CN202373447U - Combined transformer for power system - Google Patents
Combined transformer for power system Download PDFInfo
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- CN202373447U CN202373447U CN2011205714404U CN201120571440U CN202373447U CN 202373447 U CN202373447 U CN 202373447U CN 2011205714404 U CN2011205714404 U CN 2011205714404U CN 201120571440 U CN201120571440 U CN 201120571440U CN 202373447 U CN202373447 U CN 202373447U
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Abstract
The utility model provides a combined transformer for a power system. The combined transformer comprises a casing (10), a base (2) and an insulator (30). A current transformer (12) is arranged in the casing and can detect the current in a primary conductor (40) in the power system. A voltage transformer (32) is arranged in the insulator and comprises a resistance voltage division circuit (34), a capacitor voltage division circuit (36), a secondary divider resistance (37) and an output branch circuit (38), wherein one end of the resistance voltage division circuit is electrically connected with the primary conductor, and the other end of the resistance voltage division circuit is electrically connected with a secondary voltage division potential point of the capacitor voltage division circuit achieved by a plurality of capacitive touch screens. Plug and play of the combined transformer for the power system can be achieved without error calibration on the site after installation.
Description
Technical field
The utility model relates to a kind of combination transformer that is used for electric power system, relates in particular to a kind of independent electronic formula combination transformer.
Background technology
Need in the electric power system to adopt instrument transformer that high-voltage great-current and high voltage are measured, to realize protection, control and the electric energy metrical of electric power system.In this process, also need a sub-high pressure and secondary low-voltage be carried out electrical isolation.Combination transformer is a kind ofly to possess electric current and voltage measurement function simultaneously and can be simultaneously a sub-high pressure and secondary low-voltage be carried out the equipment of electrical isolation.
In traditional combination transformer, the measurement of electric current and voltage is all adopted based on the band of Faradic electricity magnetic induction principle electromagnetic transformer technology unshakable in one's determination.Present this combination transformer is widely used in the global electric power system.Because voltage transformer wherein adopts electromagnetic type,, thereby influence the stable operation of electrical network so the inductance element of unshakable in one's determination and a winding formation possibly form ferro resonance with the capacity cell (like circuit breaker, capacitor etc.) on the electrical network under certain service conditions.Secondly, voltage transformer can not short circuit and current transformer can not be opened a way on secondary side, otherwise the overvoltage that big electric current that forms after the short circuit or open circuit back form will cause very macrolesion to instrument transformer.In addition, the output interface of traditional instrument transformer is applicable to electromechanical relay, and the power output of single coil is bigger sometimes, and then the magnetic core sectional area that makes instrument transformer use is big, and loss is big, has increased the volume of instrument transformer.
For high-pressure side active type electronic combined mutual inductor; Current measurement partly is positioned at the high-pressure side on instrument transformer top; Primary current passes from the current transformer center through the primary conductive bar; Wherein generally adopt air core coil to use instrument transformer, and adopt the low-power coil to use instrument transformer, and the output of the secondary of current transformer is converted into digital optical signal after optical fiber sends to low-pressure side as measuring level as protected level.The voltage measurement part generally is arranged in insulator, adopts the electric pole type capacitor voltage divider more.The less stable of this combination transformer; Current measurement errors directly receives the influence of high-pressure side supply voltage and each electronic device operating state; And because voltage measurement adopts is the capacitor voltage divider principle, output error is calibrated after needing to install at the scene, so can not accomplish plug and play.Generally require to reach 30 years the designed life of instrument transformer in the electric power system; And the life-span of the electronic device of high-pressure side active type electronic combined mutual inductor generally has only 4 to 5 years; And almost can't normally overhaul and can only after power failure, just can change or repair, still improper power failure makes a big impact to the stable operation meeting of electrical network.Secondly, the anti-electromagnetic interference capability of high-pressure side active type electronic combined mutual inductor is relatively poor, and the overvoltage that forms because of operations such as isolating switches on the electric power transmission network possibly cause the deadlock of high-pressure side power supply or electronic module or directly breakdown.Once more; The current protecting function of current transformer adopts air core coil, need realize the linear relationship of secondary output voltage and primary current through quadratic integral, but no matter adopt the integrator of which kind of form; The time constant of its integrator all can cause certain distortion to output waveform; Particularly under the big inadequately situation of time constant of integrator, when the single pass short circuit current, the conditions of streaking of Luo-coil output is very serious; Even can cause the protection exception action, influence electric power netting safe running.
