CN204495952U - A kind of low and medium voltage distribution network simulation system based on energy back - Google Patents
A kind of low and medium voltage distribution network simulation system based on energy back Download PDFInfo
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- CN204495952U CN204495952U CN201520147845.3U CN201520147845U CN204495952U CN 204495952 U CN204495952 U CN 204495952U CN 201520147845 U CN201520147845 U CN 201520147845U CN 204495952 U CN204495952 U CN 204495952U
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Abstract
The utility model discloses a kind of low and medium voltage distribution network simulation system based on energy back, it comprises input incoming line cabinet, input incoming line cabinet is connected with step-up transformer wire, step-up transformer is connected with high-pressure gauge scale wire, high-pressure gauge scale is connected with the first cable analogue means wire, first cable analogue means is connected with step-down transformer wire, step-down transformer is connected with the second cable analogue means wire, second cable analogue means is connected with low-pressure line-outgoing cabinet wire, low-pressure line-outgoing cabinet is connected with electronic load wire, electronic load is connected with isolating transformer wire, solve in prior art and there is no special saving energy and decreasing loss system energy efficiency real-time monitoring, in electric equipment test, the mode that load often adopts RLC impedance load case to carry out energy consumption electric discharge is carried out, measuring accuracy is low, waste of energy is serious, load be difficult to the continuous regulating power of satisfied different operating mode, power cause device aging compared with little Yi and burn, the problem such as poor heat stability, its load form are single.
Description
Technical field
The utility model belongs to electron electric power and technical field of power systems, particularly relates to a kind of low and medium voltage distribution network simulation system based on energy back.
Background technology
At present, still be in the stage of fumbling to the construction of low and medium voltage distribution network saving energy and decreasing loss technology experiment room, not yet set up saving energy and decreasing loss efficiency Real-Time Monitoring platform, real-time energy efficiency evaluation and test cannot be carried out to electrical equipment, namely analyze various factors to electrical equipment power consumption or the impact of energy-efficient equipment energy-saving effect; Simultaneously, because saving energy and decreasing loss aspect does not have special technical support, cannot for line loss, idle work optimization, the quality of power supply, three-phase imbalance, transformer economic operation, new forms of energy access etc. about electrical network saving energy and decreasing loss field provides technical research platform and efficiency evaluation and test platform, thus just cannot detect for saving energy and decreasing loss standardize organization, the assessment of networking energy-efficient equipment, the checking of engineering energy-saving effect, the work such as energy-saving consulting and diagnosis service be carried out provides theory and data supporting; The key of electrical equipment efficiency evaluation and test is the energy consumption effect of monitoring equipment under various load or operating condition, and in common electric equipment test, the mode that load often adopts RLC impedance load case to carry out energy consumption electric discharge is carried out, this method not only measuring accuracy is low, and cause the huge waste of electric energy, and there is following shortcoming:
One, load adopts has level to regulate, and when needs resistance value consecutive variations or its load form change flexibly, is difficult to meet the requirement that electrical equipment regulates continuously to different operating mode; Two, power is less, under long-time cranking test environment, easily cause the aging of device and scaling loss; Three, poor heat stability, when the environmental temperature is changed, load also can change; Four, its load form is single, can not meet in electric equipment test the requirement that load capacity, power factor, tri-phase unbalance factor and harmonic wave etc. dynamically regulate continuously; Five, test power consumption on resistance, cause huge energy dissipation.
Utility model content
The technical problems to be solved in the utility model: a kind of low and medium voltage distribution network simulation system based on energy back is provided, special saving energy and decreasing loss system energy efficiency real-time monitoring is not had to solve in prior art, in electric equipment test, the mode that load often adopts RLC impedance load case to carry out energy consumption electric discharge is carried out, this method not only measuring accuracy is low, waste of energy is serious, load adopt have level to regulate to be difficult to the continuous regulating power of satisfied different operating mode, power to cause device aging compared with little Yi and burn, the technical matters such as poor heat stability, its load form are single.
