CN113658822A

CN113658822A - Phase-change isolating switch for water-pumping energy-storage power station

Info

Publication number: CN113658822A
Application number: CN202111052068.0A
Authority: CN
Inventors: 徐亚箴; 王志超
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2021-11-16

Abstract

The invention discloses a phase change isolating switch for a water pumping energy storage power station, which comprises a movable contact base, a driving cylinder, a contact bar supporting cylinder, a movable contact bar, a static contact base, a speed reducing mechanism, a grounding switch, a supporting insulator, a base and a lead screw, wherein the lower end of the supporting insulator is fixed on the base; the invention has novel structural design, improves the through-flow capacity, has high mechanical life of tens of thousands of operation times, has small abrasion, prolongs the service life of the device and has high safety and reliability.

Description

Phase-change isolating switch for water-pumping energy-storage power station

Technical Field

The invention relates to the technical field of phase change isolating switches, in particular to a phase change isolating switch for a water pumping energy storage power station.

Background

The high-voltage isolating switch is important switch equipment, plays an isolating role when a power system is overhauled so as to ensure the personal safety of maintenance personnel, is widely used and completely localized in a transmission and distribution network of the power system, has certain difficulty in design and manufacture because the rated current and the rated thermal stability current of the power station reach tens of thousands of amperes, and is partially imported.

The water pumping energy storage is a green, economic, long-life, large-scale and technically mature electric energy storage mode, and simultaneously has the functions of peak regulation, valley filling, frequency modulation, phase modulation, accident standby and the like; however, in the pumped storage power station, it is not enough that the isolating switch only has a safety isolating function; in order to realize the functional conversion of water pumping, energy storage, shutdown isolation and water discharging power generation of the generator motor, a phase-change isolating switch consisting of a plurality of single-pole isolating switches is required to firstly complete the phase-change back energy implementation of a main bus phase sequence; the function switching operation of the generator motor is often carried out for a plurality of times a day, and the phase-change isolating switch must be frequently operated, namely has the mechanical service life of 1 ten thousand times or even 2 ten thousand times, so that the requirements of the phase-change isolating switch are more strict than those of isolating switches used in transmission and distribution networks and power stations; because the design and manufacturing difficulty is high, the consumption is less, and the phase change isolating switch used for domestic water pumping energy storage power stations is the same as a generator outlet circuit breaker, so far, the phase change isolating switch is monopolized by foreign products, and the acquisition and maintenance cost is high; the existing electric contact form is that a plurality of static contact fingers are uniformly distributed in the outer circumferential direction of the cut-off ends of a movable contact seat and a static contact seat, the contact pressure between the static contact fingers and a conducting rod is generated by a spring, the left and right sliding of the conducting rod completes the opening and closing of an isolating switch, each group of electric contact units of the contact form is provided with two static contact fingers, so that 4 movable electric contact positions exist, the contact resistance is large, and the structure is complex.

At present, the localization of a generator motor is realized, and the design and manufacturing capability of a high-voltage electric appliance is close to or exceeds the advanced foreign level, so that the design technology of the phase-change isolating switch for the water pumping energy storage power station is provided, the localization is realized, and the problem to be solved in the field of the high-voltage electric appliance is urgently solved.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the existing defects, and provide the phase-change isolating switch for the water pumping energy storage power station, which has the advantages of novel structural design, improvement of through-flow capacity, small abrasion, prolongation of the service life of the device, high safety and reliability, optimization of a contact mode, reduction of contact resistance, simplification of a product structure, good heat dissipation effect and capability of effectively solving the problems in the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a pumping energy storage power station is with commutation isolator, includes that movable contact seat, driving cylinder, contact strip prop a section of thick bamboo, move contact strip, quiet contact seat, reduction gears, earthing switch, support insulator, base and lead screw, the lower extreme that supports the insulator is fixed on the base, and movable contact seat and quiet contact seat are fixed respectively on supporting the insulator top, and movable contact seat and quiet contact seat are coaxial, and have the isolation fracture between movable contact seat and quiet contact seat, driving cylinder and movable contact strip set up the inside at the movable contact seat, and the contact strip props a coaxial setting between driving cylinder and movable contact strip, and driving cylinder and contact strip prop between a section of thick bamboo and can relative slip, and reduction gears installs in the inside of base, and the lead screw is connected with the driving cylinder, and earthing switch installs on the base.