For the passive pure photoelectricity minor combination transformer in high-pressure side, current measurement partly is positioned at the high-pressure side on instrument transformer top, adopts full optical fiber type or magneto-optic glass formula sensing ring based on Faraday magnetooptical effect.The shortcoming of this combination transformer is that the instrument transformer cost is higher, material (the particularly piezoelectric crystal of the polarization maintaining optical fibre of current transformer and voltage transformer) is required very high, is several times even tens times of traditional instrument transformer.The crystal of the optical fiber sensing ring of current measurement part and voltage measurement part is not only to the magnetic field of primary current formation and the electric field-sensitive of primary voltage formation; Also be the sensing element of pressure, temperature etc. simultaneously, all may cause direct influence error in operating vibration of instrument transformer and variations in temperature etc.In addition, the treatment loop of secondary singal is complicated, and the output signal is all with white noise, and when no primary current, because of the interference of white noise, this combination transformer also can be exported secondary singal, can not satisfy the charging needs.If the technology that voltage measurement has adopted capacitor voltage divider to combine with Pockels (pockels) effect, then the also necessary field calibration of the measure error of voltage segment can not be accomplished plug and play.
Therefore, this area needs a kind of combination transformer that cost is reasonable, reliability is high and easy for installation that is used for electric power system.
The utility model content
The purpose of the utility model provides a kind of combination transformer, avoids the use of existing combination transformer calibrating for error after installation, but and cost is reasonable, reliability is high, long service life and plug and play.
This combination transformer that is used for electric power system that the utility model provides comprises a housing, base and an insulator that is connected said housing and said base.Be provided with a current transformer in the said housing, said current transformer can detect the electric current in the Primary Conductor of said electric power system, and said current transformer will reflect that first signal of current value is sent to said base in the said Primary Conductor.Be provided with a voltage transformer in the said insulator; Said voltage transformer comprises: an output branch road; Comprise a first input end and one second input, wherein said output branch road will reflect that the secondary signal of magnitude of voltage in the said Primary Conductor is sent to said base; A resistor voltage divider circuit, the one of which end is electrically connected on said Primary Conductor, and its other end is electrically connected on said first input end; A capacitance partial pressure circuit that is in series by the multi-layer capacity screen, the one of which end is electrically connected on said Primary Conductor, and its other end is electrically connected on said second input, and said first input end is electrically connected on the second divided voltage potential point of said capacitance partial pressure circuit; And a second divided voltage resistance, the one of which end is electrically connected on said first input end, and its other end is electrically connected on said second input.Because the utility model has used dividing potential drop mode and the multi-layer capacity screen of forming after series resistance and the series capacitance parallel connection; Widen combination transformer and can accurately measure the frequency domain scope of magnitude of voltage in the Primary Conductor; And do not need to install at the scene the error of back calibration voltage instrument transformer, the plug and play of promptly having accomplished combination transformer.In addition, this combination transformer not only can be used for the measurement of alternating voltage, can also be used for the measurement of direct voltage.
In a kind of exemplary embodiment of the combination transformer of the utility model; The bearing of trend of the electrode of each layer capacitance screen is consistent with the bearing of trend of said insulator in the said multi-layer capacity screen, thereby the enough big capacitance plate of electrode area can be set as required and simplify the processing assembling that multi-layer capacity shields.
In another exemplary embodiment of the combination transformer of the utility model; Said combination transformer comprises a high pressure flange and a ground connection flange; Wherein said insulator is connected with said housing through said high pressure flange, and said insulator is connected with said base through said ground connection flange.
In an exemplary embodiment again of the combination transformer of the utility model; Said combination transformer comprises a fairlead; Electric current double shield twisted-pair feeder and one who said first signal is passed to said base is passed to the voltage double shield twisted-pair feeder of said base with said secondary signal, and wherein said electric current double shield twisted-pair feeder and said voltage double shield twisted-pair feeder are arranged in the said fairlead.The double shield twisted-pair feeder that fairlead can protect inside to wear.
