1. A single-phase ultra-large capacity strong current short-circuit test transformer, wherein the transformer comprises a transformer main body (1), a primary head end sleeve pipe (2), a primary neutral point sleeve pipe (3), a secondary head end sleeve pipe (4), a secondary middle A1 sleeve pipe (5), a secondary neutral point sleeve pipe (6), two oil conservators (7), an upper oil tank (9), a lower oil tank (8), a cooling apparatus (10) and a tapping switch (11), wherein two single-phase two-column-type iron cores (17) are disposed in the upper oil tank (9) and the lower oil tank (8); there are totally four iron core main columns; a coil sleeves the each iron core main column separately; the two oil conservators (7) are separately located above two sides of the long axis of the transformer main body (1); a connecting line between the centers of the two oil conservators is paralleled to the direction of the long axis of the transformer; the two oil conservators are hung on firewalls at the two sides of the long axis of the transformer; the cooling apparatuses (10) are concentrated and arranged at the outside of one side provided with the secondary head end sleeve pipe (4) and the secondary neutral point sleeve pipe (6) of the upper oil tank (9) and the lower oil tank (10) and are paralleled to the direction of the long axis of the transformer; the primary head end sleeve pipe (2) and the primary neutral point sleeve pipe (3), after being led out from a low-voltage leading wire, are connected to an external power grid; and multiple tapping switches (11) are separately located at high-voltage and low-voltage sides of the transformer main body (1).

2. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein the oil tank is in cover type; the secondary head end sleeve pipe (4), the secondary neutral A1 sleeve pipe (5) and the secondary neutral point sleeve pipe (6) are provided at the highvoltage side of the upper oil tank (9) and directly led out from the end of a secondary coil and the tapping switch (11); the led directions of the secondary head end sleeve pipe (4), the secondary neutral A1 sleeve pipe (5) and the secondary neutral point sleeve pipe (6) are all vertical to an inclined tank cover; the secondary head end sleeve pipe (2) and the primary neutral point sleeve pipe (3) are located on the low-voltage side of the upper oil tank (9); and 12 the primary head end sleeve pipe (2) and the primary neutral point sleeve pipe (3) are directly connected to a low-voltage leading wire led out from an output head of the low-voltage coil.

3. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein 4-8 tapping switches (11) are located at the high-voltage and the low-voltage sides of the transformer and output voltages in different levels through the different series-parallel connections of the tapping switch.

4. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein the coils of the four iron core main columns are connected with each other in parallel; the RI coil and RII coil in the four iron core main columns are in series connection or connected with each other in parallel, an external coil YI located at the outer part in the amplitude direction is led out in the amplitude direction; and the rest coils are led out at the upper and the lower ends.

5. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein the single-phase four-column structure consists of two iron core frames, four main columns, two upper yokes, two lower yokes and four lateral yokes constitute two separate transformer closed magnetic circuits.

6. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein the iron core is provided with an upper clamper, a lower clamper, an upper-clamper web, a lower-clamper web, an upper beam (13), a side beam (14), a foot pad (16), a middle upper beam (19), an iron core passing screw (21), a beam (23) and a middle connection bolt (24), all of which firmly connect the iron core into one rigid integral body.

7. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein The four output heads of the primary coil are parallelly led out to the external sleeve pipe and connected to the power grid.

8. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein the upper part of the transformer main body (1) is provided with an upper plate (32); a spring pressing pin(22) on the upper plate (32) is mounted in a limb plate of the clamper and comprises an oil tank (2206), an elastic part (2207), a positioning pin (2208), a pressing cover (2204), a pressing pin (2202) and a nut (2203); wherein the pressing pin (2202) is provided with the nut (2203), and connected to the limb plate (2201) of the upper clamper on the transformer. the lower section of the bolt of the pressing pin (2202) is pressed on the elastic part (2207) through the pressing cover (2204); the 13 above structure is mounted on the positioning pin (2208) which is in the oil tank (2206) and provided vertically to the bottom of the oil tank (2206).

9. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein the four iron core main columns of the two single-phase twocolumn- type iron cores (17) adopt a clamping device comprising the upper clampers (12) of columns I and II, the upper clampers (20) of columns III and IV, as well as the beam (23), wherein the upper clampers (12) of columns I and II are respectively a first high-voltage upper clamper and a first low-voltage upper clamper; the upper clampers (20) of columns III and IV are respectively a secondary high-voltage upper clamper and a secondary low-voltage upper clamper; the first high-voltage upper clamper is connected to the secondary highvoltage upper clamper through the beam (23); the first low-voltage upper clamper is connected to the secondary low-voltage upper clamper through the beam (23), and all of the upper clampers form a rigid integral clamper.

10. The transformer iron core clamping device according to claim 9, wherein the first high-voltage upper clamper and the secondary high-voltage upper clamper are firmly connected with each other through a plurality of fixed plates, and the first low-voltage upper clamper and the secondary low-voltage upper clamper are firmly connected with each other through a plurality of the fixed plates.

11. The transformer iron core clamping device according to claim 9, wherein the two ends of the beam (23) are connection plates which are provided in parallel and connected with each other through a middle reinforced plate; the middle reinforced plate is a groove-steelshaped structure which is provided between the two connection plates, oppositely and in parallel and has a space.

12. The transformer iron core clamping device according to claim 9, wherein a lamination of the iron core is provided with a hole which may be passed through the iron core passing screw (21); a mounting hole of the iron core passing screw (21) is provided at the opposite place of each the clamper; and the iron core passing screw (21) is mounted on the iron core and then may firmly clamp the iron core.

13. The single-phase ultra-large capacity strong current short-circuit test transformer according to claim 1, wherein the transformer main body (1) is provided with an integrally mounted pedestal (28) and connected with a base through an insulated pad plate (31), an insulated pad ring (30) and an insulated bolt (29).

FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
1. ' SINGLE-PHASE ULTRA-LARGE CAPACITY STRONG CURRENT SHORT-CIRCUIT TEST TRANSFORMER '
2.
1. (A) TBEA SHENYANG TRANSFORMER GROUP CO., LTD
(B) China
(C) No.32 Development Avenue, Shenyang Economic and Technological
Development District Shenyang, Liaoning 110144, China
The following specification particularly describes the invention and the manner in which
it is to be performed.
2
FIELD OF THE INVENTION
The invention relates to a current short-circuit test transformer in the technical field of
transformer manufacturing and specifically, a single-phase ultra-large capacity strong
current short-circuit test transformer used for a strong current test station.
BACKGROUND OF THE INVENTION
The short-circuit strength of a transformer is a key indicator to ensure the
reliability of the transformer. With the gradual development of China’s power industry,
the level and capacity of the voltage of the transformer is increased. When a system is
running, as there are various causal factors, it is not possible to completely eliminate the
occurrence of short-circuit fault. The transformer inevitably bears the impact caused by
the short circuit of the power grid. When subjected to instantaneous short circuit, the
transformer will generate big mechanical force therein. If a transformer manufacturer
wants to ensure that the transformer may withstand the impact caused by a shortcircuit
fault stipulated by a standard, the transformer shall be designed and
manufactured to possess the capacity resisting the short circuit and required by a
power grid. The ultra-large capacity strong current short-circuit test transformer, taken as an
intermediate transformer used for large-capacity high-voltage transformer during a short
circuit test, is applied for a strong current test station. However, currently, it has not been
reported of the single-phase ultra-large capacity strong current short-circuit test transformer
with such performance.
SUMMARY OF THE INVENTION
In order to overcome the disadvantage that a large capacity high-voltage transformer in
the prior art taken as an intermediate transformer during a short-circuit test has not been
reported, the invention provides a single-phase ultra-large capacity strong current short-circuit
test transformer which may be safe and reliable to frequently bear a short circuit impact.
