CN103187162B - Combination transformer for power system - Google Patents

Combination transformer for power system Download PDF

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Publication number
CN103187162B
CN103187162B CN201110459041.3A CN201110459041A CN103187162B CN 103187162 B CN103187162 B CN 103187162B CN 201110459041 A CN201110459041 A CN 201110459041A CN 103187162 B CN103187162 B CN 103187162B
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signal
module
transformer
voltage
input
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CN103187162A (en
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林芳敏
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Legend electric (Shenyang) Limited
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Shanghai Mwb Transformer Co ltd
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Priority to CN201110459041.3A priority Critical patent/CN103187162B/en
Priority claimed from PCT/EP2012/076566 external-priority patent/WO2013098226A1/en
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Abstract

The invention provides a kind of combination transformer for power system, including a housing (10), a base (20) and an insulator (30).Being provided with a current transformer (12) in housing, current transformer can detect the electric current in the Primary Conductor (40) of power system.Insulator is provided with a voltage transformer (32), it includes resistor voltage divider circuit (34), capacitance partial pressure circuit (36), second divided voltage resistance (37) and output branch road (38), wherein one end of resistor voltage divider circuit is electrically connected to Primary Conductor, and its other end is electrically connected to the second divided voltage potential point of capacitance partial pressure circuit;Capacitance partial pressure circuit is realized by multi-layer capacity screen.The combination transformer of the present invention need not install at the scene after calibration error and can plug and play.

Description

Combination transformer for power system
Technical field
The present invention relates to a kind of combination transformer for power system, particularly relate to a kind of independent electrical minor combination transformer.
Background technology
Power system needs use transformer high-voltage great-current and high voltage to be measured, to realize the guarantor of power system Protect, control and electric energy metrical.Also need in the process a sub-high pressure and secondary low-voltage are carried out electrical isolation.Combination mutual inductance Device is that one is provided simultaneously with electric current and voltage measurement function and a sub-high pressure and secondary low-voltage can be carried out electrical isolation simultaneously Equipment.
In traditional combination transformer, the measurement of electric current and voltage all uses band based on faraday electromagnetic induction principle unshakable in one's determination Electromagnetic transformer technology.Current this combination transformer is widely used in global power system.Due to therein Voltage transformer uses electromagnetic type, therefore unshakable in one's determination and a winding composition inductance element under certain operating conditions may be with electrical network On capacity cell (such as chopper, capacitor etc.) form ferromagnetic resonance, thus affect the stable operation of electrical network.Secondly, On the secondary side voltage transformer can not short circuit and current transformer can not be opened a way, otherwise after short circuit formed big electric current or open circuit Transformer will be caused very macrolesion by the overvoltage of rear formation.Additionally, the output interface of tradition transformer is applicable to electromechanical relay Device, and the output of single coil is the biggest, and then the core cross section that transformer is used is long-pending big, loss is big, increases Add the volume of transformer.
For high-pressure side active type electronic combined mutual inductor, current measurement part is positioned at the high-pressure side on transformer top, once Electric current passes from current transformer center through primary conductive bar, the most typically use air core coil as protected level transformer, And use low-power coil as measure level transformer, and the secondary of current transformer output be converted into digital optical signal after It is sent to low-pressure side through optical fiber.Voltage measuring section is normally in insulator, many employing electric pole type capacitive dividers.This The less stable of combination transformer, current measurement errors is directly by high side power voltage and each electronic device duty Impact, and owing to voltage measurement uses capacitive divider principle, output error is calibrated after needing to install at the scene, Therefore plug and play can not be accomplished.In power system, the projected life of transformer typically requires to reach 30 years, and high-pressure side is active Typically only 4 to the 5 years life-span of the electronic device of type electronic combined mutual inductor, and almost cannot normal service and can only be Just can change or repair after power failure, but the stable operation of electrical network can be made a big impact by improper power failure.Secondly, high The anti-electromagnetic interference capability of pressure side active type electronic combined mutual inductor is poor, and power transmission network is formed because of operations such as disconnecting switch Overvoltage may cause high side power or the deadlock of electronic module or the most breakdown.Again, the electric current of current transformer Defencive function uses air core coil, needs to be realized the linear relationship of secondary output voltage and primary current by quadratic integral, But no matter using the integrator of which kind of form, output waveform all can be caused certain distortion by the time constant of its integrator, special Not being in the case of time constant of integrator is big not, when once by short circuit current, the hangover of Luo-coil output is existing As very serious, result even in protection exception action, affect electric power netting safe running.
