Scb11-630kva10/0.69kv dry type transformer technical requirements
·Additional voltage: 10 ± 2 × 2.5% / 0.69kv
·No load loss is no more than 1070w
·Load loss is not greater than 5880w120 ℃
·Impedance voltage: 4%
·Additional frequency: 50Hz
·Phase number: 3 phases
·Wiring group: dymll
·Cooling mode: natural air cooling
·With enclosure, protection class.Ip2x
·With thermostat, with temperature protection function
·The no-load current, no-load loss and short circuit loss shall not be higher than the current national standard, and the bidder shall give detailed data. It shall not be less than level II (no load loss shall be no more than 1070w, and load loss shall not be greater than 5880w
120℃）
1 dry type transformer shall be able to operate under the environmental conditions of iec60076 rules, and the transformer device shall be indoor.
The service life of power transformer shall be at least 20 years under full load and maintenance conditions recommended by the manufacturer and under service conditions. No maintenance is required, the power transformer shall be able to operate for 30000 hours at continuous full load.
2. Transformer shall be equipped with Tianjin special transformer electrician, Guangdong Shunte and Shandong jinmanke company
Scb11 series products.
The whole transformer is assembled by core, high and low voltage winding, clamp, underframe, insulator, etc. the high and low voltage winding and iron core shall be reliably positioned.
3 the transformer body shall be grounded and welded on the guide rail base.
4 the body shall have lifting position.
5 iron core
In order to improve the core function, cold rolled grain oriented silicon steel sheet with high quality and high magnetic conductivity and low loss should be selected. The binding structure should be selected. The components should be balanced and tight. The surface should be coated with heat-resistant insulating paint to avoid the corrosion of the iron core, so as to make the iron chips tightly bonded, reduce noise and not loose due to the vibration during transportation and transportation.
6 winding
When the winding meets the requirements of interturn insulation, after heating and curing, all layers are bonded to enhance the mechanical strength of winding and ensure the insulation function.
The design of each winding makes the current and temperature evenly distributed along the winding, and makes the winding get the best voltage distribution when using full wave and cut-off shock. The winding can accept short circuit, overload and overvoltage without local overheating. The winding and lead wire are tied firmly enough to form a steel body to avoid relative displacement due to short circuit in transportation, oscillation and operation. Effective measures are taken to eliminate the concentration of electric field in winding, and the partial discharge level is satisfied with the requirements of GB and IEC.
All high and low voltage windings are copper windings.
7 insulation level
Relevant GB and IEC requirements.
7.1 the coil insulation layer shall be epoxy resin, and its insulation shall be tight, without porosity and even and consistent.
The lightning impulse receiving voltage shall conform to iec60076-3.
7.2 the insulation level is f.
8 temperature rise limit
Winding average temperature rise 100k (measured by resistance method)
9 all transformers are provided with shell, and the shell is welded with steel plate and electrostatic spraying. The protection grade is not lower than IP20, and it has reliable five prevention methods, lighting, temperature control equipment, heat dissipation and condensation prevention methods.
The transformer cabinet is equipped with the low voltage incoming cabinet, and the copper bar in the transformer cabinet is provided by the transformer manufacturer.
10 the color of transformer cabinet shall be consistent with that of low voltage cabinet.
11 the transformer shall be equipped with all accessories necessary for normal operation and mandatory rules in the annex to this skill.
12 inspection and experiment
13 the transformer shall be tested according to gb1094.1.2-1996, gb1094.3.5-2003 and iec60076.
14 factory test items
(1) Winding resistance measurement:
(2) Voltage ratio measurement and connection group mark verification
(3) Polarity experiment: to reduce polarity
(4) Insulation characteristic experiment: measurement of winding to ground insulation resistance;
15 field inspection and experiment items
After the transformer is assembled on site, the seller's skilled personnel shall guide the on-site skills, and the buyer shall organize the handover test according to the rules of national specifications. The supplier shall be responsible for handling the product quality problems presented in the handover experiment.
15.1 symbols
15.2 the nameplate shall list at least the contents required in iec60076-1 and the device shall be at the obvious place.
15.3 the nameplate shall be stainless steel or other metal which is anti-corrosion and fixed with corrosion-resistant willow nails.
15.4 the size and letter height of nameplates and equipment numbers shall be the manufacturer's specifications, unless the buyer's special rules.
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