Customization: | Available |
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Certification: | CE, ISO, CE, ISO, CE |
Customized: | Customized |
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1.1 TECHNICAL DESCRIPTION (Solution 1: MR VMIII 650/72D OLTC,with booster transformer ) | |||
1.1.1 GENERAL TECHNICAL DATA | |||
Highest voltage | 36kV | 50Hz | |
Operating voltage | 33 kV±5% | 50Hz | |
Voltage for aux. drivers | 380V | 50Hz | |
Control voltage | 220V | 50Hz | |
Interlock voltage | 220V | 50Hz | |
PLC signals | 24V | DC | |
Ambient temperature max./min. | 45 / - 10 | Deg. C | |
Altitude | 1500 | m | |
Humidity | 80 | % | |
1.1.2 TRANSFORMER DATA | |||
Operating voltage | 33kV±5% | ||
Frequency | 50Hz ±1% | ||
Operation | Continuously | ||
Rated capacity | 25 MVA + 20% Overload | ||
Rated primary current | 437.4 A (+ 20% Overload) | ||
Insulation level Winding: Um: AC: BIL: |
MV LV 52 kV 1,1 kV 95 kV 6 kV 250 kV - |
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Protection level | IP54 | ||
Vector group | D/d0 | ||
Secondary connection | Open Delta | ||
System short circuit capacity | 1500 MVA | ||
Secondary current | 35.042 KA (+ 20% Overload) | ||
Secondary voltage range | 480 -412--208 V (480 V at tap position 1) (See APPENDIX: Data for reference ) |
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Constant power | 480- 412 V | ||
Constant current | 412-208 V | ||
Regulation method | Constant flux, Tapping with booster transformer | ||
Short-circuit impedance voltage | 7.1 % (at LV max. Voltage 480V) 8.69 % (at LV 412 V) |
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Short circuit duration | 3 sec | ||
Type of tap changer | On-load , Oil Immersed Type | ||
Manufacturer | HM China (Shanghai Huaming) | ||
Model | M III-600 /72B-10193W | ||
Number of taps | 17 | ||
Winding Materials | Copper | ||
Cooling Type | OFWF | ||
a. Number of heat exchanger | 2 ( 1 work 1 standby ) | ||
b. Capacity of each heat exchanger | 100% | ||
c. Heat Duty | 400 kW (each cooler) | ||
d. Volume of flow water side/oil side | 30/ 65 m3/h (each cooler) | ||
e. Water inlet temperature (max.) | 35 ºC | ||
f. Water outlet temperature | 45 ºC | ||
Tank | Conventional Type (Drum type for OLTC) | ||
Temperature rise limitation | |||
Top oil temperature | 45 K (85°C) | ||
Winding temperature | 50 K (90°C) | ||
Core and metal parts | 60 K (100°C) | ||
Product executed standard | o IEC 60076IEC 60076 POWER TRANSFORMERS o IEC 60354 LOADING GUIDE FOR OIL IMMERSED POWER TRANSFORMERS o IEC 60214 TAP CHANGER o IEC 60044 CURRENT TRANSFORMER o IEC 60060 HIGH VOLTAGE TEST o IEC 60137 BUSHING o IEC 60270 PD MEASUREMENT o IEC 60412-60296-60599 MINERAL INSULATION OIL o IEC 60507 ARTIFICIAL POLLUTION TEST o IEC 60616 TERMINAL AND TAPPING MARKING o IEC 60551 DETERMINATION OF TRANSFORMER SOUND LEVEL. o IEC 60551 RADIO INTERFERENCE TEST ON HIGH-VOLTAGE INSULATORS |
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Reference standard | Arc furnace transformer standard JB/T 9640-2014 | ||
No load losses (At LV Max. Voltage) | 80 kW ( for core plate 27Q120 ) (Confirmed) 58 kW ( for core plate 27RK85) |
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Load losses at 75ºC (Tap 1 , 480 V, 25 MVA) |
170 kW | ||
Active part weight | ≈34 600 kg | ||
Copper weight | ≈71 000 kg | ||
Oil weight | ≈14 600 kg | ||
Transport weight | ≈56 500 kg (with oil) | ||
≈43 500 kg (without oil) | |||
Total weight | ≈63 000 kg | ||
Dimensions L×W×H | See Outline Dimensions and Assembly Drawing in detailed | ||
HV Bushings and LV Terminals | HV side: 3 porcelain bushings: 46kV/3150A BIL 250kV AC 95 LV side: Copper bus Plates on top of the tank, AC 6 kV |
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Conductor type of wiring | Continuously transposed conductor or copper flat | ||
1.1.3 Cooling system |
Double wall type cooler should have their individual circulation pump, and also coolers will be 1 in service the other 1 for stand-by | ||
2 coolers (3x70%) | |||
2 oil circulation pumps | |||
1 oil flow indicator for each cooler with two electric contact (1 alarm - 1 trip) | |||
1 water flow indicator for each cooler with two electric contact (1 alarm - 1 trip) | |||
2 Pressure gauges on each cooler 1 for oil 1 for water | |||
2 Thermometers for each cooler 1 for oil 1 for water | |||
Leakage detector with contacts 1 piece for each cooler | |||
1.1.4 On - load tap changer |
Manufacturer: HM CHINA (SHANGHAI HUAMING, CHINA FAMOUS BRAND) |
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Model: CMIII-600/72B-10193W , Oil immersed type OLTC with pressure relief valve. Oil filter should be applied. | |||
Nominal current : 600 A | |||
Um :72 .5kV | |||
