CN115274274A - Offshore station test transformer - Google Patents
Offshore station test transformer Download PDFInfo
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- CN115274274A CN115274274A CN202210967994.9A CN202210967994A CN115274274A CN 115274274 A CN115274274 A CN 115274274A CN 202210967994 A CN202210967994 A CN 202210967994A CN 115274274 A CN115274274 A CN 115274274A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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Abstract
The utility model relates to an offshore station test transformer, set up in offshore station, offshore station test transformer includes the iron core, first switch, the second switch and around locating the primary winding on the iron core, first winding and second winding, the head end of primary winding is used for inserting voltage, the head end of the first winding of end connection of primary winding, the end connection neutral point of first winding, first switch and second switch all include more than two movable contact, the movable contact of each first switch corresponds and connects a tap that first winding is drawn forth in different positions department, the second winding is connected to the stationary contact of first switch, the movable contact of each second switch corresponds and connects a tap that the second winding is drawn forth in different positions department, the stationary contact of second switch is used for output voltage. The offshore station testing transformer is arranged in the offshore station, potential safety hazards caused by long-distance power transmission are avoided, the space utilization rate of the winding can be improved, and the offshore station testing transformer has the advantages of compact structure and reliable work.
Description
Technical Field
The application relates to the technical field of transformers, in particular to an offshore station test transformer.
Background
The basic trend of global energy transformation is the transformation from a fossil energy system to a low-carbon energy system, and finally the transformation enters a sustainable energy era mainly based on renewable energy. Wind energy is a new renewable clean energy source, has considerable total amount, and is more and more concerned by power systems. The offshore wind power engineering comprises a plurality of electrical devices, and tolerance tests and the like of different voltage levels need to be carried out on the electrical devices so as to guarantee the performance of the electrical devices.
Because the requirement on the voltage level difference of a power supply system of the offshore station is high, the traditional method for providing different voltage test power supplies for offshore wind power engineering is that after the construction of a land station is completed, the power supply is sent out from the land station to the offshore station. However, offshore wind power projects are usually far away from continents, the construction period is long, the cost is high, after the onshore station completes construction, the whole project period is pushed back by more than half a year, the output of green and low-carbon wind power energy is slowed down, resources are not fully utilized, and the influence of various factors is easily caused in the long-distance power transmission process, so that the power transmission success rate is low.
Disclosure of Invention
In view of the above, it is necessary to provide a transformer for offshore station testing.
A transformer for testing an offshore station is arranged in the offshore station and comprises an iron core, a primary winding, a first winding, a second winding, a first switch and a second switch, wherein the primary winding, the first winding and the second winding are wound on the iron core, the head end of the primary winding is used for being connected with voltage, the tail end of the primary winding is connected with the head end of the first winding, and the tail end of the first winding is connected with a neutral point;
the first switch and the second switch both comprise more than two movable contacts, the movable contact of each first switch is correspondingly connected with a tap led out from different positions of the first winding, the fixed contact of the first switch is connected with the second winding, the movable contact of each second switch is correspondingly connected with a tap led out from different positions of the second winding, and the fixed contact of the second switch is used for outputting voltage.
In one embodiment, the first winding includes more than two coarse tuning sub-windings, each of the coarse tuning sub-windings is connected in series, one end of the series connection is connected to the tail end of the primary winding, the other end of the series connection is connected to the neutral point, and the first winding takes one coarse tuning sub-winding as a minimum unit to lead out more than two taps.
In one embodiment, the number of turns of each coarse tune winding is equal.
In one embodiment, the total number of electrical turns of the second winding is equal to the number of electrical turns of one of the coarse sub-windings.
In one embodiment, the controller is further included, and the first switch and the second switch are both connected to the controller.
In one embodiment, the controller is configured to obtain an initial physical parameter of the offshore station test transformer, obtain a real-time physical parameter of the offshore station test transformer after the offshore station test transformer is loaded with a load, and obtain a reliability evaluation result of the offshore station test transformer according to the real-time physical parameter.
In one embodiment, the controller is further configured to, when it is detected that a test article is inserted into the second switch, adjust the movable contact that is in communication with the fixed contact of the first switch, and then adjust the movable contact that is in communication with the fixed contact of the second switch.
