CN102788937B - Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line - Google Patents
Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line Download PDFInfo
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- CN102788937B CN102788937B CN201110130352.5A CN201110130352A CN102788937B CN 102788937 B CN102788937 B CN 102788937B CN 201110130352 A CN201110130352 A CN 201110130352A CN 102788937 B CN102788937 B CN 102788937B
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Abstract
The invention discloses a device for monitoring the electric strength of the insulating oil medium for an on-load tapping switch on line, comprising a high-voltage testing bin and a controller. The high-voltage testing bin is connected in series in a circulating pipe of an on-load switch on-line oil purifying device and provided with a pair of testing electrodes; the output end of a voltage-increasing transformer T1 is electrically connected with the wiring terminals of a pair of testing electrodes so as to apply testing voltage to the pair of testing electrodes; and the controller is used for controlling the voltage increasing and decreasing of the voltage-increasing transformer T1. When the oil breaks down, due to the dual protection of an overcurrent protection device and the controller, the high-voltage power supply is cut off quickly and automatically. When the electric strength of the insulating oil medium for the on-load tapping switch is lower than the predetermined index, the oil is filtered automatically on line by the high-precision high-efficiency particle removing filter and water removing filter, thus the content of particle impurities and trace water in the oil is reduced, the breakdown voltage of the oil is improved, the insulating level of the on-load tapping switch is guaranteed, and the requirements for high-security high-reliability power operation at present are adapted better.
Description
Technical field
The present invention relates to the insulating oil medium electric strength on-Line Monitor Device in a kind of electric component, particularly on-load tap changer insulating oil medium electric strength on-Line Monitor Device.
Background technology
Load ratio bridging switch is when on-load switches fast, and its insulating oil, under the effect of electric arc, will decompose and produce uncombined carbon, hydrogen, flammable hydrocarbon gas, also can produce trace meter particle.A part in the impurity such as uncombined carbon and metal particle can attachedly be amassed on shunting switch insulating part surface, especially near the concentrated band electrical contact of electric field; Another part is suspended in oil; The overwhelming majority is that deposition is at the bottom of switching grease chamber's case.The granule foreign that is distributed in insulating part surface will reduce the dielectric strength of insulating part, and the granule foreign being suspended in oil affects oily voltage breakdown, when micro-water content increases in oil, will speed up and reduces oily voltage breakdown, affects the dielectric level of load ratio bridging switch.Therefore according to stipulating in < < load ratio bridging switch operating maintenance guide rule > >: when in every switching in service 5000-10000 time or 1-2 or oil, voltage breakdown is lower than 25kV, should uncap clean change oil or oil strain once, every six months to 1 year or tap conversion 2000-4000 time is once sampling at least, as the oil strain that exceeds the time limit not do not clean yet insulating part dielectric level will continue to decline, jeopardize safe operation.
Loaded switch On-line oil filter is mainly used in the circulating filtration of on-load tap changer insulating oil, this device can be the in the situation that of the normal operation of voltage transformer system, effectively the pressure regulation of removal load tap changer oil chamber internal cause needs frequent band carry switching and produce a large amount of uncombined carbons and metal particle and can reduce micro-moisture, effectively improve oily dielectric strength, improve the safety and reliability of load ratio bridging switch work, and then reduce interruption maintenance number of times, extend maintenance cycle.
Being seen loaded switch On-line oil filter mostly adopts traditional absolute oil control method in the market, presses loaded switch running time or number of operations, regularly the control method of oil strain.This control method can not accurately comprehensively be reacted loaded switch oil quality, and precision is not high, is difficult to guarantee directly, accurately the dielectric strength of tap switch oil, can not meet the requirement of current operation power high security, high reliability development completely.
Due to the size of suspension granule foreign in tap switch oil and quantity and micro-water content fairly obvious on voltage breakdown impact, the height that is the voltage breakdown of oil in load ratio bridging switch switching grease chamber can directly reflect oil quality deterioration degree, therefore one of control technology key of on-line oil cleaning is whether on-line monitoring shunting switch dielectric oil dielectrical strength meets the requirements, thereby shunting switch dielectric oil dielectrical strength lower than set in advance index time, automatically carry out charged filtration, reduce granule foreign and micro-water content in oil, improve oily voltage breakdown, ensure the dielectric level of on-load shunting switch.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of on-load tap changer insulating oil medium electric strength on-Line Monitor Device for the existing deficiency of existing loaded switch On-line oil filter, this on-load tap changer insulating oil medium electric strength on-Line Monitor Device and loaded switch On-line oil filter are used in conjunction with, after On-line oil filter starts, all processes can move control automatically, measure accurately, easy and simple to handle, safe and reliable, antijamming capability is strong, can be in severe site environment reliability service.