In the another exemplary embodiment of the combination transformer of the utility model; Said capacitance plate is wound on the said fairlead and perhaps is assembled on the said fairlead after the moulding in advance; A kind of in the electrodes use aluminium foil of said capacitance plate, Copper Foil, thin film semiconductor or the papery semiconductor, and said interelectrode insulating barrier is a kind of in sulfur hexafluoride gas laminated film, insulating oil composite cable paper, the compound crimped paper of epoxy resin or the silicone oil ptfe composite band.
In the another exemplary embodiment of the combination transformer of the utility model, said second input of said output branch road is electrically connected on earth potential.
In the another exemplary embodiment of the combination transformer of the utility model; Said resistor voltage divider circuit comprises a plurality of thick-film resistors; Said thick-film resistor is parallel to the two ends of said capacitance plate after being connected in series; One end of the said thick-film resistor after being connected in series is electrically connected on said Primary Conductor, and its other end is electrically connected on the said first input end of said output branch road.
In the another exemplary embodiment of the combination transformer of the utility model; Said resistor voltage divider circuit comprises a resistive band; Said resistive band is through be attached to the resistive slurry with the mode of laser printing or spraying the inner surface formation of said insulator continuously; One end of said resistive band is electrically connected on said high pressure flange, and its other end is electrically connected on the said first input end of said output branch road.With the part of insulator as voltage transformer, promptly guaranteed insulation system, the long life of material, the reliability and stability of combination transformer, practiced thrift the material of voltage transformer simultaneously, make design cost reduce.
In the another exemplary embodiment of the combination transformer of the utility model; Said current transformer is a low-power electronic current mutual inductor, and it comprises a magnetic core, is wound in secondary winding and a shunt resistance that is connected in said secondary winding end on the said magnetic core.
In the another exemplary embodiment of the combination transformer of the utility model; Be filled with dielectric between said current transformer and the said housing, said dielectric is a kind of in sulfur hexafluoride gas, insulating oil composite cable paper, the compound crimped paper of epoxy resin or the silicone oil ptfe composite band.
In the another exemplary embodiment of the combination transformer of the utility model; Be provided with an outlet box in the said base; Said outlet box comprises: an input module; Said first signal obtains secondary first signal after said input module voltage division processing, said secondary signal obtains the secondary secondary signal after said input module voltage division processing; Sampling module with said input module electrical isolation; Said sampling module can be sampled to said secondary first signal and said secondary secondary signal, and converts them to first digital signal and second digital signal that reflects said first signal and said secondary signal respectively; A modular converter, said modular converter receive said first digital signal and said second digital signal of said sampling module output, and these two kinds of digital quantities are incorporated in the message by communication protocol or communication protocol; An output module, said output module receive the said message of said modular converter output, and outwards export said message through the port of optical fiber or cable; A power module, said power module provides they work required electric energy to said input module, said sampling module, said modular converter and said output module.In combination transformer, input module, sampling module and modular converter all are positioned at the base of low-pressure side, help to improve the anti-electromagnetic interference capability and the reliability of combination transformer, and maintenance is convenient, does not need once to have a power failure and can overhaul or change module.
In another schematic execution mode of the combination transformer of the utility model; Be provided with an outlet box in the said base; Said outlet box comprises: an input module; Said first signal obtains secondary first signal after said input module voltage division processing, said secondary signal obtains the secondary secondary signal after said input module voltage division processing; Sampling module with said input module electrical isolation; Said sampling module can be sampled to said secondary first signal and said secondary secondary signal, and converts them to first digital signal and second digital signal that reflects said first signal and said secondary signal respectively; An output module, said output module receive said first digital signal and said second digital signal of said sampling module output, and outwards export said first digital signal and said second digital signal through the port of optical fiber or cable; A power module, said power module provides they work required electric energy to said input module, said sampling module and said output module.In combination transformer, input module and sampling module all are positioned at the base of low-pressure side, help to improve the anti-electromagnetic interference capability and the reliability of combination transformer, and maintenance is convenient, does not need once to have a power failure and can overhaul or change module.
In another schematic execution mode of the combination transformer of the utility model; Said outlet box also comprises: a synchronization module; Said synchronization module receives from the outside synchronizing signal of said combination transformer, and controls said sampling module according to said synchronizing signal and carry out synchronously.
