CN204760838U - It holds low intelligent combination formula transformer substation of decreasing to have to carry to transfer - Google Patents

Abstract

The utility model discloses an on-load capacity regulating low-loss intelligent combined substation, which comprises a high-voltage room, a transformer room and a low-voltage room. Outlet cabinet, the transformer room is placed with a load-adjusting three-dimensional coil core transformer, and the low-voltage room is placed with a low-voltage incoming cabinet, a low-voltage compensation cabinet and a low-voltage outgoing cabinet. The primary equipment adopts a fully enclosed structure, and the secondary equipment adopts a substation Microcomputer integrated automatic control system, the equipment in the high-voltage room, transformer room and low-voltage room can be combined freely according to needs. The utility model integrates a high-voltage switchgear, an on-load capacity-adjusting three-dimensional coil core transformer, and a low-voltage switchgear.

Description

On-load capacity adjustment and low loss intelligent combined substation

technical field

The utility model relates to the field of complete sets of power distribution equipment, in particular to an on-load capacity regulating low-loss intelligent combined substation.

Background technique

Over the past two decades of economic development, the pattern of urban power supply has undergone major changes. The past method of centralized voltage reduction and long-distance power distribution has greatly restricted urban power supply and reduced the economic benefits of power supply companies. The reason is that the power supply radius is too large, the line loss increases greatly with the increase of power load, and the quality of power supply is also greatly reduced. For this reason, the country requires high voltage to directly enter the urban area and go deep into the load center in the construction of the urban network. At the same time, due to the development of informatization, networking and intelligent residential quarters, not only the box-type substation is required to be safe and reliable, but also the intelligent functions of "four remotes" (telemetry, remote signaling, remote adjustment, and remote control) are required.

Contents of the invention

In order to solve the above existing technical problems, the utility model provides an on-load capacity-adjusting low-loss intelligent combined substation, which integrates a high-voltage switchgear, an on-load capacity-adjusting three-dimensional coil core transformer, and a low-voltage switchgear. Small, complete set, suitable for large-scale application in urban and rural power grid construction and transformation.

In order to achieve the above object, the technical solution adopted in the utility model is:

On-load capacity adjustment and low-loss intelligent combined substation includes a high-voltage room, a transformer room and a low-voltage room. The high-voltage room is equipped with high-voltage incoming cabinets, high-voltage metering cabinets, high-voltage ring network cabinets and high-voltage outgoing cabinets. The transformer room A three-dimensional wound core transformer with load capacity adjustment is placed. The low-voltage room is equipped with a low-voltage incoming cabinet, a low-voltage compensation cabinet and a low-voltage outgoing cabinet. The primary equipment adopts a fully enclosed structure, and the secondary equipment adopts a substation microcomputer integrated automation control system. The above-mentioned high-voltage room, transformer room and low-voltage room equipment can be combined freely according to needs.

The low-voltage contact in the low-voltage chamber adopts a differential arc structure, and the low-voltage contact switches between the micro-arc or no-arc state, which solves the problem that the volume of insulating oil inside the transformer capacity adjustment switch is small, and the need for long-term arc suppression needs to be met. Short-lived conundrum.

The utility model has a simple structure. On the basis of the traditional box-type substation, the primary equipment in the box adopts advanced equipment such as a fully enclosed high-voltage switchgear, a three-dimensional coil core transformer with load capacity adjustment, and the product has no exposed live parts, and is fully enclosed and fully insulated. The structure can completely achieve zero electric shock accidents, the whole station can realize oil-free operation, and has high safety performance. The secondary equipment adopts a microcomputer integrated automatic control system, which can realize unattended, safe and reliable; Compact, each box constitutes an independent system, the combination is flexible and changeable, and meets the safe operation needs of users; the three-dimensional three-dimensional wound core transformer with load capacity adjustment makes the width of the transformer room significantly narrower, occupies a small area, and has a beautiful appearance , can be used as a fixed substation or as a mobile substation, which has the function of embellishing and beautifying the environment.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the internal schematic diagram of the high pressure chamber of the utility model;

Fig. 3 is a schematic diagram of the interior of the low-pressure chamber of the utility model.

