CN203191429U - High-precision adjustable current transmitter - Google Patents
High-precision adjustable current transmitter Download PDFInfo
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- CN203191429U CN203191429U CN 201320113895 CN201320113895U CN203191429U CN 203191429 U CN203191429 U CN 203191429U CN 201320113895 CN201320113895 CN 201320113895 CN 201320113895 U CN201320113895 U CN 201320113895U CN 203191429 U CN203191429 U CN 203191429U
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Abstract
The utility model discloses a high-precision adjustable current transmitter, comprising a cabinet internally equipped with a signal transformation part and a transformation ratio switching control part, wherein the signal transformation part is connected with the transformation ratio switching control part through a line; the transformation ratio switching control part is connected with a background monitoring host through an RS485 bus; and the signal transformation part is connected with a primary current transformer through a line. According to the utility model, current signals acquired by the traditional primary current transformer CT are converted into small voltage signals within +/- 5 V, and the current signals can be adjusted and changed on line according to the magnitude of current so as to enable the converted voltage signals to be distributed within the range of +/- 5 V by a larger margin, thereby increasing the precision of measurement; and the high-precision adjustable current transmitter is also adaptable to other electric power system applications requiring wide-range current measurements, and particularly has a larger cost advantage from the perspective of reconstruction of traditional equipment.
Description
Technical field
The utility model relates to a kind of high precision adjustable current transmitter, being specifically related to a kind of current signal that will collect from the high-voltage great-current circuit is converted to the small voltage signal and directly uses for the high-speed data acquisition main frame, but the high-precision current transmitter of real-time online ground conversion no-load voltage ratio in the current signal transfer process belongs to the current measure device technical field in the powerful device experimental test process in the electric system simultaneously.
Background technology
Often need be to testing equipments such as isolating switch, capacitor, reactor, fuse, filter, SVG in the electric system testing station, often all need be in test process the variation of the current signal of system be detected.But the electric pressure of these tests, size of current all can be different, even same equipment also has the test request of working under different load currents.This just requires our test environment can both measure the electric current of this wide variation, therefore can adapt to wide region, and the many grades of high-precision current measuring equipments that can regulate no-load voltage ratio are needed.In traditional testing station, or be that no-load voltage ratio is single, measuring accuracy is not high; Be to need artificial wiring to change no-load voltage ratio, must have a power failure and wait for, take time and effort.Along with the development of modern electric, people require more and more higher to robotization simultaneously, the mode of this field modification wiring, and security, dirigibility and aesthetics obviously do not meet the demand in epoch yet.
The utility model content
The purpose of this utility model is to provide a kind of high precision adjustable current transmitter, by the current signal that will collect among traditional primary current mutual inductor CT be converted into ± 5V is with interior small voltage signal, and can be according to the big or small online adjusting no-load voltage ratio of electric current, so that transform in the scope of back voltage signal being distributed in by a larger margin ± 5V, thereby improve the precision of measuring.Simultaneously ± and the 5V voltage signal also is suitable for the collection of main frame and do not need to carry out the conversion of signal again, uses for other electric system that requires the wide region current measurement to have applicability equally, particularly be to have more cost advantage in the transformation to legacy equipment.
In order to achieve the above object, the technical solution of the utility model is:
A kind of high precision adjustable current transmitter comprises cabinet, and signal conversion fraction and no-load voltage ratio switching control part are installed in the described cabinet; Wherein said signal conversion fraction links to each other with the no-load voltage ratio switching control part by circuit; Described no-load voltage ratio switching control part links to each other with the background monitoring main frame by the RS485 bus; Described signal conversion fraction links to each other with the primary current mutual inductor by circuit.
Described signal conversion fraction comprises secondary current mutual inductor and microcontactor; Described microcontactor comprises first microcontactor, second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor, the 7th microcontactor; Wherein said secondary current mutual inductor links to each other with first microcontactor, second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor, the 7th microcontactor by circuit respectively.
Described secondary current mutual inductor comprises winding and Secondary Winding; Be connected with first tap, second tap, the 3rd tap, the 4th tap, the 5th tap, the 6th tap, the 7th tap respectively on the wherein said winding; Wherein said first tap links to each other with first microcontactor by circuit; Described second tap links to each other with second microcontactor by circuit; Described the 3rd tap links to each other with the 3rd microcontactor by circuit; Described the 4th tap links to each other with the 4th microcontactor by circuit; Described the 5th tap links to each other with the 5th microcontactor by circuit; Described the 6th tap links to each other with the 6th microcontactor by circuit; Link to each other with the primary current mutual inductor with the 7th microcontactor respectively by circuit after described first microcontactor, second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor parallel connection; Described the 7th tap links to each other with the primary current mutual inductor with the 7th microcontactor by circuit respectively; Be connected with the 8th tap and the 9th tap on the described Secondary Winding respectively; Be connected with power termination resistance R 1 between described the 8th tap and the 9th tap.