For the pure photoelectricity minor combination transformer that high-pressure side is passive, current measurement part is positioned at the high-pressure side on transformer top, Use all-fiber formula based on Faraday magnetooptical effect or magneto-optic glass formula sensing ring.The shortcoming of this combination transformer is mutual inductance Device cost is higher, requires material (the particularly polarization maintaining optical fibre of current transformer and the piezoquartz of voltage transformer) very Height, is the several times even tens times of tradition transformer.The optical fiber sensing ring of current measurement part and the crystal of voltage measuring section The electric field-sensitive that the magnetic field not only formed primary current and primary voltage are formed, is also the sensing element of pressure, temperature etc. simultaneously Part, all may cause directly impact in the operating vibration of transformer and variations in temperature etc. to error.Additionally, secondary letter Number treatment loop complicated, output signal is all with white noise, when without primary current, because of the interference of white noise, this combination Transformer also can export secondary singal, it is impossible to meets charging needs.If voltage measurement have employed capacitive divider and bubble gram ear The technology that this (pockels) effect combines, the then measurement error of voltage segment also necessary field calibration, it is impossible to accomplish i.e. to insert I.e. use.
Therefore, this area needs a kind of combination transformer that the cost for power system is reasonable, reliability is high and easy for installation.
Summary of the invention
It is an object of the invention to provide a kind of combination transformer, it is to avoid use existing combination transformer error school after mounting Standard, and cost is reasonable, reliability is high, length in service life and can plug and play.
This combination transformer for power system that the present invention provides, including a housing, a base and a connection Described housing and the insulator of described base.Being provided with a current transformer in described housing, described current transformer can detect Electric current in the Primary Conductor of described power system, and described current transformer will reflect the of current value in described Primary Conductor One signal sends to described base.Being provided with a voltage transformer in described insulator, described voltage transformer includes: one Output branch road, including a first input end and second input, wherein said output branch road is once led described in reflection In body, the secondary signal of magnitude of voltage sends to described base;One resistor voltage divider circuit, its one end be electrically connected to described in once lead Body, and its other end is electrically connected to described first input end;The capacitance partial pressure circuit that one is in series by multi-layer capacity screen, Its one end is electrically connected to described Primary Conductor, and its other end is electrically connected to described second input, and described first input end electricity It is connected to the second divided voltage potential point of described capacitance partial pressure circuit;And a second divided voltage resistance, its one end is electrically connected to institute State first input end, and its other end is electrically connected to described second input.Owing to present invention uses series resistance and series connection The dividing potential drop mode formed after electric capacity parallel connection and multi-layer capacity screen, widened combination transformer and can accurately measure in Primary Conductor The frequency domain of magnitude of voltage, and the error of calibration voltage transformer after need not install at the scene, i.e. accomplished combination transformer Plug and play.Additionally, this combination transformer cannot be only used for the measurement of alternating voltage, it is also possible to for the survey of DC voltage Amount.
In a kind of exemplary embodiment of combination transformer of the present invention, the electrode of each layer capacitance screen in described multi-layer capacity screen Bearing of trend consistent with the bearing of trend of described insulator, such that it is able to be arranged as required to the electric capacity that electrode area is sufficiently large Shield and simplify the processing assembling of multi-layer capacity screen.
In another exemplary embodiment of combination transformer of the present invention, described combination transformer include a high pressure flange and One ground connection flange, wherein said insulator is connected with described housing by described high pressure flange, and described insulator passes through institute State ground connection flange to be connected with described base.
In another exemplary embodiment of combination transformer of the present invention, described combination transformer includes a fairlead, one Described secondary signal is transferred to institute by the individual electric current double shielded twisted pair line that described first signal is transferred to described base and one State the voltage double shielded twisted pair line of base, wherein said electric current double shielded twisted pair line and described voltage double shielded twisted pair line to be arranged in In described fairlead.Fairlead can protect the double shielded twisted pair line that inside wears.
