High-reliability de-excitation device of water-turbine generator set

Abstract

The utility model relates to the technical field of field suppression devices, in particular to a high-reliability field suppression device of a water-turbine generator set, which comprises a base. Guide rods are fixed in the strip-shaped grooves, and springs are arranged on the guide rods in a sleeving manner; sliding blocks are installed on the guide rods in a sliding mode, one ends of the springs abut against the sliding blocks, a limiting frame is fixed between the top ends of the two sliding blocks, and a plurality of limiting holes are formed in one side wall of the limiting frame; through the arrangement of the limiting frame, the shell and the like, the limiting rod on the shell is matched with the limiting hole in the limiting frame in an inserted mode, the limiting rod can be separated from the limiting hole by pushing the limiting frame towards the two sides, limitation on the shell is conveniently relieved, and then the shell is conveniently and rapidly disassembled; by means of the design, the shell can be rapidly disassembled and assembled, when the water-turbine generator set breaks down and needs to be rapidly overhauled, maintenance personnel can rapidly open the shell for overhauling and maintenance, and the operation efficiency and safety of the whole generator set are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of demagnetization devices, in particular to a high-reliability demagnetization device for a hydro-generator set. Background Art

[0002] The hydroelectric generator set is the main power equipment for producing electricity in a hydropower station, also known as a "hydroelectric generator set" or "hydroelectric generator". It is mainly composed of a turbine, a generator, a speed governor, an excitation system, a cooling system and a power station control device; the demagnetization device is an important safety protection device, and its main function is to quickly reduce the generator voltage to zero when the generator is disconnected or an internal fault occurs, to prevent the generator from continuing to supply short-circuit current to the fault point, thereby limiting the expansion of the accident.

[0003] The utility model patent with the authorization announcement number CN220985315U discloses a control device for an excitation DC magnetic field circuit breaker, the control device for the excitation DC magnetic field circuit breaker comprises a shell, the shell is connected to the shell of the generator, and the shell is provided with a demagnetization resistor for consuming the residual potential of the generator, a switch mechanism for switching the circuit, a current relay for triggering the switch mechanism, and a capacitor for providing a safe power supply for the switch mechanism; the switch mechanism: the push rod of the electromagnetic push rod is connected to the adapter sleeve through the swing arm fixing sleeve, and the adapter sleeve is insulated, and one end of the adapter sleeve is provided with a first A copper seat, a first copper column and a first copper sleeve, and the other end of the adapter sleeve is symmetrically provided with a second copper seat, a second copper column and a second copper sleeve, the electromagnetic push rod pushes and pulls the adapter sleeve to control the plugging between the first copper column and the first copper sleeve, and between the second copper column and the second copper sleeve; the device detects the overload of the generator as a signal through the current relay, switches the capacitor to power the electromagnetic push rod, and the electromagnetic push rod pulls the first copper column out of the first copper sleeve and inserts the second copper column into the second copper sleeve, so that the demagnetization resistor is connected in series with the generator, thereby disconnecting the generator from the power generation circuit, and also converts the residual potential into heat energy consumption, thereby protecting the generator.

[0004] Although the control device of the excitation DC field circuit breaker has a protective effect on the generator, the device still has the following problems in actual use: the shell of the device is mainly used to protect the internal demagnetization resistors, switch mechanisms, capacitors and other key components. However, since the shell is directly fixed to the generator housing, in routine maintenance work, the shell must be removed before access to these internal components for inspection. The existing shell fixing method mostly uses bolt connection. This connection method requires the use of tools such as wrenches during disassembly, which is not only cumbersome to operate, but also inefficient. This design makes it difficult for maintenance personnel to quickly and conveniently inspect and maintain key structures such as demagnetization resistors, switch mechanisms and capacitors in emergency situations, such as when a generator fails and needs to be repaired quickly, which may affect the operating efficiency and safety of the entire generator set. In view of this, we propose a high-reliability demagnetization device for a hydro-turbine generator set. Utility Model Content

[0005] The utility model aims to provide a high-reliability demagnetization device for a hydro-generator set to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A high-reliability demagnetization device for a hydro-generator set comprises a base, wherein two strip grooves are arranged at the top of the base at both left and right ends, guide rods are fixed in the strip grooves, and springs are sleeved on the guide rods;

[0008] A slider is slidably mounted on each guide rod, and one end of a spring is pressed against the slider. A limit frame is fixed between the top ends of the two sliders, and a plurality of limit holes are provided on one side wall of the limit frame.

[0009] A boss is installed on the top of the base, and an energy dissipation device and an automatic demagnetization switch are installed on the top of the boss;

[0010] A shell is arranged above the base, the bottom of the shell is open, and the bottom of the shell is plugged into the boss, and a plurality of limit rods are fixed to the left and right side walls of the shell, and the limit rods are plugged into the corresponding limit holes.

