Direct hanging type phase modifier device and phase modifier system
By designing rectangular slots and insulator limiting structures on the stator core, the cable winding end joints are located inside the stator bore, solving the problems of large workload and safety hazards in cable winding unwinding. This achieves efficient and safe cable fixing and reactive power compensation capabilities, while reducing costs and floor space.
Patent Information
- Application Number
- CN202423127765.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-18
AI Technical Summary
Large motors currently use cables as stator windings, with the cable windings set in a slotted structure resembling a string of candied hawthorns. This results in a large amount of unwinding work and a high probability of wear on the outer shielding layer of the cable. If intermediate joints are used, joint failures can easily cause insulation breakdown inside the stator bore, posing a safety hazard.
The device adopts a direct-mounted synchronous condenser. The stator core has rectangular slots, and the cable winding is wound around the stator core. Each slot contains multiple layers of cable, with insulators and pads between the layers for limiting. The ends and joints of the cable winding are located inside the stator cavity. The step-up transformer is omitted and it is directly connected to the bus. The excitation voltage is provided through the excitation transformer and excitation controller.
It improves insulation stability, reduces the workload of cable removal and the risk of cable wear, increases safety, reduces costs and floor space, improves the short-circuit ratio and reactive power compensation capability, and saves construction and commissioning time.
Smart Images
Figure CN223652022U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of camera shifting technology, and in particular relates to a direct-mounted camera shifting device and camera shifting system. Background Technology
[0002] The application of synchronous condensers is becoming increasingly widespread. Using cables as stator windings can effectively increase the rated voltage of the motor stator, realize direct grid connection without step-up transformer, and improve the short-circuit ratio, subtransient reactive power support and short-circuit capacity support capabilities of the synchronous condenser.
[0003] Existing large motors using cables as stator windings have a stator core with a slotted structure resembling a "string of candied hawthorns" formed by multiple series-connected circular holes. The cable winding is placed within these holes to secure the stator winding. This stator core structure dictates that the stator cable winding can only be unwound by passing through the circular holes in the core. Without intermediate joints, the unwound workload is substantial, requiring the winding's beginning to pass through multiple circular hole slots repeatedly, increasing the probability of wear on the cable's outer shielding layer. If intermediate joints are used, joint failure will cause insulation breakdown within the stator cavity. Furthermore, improper structural design and construction may result in situations where intermediate joints cannot be placed within the cavity, posing a safety hazard. Utility Model Content
[0004] In view of this, in order to solve the problems of existing large motors that use cables as stator windings, where the cable windings are set in a slotted structure like a "string of candied hawthorns", if no intermediate joint is used, the amount of work for unwinding the cable windings is large and the probability of wear of the cable outer shielding layer is high. If an intermediate joint is used, the joint failure will cause the insulation breakdown fault in the stator cavity, which poses a safety hazard. Therefore, this utility model proposes a direct-mounted synchronous condenser device and synchronous condenser system.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A direct-mounted synchronous condenser device includes:
[0007] The stator core is provided with a plurality of rectangular teeth at intervals along the circumferential direction.
[0008] A cable winding is wound around the stator core, and the cable winding includes multiple cables, with each slot capable of accommodating multiple layers of cables.
[0009] Multiple interlayer insulators are provided between each pair of adjacent cable layers;
[0010] Multiple pads are provided, with their two sides abutting against the inner walls of the cable and the tooth groove, respectively. The pads are located between two adjacent interlayer insulators, and the multiple pads in each tooth groove are arranged one-to-one with the multilayer cable in each tooth groove.
[0011] As a preferred embodiment of the above-mentioned direct-mounted synchronous condenser device, a first limiting ramp is provided on both sides of the interlayer insulator. The first limiting ramp has a first arc segment and a first straight segment, and the cable can fit with the first arc segment of two adjacent interlayer insulators.
[0012] As a preferred embodiment of the above-mentioned direct-mounted synchronous condenser device, the inner wall of each tooth groove is provided with multiple limiting arc grooves, and the cable can fit into the groove wall of the limiting arc groove. The multiple limiting arc grooves provided on the inner wall of each tooth groove correspond one-to-one with the multi-layer cable.
[0013] As a preferred embodiment of the above-mentioned direct-mounted synchronous condenser device, the pad is made of insulating material.
