Reconstruction and maintenance of 330 kV Liski PS. Correction of design documentation - Power supply system

Contents

Explanatory Note

1. Introduction

1.1. Basis for Design

1.2. Design Input

2. Main technological solutions for reconstruction

2.1. Existing Utility Scheme

2.2. Auxiliary Design Diagram

(Drawing No. 178-23-t.1-01)

2.3. Main Equipment Selection

2.3.1. Calculation of short-circuit currents in 10kV network

2.3.2. Selection of 10kV equipment

2.3.3. Calculation of short-circuit currents in AC network

2.3.4. Selection of MV transformers

(Drawing No. 178-23-t.1-02)

2.3.5. Selection of 0.4kV circuit breakers

2.4. Power supply of auxiliary loads

2.4.1. Lighting

2.4.2. Outlet network

2.4.3. Power network

Applications

1. Introduction

1.2. Design Input

The initial design data are:

• normal operating diagram of PS 330kV "Liski" for 2007;

• feasibility study (FS) on reconstruction and modernization of PS of 330 kV Liski;

• working documentation on reconstruction and technical re-equipment of PS 330kV Liski, performed in 2000-2005;

• Minutes of the technical meeting on the consideration of the first stages of the design of the facilities of OJSC "FGC UES" - the Center's MEAs of 20.12.2007 (No. 54 dated 20.02.2008)

• Minutes of the technical meeting on the preliminary selection of the land plot for the reconstruction stages of PS 330kV Liski dated 20.02.2008.

The site of the substation PS "Liski" 330/220/110 kV is located in the Liskinsky district of the Voronezh region, to the north-west of Liski.

The substation is remote from the existing urban development at a distance of 1.4km, and from the promising development for individual housing construction by 0.5 km. The site is located in the forest zone, in the pine forest.

The substation accommodates :

- OPC 330, 220, 110 kV;

- Two AT 330/220/10kB of ATDTsTG240000/330 type with voltodobavochny VRTDNU-240000/35 transformers

- Two AT 220/110/10kB of ATDTsTN-200000/220/110-U1 type

- 10kV KRUN cabinets

- 10kV RP building with 10kV reactor chambers

- UP1 building, OPU-2

- Compressor station buildings

- Open oil warehouse with oil equipment room

- 250 m3 fire tank with pump station and art wells

- Three-section fan cooling tower

- Auxiliary building

- Auxiliary structures.

Switchgears of operating PS 330kV "Liski" are made according to the following diagrams:

• ORU 330kV is made as per diagram of VL + 2 AT unit with AT connection through switches. To the SHOUTING of 330 kV VL of 330 kV "Liski - Valuyki" strictly are connected to tires via the disconnector via switches 2 ATDTsTG240000/330 and also.

• RPU 220kV is made according to the scheme "one working partitioned system of prefabricated buses with bypass." 5 VL 220kV are connected to the 220kV switchgear: VL Liski - Pridonskaya (1.2 circuits), Liski - Bobrov, Liski - NVAES (2 circuits), as well as 2 AT 330/220 with a capacity of 240MVA and 2 AT 220/110kV with a capacity of 200M;

• RPU 110kV is made according to the scheme "two working partitioned from the bypass system of prefabricated buses." 9 110kV VL and 2 AT 220/110kV with capacity of 200MVA are connected to 110kV switchgear.

2 Basic technical solutions for reconstruction

2.1 Existing Utility Scheme

On the operating substation of 330 kV Liski for power supply of consumers of own needs is established two working TCH1 and TCH2 10/, 04 transformers of kV, 630 kVA and the reserve TCH4 transformer of 10/0.4 kV, 630 kVA, two RU of 0.4 kV and complete transformer substation of KTP2h630 of kVA of 10/0.4 kV.

The transformer of own needs of TCH1 is connected on the party of 10 kV to KRUN of 10 kV powered from a winding of low voltage (10 kV) of the AT-1-240 auto-transformer of ATDTsTG240000/330/220/10 type.

The transformer of own needs of TCH2 is connected on the party of 10 kV to KRUN of 10 kV powered from a winding of low voltage (10 kV) of the AT-1-200 auto-transformer of ATDTsTN200000/220/110/10U1 type.

The standby auxiliary transformer TSN4 is connected on the 10 kV side to the 10 kV SSRN powered by 10 kV KVL from feeder No. 4 "APN."

Now KTP works with one TM1 transformer of 10/0.4 kV, 630 kVA, powered from KRUN of 10 kV connected to a winding of low voltage (10 kV) of the AT-1-200 autotransformer of ATDTsTN200000/220/110/10U1 type. Standby power supply of 0.4 kV switchgear of FPCS is performed from 0.4 kV switchgear Compressor No. 2.

RU of 0.4 kV of own needs are established in buildings of OPU1 and OPU2.

2-section 0.4 kV MV board is installed in UP1 building, working sections of which are supplied from TSN1 and TSN2, redundancy is performed from TSN connected to the 1st section of 0.4 kV buses.

A 0.4 kV single-section MV board with a working input from the first section of 0.4 kV MV board to the UP1 and a standby input from the second section of 0.4 kV MV board to the UP1 is installed in the UP2 building.

