CN103163347B - Adjustable current transducer with high accuracy - Google Patents
Adjustable current transducer with high accuracy Download PDFInfo
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- CN103163347B CN103163347B CN201310079791.7A CN201310079791A CN103163347B CN 103163347 B CN103163347 B CN 103163347B CN 201310079791 A CN201310079791 A CN 201310079791A CN 103163347 B CN103163347 B CN 103163347B
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Abstract
The invention discloses an adjustable current transducer with high accuracy. The adjustable current transducer comprises a case, wherein a signal transformation portion and a transformation ratio switching control portion are installed in the case, the signal transformation portion is connected with the transformation ratio switching control portion through circuits, the transformation ratio switching control portion is connected with a background monitor host through a RS485 bus, and the signal transformation portion is connected with a primary current transformer through circuits. The adjustable current transducer translates current signals collected by a traditional primary current transformer into low voltage signals within +-5V, can adjust transformation ratios on line according to the size of an electric current so as to distribute the voltage signals obtained by translating the current signals in a scope of +-5V in large magnitude mode, and therefore improves measuring accuracy, is also suitable for other electricity systems needing wide range electric current measurement, and especially has a cost advantage on transformation of traditional equipment.
Description
Technical field
The present invention relates to a kind of adjustable current transducer with high accuracy, be specifically related to one to collect current signal be converted to small voltage signal for high-speed data acquisition main frame directly from high-voltage great-current circuit, simultaneously at the high precision electro flow transmitter by no-load voltage ratio can be converted in current signal transfer process, belong to the current measure device technical field in powerful device experimental test process in electric system real-time online.
Background technology
Often need in electric system testing station testing equipments such as isolating switch, capacitor, reactor, fuse, filter, SVG, often all need to detect the change of the current signal of system in test process.But the electric pressure of these tests, size of current all can be different, even same equipment also has the test request worked under different load currents.This just requires that our test environment can both be measured the electric current of this wide variation, therefore, it is possible to adapt to wide region, the high precision electro flow measurement device of many grades of adjustable no-load voltage ratios is needed.In traditional testing station, or be that no-load voltage ratio is single, measuring accuracy is not high; Be need artificial wiring to change no-load voltage ratio, must have a power failure wait, takes time and effort.Simultaneously along with the development of modern electric, people require more and more higher to robotization, and the mode of this field modification wiring, security, dirigibility and aesthetics obviously do not meet the demand in epoch yet.
Summary of the invention
The object of the present invention is to provide a kind of adjustable current transducer with high accuracy, by the current signal collected in traditional primary current mutual inductor CT is converted into ± 5V within small voltage signal, and can according to the size on-line control no-load voltage ratio of electric current, with in the scope of being distributed in by a larger margin of voltage signal after making conversion ± 5V, thus improve the precision measured.Simultaneously ± 5V voltage signal is also suitable for the collection of main frame and does not need to carry out the conversion of signal again, applying and having applicability equally, being particularly the transformation to legacy equipment has more cost advantage for requiring other electric system of wide region current measurement.
In order to achieve the above object, technical scheme of the present invention is:
A kind of adjustable current transducer with high accuracy, comprises cabinet, is provided with signal conversion fraction and no-load voltage ratio switching control part in described cabinet; Wherein said signal conversion fraction is connected with no-load voltage ratio switching control part by circuit; Described no-load voltage ratio switching control part is connected with background monitoring main frame by RS485 bus; Described signal conversion fraction is connected with primary current mutual inductor by circuit.
Described signal conversion fraction comprises secondary current mutual inductor and microcontactor; Described microcontactor comprises the first microcontactor, the second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor, the 7th microcontactor; Wherein said secondary current mutual inductor is connected with the first microcontactor, the second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor, the 7th microcontactor respectively by circuit.