In one embodiment, the transformer further comprises a voltage stabilizing winding, and the voltage stabilizing winding is wound on the iron core.
In one embodiment, one voltage regulating module comprises one first winding, one second winding, one first switch and one second switch, the offshore station test transformer comprises three voltage regulating modules, and the tail end of the first winding in each voltage regulating module is connected with a neutral point.
In one embodiment, the power supply further comprises a reactive element connected to the neutral point.
The offshore station testing transformer is arranged on an offshore station and comprises an iron core, a primary winding, a first winding, a second winding, a first switch and a second switch, wherein the primary winding, the first winding and the second winding are wound on the iron core, the head end of the primary winding is used for accessing voltage, the tail end of the primary winding is connected with the head end of the first winding, the tail end of the first winding is connected with a neutral point, the first switch and the second switch respectively comprise more than two movable contacts, the movable contacts of the first switches are correspondingly connected with taps led out of the first winding at different positions, the static contact of the first switch is connected with the second winding, the movable contacts of the second switches are correspondingly connected with taps led out of the second winding at different positions, and the static contact of the second switch is used for outputting voltage. The offshore station testing transformer is arranged at an offshore station, can be constructed at the onshore station, provide voltage for a tested product at sea, the waiting period is shortened, potential safety hazards caused by long-distance power transmission are avoided, in addition, the offshore station testing transformer can realize first-level voltage regulation through the first switch and the first winding, second-level voltage regulation can be realized through the second switch and the second winding, the offshore station testing transformer is enabled to have wide voltage output, debugging testing power supplies with different voltage levels can be provided, the offshore station testing transformer is based on the connection relation of the first winding and the second winding, the winding space utilization rate can be improved, and the offshore station testing transformer has the advantages of compact structure and reliable work.
Drawings
FIG. 1 is a schematic diagram of the structure of an offshore station test transformer in one embodiment;
FIG. 2 is a schematic diagram of a winding arrangement for an offshore station test transformer in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
In one embodiment, an offshore station test transformer is provided, which is disposed at an offshore station, as shown in fig. 1, the offshore station test transformer includes an iron core, a primary winding 120, a first winding 100, a second winding 200, a first switch 300, and a second switch 400, the primary winding 120, the first winding 100, and the second winding 200 are all wound on the iron core, a head end of the primary winding 120 is used for accessing a voltage, a tail end of the primary winding 120 is connected to a head end of the first winding 100, a tail end of the first winding 100 is connected to a neutral point, each of the first switch 300 and the second switch 400 includes more than two movable contacts, each movable contact of the first switch 300 is correspondingly connected to one tap led out by the first winding 100 at different positions, a stationary contact of the first switch 300 is connected to the second winding 200, each movable contact of the second switch 400 is correspondingly connected to one tap led out by the second winding 200 at different positions, and a stationary contact of the second switch 400 is used as a voltage output terminal of the offshore station test transformer for outputting a voltage.
The offshore station testing transformer is arranged in an offshore station, can be built in the onshore station, and can provide voltage for a tested product at sea, so that the waiting period is shortened, and potential safety hazards caused by long-distance power transmission are avoided. When the offshore station test transformer is designed, the capacity of the offshore station test transformer can be determined as the highest test capacity of the offshore station, so that the voltage requirements of more occasions can be met. Generally, the maximum test capacity of the offshore station is 30000-60000kVA, for example, 45000kVA can be selected, and the application range is wide.
In particular, the offshore station refers to a base constructed on the sea, such as an offshore wind power plant, and the like. The offshore station test transformer comprises an iron core, a primary winding 120, a first winding 100, a second winding 200, a first switch 300 and a second switch 400, wherein the primary winding 120, the first winding 100 and the second winding 200 are wound on the iron core, and specifically, the primary winding 120, the first winding 100 and the second winding 200 can be wound on different positions of the iron core respectively and used for generating electromagnetic induction with the iron core, completing electromagnetic conversion, transmission and the like. The first end and the last end of the primary winding 120 refer to two ends of an integral winding when the primary winding 120 is regarded as the integral winding, and when one of the two ends is defined as the first end, the other end is the last end, and the specific sequence is not limited. The head end of the primary winding 120 is used for accessing voltage and generally accessing system voltage, the tail end of the primary winding 120 is connected with the head end of the first winding 100, the tail end of the first winding 100 is connected with a neutral point, the primary winding 120 is connected with the coarse tuning sub-winding positioned at the head end in series, the coarse tuning sub-winding positioned at the head end is accessed with voltage through the primary winding 120, the primary winding 120 and each coarse tuning sub-winding are matched to work, and the primary winding 120 and the first winding 100 are used as the primary side of the test transformer of the offshore station, so that the basic function of the transformer can be realized. The rated voltage of the offshore generator can be selected according to the rated voltage of the primary side, so that the offshore station test transformer can be matched with most offshore generators for use, the power is not required to be taken from the land station wiring, and the use is convenient.
