CN204424772U - Two main transformer four segmentation integrated automation converting stations - Google Patents

Abstract

The utility model provides a four-section comprehensive automatic substation with two main transformers. The substation includes: two 35 kV incoming lines; The low-voltage terminal outputs 10 kV power supply; the segmented four-section 10 kV busbar is respectively connected to the low-voltage terminal of the two main transformers; the capacitor is connected to the 10 kV busbar; the station transformer is connected to the 10KV busbar kilovolt bus. The utility model replaces the seriously aging equipment in the substation, meets the modern control and operation requirements of the modern power grid, improves the safety and stability of the power grid, improves the reliability of equipment operation, and improves the intelligent level of the power grid; the system structure is simple and can be implemented in the existing substation , without the need for new land acquisition, saving costs.

Description

Two main transformer four-section comprehensive automation substation

technical field

The utility model relates to an automatic substation system, in particular to a four-section comprehensive automatic substation with two main transformers.

Background technique

For the existing old-fashioned substations in operation, the 35kV is connected by a line transformer group with a circuit breaker, and the 10kV is connected by a single-bus four-section connection.

The normal operation mode of this station is that three 35kV incoming lines supply No. 1, No. 2 and No. 3 main transformers respectively; No. 1 main transformer supplies 8 outgoing lines of 10kV Section 1; No. 2 main transformer supplies 4 outgoing lines of 10kV Section 2 and Section 3 respectively; No. 3 main transformer provides 8 outlets for 10kV four sections. A 10kV first/second section sectional switch and section leads are installed between the 10kV first section and second section busbars; a 10kV third/fourth section section switch and section lead wires are installed between the 10kV third section and fourth section busbars; No. 2 main transformer The 10kV leads are supplied to the 10kV two-section and three-section busbars through the 10kV two-section switch and the 10kV three-section switch respectively. The No. 1 main transformer and No. 1 capacitor of this station are not put into operation at present. The 10kV section 1 busbar was put into operation in April 2003, and the 10kV 1st/2nd section switch was put into operation at the same time.

There are two 20MVA main transformers in the station, 35/10kV voltage level, the main transformers are connected with DYN11, and the neutral point is grounded through the grounding resistor. Three sets of 3000kvar capacitor banks installed in the station adopt BAM-11/√3-100-1W type capacitors.

The 35kV switchgear is open type, and the 35kV circuit breaker adopts SW2--35Ⅳ type oil-less circuit breaker, and is equipped with CT2-XGⅡ spring operating mechanism.

The 10kV busbar switchgear for the first section is Changzhou Lanling KYN1B-10, and the 10kV switch adopts ABB Co., Ltd. model VD4. The 10kV second, third, and fourth busbar switchgear is Fuzhou Tianyu KYN4A-10, and the 10kV switch adopts Fuzhou Tianyu Electric Co., Ltd. ZN21- 12.

Due to historical reasons, the existing old power station protection devices include domestic electromagnetic relays and microcomputer relays produced by ABB. Among them, the main transformer differential relay adopts BCH-1 electromagnetic relay; the first/second segment self-cutting adopts ABB's REF543 relay, and the third/fourth segment self-cutting adopts ZJ-II electromagnetic relay; 10kV outgoing line, 10kV Capacitors and 10kV station transformers are protected by DGL series relays and ABB's SPAA 341C2 microcomputer relays.

The telecontrol equipment uses the DF1331 remote terminal equipment (Remote Terminal Unit, RTU) of Dongfang Electronics. There is no dispatching data network equipment in the station.

The equipment mentioned above is seriously aging, with poor operating conditions and high failure rates, and there are problems in terms of operational reliability and safety.

Utility model content

The utility model provides a four-section comprehensive automatic substation with two main transformers, which can improve the stability of the power grid operation and ensure the normal life consumption of residents.

In order to achieve the above purpose, the utility model provides a four-section integrated automatic substation with two main transformers, which is characterized in that the substation includes:

Two 35 kV incoming lines;

Two main transformers, the high-voltage end of which is respectively connected to two 35 kV incoming lines, and outputs a 10 kV power supply through the step-down low-voltage end;

Segmented four-section 10 kV busbars, which are respectively circuit-connected to the low-voltage terminals of the two main transformers;

Capacitors, the circuit of which is connected to the 10 kV bus;

Station transformer, whose circuit is connected to the 10 kV busbar.