Described first microcontactor, second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor adopt 3 utmost point main contacts microcontactors; Per 1 utmost point of 3 utmost point main contactss of described microcontactor respectively with three-phase alternating current in one link to each other.
Described secondary current mutual inductor adopts whole resin-sealed.
Described no-load voltage ratio switching control part comprises that 8 drive IO module, microcontactor, selector switch and the universal seclector of leaving into 8; Wherein said selector switch comprises manual contact and automated contact; Described first microcontactor comprises that pull-in winding, first microcontactor of first microcontactor are often driven auxiliary contact and the 8th microcontactor is often driven auxiliary contact; Described second microcontactor comprises that pull-in winding, second microcontactor of second microcontactor are often driven auxiliary contact and the 9th microcontactor is often driven auxiliary contact; Described the 3rd microcontactor comprises that pull-in winding, the 3rd microcontactor of the 3rd microcontactor are often driven auxiliary contact and the tenth microcontactor is often driven auxiliary contact; Described the 4th microcontactor comprise the 4th microcontactor pull-in winding, the 4th microcontactor often drives auxiliary contact and the 11 microcontactor is often driven auxiliary contact; Described the 5th microcontactor comprise the 5th microcontactor pull-in winding, the 5th microcontactor often drives auxiliary contact and the 12 microcontactor is often driven auxiliary contact; Described the 6th microcontactor comprise the 6th microcontactor pull-in winding, the 6th microcontactor often drives auxiliary contact and the 13 microcontactor is often driven auxiliary contact; Described the 7th microcontactor comprises pull-in winding and the 7th microcontactor normally closed auxiliary contact of the 7th microcontactor; Described first microcontactor is often driven auxiliary contact, second microcontactor and is often driven auxiliary contact, the 3rd microcontactor and often drive auxiliary contact, the 4th microcontactor and often open that auxiliary contact often left by auxiliary contact, the 5th microcontactor, the 6th microcontactor is often driven auxiliary contact by after the circuit parallel connection, one end with connect external power source after selector switch is in parallel, the pull-in winding of the other end and the 7th microcontactor be connected in series (external power source is given the control coil power supply of microcontactor, also opens into 8 to 8 simultaneously and leaves the IO module for power supply); Described 8 open into the 8 IO modules of leaving comprise first leave, second leave, the 3rd leave, the 4th leave, the 5th leave, the 6th leave, minion goes out; Described first leaves by the pull-in winding of circuit with first microcontactor and links to each other; Described second leaves by the pull-in winding of circuit with second microcontactor and links to each other; The described the 3rd leaves by the pull-in winding of circuit with the 3rd microcontactor and links to each other; The described the 4th leaves by the pull-in winding of circuit with the 4th microcontactor and links to each other; The described the 5th leaves by the pull-in winding of circuit with the 5th microcontactor and links to each other; The described the 6th leaves by the pull-in winding of circuit with the 6th microcontactor and links to each other; And described first leave, second leave, the 3rd leave, the 4th leave, the 5th leave, the 6th leave by linking to each other with the 7th microcontactor normally closed auxiliary contact again after the circuit parallel connection; Described universal seclector comprises the first universal seclector contact, the second universal seclector contact, the 3rd universal seclector contact, the 4th universal seclector contact, the 5th universal seclector contact, the 6th universal seclector contact; The described first universal seclector contact, the second universal seclector contact, the 3rd universal seclector contact, the 4th universal seclector contact, the 5th universal seclector contact, the 6th universal seclector contact link to each other with manual contact by after the circuit parallel connection again; The described first universal seclector contact links to each other by the pull-in winding of circuit with first microcontactor; The described second universal seclector contact links to each other by the pull-in winding of circuit with second microcontactor; Described the 3rd universal seclector contact links to each other by the pull-in winding of circuit with the 3rd microcontactor; Described the 4th universal seclector contact links to each other by the pull-in winding of circuit with the 4th microcontactor; Described the 5th universal seclector contact links to each other by the pull-in winding of circuit with the 5th microcontactor; Described the 6th universal seclector contact links to each other by the pull-in winding of circuit with the 6th microcontactor; The pull-in winding of described first microcontactor is often driven