CN204855663U - Capacitive insulation of equipment characteristic monitoring system based on bus distributing type - Google Patents
Capacitive insulation of equipment characteristic monitoring system based on bus distributing type Download PDFInfo
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- CN204855663U CN204855663U CN201520490592.XU CN201520490592U CN204855663U CN 204855663 U CN204855663 U CN 204855663U CN 201520490592 U CN201520490592 U CN 201520490592U CN 204855663 U CN204855663 U CN 204855663U
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Abstract
The utility model relates to a power equipment condition monitoring and failure diagnosis field, especially equipment situation early -warning and the collection and the transmission technology of transporting dimension decision -making data, concretely relates to capacitive insulation of equipment characteristic monitoring system based on bus distributing type, including a plurality of parallel front -end collection unit, local module, station side communication unit, power frequency voltage signal acquisition unit, display, GPRS wireless communication module and printer, a plurality of parallel front -end collection units are connected with station side communication unit through local module, station side communication unit still is connected with display, GPRS wireless communication module and printer respectively, local module is connected with power frequency voltage signal acquisition unit (8), the utility model discloses can avoid the signal to receive the interference of space electromagnetic field in the transmission course to have high insulating, can improve the measuring precision, ensure the reliability of the data.
Description
Technical field
The utility model relates to power equipment state monitoring and fault diagnosis field, particularly the sample and transform technology of equipment state early warning and O&M decision data, is specifically related to a kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system.
Background technology
Capacitive apparatus in existing intelligent grid high voltage electric equipment is the electrical equipment with capacitance plate insulation system, mainly comprises bushing shell for transformer, voltage transformer (VT), current transformer or coupling condenser etc.Capacitive apparatus quantity accounts for 40% to 50% of substation equipment total amount; The insulation characterisitic characterization value of capacitive apparatus mainly comprise dielectric loss, capacitance, to vagabond current; The insulation fault of capacitive apparatus not only jeopardizes the safety of miscellaneous equipment and the person, even can the safe operation of range of influence electrical network.Therefore, capacitive apparatus is carried out accurately to on-line monitoring is significant.
Mainly adopt centralized capacitive apparatus insulated characteristic on-line monitoring system both at home and abroad at present, the monitoring system of cluster sampling formula framework with server signal cluster sampling for core, sensor signal converts through the shaping of hyperchannel advance signal processor, the capacitive apparatus leakage current detected signals collecting current transformer by on-line data acquisition module.Utilize common cable directly the simulating signal cable that sensor exports to be caused the data acquisition card of computing machine, simultaneously after carrying out analog-to-digital conversion, directly calculate the dielectric features parameter of equipment, realize continuing to monitor capacitive apparatus insulated characteristic.
Although aforesaid way can realize the synchronized sampling to current signal; But still there is following limitation:
(1) long, too much signal cable need be laid at the scene, cause simulating signal to have decay in various degree, and also cannot avoid the various electromagnetic interference (EMI) in scene.
(2) because traditional measurement method, electric signal transmission and system architecture are vulnerable to the interference of substation field environment, and the impact of the many factors such as the stability of system itself and degree of accuracy, cause adopting the monitoring system of bus distributed structure cannot meet for the accurate sampling request of the phase place between electric current, voltage signal, affect measuring accuracy and the analysis of measurement result is judged, and have impact on applying of capacitive apparatus insulated characteristic monitoring technology to a certain extent.
(3) like product of this pattern mostly is isolated pick-up unit, cannot form the on-line monitoring system comprising monitoring, diagnosing, data storage, compare of analysis, status poll and measured value and upload.
(4) traditional leakage current measurement mutual inductor is based on electromagnetic induction principle, the pacing items that mutual inductor effectively works is must have magnetic flux in iron core, need exciting current to set up magnetic flux in transformer iron core, and exciting current is the main cause causing measurement error of transformer.
Above-mentioned situation illustrates, traditional testing circuit has limitation when being applied to and analyzing capacitive apparatus insulated characteristic, does not meet the basic demand of further lifting means safety operation level; Therefore palpus is developed a kind of monitoring, is analyzed the bus distributed testing circuit of capacitive apparatus insulated characteristic, the insulation fault of control capacitive apparatus.