Detailed ways

The utility model is described in detail below in conjunction with accompanying drawing and specific embodiment:

As shown in Figure 1-3, the on-load capacity regulation low-loss intelligent combined substation includes a high-voltage room 1, a transformer room 2 and a low-voltage room 3, and the high-voltage room 1 is equipped with a high-voltage incoming cabinet 11 and a high-voltage metering cabinet. 12. High-voltage ring network cabinet 13 and high-voltage outlet cabinet 14. The transformer room 2 is placed with a load-adjusting three-dimensional coil core transformer 21, and the low-voltage room 3 is placed with a low-voltage incoming cabinet 31, a low-voltage compensation cabinet 32 and In the low-voltage outlet cabinet 33, the primary equipment adopts a fully enclosed structure, and the secondary equipment adopts a substation microcomputer integrated automatic control system. The equipment in the high-voltage room 1, transformer room 1 and low-voltage room 3 can be freely combined according to needs.

In the specific implementation process, after the utility model is installed and debugged, the specific parameters are as follows:

1. System rated voltage: 10kV, maximum voltage: 12V;

2. The rated voltage of the high-voltage side of the transformer: 10.5 ± 5% V for urban transformers or close to the power supply side, and 10 ± 5% V for remote power supply sides or rural transformers; rated voltage on the low-voltage side: 0.4V.

3. Rated frequency: 50Hz

4. Rated thermal stability current and time (A/s): high voltage circuit 20kA/3 low voltage circuit 30kA/1; ground circuit 20kA/3.

5. Rated dynamic and stable current and time (peak value, A): 50 for high-voltage circuit; 63 for low-voltage circuit; 36 for grounding circuit;

6. Power frequency withstand voltage (V): high-voltage circuit 42; high-voltage fracture 48; low-voltage circuit 2.5; transformer 35; control and auxiliary circuit: 2.0.

7. Lightning impulse withstand voltage (V): 75 for high-voltage circuit; 85 for high-voltage fracture; 6 for low-voltage circuit.

8. Noise level: the transformer capacity is not more than 50dB within 1250kVA.

9. The protection level of the box shell: not lower than IP3X; the color of the box is army green.

10. Allowable temperature rise: see GB/T11022-1999 for the allowable temperature rise of high-voltage equipment; see GB1094 or GB6450 for the allowable temperature rise of transformers; see GB7251 for the allowable temperature rise of low-voltage equipment;

11. Transformers of 1000kVA and below are protected by high-voltage load switch-fuse, and transformers of 1250kVA and above are protected by high-voltage circuit breakers.

12. Maximum allowable size (depth × width × height: mm): 630kVA and below transformer terminal type 3200×2000×2500, ring network type 3200×2500×2500; 1250-8000kVA transformer terminal type 3400×2300×2600, ring network type Type 3400×2700×2600.

The function that the utility model can realize and the characteristics that have are as follows:

1. Integration of on-load capacity regulation and pressure regulation;

2. Using synchronous differential arc drawing technology, low-voltage contact micro-arc or no-arc switching design greatly improves the service life of low-voltage high-current contacts, slows down the aging speed of insulating oil, and realizes the miniaturization of switches.

3. Intelligent load tracking and automatic operating system design

The device can also be provided with an electromagnetic clutch that makes the pressure regulating part and the capacity regulating part share a set of operating mechanisms between the lower end of the operating mechanism of the capacity regulating part and the fast mechanism of the capacity regulating part and the fast pressure regulating mechanism. An electrical control box can also be provided to automatically adjust the capacity according to the change of the transformer load current or automatically adjust the voltage according to the fluctuation of the load voltage. Using the method of double-channel mutual inspection, using intelligent load to track the load change of the substation equipment, and automatically issuing operation instructions can realize the automatic operation without monitoring.