The invention adopts the following technical proposal to solve the above technical
problem:
A single-phase ultra-large capacity strong current short-circuit test transformer in the
invention comprises a transformer main body, a primary head end sleeve pipe, a primary
neutral point sleeve pipe, a secondary head end sleeve pipe, a secondary middle A1 sleeve
pipe, a secondary neutral point sleeve pipe, two oil conservators, an upper oil tank, a lower oil
tank, a cooling apparatus and a tapping switch, wherein two single-phase two-column-type
3
iron cores are disposed in the upper oil tank and the lower oil tank; there are totally four iron
core main columns; a coil sleeves the each iron core main column separately; the two oil
conservators are separately located above two sides of the long axis of the transformer main
body; a connecting line between the centers of the two oil conservators is paralleled to the
direction of the long axis of the transformer; the two oil conservators are hung on firewalls at
the two sides of the long axis of the transformer; the cooling apparatuses are concentrated and
arranged at the outside of one side provided with the secondary head end sleeve pipe and the
secondary neutral point sleeve pipe of the upper oil tank and the lower oil tank and are
paralleled to the direction of the long axis of the transformer; the primary head end sleeve
pipe and the primary neutral point sleeve pipe, after being led out from a low-voltage leading
wire, are connected to an external power grid; multiple tapping switches are separately
located at high-voltage and low-voltage sides of the transformer main body. The oil tank is in
cover type; the secondary head end sleeve pipe, the secondary neutral A1 sleeve pipe and the
secondary neutral point sleeve pipe are provided at the high-voltage side of the upper oil tank
and directly led out from the end of a secondary coil and the tapping switch; the led directions
of the secondary head end sleeve pipe, the secondary neutral A1 sleeve pipe and the
secondary neutral point sleeve pipe are all vertical to an inclined tank cover; the primary head
end sleeve pipe and the primary neutral point sleeve pipe are located on the low-voltage side
of the upper oil tank; the primary head end sleeve pipe and the primary neutral point sleeve
pipe are directly connected to a low-voltage leading wire led out from the low-voltage coil.
4-8 tapping switches are located at the high-voltage and the low-voltage sides of the
transformer and output voltages in different levels through the different series-parallel
connections of the tapping switch.
The coils of the four iron core main columns are connected with each other in parallel;
The RI coil and RII coil in the four iron core main columns are in series connection or
connected with each other in parallel. An external coil YI located at the outer part in the
amplitude direction is led out in the amplitude direction; and the rest coils are led out at the
upper and the lower ends. The single-phase four-column structure consists of two iron core
frames. Four main columns, two upper yokes, two lower yokes and four lateral yokes
constitute two separate transformer closed magnetic circuits. the iron core is provided with an
upper clamper, a lower clamper, an upper-clamper web, a lower-clamper web, an upper beam,
a side beam, a foot pad, a middle upper beam, an iron core passing screw, a beam and a
middle connection bolt, all of which firmly connect the iron core into one rigid integral body.
The four output heads of the primary coil are parallelly led out to the external sleeve pipe and
connected to the power grid. the upper part of the transformer main body is provided with an
4
upper plate; a spring pressing pinon the upper plate is mounted in a limb plate of the clamper
and comprises an oil tank, an elastic part, a positioning pin, a pressing cover, a pressing pin
and a nut; wherein the pressing pin is provided with the nut, and connected to the limb plate
of the upper clamper on the transformer. the lower section of the bolt of the pressing pin is
pressed on the elastic part through the pressing cover; and the above structure is mounted on
the positioning pin which is in the oil tank and provided vertically to the bottom of the oil
tank.
the four iron core main columns of the two single-phase two-column-type iron cores
adopt a clamping device comprising the upper clampers of columns I and II, the upper
clampers of columns III and IV, as well as the beam, wherein the upper clampers of columns I
and II are respectively a first high-voltage upper clamper and a first low-voltage upper
clamper; the upper clampers of columns III and IV are respectively a secondary high-voltage
upper clamper and a secondary low-voltage upper clamper; the first high-voltage upper
clamper is connected to the secondary high-voltage upper clamper through the beam; the first
low-voltage upper clamper is connected to the secondary low-voltage upper clamper through
the beam, and all of the upper clampers form a rigid integral clamper.
the first high-voltage upper clamper and the secondary high-voltage upper clamper are
firmly connected with each other through a plurality of fixed plates, and the first low-voltage
upper clamper and the secondary low-voltage upper clamper are firmly connected with each
other through a plurality of the fixed plates.
the two ends of the beam are connection plates which are provided in parallel and
connected with each other through a middle reinforced plate; the middle reinforced plate is a
groove-steel-shaped structure which is provided between the two connection plates,
oppositely and in parallel and has a space.