Utility model content
The purpose of this utility model is the problems referred to above solving prior art, provide that a kind of antijamming capability is strong and extendability is strong, and based on bus distributed capacitive apparatus insulated characteristic monitoring system, to achieve these goals, the technical solution adopted in the utility model is as follows:
A kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: comprise several parallel front-end collection unit, local modules, stand and hold communication unit, power-frequency voltage signal gathering unit, display, GPRS wireless communication module and printer, described multiple parallel front-end collection unit holds communication unit to be connected by local module with station, described station end communication unit is also connected with display, GPRS wireless communication module and printer respectively, and described local module is connected with power-frequency voltage signal gathering unit.
Concrete, described front-end collection unit comprises zero-flux current transformer and terminal module, it is connected in series that described zero-flux current transformer and terminal module use optical fiber to carry out, the terminal module of described front-end collection unit is connected with local module, in the utility model, described terminal module is arranged near capacitive apparatus body, to be connected and to gather, nurse one's health capacitive apparatus that zero-flux current transformer transmits current signal convert digital signal to over the ground by fibre circuit with zero-flux current transformer;
Further, described terminal module comprises terminal A/D analog-digital commutator, terminal photoelectric conversion device and terminal digital signals are encoded and decoding device, described zero-flux current transformer is successively by terminal A/D analog-digital commutator, terminal photoelectric conversion device, terminal digital signals coding and decoding device are connected with local module, in the utility model, described local module is generally positioned in the monitoring screen cabinet of central control room, optical cable is adopted to be connected with the signal output part of terminal module, described power-frequency voltage signal gathering unit obtains transformer station's main bus-bar side system voltage signal, when also producing rising edge at system voltage zero crossing, the voltage signal generated is input to local module.
Concrete, described power-frequency voltage signal gathering unit adopts high-speed dsp-TMS320LF2407 chip.
Concrete, described station end communication unit adopts the IPC-611 industrial computer series of 4U formula.
More specifically, described zero-flux current transformer employing aperture is the punching structure of 30 millimeters, described zero-flux current transformer comprises winding, Secondary Winding, the first iron core, the second iron core, compensative winding and a detection winding, one end of described first iron core and the mutual occlusal contact condition in one end of the second iron core, the while of a described winding and Secondary Winding, lap wound is at the first iron core and the second occlusal contact condition place mutually unshakable in one's determination, described compensative winding is around the other end of the first iron core, and described detection winding is around the other end of the second iron core.
In sum, the utility model is owing to have employed such scheme, and the utility model has the following advantages:
(1) adopt the arrangement of distributed frame, guarantee the normal operation to miscellaneous equipment monitoring circuit can not be had influence on during the component maintenance such as single zero-flux current transformer.
(2) by optical fiber data link system transfers electric current and voltage signal, can avoid signal in transmitting procedure, be subject to the interference of external electromagnetic field, and there is high-insulativity, the precision of measurement can be improved, guarantee the reliability of data.
(3) by the configured in one piece of zero-flux current transformer, local module, terminal module, end communication unit of standing, display, printer and GPRS wireless communication module, the Whole Process Control stored from capacitive apparatus insulated characteristic signals detection, analyzing and diagnosing, early warning, analysis, displaying and data is realized.
(4) limitation of traditional fiber transmission technology range of application is breached, thorough reversed because of many unfavorable factors such as strong electromagnetic Radio frequency interference (RFI) in transformer station, the interference of coupling superpotential cause the passive situation of monitoring system fluctuation of service, significantly improve the reliability of on-line monitoring unit.
(5) the Optical Fiber Transmission synchronous signal circuit of insulation characterisitic measuring-signal has been initiated, the stringent synchronization of all kinds of monitoring means signal sampling of effective guarantee, eliminate the phase error that asynchronous sampling causes, significantly improve parameter result of calculations such as capacitive apparatus medium losses.
(6) capacitive apparatus insulated performance data can store, and guarantees accuracy and the continuity of analyzing data variation trend.In addition, also send alarm message breath by GPRS wireless communication module, with grasp in time survey data, and carry out check processing.
(7) take the lead in designing, applying a kind of zero-flux current transformer with compensative winding, the exciting current needed for leakage current measurement is provided, captures in traditional leakage current measurement because mutual inductor exciting current is on the impact of current value measuring accuracy at one stroke.