Technical solutions of the utility model:
A kind of low and medium voltage distribution network simulation system based on energy back, it comprises input incoming line cabinet, input incoming line cabinet is connected with step-up transformer wire, step-up transformer is connected with high-pressure gauge scale wire, high-pressure gauge scale is connected with the first cable analogue means wire, first cable analogue means is connected with step-down transformer wire, step-down transformer is connected with the second cable analogue means wire, second cable analogue means is connected with low-pressure line-outgoing cabinet wire, low-pressure line-outgoing cabinet is connected with electronic load wire, and electronic load is connected with isolating transformer wire.
Input incoming line cabinet comprises master switch, master switch end of incoming cables connects electrical network inlet wire, leading-out terminal is connected with the end of incoming cables of input contactor, and the leading-out terminal of input contactor and induction voltage regulator winding switching, the Secondary Winding of induction voltage regulator is connected with output contactor end of incoming cables.
The impedor that first cable analogue means comprises more than two is composed in series, and the two ends of each impedor are parallel with an impedance contact device.
The impedor that second cable analogue means comprises more than two is composed in series, and the two ends of each impedor are parallel with an impedance contact device.
Described electronic load is single-phase electronic load, each single-phase electronic load comprises load-side transverter and can present side transverter, load-side transverter with can present side transverter all adopt open up mend structure identical single phase full-bridge PWM circuit composition, and with DC bus Support Capacitor for Connection Element, the brachium pontis of single-phase electronic load is provided with extension line.
Low-pressure line-outgoing cabinet comprises low-pressure gage scale, Power Quality Detection terminal and outlet switch.
It also comprises Systematical control main website, and Systematical control main website is connected with high-pressure gauge scale, low-pressure gage scale, Power Quality Detection terminal, the first cable analogue means, the second cable analogue means and electronic load respectively.
It also comprises regulator controller, regulator controller and induction voltage regulator and input contactor wire and be connected.
Systematical control main website is connected by Ethernet with Power Quality Detection terminal, Systematical control main website is connected by USB/ optical fiber change-over panel with high-pressure gauge scale, and Systematical control main website is connected by RS485/232 transition card with low-pressure gage scale, the first cable analogue means, the second cable analogue means and electronic load.
It also comprises current transformer, power network current mutual inductor is connected with in input contactor end of incoming cables, input current transformer is connected with in output contactor end of incoming cables, be connected with first in step-up transformer end of incoming cables and can present side current transformer, be connected with load-side current transformer at every phase output terminal of low-pressure line-outgoing cabinet leading-out terminal, be connected with at electronic load leading-out terminal and can present side current transformer.
The beneficial effects of the utility model:
The low and medium voltage distribution network simulation system based on energy back that the utility model is set up, the line impedance under the different line length of low and medium voltage distribution network and Medial & Low Voltage Power Network voltage fluctuation situation can be simulated, use can present loadtypes different in the electronic load simulation low-voltage network of type, establish power distribution network primary equipment efficiency test analysis platform, different loads condition can be analyzed, harmonic environment, tri-phase unbalance factors etc. are on the impact of power distribution network primary equipment efficiency, obtain the energy consuming curve of various electrical equipment, set up electric equipment test database, exploitation for novel low power consuming controller switching equipment has to be instructed and practical value preferably, the utility model can in order to evaluate and test various practical application or new distribution equipment simultaneously, the energy consumption parameter of consumer and measuring equipment, for formulating controller switching equipment, consumer, the permit standard of measuring equipment, set up the planning eliminating carbon isotopes, management system and management method etc. provide theoretical foundation and test figure, there is very important directive significance and promotional value, the utility model solves in prior art does not have special saving energy and decreasing loss system energy efficiency real-time monitoring, in electric equipment test, the mode that load often adopts RLC impedance load case to carry out energy consumption electric discharge is carried out, this method not only measuring accuracy is low, waste of energy is serious, load adopts has level adjustment to be difficult to the continuous regulating power of satisfied different operating mode, power comparatively little Yi causes device aging and burns, poor heat stability, the technical matterss such as its load form is single.
accompanying drawing illustrates:
Fig. 1 is that the utility model structural system forms schematic diagram;
Fig. 2 is the utility model communication modes structural representation;
Fig. 3 is the utility model first cable analogue means structural representation;
Fig. 4 is the utility model second cable analogue means structural representation;
Fig. 5 is the utility model electronic load structural representation;
Fig. 6 is the utility model three-phase four-wire system electronic load structural representation.
embodiment:
A kind of low and medium voltage distribution network simulation system based on energy back, it comprises (see figure 1) input incoming line cabinet, input incoming line cabinet is connected with step-up transformer wire, step-up transformer is connected with high-pressure gauge scale wire, high-pressure gauge scale is connected with the first cable analogue means wire, first cable analogue means is connected with step-down transformer wire, step-down transformer is connected with the second cable analogue means wire, second cable analogue means is connected with low-pressure line-outgoing cabinet wire, low-pressure line-outgoing cabinet is connected with electronic load wire, and electronic load is connected with isolating transformer wire.