In the another exemplary embodiment of combination transformer of the present invention, described capacitance plate be wound on described fairlead or Being assembled to after molding in advance on described fairlead, the electrode of described capacitance plate uses aluminium foil, Copper Foil, thin film semiconductor or papery One in quasiconductor, and described interelectrode insulating barrier be sulfur hexafluoride gas laminated film, insulating oil composite cable paper, Epoxy resin is combined the one in crimped paper or silicone oil ptfe composite band.
In the another exemplary embodiment of combination transformer of the present invention, described second input of described output branch road is electrically connected It is connected to earth potential.
In the another exemplary embodiment of combination transformer of the present invention, described resistor voltage divider circuit includes a plurality of thick film electricity Resistance, described thick-film resistor is parallel to the two ends of described capacitance plate after being connected in series, the described thick-film resistor after being connected in series One end is electrically connected to described Primary Conductor, and its other end is electrically connected to the described first input end of described output branch road.
In the another exemplary embodiment of combination transformer of the present invention, described resistor voltage divider circuit includes a resistor, Described resistor by by resistive slurry with laser printing or spraying by the way of Attachments in the inner side table of described insulator Face is formed, and one end of described resistor is electrically connected to described high pressure flange, and its other end is electrically connected to the institute of described output branch road State first input end.Using insulator as a part for voltage transformer, i.e. ensure that the insulation system of combination transformer, material The long life of material, reliability and stability, saved the material of voltage transformer simultaneously so that design cost reduces.
In the another exemplary embodiment of combination transformer of the present invention, described current transformer is low-power electronic current Transformer, it includes a magnetic core, the Secondary Winding that is wound on described magnetic core and one are connected to described Secondary Winding end Shunt resistance.
In the another exemplary embodiment of combination transformer of the present invention, filling between described current transformer and described housing Have dielectric, described dielectric be sulfur hexafluoride gas, insulating oil composite cable paper, epoxy resin be combined crimped paper or One in silicone oil ptfe composite band.
In the another exemplary embodiment of combination transformer of the present invention, described base is provided with an outlet box, described in go out Line box includes: an input module, and described first signal obtains secondary the first signal after described input module voltage division processing, Described secondary signal obtains secondary secondary signal after described input module voltage division processing;One with described input module electrically every From sampling module, described secondary the first signal and described secondary secondary signal can be sampled by described sampling module, and by them Be converted to reflect described first signal and the first digital signal of described secondary signal and the second digital signal respectively;One conversion Module, described modular converter receives described first digital signal of described sampling module output and described second digital signal, and Both digital quantities are incorporated in a message by communication protocol or communication protocol;One output module, described output module Receive the described message of described modular converter output, and outwards export described message by the network mouth of optical fiber or cable;One Individual power module, described power module is to described input module, described sampling module, described modular converter and described output mould Block provides the electric energy needed for they work.In combination transformer, input module, sampling module and modular converter are all located at low In the base of pressure side, it is favorably improved anti-electromagnetic interference capability and the reliability of combination transformer, and maintenance is convenient, it is not necessary to Once have a power failure and can overhaul or change module.
In another schematic embodiment of the combination transformer of power system, described base is provided with an outlet Box, described outlet box includes: an input module, and described first signal obtains secondary after described input module voltage division processing First signal, described secondary signal obtains secondary secondary signal after described input module voltage division processing;One and described input The sampling module of modular electrical isolation, described secondary the first signal and described secondary secondary signal can be adopted by described sampling module Sample, and convert them to reflect described first signal and the first digital signal of described secondary signal and the second numeral letter respectively Number;One output module, described output module receives described first digital signal and described second of described sampling module output Digital signal, and outwards export described first digital signal and described second numeral letter by the network mouth of optical fiber or cable Number;One power module, described power module provides it to described input module, described sampling module and described output module The required electric energy that works.In combination transformer, input module and sampling module are all located in the base of low-pressure side, help In improving the anti-electromagnetic interference capability of combination transformer and reliability, and maintenance is convenient, it is not necessary to once have a power failure can overhaul or Change module.
In another schematic embodiment of the combination transformer of power system, described outlet box also includes: one same Step module, described synchronization module receives from the synchronizing signal outside described combination transformer, and according to described synchronizing signal control Make described sampling module to synchronize.
Hereafter by the way of the most understandable, accompanying drawings preferred embodiment, and above-mentioned to combination transformer of the present invention Characteristic, technical characteristic, advantage and implementation thereof are further described.
Accompanying drawing explanation
The present invention is only schematically illustrated and explains by the following drawings, not delimit the scope of the invention.