Hereinafter will be with clear and definite understandable mode, the accompanying drawings preferred embodiment, and above-mentioned characteristic, technical characterictic, advantage and the implementation thereof of the combination transformer of the utility model further specified.
Description of drawings
Following accompanying drawing is only done schematic illustration and explanation to the utility model, does not limit the scope of the utility model.
Fig. 1 is a kind of structural representation of exemplary embodiment that is used for the combination transformer of electric power system.
Fig. 2 is used to explain a kind of electrical block diagram of exemplary embodiment of the voltage transformer of combination transformer shown in Figure 1.
Fig. 3 has shown the partial structurtes sketch map of a kind of exemplary embodiment of capacitance plate in the combination transformer of electric power system.
Fig. 4 is used to explain a kind of structural representation of exemplary embodiment of base of the combination transformer of electric 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 shield twisted-pair feeders
354 voltage double shield twisted-pair feeders
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
Embodiment
Understand for technical characterictic, purpose and effect to utility model have more clearly, contrast the embodiment of description of drawings the utility model at present, identical label is represented identical or structural similarity but the identical part of function in each figure.
For making drawing succinct, only schematically shown out the part relevant among each figure with the utility model, they do not represent its practical structures as product.In addition, so that drawing succinctly is convenient to understand, the parts that in some figure, have same structure or function have only schematically illustrated one of them, or have only marked one of them.
In this article, " one " not only representes " only this ", also can represent the situation of " more than ".Among this paper, " parallel " between two objects do not represented the absolute parallel on the geometric meaning, adds the deviation that allows man-hour but can comprise assembling.
In this article, earth potential, base 20, ground connection flange 33 and second input 384 can be electrically connected on the earth, and they have identical current potential.Housing 10, Primary Conductor 40 and high pressure flange 31 have identical current potential.
Fig. 1 has shown the structural representation of a kind of exemplary embodiment of the combination transformer that is used for electric power system.As shown in Figure 1, the combination transformer of the utility model comprises a housing 10, a base 20 and an insulator 30.Wherein, connect through insulator 30 between housing 10 and the base 20.In a kind of execution mode of the combination transformer of the utility model, insulator 30 comprises insulator.The end that insulator 30 is connected with housing 10 is provided with high pressure flange 31; And an end that is connected with base 20 is provided with ground connection flange 33, and wherein the connecting bolt (not shown) links to each other with housing 10 insulator 30 with ground connection flange 33 through high pressure flange 31 respectively with base 20.Insulator 30 can also be accomplished and being connected of housing 10 and base 20 through watering dress or bonding mode.
Be provided with a current transformer 12 in the housing 10.Current transformer 12 can detect the electric current in the Primary Conductor 40 of electric power system.Primary Conductor 40 is connected with supply line in the electric power system, its current potential and to flow through its electric current identical with supply line.Current transformer 12 will reflect that first signal of current value is sent to base 20 in the Primary Conductor 40.In a kind of exemplary embodiment of the combination transformer of the utility model, current transformer is the disclosed low-power electronic current mutual inductor of Chinese patent ZL200510024292.3, and it comprises a magnetic core, a secondary winding and a shunt resistance.The lead of secondary winding is wound on the magnetic core equably, and the end of secondary winding is connected in shunt resistance, and first signal of current value is sent to base through the transmission of double shield twisted-pair feeder in its reflection Primary Conductor of sensing.The concrete structure of current transformer can repeat no more at this referring to this utility model patent specification.Current transformer can also adopt other form, for example the current transformer of magneto optical effect.
In addition; Current transformer can have following several kinds of structures and adopt corresponding mode to measure: i) by two independently coil constitute; Each coil possesses an independently output at least; One of them coil is used for measuring the current value of electric power system, and another coil is used for trigger protection action when overload current appears in electric power system; Ii) in same low-power coil, only design an output; Not only satisfy measurement but also satisfy the required precision of protecting under the electric current of this output variable in different Primary Conductor; For example when the electric current in the Primary Conductor during smaller or equal to 200% specified Primary Conductor electric current; Coil output is satisfied and is measured a level error requirements, and when primary current when 200% specified Primary Conductor electric current is between the system short-circuit electric current, secondary is exported and is satisfied the protected level error requirements; Iii) design two-way output in same low-power coil, wherein measurement level error requirements is satisfied in one tunnel output, and the protected level error requirements is satisfied on another road.
