CN217334816U - Large-capacity photovoltaic inversion and boosting integrated machine - Google Patents

Abstract

The utility model discloses a large capacity photovoltaic contravariant steps up all-in-one, including base, contravariant unit and the unit that steps up all locate on the base, the unit that steps up is arranged with contravariant unit interval and is connected through the copper bar, and the output of contravariant unit links to each other with the input of the unit that steps up; the high-voltage side of the boosting part uses a combined fuse which comprises two or more fusing modules connected in parallel, and each fusing module comprises at least one high-voltage current-limiting fuse. The transformer current-limiting full-range protection high-voltage current-limiting fuse can protect the over-current and short-circuit current conditions of a protected loop.

Description

Large-capacity photovoltaic inversion and boosting integrated machine

Technical Field

The utility model belongs to the technical field of power equipment, concretely relates to large capacity photovoltaic contravariant all-in-one that steps up.

Background

The inverter and booster all-in-one machine integrates the inverter, the booster transformer, the base, the data transmission unit and the like, so that the difficulty of early debugging and construction and the cost of later maintenance are reduced.

At present, the main current capacity of a single machine of an inversion boosting integrated machine of a domestic centralized photovoltaic power station is 3125kVA, and the high-voltage side of a boosting unit mostly adopts the voltage grade of 35 KV. However, with the further increase of market competition of photovoltaic power stations, the capacity of the inversion and boost all-in-one machine for the centralized photovoltaic power station is further expanded, and at present, the inversion and boost all-in-one machine is mainly limited by the rated current of a high-voltage side fuse, so that the inversion and boost all-in-one machine product with high cost performance is difficult to realize.

Disclosure of Invention

The utility model provides a large capacity photovoltaic contravariant all-in-one that steps up to the capacity of solving current contravariant all-in-one that steps up is limited in the problem of fuse rated current specification.

In order to achieve the purpose, the utility model relates to a high-capacity photovoltaic inversion and boosting integrated machine, which comprises a base, an inversion unit and a boosting unit, wherein the inversion unit and the boosting unit are both arranged on the base, the boosting unit and the inversion unit are arranged at intervals and are connected through a copper bar, and the output end of the inversion unit is connected with the input end of the boosting unit;

the high-voltage side of the voltage boosting part uses combined fuses, each phase of combined fuses comprises two or more than two fusing modules which are connected in parallel, and each fusing module comprises at least one high-voltage current-limiting fuse.

Furthermore, the high-voltage current-limiting fuse is a full-range high-voltage current-limiting fuse for limiting the current of the transformer.

Furthermore, each fusing module further comprises a current limiting backup fuse connected with the full-range protection fuse in series.

Furthermore, a distributed insulation optical fiber temperature sensor is arranged on the full-range high-voltage current-limiting fuse.

Furthermore, a hydrogen sensor is installed in a box body of an oil-immersed transformer of the boosting unit.

Furthermore, the boosting unit is of a combined transformer structure.

Further, the insulating medium in the boosting unit is environment-friendly natural ester insulating oil.

Furthermore, the base is sprayed with epoxy zinc-rich primer.

Compared with the prior art, the utility model discloses following profitable technological effect has at least:

the utility model discloses set up combination formula fuse between the transformer high-voltage lead wire side of the unit that steps up and high-pressure load switch, this combination formula fuse includes two or two above parallelly connected high-pressure current-limiting fuse modules, includes at least a transformer for the current limiting in the fuse module full range high-pressure current-limiting fuse, when the contravariant all-in-one operation that steps up, this transformer for the current limiting full range protection high-pressure current-limiting fuse can protect the overcurrent and the short-circuit current condition in transformer and the return circuit.

Furthermore, a distributed insulated optical fiber temperature sensor and a temperature measurement receiving device are additionally arranged, when the temperature exceeds the standard, an alarm signal is sent out and is uploaded to the background through an optical fiber signal, so that the alarm is given in real time, and the background operator can conveniently turn off the alarm in time;

furthermore, the boosting unit is of a combined transformer structure, wherein the insulating medium is environment-friendly natural ester insulating oil, and the medium is flame-retardant, difficult to explode, degradable, environment-friendly, safe and reliable.