The first switch 300 and the second switch 400 each include more than two movable contacts, and the fixed contacts of the first switch 300 and the second switch 400 can be conducted with different movable contacts to switch different conduction paths. When the stationary contacts of the first switch 300 and the second switch 400 are conducted with different movable contacts, different turns of the second winding 200 can be connected between the second switch 400 and the first switch 300, and different turns of the first winding 100 can be connected between the first switch 300 and a neutral point, so that the offshore station test transformer can output different voltages, two-stage voltage regulation can be realized through the first winding 100 and the second winding 200, and the voltage regulation range is expanded. In addition, the first winding 100 of the offshore station test transformer can comprise a part of series windings and a part of common windings, so that the transformer can be self-coupled, the space utilization rate is improved, the size of the offshore station test transformer is reduced, and the compact structure of the offshore station test transformer is improved. The types of the first switch 300 and the second switch 400 are not exclusive and may be, for example, a set of ganged load switches or others, as long as the skilled person recognizes that this can be achieved.
In one embodiment, as shown in fig. 1, the first winding 100 includes more than two coarse tuning sub-windings, each coarse tuning sub-winding is connected in series, one end of the series connection is connected to the end of the primary winding 120, the other end of the series connection is connected to the neutral point, and the first winding 100 takes one coarse tuning sub-winding as the minimum unit to draw more than two taps.
When the first winding 100 includes two or more coarse sub-windings connected in series, one end of the first winding is connected to the end of the primary winding 120, and the other end of the first winding is connected to the neutral point as the end of the first winding 100. Further, the first winding 100 may draw more than two taps with one coarse tuning sub-winding as the minimum unit, that is, when the first switch 300 switches different moving contacts conducting with the fixed contact, the number of coarse tuning sub-windings connected between the first switch 300 and the neutral point may be adjusted, and the number of turns of one coarse tuning sub-winding is the minimum unit of adjustment. The number of the coarse tuning sub-windings is not unique, and it is assumed that N coarse tuning sub-windings are provided, in this embodiment, the first windings 100 are arranged into 1, 2, and 3 … … N groups of common winding structures, and each coarse tuning sub-winding is integrally switched during secondary side voltage regulation to complete function conversion between the common winding and the series winding. The main air channel is a gap between connection points of the series windings and the common winding, for example, when the secondary side is connected with the coarse tuning sub-winding 2 and the coarse tuning sub-winding 3 … … and the coarse tuning sub-winding N, the main air channel is between the coarse tuning sub-winding 1 and the coarse tuning sub-winding 2, and when the secondary side is connected with the coarse tuning sub-winding 3 and the coarse tuning sub-winding 4 … … and the coarse tuning sub-winding N, the main air channel is between the coarse tuning sub-winding 2 and the coarse tuning sub-winding 3, and the maximum position of spatial magnetic leakage is located between the main air channels, so that the spatial magnetic field energy and the winding stress trend are controlled by controlling the magnetic leakage of the main air channel. Therefore, one coarse tuning sub-winding is used as a switching unit, different numbers of coarse tuning sub-windings are connected, only the leakage flux of the main air channel is translated in the radial direction, local distortion cannot be caused, and the working performance of the offshore station test transformer can be improved.