Technical matters to be solved by this invention can be achieved through the following technical solutions:
On-load tap changer insulating oil medium electric strength on-Line Monitor Device, is characterized in that, comprising:
One is serially connected with the Hi-pot test storehouse in the circulation line of loaded switch On-line oil filter;
Be configured in a pair of test electrode on the relative bulkhead in described Hi-pot test storehouse one, the axis of described a pair of test electrode is vertical with the insulating oil flow direction in Hi-pot test storehouse, leaves adjustable test gap between the test lead of this pair of test electrode; On another relative bulkhead in described Hi-pot test storehouse, dispose in-line interface and fuel-displaced pipe interface, described Hi-pot test storehouse is serially connected in the circulation line of loaded switch On-line oil filter by described in-line interface and fuel-displaced pipe interface;
One step-up transformer T1, the output terminal of this step-up transformer T1 is electrically connected to apply test voltage to a pair of test electrode with the binding post of a pair of test electrode; The input end of this step-up transformer T1 disposes in order to the primary winding of input voltage with for the secondary coil of test voltage, wherein the termination of primary winding is by self-locking contact KM-1, the overcurrent relay KA of A.C. contactor, the output terminal that Current Transmit is connected to the removable electric voltage regulator T2 of an interchange, and this input end T2 that exchanges removable electric voltage regulator connects AC power;
One controller, this controller disposes and exchanges removable electric voltage regulator voltage sense signal end, step-up transformer voltage sense signal end, current transformer signal input part, manual/auto switch signal input part, starts manual ringing input end, the manual ringing input end that boosts, step-down manual ringing input end, boost signal output terminal, step-down signal output part, A.C. contactor control end and loaded switch On-line oil filter control end; The output terminal that wherein exchanges removable electric voltage regulator voltage sense signal termination voltage mutual inductor VT1, the input end of voltage transformer (VT) VT1 is connected with the output terminal of the removable electric voltage regulator T2 of described interchange; Step-up transformer voltage sense signal end is connected with the output terminal of voltage transformer (VT) VT2, and the input end of voltage transformer (VT) VT2 is connected with the secondary coil of described step-up transformer T1; Current transformer signal input part connects the signal output part of Current Transmit; Manual/auto switch signal input part, start one end that manual ringing input end, the manual ringing input end that boosts, step-down manual ringing input end are taken over respectively moving/automatic change over, start button switch, boost button switch, step-down pushbutton switch, manual/auto switch, start button switch, boost button switch, the step-down pushbutton switch other end and connect after connect AC power; Boost signal output terminal meets the described removable electric voltage regulator T2 that exchanges with step-down signal output part, and A.C. contactor control end connects the line bag of A.C. contactor KM by the normally closed interlock KA-1 of an overcurrent relay KA; Loaded switch On-line oil filter control end S is connected to load switch On-line oil filter.
In a preferred embodiment of the invention, described Hi-pot test storehouse is arranged in a casing with step-up transformer T1 together with loaded switch On-line oil filter, this casing has a box plate and four side box plates that are connected with described box plate surrounding and the chamber door of hinge on a side box plate, and chamber door and box plate are oppositely arranged; Between described chamber door and opposite side boxboard, be provided with the latch switch assembly of uncapping, this latch switch assembly of uncapping is connected with the signal input part of uncapping being configured on described controller.
In a preferred embodiment of the invention, described step-up transformer T1 and Hi-pot test storehouse are arranged on the box plate of described casing, wherein the output low pressure end of step-up transformer T1 is positioned at step-up transformer T1 and is connected to form ground connection near one end of described box plate and with described box plate, and the output high-pressure side of step-up transformer T1 is positioned at step-up transformer T1 near one end of chamber door; Be configured in the coaxial cable of a pair of test electrode on described Hi-pot test storehouse perpendicular to described box plate, wherein binding post and the described box plate of the test electrode of close box plate one side are connected to form ground connection, and the binding post of test electrode and the output high-pressure side of step-up transformer T1 of close chamber door one side are connected by an insulated line; Be configured in the in-line interface in described Hi-pot test storehouse and the coaxial cable of fuel-displaced pipe interface is parallel to box plate and perpendicular to ground, for ground, the position of in-line interface is higher than fuel-displaced pipe interface.
In a preferred embodiment of the invention, on the binding post of the test electrode being connected with output high-pressure side with step-up transformer T1 at the output high-pressure side of described step-up transformer T1 and insulated line, be covered with an insulating boot, described insulating boot is fixed on the skeleton of described step-up transformer T1 by securing member.