Furthermore, a hydrogen sensor is additionally arranged in a box body of an oil-immersed transformer of the boosting unit, and if an electric heating fault occurs, early warning can be performed in advance, and the fault range can be prevented from being enlarged.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a combined fuse according to an embodiment of the present application;

FIG. 2a is a schematic diagram of a first fuse portion after a distributed insulation optical fiber temperature sensor is installed according to an embodiment of the present application;

fig. 2b is a schematic diagram of a second fuse portion after a distributed insulation optical fiber temperature sensor is installed in the second fuse portion according to an embodiment of the present application;

fig. 3a is a first schematic diagram of an inner portion of a tank of an oil-immersed transformer of a boosting unit after a distributed hydrogen sensor is installed in the tank according to an embodiment of the present application;

fig. 3b is a schematic diagram of an internal portion of a box of an oil-immersed transformer of a boosting unit after a distributed hydrogen sensor is installed in the embodiment of the present application;

FIG. 4 is a front view of an embodiment of the inverter/booster integrated machine of the present invention;

fig. 5 is a top view of an embodiment of the inverter/booster all-in-one machine of the present invention.

In the drawings: 10. fusing module, 20, temperature sensor module, 30, hydrogen sensor, 100, base, 200, contravariant unit, 300, the unit that steps up, 400, switch board, 500, copper bar.

Detailed Description

This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the present invention, unless otherwise explicitly defined, the terms "set," "mounted," "connected," and the like are to be understood in a broad sense, and may be directly connected or indirectly connected through an intermediate medium, for example; can be fixedly connected, can also be detachably connected and can also be integrally formed; may be a mechanical connection; either internal to the two elements or in an interactive relationship between the two elements. The technical skill in the art can reasonably determine the specific meaning of the above words in the present invention by combining the specific contents of the technical solution.

The embodiment provides a combined fuse to solve the problem that the capacity of the existing inversion and boosting integrated machine is limited by the specification of the rated current of the fuse. The contravariant all-in-one that steps up includes: the hydrogen sensor comprises a base 100, an inversion unit 200, a boosting unit 300, a copper bar 500 between the inversion unit and the boosting unit, a power distribution cabinet 400, a temperature sensor module 20 of a high-voltage side fuse and a hydrogen sensor 30. Referring to fig. 1, a combined fuse is disposed between a high voltage lead side of a transformer of a boosting unit and a high voltage load switch, and includes: the fuse module 10 comprises at least one transformer current-limiting full-range high-voltage current-limiting fuse F1. In practical applications, the transformer current limiting full-range protection high-voltage current limiting fuse F1 can protect the circuit to be protected from overcurrent and short-circuit current.

In this embodiment, because combined type fuse includes two parallelly connected fusing modules, can realize shunting, increase combined type fuse's rated current, and then be applied to combined type transformer with it after, can solve the problem that current combined type transformer's capacity is subject to fuse rated current specification for current fuse satisfies the lectotype requirement that capacity exceedes 3150kVA combined type transformer.

Optionally, in the above combined fuse, each of the fuse modules 10 further includes: a current limiting back-up fuse F1 connected in series with the full range protection fuse, as shown in fig. 1.

Referring to fig. 2a and 2b, in the embodiment of the present application, a combined fuse is installed in a combined transformer, a temperature sensor module 20 is installed on a fuse module 10 to perform multi-point temperature measurement on the fuse, in the temperature sensor module 20, a distributed insulation optical fiber temperature sensor is used for each phase to measure the temperature of contact points at two ends of the fuse and the temperature of the middle part of the fuse, respectively, and distributed temperature signals are measured and uploaded by the distributed insulation optical fiber temperature sensors.

This insulating optic fibre temperature sensor of distributing type can realize carrying out the multiple spot temperature measurement to the fuse, and pass through the temperature measurement receiving arrangement with the temperature signal upload to the backstage, judge whether the temperature exceeds standard by the backstage, send alarm signal when the temperature exceeds standard, the temperature measurement receiving arrangement passes through optic fibre and uploads the signal to backstage control system, report to the police in real time, make things convenient for backstage operating personnel to in time turn-off, realize the protection and the information ization management and control of equipment level, can let post personnel carry out the equipment operation at the remote end, supervisory equipment operation parameter, reach the purpose of practicing thrift manpower resources, reduce the fortune maintenance cost, and to a great extent reduces and causes the circuit influence because of the fuse trouble.