Further, in one embodiment, the number of turns in each coarse sub-winding is equal. When the number of turns of each coarse tuning sub-winding is equal, if the switching between one movable contact of the first switch 300 and the adjacent other movable contact is a gear, the number of turns of the first switch 300 can be the same when switching each gear, and the voltage regulating amplitude is the same. The first winding 100 is arranged into 1, 2 and 3 … … N groups of common winding structures, the first winding 100 takes a coarse tuning sub-winding as a minimum unit in an electrical wiring diagram, each coarse tuning sub-winding is integrally switched during secondary side voltage regulation, function conversion of the common winding and a series winding is completed, magnetic leakage distribution in a main air channel under each stage of operation state is basically consistent, uniform magnetic leakage distribution effect is realized, and the working reliability of the offshore station test transformer is further improved.
In one embodiment, the total electrical turns of the second winding 200 is equal to the physical turns of one of the coarse sub-windings. In particular, electrical turns refer to the number of turns put into use, and physical turns refer to all the turns present. When the total electrical turn of the second winding 200 is equal to the physical turn of one coarse sub-winding, a round of voltage regulation of the second winding 200 is considered to be completed when the second switch 400 switches different moving contacts, in particular all moving contacts of the second winding 200, so that the electrical turn changes from 0 to the total electrical turn. Then, the first switch 300 can be switched to another moving contact of the first winding 100 to realize voltage regulation in another value range, thereby realizing the continuity of voltage regulation.
For example, when the total electrical turn number of the second winding 200 is 10 turns, the physical turn number of a coarse tuning sub-winding is also 10 turns, when the first switch 300 is currently connected to a coarse tuning sub-winding, assuming that the output voltage is 10V, the number of turns connected to the second winding 200 is switched to 0 to 10 by adjusting different gear positions of the second switch 400, so that the output voltage is changed from 10V to 20V, and when the total electrical turn number of the second winding 200 is already equal to the physical turn number, the first switch 300 is switched to the next gear position, for example, two coarse tuning sub-windings are connected to make the output voltage be 20V, and then different gear positions of the second switch 400 are switched to realize voltage regulation output in the range of 20-30V. Therefore, the output voltage of the offshore station test transformer can be more continuous, and more voltage can be provided.
In one embodiment, the offshore station test transformer further comprises a controller, and the first switch 300 and the second switch 400 are both connected to the controller. When the offshore station test transformer further comprises a controller, the first switch 300 and the second switch 400 may be electric switches, and both the first switch 300 and the second switch 400 are connected to the controller, and may automatically switch on or off operating states under the control of the controller. In addition, the controller can also control the static contacts of the first switch 300 and the second switch 400 to be conducted with different movable contacts, so that voltages with different sizes are output, and the automation degree of the offshore station test transformer is improved.
Specifically, the type of the controller is not unique, and the controller may include various processing chips and peripheral circuits thereof, and has a logic operation function, and the processing chip may be a single chip microcomputer, a DSP (Digital Signal processing) chip, or an FPGA (Field Programmable Gate Array) chip. The controller may also be a stand-alone computer or a cluster of computers. The controller can control and adjust the conduction states of the first switch 300 and the second switch 400 according to the received instruction, for example, when the controller receives a target voltage value, the number of turns of the electric appliances to be put into use of the first winding 100 and the second winding 200 is calculated according to the target voltage value, the pre-stored structures of the first winding 100, the second winding 200, the first switch 300 and the second switch 400, the connection relationship between the first switch 300 and the first winding 100, the connection relationship between the second switch 400 and the second winding 200 and the like are combined, the target movable contact to be conducted by the first switch 300 and the target movable contact to be conducted by the second switch 400 are determined, the first switch 300 and the second switch 400 are controlled to conduct the fixed contact and the target movable contact, so that the transformer for the offshore station test does not need manual intervention, the target voltage is automatically output, and the operation is convenient.
In one embodiment, the controller is used for acquiring initial physical parameters of the offshore station test transformer, acquiring real-time physical parameters of the offshore station test transformer after the offshore station test transformer is loaded, and acquiring a reliability evaluation result of the offshore station test transformer according to the real-time physical parameters. The reliability evaluation result can be used as an important basis for subsequent design or improvement of the offshore station test transformer, and the working reliability of the offshore station test transformer can be guaranteed.