In a preferred embodiment of the invention, Hi-pot test storehouse comprises that one is made by insulating material and circular Cang Gai that the cylindrical shape warehouse and of an end opening is made by insulating material, and described Cang Gai is the opening part at cylindrical shape warehouse by screw threads for fastening, on at the bottom of the storehouse of described circular Cang Gai and cylindrical shape warehouse, offer respectively the installation of the electrode in order to an installation testing electrode threaded hole, each test electrode comprises a conducting rod, one circular electric pole piece and a binding post, described circular electric pole piece is screwed in the test lead of conducting rod, binding post is screwed in the terminals of conducting rod, terminals at described conducting rod are provided with thread segment, electrode on thread segment on the conducting rod of a pair of test electrode is threaded onto respectively at the bottom of Cang Gai and storehouse is installed in threaded hole and can be made a pair of test electrode be arranged on Hi-pot test storehouse by being screwed in fastening screw nut on described thread segment, binding post on a pair of test electrode is positioned at the outside in Hi-pot test storehouse, circular electric pole piece on a pair of test electrode is positioned at described Hi-pot test storehouse, on the bulkhead of described cylindrical shape warehouse, offer in-line interface and the fuel-displaced pipe interface of coaxial cable, in-line interface and fuel-displaced pipe interface are screw, on described in-line interface and fuel-displaced pipe interface, are connected with respectively inlet connector and flowline connection to subsea.
For convenient, circular electric pole piece is screwed onto on conducting rod, the diameter of described fuel-displaced pipe interface should be greater than the diameter of described circular electric pole piece, and described flowline connection to subsea is arranged in described fuel-displaced pipe interface by a transition cover, wherein said transition cover is screwed in fuel-displaced pipe interface, and flowline connection to subsea is screwed in the endoporus of described transition cover.
In order to form good sealing, between between described Cang Gai and described cylindrical shape warehouse, between the conducting rod of a test electrode and storehouse lid, at the bottom of the conducting rod of another test electrode and storehouse, between inlet connector and in-line interface, between transition cover and fuel-displaced pipe interface, between flowline connection to subsea and transition cover, be provided with seal.
In a preferred embodiment of the invention, in described casing, be also provided with a high-pressure channel storehouse, described high-pressure channel storehouse is configured between described Hi-pot test storehouse and step-up transformer T1, wherein the output low pressure end of step-up transformer T1 and the binding post of a test electrode are connected with a side box plate of described casing and ground connection, the output high-pressure side of step-up transformer T1 enters in high-pressure channel storehouse through a bulkhead in described high-pressure channel storehouse, the binding post of described another test electrode is inserted in high-pressure channel storehouse by another bulkhead in described high-pressure channel storehouse, be connected by flexible circuit conductor with the output high-pressure side of described step-up transformer T1.
Described a pair of test electrode is fixed on the bulkhead in Hi-pot test storehouse by holding screw separately.
Controller of the present invention consists of 32 8-digit microcontrollers and peripheral circuit.
Owing to having adopted technical scheme as above, the present invention be take 32 8-digit microcontrollers as MCU, and all processes can move control automatically, and giant-screen LCD shows, measure accurately, man-machine interface is directly perceived, easy and simple to handle, safe and reliable, antijamming capability is strong, can be in severe site environment reliability service.The totally enclosed frame insulation hyperbaric chamber that the Hi-pot test of oil-insulation intensity partly adopts special process to make, built-in extraordinary dry type high-strength insulating testing transformer, supply with 0-60KV measurement range, and volume is little, lightweight, as long as ground wire grounded, reliably guaranteed safely; When oil puncture, overcurrent protective device and controller duplicate protection, can quick automatic cut-off high-voltage power supply; Shunting switch dielectric oil dielectrical strength lower than set in advance index time, automatically carry out online oil filtration, through high precision, high efficiency particulate filters and except after water filter, reduce granule foreign and micro-water content in oil, improve oily voltage breakdown, ensure the dielectric level of on-load shunting switch, better adapted to the requirement of current operation power high security, high reliability.
Accompanying drawing explanation
Fig. 1 is the structural representation of box house described in the embodiment of the present invention 1.
Fig. 2 is the electric principle schematic of the embodiment of the present invention 1.
Fig. 3 is the assembling schematic diagram between the Hi-pot test storehouse of the embodiment of the present invention 2 and a pair of measuring head, inlet connector, flowline connection to subsea.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Embodiment 1
Referring to Fig. 1, on-load tap changer insulating oil medium electric strength on-Line Monitor Device of the present invention and loaded switch On-line oil filter (not shown) are arranged in a casing 100.The box plate that this casing 100 is made of metal forms with four side box plates that are connected with box plate surrounding, on a side box plate of casing 100, be hinged with a chamber door, between this chamber door and opposite side boxboard, be provided with the latch switch assembly 110 of uncapping, this latch switch assembly 110 of uncapping is equivalent to a door switch, its signal is by being arranged in signal input part 210 access controllers 200 of uncapping on controller 200 (referring to Fig. 2), once chamber door is opened, the latch switch assembly 110 of uncapping sends a signal to controller 200, controller 200 just cuts off the power supply of step-up transformer T1, to guarantee safety.