Described secondary current mutual inductor comprises a winding and Secondary Winding; A wherein said winding is connected to the first tap, the second tap, the 3rd tap, the 4th tap, the 5th tap, the 6th tap, the 7th tap; The first wherein said tap is connected with the first microcontactor by circuit; The second described tap is connected with the second microcontactor by circuit; The 3rd described tap is connected with the 3rd microcontactor by circuit; The 4th described tap is connected with the 4th microcontactor by circuit; The 5th described tap is connected with the 5th microcontactor by circuit; The 6th described tap is connected with the 6th microcontactor by circuit; Be connected with primary current mutual inductor with the 7th microcontactor respectively by circuit after the first described microcontactor, the second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor parallel connection; The 7th described tap is connected with primary current mutual inductor with the 7th microcontactor respectively by circuit; Described Secondary Winding is connected to the 8th tap and the 9th tap; Power termination resistance R1 is connected with between the 8th described tap and the 9th tap.
The first described microcontactor, the second microcontactor, the 3rd microcontactor, the 4th microcontactor, the 5th microcontactor, the 6th microcontactor adopt 3 pole main contacts microcontactors; Every 1 pole of 3 pole main contactss of described microcontactor is connected with one in three-phase alternating current respectively.
Described secondary current mutual inductor adopts overall resin seal.
Described no-load voltage ratio switching control part comprises 8 and drives I/O module, microcontactor, selector switch and the universal seclector outputed into 8; Wherein said selector switch comprises manual contact and automated contact; The first described microcontactor comprise the first microcontactor pull-in winding, the first microcontactor often drives auxiliary contact and the 8th microcontactor often drives auxiliary contact; The second described microcontactor comprise the second microcontactor pull-in winding, the second microcontactor often drives auxiliary contact and the 9th microcontactor often drives auxiliary contact; The 3rd described microcontactor comprise the 3rd microcontactor pull-in winding, the 3rd microcontactor often drives auxiliary contact and the tenth microcontactor often drives auxiliary contact; The 4th described microcontactor comprise the 4th microcontactor pull-in winding, the 4th microcontactor often drives auxiliary contact and the 11 microcontactor often drives auxiliary contact; The 5th described microcontactor comprise the 5th microcontactor pull-in winding, the 5th microcontactor often drives auxiliary contact and the 12 microcontactor often drives auxiliary contact; The 6th described microcontactor comprise the 6th microcontactor pull-in winding, the 6th microcontactor often drives auxiliary contact and the 13 microcontactor often drives auxiliary contact; The 7th described microcontactor comprises pull-in winding and the 7th microcontactor normally closed auxiliary contact of the 7th microcontactor; The first described microcontactor often drives auxiliary contact, the second microcontactor often drives auxiliary contact, the 3rd microcontactor often drives auxiliary contact, the 4th microcontactor often drives auxiliary contact, the 5th microcontactor often drives auxiliary contact, the 6th microcontactor often drives auxiliary contact by after lines in parallel, external power source is connect after one end is in parallel with selector switch, the pull-in winding of the other end and the 7th microcontactor is connected in series (external power source is powered to the control coil of microcontactor, also opens to 8 simultaneously and outputs I/O module into 8 and power); Described 8 open the I/O module outputed into 8 comprises and first to output, second to output, the 3rd to output, the 4th to output, the 5th to output, the 6th to output, the 7th to output; Described first is outputed and is connected by the pull-in winding of circuit with the first microcontactor; Described second is outputed and is connected by the pull-in winding of circuit with the second microcontactor; Described the 3rd is outputed and is connected by the pull-in winding of circuit with the 3rd microcontactor; Described the 4th is outputed and is connected by the pull-in winding of circuit with the 4th microcontactor; Described the 5th is outputed and is connected by the pull-in winding of circuit with the 5th microcontactor; Described the 6th is outputed and is connected by the pull-in winding of circuit with the 6th microcontactor; And described first outputing, second to output, the 3rd to output, the 4th to output, the 5th to output, the 6th outputing by being connected with the 7th microcontactor normally closed auxiliary contact again after lines in parallel; 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 first described 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 are connected with manual contact by after lines in parallel again; The first described universal seclector contact is connected by the pull-in winding of circuit with the first microcontactor; The second described universal seclector contact is connected by the pull-in winding of circuit with the second microcontactor; The 3rd described universal seclector contact is connected by the pull-in winding of circuit with the 3rd microcontactor; The 4th described universal seclector contact is connected by the