A lamination of the iron core is provided with a hole which may be passed through the
iron core passing screw; a mounting hole of the iron core passing screw is provided at the
opposite place of each the clamper; and the iron core passing screw is mounted on the iron
core and then may firmly clamp the iron core.
The transformer main body is provided with a pedestal and connected with a base
through an insulated pad plate, an insulated pad ring and an insulated bolt.
The invention has the following advantages:
1. With multiple tapping switches and different series-parallel connections, the
invention realizes secondary side and provides voltage output of multiple voltage levels. A
5
primary (220kV low voltage) sleeve pipe, a neutral point sleeve pipe, a middle sleeve pipe
and two secondary (high voltage) sleeve pipes are all vertical to a cover of an inclined tank
and led out. The oil conservator is hung on firewalls at the two sides in the long axis of a
transformer, thus fully meeting the requirements of external insulation distance while
facilitating the supporting structure of the oil conservator to meet the mounting
requirements on site.
2. The invention adopts multiple tapping switches respectively arranged among four
column coils, thus obtaining convenient wire leading and wire connection, achieving
reasonable places, fully utilizing the space within the oil tank, as well as reducing the size
of the oil tank and floor space.
3. The invention uses a through-core screw in large size for an iron clamping
structure, thus guaranteeing the stability of the iron core during sudden short circuit. A
lower-clamper web is an integral structure and has good rigidity. An upper-clamper web is
in split type, thus conveniently operating the assembly of the iron core. With an upper
beam and the iron core screw, the upper clamper becomes a firm integral body, thus
ensuring the rigidity of the upper clamper and possessing simple structure and
arrangement.
4. A body pressing device of the invention uses a spring pressing pin structure which
is an insulation key part of the body. As the transformer needs to frequently bear shortcircuit
impact, reliable compaction shall be ensured in the axis direction all the time. The
general pressing pin may not be effectively pressed when the axial direction of the body
varies. After a spring pressing pin is adopted, with the action of a disc-shaped spring, the
body may be ensured to be effectively pressed, regardless of how the axial direction of the
body varies.
5. The invention provides test and verification for the transformer with the capacity
resisting the short circuit, is an ultra-large capacity strong current short-circuit test
transformer and provides strong technical support for greatly developing the safe and
reliable high-voltage large-capacity power grid and ensuring the safe and reliable operation
of the power grid.
6.The successful development of the invention, and the major breakthroughs in a
single-phase ultra-large capacity strong current sudden short-circuit test transformer coil,
the capacity of a body resisting the short circuit, multiple-voltage output and other aspects
may boost the industry development of a domestic short-circuit test transformer, meet the
requirements of our country’s strong and safe grid construction.
6
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a main view of a transformer according to the invention;
Figure 2 is a left view of Figure 1;
Figure 3 is a top view of Figure 1;
Figure 4 is a structural diagram of an iron core, an upper clamper and a lower clamper
according to the invention;
Figure 5 is a left view of Figure 4;
Figure 6 is a partial enlarged diagram of V part in Figure 5;
Figure 7 is a top view of Figure 4;
Figure 8 is a structural diagram of the connection of a beam of an upper clamper of an
iron core and the arrangement of a spring pressing pin;
Figure 9 is a structure diagram of a spring pressing pin;
Figure 10 is a principle diagram of a connection wire according to the invention;
Figure 11 is a diagram of the connection of a leading wire;
Figure 12 is a diagram of the connection between a leading wire and a sleeve pipe;
Figure 13 is a diagram of the mounting of a middle upper beam;
Figure 14 is a structural diagram of a middle beam;
Figure 15 is a structural diagram of a middle upper beam;
Figure 16 is a diagram of the assembly of an integral body of an end insulation; and
Figure 17 is a diagram of the fixture of an integrally mounted pedestal.