Specifically, the initial physical parameters of the offshore station test transformer include one or more of the number of turns, the wire diameter size, the setting position, the position of the main air channel, and the material and size of the iron core of the first winding 100 and the second winding 200, and further include the type, connection relationship, and the like of the first switch 300 and the second switch 400. And then, the controller acquires real-time physical parameters of the offshore station test transformer after the offshore station test transformer is loaded with the load. Here, the offshore station test transformer loaded with the load may be a real offshore station test transformer, or may be a transformer simulation model or a theoretical model constructed to correspond to the offshore station test transformer. The loading load may be determined according to the load that the marine station test transformer may be subjected to in actual operation, and may be, for example, input voltage, current, temperature and applied force, etc. The method comprises the steps of obtaining real-time physical parameters of the offshore station test transformer after the offshore station test transformer is loaded with a load, namely obtaining the real-time physical parameters of the offshore station test transformer influenced by the load after the offshore station test transformer is loaded with the load. Then, a reliability evaluation result of the marine station test transformer is obtained according to the real-time physical parameters, for example, if it is obtained that the temperatures of the first winding 100 and the second winding 200 are too high after the voltage of the marine station test transformer is loaded, it is considered that the temperature abnormality may be caused by too large currents flowing through the first winding 100 and the second winding 200 due to improper wire diameter selection of the first winding 100 and the second winding 200. Therefore, the working personnel can be guided to adjust the wire diameter so as to improve the working performance of the offshore station test transformer. It can be understood that, in other embodiments, the initial physical parameter, the load, the real-time physical parameter, and the reliability evaluation result may also be adjusted according to the actual situation, and are not described herein again.
In one embodiment, the controller is further configured to adjust the movable contact in communication with the stationary contact of the first switch 300 and then adjust the movable contact in communication with the stationary contact of the second switch 400 when the test sample is detected to be inserted at the stationary contact of the second switch 400. Generally, the first winding 100 is a coarse adjustment winding, the second winding 200 is a fine adjustment winding, and when the controller detects that the to-be-tested object is connected to the stationary contact of the second switch 400, it is considered that the transformer for the offshore station test needs to output voltage to the to-be-tested object at this time. At this time, the controller first adjusts the movable contact that is in conduction with the stationary contact of the first switch 300, and then adjusts the movable contact that is in conduction with the stationary contact of the second switch 400, that is, the tapping position of the first switch 300 is first adjusted, and then the tapping position of the second switch 400 is adjusted, so as to realize step-by-step adjustment of the output voltage, which is beneficial to improving the stability of the output voltage and also capable of improving the voltage regulation efficiency.
In one embodiment, as shown in fig. 2, the offshore station test transformer further includes a voltage stabilizing winding 500, and the voltage stabilizing winding 500 is wound around the iron core. The voltage stabilizing winding 500 is wound on the iron core, so that a filtering effect can be achieved, harmonic waves generated in the working process of the offshore station test transformer are filtered, and the working performance of the offshore station test transformer is improved.
In one embodiment, a voltage regulating module comprises a first winding 100, a second winding 200, a first switch 300 and a second switch 400, the offshore station test transformer comprises three voltage regulating modules, and the ends of the first winding 100 in each voltage regulating module are connected with a neutral point. Specifically, one voltage regulating module is a phase, the offshore station test transformer comprises three voltage regulating modules, namely the offshore station test transformer is a three-phase transformer, the stationary contact of the second switch 400 in each voltage regulating module is used for outputting voltage, the tail end of the first winding 100 in each voltage regulating module is connected with a neutral point, the three voltage regulating modules are connected in a star shape, three-phase voltage can be output, and universality is good.
Further, when the offshore station test transformer comprises three voltage regulating modules, the number of the voltage stabilizing windings 500 can be three, the three voltage stabilizing windings 500 are wound on the iron core, and the three voltage stabilizing windings 500 are connected end to form a triangular connection, so that third harmonic can be filtered, and the working reliability of the offshore station test transformer is improved.
In one embodiment, the offshore station test transformer further comprises a reactive element connected to the neutral point. When the neutral point is connected with the reactance element, the reactance element can limit zero sequence short-circuit current in the offshore station test transformer, and the safety performance of the offshore station test transformer is improved.
