CN210669116U

CN210669116U - Photovoltaic box-type substation

Info

Publication number: CN210669116U
Application number: CN201921534867.XU
Authority: CN
Inventors: 宋紫烟; 陈威; 李彬; 田嘉辉
Original assignee: Hubei Electric Power Equipment Co ltd
Current assignee: Hubei Electric Power Equipment Co ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2020-06-02
Anticipated expiration: 2029-09-16

Abstract

The utility model provides a photovoltaic box-type substation, which integrates a lightning arrester, a high-voltage load switch and a live display in a box body, and uses a high-voltage outlet cabinet to replace two traditional switch cabinets, thereby reducing the volume of the cabinet body; the high-voltage outlet cabinet adopts a fixed side-mounted vacuum circuit breaker and a grounding switch or an isolating switch, so that the whole space is reduced and the width of 650mm and the height of 2000mm can be achieved; by arranging the high-voltage metering cabinet, the voltage and the current on a power supply line can be metered, and a foundation is provided for charging of a power grid; through setting up the UPS power, uninterrupted power source promptly, adopt commercial power, UPS uninterrupted power source dual power supply mode, when the commercial power is undervoltage or fall the power, give each equipment power supply through UPS uninterrupted power source, do not influence the normal work of transformer substation.

Description

Photovoltaic box-type substation

Technical Field

The utility model relates to a photovoltaic power generation field especially relates to a photovoltaic box-type substation.

Background

In recent years, the photovoltaic power generation technology is vigorously developed in China, the demand of power transmission and transformation products matched with the photovoltaic power generation technology is increased day by day, and the combined transformer special for photovoltaic power generation is widely applied due to the advantages of short production period, simple and convenient structure, less investment and the like. The photovoltaic grid-connected power generation system in China mainly comprises a solar cell array, a junction box, an inverter, a step-up transformer, a low-voltage alternating-current power distribution cabinet, a direct-current power distribution cabinet and a high-voltage switch. The direct-current power distribution cabinet, the inverter, the boosting transformer and the high-voltage switch equipment belong to a power transformation grid-connected part. The existing photovoltaic transformer substation has the following problems:

(1) when the mains supply is under-voltage or power-down, each device in the transformer substation cannot be powered on and cannot work normally;

(2) the transformer substation is characterized in that two switch cabinets are arranged in a traditional high-voltage chamber, one switch cabinet is an incoming line cabinet, a lightning arrester and a live display are placed in the incoming line cabinet, the other switch cabinet is an outgoing line cabinet, a normally-installed high-voltage load switch, a fuse and a live display are placed in the outgoing line cabinet, and due to the fact that the two switch cabinets are arranged in the high-voltage chamber, the transformer substation is large in size, and the transformer substation is inconvenient to carry and install. Therefore, for solving the above problem, the utility model provides a photovoltaic box-type substation adopts compact side-mounted formula vacuum circuit breaker, reduces cabinet body volume.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a photovoltaic box-type substation adopts compact side-mounted formula vacuum circuit breaker, reduces cabinet body volume.

The technical scheme of the utility model is realized like this: the utility model provides a photovoltaic box-type substation, which comprises a high-voltage metering cabinet, a high-voltage outlet cabinet, a low-voltage inlet and outlet cabinet and a control cabinet;

the low-voltage wire inlet and outlet cabinet comprises a low-voltage wire outlet chamber and a low-voltage wire inlet chamber which are arranged up and down;

a vacuum circuit breaker is arranged in the high-voltage outlet cabinet;

a voltage transformer and a first current transformer are arranged in the high-voltage metering cabinet;

an outgoing branch circuit breaker and an outgoing main circuit breaker are arranged in the low-voltage outgoing line chamber; an incoming line branch breaker and a second current transformer are arranged in the incoming line chamber;

the control cabinet comprises an instrument room, a UPS room and a self-use transformer room; the instrument room is provided with a safety grid-connected device, the UPS room is provided with a UPS power supply, and a self-use transformer and a dry-type transformer are arranged in the self-use transformer room;

one end of the vacuum circuit breaker is electrically connected with a power line of the high-voltage metering cabinet, the other end of the vacuum circuit breaker is electrically connected with one ends of the voltage transformer and the first current transformer respectively, the other end of the first current transformer is electrically connected with one end of the outgoing line branch circuit breaker and one end of the outgoing line main circuit breaker respectively through the dry-type transformer, the other end of the outgoing line branch circuit breaker is electrically connected with the incoming line branch circuit breaker through the second current transformer, the other end of the outgoing line main circuit breaker is electrically connected with one end of the UPS power supply through the self-use transformer, and the other end of the UPS power supply is electrically connected with the power line of the high-voltage metering cabinet, the high-voltage outgoing.