The two above-mentioned 35 kV incoming lines are respectively connected with a main transformer, and the two main transformers are connected with a segmented four-section 10 kV bus, and the four-section 10 kV bus is respectively connected with a capacitor or a station transformer.

The above-mentioned 35 kV incoming line is provided with a 35 kV switch.

The above-mentioned 35 kV switch adopts SF6 circuit breaker and is equipped with a spring operating mechanism.

The above-mentioned 10 kV bus is connected with a voltage transformer.

A 10 kV switch is provided on the wiring connecting the above 10 kV bus to the power supply or load.

The above-mentioned 10 kV switch adopts a vacuum circuit breaker.

The above-mentioned 10 kV busbar is connected to a power supply or a load with a current transformer.

The neutral point of the above-mentioned main transformer is grounded, and the neutral point grounding form adopts a small resistance grounding.

A set of voltage transformers and lightning arresters are installed on each section of the above 10 kV busbar.

Compared with the existing technology, the utility model has two main transformer four-section integrated automatic substations. Its advantage is that the utility model replaces the seriously aging equipment in the substation, meets the modern control and operation requirements of the modern power grid, and improves the safety and stability of the power grid. Improve the reliability of equipment operation and improve the intelligence level of the power grid;

The system of the utility model has a simple structure and can be implemented in an existing substation without requiring new land acquisition, thereby saving costs.

Description of drawings

Fig. 1 is a system circuit diagram of the utility model with two main transformers and four subsections integrated automatic substation.

Detailed ways

Below in conjunction with accompanying drawing, further illustrate the specific embodiment of the present utility model.

As shown in Figure 1, it is a system schematic diagram of a four-section integrated automatic substation with two main transformers disclosed by the utility model. The substation includes two 35 kV incoming lines 1, each 35 kV incoming line 1 A 35 kilovolt switch 3 is connected below. Each 35 kV incoming line 1 is connected to a main transformer through its 35 kV switch 3 circuit respectively. The two 35 kV switches are respectively installed in the two 35 kV incoming lines 1 to generate heat. Both are located in the 10 kV switch room of the substation building. The 35 kV switches use SF6 circuit breakers and are equipped with spring operating mechanisms for communication or disconnect the incoming line.

The main transformer adopts a 35kV/10kV transformer of the model SZ7-20000, and the two main transformers under the two 35kV incoming lines 1 are respectively located in two separate main transformer rooms of the substation. The high-voltage end circuit of each main transformer is connected to the 35 kV switch 3 on the 35 kV incoming line 1 where it is located, and the respective 35 kV incoming line voltage is converted to 10 kV for output from the low-voltage end, the neutral point of the main transformer is grounded, and the grounding form Ground for a small resistor.

In this embodiment, the main transformers under one of the two 35 kV incoming lines 1 are the first main transformer 21 and the second main transformer 22 respectively. The low-voltage end circuit of the first main transformer 21 is connected with a segmented three-terminal 10 kV bus bar and supplies power to it. The three-terminal 10 kV bus bar is respectively the first 10 kV bus bar 51, the second 10 kV bus bar 52 and the second 10 kV bus bar 52. Three 10 kV buses 53 . The low-voltage end circuit of the second main transformer 22 under the other 35 kV incoming line 1 is connected to a section of the fourth 10 kV bus 54 and supplies power to it.

Two capacitors 7 are connected on the first 10 kV bus 51 of the lower section of the first main transformer 21, and a capacitor 7 or a station are connected respectively on the second 10 kV bus 52 and the third 10 kV bus 53 transformer6. Only a fourth 10 kV bus 54 is connected to the second main transformer 22, and a capacitor 7 and a station transformer 6 are connected to the fourth 10 kV bus 54 at the same time.

It can be known from the above embodiments that the low-voltage end of each main transformer can be connected with a plurality of 10 kV bus bars segmented or only connected with a section of 10 kV bus bar. A capacitor 7 and a station transformer 6 are simultaneously connected under each main transformer, and a capacitor 7 and/or a station transformer 6 may be circuit-connected on any 10 kV bus.

