CN103839463A - Simulation transformer lead detection method and system - Google Patents

Simulation transformer lead detection method and system Download PDF

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Publication number
CN103839463A
CN103839463A CN201210485595.5A CN201210485595A CN103839463A CN 103839463 A CN103839463 A CN 103839463A CN 201210485595 A CN201210485595 A CN 201210485595A CN 103839463 A CN103839463 A CN 103839463A
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CN
China
Prior art keywords
lead
wire
electric signal
splicing ear
mutual inductor
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CN201210485595.5A
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Chinese (zh)
Inventor
陈振虎
龚明波
刘沛立
朱小武
万真礼
石琦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Ningbo Electric Power Bureau
Original Assignee
State Grid Corp of China SGCC
Ningbo Electric Power Bureau
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by State Grid Corp of China SGCC, Ningbo Electric Power Bureau filed Critical State Grid Corp of China SGCC
Priority to CN201210485595.5A priority Critical patent/CN103839463A/en
Publication of CN103839463A publication Critical patent/CN103839463A/en
Pending legal-status Critical Current

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Abstract

The application discloses a simulation transformer wire connection detection method and system. The system comprises a power supply device, a detection circuit and a decision circuit. The power supply device is connected with each lead separately for outputting different electrical signals to each lead. A plurality of input ends of the detection circuit are connected with a plurality of the connection terminals respectively for detecting the electrical signals transmitted to the connection terminals through the leads. The decision circuit is connected with a plurality of output ends of the detection circuit for comparing the detected electrical signals of the plurality of the connection terminal with a corresponding preset value and determining the connection condition of the leads on the plurality of the connection terminals according to the comparison result. According to the system, in the training process, trainers can simulate the wire connection process, and the existing problem that the training process cannot be performed through a real high-voltage metering cabinet can be solved.