wherein, 1: Transformer Main Body; 2: Primary Head End Sleeve Pipe; 3: Primary
Neutral Point Sleeve Pipe; 4: Secondary Head End Sleeve Pipe; 5: Secondary Neutral A1
Sleeve Pipe; 6: Secondary Neutral Point Sleeve Pipe; 7: Oil Conservator; 8: Lower Oil
Conservator; 9: Upper Conservator; 10: Cooling Device; 11: Tapping Switch;12: Upper Clamper
Of Columns I And II; 13: Upper Beam; 14: Side Beam; 15: Lower Clamper; 16: Foot Pad; 17:
Iron Core; 18: Lifting Lug Of Clamper 19: Middle Upper Beam; 20: Upper Clampers Of Columns
III And IV； 21: Iron Core Passing Screw; 22: Spring Pressing Pin; 23: Beam; 24: Middle
Connection Screw; 25: End Insulation; 26: Contra-Angle Ring; 27: Positive Angle Ring; 28:
Integrally Mounted Pedestal; 29: Bolt; 30: Insulated Pad Ring; 31: Insulated Pad Plate; 32: Upper
7
Plate;2201: Limb Plate Of Upper Clamper; 2202: Pressing Pin; 2203: Nut; 2204: Pressing Cover;
2205: Pin; 2206: Oil Tank; 2207: Dish-Shaped Spring; 2208: Positioning Pin
DETAILED DESCRIPTION OF THE EMBODIMENTS
The invention is further described with the combination of description and drawings:
The transformer of the invention is an ultra-large capacity strong current short-circuit
test conformer used for testing its capacity resisting short circuit.
As shown in figures 1-3, a single-phase ultra-large capacity strong current short-circuit
test transformer in the invention comprises a transformer main body 1, a primary head end
sleeve pipe 2, a primary neutral point sleeve pipe 3, a secondary head end sleeve pipe 4, a
secondary middle A1 sleeve pipe 5, a secondary neutral point sleeve pipe 6, two oil
conservators 7, an upper oil tank 8, a lower oil tank 9, a cooling apparatus 10 and a tapping
switch 11, wherein two single-phase two-column-type (in the shape of double Chinese
characters of “Kou”) iron cores are disposed in the upper oil tank 9 and the lower oil tank 8;
there are totally four iron core main columns; Each iron core main column is respectively
sleeved with an RII coil, a YII coil, an RI coil, and a YI coil; YⅠ and YⅡ coils are in a series
connection; The RI coil and the RII coil are in a series connection. An external coil is led out
in the amplitude direction, and the rest coils are all led out at the upper and the lower ends and
led into with a sleeve pipe through a cable. Two oil conservators 7 are respectively located on
the two sides in the long axial direction of the transformer body 1 and hung on the wall body
of two firewalls.
The oil tank is in cover type; The secondary sleeve is located at the high-voltage side of the
upper oil tank 9 and directly led out from the end of the secondary coil and the tapping switch
11(1#). The leading direction of the secondary sleeve and the plumb line form the angle of 30° and
the leading direction is vertical to an inclined tank cover; The secondary neutral point sleeve pipe 6
is located at the high-voltage side, forms the angle of 30° with the plumb line and is led out. The
primary sleeve pipe is located at the low-voltage side of the upper oil tank 9 and directly connected
with the low-voltage leading wire led out from the output head of the low-voltage coil.
The cooling apparatuses 10 are concentrated and arranged at the high-voltage side. That
is, they are concentrated and arranged at the outside of one side provided with the secondary
head end sleeve pipe 4 and the secondary neutral point sleeve pipe 6 of the upper oil tank 9
and the lower oil tank 8 and are paralleled to the direction of the long axis of the transformer,
thus saving the mounting space under the premise that the cooling effect is guaranteed.
8
As shown in Figures 11 and 12, the primary head end sleeve pipe 2 and the primary
neutral point sleeve pipe 3, after being led out from a low-voltage leading wire, are connected
to an overhead line of an external power grid. The secondary head end sleeve pipe 4 and the
secondary neutral point sleeve pipe 6, after led out from the high-voltage leading wire,
provide power. As shown in Figure 10, the YⅠ coil and the YⅡ coil of the four iron core main
columns are connected with each other in parallel. The RI coil and the RII coil are in a series
connection. The external coil is led out in the amplitude direction. The rest coils are all led out
at the upper and the lower ends and led into with the sleeve pipe through a cable.