In Hi-pot test storehouse 120 of the interior configuration of casing 100, Hi-pot test storehouse 120 adopts heatproof insulating material to make.Before Hi-pot test storehouse 120, be provided with door (not shown), between this door and the warehouse in Hi-pot test storehouse 120, be threaded connection, be provided with seal between the two.On the bulkhead of the top in Hi-pot test storehouse 120, be provided with in-line interface 121, and on the Lower Hold wall in Hi-pot test storehouse 120, be provided with fuel-displaced pipe interface 122, in-line interface 121 and fuel-displaced pipe interface 122 are extended outside casing 100 by two side box plates of casing 100 respectively, and Hi-pot test storehouse 120 just can be serially connected in the circulation line of loaded switch On-line oil filter 300 (referring to Fig. 2) by in-line interface 121 and fuel-displaced pipe interface 122 like this.Open loaded switch On-line oil filter 300, just the insulating oil in shunting switch can be sent in high pressure detection storehouse 120 and detect.On the bulkhead of the both sides in Hi-pot test storehouse 120, be provided with slide 123 and 124, a pair of test electrode A1 and A2 are inserted in Hi-pot test storehouse 120 by slide 123 and 124 respectively, and the axis of a pair of test electrode A1 and A2 is vertical with the insulating oil flow direction in Hi-pot test storehouse 120.
At a pair of test electrode A1 and A2, leave test gap Z, this test gap Z can regulate by mobile a pair of test electrode A1 and A2.On slide 123 and 124, holding screw (not shown) can also be set, after test gap Z adjusts, can be by holding screw by test electrode A1 and A2 tightening.
High-pressure channel storehouse 130 and step-up transformer T1 are also installed in casing 100, and high-pressure channel storehouse 130 is configured between Hi-pot test storehouse 120 and step-up transformer T1.High-pressure channel storehouse 130 be provided with above door (not shown), between the warehouse in the door in this high-pressure channel storehouse 130 and high-pressure channel storehouse 130, by the screw that insulate, be connected, be provided with seal between the two.The binding post of test electrode A1 is connected with box plate and passes through the direct ground connection of box plate, the binding post of test electrode A2 is inserted in high-pressure channel storehouse 130 by the bulkhead slip in high-pressure channel storehouse 130, the output low pressure end (not shown) of the output terminal T1 of step-up transformer T1 is connected with box plate and passes through the direct ground connection of box plate, the output high-pressure side T1b of step-up transformer T1 inserts in high-pressure channel storehouse 130 through the bulkhead in high-pressure channel storehouse 130, and by flexible circuit conductor 131, is connected between the binding post of test electrode A2.The effect in high-pressure channel storehouse 130 is the high-tension circuit passages that form between step-up transformer T1 and Hi-pot test storehouse 120, makes high-tension circuit insulation against ground.Adopt after said structure, between Hi-pot test storehouse 120 and high-pressure channel storehouse 130, leave suitable gap, allowed corresponding position to move, be convenient to Hi-pot test storehouse 120 and just can be concatenated in the circulation line of loaded switch On-line oil filter 300 by in-line interface 121 and fuel-displaced pipe interface 122.
The low-voltage cable of step-up transformer T1 is drawn and is connected to controller 200 (referring to Fig. 2) by a side box plate of casing 100
Referring to Fig. 2, the output terminal of step-up transformer T1 is electrically connected to apply test voltage to a pair of test electrode A1 and A2 with the binding post of a pair of test electrode A1 and A2.At the input end of this step-up transformer T1, dispose in order to the primary winding T1-1 of input voltage with the secondary coil T2-1 of a test voltage, wherein the termination of primary winding T1-1 is by self-locking contact KM-1, the overcurrent relay KA of A.C. contactor, the output terminal that Current Transmit is connected to the removable electric voltage regulator T2 of an interchange, and this input end T2 that exchanges removable electric voltage regulator connects AC power by switch 1SA;
Controller 200 consists of 32 8-digit microcontrollers and peripheral circuit, and it disposes and exchange removable electric voltage regulator voltage sense signal end VT1-1, step-up transformer voltage sense signal end VT2-1, current transformer signal input part CT-1, manual/auto switch signal input part K1-1, starts manual ringing input end K2-1, the manual ringing input end K3-1 that boosts, step-down manual ringing input end K4-1, boost signal output terminal V1, step-down signal output part V2, A.C. contactor control end K5 and loaded switch On-line oil filter control end S; Wherein exchange the output terminal that removable electric voltage regulator voltage sense signal end VT1-1 meets voltage transformer (VT) VT1, the input end of voltage transformer (VT) VT1 is connected with the output terminal that exchanges removable electric voltage regulator T2; Step-up transformer voltage sense signal end VT2-1 is connected with the output terminal of voltage transformer (VT) VT2, and the input end of voltage transformer (VT) VT2 is connected with the secondary coil T2-1 termination of step-up transformer T1; Current transformer signal input part CT-1 connects the signal output part of Current Transmit; Manual/auto switch signal input part K1-1, start one end that manual ringing input end K2-1, the manual ringing input end K3-1 that boosts, step-down manual ringing input end K4-1 take over respectively moving/automatic change over K1, start button K switch 2, boost button K switch 3, step-down button switch K 4, manual/auto switch K1, start button K switch 2, boost button K switch 3, step-down button switch K 4 other ends and connect after connect AC power; Boost signal output terminal V1 connects and exchanges removable electric voltage regulator T2 with step-down signal output part V2, and A.C. contactor control end K5 connects the coil of A.C. contactor KM by the normally closed interlock KA-1 of overcurrent relay KA; Loaded switch On-line oil filter control end S is connected to load switch On-line oil filter 300.
