Technical specifications are a form of standard documents, which specify that products, processes or services should meet technical requirements.It can be a standard (i.e. technical standard), a part of a standard or an independent part of a standard.Its mandatory is weaker than the standard.When these technical specifications are legally confirmed, they becomeTechnical regulations。
Equipment specification
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1. The contract equipment includes all accessories and equipment purchased by the Seller from other manufacturers. These accessories and equipment shall comply with the requirements of the latest version of corresponding standards, specifications or regulations or their amendments. Unless otherwise specified, they will include any amendments and supplements valid during the bidding period.
2. Unless otherwise specified in the contract, the latest national standards (GB) andInternational Electrotechnical Commission(IEC) standards andInternational System of Units(SI) Standards.If joint venture or cooperative products are used, the national standards of the partner shall also be followed. If the above standards are inconsistent, the high standards shall prevail.
GB2706 High voltage electrical dynamic and thermal stability
GB311.1-311.6 Insulation Coordination High Voltage Test Technology for High Voltage Transmission and Transformation Equipment
GB/T13499-92 Electric powertransformerApplication guide
GB/T19001-94 Quality Assurance Model for Quality System Design, Development, Production, Installation and Service
These rules and standards are only the most basic requirements. If there are standards or parameters of the latest version, follow the latest standards.[1]
Technical performance specification
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1、noiseLevel: the measured sound pressure level of transformer body is less than 53 dB.
2. The transformer shall be able to withstand three phases at the outlet of low-voltage sideshort circuitWhen the bus on the high-voltage side is the short-circuit current supplied by the infinite power supply, the winding should not be deformed and the components should not be damaged.
3. When the ambient temperature is 40 ℃, long-term operation with rated load shall be met under AN operation mode, and emergency overload requirements shall be met under AF operation mode, with short-term overload capacity up to 140%.
4. The product has good heat dissipation performance and high mechanical strength, and will not cause coil surface during the service life of transformer due to temperature fusionCraze。
5. High voltage winding must be made of high-quality copperconductorWinding, high voltage coil pouring adopts vacuum pouring;
Low voltage winding is made of high-quality copper foil.
6. Silicon steel sheet shall be Nippon Steel or equivalent high-quality high magnetic conductivity silicon steel sheet.At the same time, 45 º full oblique joint and 7 step overlapping iron structure shall be adopted. The iron core surface shall be sealed and coated with Class F epoxy resin, and anti-corrosion measures shall be taken to avoid corrosion.
7. The iron core is grounded through a detachable grounding connector to ensure that the iron core is effectively and reliably grounded.
9. The product has good flame retardancy and has passed the tests of C2, E2 and F1 and obtained the corresponding certification certificate;
The product must pass the national energy-saving certification and obtain the relevant energy-saving certification certificate.
10. The configuration and layout of the transformer fan shall be reasonable, and the fan shall be able to be controlled manually or automatically, and different operating states can be achieved by operating the switch.
11. The transformer shall be equipped with temperature controller and temperature display, which shall include automatic controlFan(if equipped with cooling fan), temperature alarm and remote tripping (high high temperature function), temperature display adopts three-phase patrol inspection and setting detection mode, with RS485 data interface.
12. Temperature alarm relay, cooling fan and other control wiring shall be completed in the factory and led to the secondary junction box.
13. The control wiring section shall not be less than 1.5mm2, and the material shall be copper stranded wire with voltage not less than 600V.
14. The transformer shall be equipped with a protective shell, made of steel plate, with protection grade of IP21
15. The high voltage of transformer isCableFor incoming lines, there is a threading board at the bottom, which can be perforated according to the outer diameter of the cable on site.
16. Double doors shall be reserved on the front and back of the cabinet for full access to the equipment in the cabinet during maintenance.
17. The cabinet body shall be supported by solid steel, and all non current carrying parts such as the steel support frame of the shell shall be connected together.
18. The transformer shall be able to be put into operation at any time. Under the operating environment conditions specified in the specification, the transformer can be directly put into operation without drying after passing the insulation test after shutdown, and it is allowed to withstand 80% sudden load under normal ambient temperatureload。
19. The transformer shall be equipped with a nameplate, which shall be made of materials that are not affected by the climate and installed at a conspicuous position.
20. Routine test andType test(or provide type test reports of transformers of the same level).[2]
Technical parameter specification
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Rated frequency: 50Hz;
Rated capacity: 1000KVA
No loadRated voltageTransformation ratio: 10 ± 2x2.5%/0.4 kV
windinginsulationThe level is shown in the following table:
name
1 minute power frequency withstand voltage
(effective value) kV
Lightning impulse withstand voltage
(peak) kV
HV winding
thirty-five
seventy-five
Low voltage winding
three
--
Overload capacity is shown in the table below:
Overcurrent (%)
Allowable running time (minutes)
twenty
sixty
thirty
forty
forty
thirty-two
fifty
eighteen
sixty
five
General technical specification
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1. The construction shall be carried out in strict accordance with the design drawings and the requirements of the urban network transformation process.
2. Transformer terminal andwirewayNatural connection shall not make the terminal torsional.
3. All contact surfaces of connecting equipment must be well treated, coated with conductive greasemomentTighten the wrench.
4. The transformer shall be installed in strict accordance with the manufacturer's instructions and technical data. The work shall be carried out under the guidance of the manufacturer's personnel, and the foundation shall be leveled.
5、transformerThe installation works of shall be constructed according to the approved design.
6. When the transformer works on the bench, whether the line is powered off or not, the low voltage side switch shall be opened first, and then the switch shall be opened and droppedFuseCheck the power and ground on the high and low voltage leads of power failure.
7. Strengthen technical supervision, and conscientiously organize construction survey and line reconstruction data.
8. EquipmentGroundingThe installation of devices must comply with the design requirements:
① Adopt φ 10 round steel with horizontal buried depth of 0.8M;
② The grounding resistance of transformers below 100KVA is ≤ 10 Ω, and that of transformers above 100KVA is ≤ 4 Ω.[1]