Input incoming line cabinet comprises master switch, master switch end of incoming cables connects electrical network inlet wire, leading-out terminal is connected with the end of incoming cables of input contactor, and the leading-out terminal of input contactor and induction voltage regulator winding switching, the Secondary Winding of induction voltage regulator is connected with output contactor end of incoming cables.
The leading-out terminal of output contactor connects a winding of step-up transformer, the Secondary Winding of step-up transformer connects the end of incoming cables of high-pressure gauge scale, the leading-out terminal of high-pressure gauge scale connects the end of incoming cables of the first cable analogue means, the leading-out terminal of the first cable analogue means connects a winding of step-down transformer, the Secondary Winding of step-down transformer connects the end of incoming cables of the second cable analogue means, the leading-out terminal of the second cable analogue means connects the end of incoming cables of low-pressure line-outgoing cabinet, low-pressure gage scale is provided with in low-pressure line-outgoing cabinet, for the Power Quality Detection terminal of the electric parameter in real-time detection line, the leading-out terminal of low-pressure line-outgoing cabinet is divided into A phase by outlet switch, B phase, C phase exports, and connect the end of incoming cables of a wherein single-phase electronic load separately, the leading-out terminal of three single-phase electronic loads connects a winding of a wherein single-phase isolating transformer separately, the Secondary Winding of three single-phase isolating transformers is connected to the leading-out terminal of output contactor in the lump.
It also comprises Systematical control main website, and Systematical control main website is connected with high-pressure gauge scale, low-pressure gage scale, Power Quality Detection terminal, the first cable analogue means, the second cable analogue means and electronic load respectively; Systematical control main website receives and detects data to carry out fail-safe analysis and efficiency test, Systematical control main website is connected by Ethernet with Power Quality Detection terminal, Systematical control main website is connected by USB/ optical fiber change-over panel with high-pressure gauge scale, Systematical control main website is connected (see figure 2) with low-pressure gage scale, the first cable analogue means, the second cable analogue means and electronic load by RS485/232 transition card, Systematical control main website is system control panel, groundwork comprises: (1) is realized systematically controlling by main website, monitoring; (2) the system electrical parameter that in receiving system, device transmission is come is to carry out reliability and system energy consumption analysis acquisition operation curve, the data such as energy consumption curve, display system running parameter, duty; (3) sending system control runs parameter processed; (4) initialization system running parameter, protection act parameter.
It also comprises regulator controller, regulator controller and induction voltage regulator and input contactor wire and be connected.
It also comprises current transformer, power network current mutual inductor is connected with in input contactor end of incoming cables, input current transformer is connected with in output contactor end of incoming cables, be connected with first in step-up transformer end of incoming cables and can present side current transformer, be connected with load-side current transformer at every phase output terminal of low-pressure line-outgoing cabinet leading-out terminal, be connected with at electronic load leading-out terminal and can present side current transformer.
First cable analogue means and the second cable analogue means are connected in series successively by the impedor that plural equiva lent impedance is different and form, an impedance contact device is connected in parallel at the two ends of each impedor, disconnect by impedance contact device is closed, selectivity controls in different impedor line attachment, and different resistance values represents different line length to realize the simulation to different line length.
Single-phase electronic load adopts AC-DC-AC structure, its work structuring mainly comprises load-side transverter, side transverter and DC bus Support Capacitor can be presented, load-side transverter mainly realizes being direct current (AC-DC) by grid side AC rectification, the unidirectional full bridge PWM circuit that load-side transverter is identical with presenting side transverter employing topological structure, can present side transverter mainly realize by the rectification of load-side transverter come DC inverter feed back to electrical network, load-side transverter and side transverter can be presented adopt back to back structure, between two transverters with DC bus Support Capacitor for Connection Element, wherein, the single-phase full bridge PWM rectification circuit connecting low-pressure line-outgoing cabinet is the load-side transverter of single-phase electronic load, the single-phase full bridge PWM rectification circuit connecting single-phase isolating transformer is the energy feedback side transverter of single-phase electronic load.