Referring to fig. 3a and 3b, in the embodiment of the present application, the voltage boosting unit 300 uses a combined transformer, the insulating medium in the box transformer uses environment-friendly natural ester insulating oil, a hydrogen sensor 30 integrated with an internal optical fiber is built in the box body, when the insulating oil cracks to generate hydrogen due to a fault in the box body, the hydrogen sensor 30 is triggered to upload a fault electrical signal to the background monitoring host and alarm, and the background determines whether the hydrogen in the oil exceeds a preset limit value.

When the hydrogen content in the oil does not exceed the limit value, the alarm is not given and the acquired data are uploaded to a background data center;

when the content of each gas in the oil exceeds the limit value, the working personnel carries out diagnosis and pretreatment according to the alarm information and uploads the acquired data to the background.

The hydrogen sensor is arranged at monitoring points of a winding (comprising a high-voltage winding, a low-voltage winding and a neutral point) and an iron core of the combined transformer.

Referring to fig. 4 and 5, the embodiment of the utility model provides an contravariant all-in-one that steps up, it includes base 100, contravariant unit 200, step up unit 300, switch board 400 and copper bar 500. Base 100 sets up in the all-in-one machine bottom, and inverter unit 200 locates on base 100, and booster unit 300 and inverter unit 200 interval arrangement, and inverter unit 200's output links to each other through copper bar 500 with booster unit 300's input, and switch board 400 locates on base 100, is located booster unit 300's one side, and is adjacent with the high-voltage board among the booster unit 300. The power distribution cabinet 400 is connected with the secondary signals of the inverter unit 200 and the booster unit 300.

The base 100 adopts the standard collection dress base, and it is anticorrosive to utilize to spout the rich zinc priming paint of epoxy, and whole ground copper bar is run through to inside setting, sets up dedicated ground point.

Through the structure, on one hand, each unit adopts a modular design, has strong universality and replaceability, and is beneficial to standardized production; on the other hand, replace traditional container with base 100 and regard as bearing the weight of the unit, and with inverter unit 200 and the unit 300 interval arrangement that steps up, can increase the radiating efficiency of each part self, avoid the influence each other of other parts when the heat dissipation to improve the radiating effect of equipment, ensured the safe operation of equipment.

The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.

Claims (8)

1. The high-capacity photovoltaic inversion and boosting integrated machine is characterized by comprising a base (100), an inversion unit (200) and a boosting unit (300), wherein the inversion unit (200) and the boosting unit (300) are arranged on the base (100), the boosting unit (300) and the inversion unit (200) are arranged at intervals and are connected through a copper bar (500), and the output end of the inversion unit (200) is connected with the input end of the boosting unit (300);

the high-voltage side of the boosting unit (300) uses combined fuses, each combined fuse comprises two or more than two fusing modules (10) which are connected in parallel, and each fusing module (10) comprises at least one high-voltage current-limiting fuse.

2. The high-capacity photovoltaic inverter-booster all-in-one machine as claimed in claim 1, wherein the high-voltage current-limiting fuse is a full-range high-voltage current-limiting fuse for current limiting of a transformer.

3. The high-capacity photovoltaic inversion and boosting all-in-one machine as claimed in claim 2, wherein each fusing module (10) further comprises a current-limiting backup fuse connected in series with the full-range high-voltage current-limiting fuse.

4. The high-capacity photovoltaic inversion and boosting all-in-one machine as claimed in claim 2, wherein a distributed insulation optical fiber temperature sensor is mounted on the full-range high-voltage current-limiting fuse.

5. A high-capacity photovoltaic inversion and boosting all-in-one machine as claimed in claim 1, wherein a hydrogen sensor (30) is mounted in a box body of an oil-immersed transformer of the boosting unit (300).

6. The high-capacity photovoltaic inversion and boosting all-in-one machine as claimed in claim 1, wherein the boosting unit (300) is of a combined transformer structure.

7. The high-capacity photovoltaic inverter-booster all-in-one machine as claimed in claim 5, wherein the insulating medium in the booster unit (300) is environment-friendly natural ester insulating oil.

8. The high-capacity photovoltaic inverter-booster all-in-one machine as claimed in claim 1, wherein the base (100) is coated with an epoxy zinc-rich primer.

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