CN115312286A - A protection device for grid voltage transformer below 35KV - Google Patents

Abstract

The application belongs to the technical field of voltage equipment protection devices and discloses protection equipment for a power grid voltage transformer below 35 KV. The transformer comprises a bottom plate, wherein a first protective cover is arranged at the top end of the bottom plate, a second protective cover is arranged inside the first protective cover, a voltage transformer body is arranged inside the second protective cover, and a base is arranged at the bottom end of the voltage transformer body; notches are symmetrically formed in the inner walls of the two sides of the base, moving and fixing assemblies are arranged inside the two notches, and each moving and fixing assembly comprises a connecting rod, an L-shaped plate and a return spring; the gear linkage assembly comprises a first gear, a threaded rod, a second gear, a rotating rod, a fixing frame and a driving mechanism; the driving mechanism comprises a turbine and a worm, a first protective cover and a second protective cover are arranged, and the voltage transformer can be protected, so that the voltage transformer is prevented from being damaged due to external influence, and the practical effect of protecting equipment is improved.

Description

A protection device for a voltage transformer of a power grid below 35KV

technical field

The present application relates to the technical field of voltage equipment protection devices, and more specifically, relates to a protection device for a voltage transformer of a power grid below 35KV.

Background technique

A voltage transformer is similar to a transformer and is an instrument used to transform voltage. However, the purpose of transforming the voltage of the transformer is to facilitate the transmission of electric energy, so the capacity is very large, and it is generally calculated in kilovolt-ampere or megavolt-ampere; The power supply of the protection device is used to measure the voltage, power and electric energy of the line, or to protect the valuable equipment, motor and transformer in the line when the line fails. Therefore, the capacity of the voltage transformer is very small, generally only a few volts, Dozens of VA, the maximum is no more than 1000 VA.

When the voltage transformers on the market are installed, they are often installed outdoors, and most of the voltage transformers are exposed outside as a whole, which is extremely vulnerable to the influence of the external environment. In harsh environments, if the protection measures are not good enough, the voltage transformers The performance of the transformer is easy to decline, especially in rainy and snowy weather, which may cause the voltage transformer to fail or lead to circuit breakage in advance, resulting in damage. Therefore, a protection device for power grid voltage transformers below 35KV is proposed.

Contents of the invention

In order to solve the above problems, the present application provides a protection device for a voltage transformer of a power grid below 35KV.

The protection equipment for a power grid voltage transformer below 35KV provided by this application adopts the following technical scheme:

A protection device for a power grid voltage transformer below 35KV, comprising a base plate, the four corners of the bottom end of the base plate are fixedly connected with supporting legs, the top end of the base plate is provided with a first protective cover, and the top end of the first protective cover is A top cover is provided, a rectangular hole is opened at the top of the top cover, a second protective cover is provided inside the first protective cover, the outer wall of the second protective cover is slidingly inserted and connected with the inner wall of the top cover, and the The inside of the second protective cover is provided with a voltage transformer body, and the bottom end of the voltage transformer body is provided with a base;

The inner walls on both sides of the base are symmetrically provided with notches, and the inside of the two notches are equipped with mobile and fixed components. The mobile and fixed components include connecting rods, L-shaped plates, and return springs. The second protective cover The inner wall of the bottom is symmetrically provided with a socket matching one end of the L-shaped plate, and the opposite ends of the two L-shaped plates are respectively slid and connected to the inside of the two sockets;

The inside of the bottom plate is provided with a gear groove, and the inside of the gear groove is provided with a gear linkage assembly. The top outer wall of the threaded rod is provided with threads;

The drive mechanism includes a worm gear and a worm, and the rod walls at both ends of the worm are provided with threads suitable for the two worm gears, one end of the worm is rotatably connected to the back inner wall of the bottom plate, and the other end of the worm extends to the front of the bottom plate, and is fixedly connected with an adjustment knob.

Further, the bottom ends of the plurality of threaded rods are respectively rotatably connected to the bottom inner wall of the bottom plate, two fixing blocks are fixedly connected to both sides of the base, and threaded holes are provided inside the plurality of fixing blocks. The top ends of the plurality of threaded rods extend to the top end of the bottom plate, and are respectively connected to the interiors of the plurality of fixed blocks in rotation.