On the basis of the technical scheme, preferably, a lightning arrester and a first live-wire display are further arranged in the high-voltage wire cabinet;

one end of the lightning arrester and one end of the first live display are respectively electrically connected with one end of the vacuum circuit breaker, and the other end of the lightning arrester and the other end of the first live display are grounded.

On the basis of the technical scheme, preferably, a high-voltage fuse and a second electrified display are further arranged in the high-voltage metering cabinet;

one end of the high-voltage fuse and one end of the second electrified display are respectively electrically connected with the other end of the vacuum circuit breaker, and the other end of the high-voltage fuse and the other end of the second electrified display are both grounded.

On the basis of the technical scheme, preferably, the low-voltage outlet chamber further comprises a surge protector;

one end of the surge protector is electrically connected with one end of the outgoing line main breaker, and the other end of the surge protector is grounded.

On the basis of the above technical scheme, preferably, the incoming branch circuit breaker includes a plurality of molded case circuit breakers;

the outgoing branch circuit breakers are electrically connected with one ends of the plurality of molded case circuit breakers through the second current transformers.

On the basis of the technical scheme, preferably, the instrument room further comprises a plurality of miniature circuit breakers;

the other end of the UPS is respectively and correspondingly electrically connected with the power lines of the high-voltage metering cabinet, the high-voltage outlet cabinet, the low-voltage inlet and outlet cabinet and the safety grid-connected device through a plurality of miniature circuit breakers.

On the basis of the technical scheme, preferably, the instrument room further comprises a multifunctional meter;

the multifunctional meter is electrically connected with the safety grid-connected device.

The utility model discloses a photovoltaic box-type substation has following beneficial effect for prior art:

(1) the lightning arrester, the high-voltage load switch and the electrified display are integrated in one box body, and one high-voltage outlet cabinet is used for replacing two traditional switch cabinets, so that the size of the cabinet body is reduced;

(2) the high-voltage outlet cabinet adopts a fixed side-mounted vacuum circuit breaker and a grounding switch or an isolating switch, so that the whole space is reduced and the width of 650mm and the height of 2000mm can be achieved;

(3) by arranging the high-voltage metering cabinet, the voltage and the current on a power supply line can be metered, and a foundation is provided for charging of a power grid;

(4) by arranging the UPS, namely the uninterruptible power supply, and adopting a double power supply mode of mains supply and the UPS, when the mains supply is under-voltage or power-down, each device is supplied with power through the UPS, and the normal work of a transformer substation is not influenced;

(5) by arranging the safety grid-connected device, internal faults of the distributed photovoltaic power station can be automatically isolated, various different types of power equipment in the station can be accessed in multiple communication modes, information such as remote signaling, remote measuring, electric power, electric energy quality and the like can be transmitted to a photovoltaic monitoring main station, dispatching and the like, and commands such as remote switching-on and switching-off, remote dispatching and the like of the main station are received;

(6) by arranging the multifunctional meter, the functions of a voltmeter, an ammeter, a power factor meter, a power meter, a frequency meter and a watt-hour meter can be integrated, the quantity values can be circularly displayed on a display interface, and the quantity values can be directly converted into 4-20mA signals or pulse signals to be transmitted to a photovoltaic monitoring main station.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a front view of a high voltage metering cabinet and a high voltage outlet cabinet in a photovoltaic box-type substation of the present invention;

fig. 2 is a front view of a low-voltage in-out line cabinet and a control cabinet in the photovoltaic box-type substation of the present invention;

fig. 3 is a front view of the high voltage outlet cabinet in the photovoltaic box-type substation;

fig. 4 is a right-view internal view of a high voltage outlet cabinet in a photovoltaic box-type substation;

fig. 5 is an electrical schematic diagram of a high voltage part in a photovoltaic box-type substation of the present invention;

fig. 6 is the utility model relates to an electric schematic diagram of low voltage part in photovoltaic box-type substation.