pull-in winding of circuit with the 4th microcontactor; The 5th described universal seclector contact is connected by the pull-in winding of circuit with the 5th microcontactor; The 6th described universal seclector contact is connected by the pull-in winding of circuit with the 6th microcontactor; The pull-in winding of the first described microcontactor is often driven auxiliary contact by circuit with the 8th microcontactor and is connected; The pull-in winding of the second described microcontactor is often driven auxiliary contact by circuit with the 9th microcontactor and is connected; The pull-in winding of the 3rd described microcontactor is often driven auxiliary contact by circuit with the tenth microcontactor and is connected; The pull-in winding of the 4th described microcontactor is often driven auxiliary contact by circuit with the 11 microcontactor and is connected; The pull-in winding of the 5th described microcontactor is often driven auxiliary contact by circuit with the 12 microcontactor and is connected; The pull-in winding of the 6th described microcontactor is often driven auxiliary contact by circuit with the 13 microcontactor and is connected; The 8th described microcontactor often drives auxiliary contact, the 9th microcontactor often drives auxiliary contact, the tenth microcontactor often drives auxiliary contact, the 11 microcontactor often drives auxiliary contact, the 12 microcontactor often drives auxiliary contact, the 13 microcontactor is often driven auxiliary contact and is connected by outputing with the 7th after lines in parallel again; Described the 7th microcontactor normally closed auxiliary contact and the 7th is outputed by being connected with automated contact after lines in parallel again; Line-to-ground is passed through after the pull-in winding parallel connection of the pull-in winding of the pull-in winding of the pull-in winding of the first described microcontactor, the pull-in winding of the second microcontactor, the 3rd microcontactor, the pull-in winding of the 4th microcontactor, the 5th microcontactor, the pull-in winding of the 6th microcontactor, the 7th microcontactor.
The invention has the beneficial effects as follows: a kind of adjustable current transducer with high accuracy of the present invention, adopt a multitap secondary current mutual inductor of a winding strap, current signal will be collected be converted to small voltage signal for high-speed data acquisition main frame directly from high-voltage great-current circuit.Have the following advantages: the design 1) adopting many grades of no-load voltage ratios, improve the resolution of current measurement, and then improve the precision of measurement.2) signal is changed and is converted in the whole signalling channel of no-load voltage ratio and do not introduce nonlinear device, and adopt how tapped secondary current mutual inductor direct-coupling switching signal, the measurement data linearity of output is good, is conducive to the raising of measuring accuracy.4) utilize I/O module, universal seclector and contactor, achieve manual and Remote two kinds of control modes on the spot, the tap-change access of on line real time control current transformer, can real-time online conversion no-load voltage ratio.Eliminate the loaded down with trivial details of field wiring, do not need to have a power failure and wait for, improve work efficiency.5) from different CT with the use of the circuit that can be applicable to different electric pressure, applicable scope is wide.6) described transmitter entirety does not comprise high-pressure section, and therefore it can be placed in the device cabinet of Power Secondary side.In installation and use procedure, safety coefficient improves greatly.Again because have employed integrated apparatus structural design, be placed in device cabinet monnolithic case attractive in appearance, installation process is simple at the scene, easy-to-connect.7) control section described in have employed fieldbus RS485 and background monitoring host communication.User of service can Remote real-time transform no-load voltage ratio, and also can monitor whole control procedure execution result, reliability is high.A background monitoring main frame is monitored multiple stage transmitter in real time by RS485 bus simultaneously.Improve the utilization factor of the equipment such as ability and background host computer of operating personnel's parallel processing transaction.The present invention adopts integrated apparatus structure, has volume little, good looking appearance, and wiring is few, and antijamming capability is strong, and safe reliability is high, flexibly easy for installation, convenient advantage of installing in various cabinet and scene.In the process of current measurement, eliminate the loaded down with trivial details of field wiring, do not need to have a power failure and wait for, improve work efficiency.
Accompanying drawing explanation
Fig. 1 is the comprising modules figure of adjustable current transducer with high accuracy of the present invention;
Fig. 2 is the signal conversion fraction schematic diagram of adjustable current transducer with high accuracy of the present invention;
Fig. 3 is the no-load voltage ratio switching control part schematic diagram of adjustable current transducer with high accuracy of the present invention;
Fig. 4 is that adjustable current transducer with high accuracy of the present invention is for the application connection layout between the switch test product of in testing station.