The offshore station testing transformer is arranged in an offshore station, and comprises an iron core, a primary winding 120, a first winding 100, a second winding 200, a first switch 300 and a second switch 400, wherein the primary winding 120, the first winding 100 and the second winding 200 are wound on the iron core, the head end of the primary winding 120 is used for accessing voltage, the tail end of the primary winding 120 is connected with the head end of the first winding 100, the tail end of the first winding 100 is connected with a neutral point, the first switch 300 and the second switch 400 respectively comprise more than two movable contacts, the movable contact of each first switch 300 is correspondingly connected with a tap led out by the first winding 100 at different positions, the stationary contact of the first switch 300 is connected with the second winding 200, the movable contact of each second switch 400 is correspondingly connected with a tap led out by the second winding 200 at different positions, and the stationary contact of the second switch 400 is used as a voltage output end of the offshore station testing transformer and used for outputting voltage. The offshore station testing transformer is arranged at an offshore station, can be constructed at the onshore station, and provides voltage for a tested product at sea, so that the waiting period is shortened, and potential safety hazards caused by long-distance power transmission are avoided.
For a better understanding of the above embodiments, the following detailed description is given in conjunction with a specific embodiment. In one embodiment, the application provides an offshore station test transformer for a full-range wide-width small-step voltage regulation test for offshore wind power regulation aiming at importance and urgency of offshore wind power engineering construction. The offshore station test transformer is used before offshore wind power is sent out of an engineering land station and is not completed, and is supplied with debugging test power supplies with different voltage levels. The offshore station test transformer has the characteristics of test capacity coverage, wide voltage regulation, small step voltage regulation, simple and reliable structure and the like, and can be widely popularized and applied.
Specifically, when designing the offshore station test transformer, the key physical parameters of the offshore station test transformer are determined firstly, including rated capacity, primary side rated voltage, secondary side voltage regulation range, secondary side voltage regulation step length, performance requirements and the like. The offshore station test transformer comprises an iron core, a first winding 100, a second winding 200, a first switch 300, a second switch 400, a voltage stabilizing winding 500 and reactance elements, wherein the number of voltage regulating modules isAnd thirdly, the offshore station test transformer adopts a three-phase structure and can output three-phase stable voltage. The capacity of the offshore station test transformer is the highest test capacity of the offshore station, so that the voltage requirement of most tested products can be met. Rated voltage U of offshore generator is selected according to rated voltage at primary side of offshore station test transformer N The electricity can be obtained from an offshore generator. The offshore station test transformer can basically cover all test voltage requirements of all offshore stations, is realized by debugging and testing a transformer voltage regulating system without being adjusted by other equipment, and determines a secondary side voltage regulating range and a voltage regulating step length on the basis of the debugging and testing transformer voltage regulating system.
The offshore station test transformer uses a quasi-auto-coupling structure and a thickness voltage regulating structure to realize a wide-width small-step voltage regulating function and carry out electromagnetic concept development. The self-coupling structure comprises a primary series winding and a secondary common winding, and can improve the space utilization rate of the windings and realize the purpose of compact offshore station. The first winding 100 is a coarse adjustment winding, the second winding 200 is a fine adjustment winding, the first switch 300 is a coarse adjustment load switch, the second switch 400 is a fine adjustment load switch, and the self-coupling-like structure means that the number of windings which can be accessed into the common winding can be selected according to requirements. The access number of the secondary windings is adjusted by the coarse load switch, the secondary windings comprise the second winding 200 accessed between the second switch 400 and the first switch 300 and the first winding 100 accessed between the first switch 300 and a neutral point, and the wide voltage regulation function is realized.
And the proportion of the minimum access winding turns of the fine-tuning winding to the primary side winding turns determines the minimum voltage-regulating step length of the test supply voltage of the test transformer. Wherein the primary winding includes all of the first windings 100. The number and the number of turns of the primary winding and the secondary winding, the total number of turns of the fine-tuning winding and the number of turns of each stage of voltage regulation are selected according to the test voltage requirement of the offshore station.