auxiliary contact by circuit and the 8th microcontactor and is linked to each other; The pull-in winding of described second microcontactor is often driven auxiliary contact by circuit and the 9th microcontactor and is linked to each other; The pull-in winding of described the 3rd microcontactor is often driven auxiliary contact by circuit and the tenth microcontactor and is linked to each other; The pull-in winding of described the 4th microcontactor is often driven auxiliary contact by circuit and the 11 microcontactor and is linked to each other; The pull-in winding of described the 5th microcontactor is often driven auxiliary contact by circuit and the 12 microcontactor and is linked to each other; The pull-in winding of described the 6th microcontactor is often driven auxiliary contact by circuit and the 13 microcontactor and is linked to each other; Described the 8th microcontactor is often driven auxiliary contact, the 9th microcontactor and is often driven auxiliary contact, the tenth microcontactor and often drive auxiliary contact, the 11 microcontactor and often drive auxiliary contact, the 12 microcontactor and often drive auxiliary contact, the 13 microcontactor and often drive auxiliary contact and go out to link to each other with minion again after by the circuit parallel connection; Described the 7th microcontactor normally closed auxiliary contact goes out by linking to each other with automated contact after the circuit parallel connection with minion again; After the pull-in winding parallel connection of the pull-in winding of the pull-in winding of the pull-in winding of the pull-in winding of the pull-in winding of the pull-in winding of described first microcontactor, second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor, the 7th microcontactor by line-to-ground.
The beneficial effects of the utility model are: a kind of high precision adjustable current transmitter of the present utility model, adopt a multitap secondary current mutual inductor of a winding band, will from the high-voltage great-current circuit, collect current signal and be converted to the small voltage signal and directly use for the high-speed data acquisition main frame.Have the following advantages: 1) adopt the design of many grades of no-load voltage ratios, improved the resolution of current measurement, and then improved the precision of measuring.2) do not introduce nonlinear device in the whole signalling channel of signal conversion and conversion no-load voltage ratio, adopt the how tapped secondary current mutual inductor switching signal that directly is coupled, the measurement data linearity of output is good, is conducive to the raising of measuring accuracy.4) utilize IO module, universal seclector and contactor, realized manual and two kinds of control modes of Remote on the spot, the tap-change of online real-time control current transformer inserts, but real-time online conversion no-load voltage ratio.Exempt the loaded down with trivial details of field wiring, do not needed to have a power failure and wait for, improved work efficiency.5) be used the circuit that can be applicable to different electric pressures with a different CT, applicable scope is wide.6) described transmitter integral body does not comprise high-pressure section, so it can place the device cabinet of electric power secondary side.Safety coefficient improves greatly in installation and use.Because having adopted the integrated apparatus structural design, place device cabinet monnolithic case attractive in appearance again, installation process is simple at the scene, easy-to-connect.7) described control section has adopted fieldbus RS485 and background monitoring host communication.But the real-time conversion no-load voltage ratio of user of service's Remote also can be monitored the reliability height to the whole control process execution result.A background monitoring main frame can be monitored many transmitters in real time by the RS485 bus simultaneously.Usage ratio of equipment such as the ability of operating personnel's parallel processing transactions and background host computer have been improved.The utility model adopts the integrated apparatus structure, and it is little to have a volume, good looking appearance, wiring is few, antijamming capability is strong, the safe reliability height, easy for installation flexibly, convenient advantage of in various cabinets and scene, installing.In the process of current measurement, exempt the loaded down with trivial details of field wiring, do not needed to have a power failure and wait for, improved work efficiency.
Description of drawings
Fig. 1 is the composition module map of the utility model high precision adjustable current transmitter;
Fig. 2 is the signal conversion fraction schematic diagram of the utility model high precision adjustable current transmitter;
Fig. 3 is the no-load voltage ratio switching control part schematic diagram of the utility model high precision adjustable current transmitter;
Fig. 4 is that the utility model high precision adjustable current transmitter is used for the application connection layout between a switch test product of testing station.