Embodiment 2
The present embodiment is except the structure in Hi-pot test storehouse and be unworthy of setting high pressure passageway storehouse, and all the other are identical with embodiment 1.
In this embodiment, step-up transformer T1 and Hi-pot test storehouse 120 ' are arranged on the box plate of casing 100, wherein the output low pressure end of step-up transformer T1 is positioned at step-up transformer T1 and is connected to form ground connection near one end of box plate and with box plate, and the output high-pressure side T1b of step-up transformer T1 is positioned at step-up transformer T1 near one end of chamber door.
Be configured in the coaxial cable of a pair of test electrode A1 on Hi-pot test storehouse 120 ' and A2 perpendicular to box plate, wherein binding post and the box plate of the test electrode A1 of close box plate one side are connected to form ground connection, and the binding post A2 of test electrode and the output high-pressure side T1b of step-up transformer T1 of close chamber door one side are connected by an insulated line; Be configured in the in-line interface in Hi-pot test storehouse 120 ' and the coaxial cable of fuel-displaced pipe interface is parallel to box plate and perpendicular to ground, for ground, the position of in-line interface is higher than fuel-displaced pipe interface.
Referring to Fig. 3, Hi-pot test storehouse 120 ' comprises that one is made by insulating material and circular storehouse lid 122 ' that the cylindrical shape warehouse 121 ' and of an end opening is made by insulating material, storehouse lid 122 ' is by insulation securing member, and the screw that for example insulate is fixed on the opening part of cylindrical shape warehouse 121 '.Between storehouse lid 122 ' and cylindrical shape warehouse 121 ', be provided with O RunddichtringO 123 '.
On 121a ' at the bottom of the storehouse of circular storehouse lid 122 ' and cylindrical shape warehouse 121 ', offer respectively an electrode threaded hole 122a ' and 121aa ' are installed, in order to installation testing electrode.On the bulkhead 121b ' of cylindrical shape warehouse 121 ', offer in-line interface 121ba ' and the fuel-displaced pipe interface 121bb ' of coaxial cable, the diameter of fuel-displaced pipe interface 121bb ' should be greater than the diameter of circular electric pole piece A12, A22, so conveniently circular electric pole piece A12, A22 is screwed onto on conducting rod A11, A21.In-line interface 121ba ' and fuel-displaced pipe interface 121bb ' are screw.
Test electrode A1 comprises a conducting rod A11, a circular electric pole piece A12 and a binding post A13, and circular electric pole piece A12 is screwed in the test lead of conducting rod A11, and binding post A13 is screwed in the terminals of conducting rod A11, at the terminals of conducting rod A11, is provided with thread segment.Test electrode A2 comprises a conducting rod A21, a circular electric pole piece A22 and a binding post A23, and circular electric pole piece A22 is screwed in the test lead of conducting rod A21, and binding post A23 is screwed in the terminals of conducting rod A21, at the terminals of conducting rod A21, is provided with thread segment.
During concrete installation, first the thread segment on conducting rod A21, the A11 of a pair of test electrode A2, A1 is threaded onto respectively to the electrode on 121a ' at the bottom of storehouse lid 122 ' and storehouse and installs that in threaded hole 122a ' and 121aa ', to make conducting rod A21, the A11 of a pair of test electrode A2, A1 be arranged on Hi-pot test storehouse 120 ' upper, binding post A23, the A13 on a pair of test electrode A2, A1 is positioned at the outside in Hi-pot test storehouse 120 '.Then by fuel-displaced pipe interface 121bb ', circular electric pole piece A22, A12 are sent to Hi-pot test storehouse 120 ' and also by conducting rod A21, the A11 of rotary test electrode A 2, A1, are screwed on the test lead of conducting rod A21, A11 respectively.After whole test electrode A2, A1 install, rotary conductive bar A21, A11, regulate the test gap Z between circular electric pole piece A22, A12, then will be screwed in fastening screw nut A24, A14 tight on conducting rod A21, A11 thread segment.Need to regulate the test gap Z between circular electric pole piece A22, A12 next time, unclamps fastening screw nut A24, A14 just passable.