Through the above technical solution, a threaded rod and a fixed block are provided, and the threaded rod drives the base and the second protective cover to move up and down through the fixed block during the rotation process.

Further, the plurality of first gears are sleeved on the bottoms of the plurality of threaded rods respectively, the outer walls of the plurality of first gears are respectively meshed with the outer walls of the plurality of second gears, and the plurality of second gears are opposite to each other. One side of the two rotating rods is respectively fixedly connected to the two ends.

Through the above technical solution, the first gear is provided, and the second gear drives the threaded rod to rotate when the second gear is rotating.

Further, a plurality of the fixing frames are symmetrically sleeved on the rod walls at both ends of the two rotating rods, and the top and bottom ends of the plurality of fixing frames are respectively fixedly connected to the inner wall of the bottom plate.

Through the above technical solution, by providing a rotating rod for connecting multiple second gears, multiple connecting structures are connected as a whole, so that multiple threaded rods can rotate synchronously.

Further, the two worm gears are respectively sleeved on the middle outer walls of the two rotating rods, and the rod walls at both ends of the worm are provided with threads suitable for the worm gears, and the outer walls of the two worm gears are respectively connected to the worm screw The arms are threadedly engaged at both ends.

Through the above technical solution, by setting the turbine and the worm, multiple joint adjustment controls can be completed.

Further, the rod wall at the opposite end of the two connecting rods is slidably connected with the two sides of the base, and the opposite ends of the two connecting rods are respectively fixedly connected with the bottom of the opposite side of the two L-shaped plates. The top outer wall of the L-shaped plate is respectively slidably connected with the top of the base.

Through the above technical solution, the L-shaped plate is used for fixed installation of the second protective cover.

Further, the bottoms of the opposite sides of the two L-shaped plates are respectively fixedly connected to the opposite ends of the two return springs, and the opposite ends of the two return springs are respectively fixedly connected to the inner walls of the base, and the top ends of the base are fixed A placement board is connected, and the top of the placement board is fixedly connected with the bottom end of the voltage transformer body.

Through the above technical solution, a return spring is provided, and the characteristics of the return spring are used to drive the L-shaped plate to spread and move outward without external force.

Further, the top ends of the plurality of threaded rods are respectively rotatably connected to the bottom end of the top cover, trapezoidal blocks are fixedly connected to the top inner walls of both sides of the first protective cover, and both sides of the second protective cover are symmetrically opened. There are cooling holes, and one side of the first protective cover is fixedly connected with the housing.

Through the above technical solution, by setting the trapezoidal block, the connecting rod can also be squeezed when sliding along the surface of the trapezoidal block.

Further, a bracket is fixedly connected to one side of the casing, a cooling fan is arranged inside the casing, and a rotating shaft is fixedly sleeved inside the cooling fan.

Through the above technical solution, a heat dissipation fan is provided to ventilate and dissipate heat inside the protective cover.

Further, connecting pieces are fixedly installed on both sides of the first protective cover, the bottom ends of the plurality of connecting pieces are respectively fixedly installed at the four corners of the top of the bottom plate, and the top ends of the plurality of connecting pieces are screwed with Bolts, gaskets are sheathed on the tops of the plurality of bolts.

Through the above technical solution, the first protective cover is fixed on the top end of the bottom plate by setting the connecting piece and the bolt.

In summary, the present application includes at least one of the following beneficial technical effects:

(1) In this invention, a first protective cover and a second protective cover are arranged outside the voltage transformer, and the two sets of outer covers are combined to protect the voltage transformer, thereby preventing the voltage transformer from being affected by external factors. damage, avoid performance degradation, and improve the practical effect of protective equipment;

(2) In this invention, a mobile fixing assembly is provided, through the extrusion between the connecting rod and the trapezoidal block, the connecting rod is moved to the inside of the base, and then the L-shaped plate is separated from the bottom of the second protective cover, so that the second protective cover can be separated. The second protective cover is removed to facilitate the maintenance and replacement of the voltage transformer body in the later stage;