17 Taps controlled by motor drive unit locally and remotely from the pulpit room, also operations by crank are possible for emergency purpose. Motor or hand operations are interlocked, So it is not possible to operate by hand and by motor at the same time. Selector switch for local and remote control with auxiliary contact. In the control box, two sets of contacts are provided for signaling the Tap Changer Positions and for controlling the electrodes. The detailed requirement is as following: N°1 On-Load Tap-Changer with electrical local panel for local/remote control complete with push buttons/selectors/relay and interface terminal blocks. Hand operation by crank has to be possible for emergency purpose. The following signals shall be provided but not limited. N°1 contact for "OLTC ready (when ready CLOSE)"; N°1 contact for "OLTC running (when running OPEN)"; N°1 contact for "OLTC not in position (when not in position OPEN)"; N°1 contact for "OLTC MOTOR - RUNNING FW (when running FW CLOSE); N°1 contact for "OLTC MOTOR - RUNNING BW (when running BW CLOSE). The control board shall include n°3 terminal strips for remote signaling of the transformer tap position: two of these terminal strips must be BCD type and the other one "break before make" type; |
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1.1.5 Monitoring and Protection Device |
1 Buchholz relay with 1NO contacts for alarm and 2 NC contacts for trip | ||
2 oil level indicators for two conservator-sections: 1 electric contact provides an alarm signal for the minimum admissible oil level for each section. |
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1 Top oil thermometer indicator with 2 NC contacts for TRIP and 2 NC contacts for ALARM. | |||
1 Winding thermometer indicator with 2 NC contacts for TRIP and 2 NC contacts for ALARM | |||
1 over-pressure relief device for main tank, Each will be with 2 contacts :one for alarm and the other for trip | |||
1 protective relay for OLTC with 2 contacts for TRIP | |||
1 Differential pressure switch for each oil-water heat exchanger to detect water leakage ALARM | |||
1 PT-100 for oil temperature indication of main tank | |||
1 Circuit breaker cooling pump for each pump | |||
1 Signal cooling pump running for each cooler | |||
1 Signal cooling pump failure for each cooler | |||
1 Circuit breaker for OLTC | |||
1 Signal OLTC running | |||
1 Signal OLTC failure | |||
Tap changer in progress signalization | |||
1 Circuit breaker for OLTC Oil Filter (to be kept) |
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1.1.6 Current transformer for electrode control |
Matching Current transformers inside the tank 3 pcs. 439/2.88 A 50 VA for metering and for LV current control, for LV equivalent ratio of 50000/√3 //5/√3A. They located on the line of tap winding for series transformer primary winding. The current ratio must be comply with 20% overload. | ||
Current transformer 1 pcs. 800./5 A 50 VA Class 1 for winding temperature on primary winding B phase. | |||
1.1.7 Control box (Auxiliary Cabinet) | 1 control box containing electrical components for control of the cooling pump and for installation of the matching transformer for the secondary current measurement. | ||
1 control box containing electrical components for the OLTC motor drive and oil filter. | |||
1 control box containing electrical components for signals terminal of the other protective devices.( Merged in cooler control panel) | |||
1.1.8 Valves | various valves | ||
1.1.9 Wheels | 4 set flange wheels with bidirectional | ||
1.1.10 Oil conservator | Double chamber construction for transformer and OLTC. | ||
1.1.11 Painting and Color | Painting thickness is 120-160um; Color RAL 7033 | ||
1.1.12 Noise Level | 80 dB(A) | ||
2. All accessories on the transformer |
All the other accessories in the followings will be added to transformer 2 Silica-gel breather (for the two conservator sections) 2 valves for removal of the conservator filled with oil 1 set of oil drain filtering and sample valves 4 lifting lugs for core & coils 4 lifting lugs for the complete transformer 1 rating plate 2 grounding terminals for tank |
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3. Testing |
Routine test according to IEC standards are included as flowing: Appearance Check Voltage Ratio Test Winding Connection Group Measurement Winding DC Resistance Measurement Insulation performance measurement, including insulation resistance, absorption ratio and medium consumption angle tangent value are required. Transformer Oil Test Induced Voltage Test Applied Voltage Withstand Test and Impulse Test No-load Test Short-circuit Test Tank Oil Leakage Test Core Insulation Resistance Noise Level Test Frequency Response Test |
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Remark | 1.)Tank, Conservator and Cooler is vacuum proof 2.) Gaskets between cooler flange and transformer flanges should be supplied. 3) The RC and arrestor in primary must be installed by user; and C filter unit and fuse with support in secondary side should be installed, but the buyer pays the charges in additionally. |