KTP-250 kVA working design with 6 kV CS

Introduction.

The basis for the development and design of the complete transformer substation and cable line 6 kV from VL 6 kV SLIP to the designed KTP was the technical assignment of the customer based on the technical specifications for power supply design No. 0607E dated 08.06.07. This project shows the installation drawings of a 6/0.4 kV package transformer substation with a capacity of 250 kVA kiosk type, CL sections, cabling diagram, VL supports with RLND10/400.

For installation of FTC equipment, a pile base and a pile cap made of channel 20 are used.

Installation of cable line requires installation of A-shaped support with disconnector and installation works of LPR grounding loop directly at the support.

Purpose, operating conditions.

FTC is used for reception of electric energy of three-phase alternating current of frequency 50 Hz, voltage 6 kV, conversion to electric power of voltage 0.4 kV.

KTP 6/0.4 kV is designed for power supply to consumers of the garage cooperative at the address: Chukotsky JSC, Anadyr, Ote St.

Performance category as per GOST 1515069 - UHL1.

Height above sea level - no more than 1000 m.

Ambient air temperature: from 450С to + 400С;

The environment is non-explosive, not containing current-conducting dust, aggressive gases and vapors in concentrations that reduce FTC parameters within unacceptable limits.

External insulation as per GOST 992075 - category A.

Area in the wind and ice: VII.

Relative ambient air humidity is not more than 80% at 200C.

KTP are not designed for operation in conditions of shaking and vibration.

Electrical connection diagram.

On the 6 kV side, the power transformer is connected to the 10 kV line in a dead end circuit through a disconnector and fuses.

The transformer is connected to the 0.4 kV collecting buses through a chopper.

RP 0.4 kV KTP provides the possibility of connecting from 4 to 6 lines through fuses of NCP type with setpoints of 250A.

Power at 0.4 kV input is accounted for by three-phase four-wire meter connected through current transformers T0,66250/5.

For the operation of the meter in winter, a heating device is provided to ensure the normal operation of the meter at outside air temperature up to 450С.

Design.

Complete transformer substation of kiosk type 6/0.4 kV is made in the form of detachable structure, component parts of which are made with bolted connections.

FTC housing consists of roof, skin, base and is divided into compartments of high voltage device (HVV), transformer, low voltage switchgear (LVV), and service area.

The base is an all-welded structure, the upper part has

solid floor with louvres for natural cooling of transformer, designed for installation of power transformer 250 kVA and has 5 holes for introduction of low voltage cables 0.4 kV.

The UVN compartment has a steel door to protect the equipment.

LV LV compartment forms cabinet in which LV equipment is installed

and closes with a steel door.

Entry of 6 kV is performed by cable.

Low-voltage switching devices, assembly buses and metering unit are located in LV-LV compartment. Outputs of outgoing lines are made with insulated wire.

The FTC is connected to the overhead line through a 6 kV disconnector. which is installed separately on 6 kV "SLIP" VL support.

Grounding.

The grounding device is made common for FTC and 6 kV disconnector (on the support).

The resistance of the grounding device is accepted in accordance with PUE ch. 1.7:

- not more than 4 Ω for version of FTP with cable outgoing lines.

At the same time, it is taken into account that the specific resistance of the soil is more than 300 Ω/m.

Neutrals and the transformer housing, parts that can be energized in case of insulation damage, are subject to grounding.

Overvoltage protection is provided by 6 kV overvoltage limiters. set at 6 kV input.

КЛ 6 кВ.dwg

Ростверк, схемы, заземление.dwg