(3) In this invention, the gear linkage assembly is designed. The rotating adjustment knob drives the turbine to rotate through the worm, and then drives the threaded rod to rotate through the mutual cooperation between the rotating rod, the second gear and the first gear, so that the base drives the first gear. The second protective cover is raised and lowered, and then the mobile and fixed components are operated. In this way, multiple adjustment controls can be completed through a set of controls. When using this device, the device can be flexibly adjusted according to the environment and conditions of use. The device is more convenient to use.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present application;

Fig. 2 is the enlarged schematic view of the structure at A in Fig. 1 of the present application;

Fig. 3 is the enlarged schematic diagram of the structure at B in Fig. 1 of the present application;

Fig. 4 is the front view sectional structure schematic diagram of the present application;

Fig. 5 is the enlarged schematic view of the structure at C in Fig. 4 of the present application

Fig. 6 is a top view sectional structural schematic diagram of the present application;

FIG. 7 is a schematic diagram of a right-side cross-sectional structure of the present application.

Explanation of symbols in the figure:

1. Bottom plate; 2. Support legs; 3. Adjusting knob; 4. Potential transformer body; 5. First protective cover; 6. Top cover; 7. Second protective cover; 8. Shell; 9. Connecting piece; 10, bolt; 11, spacer; 12, bracket; 13, rotating shaft; 14, cooling fan; 15, threaded rod; 16, first gear; 17, second gear; 18, fixed frame; 19, worm; 20, Turbine; 21, rotating rod; 22, base; 23, fixed block; 24, connecting rod; 25, L-shaped plate; 26, return spring; 27, place plate;

Detailed ways

The technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the application; obviously, the described embodiments are only some of the embodiments of the application, not all of them, based on The embodiments in the present application and all other embodiments obtained by persons of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the orientations shown in the drawings Or positional relationship is only for the convenience of describing the present application and simplifying the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "set with", "sleeved/connected", "connected", etc. should be understood in a broad sense, such as " Connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal connection between two components. connectivity. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

Example 1:

The present application will be described in further detail below in conjunction with accompanying drawings 1-7.

The embodiment of the present application discloses a protection device for a power grid voltage transformer below 35KV, which includes a base plate 1, and the four corners of the bottom end of the base plate 1 are fixedly connected with supporting legs 2, and the top end of the base plate 1 is provided with a first protective cover 5, the first The top of the protective cover 5 is provided with a top cover 6, the top of the top cover 6 is provided with a rectangular hole, the inside of the first protective cover 5 is provided with a second protective cover 7, and the outer wall of the second protective cover 7 slides with the inner wall of the top cover 6 Interspersed connection, the inside of the second protective cover 7 is provided with a voltage transformer body 4, and the bottom end of the voltage transformer body 4 is provided with a base 22;

The inner walls on both sides of the base 22 are provided with notches symmetrically, and the insides of the two notches are provided with mobile and fixed components. There are sockets matching one end of the L-shaped board 25 symmetrically, and the opposite ends of the two L-shaped boards 25 are respectively slid and connected to the inside of the two sockets;

The inside of the bottom plate 1 is provided with a gear groove, and the inside of the gear groove is provided with a gear linkage assembly. The gear linkage assembly includes a first gear 16, a threaded rod 15, a second gear 17, a rotating rod 21, a fixed frame 18 and a driving mechanism. The top outer wall of the threaded rod 15 is provided with threads;

The driving mechanism comprises a worm gear 20 and a worm screw 19. The rod walls at both ends of the worm screw 19 are provided with threads suitable for the two worm gears 20. One end of the worm screw 19 is rotationally connected with the back inner wall of the base plate 1, and the other end of the worm screw 19 extends to The front of the base plate 1 is fixedly connected with an adjustment knob 3;

Turn the adjusting knob 3 to drive the turbine 20 to rotate through the worm 19, and then drive the threaded rod 15 to rotate through the mutual cooperation between the rotating rod 21, the second gear 17 and the first gear 16, so that the base 22 drives the second protective cover 7 to lift , and then make the mobile and fixed components run, so that a number of adjustment controls can be completed through a set of controls. When using this device, the device can be flexibly adjusted according to the environment and conditions of use, making the device more convenient to use. convenient.