The brachium pontis of single-phase electronic load is provided with extension line, and for making three single-phase electronic loads and tested electrical equipment realize, single-phase-two-wire system is connected this extension line, three-phase three-wire system connects or three-phase four-wire system connects.
Operationally, master switch closes, the length of cable of the low and medium voltage distribution network that the first cable analogue means and the second cable analogue means will be simulated is set by Systematical control main website, then the output using regulator controller to control induction voltage regulator reaches certain voltage value, can complete the simulation to low and medium voltage distribution network; For the voltage fluctuation situation of low and medium voltage distribution network, can be realized by the output using regulator controller to control induction voltage regulator.
The working method presenting the electronic load (single-phase electronic load) of type is controlled by Systematical control main website, the simulation of electronic load to continuous current, invariable power, constant-impedance three kinds of loads can be realized, when simulating continuous current load, the present embodiment can be less than or equal to 280A to electric current, 280A is equipment maximum operating currenbt, rated current is 145A, and the overcurrent protection electric current of setting is usually the scope of 160A, power factor realizes continuously adjustabe in the scope of 0 to 1; When simulating constant power load, the independent setting to load active power and reactive power, simulation can be realized, and realize the load simulation of single-phase 0 ~ 64kVA scope; When simulating constant-impedance load, can realize resistance, emotional resistance, the independent setting of capacitive reactances, simulation.Under any operating mode, the feedback net power factor of the low and medium voltage distribution network simulation system based on energy back of the present utility model is all more than 0.98; Feedback net current harmonics resultant distortion rate (THD) is less than 5%; During the simulation pure resistance load of rated power, efficiency is greater than 92%.
When the utility model is tested electrical equipment, only before work, the outlet switch of tested electrical equipment with low-pressure line-outgoing cabinet need be connected, then arrange system operational parameters by Systematical control main website to test this electrical equipment, after being completed, Systematical control main website can complete fail-safe analysis and the efficiency test of device under test, and fail-safe analysis and efficiency test are accurately, and precision is high.
The utility model relates to single-phase electronic load, high-pressure gauge scale, low-pressure gage scale, Power Quality Detection terminal, the first cable analogue means and the data communication between the second cable analogue means and Systematical control main website in operational process, the utility model adopts large-scale parallel communications processing, ensure that ageing, the accuracy of data acquisition and the accurate execution of control command.Particularly, adopt multi-protocols (to comprise Modbus in the utility model simultaneously, 645, the communications protocol such as 376), many communication modes integration technology (comprises 232, the communication modes such as 485 and TCP/IP), and system is effectively to multi-protocols, many communication modes are integrated, can be accurate in non-interfering situation, stable collection and preservation test data, wherein Systematical control main website adopts Ethernet card and Power Quality Detection terminal to carry out data communication, use RS232 expansion board connect RS485/232 transform card respectively with single-phase electronic load, low-pressure gage scale, first cable analogue means and the second cable analogue means carry out data communication, optical fiber/USB is used to communicate with high-pressure gauge scale.
Hardware circuit of the present utility model can be made up of parts such as human-computer interaction interface, dsp controller, Systematical control main website, display communication circuit and main circuits, and main circuit directly bears the conversion of electric energy; Dsp controller is control core with TMS320F28335, mainly comprises: CPU and peripheral circuit, signal sampling and modulate circuit, driving circuit and protection circuit; Wherein, signal sampling and conditioning unit mainly complete strong and weak electricity isolates, and level conversion and signal amplify and the function such as filtering, to meet the requirement of dsp controller to each road signal level range and signal quality.Human-computer interaction interface can adopt embedded integrated touch-screen.
In the present embodiment, first cable analogue means (see figure 3) has the dissimilar equiva lent impedance of 0.5km, 1.5km, 3km, 5km tetra-kinds, and by each impedance contact device (KM1-KM5) under different closed and disconnected states, combine 16 kinds of working methods, thus the 10kV cable of different length can be simulated; During design, analog cable is chosen as the 50mm of 10kV
2aluminium core three core power cable with cross-linked polyethylene insulation, its unit kilometer resistance is 0.641 Ω, and unit kilometer reactance is 0.1196 Ω.