Embodiment
Embodiment 1
As shown in Figure 1, Figure 2, Figure 3 shows, a kind of adjustable current transducer with high accuracy of the present embodiment, comprises cabinet 18, is provided with signal conversion fraction 19 and no-load voltage ratio switching control part 20 in described cabinet 18; Wherein said signal conversion fraction 19 is connected with no-load voltage ratio switching control part 20 by circuit; Described no-load voltage ratio switching control part 20 is connected with background monitoring main frame 30 by RS485 bus; Described signal conversion fraction 19 is connected with primary current mutual inductor 28 by circuit.Described signal conversion fraction 19 comprises secondary current mutual inductor (adopting overall resin seal) 29 and microcontactor; Described microcontactor comprises the 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 is connected with the 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 respectively by circuit.Described secondary current mutual inductor 29 comprises a winding 35 and Secondary Winding 36; A wherein said winding 35 is connected to the 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; The first wherein said tap 1 is connected with the first microcontactor 11 by circuit; The second described tap 2 is connected with the second microcontactor 12 by circuit; The 3rd described tap 3 is connected with the 3rd microcontactor 13 by circuit; The 4th described tap 4 is connected with the 4th microcontactor 14 by circuit; The 5th described tap 5 is connected with the 5th microcontactor 15 by circuit; The 6th described tap 6 is connected with the 6th microcontactor 16 by circuit; Be connected with primary current mutual inductor 28 with the 7th microcontactor 17 respectively by circuit after the first described microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16 parallel connection; The 7th described tap 7 is connected with primary current mutual inductor 28 with the 7th microcontactor 17 respectively by circuit; Described Secondary Winding 36 is connected to the 8th tap 8 and the 9th tap 9; Power termination resistance R1 is connected with between the 8th described tap 8 and the 9th tap 9.The first described microcontactor 11, second microcontactor 12, the 3rd microcontactor 13, the 4th microcontactor 14, the 5th microcontactor 15, the 6th microcontactor 16 adopt 3 pole main contacts microcontactors; Every 1 pole of 3 pole main contactss of described microcontactor is connected with one in three-phase alternating current respectively.Described no-load voltage ratio switching control part 20 comprises 8 and drives I/O module, microcontactor, selector switch 10 and the universal seclector 31 outputed into 8, wherein said selector switch 10 comprises manual contact 101 and automated contact 102, described microcontactor comprises the 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, pull-in winding 113, first microcontactor that the first described microcontactor 11 comprises the first microcontactor often drives auxiliary contact 111 and the 8th microcontactor often drives auxiliary contact 112, pull-in winding 123, second microcontactor that the second described microcontactor 12 comprises the second microcontactor often drives auxiliary contact 121 and the 9th microcontactor often drives auxiliary contact 122, the 3rd described microcontactor 13 comprise the 3rd microcontactor pull-in winding 133, the 3rd microcontactor often drives auxiliary contact 131 and the tenth microcontactor often drives auxiliary contact 132, the 4th described microcontactor 14 comprises the zygonema circle 143 of the 4th microcontactor, the 4th microcontactor is often opened auxiliary contact the 141 and the 11 microcontactor and often driven auxiliary contact 142, the 5th described microcontactor 15 comprises the pull-in winding 153 of the 5th microcontactor, the 5th microcontactor is often opened auxiliary contact the 151 and the 12 microcontactor and often driven auxiliary contact 152, the 6th described microcontactor 16 comprises the pull-in winding 163 of the 6th microcontactor, the 6th microcontactor is often opened auxiliary contact the 161 and the 13 microcontactor and often driven auxiliary contact 162, the 7th described microcontactor 17 comprises pull-in winding 173 and the 7th microcontactor normally closed auxiliary contact 171 of the 7th microcontactor, the first described microcontactor often drives auxiliary contact 111, second microcontactor often drives auxiliary contact 121, 3rd microcontactor often drives auxiliary contact 131, 4th microcontactor often drives auxiliary contact 141, 5th microcontactor often drives auxiliary contact 151, 6th microcontactor often open auxiliary contact 161 in parallel with