The bottoms of a plurality of threaded rods 15 are respectively rotatably connected to the bottom inner wall of the base plate 1, and two fixed blocks 23 are fixedly connected to both sides of the base 22, and the insides of the plurality of fixed blocks 23 are provided with threaded holes, and the plurality of threaded holes The internal threads match the threads on the top outer walls of the plurality of threaded rods 15 , and the tops of the plurality of threaded rods 15 extend to the top of the bottom plate 1 and are respectively connected to the interiors of the plurality of fixing blocks 23 for rotation.

A plurality of first gears 16 are sleeved on the bottoms of the plurality of threaded rods 15 respectively, and the outer walls of the plurality of first gears 16 mesh with the outer walls of the plurality of second gears 17 respectively, and the opposite sides of the plurality of second gears 17 are respectively It is fixedly connected to the two ends of the two rotating rods 21.

A plurality of fixing brackets 18 are symmetrically sheathed on the two ends of the two rotating rods 21 respectively, and the top and bottom ends of the plurality of fixing brackets 18 are respectively fixedly connected to the inner wall of the bottom plate 1 .

The two worm gears 20 are sleeved on the middle outer walls of the two rotating rods 21 respectively. The rod is threadedly engaged, and by setting the worm gear 20 and the worm screw 19, multiple joint adjustment controls can be completed.

The opposite end rod walls of the two connecting rods 24 are slidably connected with the two sides of the base 22, and the opposite ends of the two connecting rods 24 are respectively fixedly connected with the bottom of the opposite side of the two L-shaped plates 25, and the two L-shaped plates 25 The top outer walls of the bases are slidably connected with the tops of the base 22 respectively.

The bottoms of the opposite sides of the two L-shaped plates 25 are fixedly connected with the opposite ends of the two return springs 26 respectively, and the opposite ends of the two return springs 26 are respectively fixedly connected with the inner wall of the base 22, and the top of the base 22 is fixedly connected with a placement plate 27. The top of the placement plate 27 is fixedly connected to the bottom of the voltage transformer body 4.

The tops of a plurality of threaded rods 15 are respectively rotatably connected to the bottom of the top cover 6, the top inner walls on both sides of the first protective cover 5 are fixedly connected with trapezoidal blocks 28, and both sides of the second protective cover 7 are symmetrically provided with cooling holes. One side of the first protective cover 5 is fixedly connected with the housing 8 , and the trapezoidal block 28 is provided so that the connecting rod 24 can also be squeezed when the connecting rod 24 slides along the surface of the trapezoidal block 28 .

One side of the housing 8 is fixedly connected with a bracket 12, and the inside of the housing 8 is provided with a cooling fan 14, and the inside of the cooling fan 14 is fixedly sleeved with a rotating shaft 13, and the cooling fan 14 is provided to ventilate and dissipate heat inside the protective cover .

Both sides of the first protective cover 5 are fixedly equipped with connecting pieces 9, and the bottom ends of a plurality of connecting pieces 9 are respectively fixedly installed at the four corners of the top of the base plate 1, and the tops of a plurality of connecting pieces 9 are all screwed with bolts 10, and many Washers 11 are sheathed on the tops of each bolt 10 .

The implementation principle of a protection device for a power grid voltage transformer below 35KV in the embodiment of the present application is as follows: when dismantling and maintaining, the hand-held adjustment knob 3 drives the worm 19 to rotate, and the two ends of the worm 19 are provided with threads, and are connected to the two turbines 20 Mesh with each other, so the worm 19 drives the two worm gears 20 to rotate during the rotation process, and the plurality of second gears 17 are respectively fixedly connected by two rotating rods 21, and the two worm gears 20 are respectively sleeved on two The middle outer wall of the rotating rod 21 , so the two worm gears 20 respectively drive the second gears 17 on both sides to rotate through the two rotating rods 21 during the rotation process.