Furthermore, the movable contact base and the static contact base are both of a cylindrical structure, the outer walls of the movable contact base and the static contact base are both provided with radiators, and the inner wall of the static contact base is provided with a plurality of limiting blocks.

Furthermore, the movable contact strips are uniformly distributed on the outer ring of the contact strip supporting cylinder.

Furthermore, contact strip pressure springs are uniformly arranged at two ends of each movable contact strip.

Furthermore, V-shaped compression spring grooves are uniformly formed in the two ends of the contact bar supporting cylinder and the two ends of the driving cylinder.

Furthermore, the contact strip pressure spring is arranged in the V-shaped pressure spring groove, and the contact strip supporting cylinder pushes the contact strip pressure spring to be changed from an inclined state to a vertical state when sliding relative to the driving cylinder.

Furthermore, the electric contact parts at the two ends of the movable contact seat, the static contact seat and the movable contact strip are all silver-plated layers or silver-graphite sheets which are welded in an inlaid mode, and the electric contact parts at the two ends of the movable contact strip are of longitudinal prismatic structures.

Furthermore, a guide ring is coaxially arranged on the contact bar supporting cylinder, and the contact bar supporting cylinder is in sliding fit with the inner wall of the movable contact base through the guide ring.

Furthermore, the movable contact base is provided with a guide block.

Furthermore, the grounding switches are arranged into two groups, the grounding switches respectively correspond to the movable contact seat and the fixed contact seat, a grounding bus is fixed on the base, and the grounding switches are in flexible connection with the grounding bus.

Compared with the prior art, this energy storage power station of drawing water is with commutation isolator has following benefit:

1. the movable contact strip is arranged on the device, the contact mode of the movable contact strip with the movable contact base and the fixed contact base is linear contact, the device has a self-cleaning function, the contact is reliable, the abrasion is less than that of a point contact mode, the contact resistance is reduced, the product structure is simplified, the heat dissipation area is enlarged through the heat radiator, the heat dissipation effect of the device is ensured, and the insertion stroke of the movable contact strip can be limited through the limiting block.

2. The invention is provided with the guide block, the coaxiality of the movable contact strip and the static contact seat is ensured by adjusting the relative position between the guide block and the movable contact seat, the influence of the sinking of the upper end part of the movable contact strip due to the action of gravity when the movable contact strip is inserted into the static contact seat is avoided, the contact strip pressure spring is in an inclined state in the V-shaped pressure spring groove at the opening position and in the closing process, the compression amount is reduced, namely the contact pressure is reduced, the abrasion of a silver plating surface is reduced due to the low contact pressure, and the mechanical service life of a product is prolonged.

3. The invention is provided with the guide ring, and the coaxiality of the lower end part of the movable contact strip and the movable contact seat is ensured through the coaxial sliding fit of the guide ring and the inner cavity of the movable contact seat.

Drawings

FIG. 1 is a schematic structural diagram of a brake-separating position according to the present invention;

FIG. 2 is a schematic sectional view of the brake-separating position of the present invention;

FIG. 3 is an enlarged schematic view of the structure at the position A of the present invention;

FIG. 4 is a partial structure diagram of the switching on position of the present invention;

FIG. 5 is a schematic diagram of a structure of the switching on position of the present invention.

In the figure: the device comprises a movable contact base 1, a guide block 2, a driving barrel 3, a contact bar supporting barrel 4, a movable contact bar 5, a radiator 6, a static contact base 7, an insulating torsion bar 8, a speed reducing mechanism 9, a grounding switch 10, a supporting insulator 11, a grounding bus 12, a grounding base 13, a lead screw 14, a limiting block 15, a guide ring 16, a cylindrical pin 17, a bevel gear rack 18, a bevel gear 19, a bevel gear 20, a contact bar compression spring 21, a spring groove 22V-shaped compression spring, a static contact 23 and a movable knife switch 24.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1-5, the present invention provides a technical solution: the utility model provides a pumping energy storage is commutation isolator for power station, includes that movable contact seat 1, drive cylinder 3, contact strip prop a section of thick bamboo 4, movable contact strip 5, stationary contact seat 7, reduction gears 9, earthing switch 10, support insulator 11, base 13 and lead screw 14, its characterized in that: the lower extreme of supporting insulator 11 is fixed on base 13, movable contact seat 1 and stationary contact seat 7 are fixed respectively on supporting insulator 11 top, movable contact seat 1 and stationary contact seat 7 are coaxial, and there is the isolation fracture between movable contact seat 1 and stationary contact seat 7, driving cylinder 3 and movable contact strip 5 set up the inside at movable contact seat 1, the contact strip props the coaxial setting of section of thick bamboo 4 between driving cylinder 3 and movable contact strip 5, can relative slip between driving cylinder 3 and the contact strip props section of thick bamboo 4, reduction gears 9 installs the inside at base 13, lead screw 14 is connected with driving cylinder 3, earthing switch 10 installs on base 13.