Embodiment
As Fig. 1, Fig. 2, shown in Figure 3, a kind of high precision adjustable current transmitter of present embodiment comprises cabinet 18, and signal conversion fraction 19 and no-load voltage ratio switching control part 20 are installed in the described cabinet 18; Wherein said signal conversion fraction 19 links to each other with no-load voltage ratio switching control part 20 by circuit; Described no-load voltage ratio switching control part 20 links to each other with background monitoring main frame 30 by the RS485 bus; Described signal conversion fraction 19 links to each other with primary current mutual inductor 28 by circuit.Described signal conversion fraction 19 comprises secondary current mutual inductor (adopting whole resin-sealed) 29 and microcontactor; Described microcontactor comprises first microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16, the 7th microcontactor 17; Wherein said secondary current mutual inductor links to each other with first microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16, the 7th microcontactor 17 by circuit respectively.Described secondary current mutual inductor 29 comprises winding 35 and Secondary Winding 36; Be connected with first tap 1, second tap 2, the 3rd tap 3, the 4th tap 4, the 5th tap 5, the 6th tap 6, the 7th tap 7 on the wherein said winding 35 respectively; Wherein said first tap 1 links to each other with first microcontactor 11 by circuit; Described second tap 2 links to each other with second microcontactor 12 by circuit; Described the 3rd tap 3 links to each other with the 3rd microcontactor 13 by circuit; Described the 4th tap 4 links to each other with the 4th microcontactor 14 by circuit; Described the 5th tap 5 links to each other with the 5th microcontactor 15 by circuit; Described the 6th tap 6 links to each other with the 6th microcontactor 16 by circuit; Described first microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16 backs in parallel link to each other with primary current mutual inductor 28 with the 7th microcontactor 17 respectively by circuit; Described the 7th tap 7 links to each other with primary current mutual inductor 28 with the 7th microcontactor 17 by circuit respectively; Be connected with the 8th tap 8 and the 9th tap 9 on the described Secondary Winding 36 respectively; Be connected with power termination resistance R 1 between described the 8th tap 8 and the 9th tap 9.Described first microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16 adopt 3 utmost point main contacts microcontactors; Per 1 utmost point of 3 utmost point main contactss of described microcontactor respectively with three-phase alternating current in one link to each other.Described no-load voltage ratio switching control part 20 comprises that 8 open into the 8 IO modules of leaving, microcontactor, selector switch 10 and universal seclector 31; Wherein said selector switch 10 comprises manual contact 101 and automated contact 102; Described microcontactor comprises first microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16, the 7th microcontactor 17; Described first microcontactor 11 comprises that pull-in winding 113, first microcontactor of first microcontactor are often driven auxiliary contact 111 and the 8th microcontactor is often driven auxiliary contact 112; Described second microcontactor 12 comprises that pull-in winding 123, second microcontactor of second microcontactor are often driven auxiliary contact 121 and the 9th microcontactor is often driven auxiliary contact 122; Described the 3rd microcontactor 13 comprises that pull-in winding 133, the 3rd microcontactor of the 3rd microcontactor are often driven auxiliary contact 131 and the tenth microcontactor is often driven auxiliary contact 132; Described the 4th microcontactor 14 comprises that zygonema circle 143, the 4th microcontactor of the 4th microcontactor are often driven auxiliary contact 141 and the 11 microcontactor is often driven auxiliary contact 142; Described the 5th microcontactor 15 comprises that pull-in winding 153, the 5th microcontactor of the 5th microcontactor are often driven auxiliary contact 151 and the 12 microcontactor is often driven auxiliary contact 152; Described the 6th microcontactor 16 comprises that pull-in winding 163, the 6th microcontactor of the 6th microcontactor are often driven auxiliary contact 161 and the 13 microcontactor is often driven auxiliary contact 162; Described the 7th microcontactor 17 comprises pull-in winding 173 and the 7th microcontactor normally closed auxiliary contact 171 of the 7th microcontactor; Described first microcontactor is often driven auxiliary contact 111, second microcontactor is often driven auxiliary contact 121, the 3rd microcontactor is often driven auxiliary contact 131, the 4th microcontactor is often driven auxiliary contact 141, the 5th microcontactor is often driven auxiliary contact 151, the 6th microcontactor often open auxiliary contact 161 by the circuit parallel connection after an end and selector switch 10 connect external