/idle selection module.
4. transformer station according to claim 3 electric energy metrical information remote detection system; it is characterized in that: described fault secure circuit comprises loop protection contact, connection with clamp diode groups and switch tube driving circuit; in parallel between loop protection contact, connection with clamp diode groups and switch tube driving circuit; be series at again in secondary loop of mutual inductor; the feedback output end link circuit protection contact of switch tube driving circuit, the signal output part of switch tube driving circuit connects far-end alarm module.
5. transformer station according to claim 4 electric energy metrical information remote detection system, it is characterized in that: described voltage transformer secondary voltage drop monitoring device comprises to be measured slave and measure main frame, the input terminal of measuring slave connects voltage transformer secondary side output terminal, and the input terminal of measuring main frame connects the input end of tested ammeter; Described measurement slave and measurement main frame all include master controller, PLC, voltage acquisition module, GPS module and phase detecting module, the input end of master controller connects respectively the output terminal of PLC, voltage acquisition module, GPS module and phase detecting module, GPS module also connects phase detecting module, and the output terminal of measuring the master controller of main frame connects the local computing machine of controlling.
6. transformer station according to claim 5 electric energy metrical information remote detection system, it is characterized in that: described transformer secondary circuit load-measuring device comprises Secondary Circuit of Potential Transformer Road test circuit summation current transformer secondary circuit Road test circuit, Secondary Circuit of Potential Transformer Road test circuit comprises the straight-through current transformer of Secondary Circuit of Potential Transformer series connection, and wherein the output terminal of voltage transformer (VT) and the input end of tested ammeter are connected Site Detection and calibration equipment by wire; Secondary loop of mutual inductor Road test circuit is connected Site Detection and calibration equipment by the input end of the output terminal of current transformer and tested ammeter by wire.
7. transformer station according to claim 5 electric energy metrical information remote detection system, is characterized in that: field monitoring is located at by the measurement main frame of described voltage transformer secondary voltage drop monitoring device and calibration equipment is inner.
8. transformer station according to claim 7 electric energy metrical information remote detection system, is characterized in that: described field monitoring and calibration equipment have a plurality of, is located at respectively in a plurality of transformer stations.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320587319.XU CN203811795U (en) | 2013-09-23 | 2013-09-23 | Remote detection system for electric energy metering information of transformer station |
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| CN201320587319.XU CN203811795U (en) | 2013-09-23 | 2013-09-23 | Remote detection system for electric energy metering information of transformer station |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630868A (en) * | 2013-09-23 | 2014-03-12 | 中国电子科技集团公司第二十七研究所 | Remote substation electrical energy metering information detection system |
| CN104298153A (en) * | 2014-09-29 | 2015-01-21 | 许继电气股份有限公司 | Signal collecting method for intelligent substation |
| CN105203987A (en) * | 2015-10-27 | 2015-12-30 | 国网山东利津县供电公司 | Long-distance detection device and method for electric energy measurement of transformer substation |
| CN105242081A (en) * | 2015-10-28 | 2016-01-13 | 河南开启电力实业有限公司 | Substation electric energy metering remote monitoring system |
| CN106093563A (en) * | 2016-05-27 | 2016-11-09 | 东莞市联洲知识产权运营管理有限公司 | A kind of substation secondary side power measuring system and measuring method thereof |
| CN107436420A (en) * | 2016-05-27 | 2017-12-05 | 山东大学 | A kind of electric energy metrical remote verification monitoring system and its method of work |
| CN107966652A (en) * | 2016-10-20 | 2018-04-27 | 国网新疆电力公司疆南供电公司 | A kind of transforming plant DC electric power loop Graded coordination test device |
| CN110196403A (en) * | 2019-06-27 | 2019-09-03 | 西安创奕信息科技有限公司 | A kind of transformer secondary voltage drop on-line monitoring system based on technology of Internet of things |
-
2013
- 2013-09-23 CN CN201320587319.XU patent/CN203811795U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630868A (en) * | 2013-09-23 | 2014-03-12 | 中国电子科技集团公司第二十七研究所 | Remote substation electrical energy metering information detection system |
| CN104298153A (en) * | 2014-09-29 | 2015-01-21 | 许继电气股份有限公司 | Signal collecting method for intelligent substation |
| CN105203987A (en) * | 2015-10-27 | 2015-12-30 | 国网山东利津县供电公司 | Long-distance detection device and method for electric energy measurement of transformer substation |
| CN105242081A (en) * | 2015-10-28 | 2016-01-13 | 河南开启电力实业有限公司 | Substation electric energy metering remote monitoring system |
| CN106093563A (en) * | 2016-05-27 | 2016-11-09 | 东莞市联洲知识产权运营管理有限公司 | A kind of substation secondary side power measuring system and measuring method thereof |
| CN107436420A (en) * | 2016-05-27 | 2017-12-05 | 山东大学 | A kind of electric energy metrical remote verification monitoring system and its method of work |
| CN107966652A (en) * | 2016-10-20 | 2018-04-27 | 国网新疆电力公司疆南供电公司 | A kind of transforming plant DC electric power loop Graded coordination test device |
| CN110196403A (en) * | 2019-06-27 | 2019-09-03 | 西安创奕信息科技有限公司 | A kind of transformer secondary voltage drop on-line monitoring system based on technology of Internet of things |
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