Be filled with dielectric 11 between current transformer 12 and the housing 10, what dielectric 11 can be in sulfur hexafluoride gas, insulating oil composite cable paper, the compound crimped paper of epoxy resin or the silicone oil ptfe composite band is a kind of.
Be provided with a voltage transformer 32 in the insulator 30.Fig. 2 is used to explain a kind of electrical block diagram of exemplary embodiment of the voltage transformer 32 of combination transformer shown in Figure 1.As shown in the figure, voltage transformer 32 comprises a resistor voltage divider circuit 34, capacitance partial pressure circuit 36, an output branch road 38 and a second divided voltage resistance 37, and wherein capacitance partial pressure circuit 36 is in series by the multi-layer capacity screen.Output branch road 38 comprises a first input end 382 and one second input 384.Output branch road 38 can be sent to base 20 with the secondary signal of magnitude of voltage in the reflection Primary Conductor 40.Resistor voltage divider circuit 34 is parallel to capacitance partial pressure circuit 36, and promptly an end of resistor voltage divider circuit 34 is electrically connected on Primary Conductor 40, thereby has identical current potential with Primary Conductor 40, and the other end of resistor voltage divider circuit 34 is electrically connected on first input end 382.One end of capacitance partial pressure circuit 36 is electrically connected on Primary Conductor 40, and its other end is electrically connected on second input 384, and first input end 382 is electrically connected on the second divided voltage potential point 361 of capacitance partial pressure circuit 36.One end of second divided voltage resistance 37 is electrically connected on first input end 382, and its other end is electrically connected on second input 384.In illustrated exemplary embodiment, second input, 384 ground connection.
Owing to used the dividing potential drop mode of forming after series resistance and the series capacitance parallel connection, thereby widen the frequency domain scope of magnitude of voltage in the Primary Conductor that this combination transformer can accurately measure, especially avoided the loss of high-frequency voltage signal.Simultaneously, than traditional electrode formula capacitor voltage divider, in the multi-layer capacity screen electrode area of each layer capacitance increase a lot, and the thickness of interelectrode insulating barrier can do very thin, thereby greatly increased the capacitance of capacitance plate.In addition, the parasitic capacitance of capacitance plate is little, is not vulnerable to the interference of extraneous stray capacitance, does not therefore need to install at the scene the error of back calibration voltage instrument transformer, the plug and play of promptly having accomplished combination transformer.Simultaneously, this combination transformer not only can be used for the measurement of alternating voltage, can also be used for the measurement of direct voltage.
Fig. 3 has shown the partial structurtes sketch map of a kind of exemplary embodiment of capacitance plate in the combination transformer of electric power system.As shown in the figure, the bearing of trend of the electrode 362 of every layer capacitance screen is consistent with the bearing of trend of insulator 30 in the multi-layer capacity screen.Through this set method, the enough big capacitance plate of electrode area can be set as required, avoid the thickness of insulating layer between the electrode too small.In addition, the bearing of trend of electrode 362 also can be certain included angle with the bearing of trend of insulator 30.
Referring to Fig. 1 and Fig. 3; Insulator 30 also is provided with a fairlead 35; The electric current double shield twisted-pair feeder 352 that is used for first signal is passed to base 20 is arranged in fairlead 35 with the voltage double shield twisted-pair feeder 354 that is used for secondary signal is passed to base 20; Use the double shield twisted-pair feeder can reduce the interference of external electromagnetic field, but can also adopt other transmission meanss, the double shield twisted-pair feeder that fairlead 35 can protect inside to wear with function of shielding to the transmission signal.