power source after in parallel, the pull-in winding 173 of the other end and the 7th microcontactor be connected in series (as shown in Figure 3+the 24V external power source gives the pull-in winding power supply of microcontactor, also give simultaneously 8 to open into 8 and leave the IO module for power supply ,+24V imports from the outside of cabinet); Described 8 open into the 8 IO modules of leaving comprise first leave 21, second leave the 22, the 3rd leave the 23, the 4th leave the 24, the 5th leave the 25, the 6th leave 26, minion goes out 27; Described first leaves 21 links to each other with the pull-in winding 113 of first microcontactor by circuit; Described second leaves 22 links to each other with the pull-in winding 123 of second microcontactor by circuit; The described the 3rd leaves 23 links to each other with the pull-in winding 133 of the 3rd microcontactor by circuit; The described the 4th leaves 24 links to each other with the pull-in winding 143 of the 4th microcontactor by circuit; The described the 5th leaves 25 links to each other with the pull-in winding 153 of the 5th microcontactor by circuit; The described the 6th leaves 26 links to each other with the pull-in winding 163 of the 6th microcontactor by circuit; And described first leaves 21, second leaves the 22, the 3rd and leaves the 23, the 4th and leave the 24, the 5th and leave the 25, the 6th and leave 26 by linking to each other with the 7th microcontactor normally closed auxiliary contact 171 after the circuit parallel connection again; Described universal seclector 31 comprises the first universal seclector contact 311, the second universal seclector contact 312, the 3rd universal seclector contact 313, the 4th universal seclector contact 314, the 5th universal seclector contact 315, the 6th universal seclector contact 316; The first universal seclector contact 311, the second universal seclector contact 312, the 3rd universal seclector contact 313, the 4th universal seclector contact 314, the 5th universal seclector contact 315, the 6th universal seclector contact 316 link to each other with manual contact 101 by after the circuit parallel connection again; The described first universal seclector contact 311 links to each other with the pull-in winding 113 of first microcontactor by circuit; The described second universal seclector contact 312 links to each other with the pull-in winding 123 of second microcontactor by circuit; Described the 3rd universal seclector contact 313 links to each other with the pull-in winding 133 of the 3rd microcontactor by circuit; Described the 4th universal seclector contact 314 links to each other with the pull-in winding 143 of the 4th microcontactor by circuit; Described the 5th universal seclector contact 315 links to each other with the pull-in winding 153 of the 5th microcontactor by circuit; Described the 6th universal seclector contact 316 links to each other with the pull-in winding 163 of the 6th microcontactor by circuit; The pull-in winding 113 of described first microcontactor is often driven auxiliary contact 112 by circuit and the 8th microcontactor and is linked to each other; The pull-in winding 123 of described second microcontactor is often driven auxiliary contact 122 by circuit and the 9th microcontactor and is linked to each other; The pull-in winding 133 of described the 3rd microcontactor is often driven auxiliary contact 132 by circuit and the tenth microcontactor and is linked to each other; The pull-in winding 143 of described the 4th microcontactor is often driven auxiliary contact 142 by circuit and the 11 microcontactor and is linked to each other; The pull-in winding 153 of described the 5th microcontactor is often driven auxiliary contact 152 by circuit and the 12 microcontactor and is linked to each other; The pull-in winding 163 of described the 6th microcontactor is often driven auxiliary contact 162 by circuit and the 13 microcontactor and is linked to each other; Described the 8th microcontactor is often driven auxiliary contact 112, the 9th microcontactor and is often driven auxiliary contact 122, the tenth microcontactor and often open that auxiliary contact 142 often left by auxiliary contact 132, the 11 microcontactor, the 12 microcontactor is often driven auxiliary contact 152; The 13 microcontactor is often driven auxiliary contact 162 and is gone out 27 with minion again after by the circuit parallel connection and link to each other; Described the 7th microcontactor normally closed auxiliary contact 171 goes out 27 by linking to each other with automated contact 102 after the circuit parallel connection with minion again; After pull-in winding 173 parallel connections of the pull-in winding 153 of the pull-in winding 133 of the pull-in winding 113 of described first microcontactor, the pull-in winding 123 of second microcontactor, the 3rd microcontactor, the pull-in winding 143 of the 4th microcontactor, the 5th microcontactor, the pull-in winding 163 of the 6th microcontactor, the 7th microcontactor by line-to-ground.