As shown in Figure 11, the tapping switch 11 in the example adopts a large brushless
excitation tapping switch, which is respectively located at the high-voltage side and the lowvoltage
side of the transformer. Each side has four tapping switches, and there are totally eight
tapping switches. The eight tapping switches are in different parallel connections to realize 36
kinds of different output voltages.
As shown in Figures 4-7, two single-phase two-column-type iron cores 17 are a singlephase
four-column structure and consist of two iron cores in shape of Chinese character of
“Kou”. Four main columns, two upper yokes and two lower yokes constitute two single-frame
transformer closed magnetic circuits. The above single-phase four-column structure adopts a
clamping device comprising upper clampers 12 of columns I and II, clampers 20 of columns
III and IV and a beam 23 (see figure 14), wherein the upper clampers 12 of columns I and II
are respectively a first high-voltage upper clamper and a first low-voltage upper clamper; the
upper clampers 20 of columns III and IV are respectively a secondary high-voltage upper
clamper and a secondary low-voltage upper clamper; the first high-voltage upper clamper is
connected to the secondary high-voltage upper clamper through the beam 23; the first lowvoltage
upper clamper is connected to the secondary low-voltage upper clamper through the
beam 23, and all of the upper clampers form a rigid integral clamper. the first high-voltage
upper clamper and the secondary high-voltage upper clamper are firmly connected with each
other through a plurality of fixed plates, and the first low-voltage upper clamper and the
secondary low-voltage upper clamper are firmly connected with each other through a plurality
of the fixed plates. the two ends of the beam 23 are connection plates which are provided in
parallel and connected with each other through a middle reinforced plate; the middle
reinforced plate is a groove-steel-shaped structure which is provided between the two
connection plates, oppositely and in parallel and has a space. a lamination of the iron core is
provided with a hole which may be passed through the iron core passing screw 21; a
mounting hole of the iron core passing screw 21 is provided at the opposite place of each the
9
clamper; and the iron core passing screw 21 is mounted on the iron core 17 and then may
firmly clamp the iron core 17.
In the example, the iron core main column is provided with upper clamper 12 of columns
I and II, a lower clamper 15, upper clampers 20 of columns III and IV, an upper-clamper web,
a lower-clamper web, an upper beam 13, a side beam 14, a foot pad 16, a middle upper beam
19, an iron core passing screw 21, a beam 23 and a middle connection bolt 24 (as shown in
Figure 13).One upper clamper web is respectively arranged at the clampers at the highvoltage
side and the low-voltage side of each single-frame iron core. The divided clamper is
fixed into one steel integral body through the beam 23 and an iron core pulling plate. The
lower clamper 15 is an integral structure to ensure an iron core piece to be clamped, ensure a
body to be hung (through a plurality of lifting lugs of the clamper provided at the upper
clamper), and ensure the mechanical strength under the pressing and short-circuit state.
The iron core 17 is provided with an upper clamper, a lower clamper, an upper-clamper
web, a lower-clamper web, an upper beam 13, a side beam 14, a foot pad 16, a middle upper
beam 19 (see Figure 15), an iron core passing screw 21, a beam 23 and a middle connection
bolt 24, all of which firmly connect the iron core 17 into one rigid integral body.
As shown in Figures 8 and 9, the upper part of the transformer body 1 is provided with a
body pressing plate (that is, the upper pressing plate 32). A spring pressing pin 22 on the
upper pressing plate 32 is mounted on a limb plate of the clamper, pressed on the upper
pressing plate 32 and effectively and firmly presses the body all the time. The spring pressing
pin 22 comprises an oil tank 2206, an elastic part 2207, a positioning pin 2208, a pressing
cover 2204, a pressing pin 2202 and a nut 2203, wherein the pressing pin 2202 is provided
with the nut 2203, and connected to the limb plate 2201 of the upper clamper on the
transformer. The lower section of the bolt of the pressing pin 2202 is pressed on the elastic
part through the pressing cover 2204; The above structures are mounted on the positioning pin
2208 in the oil tank 2206. The poisoning pin 2208 is in the oil tank 2206 and provided
vertically to the bottom of the oil tank 2206. In the example, the elastic part adopts a dishshaped
spring 2207. The bottom of the oil tank 2207 is provided with a pad of the pressing
pin.