[0014] As a preferred embodiment of the above-mentioned direct-mounted synchronous condenser device, it also includes multiple slot bottom pads, which are disposed between the bottom of the slot and the bottommost cable, with each slot bottom pad corresponding to a slot.
[0015] As a preferred embodiment of the above-mentioned direct-mounted synchronous condenser device, the bottom pad of the trough is provided with a second limiting slope, the second limiting slope having a second arc segment and a second straight segment, and the bottom cable can fit with the second arc segment of the bottom pad of the trough.
[0016] As a preferred embodiment of the above-mentioned direct-mounted synchronous condenser, the ends of the cable windings and the cable joints are both located inside the stator bore.
[0017] The present invention also provides a synchronous condenser system, including the above-mentioned direct-connected synchronous condenser device, wherein the direct-connected synchronous condenser device is directly connected to the bus via a step-up substation switch, and further includes a starter motor, a frequency converter, and a step-up substation switch. The rotor of the direct-connected synchronous condenser device is connected to the rotor of the starter motor via a coupling, and the stator side of the starter motor is connected to the output terminal of the frequency converter.
[0018] As a preferred embodiment of the above-mentioned synchronous condenser system, the starter motor is installed on the slip ring side of the rotor of the direct-mounted synchronous condenser device.
[0019] As a preferred embodiment of the above-mentioned synchronous condenser system, it also includes an excitation transformer and an excitation controller. The station power or plant power is connected to the primary winding of the excitation transformer, the secondary winding of the excitation transformer is connected to the excitation controller, and the output end of the excitation controller is connected to the rotor slip ring of the direct-connected synchronous condenser device.
[0020] Compared with the prior art, the beneficial effects of the direct-mounted synchronous condenser device and synchronous condenser system provided by this utility model are:
[0021] 1. This utility model provides a direct-mounted synchronous condenser device and system. In this device, each slot contains multiple layers of cables, and an interlayer insulator is provided between every two adjacent cables to improve insulation stability. Each side of the interlayer insulator has a first limiting ramp, which limits the cables on both sides of the insulator, allowing the cables to move towards one side of the slot and securing them. The upper and lower sides of the pad contact and abut against two interlayer insulators, and the left and right sides of the pad contact and abut against one sidewall of the cable and slot, respectively, fixing the cable's position within the slot. The cable is embedded in the limiting arc-shaped groove, positioned between the groove and the pad, ensuring good contact between the cable winding and the stator core, and also limiting the cable's position. Because one end of the slot has an opening, this direct-mounted synchronous condenser device allows for layer-by-layer cable winding installation, resulting in high efficiency and reducing cable wear. This direct-mounted synchronous condenser device can achieve the radial overall unwinding of the cable winding while maintaining good grounding and fixation of the cable winding.
[0022] 2. This utility model provides a direct-mounted synchronous condenser device and system. In this device, the end of the cable winding can be formed into a stator armature winding using a cable joint, or the cable winding can be formed into a stator armature winding using a jointless cable that is directly bent. For both structures, the end winding, including the joint, is entirely contained within the stator cavity by increasing the stator volume. Having the end winding, including the joint, entirely contained within the stator cavity increases safety.
[0023] 3. This utility model provides a direct-connected synchronous condenser device and system. This system eliminates the need for a step-up transformer; the stator of the direct-connected synchronous condenser is directly connected to the busbar via a step-up substation switch. The direct-connected synchronous condenser device offers enhanced short-circuit ratio, subtransient reactive power compensation, and strong short-circuit capacity support. Under the same grid demand, a low-capacity direct-connected synchronous condenser device can replace a higher-capacity conventional synchronous condenser-transformer group. This allows for a more efficient start-up method, further saving costs and reducing floor space. Furthermore, the station or plant power supply is connected to the primary winding of the excitation transformer, and the secondary winding of the excitation transformer is connected to the excitation controller. The output of the excitation controller is connected to the rotor slip ring of the direct-connected synchronous condenser device. Excitation voltage and current are provided to the rotor of the direct-connected synchronous condenser device via station or plant power supply instead of the stator busbar. Compared to existing synchronous condenser systems, this reduces costs and floor space. This synchronous condenser system achieves the effects of cost reduction, shortened infrastructure construction, and shorter commissioning cycles. Attached Figure Description
[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0025] Figure 1 This is a partial structural schematic diagram of the direct-mounted synchronous condenser device provided in a specific embodiment of this utility model;
[0026] Figure 2 This is a schematic diagram of the structure of the direct-mounted phase converter device provided in a specific embodiment of this utility model;
[0027] Figure 3 This is a schematic diagram of the structure of the camera adjustment system provided in a specific embodiment of this utility model;
[0028] Figure 4 This is a flowchart of the startup method of the camera adjustment system provided in a specific embodiment of this utility model.