[0011] As a preferred technical solution of the utility model, both left and right side walls of the shell are provided with threading holes, and the threading holes penetrate the shell.

[0012] As a preferred technical solution of the utility model, the size of the bottom opening of the shell is matched with the size of the boss, and the shell is a product made of aluminum alloy.

[0013] As a preferred technical solution of the utility model, the overall shape of the limit frame is L-shaped, and the limit frame is fixedly connected to the slider by bolts.

[0014] As a preferred technical solution of the utility model, the cross-sectional shape of the strip groove is rectangular, and the size of the strip groove is matched with the size of the slider.

[0015] As a preferred technical solution of the utility model, a convex block is installed at the top center of the limiting frame, and a pull groove is opened on the top of the convex block.

[0016] As a preferred technical solution of the utility model, the energy dissipation device is fixedly connected to the boss by bolts, and the automatic demagnetization switch is fixedly connected to the boss by bolts.

[0017] As a preferred technical solution of the present invention, mounting holes are provided at the four corners of the base, and the cross-sectional shape of the mounting holes is circular.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] Through the energy dissipation device and automatic demagnetization switch, the demagnetization switch can control the on and off of the excitation current, and the energy dissipation resistor consumes the magnetic field energy in the rotor inductance, thereby protecting the hydro-turbine generator set; through the setting of the limit frame and the shell, the limit rod on the shell is plugged into the limit hole on the limit frame, and the limit rod can be disengaged from the limit hole by pushing the limit frame to both sides, which is convenient for releasing the restriction on the shell, and then facilitating the rapid disassembly of the shell; this design realizes the rapid disassembly and assembly of the shell. When the hydro-turbine generator set fails and needs to be repaired quickly, the maintenance personnel can quickly open the shell for inspection and maintenance, ensuring the operating efficiency and safety of the entire generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the base in the utility model;

[0022] Figure 3 It is a structural schematic diagram of the boss in the utility model;

[0023] Figure 4 It is a schematic diagram of a part of the explosion structure in the utility model;

[0024] Figure 5 It is a structural schematic diagram of the shell in the utility model.

[0025] In the figure:

[0026] 1. Base; 10. Boss; 11. Strip groove; 12. Mounting hole; 13. Guide rod; 14. Spring; 15. Limiting frame; 16. Slider; 17. Bump;

[0027] 2. Energy consuming devices;

[0028] 3. Automatic demagnetization switch;

[0029] 4. Shell; 40. Threading hole; 41. Limit rod. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] This embodiment provides a technical solution:

[0032] See also Figure 1-Figure 5 As shown, a high-reliability demagnetization device for a hydro-generator set comprises a base 1, wherein two strip grooves 11 are provided at the top and the left and right ends of the base 1, guide rods 13 are fixed in the strip grooves 11, and springs 14 are sleeved on the guide rods 13; sliders 16 are slidably mounted on the guide rods 13, and one end of the spring 14 is pressed against the slider 16, a limiting frame 15 is fixed between the top ends of the two sliders 16, and a side wall of the limiting frame 15 is provided with a plurality of limiting holes; a boss 10 is installed on the top of the base 1, and an energy dissipation device 2 and an automatic demagnetization switch 3 are installed on the top of the boss 10; a shell 4 is provided above the base 1, the bottom of the shell 4 is open, and the bottom of the shell 4 is plug-fitted with the boss 10, and a plurality of limiting rods 41 are fixed on the left and right side walls of the shell 4, and the limiting rods 41 are plug-fitted with the corresponding limiting holes.

[0033] In this embodiment, both left and right side walls of the housing 4 are provided with threading holes 40, and the threading holes 40 penetrate the housing 4. The provision of the threading holes 40 facilitates the wires to enter and exit the housing 4, and facilitates wiring between devices.

[0034] In this embodiment, the size of the bottom opening of the housing 4 matches the size of the boss 10, and the housing 4 is made of aluminum alloy. This design facilitates a stable connection between the housing 4 and the boss 10, improves the waterproof performance between the housing 4 and the boss 10, and the aluminum alloy material has the advantage of corrosion resistance, which ensures the service life of the housing 4.

[0035] In this embodiment, the overall shape of the limiting frame 15 is L-shaped, and the limiting frame 15 is fixedly connected to the slider 16 by bolts. The L-shaped setting is convenient for limiting the housing 4 from both sides by the limiting frame 15, and the bolt fixing method ensures the reliability of the connection between the limiting frame 15 and the slider 16.

[0036] In this embodiment, the cross-section of the strip groove 11 is rectangular, and the size of the strip groove 11 matches the size of the slider 16. This design facilitates the slider 16 to slide stably and smoothly in the strip groove 11, ensuring the stability of the slider 16 and the limit frame 15.