(see figure 4) in the present embodiment, there are 50m, 100m, 100m tri-sections of equiva lent impedances on the second every loop line road of cable analogue means, by the duty of the impedance contact device (KM10-KM70) on selecting every section, form different equiva lent impedance array modes, similar with the first cable analogue means, the 400V cable of different length can be simulated; During design, analog cable is chosen as the 120mm of 400V
2copper cash, its positive-negative sequence resistance is 0.008 Ω/50m, positive-negative sequence reactance is 0.0035 Ω/50m, zero sequence resistance is 0.01 Ω/50m, zero-sequence reactance is 0.005 Ω/50m.
See Fig. 5, for single-phase electronic load, adopt single-phase full bridge PWM(Voltage Source Rectifer, be called for short VSR) as the simulation transverter of the electrical load side of single-phase electronic load and grid-connected transverter, connected the energy feedback side of single-phase electronic load by DC bus Support Capacitor, form the main circuit topological structure of back-to-back type, the circuit of its single-phase electronic load is as Fig. 5, in figure
for the main switching device of electronic load side transverter,
as the input inductance of electronic load side;
as the main switching device of the transverter of energy feedback side,
as the outputting inductance of energy feedback side transverter;
for DC bus Support Capacitor.When working in electronic load side, DC bus-bar voltage is constant, and input, output power are carried out exchanging and reaching balance at this.Energy feedback side is provided with transverter isolating transformer IT1, guarantee electronic load side and electrical network electrical isolation, the three-phase four-wire system Connection Mode formed for 3 single-phase electronic loads on the one hand provides return passage at primary side, also can avoid because tested power supply is the electric short circuit situation that non-isolated power supply may cause on the other hand.
See Fig. 6, the utility model adopts single-phase full bridge structure to be as the reason of the circuit topology of electronic load, the transverter of electronic load is carried out proper transformation and connects going for the single-phase of electric distribution network electrical equipment equally, the test of three-phase symmetrical and asymmetric load, and not by the impact of tested power supply line type, go for single-phase-two-wire, the various application occasions such as three-phase three-wire system or three-phase four-wire system, three-phase is separate, conveniently carry out three-phase imbalance experiment, concrete line graph as shown in Figure 6, corresponding three-phase three-wire system Connection Mode, a single-phase electronic load is a phase, phase one point, three equipment are linked to be three-phase, three-phase neutral point connects together formation, load balance, only need by the extension line short circuit on single-phase electronic load brachium pontis, and corresponding three-phase four-wire system, the n point on the extension line of electronic load side converter bridge arm is needed to be connected with tested power supply center line, if in order to simulate uncompensated load, the short circuit joint N point of isolating transformer IT (1-3) must be connected with electrical network center line, three-phase system solution lotus root becomes monophase system, independent control.Therefore system can carry out various balance or uncompensated load examination experiment flexibly.The present embodiment in order to both simulate three-phase equilibrium test and three-phase imbalance test, and adopts the three-phase four-wire system mode of connection; If power system capacity is not enough, parallel way also can be adopted to be connected to the output terminal of tested power supply, carry out the fully loaded experiment of system or various dynamic experiment flexibly by Systematical control main website.
Systematical control main website first can complete operations such as system communication module installation, display panel configurations, Real-Time Monitoring, data processing, system management, Operation system setting, during operation, Systematical control main website accepts the data from high-pressure gauge scale, low-pressure gage scale, Power Quality Detection terminal and system CPU, the i.e. electric parameter of system different parts, as voltage, electric current, phase place, power etc., thus real-time display system work state information, simultaneously can to system CPU transmitting system steering order, the duty of control system.Simultaneously, Systematical control main website is power distribution network primary equipment efficiency test analysis platform, analysis on the impact of power distribution network primary equipment efficiency, obtains the energy consuming curve of various consumer, apparatus for establishing experimental data base at different loads condition, harmonic environment, tri-phase unbalance factor.