[0029] In the picture:
[0030] 1. Stator core; 2. Cable; 3. Interlayer insulator; 4. Spacer block; 5. Limiting arc groove; 6. First limiting ramp; 7. Groove bottom pad;
[0031] 100. Direct-connected synchronous condenser; 200. Switch; 300. Excitation controller; 400. Excitation transformer; 500. Frequency converter; 600. Starter motor; 700. Lubrication system. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.
[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0035] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0036] See Figure 1-4 This invention provides a direct-mounted synchronous condenser device and system. The direct-mounted synchronous condenser device includes a stator core 1, cable windings, multiple interlayer insulators 3, and multiple spacers 4. The stator core 1 has multiple rectangular slots spaced along its circumference. The cable windings are wound around the stator core 1 and include multiple cables 2. Each slot can accommodate multiple layers of cables 2. An interlayer insulator 3 is provided between each pair of adjacent cable layers 2. The spacers 4 abut against the cable 2 and the inner wall of the slot on both sides. The spacers 4 are located between two adjacent interlayer insulators 3. The multiple spacers 4 in each slot correspond one-to-one with the multiple layers of cables 2 in each slot.
[0037] In this direct-mounted synchronous condenser, each slot contains multiple layers of cable 2, and an interlayer insulator 3 is placed between every two adjacent cables 2 to improve insulation stability. The length of the pad 4 is the same as the length of the cable 2 within the slot. The upper and lower sides of the pad 4 contact and abut against two interlayer insulators 3, and the left and right sides of the pad 4 contact and abut against one sidewall of the cable 2 and the slot, respectively, thus fixing the position of the cable 2 within the slot. Because one end of the slot has an opening, this direct-mounted synchronous condenser can use a layer-by-layer installation method when installing the cable windings. One layer of cable 2, one interlayer insulator 3, another layer of cable 2, and another interlayer insulator 3 can be sequentially filled into the slot, and this process is repeated cyclically. This results in high installation efficiency and reduces wear on the cable 2. It is understandable that installing the pad 4 between the steps of installing the cable 2 and the interlayer insulator 3 helps to fix the position of the cable 2. This direct-mounted synchronous condenser can achieve radial overall installation of the cable windings while maintaining good grounding and fixation of the cable windings.
[0038] Optionally, the edges of the pad 4 are chamfered instead of right angles, which makes it easier to install the pad 4 and prevents the pad 4 from injuring the operator or the cable 2.
[0039] Optionally, a first limiting ramp 6 is provided on both sides of the interlayer insulator 3. The first limiting ramp 6 has a first arc segment and a first straight segment, and the cable 2 can fit into the first arc segment of two adjacent interlayer insulators 3. It is equivalent to the cable 2 being embedded in the first limiting ramp 6. The first limiting ramp 6 on both sides of the interlayer insulator 3 limits the cable 2 on both sides of the interlayer insulator 3, which can make the cable 2 move towards the side of the tooth groove, thus securing the cable 2.
[0040] The radius of the first arc segment is less than π / 2, and the radius corresponding to the first arc segment is the same as the radius of cable 2. This ensures that the volume of cable 2 embedded in the interlayer insulation 3 is not too large, thus saving costs.
[0041] Optionally, each tooth groove has multiple limiting arc-shaped grooves 5 on its inner wall. The cable 2 can fit against the groove wall of the limiting arc-shaped groove 5. The multiple limiting arc-shaped grooves 5 on the inner wall of each tooth groove correspond one-to-one with the multi-layer cable 2. This is equivalent to the cable 2 being embedded in the limiting arc-shaped groove 5. The number of limiting arc-shaped grooves 5 in the tooth groove is the same as the number of layers of cable 2 in the tooth groove, and they correspond one-to-one. This ensures good contact between the cable winding and the stator core 1, and also restricts the position of the cable 2.