1-high voltage metering cabinet, 11-second electrified display, 2-high voltage outlet cabinet, 21-vacuum circuit breaker, 22-first electrified display, 3-low voltage inlet and outlet cabinet, 31-low voltage outlet chamber, 32-low voltage inlet chamber, 4-control cabinet, 41-instrument chamber, 41-1-safety grid-connected device, 41-2-multifunctional meter, 42-UPS chamber and 43-self-use transformer chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, the photovoltaic box-type substation of the present invention includes a high voltage metering cabinet 1, a high voltage outlet cabinet 2, a low voltage inlet and outlet cabinet 3 and a control cabinet 44;

and a high voltage outlet cabinet 2 for distributing electric energy from the bus bar. In the present embodiment, as shown in fig. 1, 3 and 4, a vacuum circuit breaker 21, a lightning arrester and a first live display 22 are provided inside the high-voltage distribution cabinet 2. When the vacuum circuit breaker 21 is at the closing position, the ground insulation of the vacuum circuit breaker 21 is borne by the supporting insulator, and once a permanent ground fault occurs to a line connected with the vacuum circuit breaker 21, after the vacuum circuit breaker 21 trips, a ground fault point is not cleared, and the ground insulation of an electric bus is borne by a vacuum gap of a fracture of the vacuum circuit breaker 21; when various faults are broken, the vacuum insulation gap between a pair of contacts of the fracture is resistant to various recovery voltages without breakdown. The surge arrester protects the electrical equipment from high transient overvoltages and limits the freewheel time, as well as often the freewheel amplitude. In this embodiment, the vacuum interrupter 21 is denoted by QS, and its model is VS 1-12; BL is used for representing the lightning arrester, and the model number of the lightning arrester is HY5 WZ-17/45; the second charged display 11, model number DSN-10Q, is denoted by GSN 2. The high voltage outlet cabinet 2 outputs 10KV voltage to the high voltage metering cabinet 1.

The high-voltage metering cabinet 1 is mainly used for metering electric energy through an electric meter. In the present embodiment, as shown in fig. 1, the voltage output by the high voltage metering cabinet 1 is 10 KV. A voltage transformer, a first current transformer, a high-voltage fuse and a second electrified display 11 are arranged in the high-voltage metering cabinet 1; wherein, the voltage transformer provides voltage signals for the watt-hour meter; the first current transformer provides a current signal for the watt-hour meter; the high-voltage fuse provides overcurrent protection for the voltage transformer. In the embodiment, a TV is used for representing a voltage transformer, and the model of the voltage transformer is JDZX 10-10; TAa-c are used for representing a first current transformer which comprises three windings and is of the type LZBJ 9-10; the vacuum interrupter 21 is designated FU, which is model XRNP-10; the second charged display 11, model number DSN-10Q, is denoted by GSN 1.

As shown in fig. 2, the low-voltage incoming and outgoing line cabinet 3 includes a low-voltage outgoing line chamber 31 and a low-voltage incoming line chamber 32 which are arranged up and down. The low-voltage wire inlet chamber 32 is used for introducing 10kV voltage output by the high-voltage wire outlet cabinet 2. In this embodiment, an incoming branch breaker and a second current transformer are disposed in the low-voltage incoming chamber 32; the incoming line branch circuit breaker comprises a plurality of molded case circuit breakers, in the embodiment, 5 molded case circuit breakers are used, the 5 molded case circuit breakers are respectively represented by QF 1-QF 5, and the models of the 5 molded case circuit breakers are NXM-250H; the second current transformer provides current signal for the watt-hour meter, whose model is BH-0.66.

And the low-voltage outlet chamber 31 is used for transmitting the 10kV voltage to the power transformer. As shown in fig. 1, in the present embodiment, an outgoing line branch breaker, an outgoing line main breaker and a surge protector are provided in the low-voltage outgoing line chamber 31; wherein QF is used for representing an outlet branch breaker, and the type number of the outlet branch breaker is NA 1-2000X-630M/3P; 1QK represents an outgoing line main breaker, and the model number of the outgoing line main breaker is NXM-63H; LR is used as surge protector, and the model is JLSP-GA 750/80.