selector switch 10 by one end after lines in parallel after connect external power source, the pull-in winding 173 of the other end and the 7th microcontactor is connected in series that (+24V external power source is as shown in Figure 3 powered to the pull-in winding of microcontactor, also open to 8 simultaneously and output I/O module into 8 and power, + 24V inputs from the outside of cabinet), described 8 open the I/O module outputed into 8 comprises first and outputs 21, second and output the 22, the 3rd and output the 23, the 4th and output the 24, the 5th and output the 25, the 6th and output the 26, the 7th and output 27, described first outputs 21 is connected with the pull-in winding 113 of the first microcontactor by circuit, described second outputs 22 is connected with the pull-in winding 123 of the second microcontactor by circuit, described the 3rd outputs 23 is connected by the pull-in winding 133 of circuit with the 3rd microcontactor, described the 4th outputs 24 is connected by the pull-in winding 143 of circuit with the 4th microcontactor, described the 5th outputs 25 is connected by the pull-in winding 153 of circuit with the 5th microcontactor, described the 6th outputs 26 is connected by the pull-in winding 163 of circuit with the 6th microcontactor, and described first outputs 21, second and outputs the 22, the 3rd and output the 23, the 4th and output the 24, the 5th and output the 25, the 6th and output 26 by being connected with the 7th microcontactor normally closed auxiliary contact 171 after lines in parallel again, described universal seclector 31 comprises the first universal seclector contact 312, universal seclector contact 311, second, the 3rd universal seclector contact 313, the 4th universal seclector contact 314, the 5th universal seclector contact 315, the 6th universal seclector contact 316, first universal seclector contact 312, universal seclector contact 311, second, the 3rd universal seclector contact 313, the 4th universal seclector contact 314, the 5th universal seclector contact 315, the 6th universal seclector contact 316 are connected with manual contact 101 by after lines in parallel again, the first described universal seclector contact 311 is connected with the pull-in winding 113 of the first microcontactor by circuit, the second described universal seclector contact 312 is connected with the pull-in winding 123 of the second microcontactor by circuit, the 3rd described universal seclector contact 313 is connected by the pull-in winding 133 of circuit with the 3rd microcontactor, the 4th described universal seclector contact 314 is connected by the pull-in winding 143 of circuit with the 4th microcontactor, the 5th described universal seclector contact 315 is connected by the pull-in winding 153 of circuit with the 5th microcontactor, the 6th described universal seclector contact 316 is connected by the pull-in winding 163 of circuit with the 6th microcontactor, the pull-in winding 113 of the first described microcontactor is often driven auxiliary contact 112 by circuit with the 8th microcontactor and is connected, the pull-in winding 123 of the second described microcontactor is often driven auxiliary contact 122 by circuit with the 9th microcontactor and is connected, the pull-in winding 133 of the 3rd described microcontactor is often driven auxiliary contact 132 by circuit with the tenth microcontactor and is connected, the pull-in winding 143 of the 4th described microcontactor is often driven auxiliary contact 142 by circuit with the 11 microcontactor and is connected, the pull-in winding 153 of the 5th described microcontactor is often driven auxiliary contact 152 by circuit with the 12 microcontactor and is connected, the pull-in winding 163 of the 6th described microcontactor is often driven auxiliary contact 162 by circuit with the 13 microcontactor and is connected, the 8th described microcontactor often drives auxiliary contact 112, the 9th microcontactor often drives auxiliary contact 122, the tenth microcontactor is often opened auxiliary contact the 132, the 11 microcontactor and often opened auxiliary contact the 142, the 12 microcontactor and often drive auxiliary contact 152, 13 microcontactor is often driven auxiliary contact 162 and is connected by outputing 27 with the 7th again after lines in parallel, described the 7th microcontactor normally closed auxiliary contact 171 and the 7th outputs 27 by being connected with automated contact 102 after lines in parallel again, line-to-ground is passed through after the pull-in winding 163 of the pull-in winding 143 of the pull-in winding 123 of pull-in winding 113, second microcontactor of the first described 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.