The spring pressing pin 22 in the coil of the transformer, or an insulated piece in the end
insulation and the pad may still effectively and firmly press the coil of the transformer after
they are shrunk. When the transformer generates a large axial force because of sudden short
circuit, they still may provide pressing force, thus preventing the coil of the transformer from
10
being moved in the axial direction, guaranteeing the safe normal operation of the transformer
and improving the capacity resisting the short circuit.
The structure form of the leading wire is that a cable and a special connection head are
connected with multiple tapping switches 11. With the connection, a secondary coil may be in
a series connection and in parallel connection or in series-parallel connections, thus
constituting many different voltage levels. In the example, eight tapping switches are adopted,
thus constituting 36 different voltage levels.
Figure 16 is a diagram of the assembly of an integral body of an end insulation The main
body 1 of the transformer is that the end insulation 25 in the body is divided into eight end
insulations to be assembled and integrally pressed. An end coil is dried, pressed and treated
for many times. The pressed force shall guarantee the height required by the design.
The pad of each layer of end insulation shall be aligned and their openings shall be in the
same direction, thus ensuring the balance of the height and the concentricity of the end
insulation. The positive angle ring 27 and the contra-angle ring 26 of an end are used for
improving the insulation level of the end, thus decreasing the distance of the end insulation
and the creepage distance of the end.
Figure 17 is a diagram of the fixture of an integrally mounted pedestal. With the
integrally mounted pedestal 28, the insulated pad plate 31, the insulated pad 30 and the
insulated bolt 29, the integrally mounted pedestal 28 is separated from the transformer main
body 1 and connected with the integrally mounted pedestal 28. And then the transformer main
body 1 may be connected to the ground through a grounded copper bar via a grounded base
on the wall of the oil tank.
11
We Claim:-
1. A single-phase ultra-large capacity strong current short-circuit test transformer,
wherein the transformer comprises a transformer main body (1), a primary head end sleeve
pipe (2), a primary neutral point sleeve pipe (3), a secondary head end sleeve pipe (4), a
secondary middle A1 sleeve pipe (5), a secondary neutral point sleeve pipe (6), two oil
conservators (7), an upper oil tank (9), a lower oil tank (8), a cooling apparatus (10) and a
tapping switch (11), wherein
two single-phase two-column-type iron cores (17) are disposed in the upper oil tank (9)
and the lower oil tank (8); there are totally four iron core main columns; a coil sleeves the
each iron core main column separately;
the two oil conservators (7) are separately located above two sides of the long axis of the
transformer main body (1); a connecting line between the centers of the two oil conservators
is paralleled to the direction of the long axis of the transformer; the two oil conservators are
hung on firewalls at the two sides of the long axis of the transformer;
the cooling apparatuses (10) are concentrated and arranged at the outside of one side
provided with the secondary head end sleeve pipe (4) and the secondary neutral point sleeve
pipe (6) of the upper oil tank (9) and the lower oil tank (10) and are paralleled to the direction
of the long axis of the transformer;
the primary head end sleeve pipe (2) and the primary neutral point sleeve pipe (3), after
being led out from a low-voltage leading wire, are connected to an external power grid; and
multiple tapping switches (11) are separately located at high-voltage and low-voltage
sides of the transformer main body (1).
2. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein
the oil tank is in cover type; the secondary head end sleeve pipe (4), the secondary neutral
A1 sleeve pipe (5) and the secondary neutral point sleeve pipe (6) are provided at the highvoltage
side of the upper oil tank (9) and directly led out from the end of a secondary coil and
the tapping switch (11); the led directions of the secondary head end sleeve pipe (4), the
secondary neutral A1 sleeve pipe (5) and the secondary neutral point sleeve pipe (6) are all
vertical to an inclined tank cover; the secondary head end sleeve pipe (2) and the primary
neutral point sleeve pipe (3) are located on the low-voltage side of the upper oil tank (9); and
12
the primary head end sleeve pipe (2) and the primary neutral point sleeve pipe (3) are directly
connected to a low-voltage leading wire led out from an output head of the low-voltage coil.
3. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein 4-8 tapping switches (11) are located at the high-voltage and
the low-voltage sides of the transformer and output voltages in different levels through the
different series-parallel connections of the tapping switch.
4. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein the coils of the four iron core main columns are connected with
each other in parallel; the RI coil and RII coil in the four iron core main columns are in series
connection or connected with each other in parallel, an external coil YI located at the outer
part in the amplitude direction is led out in the amplitude direction; and the rest coils are led
out at the upper and the lower ends.
5. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein the single-phase four-column structure consists of two iron core
frames, four main columns, two upper yokes, two lower yokes and four lateral yokes
constitute two separate transformer closed magnetic circuits.
6. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein the iron core is provided with an upper clamper, a lower
clamper, an upper-clamper web, a lower-clamper web, an upper beam (13), a side beam (14),
a foot pad (16), a middle upper beam (19), an iron core passing screw (21), a beam (23) and a
middle connection bolt (24), all of which firmly connect the iron core into one rigid integral
body.
7. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein The four output heads of the primary coil are parallelly led out
to the external sleeve pipe and connected to the power grid.
8. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein the upper part of the transformer main body (1) is provided
with an upper plate (32); a spring pressing pin(22) on the upper plate (32) is mounted in a
limb plate of the clamper and comprises an oil tank (2206), an elastic part (2207), a
positioning pin (2208), a pressing cover (2204), a pressing pin (2202) and a nut (2203);
wherein the pressing pin (2202) is provided with the nut (2203), and connected to the limb
plate (2201) of the upper clamper on the transformer. the lower section of the bolt of the
pressing pin (2202) is pressed on the elastic part (2207) through the pressing cover (2204); the
13
above structure is mounted on the positioning pin (2208) which is in the oil tank (2206) and
provided vertically to the bottom of the oil tank (2206).
9. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein the four iron core main columns of the two single-phase twocolumn-
type iron cores (17) adopt a clamping device comprising the upper clampers (12) of
columns I and II, the upper clampers (20) of columns III and IV, as well as the beam (23),
wherein the upper clampers (12) of columns I and II are respectively a first high-voltage
upper clamper and a first low-voltage upper clamper; the upper clampers (20) of columns III
and IV are respectively a secondary high-voltage upper clamper and a secondary low-voltage
upper clamper; the first high-voltage upper clamper is connected to the secondary highvoltage
upper clamper through the beam (23); the first low-voltage upper clamper is
connected to the secondary low-voltage upper clamper through the beam (23), and all of the
upper clampers form a rigid integral clamper.
10. The transformer iron core clamping device according to claim 9, wherein the first
high-voltage upper clamper and the secondary high-voltage upper clamper are firmly
connected with each other through a plurality of fixed plates, and the first low-voltage upper
clamper and the secondary low-voltage upper clamper are firmly connected with each other
through a plurality of the fixed plates.
11. The transformer iron core clamping device according to claim 9, wherein the two
ends of the beam (23) are connection plates which are provided in parallel and connected with
each other through a middle reinforced plate; the middle reinforced plate is a groove-steelshaped
structure which is provided between the two connection plates, oppositely and in
parallel and has a space.
12. The transformer iron core clamping device according to claim 9, wherein a
lamination of the iron core is provided with a hole which may be passed through the iron core
passing screw (21); a mounting hole of the iron core passing screw (21) is provided at the
opposite place of each the clamper; and the iron core passing screw (21) is mounted on the
iron core and then may firmly clamp the iron core.
13. The single-phase ultra-large capacity strong current short-circuit test transformer
according to claim 1, wherein the transformer main body (1) is provided with an integrally
mounted pedestal (28) and connected with a base through an insulated pad plate (31), an
insulated pad ring (30) and an insulated bolt (29).