Since the outer walls of the plurality of second gears 17 are respectively meshed with the outer walls of the plurality of first gears 16, the first gears 16 can be moved to rotate, and the plurality of first gears 16 are respectively sleeved on the bottoms of the plurality of threaded rods 15 , and then drive a plurality of threaded rods 15 to rotate through the first gear 16, the top outer walls of the plurality of threaded rods 15 are provided with threads, and the inside of the fixed block 23 on both sides of the base 22 is provided with threads that are compatible with the threaded rods 15 , so the plurality of fixed blocks 23 will drive the base 22 to move upwards with the rotation of the plurality of threaded rods 15, and the connecting rods 24 on both sides will contact the trapezoidal blocks 28 during the rising process of the base 22.

As the base 22 continues to rise, the connecting rods 24 on both sides will move inwardly due to the extrusion and contraction of the two trapezoidal blocks 28, and the connecting rods 24 on both sides will drive the L-shaped plate 25 in the process of moving inwardly. To move to make it separate from the bottom of the second protective cover 7, and squeeze the return spring 26, when the second protective cover 7 is lifted to the top of the first protective cover 5, stop turning the adjustment knob 3, and then turn the second protective cover 7 Two protective covers 7 are removed.

During installation, turn the adjustment knob 3 in the opposite direction to drive the worm 19 to rotate in the opposite direction. The two ends of the worm 19 are threaded and mesh with the two worm gears 20, so the worm 19 drives the two worms in the process of reverse rotation. The two worm gears 20 rotate in reverse, and the plurality of second gears 17 are respectively fixedly connected by two rotating rods 21, and the two worm gears 20 are respectively sleeved on the middle outer walls of the two rotating rods 21, so the two worm gears 20 In the process of reverse rotation, the second gears 17 on both sides are respectively driven to reverse rotation by the two rotating rods 21 .

Since the outer walls of the plurality of second gears 17 are respectively meshed with the outer walls of the plurality of first gears 16, the first gears 16 can be dialed to rotate in reverse, and the plurality of first gears 16 are sleeved on the plurality of threaded rods 15 respectively. and then through the first gear 16 to drive a plurality of threaded rods 15 to rotate coaxially. Adapted threads, so multiple fixed blocks 23 will drive the base 22 to move downward with the rotation of multiple threaded rods 15, and the connecting rods 24 on both sides will slowly separate from the trapezoidal blocks 28 during the descent of the base 22 .

As the base 22 continues to rise, the connecting rods 24 on both sides will reduce due to the extrusion force. Under the action of the return springs 26 on both sides, the L-shaped plate 25 will spread outwards and move outwards, and at the same time drive the connecting rods 24 outwards. Diffusion movement, when the connecting rod 24 is completely separated from the trapezoidal block 28, the top of the L-shaped plate 25 will be inserted into the bottom of the second protective cover 7, and the second protective cover 7 will be installed and fixed. When the second protective cover 7 is received in When inside the first protective cover 5, stop turning the adjusting knob 3.

All of the above are preferred embodiments of the present application, and are not intended to limit the protection scope of the application. Therefore, all equivalent changes made according to the structure, shape and principle of the application should be covered by the protection scope of the application. Inside.

Claims (10)

1. The protection device for the voltage transformer of the power grid below 35KV comprises a bottom plate (1), and is characterized in that: the bottom four corners of the bottom plate (1) are fixedly connected with supporting legs (2), a first protective cover (5) is arranged at the top end of the bottom plate (1), a top cover (6) is arranged at the top end of the first protective cover (5), a rectangular hole is formed in the top end of the top cover (6), a second protective cover (7) is arranged inside the first protective cover (5), the outer wall of the second protective cover (7) is connected with the inner wall of the top cover (6) in a sliding and penetrating manner, a voltage transformer body (4) is arranged inside the second protective cover (7), and a base (22) is arranged at the bottom end of the voltage transformer body (4);

notches are symmetrically formed in the inner walls of two sides of the base (22), moving fixing assemblies are arranged inside the two notches and comprise connecting rods (24), L-shaped plates (25) and return springs (26), inserting holes matched with one ends of the L-shaped plates (25) are symmetrically formed in the inner wall of the bottom of the second protective cover (7), and opposite ends of the two L-shaped plates (25) are respectively connected inside the two inserting holes in a sliding and penetrating manner;