As shown in Figure 4, in High power test station, apply the present embodiment adjustable current transducer with high accuracy to measure the electric current in switch disconnector process of the test.The current signal collected in primary current mutual inductor 28 is sent in the present embodiment adjustable current transducer with high accuracy 32, is placed in automated contact 101 times, background monitoring master in selector switch 10, and 30 by the I/O module of RS485 bus marco transmitter inside.As shown in Figure 3, make first of I/O module to output 21 and close, the first microcontactor 11 adhesive, its 8th microcontactor often opens that auxiliary contact 112 are closed realizes self-locking.Its first microcontactor often opens that auxiliary contact 111 are closed makes the 7th microcontactor 17 adhesive.7th microcontactor normally closed auxiliary contact 171 disconnects, and cut off first and output 21, second and output the 22, the 3rd and output the 23, the 4th and output the 24, the 5th and output the power supply that the 25, the 6th outputs 26, other microcontactor 12 ~ 16 is lived in locking, makes their akinesias.Now as shown in Figure 2, the main contact of the first microcontactor 11 connects the first tap 1 of secondary current mutual inductor 29, and the 7th microcontactor normally closed auxiliary contact 171 disconnects simultaneously.The current signal gathered flows into a winding 35 of secondary current mutual inductor 29, and the small voltage signal its Secondary Winding 36 exported within an amplitude 5V supplies high speed acquisition main frame 33 record current data.Background monitoring main frame 30 controls first and outputs 21 disconnections immediately, this completes the handoff procedure of a Remote no-load voltage ratio.If again no-load voltage ratio need be converted, as long as background monitoring master 30 first controls the 7th and outputs 27 disconnections, all microcontactors (the 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 and returns to original state, discharge the 7th immediately and output 27.And then perform above-mentioned no-load voltage ratio handoff procedure, background monitoring main frame 30 can be selected to control first of I/O module as required and output 21, second and output the 22, the 3rd and output the 23, the 4th and output the 24, the 5th and output the 25, the 6th and output in 26 one and close, 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 different no-load voltage ratios and have switched.Above-mentioned whole control procedure is all that backstage Remote realizes automatically, does not need the artificial wiring that has a power failure, and controls flexible, improves work efficiency.Mate different no-load voltage ratio according to the size of sample rate current and carry out switching signal, improve the precision of measurement.The secondary current mutual inductor 29 of the present embodiment transmitter have employed nano amorphous magnetic core simultaneously, and Safety factor Fs is less, and measuring accuracy is better than 0.2 grade.
If in some cases, think manual switchover no-load voltage ratio on the spot, only selector switch 10 need be placed in manual contact 102 times, then rotate six grades of universal seclectors 31, just can realize have switched of six grades of no-load voltage ratios of this transmitter.Also comparatively traditional wired mode switches no-load voltage ratio conveniently, and real-time is good, and security is high.
Background monitoring main frame 30 can connect the adjustable current transducer with high accuracy of multiple stage the present embodiment by RS485 bus, is installed on by multiple stage transmitter in same switch board, can carry out current measurement to the switch test in multiple test product simultaneously.Improve the utilization factor of equipment, and the work efficiency of personnel.In addition, in Fig. 4, background monitoring main frame and high speed acquisition main frame also may be incorporated on a main frame and realize, and also do not affect the application to transmitter of the present invention.
Claims (5)
1. an adjustable current transducer with high accuracy, is characterized in that comprising cabinet (18), is provided with signal conversion fraction (19) and no-load voltage ratio switching control part (20) in described cabinet (18); Wherein said signal conversion fraction (19) is connected with no-load voltage ratio switching control part (20) by circuit; Described no-load voltage ratio switching control part (20) is connected with background monitoring main frame (30) by RS485 bus; Described signal conversion fraction (19) is connected with primary current mutual inductor (28) by circuit;
Described signal conversion fraction (19) comprises secondary current mutual inductor (29) and microcontactor; Described microcontactor comprises the first microcontactor (11), the 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) is connected with the first microcontactor (11), the second microcontactor (12), the 3rd microcontactor (13), the 4th microcontactor (14), the 5th microcontactor (15), the 6th microcontactor (16), the 7th microcontactor (17) respectively by circuit.