Finally inlet connector 124 ' is screwed in to in-line interface 121ba ' upper, it is upper that transition cover 125 ' is screwed in fuel-displaced pipe interface 121bb ', and flowline connection to subsea 126 ' is screwed in the endoporus of transition cover 125 '.
In order to form good sealing, between the conducting rod A21 of test electrode A2 and storehouse lid 122 ', at the bottom of the conducting rod A11 of test electrode A1 and storehouse between 121a125 ', between inlet connector 124 ' and in-line interface 121ba ', between transition cover 125 ' and fuel-displaced pipe interface 121bb ', be provided with seal 127 ', 128 ', 129 ', 130 ', 131 ' between flowline connection to subsea 126 ' and transition cover 125 '.
On the binding post of the test electrode A2 being connected with output high-pressure side T1b with step-up transformer T1 at the output high-pressure side T1b of step-up transformer T1 and insulated line, be covered with an insulating boot, this insulating boot is by securing member, and for example screw is fixed on the skeleton of step-up transformer T1.
The ultimate principle of the present invention's test: the voltage higher than normal work is added on the insulator of equipment under test, and continues one section of official hour, if its insulativity is enough good, the voltage of superimposed just only can produce very little leakage current.If an equipment under test insulator is in official hour, its leakage current keeps within the limits prescribed, just can determine that this equipment under test can safe operation under normal service condition.According to the regulation of IEC61010, test voltage must little by little rise to desired trial voltage value (such as 5kV etc.) in 5s, stable being added on tested insulator of warranty test magnitude of voltage is no less than 5s, now the leakage current threshold of the leakage current value on institute survey time road and standard regulation, just can judge whether the insulating property of test product meet standard.After test finishes, trial voltage must little by little be down to zero in official hour.
Test process of the present invention is: controller 200 of the present invention can be in real time or fixed time test shunting switch insulating oil dielectric strength.During test, after controller 200 electrifying startups, before shunting switch insulating oil withstand voltage starts, controller 200 sends turndown relay control signal by step-down signal output part V2, control and exchange removable electric voltage regulator T2 step-down return-to-zero, it is zero that controller 200 detects the removable electric voltage regulator T2 output voltage of interchange by voltage transformer (VT) VT1, closed contactor KM, KM keeps self-locking, connect high voltage step-up and become T1, controller 200 boost signal output terminal V1 then send out a booster relay signal controlling and exchange removable electric voltage regulator T2 automatic uniform and boost, controller 200 detects by voltage transformer (VT) VT2 output voltage that high voltage step-up becomes T1 and reaches default definite value and stop boosting, the output that high voltage step-up becomes T1 presets threshold voltage maintenance certain predetermined after the time, if shunting switch insulating oil does not puncture and leakage current does not reach and surpass controller or the default definite value of overcurrent relay KA, illustrate that dielectric oil dielectrical strength is qualified, now loaded switch On-line oil filter 300 does not start.
If shunting switch insulating oil punctures or leakage current reaches and surpass the default definite value of controller or overcurrent relay KA during aforementioned, controller 200 or overcurrent relay KA action, all will disconnect contactor KM-1, cutoff high is boosted and is become T1 primary side power supply, with Time Controller 200 step-down signal output part V2, control and exchange removable electric voltage regulator T2 step-down return-to-zero, and record breakdown voltage value.Controller 200 sends enabling signal by loaded switch On-line oil filter control end S to loaded switch On-line oil filter 300, and loaded switch On-line oil filter 300 starts oil strain.
The full-automatic mode of the present invention has realized the work that on-load tap changer insulating oil dielectric strength is measured, and original loaded down with trivial details and dangerous work is become to safe and easy.Adopt the removable electric voltage regulator automatic uniform of interchange to boost, when insulating oil punctures, protection of instrumentation system is cut off working power automatically.N continuous time test can be set and average, dispersed little, accuracy is high.Test oil accesses the Hi-pot test storehouse of insulation and obturation online by isolated pipe.
