CN110927420B - Current and voltage regulation and control system for feeder automation test - Google Patents
Current and voltage regulation and control system for feeder automation test Download PDFInfo
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a current and voltage regulation and control system for feeder automation test, which comprises a power supply unit, a power supply unit and a power supply unit, wherein the power supply unit comprises a voltage energy transmission module and a current input port, the voltage energy transmission module is used for inputting voltage and regulating the input voltage, and the current input port is used for inputting voltage required by test current; the response unit is used for converting voltage into test voltage or/and current and outputting the test voltage or/and current to be tested, and is connected with the regulation and control submodule and the current input port of the voltage energy transmission module; the control unit is used for regulating and controlling the response unit according to the instructions transmitted by the communication unit and the conversion unit, and the voltage signal with high precision and high stability and the current signal with high precision and high stability can be provided through the power supply unit, the response unit, the control unit, the communication unit and the conversion unit.
Description
Technical Field
The invention relates to the technical field of feeder automation test systems, in particular to a current and voltage regulation and control system for feeder automation test.
Background
With the rapid development of urban power grid construction, the important role played by a power distribution automation system in the safe and reliable operation of a power grid is increasingly prominent; the core function of the distribution automation system is feeder automation aiming at fault location, isolation and power restoration; when a certain point in a distribution network has a fault, the same power supply area can be powered off, and a large-area power failure can be caused when the situation is serious, so that a feeder automation system needs to cut off the fault area as soon as possible, then the power supply recovery of a non-fault area is completed, the feeder automation system needs to perform various function tests on the feeder automation system before the feeder automation system is actually put into use, a test instrument needs to output alternating current excitation current, the current of the alternating current excitation current is greater than 30A, the load capacity of the alternating current excitation current is greater than 0.2 ohm, the problem that the accuracy of a provided voltage signal and a provided current signal is not high and the stability is weak exists in a target feed-forward line automation test system, and an integrated chip is adopted, so that the noise is high and the adjustment parameters are not flexible.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The invention is provided in view of the problems of low precision and weak stability of the voltage signal and the current signal provided by the current voltage regulation and control system for the existing feeder automation test.
Therefore, the present invention is directed to a current and voltage regulation system for an automatic test of a feeder.
In order to solve the technical problems, the invention provides the following technical scheme: a current and voltage regulation system for feeder automation test comprises,
the power supply unit comprises a voltage energy transmission module and a current input port, wherein the voltage energy transmission module is used for inputting voltage and regulating the input voltage, and the current input port is used for inputting the voltage required by the test current;
the response unit is used for converting voltage into test voltage or/and current and outputting the test voltage or/and current to be tested, and is connected with the regulation and control submodule and the current input port of the voltage energy transmission module; and the number of the first and second groups,
and the control unit is used for regulating and controlling the response unit according to the instructions transmitted by the communication unit and the conversion unit.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: the voltage energy transmission module further comprises a voltage input port, the voltage input port is used for inputting voltage required by test voltage, and the voltage input port is connected with the regulation and control submodule.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: the regulation and control submodule comprises an L6562A and a level conversion chip, wherein the input end of the level conversion chip is connected with the first joint of the voltage input port, the output end of the level conversion chip is connected with the voltage driving module of the response unit, and the input end and the output end of the L6562A are respectively connected with the first joint of the voltage input port and the voltage power amplification module of the response unit.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: and the voltage driving module of the response unit drives the voltage power amplification module to adjust a voltage signal.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: the response unit further comprises a current driving module, a current power amplifier module, a voltage output port and a current output port, wherein the current driving module drives the current power amplifier module to convert voltage into a test current signal and output the test current signal to the tested equipment through the current output port, and the voltage output port is connected with the voltage power amplifier module.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: the input ends of the current quantity control module and the voltage quantity control module of the control unit are connected with the output end of the communication unit and used for automatically switching gears according to the amplitude of the output voltage;
the output end of the current flow control module is connected with the input end of the current driving module;
and the output end of the voltage quantity control module is connected with the input end of the voltage driving module.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: the control unit still includes voltage feedback module, alternating current-direct current switching module and direct current conversion module, the output of voltage feedback module with voltage power amplifier module and direct current conversion module are connected, and its input all is connected with voltage output port and voltage quantity control module's output, alternating current-direct current switching module's output is connected with voltage drive module and is used for switching output alternating current signal still direct current signal.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: and the current mode PT of the conversion unit and the output end of the direct current conversion module are connected with the alternating current and direct current switching module.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: the conversion unit further comprises a waveform input module, a measurement feedback module, an isolation CT, a measurement PT and a measurement CT, wherein the waveform input module is respectively connected with the input ends of the isolation CT and the current type PT, the output end of the isolation CT is connected with the current driving module, and the output ends of the measurement PT and the measurement CT are connected with the measurement feedback module;
the input end of the measuring CT is connected with the current output port and is used for measuring the output current;
and the input end of the measuring PT is connected with the voltage output port and used for measuring the output voltage.