[0042] The curvature of the limiting arc groove 5 is less than π, and the radius corresponding to the curvature of the limiting arc groove 5 is consistent with the radius of the cable 2, ensuring that the part of the cable 2 embedded in the stator core 1 is not too large, thus saving costs.
[0043] Optionally, the pad 4 is made of insulating material, which can increase insulation stability.
[0044] Optionally, the direct-mounted synchronous condenser device also includes multiple slot bottom pads 7, which are disposed between the bottom of the slot and the bottommost cable 2, with each slot bottom pad 7 corresponding to a slot.
[0045] Optionally, the bottom pad 7 is provided with a second limiting ramp, which has a second arc segment and a second straight segment, so that the bottommost cable 2 can fit against the second arc segment of the bottom pad 7. Each toothed groove is provided with a bottom pad 7, the bottom surface of which is flat and fits against the bottom of the groove. The other side of the bottom pad 7 is provided with a second limiting ramp for limiting the cable 2.
[0046] The radius of the second arc segment is less than π / 2, and the radius corresponding to the second arc segment is the same as the radius of cable 2. This ensures that the volume of cable 2 embedded in the bottom pad 7 of the groove is not too large, thus saving costs.
[0047] Optionally, the ends of the cable windings and cable 2 connectors are both located inside the stator bore.
[0048] The end of the cable winding can be formed by a cable 2 connector to form a stator armature winding, or the cable winding can be formed by directly bending a connectorless cable 2. For both of the above structures, the end winding, including the connector, is completely located inside the stator cavity by increasing the stator volume.
[0049] In existing stator cable-wound motors, the cable windings within the stator core slots extend directly to the outside of the unit, achieving winding connections outside the bore. While this method is simple to manufacture, the main insulation is located outside the unit, significantly increasing the risk to personnel and equipment in the event of a fault. The direct-connected synchronous condenser device in this embodiment, however, places all end windings, including the connectors, within the stator bore, enhancing safety.
[0050] The cable winding of this direct-mounted synchronous condenser adopts a layer-by-layer winding method. First, a slot bottom pad 7 is installed in each tooth slot. The bottom layer of cables 2 is wound along the rotor radially. The cables 2 are then moved to one side of the limiting arc groove so that they fit against the groove wall. A pad 4 is then installed along the rotor radially. The pad 4 and the cables 2 are placed side by side and abut against each other. The cables 2 are located between the pad 4 and the limiting arc groove 5 to ensure good contact between the cable winding and the stator core 1 and the slot bottom pad 7. Next, the interlayer insulator 3 is installed in each tooth slot and the cables 2 are wound in a cyclical manner. The pad 4 is then installed. The winding work is completed layer by layer in this way.
[0051] The present invention also provides a synchronous condenser system, including the aforementioned direct-connected synchronous condenser device 100. The direct-connected synchronous condenser device 100 is directly connected to the busbar via a step-up substation switch 200 without a transformer. It also includes a starter motor 600, a frequency converter 500, and the step-up substation switch 200. The rotor of the direct-connected synchronous condenser device 100 is connected to the rotor of the starter motor 600 via a coupling. The stator side of the starter motor 600 is connected to the output terminal of the frequency converter 500. The starter motor 600 is mounted on the slip ring side of the rotor of the direct-connected synchronous condenser device 100.
[0052] The synchronous condenser system omits the step-up transformer, and the stator of the direct-connected synchronous condenser device 100 is directly connected to the busbar via the step-up station switch 200.
[0053] The direct-connected synchronous condenser unit 100 has strong short-circuit ratio improvement, subtransient reactive power compensation and short-circuit capacity support capabilities. Under the same grid demand, a low-capacity direct-connected synchronous condenser unit 100 can replace a set of higher-capacity conventional synchronous condenser-transformer units. At this time, the start-up method can be adopted to further save costs and reduce the footprint.
[0054] Optionally, the synchronous condenser system also includes an excitation transformer 400 and an excitation controller 300. The station power or plant power is connected to the primary winding of the excitation transformer 400, the secondary winding of the excitation transformer 400 is connected to the excitation controller 300, and the output terminal of the excitation controller 300 is connected to the rotor slip ring of the direct-connected synchronous condenser device 100.
[0055] The rotor of the direct-connected synchronous condenser 100 is supplied with excitation voltage and current via station or plant power supply instead of the stator busbar. This reduces costs and floor space compared to existing synchronous condenser systems.