Referring to Fig. 2 and Fig. 3, capacitance plate is wound on the fairlead 35 and perhaps is assembled on the fairlead after the moulding in advance, is connected in series through public electrode between each layer capacitance.Wherein, the electrode of capacitance plate can have the specific fexible film of conduction for aluminium foil, Copper Foil, thin film semiconductor or papery semiconductor etc.Insulating barrier between the electrode can be flexible insulation films such as sulphur hexafluoride laminated film, insulating oil composite cable paper, the compound crimped paper of epoxy resin or silicone oil ptfe composite band.The outermost layer electrode electricity of capacitance plate is connected in Primary Conductor 40, and the most last layer electrode electricity of capacitance plate is connected in earth potential.Second input 384 of output branch road 38 is electrically connected on the most last layer electrode of capacitance plate; Its first input end 382 is electrically connected in the capacitance partial pressure circuit 36 tap corresponding to second divided voltage potential point 361 place's electrodes; The potential difference of promptly gathering between this second divided voltage potential point 361 and the earth potential is exported signal as voltage; Thereby the secondary signal of magnitude of voltage on the output reflection Primary Conductor, wherein the second divided voltage potential point is meant that current potential is that the Primary Conductor current potential is by the pairing potential point of the voltage ratio of standard code.It will be understood by those skilled in the art that and to adjust the resistance value that output branch road 38 is connected in resistor voltage divider circuit 34 as required, to obtain proper voltage.
Referring to Fig. 2 and Fig. 3; Resistor voltage divider circuit 34 comprises a plurality of thick-film resistors, and after these thick-film resistors were connected in series, an end was connected in the outermost layer electrode of capacitance plate; The other end is connected in the second divided voltage potential point 361 of capacitance plate; Make resistor voltage divider circuit 34 be connected to capacitance partial pressure circuit 36, wherein an end of thick-film resistor is electrically connected on Primary Conductor 40, and its other end is electrically connected on the first input end 382 of output branch road 38.Can also the resistive slurry be attached to continuously on the inner surface of insulator through the mode of laser printing or spraying, form the resistive band of curve form.One end of resistive band is electrically connected on high pressure flange, and its other end is electrically connected with the first input end 382 of output branch road 38, and insulate with ground connection flange 33.Insulator 30 simultaneously as the part of voltage transformer, is promptly guaranteed insulation system, the long life of material, the reliability and stability of combination transformer, practiced thrift the material of voltage transformer simultaneously, made design cost reduce.
Fig. 4 is used to explain a kind of structural representation of exemplary embodiment of base 20 of the combination transformer of the utility model.As shown in the figure, be provided with an outlet box 22 in base 20 (not shown), it comprises an input module 24, sampling module 26, modular converter 25, output module 28, a synchronization module 27 and a power module 29.
Wherein, Input module 24 can receive respectively the secondary signal by magnitude of voltage in first signal of current value in the reflection Primary Conductor 40 of the voltage double shield twisted-pair feeder 354 of output branch road 38 and 352 inputs of electric current double shield twisted-pair feeder and the reflection Primary Conductor; And first signal and secondary signal carried out voltage division processing with their electromotive force of further reduction, obtain secondary first signal and secondary secondary signal after the voltage division processing respectively.
Sampling module 26 is sampled to secondary first signal and secondary secondary signal through the mode of isolation coupling, for example imports secondary first signal and secondary secondary signal through mode magneto-electric coupled or the photoelectricity coupling.Electrical isolation between sampling module 26 and the input module 24 is in order to the maintenance safety that guarantees outlet box 22 and avoid high pressure that devices in the outlet box 22 are impacted.Simultaneously, sampling module 26 first digital signal and second digital signal that also convert secondary first signal and the secondary secondary signal of analog form into digital form.
Output module 28 can receive formatted signal or direct receiving digital signals, and output module 28 converts formatted signal or digital signal into be fit to Ethernet or point-to-point transmission signal, and outwards exports through the port of optical fiber or cable.
As shown in Figure 4, outlet box 22 also comprises a synchronization module 27.It can receive from the outside synchronizing signal of combination transformer according to IEC61588, and carries out synchronously according to synchronizing signal control sampling module 26, with the measurement action of each combination transformer and test terminal in the collaborative electric power system.After losing outer synchronous signal, outlet box 22 automaticallyes switch, and makes input module 24, sampling module 26, modular converter 25 and output module 28 continuous firings in the outlet box 22 to guarantee that sampling work is uninterrupted continuously.
The combination transformer of electric power system; High-pressure side housing 10 is a passive structures; Be not provided with in the housing 10 and get ability, sampling and modular converter, input module 24, sampling module 26 and modular converter 25 all are positioned at the base 20 of low-pressure side, help to improve anti-electromagnetic interference capability, the reliability of combination transformer; And maintenance is convenient, does not need once to have a power failure and can overhaul or change module.
