Complete transformer power substation
Designation
Complete transformer substation КТСП-35 is designed to:
- 35 kV line supply of industrial and civilian objects;
- transformation of the voltage from 35 kV to 6/3, 3/1, 2/0, 69/0,4 kV;
- input of two independent lines 35 kV with reservation;
- distribution of secondary voltage, automatic transfer switch (АВР) on the secondary voltage;
- protection of outgoing lines;
- implementation of dispatching, full two-way communication with the control devices of cabinets РУВН and РУНН.
General information
The presented solution can solve the problem of congestion lines 6 kV and 10 kV of industrial networks and supply power to consumers 0,4 kV — 6 kV directly from the 35 kV line.
Advantages of the solution:
- transportability;
- full compliance with all applicable rules and regulations;
- absence of necessity for expensive capital construction;
- site preparation within a short time.
Receiving gantry of 35 kV
Receiving gantry is designed to:
- supply of one line 35 kV to the transformer substation КТСП-35;
- lightning protection КТСП;
- location of the switching equipment.
Here are placed:
- lightning protection masts;
- post insulators of the fastening of incoming lines;
- disconnectors and grounding conductors of each line;
- mechanical and electrical drives of disconnectors and grounding conductors;
- dischargers 35 kV.
The portal has a low weight and a special hardware that makes it easily transportable in the case of transporting.
TRANSFORMER SUBSTATION КТСП-35. COMPOSITION. ARRANGEMENT
The substation КТСП-35 has an outside design, the housing with protection degree IP54. The connection of incoming and outgoing cables is carried out from backside in the special input and output compartments, closed by removable covers. The connection of roll-out elements is available from the front side. All relay elements, microcontroller units, controls of РУ-35 and РУНН are moved out in the end part of a special section, provided with the heating system.
РУ-35. Input compartment:
- 35 kV busbar;
- quick-disconnect cable connections;
- auxiliary transformer;
- current transformers;
- ОПН-35.
РУ-35. 35 kV breaker compartment:
- 35 kV breaker on the roll-out element;
- alarm panel.
Diesel generator room:
- starter diesel generator.
Output compartment РУНН:
- terminal block for cable connection;
- busbar РУНН;
- current transformers;
- voltage transformers;
- power circuit components.
Switch compartment РУНН:
- power switching units (contactors, automatic circuit breaker, load-break switch);
- alarm panel;
- handles of disconnector (if available).
Automatic control and relay protection compartment:
- microcontroller units;
- elements of control circuits and alarm system;
- meters for the energy accounting (if available).
There is a room for starter dieselgenerator provided in the bottom part from backside of РУНН. The starting of diesel generator is carried out before the switching of disconnector 35kV on the portal structure. Using it, the power is supplied to the microcontroller units, which check the substation and electrical drives of disconnector and grounding conductors.
The arrangement of substation and dimensions depend on the required parameters and functions: the power of transformer, the number of inputs 35 kV and the need of АВР, voltage class and РУНН configuration.
So if it is necessary to provide the manual or automatic reservation of 35 kV power line, there is the installation of the second input 35 kV with a separate vacuum circuit breaker and an off- line control and supply circuit. The single-line diagrams of the variants of РУВН and РУНН configuration are listed below.
TRANSFORMER SUBSTATION КТСП-35. HIGH-VOLTAGE SWITCHGEAR (РУВН)
The variant of РУВН КТСП-35 kV with one input
The high-voltage switchgear (РУВН) is designed to:
- input of power circuit 35 kV;
- switching lines by the vacuum circuit breaker;
- execution of substation relay protection;
- implementation of control and measurement functions;
- substation protection from the lightning overvoltage;
- implementation of control and dispatching functions.
The composition of the high-voltage switchgear (РУВН) is the following:
- 35kV vacuum circuit breaker on the roll-out element;
- current transformers;
- auxiliary transformer;
- units ОПН-35;
- bus voltage indicators;
- elements of electromechanical interlocks.