As shown in Figure 4, using present embodiment high precision adjustable current transmitter in the high-power test station measures the electric current in the switch disconnector process of the test.The current signal that collects in the primary current mutual inductor 28 is sent in the present embodiment high precision adjustable current transmitter 32, places automated contact 101 times in selector switch 10, background monitoring master, the 30 IO modules by the total line traffic control transmitter of RS485 inside.As shown in Figure 3, make first of IO module leave 21 closures, 11 adhesives of first microcontactor, its 8th microcontactor is often opened auxiliary contact 112 closed realization self-lockings.Its first microcontactor is often opened auxiliary contact 111 closures and is made 17 adhesives of the 7th microcontactor.The 7th microcontactor normally closed auxiliary contact 171 disconnects, and cuts off first and leaves 21, second and leave the 22, the 3rd and leave the 23, the 4th and leave the 24, the 5th and leave the 25, the 6th and leave 26 power supply, and other microcontactor 12 ~ 16 is lived in locking, makes their akinesias.This moment, the main contact of first microcontactor 11 was connected first tap 1 of secondary current mutual inductor 29 as shown in Figure 2, and the 7th microcontactor normally closed auxiliary contact 171 disconnects simultaneously.The current signal of gathering flows into a winding 35 of secondary current mutual inductor 29, and amplitude 5V of output supplies high speed acquisition main frame 33 record current data with interior small voltage signal on its Secondary Winding 36.Background monitoring main frame 30 controls first are immediately left 21 and are disconnected, and this has just finished the handoff procedure of a Remote no-load voltage ratio.If need conversion no-load voltage ratio again, background monitoring master 30 is as long as the control minion goes out 27 disconnections earlier, all microcontactors (first microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16, the 7th microcontactor 17) are discharged return to original state, discharge minion immediately and go out 27.And then carry out above-mentioned no-load voltage ratio handoff procedure, background monitoring main frame 30 can be selected to control first of IO module as required and leave 21, second and leave the 22, the 3rd and leave the 23, the 4th and leave the 24, the 5th and leave the 25, the 6th closure of leaving in 26, an adhesive in the first corresponding microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16 just can realize that different no-load voltage ratios switched.Above-mentioned whole control process all is that the backstage Remote is automatically realized, does not need the artificial wiring that has a power failure, and controls flexiblely, has improved work efficiency.Mate different no-load voltage ratios according to the size of sample rate current and come switching signal, improved the precision of measuring.The secondary current mutual inductor 29 of present embodiment transmitter has adopted nano amorphous magnetic core simultaneously, and Fs is less for the instrument safety coefficient, and measuring accuracy is better than 0.2 grade.
If in some cases, think manual switchover no-load voltage ratio on the spot, only need selector switch 10 is placed manual contact 102 times, rotate six grades of universal seclectors 31 then, just can realize the switching of six grades of no-load voltage ratios of this transmitter.It is convenient also to switch no-load voltage ratio than the traditional wired mode, and real-time is good, and is safe.
Background monitoring main frame 30 can connect the high precision adjustable current transmitter of many playscripts with stage directions embodiment by the RS485 bus, and many transmitters are installed in the same switch board, can be simultaneously carry out current measurement to the switch test between a plurality of test products.Improved usage ratio of equipment and personnel's work efficiency.In addition, background monitoring main frame and high speed acquisition main frame also may be incorporated on the main frame and realize among Fig. 4, also do not influence the application to the utility model transmitter.
Claims (6)
1. a high precision adjustable current transmitter is characterized in that comprising cabinet (18), and signal conversion fraction (19) and no-load voltage ratio switching control part (20) are installed in the described cabinet (18); Wherein said signal conversion fraction (19) links to each other with no-load voltage ratio switching control part (20) by circuit; Described no-load voltage ratio switching control part (20) links to each other with background monitoring main frame (30) by the RS485 bus; Described signal conversion fraction (19) links to each other with primary current mutual inductor (28) by circuit.
2. a kind of high precision adjustable current transmitter according to claim 1 is characterized in that described signal conversion fraction (19) comprises secondary current mutual inductor (29) and microcontactor; Described microcontactor comprises first microcontactor (11), second microcontactor (12), the 3rd microcontactor (13), the 4th microcontactor (14), the 5th microcontactor (15), the 6th microcontactor (16), the 7th microcontactor (17); Wherein said secondary current mutual inductor (29) links to each other with first microcontactor (11), second microcontactor (12), the 3rd microcontactor (13), the 4th microcontactor (14), the 5th microcontactor (15), the 6th microcontactor (16), the 7th microcontactor (17) by circuit respectively.