[0037] In this embodiment, a protrusion 17 is installed at the center of the top of the limiting frame 15, and a shifting groove is provided on the top of the protrusion 17. The shifting groove facilitates the horizontal movement of the limiting frame 15, thereby facilitating the disassembly and assembly of the housing 4.

[0038] In this embodiment, the energy dissipation device 2 is fixedly connected to the boss 10 by bolts, and the automatic demagnetization switch 3 is fixedly connected to the boss 10 by bolts. The bolt fixing method ensures the installation reliability of the energy dissipation device 2 and the automatic demagnetization switch 3, and at the same time ensures the stability of the energy dissipation device 2 and the automatic demagnetization switch 3.

[0039] In this embodiment, mounting holes 12 are provided at the four corners of the base 1, and the cross-section of the mounting holes 12 is circular. The mounting holes 12 are used to pass bolts, and then the base 1 and the casing of the generator set are conveniently installed and fixed by bolts.

[0040] It should be added that the energy dissipation device 2 in this embodiment is specifically a demagnetization resistor. When the current is suddenly interrupted, the electromagnetic field in the inductor will cause a sudden change in the potential difference, generating a high voltage pulse. The function of the demagnetization resistor is to suppress this voltage peak and prevent the components in the circuit from being damaged due to overvoltage. At the same time, in the generator excitation circuit, the demagnetization resistor can also prevent the overvoltage between the rotor windings from exceeding the allowable value, and convert the energy of the magnetic field into heat energy to accelerate the demagnetization process.

[0041] During specific use, the user first inserts his fingers into the slot and pushes the protrusions 17 to both sides. The protrusions 17 drive the limit frame 15 to move to both sides. The limit frame 15 also drives the slider 16 to slide along the guide rod 13, and the spring 14 is compressed by the slider 16. At this time, the limit frame 15 is separated from the limit rod 41, and the restriction of the limit frame 15 on the shell 4 is released. Then the user pushes the shell 4 upward, and the shell 4 is separated from the boss 10, and the shell 4 is disassembled. At this time, the energy consumption device 2 and the automatic demagnetization switch 3 are exposed and can be maintained.

[0042] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A high-reliability demagnetization device for a hydro-generator set, comprising a base (1), characterized in that: The top of the base (1) is provided with two strip grooves (11) at both left and right ends, guide rods (13) are fixed in the strip grooves (11), and springs (14) are sleeved on the guide rods (13); A slider (16) is slidably mounted on each guide rod (13), and one end of the spring (14) is pressed against the slider (16). A limiting frame (15) is fixed between the top ends of the two sliders (16), and a plurality of limiting holes are provided on one side wall of the limiting frame (15); A boss (10) is installed on the top of the base (1), and an energy dissipation device (2) and an automatic demagnetization switch (3) are installed on the top of the boss (10); A shell (4) is provided above the base (1), the bottom of the shell (4) is open, and the bottom of the shell (4) is plugged into and matched with the boss (10), and a plurality of limit rods (41) are fixed to the left and right side walls of the shell (4), and the limit rods (41) are plugged into and matched with corresponding limit holes.

2. The high-reliability demagnetization device for a hydro-generator set according to claim 1 is characterized in that: The left and right side walls of the shell (4) are both provided with threading holes (40), and the threading holes (40) penetrate the shell (4).

3. The high-reliability demagnetization device for a hydro-generator set according to claim 1 is characterized in that: The size of the bottom opening of the shell (4) is matched with the size of the boss (10), and the shell (4) is a finished product made of aluminum alloy.

4. The high-reliability demagnetization device for a hydro-generator set according to claim 1 is characterized in that: The overall shape of the limiting frame (15) is L-shaped, and the limiting frame (15) is fixedly connected to the sliding block (16) via bolts.

5. The high-reliability demagnetization device for a hydro-generator set according to claim 1 is characterized in that: The cross-sectional shape of the strip groove (11) is rectangular, and the size of the strip groove (11) is compatible with the size of the slider (16).

6. The high-reliability demagnetization device for a hydro-generator set according to claim 1 is characterized in that: A convex block (17) is installed at the top center of the limiting frame (15), and a pull groove is provided at the top of the convex block (17).

7. The high-reliability demagnetization device for a hydro-generator set according to claim 1 is characterized in that: The energy dissipation device (2) is fixedly connected to the boss (10) via bolts, and the automatic demagnetization switch (3) is fixedly connected to the boss (10) via bolts.

8. The high-reliability demagnetization device for a hydro-generator set according to claim 1 is characterized in that: The base (1) is provided with mounting holes (12) at four corners, and the cross-section of the mounting holes (12) is circular.

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