Description

A kind of emulation mutual inductor lead-in wire detection method and system
Technical field
The application relates to high-tension measurement equipment technical field, particularly relates to a kind of emulation mutual inductor lead-in wire detection method and system.
Background technology
In the time of normal power supply, electric company need to be to the user installation ammeter of high pressure measurement, ammeter is arranged on transformer station or user's switchgear building conventionally, the principle of metering is that high pressure is become to low pressure, large electric current is become to little electric current through current transformer sends into ammeter metering through voltage transformer (VT), and the groundwork that ammeter is installed connects also inspection of wire.If setup error can cause the accident or error in dipping at double, have a strong impact on Electrical Safety and charge calculation, so electric company actively develops this type of training in inside, training worker correct wiring.
And owing to not allowing to carry out at the scene this type of training, so training is generally all placed on classroom or spacious office carries out, the real high-voltage metering cubicle of the general employing of equipment of training use, and real high-voltage metering cubicle, because cabinet is bulky, heavy, is not suitable for installing in classroom, and consider 10kV voltage danger, all no powers just cannot allow ammeter turn round like this in the time of training, check correctness.
Therefore adopt real high-voltage metering cubicle cannot carry out preferably training.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of emulation mutual inductor lead-in wire detection method and system, the problem that cannot give training to solve the real high-voltage metering cubicle of existing employing.
To achieve these goals, the technical scheme that the embodiment of the present application provides is as follows:
A kind of emulation mutual inductor lead-in wire detection system, lead-in wire connection for the splicing ear to emulation mutual inductor detects, described emulation mutual inductor is hollow structure, and be provided with multiple splicing ears on described emulation mutual inductor, on each described splicing ear, be connected with lead-in wire, comprise: electric supply installation, testing circuit and decision circuit, wherein:
Described electric supply installation is connected with each described lead-in wire respectively, for exporting different electric signal to each lead-in wire;
Multiple input ends of described testing circuit are connected with multiple described splicing ears respectively, are transferred to the electric signal of described splicing ear for detection of warp and lead-in wire;
Described decision circuit is connected with multiple output terminals of described testing circuit, for the electric signal that multiple described splicing ears detected is compared with each self-corresponding preset value respectively, and determine according to comparative result the connection going between on multiple described splicing ears.
Preferably, in this emulation mutual inductor lead-in wire detection system that the embodiment of the present application provides, described electric supply installation is multi-core socket.
Preferably, in this emulation mutual inductor lead-in wire detection system that the embodiment of the present application provides, described testing circuit is electrical signal detection circuit.
Preferably, in this emulation mutual inductor lead-in wire detection system that the embodiment of the present application provides, described decision circuit comprises: comparator circuit and controller, wherein:
Described comparator circuit is for comparing the electric signal that multiple described splicing ears detected respectively with each self-corresponding preset value;
Described controller, in the time detecting that the electric signal of splicing ear is less than corresponding preset value, determines that the lead-in wire being connected with this splicing ear does not connect;
In the time detecting that the electric signal of splicing ear is more than or equal to corresponding preset value, determine that the lead-in wire being connected with this splicing ear is connected well.
Preferably, this emulation mutual inductor lead-in wire detection system that the embodiment of the present application provides, further comprises: indicating device,
Described indicating device is connected with described testing circuit, for according to detecting that the electric signal of multiple described splicing ears exports indication.
Preferably, in this emulation mutual inductor lead-in wire detection system that the embodiment of the present application provides, described indicating device comprises: voltage table, reometer and/or electric energy meter.
A kind of emulation mutual inductor lead-in wire detection method, lead-in wire connection for the splicing ear to emulation mutual inductor detects, and described emulation mutual inductor is hollow structure, and is provided with multiple splicing ears on described emulation mutual inductor, on each described splicing ear, be connected with lead-in wire
To the lead-in wire input electrical signal being connected with the splicing ear of described emulation mutual inductor;
At the electric signal of splicing ear described in the position probing of splicing ear;
The electric signal detecting and preset value are compared;
In the time that the electric signal detecting is less than preset value, determine that the lead-in wire being connected with splicing ear does not connect; In the time that the electric signal detecting is more than or equal to preset value, determine that the lead-in wire being connected with splicing ear is connected well.
Preferably, in this emulation mutual inductor lead-in wire detection method that the embodiment of the present application provides, utilize voltage comparator that the electric signal detecting and preset value are compared;
In the time that the electric signal detecting is less than preset value, output first signal, described first signal characterizes the lead-in wire being connected with splicing ear and does not connect; In the time that the electric signal detecting is more than or equal to preset value, output secondary signal, described secondary signal characterizes the lead-in wire being connected with splicing ear and is connected well.
Preferably, in this emulation mutual inductor lead-in wire detection method that the embodiment of the present application provides, further comprise:
The electric signal of detection is outputed on indicating equipment and indicated.
From with technical scheme, this emulation mutual inductor lead-in wire detection system that the embodiment of the present application provides, in training process, start-up can simulation connection process, one end of lead-in wire is connected with connection terminal, then the other end of lead-in wire is connected on electric supply installation, utilize electric supply installation to pass through lead-in wire to splicing ear input electrical signal, then at the position probing electric signal of splicing ear, and the electric signal detecting and preset value are compared, in the time that the electric signal detecting is less than preset value, determine that the lead-in wire being connected with this splicing ear does not connect, otherwise, the lead-in wire being connected with this splicing ear is connected well.
This system can detect the operational circumstances of start-up's connection wire, and in the time there is wire bad connection, can accurately detect, and has solved the problem that the real high-voltage metering cubicle of existing employing cannot give training.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of emulation mutual inductor;
The structural representation of a kind of emulation mutual inductor lead-in wire detection system that Fig. 2 provides for the embodiment of the present application one;
The structural representation of the another kind of emulation mutual inductor lead-in wire detection system that Fig. 3 provides for the embodiment of the present application one;
The structural representation of another emulation mutual inductor lead-in wire detection system that Fig. 4 provides for the embodiment of the present application one;
The schematic flow sheet of a kind of emulation mutual inductor lead-in wire detection method that Fig. 5 provides for the embodiment of the present application two;
The schematic flow sheet of the another kind of emulation mutual inductor lead-in wire detection method that Fig. 6 provides for the embodiment of the present application two.
Embodiment
In order to make those skilled in the art person understand better the technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Based on the embodiment in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all should belong to the scope of the application's protection.
This emulation mutual inductor lead-in wire detection method and system that the embodiment of the present application provides are based on emulation mutual inductor, rather than real mutual inductor.
Fig. 1 is the structural representation of emulation mutual inductor.
As shown in Figure 1, this emulation mutual inductor comprises: mutual inductor housing 1 and multiple connection terminal, as shown in figure 2,3, mutual inductor housing 1 is the scale model of real voltage mutual inductor, and multiple connection terminal is positioned on mutual inductor housing 1.Wherein: the structure of mutual inductor housing 1 is hollow rectangular structure, in the embodiment of the present application, as shown in Figure 1, the structure of mutual inductor 1 is approximate rectangular structure.Here mutual inductor housing 1 is owing to being the scale model of true mutual inductor, thus its structure and existing be really that mutual inductor can be similar.This mutual inductor housing 1 is formed by Plate Welding, and inside is hollow-core construction, inner without poured with epoxy resin, and siliconized plate and copper cash are not set yet.Such design make this emulation mutual inductor weight saving a lot, and owing to being scale model, so volume is also less, convenient this emulation mutual inductor is placed in emulation metering cabinet.In addition, for convenient this emulation mutual inductor of installing, as shown in Figure 1, be provided with two installing plates 5 at the relative two ends of the basal surface position of mutual inductor housing 1, on installing plate, be provided with multiple mounting holes 6.So when mounted, bolt can be fixed this mutual inductor housing 1 through mounting hole 6.