In the present embodiment, it is assumed that the minimum step size is λ U N (lambda is a small fixed percentage) and the number of voltage regulating turns per stage is N Z . When the regulating voltage level Num is 95 levels, a primary winding 120, a fine regulating winding and five groups of coarse regulating windings are arranged, and the total number of turns of the primary winding 120 and the fine regulating winding is 15N Z Each group of coarse tuning windings has 16N turns Z Then the correlation is calculated as:
total number of primary turns: sigma N 1 ＝(15+16×5)N Z ＝95N Z ；
Total number of secondary side turns: sigma N 2 ＝(15+16×5)N Z ＝95N Z ；
The voltage regulation range is as follows:
minimum voltage regulation step length:
the coarse tuning of the switch stage voltage is: Δ U = (16 × 1.0526%). U N ＝16.84％N Z ；
Therefore, the primary series winding, the N coarse adjustment windings and the fine adjustment winding are used, the larger the value of N is, the smaller the step size of coarse adjustment is, and the number of turns of the coarse adjustment winding is one step larger than that of the fine adjustment winding.
And then, building a concrete structure of the offshore station test transformer, wherein the concrete structure comprises a basic transformer structure, a special winding, a coarse-fine combined regulation on-load voltage-regulating switch system and the like, and realizing test variable-width small-step-size voltage regulation. The offshore station test transformer comprises a special winding and a coarse-fine combined regulation on-load tap changer system, namely a first winding 100, a second winding 200, a first switch 300 and a second switch 400, for realizing the offshore wind power wide-width small-step voltage regulation function, besides the basic structure of the conventional transformer, such as an oil tank, transformer oil, an iron core, a basic winding, an insulating material and a fastening installation structure.
The winding arrangement of the offshore station test transformer is shown in fig. 2, except for the fine adjustment winding, all the windings are connected in turn during operation, no tapping tap is arranged in the windings, the winding is schematically an integral structure, and the actual structure is a complex structure formed by multiple layers of radial or axial parallel winding. The stabilizing winding 500 functions to filter the third harmonic. The primary side winding of the offshore station test transformer comprises all the first windings 100, and when the offshore station test transformer further comprises the primary winding 120, the primary side winding of the offshore station test transformer comprises all the first windings 100 and the primary winding 120 and is connected to the system voltage. The secondary side winding of the offshore station test transformer comprises all the second windings 200 and the first windings 100 which are connected between the first switch 300 and a neutral point, and test voltage for offshore wind power debugging is output.
The wiring schematic diagram of the test transformer is shown in figure 1, when the tapping position of the coarse adjustment switch is connected with the neutral point position, the initial voltage of the wide voltage regulation range is 0%, when the tapping position of the coarse adjustment switch is connected with all the coarse adjustment windings, the sum of the turns of the fine adjustment windings is equal to the sum of the series windings, and the maximum voltage regulation range is 100% of primary voltage. The coarse and fine voltage regulation switches are comprehensively used, the number of windings and the number of turns can be optimized, and the full-range wide-width small-step voltage regulation is realized. The two independent on-load switches can be used for coarse adjustment and fine adjustment, and one coarse and fine adjustment can be used for linkage on-load voltage regulation to synchronize the fine adjustment process in the coarse adjustment process.
After the offshore station test transformer is built, the reliability of the characteristic physical quantity of the offshore station test transformer is demonstrated. The offshore station test transformer meets the requirements of specific capacity, voltage and current output, and is equally important for guaranteeing the reliability of equipment, and the offshore station test transformer is required to pass the reliability demonstration of sufficient physical parameters. The method comprises the following steps: the reliability of the transformer body and the used joint debugging switch in each field of an electric field, a magnetic field, a thermal field and a force field is considered, and the capability of enduring various special impacts under the working condition of the failure of the test sample is considered. The reliability can be demonstrated using a simulation calculation method that can select either mature dedicated software or general software that has been verified for correctness. The reliability can also be demonstrated by using a production test method, and under the condition permission, the voltage and capacity adjustment should be performed under the simulated offshore station test condition as much as possible, and the impact on the test transformer when the test article is damaged (such as voltage breakdown) is simulated.
When the offshore station test transformer is used, the offshore station test transformer is firstly temporarily installed on a reliable offshore platform. When the transformer is used in the offshore station test, firstly, the electrical parameters required to be input by the test equipment and the joint debugging device are determined, and the transformer is put into operation in a no-load mode and subjected to joint debugging to the test required voltage. The coarse on-load tap position may be adjusted first and then the fine tap position adjusted. Then, the test is carried out in a no-load operation mode, a zero lifting pressure is used for carrying out a pressure application test until the test outputs voltage, and a group of linked on-load switches can be used for carrying out equal gradient voltage regulation. And after one group of tests are finished, cutting off the first group of test samples when the step of the second test is carried out, and adjusting the secondary side voltage to the second test voltage to finish the second group of tests. In the case of multiple tests, the same analogy is followed. After all tests are finished, the secondary side wiring is preferably cut off, and then the primary side power supply is cut off, so that the influence of electromagnetic resonance on the test equipment and the joint debugging device is prevented.