3. a kind of high precision adjustable current transmitter according to claim 2 is characterized in that described secondary current mutual inductor (29) comprises a winding (35) and Secondary Winding (36); Be connected with first tap (1), second tap (2), the 3rd tap (3), the 4th tap (4), the 5th tap (5), the 6th tap (6), the 7th tap (7) on the wherein said winding (35) respectively; Wherein said first tap (1) links to each other with first microcontactor (11) by circuit; Described second tap (2) links to each other with second microcontactor (12) by circuit; Described the 3rd tap (3) links to each other with the 3rd microcontactor (13) by circuit; Described the 4th tap (4) links to each other with the 4th microcontactor (14) by circuit; Described the 5th tap (5) links to each other with the 5th microcontactor (15) by circuit; Described the 6th tap (6) links to each other with the 6th microcontactor (16) by circuit; Described first microcontactor (11), second microcontactor (12), the 3rd microcontactor (13), the 4th microcontactor (14), the 5th microcontactor (15), the 6th microcontactor (16) back in parallel link to each other with primary current mutual inductor (28) with the 7th microcontactor (17) respectively by circuit; Described the 7th tap (7) links to each other with primary current mutual inductor (28) with the 7th microcontactor (17) by circuit respectively; Be connected with the 8th tap (8) and the 9th tap (9) on the described Secondary Winding (36) respectively; Be connected with power termination resistance R 1 between described the 8th tap (8) and the 9th tap (9).
4. according to claim 2 or 3 described a kind of high precision adjustable current transmitters, it is characterized in that described first microcontactor (11), second microcontactor (12), the 3rd microcontactor (13), the 4th microcontactor (14), the 5th microcontactor (15), the 6th microcontactor (16) adopt 3 utmost point main contacts microcontactors; Per 1 utmost point of 3 utmost point main contactss of described microcontactor respectively with three-phase alternating current in one link to each other.
5. according to claim 2 or 3 described a kind of high precision adjustable current transmitters, it is whole resin-sealed to it is characterized in that described secondary current mutual inductor (29) adopts.
6. according to claim 2 or 3 described a kind of high precision adjustable current transmitters, it is characterized in that described no-load voltage ratio switching control part (20) comprises that 8 open into the 8 IO modules of leaving, microcontactor, selector switch (10) and universal seclector (31); Wherein said selector switch (10) comprises manual contact (101) and automated contact (102); Described first microcontactor (11) comprises that pull-in winding (113), first microcontactor of first microcontactor are often driven auxiliary contact (111) and the 8th microcontactor is often driven auxiliary contact (112); Described second microcontactor (12) comprises that pull-in winding (123), second microcontactor of second microcontactor are often driven auxiliary contact (121) and the 9th microcontactor is often driven auxiliary contact (122); Described the 3rd microcontactor (13) comprises that pull-in winding (133), the 3rd microcontactor of the 3rd microcontactor are often driven auxiliary contact (131) and the tenth microcontactor is often driven auxiliary contact (132); Described the 4th microcontactor (14) comprises that pull-in winding (143), the 4th microcontactor of the 4th microcontactor are often driven auxiliary contact (141) and the 11 microcontactor is often driven auxiliary contact (142); Described the 5th microcontactor (15) comprises that pull-in winding (153), the 5th microcontactor of the 5th microcontactor are often driven auxiliary contact (151) and the 12 microcontactor is often driven auxiliary contact (152); Described the 6th microcontactor (16) comprises that pull-in winding (163), the 6th microcontactor of the 6th microcontactor are often driven auxiliary contact (161) and the 13 microcontactor is often driven auxiliary contact (162); Described the 7th microcontactor (17) comprises pull-in winding (173) and the 7th microcontactor normally closed auxiliary contact (171) of the 7th microcontactor; Described first microcontactor is often driven auxiliary contact (111), second microcontactor and is often driven auxiliary contact (121), the 3rd microcontactor and often drive auxiliary contact (131), the 4th microcontactor and often open that auxiliary contact (151) often left by auxiliary contact (141), the 5th microcontactor, the 6th microcontactor is often driven auxiliary contact (161) by after the circuit parallel connection, one end with connect external power source after selector switch (10) is in parallel, the pull-in winding (173) of the other end and the 7th microcontactor is connected in series; Described 8 open into the 8 IO modules of leaving and comprise that first leaves (21), second and leave (22), the 3rd and leave (23), the 4th and leave (24), the 5th and leave that (25), the 6th leave (26), minion goes out (27); Described first leaves (21) links to each other with the pull-in winding (113) of first microcontactor by circuit; Described second leaves (22) links to each other with the pull-in winding (123) of second microcontactor by circuit; The described the 3rd leaves (23) links to each other with the pull-in winding (133) of the 3rd microcontactor by circuit; The described the 4th leaves (24) links to each other with the pull-in winding (143) of the 4th microcontactor by circuit; The described the 5th leaves (25) links to each