11KV Pad mounted transformer specifications

Writer： Hengfeng you electric Time：2023-04-07 views：times

1、 Overview of Pad mounted transformer
1.1 the technical specification of the equipment is applicable to 10kV / 11kv Pad mounted transformer. The technical specification puts forward the technical requirements for the functional design, structure, performance, and test of the product.
1.2 technical standards (HENGFENGYOU ELECTRIC 10 / 11kv Pad mounted transformer shall comply with the current Chinese national standards and industrial standards. 13.8kv/34.5kv series Pad mounted transformer shall comply with ANSI C57, DOE, CSA, IEEE, IEC60067 and other standards. See also the technical specifications of 13.8kv Pad mounted transformer)
 
GB1094. 1 power transformers - Part 1: General
GB1094. 2 power transformers - Part 2: temperature rise
GB1094. 3 power transformers - Part 3: insulation level, insulation test and external insulation air gap
GB1094. 4 power transformers - Part 4: guidelines for lightning impulse and operational impulse tests of power transformers and reactors
GB1094. 5 power transformers - Part 5: capacity to withstand short circuit
GB/T1094. 10 power transformers - Part 10: Determination of sound level
Gb2536 transformer oil
Gb5273 terminals for transformers, high voltage apparatus and bushings
GB7251 low voltage switchgear
GB / t17467 high voltage / low voltage prefabricated distribution station
GB / t17468 guide for selection of power transformers
GB / t6451 technical parameters and requirements for oil immersed power transformers
GB2900. Electrotechnical terminology: transformer, transformer, voltage regulator and reactor
JB / t8637 non excitation tap changer
GB/T14048. 1 General rules for low voltage switchgear and controlgear
GB38043. 6kV ~ 40.5kV high voltage AC load switch
GB / t11022 common technical requirements for high voltage switchgear and control equipment standards
Gb4208 enclosure protection class (IP code)
Technical specification for 10kV American box type substation, technical specification for 11kv American box type substation
 
2、Conditions
2.1 ambient air temperature
Maximum temperature: + 40 ℃
Minimum temperature: - 15 ℃
Maximum daily average temperature: + 30 ℃
Maximum annual average temperature: + 20 ℃
Maximum daily temperature difference: 25K
2.2 altitude: no more than 1000m;
2.3 wind speed: no more than 25m / S;
2.4 ambient humidity
The monthly average value shall not be greater than 90%
Daily average value shall not be greater than 95%
2.5 earthquake resistance
Earthquake intensity: magnitude 8
2.6 inclination of installation site: no more than 3 °
2.7 consider the influence of sunlight, pollution, condensation and natural corrosion.
2.8 the surrounding air shall not be obviously polluted by corrosive or combustible gases and water vapor, and there shall be no violent vibration at the installation site of box transformer.
 
3、 Technical parameter requirements of Pad mount transformer
3.1 main technical parameters
3.1.1 product model: zgs11-z-Pad mounted transformer
3.1.2 rated voltage: high voltage 10kV / 11kv, low voltage 0.4kV
3.1.3 rated power: 50Hz
3.1.4 number of phases: three phases
3.1.5 connection group: Dyn11
3.1.6 high and low voltage incoming and outgoing line mode: one in and four out
3.1.7 product form: terminal type
3.2 structure and technical requirements
3.2.1 pad mounted transformer is a fully enclosed structure in which the transformer body, load switch, fuse and other equipment are uniformly designed and placed in the same oil tank.
3.2.2 box
3.2.2.1 the metal materials of the shell shall be subject to anti-corrosion treatment. The box body is welded. The box body shall not be deformed or damaged during lifting, transportation and installation. The default color of box is l6014.
3.2.2.2 all doors shall be opened outward, and the opening angle shall be greater than 90 °. The door shall be equipped with handle, concealed latch and concealed lock which can prevent rain, blocking and rust. The design size of the door shall match the size of the installed equipment.
3.2.2.3 the box body shall be equipped with sufficient natural vents and heat dissipation measures to ensure that the temperature of all electrical equipment does not exceed its maximum allowable temperature when operating under the general ambient air temperature.
3.2.2.4 the inclination of box top cover shall not be less than 3 °, and rain proof station eaves shall be installed.
3.2.2.5 the box base and all exposed metal parts inside and outside shall be treated with rust prevention and sprayed with durable protective layer. Doors, windows and vents shall be provided with measures to prevent dust and small animals from entering.
3.3.1 cables are used for high and low voltage incoming and outgoing lines of Pad mounted transformer
3.3.2 S11-M fully sealed transformer is selected as the transformer, which is produced by.
Temperature rise limit of transformer: when the transformer produces the maximum loss during the operation of negative limit tap rated capacity, the average maximum temperature rise of coil is ≤ 65K, the maximum oil temperature rise of top layer is ≤ 55k, and the local maximum temperature rise of oil tank is ≤ 80K.
Nominal insulation level and test requirements of transformer: 10kV winding: li75ac35; 0.4kV winding: ac2 five
3.3.4 HENGFENGYOU transformer insulating oil uses 25# transformer oil, and the transformer silicon steel sheet adopts high magnetic conductivity, high-quality grain oriented cold-rolled steel sheet and all copper winding.
3.3.5 adopt three-phase three column laminated iron core.
 
4、 Delivery Test of Pad mount transformer
HENGFENGYOU ELECTRIC carries out tests in strict accordance with the items and methods specified in Chinese national standards and industrial standards, and all test results shall meet the technical standards.
Type test items
General inspection; Insulation test; Temperature rise test; Mechanical test; Mechanical operation test; Main circuit resistance measurement; Dynamic thermal stability test; Making and breaking capacity test; Protection grade test; Rainproof test; Noise test; Shell mechanical strength test.
4.2 delivery test items
General inspection; Mechanical operation and mechanical characteristic test; Power frequency withstand voltage test; Inspection of instruments and indicators; High voltage main circuit resistance measurement and grounding circuit inspection.