The type of capacitor 7 is LQZBJ-10. Each group of capacitors 7 in the substation system is installed in each capacitor room, and connected to the corresponding 10 kV bus through cables. In this implementation, two 35 kV incoming lines are respectively provided with a group of capacitors, and each group of capacitors adopts double star connection Y-Y to play the role of reactive power compensation.

The model of station transformer 6 is SCL-63KVA, which are respectively connected to the 10 kV busbar through cables. The body of station transformer 6 is installed in the station transformer room of the substation to provide power for the entire substation.

A set of voltage transformers and lightning arresters are also installed on each section of 10 kV bus. The group of voltage transformers and arresters are respectively located in each voltage transformer/arrestor cabinet in the 10kV switch room. The voltage transformers provide indications for the voltmeter in the station, and the lightning arresters play the role of lightning protection.

There is also a voltage transformer 8 connected to the circuit on each 10 kV bus, and its model is JDZJ-10.

Preferably, a 10 kV switch 4 is provided on the connecting cable between the 10 kV busbar connected to the power supply terminal (main transformer) and its load (station transformer 6, capacitor 7, voltage transformer and lightning arrester). Volt switch 4 adopts 10 kV complete switchgear, all 10 kV switches are located in 10 kV switch room, all adopt vacuum circuit breakers, and each switch can connect or disconnect the corresponding outgoing line. 10 kV switch 4 models optional ZN-10.

In specific use, the station has a total of 16 outgoing line switches, 2 10 kV switches for capacitors, 2 section switches, and 2 10 kV switches for station transformers.

Preferably, a current transformer of model LCJ-10 is also installed on the connecting cable between the 10 kV busbar connected to the power supply terminal (main transformer) and its load (station transformer 6, capacitor 7, voltage transformer and lightning arrester) 9.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions of the present utility model will be obvious to those skilled in the art after reading the above content. Therefore, the protection scope of the present utility model should be defined by the appended claims.

Claims (10)

1. A four-section integrated automatic substation with two main transformers, characterized in that the substation includes: Two 35kV incoming lines (1); Two main transformers, the high-voltage terminals of which are respectively connected to two 35 kV incoming lines (1), and output a 10 kV power supply through the step-down low-voltage terminal; segmented four-section 10 kV busbars, respectively circuit-connected to the low-voltage terminals of the two main transformers; a capacitor (7) circuit connected to said 10 kV bus; The station uses a transformer (6), whose circuit is connected to the 10 kV bus. 2. The four-section comprehensive automatic substation with two main transformers as claimed in claim 1, characterized in that, the two 35 kV incoming lines (1) are respectively connected with a main transformer, and the two main transformers are connected with The segmented four-section 10-kilovolt busbars are respectively circuit-connected with capacitors (7) or station transformers (6). 3. The integrated automatic substation with two main transformers and four sections according to claim 1, characterized in that, the 35 kV incoming line (1) is provided with a 35 kV switch (3). 4. The integrated automatic substation with two main transformers and four sections according to claim 3, characterized in that, the 35 kV switch (3) adopts SF6 circuit breaker and is equipped with a spring operating mechanism. 5. The integrated automatic substation with two main transformers and four subsections according to claim 1, characterized in that a voltage transformer (8) is connected to the 10 kV bus. 6. The two-main-transformer four-section integrated automatic substation according to any one of claims 1 to 5, wherein a 10 kV switch is provided on the wiring of the 10 kV bus connecting the power supply or the load (4). 7. The integrated automatic substation with two main transformers and four subsections according to claim 5, characterized in that the 10 kV switch (4) adopts a vacuum circuit breaker. 8. The two-main-transformer four-section integrated automatic substation according to any one of claims 1 to 5, wherein a current transformer ( 9). 9. The two-main-transformer four-section integrated automated substation according to claim 1, wherein the neutral point of the main transformer is grounded, and the neutral point grounding is grounded with a small resistance. 10. The four-section integrated automatic substation with two main transformers as claimed in claim 1 is characterized in that a group of voltage transformers and lightning arresters are installed on each section of the 10 kV bus.