[0056] Currently, existing synchronous condensers all use a self-excited method, which uses a transformer connected to the stator port of the synchronous condenser on the primary side to achieve rotor excitation control. This method will add a high-voltage, large-capacity excitation transformer 400, which will increase the overall construction cost and footprint.
[0057] The startup method is as follows: First, turn on the lubricating oil system 700. When the lubricating oil pressure meets the requirements, turn on the frequency converter 500. The output terminal of the frequency converter 500 supplies power to the stator of the starter motor 600. When the rotor of the starter motor 600 drives the rotor of the synchronous condenser to reach and maintain the rated speed, adjust the output of the excitation controller 300 to ensure that the output voltage of the synchronous condenser and the voltage of the grid bus reach the condition of synchronous closing, so as to realize grid connection.
[0058] This synchronous condenser system can reduce costs, shorten infrastructure construction, and shorten the commissioning cycle.
[0059] Obviously, the above-disclosed embodiments of the present invention are merely for illustrating the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to specific implementations. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. It is neither necessary nor possible to exhaustively describe all implementation methods here.
Claims
1. A direct-mounted synchronous condenser device, characterized in that, include: Stator core (1), wherein the stator core (1) is provided with a plurality of rectangular teeth at intervals along the circumferential direction; The cable winding is wound around the stator core (1) and includes multiple cables (2), each slot of which can accommodate multiple layers of cables (2). Multiple interlayer insulators (3), with an interlayer insulator (3) between each pair of adjacent cable layers (2); Multiple pads (4) are provided, with the two sides of each pad abutting against the inner wall of the cable (2) and the tooth groove respectively. The pads (4) are located between two adjacent interlayer insulators (3). The multiple pads (4) in each tooth groove are arranged one-to-one with the multilayer cable (2) in each tooth groove.
2. The direct-mounted synchronous condenser device according to claim 1, characterized in that: The interlayer insulator (3) is provided with a first limiting ramp (6) on both sides. The first limiting ramp (6) has a first arc segment and a first straight segment. The cable (2) can fit with the first arc segment of the two adjacent interlayer insulators (3).
3. The direct-mounted synchronous condenser device according to claim 1, characterized in that: Each tooth groove has multiple limiting arc grooves (5) on its inner wall. The cable (2) can fit into the groove wall of the limiting arc groove (5). The multiple limiting arc grooves (5) on the inner wall of each tooth groove correspond one-to-one with the multilayer cable (2).
4. The direct-mounted synchronous condenser device according to claim 1, characterized in that: The pad (4) is made of insulating material.
5. The direct-mounted synchronous condenser device according to claim 1, characterized in that: It also includes multiple bottom pads (7), which are set between the bottom of the toothed groove and the bottommost cable (2). The multiple bottom pads (7) are set one-to-one with the multiple toothed grooves.
6. The direct-mounted synchronous condenser device according to claim 5, characterized in that: The bottom pad (7) of the trough is provided with a second limiting slope, which has a second arc segment and a second straight segment. The bottom cable (2) can fit with the second arc segment of the bottom pad (7).
7. The direct-mounted synchronous condenser device according to claim 1, characterized in that: The ends of the cable windings and the cable (2) joints are both located inside the stator bore.
8. A camera adjustment system, characterized in that: The device includes a direct-connected synchronous condenser (100) as described in any one of claims 1-7, wherein the direct-connected synchronous condenser (100) is directly connected to the busbar via a switch (200) of the booster station, and further includes a starter motor (600), a frequency converter (500) and a booster station switch (200). The rotor of the direct-connected synchronous condenser (100) is connected to the rotor of the starter motor (600) via a coupling, and the stator side of the starter motor (600) is connected to the output terminal of the frequency converter (500).
9. The synchronous condenser system according to claim 8, characterized in that: The starter motor (600) is installed on the slip ring side of the rotor of the direct-mounted synchronous condenser (100).
10. The synchronous condenser system according to claim 8, characterized in that: It also includes an excitation transformer (400) and an excitation controller (300). The station power or plant power is connected to the primary winding of the excitation transformer (400), the secondary winding of the excitation transformer (400) is connected to the excitation controller (300), and the output end of the excitation controller (300) is connected to the rotor slip ring of the direct-connected synchronous condenser (100).