Fig. 1 is the structural representation of a kind of exemplary embodiment of the combination transformer for power system.
Fig. 2 shows for the circuit structure of a kind of exemplary embodiment of the voltage transformer of combination transformer shown in explanatory diagram 1 It is intended to.
Fig. 3 shows the partial structurtes signal of a kind of exemplary embodiment of capacitance plate in the combination transformer of power system Figure.
Fig. 4 is for illustrating the structural representation of a kind of exemplary embodiment of the base of the combination transformer of power system.
Label declaration
10 housings
11 dielectrics
12 current transformers
20 bases
22 outlet boxes
24 input modules
25 modular converters
26 sampling modules
27 synchronization modules
28 output modules
29 power modules
30 insulators
31 high pressure flanges
32 voltage transformers
33 ground connection flanges
34 resistor voltage divider circuits
35 fairleads
352 electric current double shielded twisted pair lines
354 voltage double shielded twisted pair lines
36 capacitance partial pressure circuit
361 second divided voltage potential points
362 electrodes
37 second divided voltage resistance
38 output branch roads
382 first input ends
384 second inputs
40 Primary Conductor
Detailed description of the invention
In order to technical characteristic, purpose and the effect of invention are more clearly understood from, the now tool of the comparison accompanying drawing explanation present invention Body embodiment, the most identical label represents identical or structure is similar but part that function is identical.
For making simplified form, only schematically show part related to the present invention in each figure, they do not represent it and make Practical structures for product.It addition, so that simplified form readily appreciates, some figure has the portion of identical structure or function Part, only symbolically depicts one of them, or has only marked one of them.
In this article, " one " not only represents " only this ", it is also possible to represent the situation of " more than one ".Herein, It is absolute parallel that " parallel " between two objects does not represent on geometric meaning, but can comprise assembling and add and permitted man-hour The deviation permitted.
In this article, earth potential, base 20, ground connection flange 33 and the second input 384 are electrically coupleable to the earth, they There is identical current potential.Housing 10, Primary Conductor 40 and high pressure flange 31 have identical current potential.
Fig. 1 shows the structural representation of a kind of exemplary embodiment of the combination transformer for power system.Such as Fig. 1 Shown in, the combination transformer of the present invention includes 10, base 20 of a housing and an insulator 30.Wherein, housing Connected by insulator 30 between 10 and base 20.In a kind of embodiment of combination transformer of the present invention, insulator 30 include insulator.One end that insulator 30 is connected with housing 10 is provided with high pressure flange 31, and the one end being connected with base 20 Be provided with ground connection flange 33, wherein connecting bolt (not shown) respectively by high pressure flange 31 and ground connection flange 33 by absolutely Edge 30 is connected with housing 10 and base 20.Insulator 30 can also complete and housing 10 by the way of watering and filling or be bonding Connection with base 20.
Housing 10 is provided with a current transformer 12.Current transformer 12 can detect in the Primary Conductor 40 of power system Electric current.Primary Conductor 40 is connected with the supply line in power system, its current potential and flow through its electric current and supply lines Road is identical.First signal of current value in reflection Primary Conductor 40 is sent to base 20 by current transformer 12.In the present invention In a kind of exemplary embodiment of combination transformer, current transformer is disclosed in Chinese patent ZL200510024292.3 Low-power electronic current mutual inductor, it includes a magnetic core, a Secondary Winding and a shunt resistance.Secondary Winding Wire is wound on magnetic core equably, and the end of Secondary Winding is connected to shunt resistance, the reflection Primary Conductor that it senses First signal of middle current value sends to base through the transmission of double shielded twisted pair line.The concrete structure of current transformer can be found in this Patent of invention description, does not repeats them here.Current transformer can be to use the electricity of other form, such as magneto-optic effect Current transformer.
It addition, current transformer there to be following several structure and can use corresponding mode to measure: i) independent by two Coil is constituted, and each coil at least possesses an independent output, and one of them coil is for measuring the electric current in power system Value, another coil is for there is trigger protection action during overcurrent in power system;Ii) in same low-power line Only one output of design in enclosing, not only meets measurement but also meet protection under this output electric current in different Primary Conductor Required precision, such as, when the electric current in Primary Conductor is less than or equal to 200% specified Primary Conductor electric current, coil output meets Measure level error requirements, and when primary current is between 200% specified Primary Conductor electric current to system short-circuit electric current, secondary Output meets protected level error requirements;Iii) designing two-way output in same low-power coil, wherein a road output meets Measuring level error requirements, another road meets protected level error requirements.