As a preferred embodiment of the current and voltage regulation and control system for feeder automation test of the present invention, wherein: and the light isolation unit of the communication unit is connected with the current measurement control module and the voltage range control module and is used for isolating signals.
The invention has the beneficial effects that: according to the invention, through the power supply unit, the response unit, the control unit, the communication unit and the conversion unit, a high-precision high-stability voltage signal and a high-precision high-stability current signal can be provided, and meanwhile, the response unit adopts an iron cap transistor, so that the test noise is low, the parameters are flexibly adjusted, and the use requirements are met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic view of an overall structure of a current-voltage control system for feeder automation test according to the present invention.
Fig. 2 is a schematic structural diagram of a power supply unit and a response unit of the current-voltage regulation system for feeder automation test according to the present invention.
Fig. 3 is a schematic structural diagram of a control unit of the current-voltage regulation system for feeder automation test according to the present invention.
Fig. 4 is a schematic structural diagram of a conversion unit of the current-voltage regulation system for feeder automation test according to the present invention.
Fig. 5 is a schematic view of an overall detailed structure of the current-voltage control system for feeder automation test according to the present invention.
Fig. 6 is a schematic diagram of a voltage output model of the current-voltage control system for feeder automation test according to the present invention.
Fig. 7 is a schematic view of a current output model of the current-voltage control system for feeder automation test according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Example 1
Referring to fig. 1, an overall structural schematic diagram of a current and voltage regulation and control system for feeder automation test is provided, and as shown in fig. 1, the current and voltage regulation and control system for feeder automation test includes a power supply unit 100 including a voltage energy transmission module 101 and a current input port 102, the voltage energy transmission module 101 is configured to input a voltage and regulate the input voltage, and the current input port 102 is configured to input a voltage required by a test current; the response unit 200 is used for converting voltage into test voltage or/and current and outputting the test voltage or/and current to be tested, and is connected with the regulation and control submodule 101a and the current input port 102 of the voltage energy transmission module 101; and a control unit 300 for regulating the response unit 200 according to the instructions transmitted by the communication unit 400 and the conversion unit 500.
Specifically, the main structure of the present invention includes a power supply unit 100, a response unit 200, a control unit 300, a communication unit 400 and a conversion unit 500, which can provide a high-precision and high-stability voltage signal and a high-precision and high-stability current signal, and the response unit 200 employs an iron-cap transistor, so that the test noise is low and the adjustment parameters are flexible, specifically, the power supply unit 100 includes a voltage energy transmission module 101 and a current input port 102, the voltage energy transmission module 101 is used for inputting voltage and adjusting the input voltage, and the current input port 102 is used for inputting the voltage required by the test current; the response unit 200 is used for converting voltage into test voltage or/and current and outputting the test voltage or/and current to be tested, plays a role of power amplification at the same time, and is connected with the regulation and control submodule 101a and the current input port 102 of the voltage energy transmission module 101; and a control unit 300 for regulating and controlling the response unit 200 according to the instructions transmitted by the communication unit 400 and the conversion unit 500, wherein the conversion unit 500 is used for inputting waveforms, converting the input waveform digital signals into analog signals after DA conversion, and then performing isolated output control.
