CN2189348Y - Novel three-phase power transformer - Google Patents

Abstract

The utility model provides a novel three-phase power transformer, can improve the terminal three-phase voltage of electric power system high voltage transmission and distribution lines about 15%, it is by the shell, three primary winding, three secondary winding, the iron core, the post oil switch, tapping switch and height, low pressure porcelain sleeve constitutes, one, the secondary winding connects into the self-coupling booster mode, leave enough oil duct clearance between iron core post and secondary winding internal diameter, the output lead sleeve pipe is high-pressure porcelain sleeve pipe, secondary winding head end output high voltage when bearing and stepping up, except increasing oil switch, other part structures are unanimous with ordinary three-phase power transformer, it can be ordinary three-phase power transformer with the change wiring mode.

Description

Three-phase transformer

The utility model relates to a kind of equipment that improves the terminal three-phase voltage of electric power system high pressure electric line.

At present to some apart from electric substation outlying villages and small towns and small-sized industrial and mining enterprises, owing to be in electric power system high pressure electric line end, produce and household electricity voltage fluctuation, decline comparatively serious, production and household electricity equipment can't normally be used, reduced power consumption equipment useful life, influenced that enterprise produces and life is normally carried out.The patent No. is 88200703.3, three-phase power Loading voltage regulator technology provides a kind of regulation voltage scope big, capaciously adjust the terminal three-phase voltage measure of electric power system high pressure electric line, it is serially connected between the main transformer and distribution bus of electric substation, use the three-phase power Loading voltage regulator theoretically and can guarantee the terminal rated supply voltage of electric power system high pressure electric line, but three-phase on load tap changer wherein and the required auxiliary equipment of three-phase power Loading voltage regulator have improved cost greatly, so can only be accepted use by electric substation, and for the outlying villages and small towns that are in electric power system high pressure electric line end and small-sized industrial and mining enterprises because three-phase power Loading voltage regulator and required auxiliary equipment cost height thereof, can not be accepted by them and use, and, the equipment of high cost like this, just often can not make common three-phase power distribution transformer usefulness in addition at voltage, can only leave unused causes waste.

The purpose of this utility model provides a kind of novel three-phase power transformer, be used to improve electric power system high pressure electric line terminal voltage,, be difficult for promoting the use of to overcome existing three-phase power Loading voltage regulator cost height, voltage just often can only leave unused, and causes the deficiency of wasting.

The technical solution of the utility model is: it is by shell, the device body, oil switch on the post, shunting switch and height, the low pressure porcelain bushing is formed, the device body is by three primary windings, three secondary coils and iron core are formed, shell one sidewall upper has the terminal line fairlead of three primary windings, other structure of shell is identical with common three-phase power transformer shell, the terminal line fairlead of three primary windings of closure head three phase mains incoming line fairlead and three phase mains output line fairlead and shell one sidewall upper internal diameter cooperates with the high voltage porcelain bushing external diameter of pipe respectively, closure head neutral line fairlead internal diameter cooperates with low pressure porcelain bushing external diameter, three primary winding head ends are connected with three secondary coil ends respectively, three primary winding ends are drawn respectively by the terminal line fairlead of three primary windings of shell one sidewall upper high voltage porcelain bushing pipe and are connected with three binding posts of oil switch one side on the post, three binding post short circuits of oil switch opposite side on the post, the three phase mains incoming line is respectively with one, secondary coil head, end is connected and is drawn by three phase mains incoming line fairlead high voltage porcelain bushing pipe, the three phase mains output line is connected with the secondary coil head end respectively by three phase mains output line fairlead high voltage porcelain bushing pipe draws, four taps are respectively arranged on three primary windings, there are three taps to be connected with the shunting switch binding post respectively, another tap is standby tap, the shunting switch screw is fixed on below the closure head, each primary winding is around admittedly outside corresponding secondary coil, one, layer insulation is arranged between secondary coil, oil duct gap and fastening oil duct bar, there is external insulation layer in the primary winding outside, cored post in each secondary coil, there is insulating board in the iron core column outside, oil duct gap and fastening oil duct bar are arranged between iron core column and secondary coil internal diameter, device is in shell, and the space is full of transformer oil between outer casing inner wall and device body.When not doing the time spent of boosting, can change into the general three-phase power transformer mode of connection and do power transmission and distribution three-phase power transformer usefulness.

The utility model is because three primary windings and three secondary coils are connected into self coupling stepup transformer mode, and between iron core column and secondary coil internal diameter, leave enough oil ducts gap, and be wound with the high pressure resistant insulation layer in the iron core outside, three phase mains output line lead-in wire sleeve design is the high voltage porcelain bushing pipe, can bear secondary coil head end output HIGH voltage when boosting, and except increasing the oil switch appurtenances, other modular construction is consistent with common three-phase power transformer, reduced cost, do not doing the time spent of boosting, change the three-phase power transformer usefulness that the mode of connection can be used as power transmission and distribution, reduce idle and waste that cause.