(8) zero-flux current transformer is basic functional principle with electromagnetic coupled, namely once and between Secondary Winding does not have electrical link, only has the contact of magnetic, not only can avoid the original ground loop of change equipment (or open circuit); Also can avoid monitored capacitive apparatus in normal course of operation by secondary circuit (i.e. the external circuit of secondary winding in current transformer) impact.In addition, double measurement circuit can also be effected a radical cure and the hidden danger of holding communication unit encroached on by primary circuit (i.e. a winding and high tension loop) superpotential of standing.
(9) end communication unit of standing has manifested the standardization of all kinds of capacitive apparatus Monitoring Data, unitized process, effectively reduces the complicacy of data statement; Standard format is derived in supported data virtual view, support simultaneously, possesses the ability with higher level's monitoring and warning center Seamless integration-, significantly can improve the efficiency that monitoring, diagnosing, data storage, compare of analysis, status poll and measured value are uploaded.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model example or technical scheme of the prior art, introduce doing accompanying drawing required in embodiment or description of the prior art simply below, obviously, accompanying drawing in the following describes is only examples more of the present utility model, to those skilled in the art, do not paying under creationary prerequisite, other accompanying drawing can also obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram based on bus distributed capacitive apparatus insulated characteristic monitoring system of the utility model.
Fig. 2 is the syndeton schematic diagram of terminal module of the present utility model.
Fig. 3 is zero-flux current transformer structure principle chart of the present utility model.
Fig. 4 is the equivalent circuit theory figure of zero-flux current transformer of the present utility model.
Fig. 5 is the schematic appearance of zero-flux current transformer of the present utility model.
In accompanying drawing, 1-zero-flux current transformer, 2-terminal module, the local module of 3-, 4-station end communication unit, 5-display, 6-GPRS wireless communication module, 7-printer, 8-power-frequency voltage signal gathering unit, 20-terminal A/D analog-digital commutator, 21-terminal photoelectric conversion device, 22-terminal digital signals coding and decoding device 22,100-winding, 102-Secondary Winding, 103-first iron core, 104-second is unshakable in one's determination, 105-compensative winding, 106 detect winding, 107-excitation current source, 108-high resistance voltmeter.
Embodiment
Below in conjunction with the accompanying drawing in the utility model example, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, a kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: comprise the front-end collection unit that several are parallel, local module 3, stand and hold communication unit 4, power-frequency voltage signal gathering unit 8, display 5, GPRS wireless communication module 6 and printer 7, described multiple parallel front-end collection unit holds communication unit 4 to be connected by local module 3 with station, described station end communication unit 4 also respectively with display 5, GPRS wireless communication module 6 is connected with printer 7, described local module 3 is connected with power-frequency voltage signal gathering unit 8, in the utility model, described front-end collection unit comprises zero-flux current transformer 1 and terminal module 2, it is connected in series that described zero-flux current transformer 1 and terminal module 2 use optical fiber to carry out, the terminal module 2 of described front-end collection unit is connected with local module 3, first, carry out precise synchronization sampling by the zero-flux current transformer 1 being located at monitored capacitive apparatus other, detect the current signal over the ground produced in capacitive apparatus, and by optical cable output detections signal, zero-flux current transformer 1 arranges one or more at each capacitive apparatus capacitance plate extension line place, forms several sampling or sense channels.Secondly, terminal module 2 is arranged near capacitive apparatus body, is connected with zero-flux current transformer 1 by fibre circuit, while and gather, nurse one's health capacitive apparatus that zero-flux current transformer 1 transmits current signal convert digital signal to over the ground.
As shown in Figure 2, described terminal module 2 comprises terminal A/D analog-digital commutator 20, terminal photoelectric conversion device 21 and terminal digital signals are encoded and decoding device 22, all parts primary responsibility in terminal module 2 connects and processes the data communication between zero-flux current transformer 1 and local module 3, data identification, the detection signal that transmits is received through analog to digital conversion from the output optical cable of zero-flux current transformer 1, opto-electronic conversion and Signal coding and transmission, each terminal module 2 can collect the signal after three tunnel conversions simultaneously, the signal output part of described terminal module 2 is connected and transmission information with local module 3 by bidirectional cable, wherein, the phototiming start pulse signal that a road optical fiber is sampled for transmitting terminal A/D analog-digital commutator (simulating signal and digital signal), terminal module 2 carries out each Channel Synchronous collection after receiving optical pulse synchronization trigger pip, another road optical fiber is used for the data communication between terminal module 2 and local module 3, the collection of local module 3 primary responsibility, the voltage of conditioning capacitive apparatus, current signal convert digital signal to over the ground, it is light signal that the sampled result of terminal module 2 carries out opto-electronic conversion on the spot, by data optical fiber transfer to local module 3 then send into station end communication unit 4 carry out analyzing and processing, terminal module 2 is arranged near capacitive apparatus body, zero-flux current transformer 1 is directly installed on capacitive apparatus body, so that zero-flux current transformer 1 obtains data, simultaneously short-distance transmission at utmost can evade the interference under forceful electric power environment.
