Complete transformer substations of KTP with capacity of 1000 and 1250 kVA

General Data

1. Purpose, scope, characteristics

1.1.Completed transformer substations with a capacity of 1000 and 1250 kVA are designed for temporary power supply to residential, public and industrial consumers.

1.2. KTP are carried out according to GOST 1469580 and have the following technical requirements:

KTP is designed for operation in the open air, in conditions of temperate climate at limit values of ambient temperature from 45 to + 40 С. Climatic design and accommodation category - U1 (GOST 1515069)

installation above sea level - not more than 1000 m

The air environment shall not contain caustic vapors, dust and gases in concentrations that destroy metals and insulation

the degree of protection provided by the shell as per GOST 1425496 corresponds to IP44D

1.3.Basic parameters:

capacity of one power transformer - 1000 and 1250 kVA

rated voltage on HV side - 6, 10 kV

maximum operating voltage at HV side - 7.2, 12kV

rated voltage at LV side - 0.4kV

thermal resistance current during 1s on HV - 20kA side

electrodynamic resistance current on HV side - 51kA

insulation level as per GOST 1516.176 - normal insulation

2. Volume and planning solutions

Two-transformer FTP consists of two separate, separately transported sections. Each section is an all-metal welded body with a two-pitched roof, and doors for the installation and maintenance of equipment. Base of sections is reinforced by hot-rolled channel for receiving loads of transformers. After installation on the foundation, the sections are docked and fastened at bolted connections. KTP includes RU 6 (10) kV, RU 0.4kV, compartments of power transformers, as well as receiving crossarms and portals of air input of HV and LV power lines. Distributors and transformer compartments are separated from each other by metal partitions with holes arranged in them for passage of busbars and cables. Overall dimensions of FFCP:

skate height excluding fan and IOB - 2535mm

height considering fan excluding IOB - 2735mm

height taking into account IOB - 4760mm

base width - 2200mm

roof width - 2380mm

KTP is long depends on structure of the equipment of RU6 (10) kV

a) at the base - 10100mm, at the roof - 10280mm

b) at the base - 10500mm, at the roof - 10680mm

c) at the base - 11300mm, at the roof - 11480mm

KTP is made of galvanized steel sheet according to GOST1491880 with a thickness of 1.5 and 2.5 mm, the base of KTP channel No. 10. Outside the FTP housing is covered with Temaprime EE soil and painted with FD 50 TCL paint .

3.FTP composition

3.1.RU6 (10) kV consists of compartments separated by partitions, with equipment installed in them. As intended, compartments are divided into lead-in compartments, outgoing line compartments, section compartment and transformer line compartment.

3.1.1.Inputting compartment and HV outgoing line compartment are used for input, switching and protection of incoming and outgoing HV lines. The lines are switched using autogas or vacuum load switches. Depending on the equipment installed inside, the width of the compartment changes (see Table 1). For the "cable" input of the power line, a rectangular hole 100x400mm is arranged in the floor of the compartments. For the "air" input of the power line, an air input cabinet (IOB) is installed above the compartment. At cable input of HV power lines, zero sequence current transformers can be installed on the cable.

3.1.2.Section compartment serves for manual or automatic connection and disconnection of HV busbars of section 1 with busbars of section 2. Manual partitioning is carried out using a disconnector. Automatic reserve entry (ATS) is performed using a vacuum load switch, which is controlled on the basis of microprocessor protection or on the basis of electromechanical relays. Depending on the equipment installed inside, the width of the compartment changes (see Table 1).

3.1.3.The transformer line compartment is used to switch on and off the transformer using a vacuum load switch, as well as its protection based on electromechanical relays or microprocessor units. The connection between the fuel line compartment and the power transformer itself is made by the bus when using TMG111000kVA and the cable when using TMG111250kVA. When using a cable jumper, zero sequence current transformers can be installed in the transformer line compartment.

3.1.4.Additional compartments for installation of three-phase anti-resonance groups of voltage transformers and their fuses are located in the HV outgoing line compartments below the load switch. To do this, separate doors for each compartment and a horizontal partition between them are made.

Each compartment of RU6 (10) kV has external and internal doors. The external door prevents free access to the actuators of the load switches and disconnectors and to the equipment installed inside. A lock and warning plates are installed on the outer door .

Behind the front door at a distance of 250 mm there are drive panels and internal doors. Internal doors prevent service personnel from entering the compartment when main knives and ground knives of load switches and disconnectors are switched on by means of special interlocks. The internal doors are equipped with mesh windows to control the visible rupture of the load switch knives and disconnectors, as well as to inspect the equipment without penetrating the compartment. Internal doors are fitted with locks and plates. When electromechanical or microprocessor protection is located in the compartment, a heater is installed on the lower internal door. Other necessary equipment may also be installed on the internal doors.

The drive panels are the supporting structure for the actuators of the load switches and disconnectors. From the outside they can contain RZiA equipment, drive interlocks, cable channels, grounding bosses, informing plates. From the inside, the drive panels serve as a frame for current transformers, voltage transformers and vacuum switches.

Load switches and disconnectors are interconnected by non-insulated aluminium bus bar AD31T of 50x5mm section, which passes from one compartment to another at height 2020mm from floor level and is fixed on support insulators.