Fig. 1 is a kind of novel three-phase power transformer winding diagram

Fig. 2 is a kind of novel three-phase power transformer structural representation

Fig. 3 is a kind of novel three-phase power transformer vertical view

Fig. 4 is a kind of novel three-phase power transformer electric power system installation diagram

Provide most preferred embodiment of the present utility model below in conjunction with accompanying drawing: it is by shell, the device body, the post K switch 2 that oils, shunting switch 24 and height, low pressure porcelain bushing 22,26,27,25 form, the device body is by three primary windings 1, three secondary coils 3 and iron core 21 are formed, structure except that primary winding 1 has a standby tap 11 respectively with common three-phase power transformer height, low-voltage coil is identical with iron core, shell one sidewall upper has three primary windings, 1 terminal line 7 fairleads, other structure of shell is identical with common three-phase power transformer shell with material, closure head 23 three phase mains incoming lines, 2 fairleads and three phase mains output line 5 fairleads and three primary windings of shell one sidewall upper, 1 terminal X, Y, Z line fairlead internal diameter respectively with high voltage porcelain bushing pipe 22,26,27 external diameters cooperate, high voltage porcelain bushing pipe 22,26 is the outdoor high-voltage porcelain bushing, 27 is mining transformer high voltage porcelain bushing pipe, closure head 23 neutral lines 4 fairlead internal diameters cooperate with low pressure porcelain bushing 25 external diameters, low pressure porcelain bushing 25 is the outdoor low voltage porcelain bushing, three primary winding 1 head end A, B, C respectively with three secondary coils, 3 terminal a2, b2, c2 is connected, three primary winding 1 terminal X, Y, Z is drawn by three primary windings of shell one sidewall upper, 1 terminal line 7 fairlead high voltage porcelain bushing pipes 27, be connected with post three binding posts of K switch 2 one sides that oil respectively, post three the binding post short circuits of K switch 2 opposite sides that oil, post K switch 2 models that oil are DWP10-10 II type, three phase mains incoming line 2 is respectively with one, secondary coil 1,3 head, terminal A, B, C, a2, b2, c2 is connected and is drawn by three phase mains incoming line 2 fairlead high voltage porcelain bushing pipes 22, three phase mains output line 5 respectively with secondary coil 3 head end a, b, the c connection is drawn by three phase mains output line 5 fairlead high voltage porcelain bushing pipes 26, four taps 8 are respectively arranged on three primary windings 1,9,10,11, three taps 8 are arranged, 9,10 are connected with shunting switch 24 binding posts respectively, another tap 11 is standby tap, shunting switch 24 is fixed on below the closure head 23 for common three-phase power transformer shunting switch screw, each primary winding 1 is around consolidating in corresponding secondary coil 3 outsides, one, secondary coil 1,3 have two layers of insulation 15,16, two layers of insulation 15,16 have oil duct gap 14 and eight fastening oil duct bars 13, two layers of insulation 15,16 are the 1MM insulating board, oil duct gap 5MM-10MM, the oil duct bar is wooden, there is external insulation layer 12 in primary winding 1 outside, external insulation layer 12 is the 1MM insulating board, cored post 21 in each secondary coil 3, there are two layers of insulating board 17 in iron core column 21 outsides, 19, two layers of insulating board 17,19 have oil duct gap 18 and eight fastening oil duct bars 20, insulating board 17,19 specifications are 1MM, oil duct gap 18 is 2.5MM-50MM, device is in shell, and the space is full of transformer oil between outer casing inner wall and device body.During use transformer is serially connected in three-phase power transformer 6 primes, the post that when the terminal three-phase voltage of electric power system high pressure electric line is lower than rated voltage 10%, the closes K switch 2 that oils, the terminal three-phase voltage of electric power system high pressure electric line is through sending electric oil switch K1 to be added on the primary winding 1 by three phase mains incoming line 2, voltage after the raising is by secondary coil 3 head end a, b, c output, be added on 6 windings of back level three-phase power distribution transformer by three phase mains output line 5, when the terminal three-phase voltage of electric power system high pressure electric line is lower than rated voltage 15% when following, the standby tap 11 of primary winding is connected on post and oils on three binding posts of K switch 2 one sides, reach the purpose that improves electric power system high pressure electric line terminal voltage, this transformer amplitude of boosting is about 15%, according to actual needs, primary winding 1 also can be connected into the delta connection mode.When the terminal three-phase voltage of electric power system high pressure electric line just often, open the post K switch 2 that oils, withdraw from and boost, when automatic switching boosted, the interchangeable post K switch 2 that oils was autocontrol panel, reaches automatic switching and boosts.This transformer is not done the time spent of boosting, and can change the back panel wiring mode, does common three-phase power distribution transformer and uses.

Claims (4)

1, a kind of novel three-phase power transformer is by shell, the device body, oil switch on the post, shunting switch and height, the low pressure porcelain bushing is formed, the device body is by three primary windings, three secondary coils and iron core are formed, it is characterized in that: shell one sidewall upper has the terminal line fairlead of three primary windings, the terminal line fairlead of three primary windings of closure head three phase mains output line fairlead and shell one sidewall upper internal diameter cooperates with the high voltage porcelain bushing external diameter of pipe respectively, three primary winding head ends are connected with three secondary coil ends respectively, three primary winding ends are drawn respectively by the terminal line fairlead of three primary windings of shell one sidewall upper high voltage porcelain bushing pipe and are connected with three binding posts of oil switch one side on the post, three binding post short circuits of oil switch opposite side on the post, the three phase mains incoming line is respectively with one, secondary coil head, end is connected and is drawn by three phase mains incoming line fairlead high voltage porcelain bushing pipe, the three phase mains output line is connected with the secondary coil head end respectively, draw by three phase mains output line fairlead high voltage porcelain bushing pipe, a standby tap is respectively arranged on three primary windings, one, oil duct gap and fastening oil duct bar are arranged between secondary coil, there is insulating board in the iron core column outside, and oil duct gap and oil duct bar are arranged between iron core column and secondary coil internal diameter.

2, a kind of novel three-phase power transformer according to claim 1, it is characterized in that: the oil duct gap is 2.5MM-50MM between iron core column and secondary coil internal diameter.

3, a kind of novel three-phase power transformer according to claim 1, it is characterized in that: the oil duct gap is 5MM-10MM between first and second coil.

4, a kind of novel three-phase power transformer according to claim 1 is characterized in that: three the terminal line fairlead of primary winding inner high voltage porcelain bushings are mining transformer high voltage porcelain bushing pipe on shell one sidewall.

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