Reconstruction of the scheme of own needs was partially executed on a title "The feasibility study (feasibility study) on reconstruction and modernization of PS 330 KV Liski (Voronezh region)", RAO UES of Russia approved by the Order of 17.02.2000 No. 77.

2.2. Auxiliary Design Diagram

At present, substation auxiliary power is supplied from LV winding (10 kV) of autotransformer 330/220 kV and LV winding (10 kV) of autotransformer 220/110 kV. Due to the low network congestion of 330 kV, one of the autotransformers 330/220 kV is in operation. When the autotransformer 330/220 kV is disconnected, the substation auxiliary power supply is provided from only one autotransformer 220/110 kV.

To increase reliability of auxiliary power supply of the substation, they are supplied from LV windings (10 kV) of two autotransformers 220/110 kV AT3, 4.

To implement the auxiliary consumption scheme, the following are constructed and installed on the PS:

• Two 10 kV RP working sections in the existing 10 kV RP building;

• 3rd a section board of own needs of 0.4 kV in the building of OPU2;

• 0.4 kV switchgear in the newly constructed 220 and 110 kV relay panel building;

• The second transformer installed in the existing KTP-2 10 630 kVA is connected to the RP kV;

• Three 10/0.4 kV MV transformers with a capacity of 630 kVA are installed.

To limit short-circuit currents, 10 kV current-limiting reactors are installed on 10 kV auxiliary RP buses to 10 kA.

After reconstruction, the substation's own needs will be supplied from the 3-section 10 kV RAM, with two working sections and one reserve section. Working sections are connected to low voltage windings (10 kV) of autotransformers 220/110/10 kV AT-3 and AT-4. The standby section is powered by a third-party power supply - feeder No. 4 "APN."

Auxiliary consumers of the substation are supplied from the 0.4 kV AC network.

The 0.4kV switchgear is made according to the explicit reserve scheme with separate operation of auxiliary transformers with double-acting ATS on the low side. In normal mode, each auxiliary transformer feeds the receivers of its section. In case of power loss, one of the working sections is energized from the standby section by switching on the section switch.

The 0.4 kV input-and-distribution device is made 2-section, with 2-side ALT, with separate power supply of each section in normal mode from the working sections of the auxiliary panel in the UP2 building.

0.4 kV switchgears and 10kV auxiliary switchgears are made of factory-made cabinets.

2.3.2 Selection of 10 kV equipment

In accordance with the calculation of short-circuit currents on 10 kV buses to limit short-circuit currents on 10 kV buses to the level of 10 kA, 10 kV current limiting reactors with a nominal current of 1600 A and a resistance of 0.35 Ohm are installed.

The following switches are installed in 10kV switchgear cabinets:

• Introductory - 10 kV, 1600 A, 25 kA;

• Sectional - 10 kV, 1600 A, 25 kA;

• Feeder - 10 kV, 630 A, 25 kA.

2.4 Auxiliary consumers power supply

The main consumers of auxiliary needs at the reconstructed substation are the designed electric receivers of the substation structures, classified by the power supply degree as IIII reliability category.

AC auxiliary receivers are operating circuits, electric motors of transformer cooling systems, high-voltage equipment drives, lighting, electric heating and room ventilation, electric heating of high-voltage switching equipment and cabinets installed in the open air, communication, alarm, etc.

To supply auxiliary electric receivers of the substation, a 3-section auxiliary panel of 0.4 kV cabinet type, prefabricated package, installed in the UP2 building and a 0.4 kV input-and-distribution device in the newly constructed 220 and 110 kV relay panel building are provided.

Power supply of auxiliary electric receivers is provided from 3-phase electrical network with grounded neutral voltage of 380/220V 10% with frequency of 50Hz + 2%. Executed on the TNS system.

Power cables with copper cores with insulation that does not spread combustion with low smoke and gas release (ngLS) are adopted at the IR for power supply to the distribution network of consumers. Insulation from polyvinyl chloride com-position of reduced combustibility .

2.4.3. Power network

At the substation there is a power network of buildings and structures and a power network of open distribution switchgears, which is performed by ka-beli with copper veins with insulation of low gas and smoke emission (ngLS) non-spreading combustion with insulation of low combustibility composition from PVC.

The power network of open switchgears provides for power supply of motors of high-voltage equipment drives, transformer cooling systems, heating of high-voltage switching equipment and cabinets.

Power network cables are laid in cable channels, trays and ducts.

Power, control and mutually redundant cables are routed along different routes.

Power distribution cabinets are installed in RMS near cable routes to reduce cable lengths and cross section.

The power network of buildings provides power supply to electric motors of ventilation and air conditioning systems, electric heating, as well as power supply to communication equipment, video surveillance, VAZP for DC board, VK, RP, APCS, AIIS PUE devices.

Cables in buildings are laid in electrical boxes on walls and ceilings, in rooms of RCh, SFCh, SFL, AWS in double floor. When passing cables through walls and floors, fire-resistant blocks from different elements of fire barriers are used.

Cable sections are selected by maximum load current, voltage drop and disconnection of single-phase short-circuit current at the end of circuit by circuit breaker.

178-23-т1-01.dwg

178-23-т1-02.dwg