2. a kind of adjustable current transducer with high accuracy according to claim 1, is characterized in that described secondary current mutual inductor (29) comprises a winding (35) and Secondary Winding (36); A wherein said winding (35) is connected to the first tap (1), the second tap (2), the 3rd tap (3), the 4th tap (4), the 5th tap (5), the 6th tap (6), the 7th tap (7); Wherein said the first tap (1) is connected with the first microcontactor (11) by circuit; Described the second tap (2) is connected with the second microcontactor (12) by circuit; The 3rd described tap (3) is connected with the 3rd microcontactor (13) by circuit; The 4th described tap (4) is connected with the 4th microcontactor (14) by circuit; The 5th described tap (5) is connected with the 5th microcontactor (15) by circuit; The 6th described tap (6) is connected with the 6th microcontactor (16) by circuit; Be connected with primary current mutual inductor (28) with the 7th microcontactor (17) respectively by circuit after described the first microcontactor (11), the second microcontactor (12), the 3rd microcontactor (13), the 4th microcontactor (14), the 5th microcontactor (15), the 6th microcontactor (16) parallel connection; The 7th described tap (7) is connected with primary current mutual inductor (28) with the 7th microcontactor (17) respectively by circuit; Described Secondary Winding (36) is connected to the 8th tap (8) and the 9th tap (9); Power termination resistance R1 is connected with between the 8th described tap (8) and the 9th tap (9).
3. a kind of adjustable current transducer with high accuracy according to claim 1 and 2, is characterized in that described the first microcontactor (11), the second microcontactor (12), the 3rd microcontactor (13), the 4th microcontactor (14), the 5th microcontactor (15), the 6th microcontactor (16) adopt 3 pole main contacts microcontactors; Every 1 pole of 3 pole main contactss of described microcontactor is connected with one in three-phase alternating current respectively.
4. a kind of adjustable current transducer with high accuracy according to claim 1 and 2, is characterized in that described secondary current mutual inductor (29) adopts overall resin seal.
5. a kind of adjustable current transducer with high accuracy according to claim 1 and 2, is characterized in that described no-load voltage ratio switching control part (20) comprises 8 and drives I/O module, microcontactor, selector switch (10) and the universal seclector (31) outputed into 8; Wherein said selector switch (10) comprises manual contact (101) and automated contact (102); Described the first microcontactor (11) comprise the first microcontactor pull-in winding (113), the first microcontactor often drives auxiliary contact (111) and the 8th microcontactor often drives auxiliary contact (112); Described the second microcontactor (12) comprise the second microcontactor pull-in winding (123), the second microcontactor often drives auxiliary contact (121) and the 9th microcontactor often drives auxiliary contact (122); The 3rd described microcontactor (13) comprise the 3rd microcontactor pull-in winding (133), the 3rd microcontactor often drives auxiliary contact (131) and the tenth microcontactor often drives auxiliary contact (132); The 4th described microcontactor (14) comprise the 4th microcontactor pull-in winding (143), the 4th microcontactor often drives auxiliary contact (141) and the 11 microcontactor often drives auxiliary contact (142); The 5th described microcontactor (15) comprise the 5th microcontactor pull-in winding (153), the 5th microcontactor often drives auxiliary contact (151) and the 12 microcontactor often drives auxiliary contact (152); The 6th described microcontactor (16) comprise the 6th microcontactor pull-in winding (163), the 6th microcontactor often drives auxiliary contact (161) and the 13 microcontactor often drives auxiliary contact (162); The 7th described microcontactor (17) comprises pull-in winding (173) and the 7th microcontactor normally closed auxiliary contact (171) of the 7th microcontactor; The first described microcontactor often drives auxiliary contact (111), the second microcontactor often drives auxiliary contact (121), the 3rd microcontactor often drives auxiliary contact (131), the 4th microcontactor often drives auxiliary contact (141), the 5th microcontactor often drives auxiliary contact (151), the 6th microcontactor often drives auxiliary contact (161) by after lines in parallel, connect external power source after one end is in parallel with selector switch (10), the pull-in winding (173) of the other end and the 7th microcontactor is connected in series; Described 8 open the I/O module outputed into 8 comprises first and outputs (21), second and output (22), the 3rd and output (23), the 4th and output (24), the 5th and output (25), the 6th and output (26), the 7th and output (27); Described first outputs (21) is connected with the pull-in