Because the current is huge, connecting conductors from the generator to the transformer are tubular round buses, and in order to realize compatible installation or replacement with the existing generator circuit breaker and phase-change isolating switch, the movable contact base 1 and the stationary contact base 7 of the embodiment are made of large-caliber thin-wall copper pipes, a plurality of wiring planes are uniformly distributed in the circumferential direction of wiring ends of the movable contact base and the stationary contact base, a plurality of flexible connections can be conveniently connected with the pipeline buses, and the structure is compact and easy to install and maintain.

In order to further reduce the temperature rise and improve the current capacity, the movable contact base 1 and the fixed contact base 7 are provided with the heat radiator 6.

As shown in the attached drawing 1, the movable contact base 1, the movable contact strip 5 and the fixed contact base 7 which are coaxially arranged form a through-flow loop of the phase change isolating switch, the movable contact base 1 and the fixed contact base 7 are respectively supported by a plurality of supporting insulators 11 and fixed on a base 13, a certain axial distance is reserved between the movable contact base 1 and the fixed contact base 7, a visible isolating fracture is formed to play a safety isolating function, the movable contact strips 5 are uniformly arranged on the circumference of a contact strip supporting cylinder 4, and the movable contact strips 5 move left and right under the driving of a driving cylinder 3 which is coaxially arranged with the contact strip supporting cylinder 4, so that the circuit of the embodiment is connected or disconnected.

The reducing mechanism 9 is installed inside the base 13, the reducing mechanism 9 is connected with the small bevel gear 20 through the insulating torsion bar 8, the bevel gear rack 18 is fixed in the inner cavity of the movable contact base 1, the large bevel gear 19 is sleeved on the bevel gear rack 18 in a hollow mode, the large bevel gear 19 is fixedly connected with the lead screw 14, during operation, the reducing mechanism 9 rotates forwards or backwards, the lead screw 14 drives the driving cylinder 3 to move in the up and down directions shown in the attached drawing 2 to complete the switching-on operation, a plurality of limiting blocks 15 are fixed on the inner circle of the fixed contact base 7, the limiting blocks 15 are at a certain distance from the lower end of the fixed contact base 7 shown in the drawing 2, the distance determines the insertion stroke of the movable contact strip 5, and when the driving cylinder 3 cannot move any more after colliding with the limiting blocks 15, the switching-on operation is completed, and the reducing mechanism 9 stops rotating.

The key influencing the current capacity depends on the size of the contact resistance of the movable electrical contact part, the number of the movable electrical contact parts is large, the contact resistance in the form of a series loop is large, the temperature rise in the current flowing process is high, and the current capacity is low, as shown in figure 2, in the embodiment, the two fixed contact fingers and the conducting rod are combined into one part, namely the movable contact strip 5, so that the number of the movable contact parts of each group of electrical contact units is reduced from 4 to two, the contact resistance is reduced, the product structure is simplified, under the same electrical contact form and pressure, the contact resistance of the silver surface is the lowest, the electrical contact parts of the movable contact base 1, the fixed contact base 7 and the movable contact strip 5 are silver-plated surfaces or silver sheets 17, the electrical contact parts of the two ends of the movable contact strip 5 in the embodiment are longitudinal prismatic structures, the contact mode with the movable contact base 1 and the fixed contact base 7 is a line contact, and the self-cleaning function is achieved, the contact is reliable and has less abrasion than a point contact mode.

According to experience, the hardness HV 50-60 of the silver surface when the contact surface is plated with common silver and the silver plating thickness of the product of the embodiment with the mechanical life of 1 ten thousand times is not less than 50 mu m, the thick silver plating layer is often peeled off from an electric conductor, so the silver plating process is a professional process, for example, the mechanical life is 2 ten thousand times, the hardness HV 150-180 of the hard silver surface of the contact surface can be plated with hard silver or carbon silver AgC3, or silver graphite sheets AgC4 are inlaid at certain contact parts, and the silver carbon layer and the silver graphite sheets have self-lubricating property and high wear resistance.