4. High voltage wiring method inside the box transformer

On the high-voltage (12kV) side, the load switch current fuse (or vacuum circuit breaker) is used as the main protection of the transformer. Generally, there are three power supply modes: ring network, dual power supply and terminal, and there are two sets of plug-in fuses and backup protection fuses. Concatenation for segment range protection. When one phase of the current-limiting fuse is blown, it must be able to trip the three-phase load switch in linkage, and no phase loss operation will occur. The load switch on the line side must be equipped with a DC power supply (DC24V) electric operating mechanism, which can realize self-starting without external AC power supply. The ring network circuit must be equipped with current transformers or sensors for fault current detection. The ring network power supply unit generally consists of at least three compartments, namely, two loop cable inlet and outlet compartments and one transformer loop compartment. When the load switch isolates the faulty line segment, it can restore the continuous power supply of the circuit in time; the fuse F connected with the load switch plays a protective role in the case of an internal fault in the medium-voltage/low-voltage transformer; the load switch also isolates and protects the fuse and the transformer. grounding effect. High-voltage switches should be selected from advanced products with high reliability and automation devices and communication interfaces: such as SF6 load switch, compressed air load switch, vacuum load switch, etc.

5. Transformer matching and heat dissipation treatment

Transformers for box-type transformers generally reduce the voltage to 380V/220V, and the capacity of the transformer is 160-1600kva, and the most commonly used capacity is 315-630kVA. Its body is a three-phase three-column or three-phase five-column structure, DYnll or YYn0 connection, and the fuse is connected outside the "△". The advantage of the three-phase five-column DYnl1 transformer is that it has a strong three-phase asymmetrical load capacity, no neutral point voltage offset due to three-phase load asymmetry, the quality of the load voltage can be guaranteed, and it has good lightning protection characteristics. The transformer should have complete operation inspection instruments and meters, such as oil level gauge, upper oil temperature gauge and vacuum pressure gauge reflecting the top air pressure.

6. The transformer adopts a three-dimensional coil core transformer, which has obvious energy-saving effect.

7. Equipped with intelligent system

The intelligent components used in the intelligent box transformer should be equipped with power supply, interface devices, communication media, and control equipment (host computer, intelligent instrument, etc.) to meet the requirements of intelligence. The smart box becomes: use Profuse-DP standard and open fieldbus technology to connect components with communication capabilities (slave station), so as to realize the remote measurement, adjustment and control of the switch and power grid by the master station through the bus , communication; or use an intelligent controller to perform local or remote measurement, adjustment, control, and communication on the high and low voltage sides. Considering the user's requirements for intelligent monitoring when configuring the system scheme, one of the following two methods is adopted: 1) Intelligent systems are separately configured on the high and low voltage sides; 2) Intelligent systems are uniformly configured on the high and low voltage sides. The installation, layout, and on-site wiring of components of the intelligent system should meet the relevant requirements. For electromagnetic compatibility (EMC), advanced anti-interference technology must be adopted. The monitoring software written mainly includes remote control interfaces such as main circuit, frame circuit breaker, control circuit and power distribution system information.

Of course, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above-mentioned examples, and changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the present utility model are also acceptable. Should belong to the protection scope of the present utility model.

Claims (2)

1. On-load capacity adjustment and low loss intelligent combined substation, characterized in that it includes a high-voltage room (1), a transformer room (2) and a low-voltage room (3), and the high-voltage room (1) is placed with a high-voltage incoming line cabinet (11), high-voltage metering cabinet (12), high-voltage ring network cabinet (13) and high-voltage outlet cabinet (14). In the low-voltage room (3), there are low-voltage incoming cabinets (31), low-voltage compensation cabinets (32) and low-voltage outgoing cabinets (33). The primary equipment adopts a fully enclosed structure, and the secondary equipment adopts a substation microcomputer integrated automation control system. The equipment in the above-mentioned high-voltage room (1), transformer room (2) and low-voltage room (3) can be combined freely according to needs. 2. The on-load capacity regulating low-loss intelligent combined substation according to claim 1, characterized in that the low-voltage contacts in the low-voltage chamber (3) adopt a differential arc structure, and the low-voltage contacts are in the micro-arc or No arc state switching.