Multiple connection terminals are positioned on mutual inductor 1, as shown in Figure 1, in the embodiment of the present application, the number of connection terminal is six, be respectively: two the first connection terminals 3 and four the second connection terminals 2, wherein: two the first connection terminals 3 are positioned on the end face of mutual inductor housing 1, in the time that actual emulation is simulated, two the first connection terminals can be simulated respectively 10KV access; Two the second connection terminals 2 are positioned on the side of mutual inductor housing 1, in the time that actual emulation is simulated, can simulate first group of 100V voltage access for two in four the second connection terminals 2, and two other can simulate second group of 100V voltage access.
On each connection terminal, be respectively arranged with a connecting lead wire 4, for simulating the terminal line situation of mutual inductor.In addition, in the embodiment of the present application, each connection terminal comprises: support column and knob, take the first connection terminal 3 as example, wherein support column is 31, and knob is 32, and support column 31 is fixed on mutual inductor housing 1, and on support column 31, be provided with screw thread (not shown), knob 32 is threaded connection and is fixed on support column 31.Like this in the time unclamping knob, lead-in wire 4 can be wrapped on support column 31, and then compress knob 32, making to go between 4 is connected with support column 31.
Embodiment mono-:
The structural representation of the emulation mutual inductor lead-in wire detection system that Fig. 2 provides for the embodiment of the present application one.
As shown in Figure 2, this system comprises: electric supply installation 10, testing circuit 20 and decision circuit 30, wherein:
Electric supply installation 10 is connected with each lead-in wire 4 respectively, for exporting different electric signal to each lead-in wire 4.In the embodiment of the present application, electric supply installation 10 can be multi-core socket.In the embodiment of the present application, electric signal can be current signal, can be also voltage signal.
Multiple input ends of testing circuit 20 are connected with multiple splicing ears respectively, are transferred to the electric signal of splicing ear for detection of warp and lead-in wire 4.
Decision circuit 30 is connected with multiple output terminals of testing circuit 20, for the electric signal that multiple splicing ears detected is compared with each self-corresponding preset value respectively, and determines according to comparative result the connection going between on multiple splicing ears.
As shown in Figure 3, decision circuit 30 comprises: comparator circuit 310 and controller 320, wherein:
Comparator circuit 310 is for comparing the electric signal that multiple splicing ears detected respectively with each self-corresponding preset value; Controller 320, in the time detecting that the electric signal of splicing ear is less than corresponding preset value, determines that the lead-in wire being connected with this splicing ear does not connect; In the time detecting that the electric signal of splicing ear is more than or equal to corresponding preset value, determine that the lead-in wire being connected with this splicing ear is connected well.
In addition, as shown in Figure 4, this system can also comprise: indicating device 40, indicating device 40 is connected with testing circuit 20, for according to detecting that the electric signal of multiple splicing ears exports indication.In the embodiment of the present application, described indicating device comprises: voltage table, reometer and/or electric energy meter.The Main Function of indicating device is to observe more intuitively electrical signal detection situation for handled easily personnel.
This emulation mutual inductor lead-in wire detection system that the embodiment of the present application provides, in training process, start-up can simulation connection process, one end of lead-in wire is connected with connection terminal, then the other end of lead-in wire is connected on electric supply installation, utilize electric supply installation to pass through lead-in wire to splicing ear input electrical signal, then at the position probing electric signal of splicing ear, and the electric signal detecting and preset value are compared, in the time that the electric signal detecting is less than preset value, determine that the lead-in wire being connected with this splicing ear does not connect, otherwise, the lead-in wire being connected with this splicing ear is connected well.
This system can detect the operational circumstances of start-up's connection wire, and in the time there is wire bad connection, can accurately detect, and has solved the problem that the real high-voltage metering cubicle of existing employing cannot give training.
Embodiment bis-:
The process flow diagram of a kind of emulation mutual inductor lead-in wire detection method that Fig. 5 provides for the embodiment of the present application two.
As shown in Figure 5, the method comprises:
S100: to the lead-in wire input electrical signal being connected with the splicing ear of emulation mutual inductor.
In the time of input electrical signal, can utilize multi-core socket simultaneously to multiple splicing ears input electrical signals simultaneously on emulation mutual inductor, and the electric signal difference of different splicing ear input.In the embodiment of the present application, electric signal can be current signal, can be also voltage signal.
S200: at the electric signal of the position probing splicing ear of splicing ear.
The object of this programme is the connection in order to detect lead-in wire, so in the time detecting, detection position is arranged on the position of splicing ear.
S300: the electric signal detecting and preset value are compared, and determine according to comparative result the connection going between on splicing ear.
In the time that the electric signal detecting is less than preset value, determine that the lead-in wire being connected with splicing ear does not connect; In the time that the electric signal detecting is more than or equal to preset value, determine that the lead-in wire being connected with splicing ear is connected well.
In addition, while comparing in the embodiment of the present application, utilize voltage comparator that the electric signal detecting and preset value are compared.Wherein: in the time that the electric signal detecting is less than preset value, output first signal, first signal described here characterizes the lead-in wire being connected with splicing ear and does not connect; In the time that the electric signal detecting is more than or equal to preset value, output secondary signal, described secondary signal characterizes the lead-in wire being connected with splicing ear and is connected well.
In addition, as shown in Figure 6, the method can also comprise:
S400: the electric signal of detection is outputed on indicating equipment and indicated.
Indicating equipment can comprise: voltage table, reometer and/or electric energy meter, observe more intuitively electrical signal detection situation with handled easily personnel.
This emulation mutual inductor lead-in wire detection method that the embodiment of the present application provides, in training process, start-up can simulation connection process, one end of lead-in wire is connected with connection terminal, then the other end of lead-in wire is connected on electric supply installation, utilize electric supply installation to pass through lead-in wire to splicing ear input electrical signal, then at the position probing electric signal of splicing ear, and the electric signal detecting and preset value are compared, in the time that the electric signal detecting is less than preset value, determine that the lead-in wire being connected with this splicing ear does not connect, otherwise, the lead-in wire being connected with this splicing ear is connected well.
The method can detect the operational circumstances of start-up's connection wire, and in the time there is wire bad connection, can accurately detect, and has solved the problem that the real high-voltage metering cubicle of existing employing cannot give training.
Above provided information search system, can be the search engine that is applied to internet hunt, can be also the information search system that is applied to the search of unit, LAN.
Certainly user feedback amount, might not be the unique factor to search results ranking.Other factors, for example keyword of user's input and the matching degree of webpage institute exhibition information, the Page Rank values of webpage etc., can be as the factor to search results ranking together with user feedback amount.
For convenience of description, while describing above device, being divided into various unit with function describes respectively.Certainly, in the time implementing the application, the function of each unit can be realized in same or multiple software and/or hardware.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the application can add essential general hardware platform by software and realizes.Based on such understanding, the part that the application's technical scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the application or embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is and the difference of other embodiment.Especially,, for system embodiment, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.System embodiment described above is only schematic, the wherein said unit as separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in multiple network element.Can select according to the actual needs some or all of module wherein to realize the object of the present embodiment scheme.Those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.
The application can be used in numerous general or special purpose computingasystem environment or configuration.For example: personal computer, server computer, handheld device or portable set, plate equipment, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, small-size computer, mainframe computer based on microprocessor, comprise distributed computing environment of above any system or equipment etc.
The application can describe in the general context of the computer executable instructions of being carried out by computing machine, for example program module.Usually, program module comprises and carries out particular task or realize routine, program, object, assembly, data structure of particular abstract data type etc.Also can in distributed computing environment, put into practice the application, in these distributed computing environment, be executed the task by the teleprocessing equipment being connected by communication network.In distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium including memory device.
The above is only the application's embodiment; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection domain.
The above is only the application's preferred implementation, makes those skilled in the art can understand or realize the application.To be apparent to one skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the case of not departing from the application's spirit or scope, realize in other embodiments.Therefore, the application will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (9)