In this embodiment, the contact pressure of the electrical contact parts at the two ends of the moving contact strip 5 to the moving contact base 1 and the fixed contact base 7 is generated by a contact strip compression spring 21 arranged between the moving contact strip 5 and the driving cylinder 3, after the technical parameters of the contact strip compression spring 21 are determined, the compression height of the contact strip compression spring is changed to change the contact pressure, the contact resistance is reduced when the contact pressure is larger, but the abrasion of the silver coating is larger, and the influence of the contact pressure on the through-flow capacity and the mechanical life of the product is larger.

The abrasion of the silver coating is generated when the movable contact strip 5 moves during the opening and closing operation of the phase change isolating switch, and no current passes through the phase change isolating switch in the opening state and the closing operation, so that the design measures of the embodiment are that the contact pressure between the contact surfaces of the movable contact base 1, the fixed contact base 7 and the movable contact strip 5 is reduced by taking measures so as to reduce the abrasion, and the original design value is restored when the closing operation is finished so as to ensure the through-current capacity.

As shown in fig. 2, the structural scheme according to the above design concept is that a contact bar supporting cylinder 4 is coaxially arranged between a driving cylinder 3 and a movable contact bar 5, and the driving cylinder 3 and the contact bar supporting cylinder 4 have a certain stroke of relative displacement, the movable contact bar 5 has a small amount of movement in the radial direction of the contact bar supporting cylinder 4 to enable a contact bar pressure spring 21 to press the contact bar pressure spring, two V-shaped pressure spring grooves 22 with the same structure are correspondingly arranged at two ends of the contact bar supporting cylinder 4 and the driving cylinder 3, the contact bar pressure spring 21 is arranged in the V-shaped pressure spring grooves 22, due to the common thrust of a plurality of contact bar pressure springs 21, the contact bar pressure spring 21 is in an inclined state in the V-shaped pressure spring grooves 22 at the opening position and in the closing process, so that the compression amount is reduced, i.e. the contact pressure is reduced, the low contact pressure reduces the wear of a silver plating surface, the mechanical life of the product is prolonged, the closing is started, the lead screw 14 pushes the driving cylinder 3, the driving cylinder 3 pushes the contact bar supporting cylinder 4, the contact strip supporting cylinder 4 moves continuously after moving across the isolation fracture, stops when moving to a limit block 15 fixedly installed in the static contact seat 7 and collides with the same, but the driving cylinder 3 still moves continuously, and the closing operation is completed as shown in an attached drawing 4 after the driving cylinder 3 moves to the limit block 15, at the moment, the contact strip pressure spring 21 is pushed by the driving cylinder 3 to be in a vertical state, namely, the compression amount is recovered to a designed value, the contact resistance meets the requirement, and the long-term through-current capacity of a product is ensured.

As shown in fig. 2, 4 oblong holes are uniformly distributed in the circumferential direction of the lower end of the contact strip supporting cylinder 4, cylindrical pins 17 are mounted on the driving cylinder 3 corresponding to the 4 oblong holes, and the cylindrical pins 17 are mounted in the oblong holes, so that the contact strip supporting cylinder 4 can only move on the driving cylinder 3 for a certain stroke but cannot rotate.

During assembly, the coaxiality between the movable contact base 1, the fixed contact base 7 and the movable contact strip 5 must be ensured, otherwise, the contact pressure between the movable contact strip 5 and the contact base 1 and the fixed contact base 7 is not uniform, so that the flow rate of each movable contact strip 5 is large, the abrasion is large, and the through-flow capacity and the mechanical service life of a product are seriously influenced, during assembly, firstly, the coaxiality between the movable contact base 1 and the fixed contact base 7 is ensured by adjusting the positions of relevant parts on the supporting insulator 11, the guide ring 20 is coaxially arranged on the contact strip supporting cylinder 4, the guide ring 20 is made of polytetrafluoroethylene with self-lubricating property and is coaxially and slidably matched with the inner cavity of the movable contact base 1 so as to ensure the coaxiality between the lower end part of the movable contact strip 5 and the movable contact base 1 as shown in figure 2, and because of gravity, the upper end part of the movable contact strip 5 is inserted into the fixed contact base 7, therefore, the guide blocks 2 are arranged at the front ends of left and right guide grooves of the movable contact base 1, the guide block 2 is provided with a guide groove meshed with the cylindrical pin 17, and the coaxiality between the movable contact strip 5 and the static contact seat 7 during closing can be ensured by adjusting the relative position between the guide block 2 and the movable contact seat 1.