Be filled with dielectric 11 between current transformer 12 and housing 10, dielectric 11 can be sulfur hexafluoride gas, Insulating oil composite cable paper, epoxy resin are combined the one in crimped paper or silicone oil ptfe composite band.
Insulator 30 is provided with a voltage transformer 32.Fig. 2 is for the mutual induction of voltage of combination transformer shown in explanatory diagram 1 A kind of electrical block diagram of the exemplary embodiment of device 32.As it can be seen, voltage transformer 32 includes a resistance Bleeder circuit 36, output branch road 38 of 34, capacitance partial pressure circuit and second divided voltage resistance 37, wherein an electric capacity Bleeder circuit 36 is in series by multi-layer capacity screen.Output branch road 38 include a first input end 382 and one second defeated Enter end 384.The secondary signal of magnitude of voltage in reflection Primary Conductor 40 can be sent to base 20 by output branch road 38.Resistance divides Volt circuit 34 is parallel to capacitance partial pressure circuit 36, i.e. one end of resistor voltage divider circuit 34 and is electrically connected to Primary Conductor 40, from And with Primary Conductor 40, there is identical current potential, and the other end of resistor voltage divider circuit 34 is electrically connected to first input end 382. One end of capacitance partial pressure circuit 36 is electrically connected to Primary Conductor 40, and its other end is electrically connected to the second input 384, and First input end 382 is electrically connected to the second divided voltage potential point 361 of capacitance partial pressure circuit 36.The one of second divided voltage resistance 37 End is electrically connected to first input end 382, and its other end is electrically connected to the second input 384.Schematic enforcement in diagram In mode, the second input 384 ground connection.
Due to the dividing potential drop mode formed after employing series resistance and series capacitance parallel connection, thus widen this combination transformer energy In enough Primary Conductor accurately measured, the frequency domain of magnitude of voltage, specifically avoid the loss of high-frequency voltage signal.Meanwhile, phase Increase a lot and interelectrode than the electrode area of each layer capacitance in traditional electrode formula capacitive divider, multi-layer capacity screen It is the thinnest that the thickness of insulating barrier can do, thus substantially increases the capacitance of capacitance plate.Additionally, the parasitic electricity of capacitance plate Hold little, be not easily susceptible to the interference of extraneous stray capacitance, the error of calibration voltage transformer after therefore need not install at the scene, I.e. accomplish the plug and play of combination transformer.Meanwhile, this combination transformer cannot be only used for the measurement of alternating voltage, also may be used Measurement for DC voltage.
Fig. 3 shows the partial structurtes signal of a kind of exemplary embodiment of capacitance plate in the combination transformer of power system Figure.As it can be seen, the bearing of trend of the bearing of trend of the electrode 362 of every layer capacitance screen and insulator 30 in multi-layer capacity screen Unanimously.By this set method, the capacitance plate that electrode area is sufficiently large can be arranged as required to, it is to avoid between electrode Thickness of insulating layer is too small.Additionally, the bearing of trend of electrode 362 can also be certain folder with the bearing of trend of insulator 30 Angle.
Seeing Fig. 1 and Fig. 3, insulator 30 is additionally provided with a fairlead 35, for the first signal is transferred to base 20 Electric current double shielded twisted pair line 352 and being arranged in for secondary signal being transferred to the voltage double shielded twisted pair line 354 of base 20 In fairlead 35, use double shielded twisted pair line can reduce the external electromagnetic field interference to transmitted signal, it is also possible to adopt Having the transmission means of function of shielding with other, fairlead 35 can protect the double shielded twisted pair line that inside wears.