In this article, " schematically " expression " is served as instance, example or explanation ", should any diagram, the execution mode that be described to " schematically " in this article be interpreted as a kind of preferred or have more the technical scheme of advantage.
Be to be understood that; Though this specification is described according to each embodiment; But be not that each embodiment only comprises an independently technical scheme, this narrating mode of specification only is for clarity sake, and those skilled in the art should make specification as a whole; Technical scheme among each embodiment also can form other execution modes that it will be appreciated by those skilled in the art that through appropriate combination.
The listed a series of detailed description of preceding text only is specifying to the feasibility embodiment of the utility model; They are not the protection range in order to restriction the utility model, allly do not break away from equivalent embodiment or the change that the utility model skill spirit done and all should be included within the protection range of the utility model.
Claims (14)
1. the combination transformer that is used for electric power system comprises that a housing (10), a base (20) are connected the insulator (30) of said housing (10) and said base (20) with one;
Be provided with a current transformer (12) in the said housing (10); Said current transformer (12) can detect the electric current in the Primary Conductor (40) of said electric power system, and said current transformer (12) will reflect that first signal of current value in the said Primary Conductor (40) is sent to said base (20);
Be provided with a voltage transformer (32) in the said insulator (30), it is characterized in that, said voltage transformer (32) comprising:
An output branch road (38) comprises a first input end (382) and one second input (384), and wherein said output branch road (38) will reflect that the secondary signal of magnitude of voltage in the said Primary Conductor (40) is sent to said base (20);
A resistor voltage divider circuit (34), one of which end are electrically connected on said Primary Conductor (40), and its other end is electrically connected on said first input end (382);
A capacitance partial pressure circuit (36) that is in series by the multi-layer capacity screen; The one of which end is electrically connected on said Primary Conductor (40); Its other end is electrically connected on said second input (384), and said first input end (382) is electrically connected on the second divided voltage potential point (361) of said capacitance partial pressure circuit (36); And
A second divided voltage resistance (37), one of which end are electrically connected on said first input end (382), and its other end is electrically connected on said second input (384).
2. combination transformer as claimed in claim 1 is characterized in that, the bearing of trend of the electrode (362) of each layer capacitance screen is consistent with the bearing of trend of said insulator (30) in the said multi-layer capacity screen.
3. combination transformer as claimed in claim 1; It is characterized in that; Said combination transformer comprises a high pressure flange (31) and a ground connection flange (33); Wherein said insulator (30) is connected with said housing (10) through said high pressure flange (31), and said insulator (30) is connected with said base (20) through said ground connection flange (33).
4. combination transformer as claimed in claim 1; It is characterized in that; Said combination transformer comprises a fairlead (35); Electric current double shield twisted-pair feeder (352) and one who said first signal is passed to said base (20) is passed to the voltage double shield twisted-pair feeder (354) of said base (20) with said secondary signal, and wherein said electric current double shield twisted-pair feeder (352) and said voltage double shield twisted-pair feeder (354) are arranged in the said fairlead (35).
5. combination transformer as claimed in claim 4; It is characterized in that; Said capacitance plate is wound in said fairlead (35) and upward or after the moulding in advance is assembled on the said fairlead (35); The electrode of said capacitance plate (362) adopts a kind of in aluminium foil, Copper Foil, thin film semiconductor or the papery semiconductor, and the insulating barrier between said electrode (362) is a kind of in sulfur hexafluoride gas laminated film, insulating oil composite cable paper, the compound crimped paper of epoxy resin or the silicone oil ptfe composite band.
6. combination transformer as claimed in claim 1 is characterized in that, said second input (384) of said output branch road (38) is electrically connected on earth potential.
7. combination transformer as claimed in claim 1; It is characterized in that; Said resistor voltage divider circuit (34) comprises a plurality of thick-film resistors; Said thick-film resistor is parallel to the two ends of said capacitance plate after being connected in series, an end of the said thick-film resistor after being connected in series is electrically connected on said Primary Conductor (40), and its other end is electrically connected on the said first input end (382) of said output branch road (38).
8. combination transformer as claimed in claim 3; It is characterized in that; Said resistor voltage divider circuit (34) comprises a resistive band; Said resistive band is through forming the resistive slurry with the inner surface that the mode of laser printing or spraying is attached to said insulator (30) continuously, an end of said resistive band is electrically connected on said high pressure flange (31), and its other end is electrically connected on the said first input end (382) of said output branch road (38).