Two grounding switches 10 and a grounding bus 12 are fixed on a base 13 of the embodiment, a static contact 23 at the upper end of the grounding switch 10 is respectively connected with a movable contact base 1 and a static contact base 7 through an aluminum fixing piece on a supporting insulator 11, a movable knife 24 of the grounding switch 10 is connected with the grounding bus 12 through a flexible connection, a mechanical and electrical linkage exists between the phase change isolating switch and the two grounding switches 10, the grounding switch 10 cannot be switched on when the phase change isolating switch is in a switching-on position, the grounding switch 10 can be switched on when the phase change isolating switch is in a switching-off position, and the phase change isolating switch in the switching-on position is shown in an attached drawing 5.

The phase-change isolating switch has two structural forms of a three-phase five-pole structure and a three-phase three-position structure, but the three-phase five-pole structure is more, the product of the embodiment can be directly used instead, and if the requirement exists, the three-phase three-position phase-change isolating switch can be conveniently derived on the basis of the embodiment.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a pumping energy storage is commutation isolator for power station, includes movable contact seat (1), drive cylinder (3), touch strip props a section of thick bamboo (4), movable contact strip (5), stationary contact seat (7), reduction gears (9), earthing switch (10), support insulator (11), base (13) and lead screw (14), its characterized in that: the lower end of the supporting insulator (11) is fixed on the base (13), the movable contact base (1) and the static contact base (7) are respectively fixed on the top end of the supporting insulator (11), the movable contact base (1) and the static contact base (7) are coaxial, an isolation fracture is formed between the movable contact base (1) and the static contact base (7), the driving cylinder (3) and the movable contact bar (5) are arranged in the movable contact base (1), the contact bar supporting cylinder (4) is coaxially arranged between the driving cylinder (3) and the movable contact bar (5), the driving cylinder (3) and the contact bar supporting cylinder (4) can slide relatively, the speed reducing mechanism (9) is arranged in the base (13), the lead screw (14) is connected with the driving cylinder (3), and the grounding switch (10) is arranged on the base (13).

2. The phase change isolating switch for the pumped storage power station according to claim 1, characterized in that: the movable contact seat (1) and the static contact seat (7) are both of a cylindrical structure, the outer walls of the movable contact seat (1) and the static contact seat (7) are both provided with a radiator (6), and the inner wall of the static contact seat (7) is provided with a plurality of limiting blocks (15).

3. The phase change isolating switch for the pumped storage power station according to claim 1, characterized in that: the movable contact bars (5) are uniformly distributed on the outer ring of the contact bar supporting cylinder (4).

4. The phase change isolating switch for the pumped storage power station according to claim 1, characterized in that: and contact strip pressure springs (21) are uniformly arranged at two ends of each movable contact strip (5).

5. The phase change isolating switch for the pumped storage power station according to claim 4, wherein: v-shaped compression spring grooves (22) are respectively formed in the two ends of the contact bar supporting cylinder (4) and the two ends of the driving cylinder (3).

6. The phase change isolating switch for the pumped storage power station according to claim 5, wherein: the contact strip pressure spring (21) is arranged in the V-shaped pressure spring groove (22), and when the contact strip support cylinder (4) slides relative to the driving cylinder (3), the contact strip pressure spring (21) is pushed to change from an inclined state to a vertical state.

7. The phase change isolating switch for the pumped storage power station according to claim 1, characterized in that: the electric contact parts at the two ends of the movable contact seat (1), the static contact seat (7) and the movable contact strip (5) are all silver-plated layers or silver-graphite sheets which are embedded and welded, and the electric contact parts at the two ends of the movable contact strip (5) are in longitudinal prismatic structures.

8. The phase change isolating switch for the pumped storage power station according to claim 1, characterized in that: the contact strip supporting cylinder (4) is coaxially provided with a guide ring (16), and the contact strip supporting cylinder (4) is in sliding fit with the inner wall of the movable contact base (1) through the guide ring (16).

9. The phase change isolating switch for the pumped storage power station according to claim 1, characterized in that: the movable contact base (1) is provided with a guide block (2).

10. The phase change isolating switch for the pumped storage power station according to claim 1, characterized in that: the grounding switches (10) are arranged into two groups, the grounding switches (10) respectively correspond to the movable contact base (1) and the fixed contact base (7), a grounding bus (12) is fixed on the base (13), and the grounding switches (10) are in flexible connection with the grounding bus (12).