Seeing Fig. 2 and Fig. 3, capacitance plate is wound on fairlead 35 or is assembled on fairlead after molding in advance, each layer electricity It is connected in series by public electrode between appearance.Wherein, the electrode of capacitance plate can be aluminium foil, Copper Foil, thin film semiconductor or Papery quasiconductor etc. has the specific fexible film of conduction.Insulating barrier between electrode can be sulfur hexafluoride laminated film, absolutely Edge oil composite cable paper, epoxy resin are combined the flexible dielectric films such as crimped paper or silicone oil ptfe composite band.Capacitance plate Outermost layer electrode be electrically connected to Primary Conductor 40, the last layer electrode of capacitance plate is electrically connected to earth potential.Output branch road 38 The second input 384 be electrically connected to the last layer electrode of capacitance plate, its first input end 382 is electrically connected to capacitance partial pressure electricity Corresponding to the tap of electrode at second divided voltage potential point 361 in road 36, i.e. gather this second divided voltage potential point 361 and ground electricity Potential difference between Wei is as voltage output signal, thus exports the secondary signal of magnitude of voltage in reflection Primary Conductor, and wherein two Secondary partial pressure potential point refers to the current potential potential point corresponding to intrinsic standoff ratio that to be Primary Conductor current potential specified by standard.Art technology Personnel are connected to the resistance value of resistor voltage divider circuit 34, to be closed it will be appreciated that output branch road 38 can be adjusted as required Suitable current potential.
Seeing Fig. 2 and Fig. 3, resistor voltage divider circuit 34 includes multiple thick-film resistor, after these thick-film resistors are connected in series, and one End is connected to the outermost layer electrode of capacitance plate, and the other end is connected to the second divided voltage potential point 361 of capacitance plate so that resistance divides Volt circuit 34 is connected to capacitance partial pressure circuit 36, and wherein one end of thick-film resistor is electrically connected to Primary Conductor 40, its other end It is electrically connected to export the first input end 382 of branch road 38.By the way of laser printing or spraying, resistive can also be starched Material Attachments on the inner surface of insulator, the resistor of forming curves form.One end of resistor is electrically connected to high pressure Flange, its other end electrically connects with the first input end 382 of output branch road 38, and insulate with ground connection flange 33.Will insulation Son 30, simultaneously as a part for voltage transformer, i.e. ensure that the insulation system of combination transformer, the long of material use the longevity Life, reliability and stability, saved the material of voltage transformer simultaneously so that design cost reduces.
Fig. 4 is for illustrating the structural representation of a kind of exemplary embodiment of the base 20 of combination transformer of the present invention.As Shown in figure, being provided with an outlet box 22 in base 20 (not shown), it includes that an input module 24, is adopted 26, modular converter of original mold block, 28, synchronization module 27 of 25, output module and a power module 29.
Wherein, input module 24 can receive respectively by voltage double shielded twisted pair line 354 and the electric current double shield of output branch road 38 First signal of current value and in reflection Primary Conductor the second of magnitude of voltage in the reflection Primary Conductor 40 of twisted-pair feeder 352 input Signal, and the first signal and secondary signal are carried out voltage division processing to reduce their electromotive force further, after voltage division processing respectively Obtain secondary the first signal and secondary secondary signal.
Secondary the first signal and secondary secondary signal are sampled by the way of isolation coupling by sampling module 26, such as, pass through magnetic The mode of electric coupling or photoelectric coupling inputs secondary the first signal and secondary secondary signal.Sampling module 26 and input module 24 Between electrical isolation in order to ensure the maintenance safety of outlet box 22 and to avoid high pressure that device in outlet box 22 is impacted. Meanwhile, secondary the first signal and the secondary secondary signal of analog form are also converted to the first of digital form by sampling module 26 Digital signal and the second digital signal.
Modular converter 25 receives the first digital signal and the second digital signal, and according to the industry standard of power system, such as IEC61850-9-1/2 or IEC60044-1 (FT3), carries out resampling and lattice to the first digital signal and the second digital signal The standardization of formula conversion, obtains meeting the formatting signal of communication protocol/agreement, and by the first digital signal and the second number Word signal both digital quantities are incorporated in a message according to communication protocol or communication protocol.Can be according to the tool of power system The situation of body is selected or is not selected modular converter 25.
Output module 28 is able to receive that formatting signal or directly receives digital signal, and output module 28 will format signal Or digital signal is converted to be suitable for Ethernet or the signal of point-to-point transmission, and the network mouth by optical fiber or cable is the most defeated Go out.
As shown in Figure 4, outlet box 22 also includes a synchronization module 27.It can receive from combination mutually according to IEC61588 Synchronizing signal outside sensor, and synchronize according to synchronizing signal control sampling module 26, with each in collaborative power system The measurement action of individual combination transformer and test terminal.After losing outer synchronous signal, outlet box 22 automatically switches, and makes Obtain input module 24, sampling module 26, modular converter 25 and output module 28 continuous firing in outlet box 22, it is ensured that Sampling work is the most uninterrupted.