Further, the voltage energy transmission module 101 further includes a voltage input port 101b, the voltage input port 101b is used for inputting a voltage required by the test voltage, and is connected to the level conversion chip of the regulation and control submodule 101a, wherein the model of the level conversion chip is MP1591, and the regulation and control submodule 101a plays a role in adjusting the voltage input by the voltage input port 101b and realizing automatic adjustment.
Further, as shown in fig. 2, the regulation submodule 101a includes an L6562a101a-1 and a level conversion chip 101a-2, the L6562a101a-1 can automatically adjust the voltage according to the magnitude of the output voltage to reduce the internal power consumption of the power amplifier and reduce heat generation, the L65 6562A is applied to the power factor correction circuit, the level conversion chip 101a-2 can convert the input power generation source into the positive and negative power, the input end of the level conversion chip is connected to the first connector 101b-1 of the voltage input port 101b, the output end of the level conversion chip is connected to the voltage driving module 201 of the response unit 200, the input end of the L6562a101a-1 is connected to the second connector 101b-2 of the voltage input port 101b and the voltage power amplification module 202 of the response unit 200, in this embodiment, the voltage of the DC24V input by the first connector 101b-1 is converted by the level conversion chip to output ± 15, the second connector 101b-2 inputs DC400V voltage and outputs +/-40-400V 50W through L6562A101 a-1.
Example 2
Referring to fig. 2, this embodiment is different from the first embodiment in that: the response unit 200 includes a voltage driving module 201, a voltage power amplifier module 202, a current driving module 203, a current power amplifier module 204, a voltage output port 205, and a current output port 206. Specifically, the voltage driving module 201 of the response unit 200 drives the voltage power amplification module 202 to adjust the voltage signal; the response unit 200 further includes a current driving module 203, a current power amplifier module 204, a voltage output port 205 and a current output port 206, the current driving module 203 drives the current power amplifier module 204 to convert the voltage into a test current signal, and outputs the test current signal to the device to be tested through the current output port 206, and the voltage output port 205 is connected to the voltage power amplifier module 202.
Further, the voltage power amplifier module 202 and the current power amplifier module 204 respectively use an IGBT pair transistor and a TO-3 power pair transistor, where the IGBT is a composite fully-controlled voltage-driven power semiconductor device composed of a BJT (bipolar transistor) and an MOS (insulated gate field effect transistor), and has both high input impedance of the MOSFET and low on-state voltage drop performance of the GTR, it should be noted that the IGBT pair transistor and the TO-3 power pair transistor both use iron cap transistors, and have low noise performance, and preferably, the voltage power amplifier module 202 and the current power amplifier module 204 both further include a current limiting circuit and a temperature protection circuit, the voltage output port 205 and the current output port 206 both use relays, and the voltage driving module 201 and the current driving module 203 are driving circuits of the power amplifier.
Preferably, a current sampling feedback circuit 207 is further arranged between the current power amplifier module 204 and the current output port 206, an input end of the current sampling feedback circuit 207 is connected with an output end of the current power amplifier module 204, and an output end of the current sampling feedback circuit is connected with the current output port 206 and the current driving module 203, so that the output current can be monitored and timely adjusted conveniently, the accuracy and stability of the output current can be ensured, wherein the voltage output port 205 and the current output port 206 are both wiring terminals.
Example 3
Referring to fig. 3, this embodiment differs from the above embodiment in that: the control unit 300 comprises a current flow control module 301, a voltage flow control module 302, a voltage feedback module 303, an ac/dc switching module 304 and a dc/dc conversion module 305, wherein the current flow control module 301 and the voltage flow control module 302 automatically switch gears according to the amplitude of the output voltage to improve the output precision of the source, the voltage feedback module 303 is used for monitoring and feeding back the output of the power amplifier to further improve the precision and the output response speed of the source, the ac/dc switching module 304 switches whether the output is an ac signal or a dc signal, and the dc/dc conversion module 305 is used for dc/dc conversion. Specifically, the input ends of the current flow control module 301 and the voltage flow control module 302 of the control unit 300 are both connected to the output end of the communication unit 400, and are used for automatically switching the gear according to the amplitude of the output voltage; the output end of the current flow control module 301 is connected to the input end of the current driving module 203, the output end of the voltage flow control module 302 is connected to the input end of the voltage driving module 201, and both the current flow control module 301 and the voltage flow control module 302 are CPUs.
