20, 35 kV closed switchgear
Switchgear are designed for:
- receiving and distributing of 3-phase AC power (50 Hz) at power facilities, oil and gas industry and other objects with resonant earthed or isolated neutral;
- placement of switching devices, busbars and connecting buses, auxiliary devices, as well as protection devices, automation, supervisory control, communications and measuring devices.
The switchgear is manufactured in a general purpose industrial version and is used as switchgear for indoor and outdoor installation in accordance with the requirements of technical conditions БКЖИ.670221.004TU.
Detailed information
Operating conditions
Switchgear comply with the requirements of the Electrical Installation Code, GOST 14693-90, technical conditions approved in accordance with the established procedure, customer design documentation, a package of engineering drawings, and diagrams of main and auxiliary circuits.
Switchgear designed for export must comply with the order form for foreign trade organization.
Nominal values of environmental climatic factors are as per GOST 15150-69 and GOST 15543.1, and:
-
altitude above sea level should not exceed 1000 m;
- explosion- and fire-proof environment, free from conductive or abrasive dust, conductive or chemically active gases, vapors and sediments that destroy insulation and metals (atmosphere of type I according to GOST 15150-69);
- ambient air temperature for outdoor heat-insulated switchgear - from -60 °С to +40 °С;
- relative humidity is up to 80%.
Outdoor switchgear shell structure:
a) corresponds to SNiP 2.01.07 and withstands:
-
air pressure of at least 0.5 kPa;
- weight of snow cover per 1 m² of horizontal roof surface is not less than 3.3 kPa at a safety factor of 1.0;
- uniform load over the floor is at least 2.0 kPa.
b)provides protection of interior spaces from precipitation (intensity of up to 5 mm/min);
c) ensures operation of equipment in icy conditions at an ice thickness up to 20 mm and wind speed up to 34 m/s, and in the absence of ice - at wind speed up to 40 m/s.
Maximum seismic resistance of switchgear is six points according to SNiP II-7-81. At the customer's request, the company can manufacture switchgear with seismic resistance of up to nine points. In this case, the equipment used for the certain configuration of the switchgear must comply with the seismic resistance requirements specified in the design documentation.
Switchgear do not resist shaking and vibration, and cannot be used in mobile, mine and other stations.
Main parameters and characteristics
| Parameter name | Parameter value |
| On the HV side | |
| Maximum capacity, kVA: | |
| of indoor transformers of outdoor transformers | 2500 16000 |
| Number of power transformers | 1, 2 |
| Rated voltage (line voltage), kV | 20, 35 |
| Highest operating voltage (line voltage), kV | 24, 40,5 |
| Test voltage of electrical equipment of switchgear in dry condition for one minute in accordance with the requirements of GOST 1516.3, kV | |
| - on the ground | 50/65 1) , 80/95 1) |
| - of power transformers relative to ground | 50/55 1) , 80/85 1) |
| - between the contacts of the fuse disconnectors | 60/75 1) , 95/120 1) |
| Test voltage of insulation of auxiliary circuits during 1 min in accordance with GOST 1516.3, kV | 2 |
| Rated current of main circuits of switchgear cabinets, A | 630, 1000, 1600, 2000, 2500 |
| Rated current of busbars, A | 1000, 1600, 2000, 2500, 3150 |
| Rated tripping current of the switchboard built-in circuit breaker, kA | 12,5; 16; 20; 25; 31,5, 40 |
| Thermal resistance current (during 3 s), kA | 20, 25, 31,5, 40 |
| Rated current of electrodynamic resistance of main circuits of switchgear cabinets (amplitude), kA | 51, 64, 81, 102 |
| On the medium voltage (MV) side of (CTS-35 (20)/6(10) kV | |
| Rated voltage, kV | 6; 10 |
| Highest operating voltage, kV | 7,2; 12 |
| Rated current of busbars, A | 630; 1000; 1600; 2000; 2500; 3150; 4000 |
| Electrodynamic resistance current of the busbar, kA | 51; 64; 81; 102; 128 |
| Thermal resistance current, kA | 20; 25; 31,5; 40; 50 |
| Thermal resistance current flow time, s | 3 |
| Rated voltage, V | |
| of auxiliary DC circuits of AC auxiliary circuits | 110; 220 220 |
| On the LV side of CTS-35/0.4 kV | |
| Rated voltage, kV | 0,4 |
| Rated current, A | 400; 630; 1000; 1600; 2000; 2500; 4000; 5000 |
| Electrodynamic resistance current of the busbar, kA | 21; 38; 51; 81; 100 |
| Thermal resistance current, kA | 10; 18; 22; 40; 50 |
| Thermal resistance current flow time, s | 1 |
| 1) The numerator shows values for level “a” insulation, the denominator shows values for level “b” insulation. | |
Classification of switchgear designs
| Name of classification indicator | Execution |
| Insulation level according to GOST 1516.3-96 | a, b |
| Type of insulation | Air, |
| Наличие изоляции токоведущих шин главных цепей | With insulated busbars; |
| Система сборных шин | With top-mounted busbars |
| Presence of pull-out elements in cabinets | With pull-out elements; |
| Type of linear high-voltage connections | Cable; |
| Maintenance conditions for high-voltage cells | Two-way service; |
| Protection degree of shells according to GOST 14254-96 | Not lower than IP20 - for indoor switchgears, |
| Type of auxiliary equipment and apparatus | Cabinets with operating current sources and rectifying devices, |
| By mutual arrangement of high-voltage equipment | Single-row; |
| According to the method of outgoing line outputs execution (busbars and cables) | Lead up; |
| Type of main enclosures depending on installed equipment and connections | With high-voltage vacuum circuit breakers; with non-linear surge arresters; |
| By type of shells (block module for outdoor switchgear substations) | In insulated sheathing; |
| Type of control | Local; |
| By number of modular units | Single-module; |
| According to the arrangement of cell busbars | Upper, |
Requirements to reliability
Switchgear meets the requirements for reliability and durability in accordance with GOST 20.39.312-85.