Power module 29 can be to input module 24, sampling module 26, modular converter 25, output module 28 and synchronization module 27 provide the electric energy needed for they work.Direct current ± 110V or alternating current 220V that outside can be accessed by power module 29 turn Change into and be available for sampling module 26, input module 24 and the low-voltage DC of modular converter 25 work, it is possible to use battery to power Mode power.
The combination transformer of power system, high-pressure side housing 10 is passive structures, be not provided with in housing 10 taking can, sampling and Modular converter, input module 24, sampling module 26 and modular converter 25 are all located in the base 20 of low-pressure side, contribute to Improve the anti-electromagnetic interference capability of combination transformer, reliability, and maintenance is convenient, it is not necessary to once have a power failure and can overhaul or more Die change block.
In this article, " schematically " expression " serves as example, example or explanation ", should will not be described herein as " schematically " Any diagram, embodiment be construed to a kind of preferred or more advantage technical scheme.
It is to be understood that, although this specification describes according to each embodiment, but the most each embodiment only comprises one solely Vertical technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should be by description As an entirety, the technical scheme in each embodiment can also be through appropriately combined, and formation it will be appreciated by those skilled in the art that Other embodiments.
The a series of detailed description of those listed above is only for illustrating of the possible embodiments of the present invention, they And be not used to limit the scope of the invention, all Equivalent embodiments or changes made without departing from skill of the present invention spirit all should Within being included in protection scope of the present invention.

Claims (12)

1., for the combination transformer of power system, connect institute including a housing (10), a base (20) and one State the insulator (30) of housing (10) and described base (20), and a high pressure flange (31) and a ground connection method Blue (33), wherein said insulator (30) is connected with described housing (10) by described high pressure flange (31), and institute State insulator (30) to be connected with described base (20) by described ground connection flange (33);
Being provided with a current transformer (12) in described housing (10), described current transformer (12) can detect described electricity Electric current in the Primary Conductor (40) of Force system, and described current transformer (12) will reflect described Primary Conductor (40) First signal of middle current value sends to described base (20);
Described insulator (30) is provided with a voltage transformer (32), it is characterised in that described voltage transformer (32) Including:
One output branch road (38), including a first input end (382) and second input (384), Qi Zhongsuo State output branch road (38) and will reflect that the secondary signal of magnitude of voltage in described Primary Conductor (40) sends to described base (20);
One resistor voltage divider circuit (34), its one end is electrically connected to described Primary Conductor (40), and its other end is electrically connected to Described first input end (382), described resistor voltage divider circuit (34) includes a resistor, and described resistor is by by electricity Resistive slurry Attachments in the way of laser printing or spraying is formed in the inner surface of described insulator (30), described electricity One end of stopband is electrically connected to described high pressure flange (31), and its other end is electrically connected to the described of described output branch road (38) First input end (382);
The capacitance partial pressure circuit (36) that one is in series by multi-layer capacity screen, its one end is electrically connected to described Primary Conductor (40), its other end is electrically connected to described second input (384), and described first input end (382) is electrically connected to institute State the second divided voltage potential point (361) of capacitance partial pressure circuit (36);And
One second divided voltage resistance (37), its one end is electrically connected to described first input end (382), and its other end is electrically connected It is connected to described second input (384).
2. combination transformer as claimed in claim 1, the electrode (362) of each layer capacitance screen in wherein said multi-layer capacity screen Bearing of trend consistent with the bearing of trend of described insulator (30).
3. combination transformer as claimed in claim 1, wherein said combination transformer includes a fairlead (35), one Individual electric current double shielded twisted pair line (352) that described first signal is transferred to described base (20) and one are by described second Signal is transferred to voltage double shielded twisted pair line (354) of described base (20), wherein said electric current double shielded twisted pair line (352) It is arranged in described fairlead (35) with described voltage double shielded twisted pair line (354).
4. combination transformer as claimed in claim 3, wherein said capacitance plate be wound in described fairlead (35) upper or Be assembled to after person's molding in advance on described fairlead (35), the electrode (362) of described capacitance plate use aluminium foil, Copper Foil, One in thin film semiconductor or papery quasiconductor, and the insulating barrier between described electrode (362) be sulfur hexafluoride gas be combined Thin film, insulating oil composite cable paper, epoxy resin are combined the one in crimped paper or silicone oil ptfe composite band.