3.2.RU0.4kV consists of conditionally separated compartments (all compartments except for metering compartment, are not separated from each other by partitions), with equipment installed in them. According to purpose, compartments are divided into inlet compartments, compartments of outgoing lines, sectional compartment and electric power metering compartment. Each compartment has a separate door (the compartment of outgoing lines has a double-leaf gate). Locks and warning plates are installed on the doors.

3.2.1.LV input compartment is used for switching and protection of the line coming from the transformer. It is separated from transformer compartment by metal partition with hole at the top for passage of phase current-carrying buses and with hole at the bottom for passage of zero bus. To protect the transformer, circuit breakers of stationary or rolling out version are installed in the input compartment. A disconnector is installed with stationary switches to provide a visible rupture of the main current-carrying circuit. Also, current transformers are installed in the input compartment for the organization of electric power metering circuits and measurement circuits, measuring instruments (ammeters and voltmeter), surge protection devices (OPN or RVN) and elements of the auxiliary system.

3.2.2.Section of LV outgoing lines serves for installation of equipment intended for protection and switching of LV outgoing lines. The entry of power cables into the compartment can be "cable" or "air." For the "cable" input of the power line, a rectangular hole is organized in the floor of the compartment. For the "air" input of the power line above the compartment, gland seals are installed in the FTP roof for the cable outlet and crossbeam to perceive the load of VL traction. The following equipment can be used as feeders on outgoing lines:

a) circuit breakers

b) fuse switches-disconnectors

c) circuit breakers with fuses

In the compartment of LV outgoing lines, energy metering can be organized separately for each outgoing line. For this purpose, current transformers and electric energy meters can be additionally installed. It is also possible to install reactive power compensation equipment (missile ejector launcher).

3.2.3.Section compartment serves for manual or automatic connection and disconnection of HV busbars of section 1 with busbars of section 2. Manual partitioning is carried out using a disconnector. Automatic reserve entry (ATS) is performed using the circuit breaker of stationary or rolling-out version, which is controlled using the unit of programmable relays OMRON ZEN. To ensure visible rupture of the main current-carrying circuits, the stationary circuit breaker is separated from both sides by disconnectors.

In the sectional compartment, in addition to power equipment, there is equipment of auxiliary circuits.

3.2.4.The metering unit is separated by metal partitions from the inlet compartment and the compartment of outgoing LV lines. Counters with are installed inside

glued blocks and their heating.

3.3.The transformer compartments are designed to install TMG11 transformers with a capacity of 1000 and 1250kVA. To roll out and roll the transformer, in the compartment there are guides for the transformer wheels from hot-rolled channel No. 10. Compartment is separated from other compartments by metal partition with process holes for passage of current-carrying buses and cables. Exhaust fan TN500/150 is installed on the roof to perform forced ventilation of the transformer. To control the fan, the temperature controller TA3 is installed in the compartment. Transformer compartment is equipped with gates for installation, dismantling and maintenance of equipment. The gate has vents, locks, information and warning plates. At a height of 1400mm from the floor, a barrier with the label "High voltage .

Dangerous to life! " Under the transformer the oil receiver for 20% of oil of the full volume of oil of torr with branch in the oil pan is organized.

3.4. "Air" input frames (IOB) are used for entry of 6 (10) kV VL into FFCP. IOBs are metal box on top covered with roof, with pass-through insulators installed on it. At the base of the cabinet lies a frame for attachment of the portal to the installation flange on the FTP roof with a hole for the passage of current-carrying tires. IOB has a door for installation and inspection of tyres and insulators. Outside in the upper part of the cabinet there is a receiving crossbeam equipped with brackets, pins and loops for installation of protection devices (RVO, OPN) and pin insulators. The air inlet cabinets are divided into single and double (IOB1 and IOB2). ShVV1 is intended for input of one VN line and has one number of insulators. IOB2 is designed to introduce the incoming and outgoing HV line and has 2 rows of insulators and current-carrying buses.

4. Auxiliary circuits and lighting of KTP.

Auxiliary circuits (CSP) including internal lighting, heating, ventilation, electrical sockets, external lighting of CSP, protection and control devices are made in the FTC. TsSN is supplied from three phases of busbars 1 and 2 of RU0.4kV section, for uninterrupted power supply of the system. The inputs are controlled using the ALT system made on the PML electromagnetic starters.

Internal illumination of KTP is executed of 220B with installation on input of the differential automatic machine with a setting of shutdown of current of leak to 30ma (PUE6.1.16). Power supply from ALT unit comes to auxiliary panels of 1 and 2 sections located in LV input compartments, from where it is distributed to FFCP lighting devices. The control of lighting fixtures of transformer compartments and RU0.4kV, is carried out by the unipolar switch mounted in SSN. To control the lighting of RU6 (10) kV, a separate switch is installed on the drive panels of each of the compartments. Also, a single-pole electric socket is mounted in the ShSN.

Heating of electric power meters and RZiA devices is provided in KTP. Fans and temperature controllers are installed in transformer compartments to maintain preset temperature.

To illuminate the area in front of the FTC, an external lighting control unit is provided, which includes an input three-phase circuit breaker, a magnetic PML starter and a photosensitive machine with a photocell.

The power supply line of the operational circuits leaves the auxiliary circuit ALT unit through the circuit breaker. This line is not performed if the operating circuits are supplied from voltage transformers located in RU6 (10) kV.