1. an emulation mutual inductor lead-in wire detection system, lead-in wire connection for the splicing ear to emulation mutual inductor detects, described emulation mutual inductor is hollow structure, and be provided with multiple splicing ears on described emulation mutual inductor, on each described splicing ear, be connected with lead-in wire, it is characterized in that, this system comprises:
Electric supply installation, testing circuit and decision circuit, wherein:
Described electric supply installation is connected with each described lead-in wire respectively, for exporting different electric signal to each lead-in wire;
Multiple input ends of described testing circuit are connected with multiple described splicing ears respectively, are transferred to the electric signal of described splicing ear for detection of warp and lead-in wire;
Described decision circuit is connected with multiple output terminals of described testing circuit, for the electric signal that multiple described splicing ears detected is compared with each self-corresponding preset value respectively, and determine according to comparative result the connection going between on multiple described splicing ears.
2. system according to claim 1, is characterized in that, is multi-core socket for described electric supply installation from different electric signal to each lead-in wire that export.
3. system according to claim 2, is characterized in that, described testing circuit is electrical signal detection circuit.
4. system according to claim 3, is characterized in that, described decision circuit comprises: comparator circuit and controller, wherein:
Described comparator circuit is for comparing the electric signal that multiple described splicing ears detected respectively with each self-corresponding preset value;
Described controller, in the time detecting that the electric signal of splicing ear is less than corresponding preset value, determines that the lead-in wire being connected with this splicing ear does not connect;
In the time detecting that the electric signal of splicing ear is more than or equal to corresponding preset value, determine that the lead-in wire being connected with this splicing ear is connected well.
5. system according to claim 4, is characterized in that, further comprises: indicating device,
Described indicating device is connected with described testing circuit, for according to detecting that the electric signal of multiple described splicing ears exports indication.
6. system according to claim 5, is characterized in that, described indicating device comprises: voltage table, reometer and/or electric energy meter.
7. an emulation mutual inductor lead-in wire detection method, lead-in wire connection for the splicing ear to emulation mutual inductor detects, described emulation mutual inductor is hollow structure, and be provided with multiple splicing ears on described emulation mutual inductor, on each described splicing ear, be connected with lead-in wire, it is characterized in that
To the lead-in wire input electrical signal being connected with the splicing ear of described emulation mutual inductor;
At the electric signal of splicing ear described in the position probing of splicing ear;
The electric signal detecting and preset value are compared;
In the time that the electric signal detecting is less than preset value, determine that the lead-in wire being connected with splicing ear does not connect;
In the time that the electric signal detecting is more than or equal to preset value, determine that the lead-in wire being connected with splicing ear is connected well.
8. method according to claim 7, is characterized in that,
Utilize voltage comparator that the electric signal detecting and preset value are compared;
In the time that the electric signal detecting is less than preset value, output first signal, described first signal characterizes the lead-in wire being connected with splicing ear and does not connect; In the time that the electric signal detecting is more than or equal to preset value, output secondary signal, described secondary signal characterizes the lead-in wire being connected with splicing ear and is connected well.
9. method according to claim 8, is characterized in that, further comprises:
The electric signal of detection is outputed on indicating equipment and indicated.
CN201210485595.5A 2012-11-23 2012-11-23 Simulation transformer lead detection method and system Pending CN103839463A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210485595.5A CN103839463A (en) 2012-11-23 2012-11-23 Simulation transformer lead detection method and system