The present invention be take 32 8-digit microcontrollers as MCU, and all processes can move control automatically, and giant-screen LCD shows, measures accurately, and man-machine interface is directly perceived, easy and simple to handle, safe and reliable, and antijamming capability is strong, can be in severe site environment reliability service.The totally enclosed frame insulation Hi-pot test storehouse that the Hi-pot test of oil-insulation intensity partly adopts special process to make, built-in extraordinary dry type high-strength insulating test step-up transformer, supply with the maximum measurement range of 0-60KV, and volume is little, lightweight, as long as standard is ground wire grounded, reliably guaranteed safely; When oil puncture, overcurrent protective device and controller duplicate protection, can quick automatic cut-off high-voltage power supply; Shunting switch dielectric oil dielectrical strength lower than set in advance index time, automatically carry out online oil filtration, through high precision, high efficiency particulate filters and except after water filter, reduce granule foreign and micro-water content in oil, improve oily voltage breakdown, ensure the dielectric level of on-load shunting switch, better adapted to the requirement of current operation power high security, high reliability.
The various structures of above-mentioned enforcement are only used for illustrating the present invention, but are not limited to concrete version involved in the present invention, but without departing from the principles of the present invention, contain the embodiment of the present invention is carried out to modification.Within all any conversion of doing in this case spirit or replacement all belong to the scope of the claims in the present invention.
Claims (10)
1. on-load tap changer insulating oil medium electric strength on-Line Monitor Device, is characterized in that, comprising:
One is serially connected with the Hi-pot test storehouse in the circulation line of loaded switch On-line oil filter;
Be configured in a pair of test electrode on the relative bulkhead in described Hi-pot test storehouse one, the axis of described a pair of test electrode is vertical with the insulating oil flow direction in Hi-pot test storehouse, leaves adjustable test gap between the test lead of this pair of test electrode; On another relative bulkhead in described Hi-pot test storehouse, dispose in-line interface and fuel-displaced pipe interface, described Hi-pot test storehouse is serially connected in the circulation line of loaded switch On-line oil filter by described in-line interface and fuel-displaced pipe interface;
One step-up transformer T1, the output terminal of this step-up transformer T1 is electrically connected to apply test voltage to a pair of test electrode with the binding post of a pair of test electrode; The input end of this step-up transformer T1 disposes in order to the primary winding of input voltage with for the secondary coil of test voltage, wherein the termination of primary winding is by self-locking contact KM-1, the overcurrent relay KA of A.C. contactor, the output terminal that Current Transmit is connected to the removable electric voltage regulator T2 of an interchange, and this input end T2 that exchanges removable electric voltage regulator connects AC power;
One controller, this controller disposes and exchanges removable electric voltage regulator voltage sense signal end, step-up transformer voltage sense signal end, current transformer signal input part, manual/auto switch signal input part, starts manual ringing input end, the manual ringing input end that boosts, step-down manual ringing input end, boost signal output terminal, step-down signal output part, A.C. contactor control end and loaded switch On-line oil filter control end; The output terminal that wherein exchanges removable electric voltage regulator voltage sense signal termination voltage mutual inductor VT1, the input end of voltage transformer (VT) VT1 is connected with the output terminal of the removable electric voltage regulator T2 of described interchange; Step-up transformer voltage sense signal end is connected with the output terminal of voltage transformer (VT) VT2, and the input end of voltage transformer (VT) VT2 is connected with the secondary coil of described step-up transformer T1; Current transformer signal input part connects the signal output part of Current Transmit; Manual/auto switch signal input part, start one end that manual ringing input end, the manual ringing input end that boosts, step-down manual ringing input end are taken over respectively moving/automatic change over, start button switch, boost button switch, step-down pushbutton switch, manual/auto switch, start button switch, boost button switch, the step-down pushbutton switch other end and connect after connect AC power; Boost signal output terminal meets the described removable electric voltage regulator T2 that exchanges with step-down signal output part, and A.C. contactor control end connects the line bag of A.C. contactor KM by the normally closed interlock KA-1 of an overcurrent relay KA; Loaded switch On-line oil filter control end S is connected to load switch On-line oil filter.
2. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 1, it is characterized in that, described Hi-pot test storehouse is arranged in a casing with step-up transformer T1 together with loaded switch On-line oil filter, this casing has a box plate and four side box plates that are connected with described box plate surrounding and the chamber door of hinge on a side box plate, and chamber door and box plate are oppositely arranged; Between described chamber door and opposite side boxboard, be provided with the latch switch assembly of uncapping, this latch switch assembly of uncapping is connected with the signal input part of uncapping being configured on described controller.
3. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 2, it is characterized in that, described step-up transformer T1 and Hi-pot test storehouse are arranged on the box plate of described casing, wherein the output low pressure end of step-up transformer T1 is positioned at step-up transformer T1 and is connected to form ground connection near one end of described box plate and with described box plate, and the output high-pressure side of step-up transformer T1 is positioned at step-up transformer T1 near one end of chamber door; Be configured in the coaxial cable of a pair of test electrode on described Hi-pot test storehouse perpendicular to described box plate, wherein binding post and the described box plate of the test electrode of close box plate one side are connected to form ground connection, and the binding post of test electrode and the output high-pressure side of step-up transformer T1 of close chamber door one side are connected by an insulated line; Be configured in the in-line interface in described Hi-pot test storehouse and the coaxial cable of fuel-displaced pipe interface is parallel to box plate and perpendicular to ground, for ground, the position of in-line interface is higher than fuel-displaced pipe interface.
4. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 3, it is characterized in that, on the binding post of the test electrode being connected with output high-pressure side with step-up transformer T1 at the output high-pressure side of described step-up transformer T1 and insulated line, be covered with an insulating boot, described insulating boot is fixed on the skeleton of described step-up transformer T1 by securing member.
5. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 2, it is characterized in that, described Hi-pot test storehouse comprises that one is made by insulating material and circular Cang Gai that the cylindrical shape warehouse and of an end opening is made by insulating material, and described Cang Gai is fixed on the opening part of cylindrical shape warehouse by insulation securing member, on at the bottom of the storehouse of described circular Cang Gai and cylindrical shape warehouse, offer respectively the installation of the electrode in order to an installation testing electrode threaded hole, each test electrode comprises a conducting rod, one circular electric pole piece and a binding post, described circular electric pole piece is screwed in the test lead of conducting rod, binding post is screwed in the terminals of conducting rod, terminals at described conducting rod are provided with thread segment, electrode on thread segment on the conducting rod of a pair of test electrode is threaded onto respectively at the bottom of Cang Gai and storehouse is installed in threaded hole and can be made a pair of test electrode be arranged on Hi-pot test storehouse by being screwed in fastening screw nut on described thread segment, binding post on a pair of test electrode is positioned at the outside in Hi-pot test storehouse, circular electric pole piece on a pair of test electrode is positioned at described Hi-pot test storehouse, on the bulkhead of described cylindrical shape warehouse, offer in-line interface and the fuel-displaced pipe interface of coaxial cable, in-line interface and fuel-displaced pipe interface are screw, on described in-line interface and fuel-displaced pipe interface, are connected with respectively inlet connector and flowline connection to subsea.
6. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 5, it is characterized in that, the diameter of described fuel-displaced pipe interface should be greater than the diameter of described circular electric pole piece, and described flowline connection to subsea is arranged in described fuel-displaced pipe interface by a transition cover, wherein said transition cover is screwed in fuel-displaced pipe interface, and flowline connection to subsea is screwed in the endoporus of described transition cover.
7. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 6, it is characterized in that, between between described Cang Gai and described cylindrical shape warehouse, between the conducting rod of a test electrode and storehouse lid, at the bottom of the conducting rod of another test electrode and storehouse, between inlet connector and in-line interface, between transition cover and fuel-displaced pipe interface, between flowline connection to subsea and transition cover, be provided with seal.
8. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 2, it is characterized in that, in described casing, be also provided with a high-pressure channel storehouse, described high-pressure channel storehouse is configured between described Hi-pot test storehouse and step-up transformer T1, wherein the output low pressure end of step-up transformer T1 and the binding post of a test electrode are connected with a side box plate of described casing and ground connection, the output high-pressure side of step-up transformer T1 enters in high-pressure channel storehouse through a bulkhead in described high-pressure channel storehouse, the binding post of described another test electrode is inserted in high-pressure channel storehouse by another bulkhead in described high-pressure channel storehouse, be connected by flexible circuit conductor with the output high-pressure side of described step-up transformer T1.
9. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 2, is characterized in that, described a pair of test electrode is fixed on the bulkhead in Hi-pot test storehouse by holding screw separately.
10. on-load tap changer insulating oil medium electric strength on-Line Monitor Device as claimed in claim 1, is characterized in that, described controller consists of 32 8-digit microcontrollers and peripheral circuit.
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| CN201110130352.5A CN102788937B (en) | 2011-05-19 | 2011-05-19 | Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line |
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| CN201110130352.5A CN102788937B (en) | 2011-05-19 | 2011-05-19 | Device for monitoring electric strength of insulating oil medium for on-load tapping switch on line |
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| CN106093740B (en) * | 2016-08-04 | 2018-10-19 | 国家电网公司 | Automatic constant-temperature formula dielectric oil dielectrical strength tester |
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| JP2019067989A (en) * | 2017-10-04 | 2019-04-25 | 株式会社日立製作所 | Diagnostic system of on-load tap changeover device, diagnostic method of on-load tap changeover device, diagnostic system of power transformer |
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| CN114089019A (en) * | 2021-10-28 | 2022-02-25 | 广西电网有限责任公司桂林供电局 | Portable heating type insulating oil breakdown voltage tester and testing method |
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