winding (113) of the first microcontactor by circuit; Described second outputs (22) is connected with the pull-in winding (123) of the second microcontactor by circuit; Described the 3rd outputs (23) is connected with the pull-in winding (133) of the 3rd microcontactor by circuit; Described the 4th outputs (24) is connected with the pull-in winding (143) of the 4th microcontactor by circuit; Described the 5th outputs (25) is connected with the pull-in winding (153) of the 5th microcontactor by circuit; Described the 6th outputs (26) is connected with the pull-in winding (163) of the 6th microcontactor by circuit; And described first outputs (21), second and outputs (22), the 3rd and output (23), the 4th and output (24), the 5th and output (25), the 6th and output (26) by being connected with the 7th microcontactor normally closed auxiliary contact (171) after lines in parallel 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); 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) are by being connected with manual contact (101) after lines in parallel again; The first described universal seclector contact (311) is connected with the pull-in winding (113) of the first microcontactor by circuit; The second described universal seclector contact (312) is connected with the pull-in winding (123) of the second microcontactor by circuit; The 3rd described universal seclector contact (313) is connected with the pull-in winding (133) of the 3rd microcontactor by circuit; The 4th described universal seclector contact (314) is connected with the pull-in winding (143) of the 4th microcontactor by circuit; The 5th described universal seclector contact (315) is connected with the pull-in winding (153) of the 5th microcontactor by circuit; The 6th described universal seclector contact (316) is connected with the pull-in winding (163) of the 6th microcontactor by circuit; The pull-in winding (113) of the first described microcontactor is often driven auxiliary contact (112) by circuit and the 8th microcontactor and is connected; The pull-in winding (123) of the second described microcontactor is often driven auxiliary contact (122) by circuit and the 9th microcontactor and is connected; The pull-in winding (133) of the 3rd described microcontactor is often driven auxiliary contact (132) by circuit and the tenth microcontactor and is connected; The pull-in winding (143) of the 4th described microcontactor is often driven auxiliary contact (142) by circuit and the 11 microcontactor and is connected; The pull-in winding (153) of the 5th described microcontactor is often driven auxiliary contact (152) by circuit and the 12 microcontactor and is connected; The pull-in winding (163) of the 6th described microcontactor is often driven auxiliary contact (162) by circuit and the 13 microcontactor and is connected; The 8th described microcontactor often drives auxiliary contact (112), the 9th microcontactor often drives auxiliary contact (122), the tenth microcontactor often drives auxiliary contact (132), the 11 microcontactor often drives auxiliary contact (142), the 12 microcontactor often drives auxiliary contact (152); 13 microcontactor is often driven auxiliary contact (162) and is connected by outputing (27) after lines in parallel again with the 7th; The 7th described microcontactor normally closed auxiliary contact (171) outputs (27) by being connected with automated contact (102) after lines in parallel again with the 7th; Line-to-ground is passed through after pull-in winding (173) parallel connection of the pull-in winding (153) of the pull-in winding (133) of the pull-in winding (113) of the first described microcontactor, the pull-in winding (123) of the 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310079791.7A CN103163347B (en) | 2013-03-13 | 2013-03-13 | Adjustable current transducer with high accuracy |
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| CN201310079791.7A CN103163347B (en) | 2013-03-13 | 2013-03-13 | Adjustable current transducer with high accuracy |
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| CN103163347B true CN103163347B (en) | 2015-04-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2503492Y (en) * | 2001-10-26 | 2002-07-31 | 山东电力研究院 | Current transmitter |
| CN2541848Y (en) * | 2002-04-17 | 2003-03-26 | 张敏 | Kilowatt-meter |
| CN1180527C (en) * | 2003-04-17 | 2004-12-15 | 大连理工大学 | Power supply source for photoelectricity type current transformer |
| CN101581737A (en) * | 2008-05-13 | 2009-11-18 | 邹长江 | Microwave current transducer |
| US8600695B2 (en) * | 2009-12-31 | 2013-12-03 | Veris Industries, Llc | Phase canceling current transducer |
| CN202770874U (en) * | 2012-09-04 | 2013-03-06 | 丹东电力设备厂 | High-voltage dry-type composite transformation ratio automatic conversion metering box |
| CN203191429U (en) * | 2013-03-13 | 2013-09-11 | 绍兴电力局 | High-precision adjustable current transmitter |
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