In the utility model, described local module 3 comprises local A/D analog-digital commutator, local photoelectric conversion device, local digital signal coding and decoding device, local driving circuit, local laser instrument and data synchronization unit and signal processor are formed, be responsible for connecting and the data communication for the treatment of stations end communication unit 4 and local module 3, data identification, exported and receiving terminal module 2 derived signals by bidirectional cable, now, local module 3 is responsible for doing synchronous and relevant merging treatment to the signal that each terminal module 2 transmits, and hold communication unit 4 to carry out data communication by network interface and station.
Described power-frequency voltage signal gathering unit 8 adopts DSP-TMS320LF2407 chip at a high speed, bus voltage signal is gathered in transformer station through the voltage signal of digital servo-control for following the tracks of, when rising edge also can be produced at system voltage zero crossing, carried out the voltage signal of real-time analysis process generation by dsp chip, and then send into local module 3 and carry out Treatment Analysis; In the utility model, described station end communication unit 4 adopts the IPC-611 industrial computer series of 4U formula, standardization, unitized integrated architecture problem can need be realized for online monitoring data, adopt Unify legislation, Unified coding, unified storage, the complicacy of effective reduction data statement, standard format is derived in supported data virtual view, support simultaneously, with province net level monitoring and warning center Seamless integration-, the efficiency that monitoring, diagnosing, data storage, compare of analysis, status poll and measured value are uploaded greatly can be improved.Standing end communication unit 4 communication system must complete compatible DL/T860 (IEC61850) 8-1 standard.Described station end communication unit 4 receives by optical cable the information that local module 3 transmits, the electric current of each road capacitive apparatus, voltage monitoring signal are analyzed, convert out the dielectric loss of each equipment, capacitance, and carry out Data Comparison, displaying, printing and storage, measured value after end communication unit 4 compare of analysis of station, spectrogram can be sent to display 5 and show, can also be printed by printer 7, and send alarm message breath by GPRS wireless communication module 6, caution device operation maintenance personnel.
As shown in Figure 3, zero-flux current transformer 1 comprises winding 100, Secondary Winding 102, first iron core 103, second iron core 104, a compensative winding 105 and detects winding 106, one end of described first iron core 103 and the mutual occlusal contact condition in one end of the second iron core 104, a described winding 100 and Secondary Winding 102 are simultaneously around the first iron core 103 and the second 104 mutual occlusal contact condition places unshakable in one's determination, described compensative winding 105 lap wound is at the other end of the first iron core 103, and described detection winding 106 is around the other end of the second iron core 104; One end of described first iron core 103 is identical with the length of the second iron core 4, and the length of the first iron core 103 and the second 104 mutual occlusal contact conditions unshakable in one's determination is 1/2nd of respective length; Being connected in parallel high resistant load Rs at the tap input end of described Secondary Winding 102, by connecting excitation current source 107 at compensative winding 105 two ends, because the impedance of high resistant load Rs own load is large, therefore its winding current produced can being ignored; By connecting excitation current source 107 at compensative winding 105 two ends, namely excitation current source 107 is the controllable AC voltage source identical with primary current frequency, because the impedance of high resistant load Rs own load is large, therefore its winding current produced can be ignored, do not produce magnetic flux, when regulating the excitation current source of compensative winding 105, when high resistance voltmeter 108 reading of detection winding 106 goes to zero, the magnetic flux in the second iron core 104 also goes to zero.