5. combination transformer as claimed in claim 1, described second input (384) of wherein said output branch road (38) It is electrically connected to earth potential.
6. combination transformer as claimed in claim 1, wherein said resistor voltage divider circuit (34) includes a plurality of thick film Resistance, described thick-film resistor is parallel to the two ends of described capacitance plate after being connected in series, the described thick-film resistor after being connected in series One end be electrically connected to described Primary Conductor (40), its other end is electrically connected to described the first of described output branch road (38) Input (382).
7. combination transformer as claimed in claim 1, wherein said current transformer (12) is low-power electronic electricity Current transformer, it includes a magnetic core, the Secondary Winding that is wound on described magnetic core and one are connected to described Secondary Winding end The shunt resistance of end.
8. combination transformer as claimed in claim 1, wherein said current transformer (12) and described housing (10) Between be filled with dielectric (11), described dielectric (11) is sulfur hexafluoride gas, insulating oil composite cable paper, ring Epoxy resins is combined the one in crimped paper or silicone oil ptfe composite band.
9. the combination transformer as according to any one of claim 1 to 8, wherein said base is provided with one in (20) Outlet box (22), described outlet box (22) including:
One input module (24), described first signal obtains secondary first after described input module (24) voltage division processing Signal, described secondary signal obtains secondary secondary signal after described input module (24) voltage division processing;
One with the sampling module (26) of described input module (24) electrical isolation, described sampling module (26) can be to institute State secondary the first signal and the sampling of described secondary secondary signal, and convert them to reflect respectively described first signal and described First digital signal of secondary signal and the second digital signal;
One modular converter (25), described modular converter (25) receives described first that described sampling module (26) exports Digital signal and described second digital signal, and both digital quantities are incorporated into a message by communication protocol or communication protocol In;
One output module (28), described output module (28) receives the described message that described modular converter (25) exports, And outwards export described message by the network mouth of optical fiber or cable;
One power module (29), described power module (29) to described input module (24), described sampling module (26), Described modular converter (25) and described output module (28) provide the electric energy needed for they work.
10. the combination transformer as according to any one of claim 1 to 8, wherein said base is provided with one in (20) Outlet box (22), described outlet box (22) including:
One input module (24), described first signal obtains secondary first after described input module (24) voltage division processing Signal, described secondary signal obtains secondary secondary signal after described input module (24) voltage division processing;
One with the sampling module (26) of described input module (24) electrical isolation, described sampling module (26) can be to institute State secondary the first signal and the sampling of described secondary secondary signal, and convert them to reflect respectively described first signal and described First digital signal of secondary signal and the second digital signal;
One output module (28), described output module (28) receives described first that described sampling module (26) exports Digital signal and described second digital signal, and outwards export described first digital signal by the network mouth of optical fiber or cable With described second digital signal;
One power module (29), described power module (29) is to described input module (24), described sampling module (26) The electric energy needed for they work is provided with described output module (28).
11. combination transformers as claimed in claim 9, wherein said outlet box (22) also includes:
One synchronization module (27), described synchronization module (27) receives from the synchronizing signal outside described combination transformer, And synchronize according to the described synchronizing signal described sampling module of control (26).
12. combination transformer as claimed in claim 10, wherein said outlet box (22) also includes:
One synchronization module (27), described synchronization module (27) receives from the synchronizing signal outside described combination transformer, And synchronize according to the described synchronizing signal described sampling module of control (26).
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CN201110459041.3A CN103187162B (en) 2011-12-31 2011-12-31 Combination transformer for power system
PCT/EP2012/076566 WO2013098226A1 (en) 2011-12-31 2012-12-21 Combined transformer for power system
EP12813352.7A EP2807664B1 (en) 2011-12-31 2012-12-21 Combined transformer for power system
ES12813352.7T ES2586827T3 (en) 2011-12-31 2012-12-21 Combined transformer for power system
HRP20160996TT HRP20160996T1 (en) 2011-12-31 2016-08-09 Combined transformer for power system

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EP3486662A1 (en) * 2017-11-20 2019-05-22 3M Innovative Properties Company Voltage divider assembly
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