other with the pull-in winding (153) of the 5th microcontactor by circuit; The described the 6th leaves (26) links to each other with the pull-in winding (163) of the 6th microcontactor by circuit; And described first leaves (21), second leaves (22), the 3rd and leaves (23), the 4th and leave (24), the 5th and leave (25), the 6th and leave (26) by linking to each other with the 7th microcontactor normally closed auxiliary contact (171) after the circuit parallel connection again; Described universal seclector (31) comprises the first universal seclector contact (311), the second universal seclector contact (312), the 3rd universal seclector contact (313), the 4th universal seclector contact (314), the 5th universal seclector contact (315), the 6th universal seclector contact (316); The first universal seclector contact (311), the second universal seclector contact (312), the 3rd universal seclector contact (313), the 4th universal seclector contact (314), the 5th universal seclector contact (315), the 6th universal seclector contact (316) link to each other with manual contact (101) by after the circuit parallel connection again; The described first universal seclector contact (311) links to each other with the pull-in winding (113) of first microcontactor by circuit; The described second universal seclector contact (312) links to each other with the pull-in winding (123) of second microcontactor by circuit; Described the 3rd universal seclector contact (313) links to each other with the pull-in winding (133) of the 3rd microcontactor by circuit; Described the 4th universal seclector contact (314) links to each other with the pull-in winding (143) of the 4th microcontactor by circuit; Described the 5th universal seclector contact (315) links to each other with the pull-in winding (153) of the 5th microcontactor by circuit; Described the 6th universal seclector contact (316) links to each other with the pull-in winding (163) of the 6th microcontactor by circuit; The pull-in winding of described first microcontactor (113) is often driven auxiliary contact (112) by circuit and the 8th microcontactor and is linked to each other; The pull-in winding of described second microcontactor (123) is often driven auxiliary contact (122) by circuit and the 9th microcontactor and is linked to each other; The pull-in winding of described the 3rd microcontactor (133) is often driven auxiliary contact (132) by circuit and the tenth microcontactor and is linked to each other; The pull-in winding of described the 4th microcontactor (143) is often driven auxiliary contact (142) by circuit and the 11 microcontactor and is linked to each other; The pull-in winding of described the 5th microcontactor (153) is often driven auxiliary contact (152) by circuit and the 12 microcontactor and is linked to each other; The pull-in winding of described the 6th microcontactor (163) is often driven auxiliary contact (162) by circuit and the 13 microcontactor and is linked to each other; Described the 8th microcontactor is often driven auxiliary contact (112), the 9th microcontactor and is often driven auxiliary contact (122), the tenth microcontactor and often open that auxiliary contact (142) often left by auxiliary contact (132), the 11 microcontactor, the 12 microcontactor is often driven auxiliary contact (152); The 13 microcontactor is often driven auxiliary contact (162) and is gone out (27) with minion again after by the circuit parallel connection and link to each other; Described the 7th microcontactor normally closed auxiliary contact (171) and minion go out (27) and link to each other with automated contact (102) after by the circuit parallel connection again; After the pull-in winding (163) of the pull-in winding (143) of the pull-in winding (123) of the pull-in winding of described first microcontactor (113), second microcontactor, the pull-in winding (133) of the 3rd microcontactor, the 4th microcontactor, the pull-in winding (153) of the 5th microcontactor, the 6th microcontactor, pull-in winding (173) parallel connection of the 7th microcontactor by line-to-ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320113895 CN203191429U (en) | 2013-03-13 | 2013-03-13 | High-precision adjustable current transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320113895 CN203191429U (en) | 2013-03-13 | 2013-03-13 | High-precision adjustable current transmitter |
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| Publication Number | Publication Date |
|---|---|
| CN203191429U true CN203191429U (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320113895 Expired - Lifetime CN203191429U (en) | 2013-03-13 | 2013-03-13 | High-precision adjustable current transmitter |
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| CN (1) | CN203191429U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163347A (en) * | 2013-03-13 | 2013-06-19 | 绍兴电力局 | Adjustable current transducer with high accuracy |
| CN105445535A (en) * | 2015-12-04 | 2016-03-30 | 重庆鸿引电子有限公司 | Digital current transducer and detection device |
| CN108931699A (en) * | 2018-04-28 | 2018-12-04 | 孝感华工高理电子有限公司 | DC break down voltage test device |
-
2013
- 2013-03-13 CN CN 201320113895 patent/CN203191429U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103163347A (en) * | 2013-03-13 | 2013-06-19 | 绍兴电力局 | Adjustable current transducer with high accuracy |
| CN105445535A (en) * | 2015-12-04 | 2016-03-30 | 重庆鸿引电子有限公司 | Digital current transducer and detection device |
| CN108931699A (en) * | 2018-04-28 | 2018-12-04 | 孝感华工高理电子有限公司 | DC break down voltage test device |
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