As shown in fig. 2, the control cabinet 4 includes an instrument room 41, a UPS room 42, and a self-use transformer room 43;

as shown in fig. 2, the meter room 41 is provided with a safety grid 41-1, a multifunction meter 41-2 and a plurality of small-sized circuit breakers. In this embodiment, the safety grid-connected device 41-1 is a device having functions of distributed photovoltaic power generation protection, measurement and control, power quality detection, backflow prevention, operation control, communication management, teleoperation, and the like, and is capable of automatically isolating internal faults of the distributed photovoltaic power station, supporting multiple communication modes to access various different types of power devices in the station, transmitting information such as remote signaling, remote measurement, power level, power quality, and the like to a photovoltaic monitoring master station, a scheduling station, and receiving commands such as remote switching on and off, remote tuning, and the like of the master station. The multifunctional meter 41-2 integrates the functions of the previous voltmeter, ammeter, power factor meter, power meter, frequency meter and watt-hour meter, can circularly display the quantities on a display interface, and can directly convert the quantities into 4-20mA signals or pulse signals to be sent to a photovoltaic monitoring main station. In this embodiment, 10 small-sized circuit breakers are used.

The UPS room 42 is provided with a UPS power supply, i.e., an uninterruptible power supply, which is a system device that connects a storage battery to the safety grid-connected device 41-1 and converts a direct current into a city power through the safety grid-connected device 41-1, and is mainly used to provide stable and uninterrupted power supply for power electronic devices such as an electromagnetic valve, a pressure transmitter, and the like.

A self-use transformer and a dry-type transformer are arranged in the self-use transformer chamber 43; the model of the dry type transformer is SCB11-315kVA, the capacity is 315KVA, the high-voltage rated gear is 10.5KV, 5 gears are adjustable, one gear is 10.5KV, and each gear is gradually decreased by 0.25 KV; the dry-type transformer is used for boosting or reducing voltage of municipal power supply; after the transformer is used in a power supply of electrical equipment, if a primary side or a secondary side fails, the high-quality dry-type transformer can be effectively isolated, so that the failure phenomenon cannot affect the other side; the dry type transformer does not change power when voltage is adjusted after being used, so that the current can be changed along with the voltage change, and the effect of changing impedance can be achieved.

As shown in fig. 5 and fig. 6, one end of the vacuum circuit breaker 21 is electrically connected to the power line of the high voltage metering cabinet 1, one end of the lightning arrester and one end of the first live display 22, the other end of the lightning arrester and the other end of the first live display 22 are grounded, the other end of the vacuum circuit breaker 21 is electrically connected to one end of the high voltage fuse, one end of the second live display 11 and one end of the first current transformer, the other end of the high voltage fuse is grounded through the voltage transformer, the other end of the second live display 11 is grounded, the other end of the first current transformer is electrically connected to one end of the outgoing line branch circuit breaker, one end of the outgoing line main circuit breaker and one end of the surge protector through the dry transformer, the other end of the surge protector is grounded, the other end of the outgoing line branch circuit breaker is electrically connected to one end of the 5 molded case, the other end of 5 moulded case circuit breakers respectively with converge 5 input one-to-one electric connection of flow box, the one end electric connection of the other end of the main circuit breaker of being qualified for the next round of competitions through self-service transformer and UPS power, the other end of UPS power respectively through 3 small-size circuit breakers and high-voltage box, low-voltage box and the power cord one-to-one electric connection of being incorporated into the power networks the device, wherein, still 3 small-size circuit breakers are used for turning off the illumination respectively, three hole sockets and four hole socket circuit, 3 small-size circuit breakers are used for reserve.