As shown in Figure 4, intercoupled by magnetic energy between winding and Secondary Winding, the equivalent electrical circuit of zero-flux current transformer 1 can be obtained, adopt T-shaped equivalent electrical circuit, I for one time of zero-flux current transformer 1
1for zero-flux current transformer 1 primary side current (measured electric current); Z
1be primary circuit impedance, comprise leakage reactance and winding internal resistance; I
2for secondary side current, Z
2be secondary circuit impedance, comprise leakage reactance and the internal resistance of Secondary Winding equally; Z ' is compensating impedance; Z
mfor detecting impedance, I
0for exciting curent; As shown in Figure 5, the profile of zero-flux current transformer 1 adopts the design of punching structure, and the aperture Φ in the middle part of structure is 30 millimeters; It changes with the principle of work monitoring current of electromagnetic coupled, does not namely have electrical communication between winding and Secondary Winding one time, only has magnetic to contact.
As most preferred embodiment of the present utility model, display 5 shows capacitive apparatus monitor value, such as electric current, voltage etc., and draws dielectric loss value, the electric capacity of equipment as calculated afterwards; Printer 7 prints the capacitive apparatus insulated performance data curve map in section sometime, such as dielectric loss value, electric capacity etc.; GPRS wireless communication module 6 timed sending monitoring and warning short message is to the personal communications terminal (mainly mobile phone) of equipment operation maintenance personnel, and such as capacitive apparatus electric capacity, dielectric loss etc. exceed the data of demand value.
Composition graphs 1, Fig. 2, Fig. 3 and Fig. 4, be further elaborated principle of work of the present utility model below:
1). zero-flux current transformer 1 is installed on capacitive apparatus extension line place, the body down conductor place of such as sleeve of main transformer, voltage transformer (VT), current transformer or coupling condenser, and by down conductor through ground connection after zero-flux current transformer 1 middle aperture, such as: the down conductor place three zero-flux current transformers being installed on respectively a high voltage side of transformer sleeve A, B, C phase;
2). the electric potential difference that the inner exciting curent of zero-flux current transformer 1 high speed detection of dynamic mutual inductor produces, when electric potential difference level off to zero time, namely magnetic flux in iron core is approximately Zero flux, if detected value departs from permissible value, then compensated by active automatic high speed adjustment, iron core can be remained at and approach Zero flux state, namely be, by the low current sensor based on active Zero flux technology, mobile equilibrium electronic circuit is adopted to carry out dynamic conditioning, iron core is in " dynamic zero magnetic flux state " all the time, greatly can improve the accuracy that the micro-current signal of capacitive apparatus is measured.
3). be arranged on by terminal module 2 near capacitive apparatus side, be responsible for voltage signal, the over the ground current signal of acquiring and processing device and convert digital signal to, each terminal module 2 can gather three road voltage or current signals simultaneously.Such as: terminal module 2 gathers a high voltage side of transformer sleeve A, the voltage of B, C three-phase and current signal simultaneously;
4). local module 3 is arranged in the monitor screen cabinet of central control room, is responsible for doing synchronous merging treatment to the signal that each terminal module 2 transmits; And by through optical cable, the Monitoring Data after process is held communication unit 4 by network interface teletransmission to station, because optical cable is not by strong electromagnetic radio frequency and the superpotential interference that is coupled in transformer station, and channel bit error rate is low; Therefore can communication quality be ensured;
5). the data after local module 3 processes are by the direct current signal needed for two fine bidirectional cable teletransmission to station end communication unit 4, realize between I/O/power supply mutually isolated, eliminate ground circuit, reduce interference, and there is signal circuit protection and electric current crest inhibiting effect, the station end communication unit 4 in substation central pulpit is transferred to through two fine bidirectional cable;
6). power-frequency voltage signal gathering unit 8 is arranged in substation relay protection indoor main transformer observing and controlling cabinet, after collecting system side voltage signal, inputs in local module 3 and carry out Treatment Analysis;
7). end communication unit 4 of standing can store for the online monitoring data employing Unify legislation of each capacitive apparatus, Unified coding, unification, effectively reduces data characterization complicacy, and supports the displaying of historical data changing trend diagram, support derivation and print; Simultaneously, adopt the advanced technical finesse online monitoring data such as data warehouse, magnanimity packing, and by GPRS wireless communication module 6 transmission state warning information in real time, be sent to the personal communications terminal (mainly mobile phone) of equipment operation maintenance personnel, analyze, grasp device interior insulation degradation situation, the response efficiency of lifting means emergency disposal;
8). equipment O&M operator on duty carries out analyzing and diagnosing by display 5 to the monitor signal that each collector is uploaded in time after receiving monitoring and warning short message prompt, and use where necessary printer 7 print current and historical data for hold diagnostic analysis can, to formulate emergency trouble shooting measures;
9). continue to monitor the dielectric features parameter of capacitive apparatus for a long time, can Timeliness coverage equipment latency defect, reduce power outage, improve equipment, electric power netting safe running level.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; allly to use within novel spirit and principle at this, any amendment done, equivalent replacement, improvement etc., within the protection domain that all should be included in utility model.