The utility model provides by arranging the first cable analogue means and the second cable analogue means, the line impedance under the different line length of low and medium voltage distribution network can be simulated, regulator controller is used to control the output of induction voltage regulator, Medial & Low Voltage Power Network voltage fluctuation situation can also be simulated, and use loadtypes different in the electronic load simulation low-voltage network presenting type, establish power distribution network primary equipment efficiency test analysis platform, different loads condition can be analyzed, harmonic environment, tri-phase unbalance factors etc. are on the impact of power distribution network primary equipment efficiency, obtain the energy consuming curve of various electrical equipment, set up electric equipment test database, exploitation for novel low power consuming controller switching equipment has to be instructed and practical value preferably.
Claims (10)
1. the low and medium voltage distribution network simulation system based on energy back, it comprises input incoming line cabinet, it is characterized in that: input incoming line cabinet is connected with step-up transformer wire, step-up transformer is connected with high-pressure gauge scale wire, high-pressure gauge scale is connected with the first cable analogue means wire, first cable analogue means is connected with step-down transformer wire, step-down transformer is connected with the second cable analogue means wire, second cable analogue means is connected with low-pressure line-outgoing cabinet wire, low-pressure line-outgoing cabinet is connected with electronic load wire, and electronic load is connected with isolating transformer wire.
2. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, it is characterized in that: input incoming line cabinet comprises master switch, master switch end of incoming cables connects electrical network inlet wire, leading-out terminal is connected with the end of incoming cables of input contactor, the leading-out terminal of input contactor and induction voltage regulator winding switching, the Secondary Winding of induction voltage regulator is connected with output contactor end of incoming cables.
3. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, is characterized in that: the impedor that the first cable analogue means comprises more than two is composed in series, and the two ends of each impedor are parallel with an impedance contact device.
4. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, is characterized in that: the impedor that the second cable analogue means comprises more than two is composed in series, and the two ends of each impedor are parallel with an impedance contact device.
5. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, it is characterized in that: described electronic load is single-phase electronic load, each single-phase electronic load comprises load-side transverter and can present side transverter, load-side transverter with can present side transverter all adopt open up mend structure identical single phase full-bridge PWM circuit composition, and with DC bus Support Capacitor for Connection Element, the brachium pontis of single-phase electronic load is provided with extension line.
6. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, is characterized in that: low-pressure line-outgoing cabinet comprises low-pressure gage scale, Power Quality Detection terminal and outlet switch.
7. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, it is characterized in that: it also comprises Systematical control main website, Systematical control main website is connected with high-pressure gauge scale, low-pressure gage scale, Power Quality Detection terminal, the first cable analogue means, the second cable analogue means and electronic load respectively.
8. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, is characterized in that: it also comprises regulator controller, regulator controller and induction voltage regulator and input contactor wire and be connected.
9. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 7, it is characterized in that: Systematical control main website is connected by Ethernet with Power Quality Detection terminal, Systematical control main website is connected by USB/ optical fiber change-over panel with high-pressure gauge scale, and Systematical control main website is connected by RS485/232 transition card with low-pressure gage scale, the first cable analogue means, the second cable analogue means and electronic load.
10. a kind of low and medium voltage distribution network simulation system based on energy back according to claim 1, it is characterized in that: it also comprises current transformer, power network current mutual inductor is connected with in input contactor end of incoming cables, input current transformer is connected with in output contactor end of incoming cables, be connected with first in step-up transformer end of incoming cables and can present side current transformer, be connected with load-side current transformer at every phase output terminal of low-pressure line-outgoing cabinet leading-out terminal, be connected with at electronic load leading-out terminal and can present side current transformer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655990A (en) * | 2015-03-16 | 2015-05-27 | 贵州电力试验研究院 | Medium and low-voltage power distribution network simulation system based on energy feedback |
| CN112698065A (en) * | 2020-12-04 | 2021-04-23 | 国网上海能源互联网研究院有限公司 | Circuit equipment for serially connecting AC/DC analog impedance |
-
2015
- 2015-03-16 CN CN201520147845.3U patent/CN204495952U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655990A (en) * | 2015-03-16 | 2015-05-27 | 贵州电力试验研究院 | Medium and low-voltage power distribution network simulation system based on energy feedback |
| CN112698065A (en) * | 2020-12-04 | 2021-04-23 | 国网上海能源互联网研究院有限公司 | Circuit equipment for serially connecting AC/DC analog impedance |
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