Therefore, the offshore station test transformer can be used for offshore wind power projects, special requirements of various electrical element debugging tests of the offshore wind power offshore station on voltages of various levels are met, and temporary power supply of all equipment of the offshore station is achieved. And according to the relation between the rated voltage at the primary side and the debugging voltage of the offshore wind power, the design of key parameters of the offshore station test transformer with the full range, the wide range and the small step length is completed. On the basis of the basic structure of the transformer, the system voltage regulation function of the offshore station test transformer is realized through special winding arrangement, a connection mode and a coarse-fine combined regulation on-load voltage regulation switch. The technical guarantee of the offshore station test transformer comprises the consideration of the reliability of the transformer body and the used joint debugging switch in each field of an electric field, a magnetic field, a thermal field and a force field. The offshore station test transformer adopts a quasi-self-coupling structure to realize a compact target, adopts a fine-tuning structure to realize small-step voltage regulation, adopts a quasi-self-coupling and coarse-fine-tuning structure to be comprehensively applied to realize wide-range voltage regulation, and is also provided with an independent balance winding to filter third harmonic.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is specific and detailed, but not construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (10)
1. The offshore station test transformer is characterized by being arranged in an offshore station, and comprises an iron core, a primary winding, a first winding, a second winding, a first switch and a second switch, wherein the primary winding, the first winding and the second winding are wound on the iron core, the head end of the primary winding is used for being connected with voltage, the tail end of the primary winding is connected with the head end of the first winding, and the tail end of the first winding is connected with a neutral point;
the first switch and the second switch both comprise more than two movable contacts, the movable contact of each first switch is correspondingly connected with one tap led out from different positions of the first winding, the fixed contact of the first switch is connected with the second winding, the movable contact of each second switch is correspondingly connected with one tap led out from different positions of the second winding, and the fixed contact of the second switch is used for outputting voltage.
2. The offshore station test transformer of claim 1, wherein the first winding comprises more than two coarse tuning sub-windings, each of the coarse tuning sub-windings is connected in series, one end of the series connection is connected with the tail end of the primary winding, the other end of the series connection is connected with the neutral point, and the first winding is provided with more than two taps by taking one coarse tuning sub-winding as a minimum unit.
3. The offshore station test transformer of claim 2, wherein each of the coarse tuner windings has an equal number of turns.
4. The offshore station test transformer of claim 2, wherein a total electrical number of turns of said second winding is equal to an electrical number of turns of one of said coarse sub-windings.
5. The offshore station test transformer of claim 1, further comprising a controller, wherein the first switch and the second switch are each connected to the controller.
6. The offshore station test transformer of claim 5, wherein the controller is configured to obtain initial physical parameters of the offshore station test transformer, obtain real-time physical parameters of the offshore station test transformer after the offshore station test transformer is loaded, and obtain a reliability evaluation result of the offshore station test transformer according to the real-time physical parameters.
7. The offshore station test transformer of claim 5, wherein the controller is further configured to adjust the movable contact in communication with the stationary contact of the first switch and then the movable contact in communication with the stationary contact of the second switch upon detecting an access of a test item at the stationary contact of the second switch.
8. The offshore station test transformer of claim 1, further comprising a voltage stabilizing winding wound around the core.
9. The offshore station test transformer of claim 1, wherein one voltage regulation module comprises one of the first windings, one of the second windings, one of the first switches, and one of the second switches, wherein the offshore station test transformer comprises three of the voltage regulation modules, and wherein the ends of the first windings of the voltage regulation modules are connected to a neutral point.
10. The offshore station test transformer of claim 1, further comprising a reactive element connecting the neutral point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210967994.9A CN115274274A (en) | 2022-08-12 | 2022-08-12 | Offshore station test transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210967994.9A CN115274274A (en) | 2022-08-12 | 2022-08-12 | Offshore station test transformer |
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