Claims (6)
1. one kind based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: comprise the front-end collection unit that several are parallel, local module (3), stand and hold communication unit (4), power-frequency voltage signal gathering unit (8), display (5), GPRS wireless communication module (6) and printer (7), described multiple parallel front-end collection unit holds communication unit (4) to be connected by local module (3) with station, described station end communication unit (4) also respectively with display (5), GPRS wireless communication module (6) is connected with printer (7), described local module (3) is connected with power-frequency voltage signal gathering unit (8).
2. according to claim 1 a kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: described front-end collection unit comprises zero-flux current transformer (1) and terminal module (2), it is connected in series that described zero-flux current transformer (1) and terminal module (2) use optical fiber to carry out, and the terminal module (2) of described front-end collection unit is connected with local module (3).
3. according to claim 2 a kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: described terminal module (2) comprises terminal A/D analog-digital commutator (20), terminal photoelectric conversion device (21) and terminal digital signals coding and decoding device (22), described zero-flux current transformer (1) is connected with local module (3) by terminal A/D analog-digital commutator (20), terminal photoelectric conversion device (21), terminal digital signals coding and decoding device (22) successively.
4. according to claim 1 a kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: described power-frequency voltage signal gathering unit (8) adopts high-speed dsp-TMS320LF2407 chip.
5. according to claim 1 a kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: described station end communication unit (4) adopts the IPC-611 industrial computer series of 4U formula.
6. according to claim 2 a kind of based on bus distributed capacitive apparatus insulated characteristic monitoring system, it is characterized in that: described zero-flux current transformer (1) employing aperture is the punching structure of 30 millimeters, described zero-flux current transformer (1) comprises a winding (100), Secondary Winding (102), first iron core (103), second iron core (104), compensative winding (105) and detection winding (106), one end of described first iron core (103) and the mutual occlusal contact condition in one end of the second iron core (104), the while of a described winding (100) and Secondary Winding (102), lap wound is at the first iron core (103) and the second iron core (104) occlusal contact condition place mutually, described compensative winding (105) is around the other end of the first iron core (103), described detection winding (106) is around the other end of the second iron core (104).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501689A (en) * | 2016-11-03 | 2017-03-15 | 国网重庆市电力公司北碚供电分公司 | A kind of distributed capacitive apparatus insulated electrification detection system |
| CN110470963A (en) * | 2019-09-24 | 2019-11-19 | 云南电网有限责任公司红河供电局 | A kind of high voltage capacitive apparatus insulated performance on-line monitoring device based on DSP |
| CN113394013A (en) * | 2021-05-18 | 2021-09-14 | 周龙珍 | Intelligent voltage transformer |
| WO2023231578A1 (en) * | 2022-05-31 | 2023-12-07 | 国网信息通信产业集团有限公司 | Analog quantity acquisition method and device |
-
2015
- 2015-07-09 CN CN201520490592.XU patent/CN204855663U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501689A (en) * | 2016-11-03 | 2017-03-15 | 国网重庆市电力公司北碚供电分公司 | A kind of distributed capacitive apparatus insulated electrification detection system |
| CN110470963A (en) * | 2019-09-24 | 2019-11-19 | 云南电网有限责任公司红河供电局 | A kind of high voltage capacitive apparatus insulated performance on-line monitoring device based on DSP |
| CN113394013A (en) * | 2021-05-18 | 2021-09-14 | 周龙珍 | Intelligent voltage transformer |
| WO2023231578A1 (en) * | 2022-05-31 | 2023-12-07 | 国网信息通信产业集团有限公司 | Analog quantity acquisition method and device |
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