9. combination transformer as claimed in claim 1; It is characterized in that; Said current transformer (12) is a low-power electronic current mutual inductor, and it comprises a magnetic core, is wound in secondary winding and a shunt resistance that is connected in said secondary winding end on the said magnetic core.
10. combination transformer as claimed in claim 1; It is characterized in that; Be filled with dielectric (11) between said current transformer (12) and the said housing (10), said dielectric (11) is a kind of in sulfur hexafluoride gas, insulating oil composite cable paper, the compound crimped paper of epoxy resin or the silicone oil ptfe composite band.
11., it is characterized in that be provided with an outlet box (22) in the said base (20), said outlet box (22) comprising like each described combination transformer in the claim 1 to 10:
An input module (24), said first signal obtains secondary first signal after said input module (24) voltage division processing, and said secondary signal obtains the secondary secondary signal after said input module (24) voltage division processing;
Sampling module (26) with said input module (24) electrical isolation; Said sampling module (26) can be sampled to said secondary first signal and said secondary secondary signal, and converts them to first digital signal and second digital signal that reflects said first signal and said secondary signal respectively;
A modular converter (25), said modular converter (25) receive said first digital signal and said second digital signal of said sampling module (26) output, and these two kinds of digital quantities are incorporated in the message by communication protocol or communication protocol;
An output module (28), said output module (28) receive the said message of said modular converter (25) output, and outwards export said message through the port of optical fiber or cable;
A power module (29), said power module (29) provides they work required electric energy to said input module (24), said sampling module (26), said modular converter (25) and said output module (28).
12., it is characterized in that be provided with an outlet box (22) in the said base (20), said outlet box (22) comprising like each described combination transformer in the claim 1 to 10:
An input module (24), said first signal obtains secondary first signal after said input module (24) voltage division processing, and said secondary signal obtains the secondary secondary signal after said input module (24) voltage division processing;
Sampling module (26) with said input module (24) electrical isolation; Said sampling module (26) can be sampled to said secondary first signal and said secondary secondary signal, and converts them to first digital signal and second digital signal that reflects said first signal and said secondary signal respectively;
An output module (28); Said output module (28) receives said first digital signal and said second digital signal of said sampling module (26) output, and outwards exports said first digital signal and said second digital signal through the port of optical fiber or cable;
A power module (29), said power module (29) provides they work required electric energy to said input module (24), said sampling module (26) and said output module (28).
13. combination transformer as claimed in claim 11 is characterized in that, said outlet box (22) also comprises:
A synchronization module (27), said synchronization module (27) receive from the outside synchronizing signal of said combination transformer, and control said sampling module (26) according to said synchronizing signal and carry out synchronously.
14. combination transformer as claimed in claim 12 is characterized in that, said outlet box (22) also comprises:
A synchronization module (27), said synchronization module (27) receive from the outside synchronizing signal of said combination transformer, and control said sampling module (26) according to said synchronizing signal and carry out synchronously.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205714404U CN202373447U (en) | 2011-12-31 | 2011-12-31 | Combined transformer for power system |
| ES12813352.7T ES2586827T3 (en) | 2011-12-31 | 2012-12-21 | Combined 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 |
| HRP20160996TT HRP20160996T1 (en) | 2011-12-31 | 2012-12-21 | Combined transformer for power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205714404U CN202373447U (en) | 2011-12-31 | 2011-12-31 | Combined transformer for power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202373447U true CN202373447U (en) | 2012-08-08 |
Family
ID=46597141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205714404U Withdrawn - After Issue CN202373447U (en) | 2011-12-31 | 2011-12-31 | Combined transformer for power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202373447U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187162A (en) * | 2011-12-31 | 2013-07-03 | 上海Mwb互感器有限公司 | Combined transformer for power system |
-
2011
- 2011-12-31 CN CN2011205714404U patent/CN202373447U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103187162A (en) * | 2011-12-31 | 2013-07-03 | 上海Mwb互感器有限公司 | Combined transformer for power system |
| CN103187162B (en) * | 2011-12-31 | 2016-08-17 | 上海Mwb互感器有限公司 | Combination transformer for power system |
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