Further, the control unit 300 further includes a voltage feedback module 303, an ac/dc switching module 304 and a dc conversion module 305, an output end of the voltage feedback module 303 is connected to the voltage power amplifier module 202 and the dc conversion module 305, an input end of the voltage feedback module 303 is connected to the voltage output port 205 and an output end of the voltage quantity control module 302, an output end of the ac/dc switching module 304 is connected to the voltage driving module 201 for switching between an output ac signal and a output dc signal, wherein the voltage feedback module 303 is a feedback PT, the ac/dc switching module 304 is composed of a DA converter, a waveform processing circuit and a gear switching, and the dc conversion module 305 is an MCU and is used for regulating and controlling the ac/dc switching module 304 to switch a dc output.
Example 4
Referring to fig. 4, this embodiment differs from the above embodiment in that: the conversion unit 500 comprises a current mode PT501, a waveform input module 502, a measurement feedback module 503, an isolation CT504, a measurement PT505 and a measurement CT506, and the current mode PT501, the waveform input module 502, the measurement feedback module 503, the isolation CT504, the measurement PT505 and the measurement CT506 are matched with each other, so that remote monitoring can be realized, two remote or local test modes can be realized, and the practical performance of testing is improved. Specifically, the current mode PT501 of the converting unit 500 and the output terminal of the dc converting module 305 are both connected to the ac/dc switching module 304.
The conversion unit 500 further comprises a waveform input module 502, a measurement feedback module 503, an isolation CT504, a measurement PT505 and a measurement CT506, wherein the waveform input module 502 is respectively connected with the input ends of the isolation CT504 and the current mode PT501, the output end of the isolation CT504 is connected with the current driving module 203, and the output ends of the measurement PT505 and the measurement CT506 are connected with the measurement feedback module 503; the input end of the measurement CT506 is connected to the current output port 206, and is used for measuring the output current; the input end of the measurement PT505 is connected to the voltage output port 205 for measuring the output voltage, the waveform input module 502 is composed of a display screen and a setting button, and the measurement feedback module 503 is a feedback PT circuit.
Further, as shown in fig. 5, the optical isolation unit 401 of the communication unit 400 is connected to the current flow control module 301 and the voltage flow control module 302, and is configured to isolate signals and prevent signals between the modules from interfering with each other, the communication unit 400 further includes a bus output port 402, the bus output port 402 is composed of a 485 communication port and an auxiliary signal, and is configured to assist the signal in order to ensure accuracy of an output phase when an ac signal is output, and to directly control output by 485 communication when a dc signal is output.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. The utility model provides a current-voltage regulation and control system that feeder automation test was used which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the power supply unit (100) comprises a voltage energy transmission module (101) and a current input port (102), wherein the voltage energy transmission module (101) is used for inputting voltage and regulating the input voltage, and the current input port (102) is used for inputting voltage required by test current;
the response unit (200) adopts an iron cap transistor, is used for converting voltage into test voltage or/and current and outputting the test voltage or/and current to be tested, and is connected with a regulation and control submodule (101 a) and a current input port (102) of the voltage energy transmission module (101); and the number of the first and second groups,
the control unit (300) is used for regulating and controlling the response unit (200) according to the instructions transmitted by the communication unit (400) and the conversion unit (500), the voltage energy transmission module (101) further comprises a voltage input port (101 b), the voltage input port (101 b) is used for inputting the voltage required by the test voltage, and is connected with a regulation and control submodule (101 a), the regulation and control submodule (101 a) comprises an L6562A (101 a-1) and a level conversion chip (101 a-2), the input end of the L6562A (101 a-1) is connected with the first connector (101 b-1) of the voltage input port (101 b), the output end of the L6562A is connected with the voltage driving module (201) of the response unit (200), and the input end and the output end of the level conversion chip (101 a-2) are respectively connected with the second connector (101 b-2) of the voltage input port (101 b) and the voltage power amplification module (202) of the response unit (200) ) The voltage power amplifier module (202) and the current power amplifier module (204) are connected by adopting IGBT (insulated gate bipolar transistor) pair transistors and TO-3 power pair transistors respectively, the IGBT is a composite fully-controlled voltage-driven power semiconductor device consisting of BJT (bipolar junction transistor) and MOS (insulated gate field effect transistor), the IGBT pair transistors and the TO-3 power pair transistors adopt iron cap transistors, a voltage driving module (201) of the response unit (200) drives the voltage power amplifier module (202) TO adjust a voltage signal, the response unit (200) further comprises a current driving module (203), a current power amplifier module (204), a voltage output port (205) and a current output port (206), the current driving module (203) drives the current power amplifier module (204) TO convert the voltage into a test current signal, and the test current signal is output TO a tested device through the current output port (206), the voltage output port (205) is connected with the voltage power amplifier module (202), a current sampling feedback circuit (207) is further arranged between the current power amplifier module (204) and the current output port (206), and the input ends of a current flow control module (301) and a voltage flow control module (302) of the control unit (300) are both connected with the output end of the communication unit (400) and used for automatically switching gears according to the amplitude of output voltage;
wherein the output end of the current flow control module (301) is connected with the input end of the current driving module (203);
wherein, the output of voltage volume control module (302) with the input of voltage drive module (201) is connected, the control unit (300) still includes voltage feedback module (303), alternating current-direct current switches module (304) and direct current conversion module (305), the output of voltage feedback module (303) with voltage power amplifier module (202) and direct current conversion module (305) are connected, and its input all is connected with the output of voltage output port (205) and voltage volume control module (302), the output and the voltage drive module (201) of alternating current-direct current switching module (304) are connected and are used for switching output alternating current signal or direct current signal.
2. The current-voltage regulation system for feeder automation testing of claim 1, wherein: the current mode PT (501) of the conversion unit (500) and the output end of the direct current conversion module (305) are connected with the alternating current-direct current switching module (304).
3. The current-voltage regulation system for feeder automation testing of claim 2, wherein: the conversion unit (500) further comprises a waveform input module (502), a measurement feedback module (503), an isolation CT (504), a measurement PT (505) and a measurement CT (506), wherein the waveform input module (502) is respectively connected with the input ends of the isolation CT (504) and the current type PT (501), the output end of the isolation CT (504) is connected with the current driving module (203), and the output ends of the measurement PT (505) and the measurement CT (506) are connected with the measurement feedback module (503);
wherein the input end of the measuring CT (506) is connected with the current output port (206) and is used for measuring the output current;
wherein, the input end of the measuring PT (505) is connected with the voltage output port (205) and is used for measuring the output voltage.
4. The system of any of claims 1 to 3, wherein the system further comprises: an optical isolation unit (401) of the communication unit (400) is connected with the current quantity control module (301) and the voltage quantity control module (302) for isolating signals.
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| CN112649698A (en) * | 2020-12-09 | 2021-04-13 | 南京理工大学北方研究院 | Feeder automation test system |
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| CN201327524Y (en) * | 2008-11-20 | 2009-10-14 | 西安佰人科技有限公司 | High-voltage heavy-current amplifier circuit |
| CN201926755U (en) * | 2010-12-29 | 2011-08-10 | 广东省计量科学研究院东莞分院 | Calibrating device for AC/DC leakage current tester |
| CN202372580U (en) * | 2011-10-19 | 2012-08-08 | 北京强度环境研究所 | Analog quantity converter test bench |
| CN103812354A (en) * | 2014-02-24 | 2014-05-21 | 苏州科技学院 | Broadband strong current generator power supply |
| CN204142782U (en) * | 2014-07-15 | 2015-02-04 | 苏州大学 | The high precision numerical control power supply that a kind of output waveform is controlled |
| CN104849591B (en) * | 2015-05-07 | 2017-09-15 | 国家电网公司 | A kind of power distribution automation integration test detection means |
| CN109683032A (en) * | 2017-10-18 | 2019-04-26 | 中国电力科学研究院有限公司 | A kind of feeder automation tester and its output current control method |
| CN110018342A (en) * | 2019-05-17 | 2019-07-16 | 南方电网科学研究院有限责任公司 | A kind of program-controlled power signal test device based on transformer |
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