The variant of РУВН КТСП-35 kV with two inputs
The high-voltage switchgear (РУВН) is designed to:
- input of the power circuit 35 kV of two independent lines 35 kV;
- switching lines by the vacuum circuit breakers;
- automatic (АВР) and manual reservation of power;
- execution of substation relay protection;
- implementation of control and measurement functions;
- substation protection from the lightning overvoltage;
- implementation of control and dispatching functions.
The composition of the high-voltage switchgear (РУВН) is similar to the previous.
Transformer substation КТСП-35. Low-voltage switchgear (РУНН) (1,2/0,69/0,4 kV)
РУНН (1,2/0,69/0,4 kV) КТСП-35 kV with single-section diagram
Low-voltage switchgear (РУНН) is designed to:
- switching of outgoing lines;
- execution of the relay protection of consumers;
- implementation of control and measurement functions;
- implementation of control and dispatching functions;
- energy accounting (on request).
The design of РУНН (1,2/0,69/0,4 kV) is a modular board.
The composition of РУНН (varies depending on the design) is the following:
- no load disconnectors (plug-in contacts);
- circuit breakers (load-break switch, contactors, starters);
- current transformers;
- bus voltage indicators;
- elements of electromechanical interlocks.
РУНН (1,2/0,69/0,4 kV) КТСП-35 kV with two-section diagram
Low-voltage switchgear (РУНН) is designed to:
- switching of outgoing lines;
- reservation of power (АВР);
- execution of the relay protection of consumers;
- implementation of control and measurement functions;
- implementation of control and dispatching functions;
- energy accounting (on request).
The composition of the low-voltage switchgear (РУНН) is similar to the previous.
TRANSFORMER SUBSTATION КТСП-35. AUTOMATIC CONTROL AND RELAY PROTECTION COMPARTMENT
All elements of the control circuits, relay protection, automation, dispatching and the diesel generator control circuits are placed in the control compartment, which is located at the end face of КТСП-35 on the side of low-voltage switchgear (РУНН). There is also located meters for the energy accounting. The compartment has a built-in heating system, insulated walls and hinged gates for access to the substation control board.
Transformer substation КТСП-35. Low-voltage switchgear (РУНН) (6/3,3 kV)
РУНН (6 kV; 3,3kV) includes:
- vacuum circuit breakers on the roll-out element;
- current transformers;
- grounding conductors of outgoing lines and busbar;
- microcontroller units МКЗП-3;
- units ОПН;
- auxiliary transformers.
Power transformers
Power transformers are produced by RESIN GLASS FIBER (RGF) technology, which is based on the electrical insulating system together with filler – a reinforcing material based on electro-technical glass (composite material).
High-voltage insulation consists of the composite material with a linear expansion coefficient approximately equal to the linear expansion coefficient of copper. This allows to use a transformer in extreme conditions, such as the switching of transformer on a rated load at low environment temperatures. This allows to place it in a room without heating system. The reliable insulation makes conductive circuits of transformer impervious to condensate water. Transformers manufactured by the RGF technology admit «cold starts» that is good for Siberian climate. Due to the high electric strength of composite material, these transformers withstand switching and atmospheric overvoltage. This allows to use a high-speed vacuum equipment, and as a result reduces the destructive consequences of short circuits in the network. Transformers manufactured by the RGF technology admit «cold starts» that is good for Siberian climate. Due to the high electric strength of composite material, these transformers withstand switching and atmospheric overvoltage. This allows to use a high-speed vacuum equipment, and as a result reduces the destructive consequences of short circuits in the network.
Due to the high mechanical strength (the mechanical strength of composite is comparable to the mechanical strength of steel St3) transformers are resistant to the dynamic forces caused by shot circuits. Magnetic conductor of the transformer is produced of cold-rolled anisotropic steel with low specific losses that leads to reduce the average costs of a company throughout the operational lifetime of products.
Low voltage windings are made of copper ribbon and the turn insulation of winding is a prepreg based on the calendered Nomex paper of DuPont, which is a world leader in the chemical industry. The winding turns conglutinate and form a one-piece system after the curing process. This material permits a long working temperature up to 220 ° C that provides a high heat reserve of device and so the increased emergency overloads. Due to the usage of it the heat transfer of device improves and there are no hot spots that lead to reliability improvement. Transformers are completed with the winding temperature detectors.