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Application Number Priority Date Filing Date Title
CN201210485595.5A CN103839463A (en) 2012-11-23 2012-11-23 Simulation transformer lead detection method and system

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Publication Number Publication Date
CN103839463A true CN103839463A (en) 2014-06-04

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Citations (6)

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Publication number Priority date Publication date Assignee Title
US5519755A (en) * 1991-07-05 1996-05-21 Siemens Aktiengesellschaft Circuit for a line simulating device
CN2758783Y (en) * 2004-12-29 2006-02-15 许源芳 Ground wire detector and terminal plate for detecting ground wire condition
CN201584076U (en) * 2009-12-24 2010-09-15 山东电力集团公司潍坊供电公司 Simulator for mutual inductor
CN201594345U (en) * 2009-12-02 2010-09-29 河北省电力公司超高压输变电分公司 Transformer substation current testing terminal switching simulation operating panel
CN102654951A (en) * 2012-04-12 2012-09-05 苏州市职业大学 Automatic electronic experimental teaching system
CN202904974U (en) * 2012-11-23 2013-04-24 宁波电业局 Simulation transformer lead wire detection system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519755A (en) * 1991-07-05 1996-05-21 Siemens Aktiengesellschaft Circuit for a line simulating device
CN2758783Y (en) * 2004-12-29 2006-02-15 许源芳 Ground wire detector and terminal plate for detecting ground wire condition
CN201594345U (en) * 2009-12-02 2010-09-29 河北省电力公司超高压输变电分公司 Transformer substation current testing terminal switching simulation operating panel
CN201584076U (en) * 2009-12-24 2010-09-15 山东电力集团公司潍坊供电公司 Simulator for mutual inductor
CN102654951A (en) * 2012-04-12 2012-09-05 苏州市职业大学 Automatic electronic experimental teaching system
CN202904974U (en) * 2012-11-23 2013-04-24 宁波电业局 Simulation transformer lead wire detection system

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Application publication date: 20140604