Outdoor switchgear ensure continuous operation of engineering equipment while unattended.
The established service life of the switchgear is not less than 25 years, subject to maintenance or replacement of equipment, in accordance with the instructions of the operation manual for certain types and their components (when replacing components whose service life is less than 25 years).
Reliability indicators of the main equipment (mean time between failures, probability of failure-free operation, etc.) - in accordance with the requirements of the technical conditions for the installed equipment.
Maintenance of the installed equipment and its repair are carried out using the spare parts kit supplied together with the equipment.
Product components
The switchgear a set of separate cabinets including switching devices and other high-voltage components, measuring instruments, automation and protection devices, as well as control and signaling equipment and other auxiliary devices. The cabinets are connected to each other in accordance with the electrical diagram according to the data sheet.
The configuration of switchgear equipment is determined by the customer and project design and usually includes:
- a set of high-voltage equipment;
- AC or DC power supply and distribution switchboards for power supply of auxiliary operative circuits.
Outdoor switchgear additionally include:
- pre-fabricated modular building;
- HVAC and lightning;
- security and fire alarm.
The technical characteristics of the equipment and components installed in the switchgear meet the requirements of the relevant standards and technical conditions of the manufacturers.
Single-line electrical diagrams of the main switchgear circuits must correspond to the project design, and in case of production according to non-standard diagrams - to the customer's diagrams.
A set of high voltage equipment consists of:
- switchgear - switchgear cabinets;
- busbar or cable bridges for connecting cubicles in double-row switchgear designs;
- other auxiliary equipment at customer's request.
The number of modular units of outdoor switchgears depends on the amount of equipment built into it.
The type of the installed equipment and its configuration are determined by the customer and project design.
The type of the used communications and supervisory control devices (if any) is determined by the customer and project design.
Auxiliary equipment for outdoor switchgear
The equipment for maintaining microclimate generally includes the following components:
- auxiliary box;
- heaters (convectors with mechanical thermostat or radiant heaters). The room temperature is regulated by thermostats operating in the range of -10…+50 °C;
- air temperature sensor (fan thermostat);
- electric fans;
- air conditioning system with control device (the type of air conditioner is determined by the customer and project design).
At the customer's request, it is possible to install other types of equipment for microclimate maintenance.
Internal workspace lighting is provided by fluorescent lamps, unless otherwise specified in the project specification.
Outdoor lighting is provided by incandescent lamps.
Working lightning voltage is ~220 V.
According to the requirements of SNiP 23-05-95, emergency and backup lighting of evacuation exits from a switchgear module is equipped with emergency luminaires LBA, installed at the entrance doors of switchgear, which indicate to a person a way to a safe place and ensure continuous operation for three hours in case of power failure.
Emergency lighting inside the switchgear, if there is an operating current cabinet SHOTV, is carried out by luminaires with incandescent lamps.
There is a step-down transformer ~220/12 V in the auxiliary box for maintenance lighting.
Security and fire alarm equipment (perimeter alarm system) generally includes:
- balanced magnetic switches (magnetic contact security alarm or contact switches);
- intruder detectors (space violation detectors);
- optoelectronic fire detectors (smoke fire detectors).
Upon the customer request, it is possible to install other types of security and fire alarm equipment, including in a separate box.
Implementator
SHIELD Engineering and manufacturing complex
The manufacturing division performs a complete cycle from welding metal structures for modular enclosures to turn-key ready equipping. The workshops are equipped with state-of-the-art multifunctional manufacturing equipment: automated laser cutting machines,…
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