a gear groove is formed in the bottom plate (1), a gear linkage assembly is arranged in the gear groove and comprises a first gear (16), a threaded rod (15), a second gear (17), a rotating rod (21), a fixing frame (18) and a driving mechanism, and threads are formed in the outer wall of the top of each threaded rod (15);

actuating mechanism includes turbine (20) and worm (19), the both ends pole wall of worm (19) all be provided with two turbine (20) looks adaptation and screw thread, the one end of worm (19) is rotated with the back inner wall of bottom plate (1) and is connected, the other end of worm (19) extends to the front of bottom plate (1), and fixedly connected with adjust knob (3).

2. A protection device for a below 35KV grid voltage transformer according to claim 1, characterized in that: it is a plurality of the bottom of threaded rod (15) rotates with the bottom inner wall of bottom plate (1) respectively to be connected, two fixed block (23) of the equal fixedly connected with in both sides of base (22), it is a plurality of threaded hole is all seted up to the inside of fixed block (23), and is a plurality of the top of threaded rod (15) extends to the top of bottom plate (1), and is connected with the internal rotation of a plurality of fixed block (23) respectively.

3. A protection device for a below 35KV grid voltage transformer according to claim 1, characterized in that: it is a plurality of first gear (16) is established respectively in the bottom of a plurality of threaded rods (15), and is a plurality of the outer wall of first gear (16) respectively with the outer wall intermeshing of a plurality of second gear (17), it is a plurality of one side that second gear (17) is relative is fixed connection respectively at the both ends of two dwang (21).

4. A protection device for a below 35KV grid voltage transformer according to claim 1, characterized in that: a plurality of mount (18) are the symmetrical cover respectively and are established at the both ends pole wall of two dwang (21), and are a plurality of the top and the bottom of mount (18) are respectively in the inner wall fixed connection of bottom plate (1).

5. A protection device for a below 35KV grid voltage transformer according to claim 1, characterized in that: two turbine (20) are established respectively and are established at the middle part outer wall of two dwang (21), the both ends pole wall of worm (19) all is provided with the screw thread with turbine (20) looks adaptation, two the outer wall of turbine (20) respectively with the both ends armed lever screw thread of worm (19) to the meshing.

6. A protection device for a below 35KV grid voltage transformer according to claim 1, characterized in that: two the opposite one end pole wall of connecting rod (24) is connected with the both sides slip interlude of base (22), two the one end that connecting rod (24) is relative respectively with two opposite one side bottom fixed connection of L template (25), two the top outer wall of L template (25) respectively with the top sliding connection of base (22).

7. A protection device for a below 35KV grid voltage transformer according to claim 1, characterized in that: the bottom of one side opposite to the two L-shaped plates (25) is fixedly connected with one ends opposite to the two return springs (26), the other ends opposite to the two return springs (26) are fixedly connected with the inner wall of the base (22), the top end of the base (22) is fixedly connected with a placing plate (27), and the top end of the placing plate (27) is fixedly connected with the bottom end of the voltage transformer body (4).

8. A protection device for a below 35KV grid voltage transformer according to claim 1, characterized in that: a plurality of the top of threaded rod (15) rotates respectively and connects the bottom at top cap (6), the both sides top inner wall fixedly connected with trapezoidal piece (28) of first protection casing (5), the louvre has been seted up to the equal symmetry in both sides of second protection casing (7), one side fixedly connected with casing (8) of first protection casing (5).

9. The protection device of a below 35KV grid voltage transformer of claim 8, characterized in that: one side fixedly connected with support (12) of casing (8), the inside of casing (8) is provided with radiator fan (14), the fixed cover in inside of radiator fan (14) has connect pivot (13).

10. The protection device of a below 35KV grid voltage transformer of claim 1, characterized in that: the equal fixed mounting in both sides of first protection casing (5) has connection piece (9), and is a plurality of the bottom of connection piece (9) is fixed mounting respectively in the top four corners department of bottom plate (1), and is a plurality of the equal threaded connection in top of connection piece (9) has bolt (10), and is a plurality of the top of bolt (10) all is overlapped and is equipped with gasket (11).

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