The working principle of the embodiment is as follows: the high-voltage wire cabinet 2 distributes 10KV electric energy from the bus to the high-voltage metering cabinet 1, the vacuum circuit breaker 21 is used as a switch element in the high-voltage wire cabinet 2, when a line fails, the line is cut off rapidly, and the rear stage of the line is protected from being influenced; the high-voltage metering cabinet 1 introduces 10KV electric energy output by the high-voltage outgoing line cabinet 2 into the cabinet, and measures current and voltage in a line by using a first current transformer and a voltage transformer, after measurement, the 10KV electric energy is output to the low-voltage incoming line chamber 32, a dry type transformer in the low-voltage incoming line chamber 32 reduces the voltage of the 10KV voltage to 0.5KV, the low-voltage incoming line is designed into 4 paths and can be connected with 4 alternating current combiner boxes, and the low-voltage outgoing line chamber 31 converges 4 paths of input into 1 path of output to be connected to the low-voltage side of the self-used transformer for boosting. The voltage of 0.5KV is boosted by a transformer, one part of the boosted voltage is used for illumination, heating and supplying power to a socket, and the other part of the boosted voltage supplies power to a high-voltage outlet cabinet 2, a high-voltage metering cabinet 1, a low-voltage inlet-outlet cabinet 3 and a control cabinet 4.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a photovoltaic box-type substation which characterized in that: comprises a high-voltage metering cabinet (1), a high-voltage outlet cabinet (2), a low-voltage inlet and outlet cabinet (3) and a control cabinet (4);

the low-voltage wire inlet and outlet cabinet (3) comprises a low-voltage wire outlet chamber (31) and a low-voltage wire inlet chamber (32) which are arranged up and down;

a vacuum circuit breaker (21) is arranged in the high-voltage wire outlet cabinet (2);

a voltage transformer and a first current transformer are arranged in the high-voltage metering cabinet (1);

an outgoing line branch circuit breaker and an outgoing line main circuit breaker are arranged in the low-voltage outgoing line chamber (31); an incoming line branch breaker and a second current transformer are arranged in the incoming line chamber;

the control cabinet (4) comprises an instrument room (41), a UPS room (42) and a self-service transformer room (43); the instrument room (41) is provided with a safety grid-connected device (41-1), the UPS room (42) is provided with a UPS power supply, and a self-use transformer and a dry-type transformer are arranged in a self-use transformer room (43);

one end of the vacuum circuit breaker (21) is electrically connected with a power line of the high-voltage metering cabinet (1), the other end of the vacuum circuit breaker (21) is electrically connected with one ends of a voltage transformer and a first current transformer respectively, the other end of the first current transformer is electrically connected with one end of a wire outlet branch circuit breaker and one end of a wire outlet main circuit breaker through a dry transformer respectively, the other end of the wire outlet branch circuit breaker is electrically connected with the wire inlet branch circuit breaker through a second current transformer, the other end of the wire outlet main circuit breaker is electrically connected with one end of a UPS power supply through a self-use transformer, and the other end of the UPS power supply is electrically connected with the power lines of the high-voltage metering cabinet (1), the high-voltage wire outlet cabinet (2), the low-voltage wire inlet and outlet.

2. A photovoltaic box substation according to claim 1, characterized in that: a lightning arrester and a first live-wire display (22) are also arranged in the high-voltage wire outlet cabinet (2);

one end of the lightning arrester and one end of the first live display (22) are respectively electrically connected with one end of the vacuum circuit breaker (21), and the other end of the lightning arrester and the other end of the first live display (22) are grounded.

3. A photovoltaic box substation according to claim 1, characterized in that: a high-voltage fuse and a second electrified display (11) are also arranged in the high-voltage metering cabinet (1);

the one end of high-voltage fuse and the one end of electrified display (11) of second respectively with vacuum circuit breaker (21) other end electric connection, the other end of high-voltage fuse and the other end of the electrified display of second (11) all ground connection.

4. A photovoltaic box substation according to claim 1, characterized in that: the low-voltage outlet chamber (31) also comprises a surge protector;

5. A photovoltaic box substation according to claim 1, characterized in that: the incoming branch circuit breaker comprises a plurality of molded case circuit breakers;

the outgoing branch circuit breakers are electrically connected with one ends of the plurality of molded case circuit breakers through second current transformers.

6. A photovoltaic box substation according to claim 1, characterized in that: the instrument room (41) also comprises a plurality of miniature circuit breakers;

the other end of the UPS is electrically connected with power lines of the high-voltage metering cabinet (1), the high-voltage outlet cabinet (2), the low-voltage inlet and outlet cabinet (3) and the safety grid-connected device (41-1) in a one-to-one correspondence mode through the small circuit breakers.

7. A photovoltaic box substation according to claim 1, characterized in that: the instrument room (41) further comprises a multifunctional meter (41-2);

the multifunctional meter (41-2) is electrically connected with the safety grid connection device (41-1).