Transformer Oil Purification Plant CMM-2.2
|1 Minimum capacity, l/h|
|– thermo-vacuum drying and filtration mode||
|– filtration and heating mode||
|2* Processed oil parameters:|
|– total max has content, %||
|– max moisture content, g/ton||
|3 Max oil temperature at unit output, ºC||
|4 Output pressure, MPa||
|5 Oil heater max power, kW||
|6 Max power consumption, kW||
|7 Electric power supply|
|– voltage, V||
|– frequency, Hz||
|8 Dimensions, mm|
|9. Max weight, kg||
- gas content by volume – below 10.5%
- moisture mass content – below 0.005% (50 g/tonn)
- temperature – above 0ºC.
1 – vacuum chamber; 2 – input pump; 3 – output pump; 4 – pipelines; 5 – oil heater; 6 – fine filter; 7 – vacuum pump СР 30-620; 8 – control panel
Mesh filterA mesh filter at the unit’s inlet removes solid particles from the oil. Fineness of filtration is defined by the 200 micron brass mesh secured in the filter’s case. To rinse the filter element, remove it from the inlet and rinse in clean transformer oil.
Oil pumpsThe pumps Calpeda type NM 2 and 3 input and output oil to and from the unit respectively. The pumps are controlled from the control panel.
Fine and coarse cartridge filtersFine and coarse cartridge filters remove solids from processed oil. Filtration fineness are 5 and 25 micron respectively.
1 – oil inlet; 2 – filtered oil outlet; 3 – contaminant drain valve; 4 – filtering element; 5 – air release valve; 6 – magnets; 7 – hold down screw The device consists of lid and frame, which supports FE-16, FE-28 type filtering element. The lid is equipped with a valve which allows to release air from the filter when it is filled with oil and to let air in when the oil is drained form the filter. Oil inlet and outlet are welded to the case. The replace filtering elements (cartridges), drain contaminants from the filter by opening the valve 3. Turn the handle 7 of the pressing screw several turns counter-clockwise, turn the lid’s stock in the same direction against stop, then remove the lid from the filter, unscrew the hold down nut and remove filtering element. Install the new cartridge, secure it with the hold down nut. Install the lid back on to the filter by repeating the steps above in reverse order.
Oil heaterThe heater is a vessel with a total of 53 kW heating element. The heater is equipped with input and output lines and a drain valve. Refer to Figure 4.4 for general view of the heater. The heater is controlled from the control panel. Oil temperature is controlled by the temperature controller, which receives signals from thermistor TP, and thermostat TS (see Fig. 4.7) An interlock flow relay prevents heater operation with no oil flow to protect the heater from damage.
1 – heating section; 2 – cold oil inlet; 3 – hot oil outle
Vacuum chamberThe vacuum chamber 1 is designed for thermal vacuum drying of transformer oil. Ball valve K3 is attached to the column for connection to the vacuum system, as well as vacuum meter VM, level sensors L1 – L2, a visual oil level control indicator and foam sensor OS. The oil enters the column through the inlet, then flows to the activator filter and the outlet. The design of the sprayer facilitates intensive emission of gas and water from the oil during processing.
1 – inlet; 2 – vacuum system connection; 3 – activator filter (sprayer); 4 – processed oil outlet; 5 – level sensors; 6 – sight glass7 – visual level indicator
Vacuum pumpThe vacuum pump VP is installed to create the necessary vacuum in the system. The vacuum pump is connected to the vacuum chamber CV by pipelines.
Vacuum pump type СР 30-620
Vacuum trapVacuum trap R is designed to prevent oil from entering the vacuum system. It has a ball valve (K14) for oil drain.
Control cabinetThe control cabinet contains electric components required for unit operation. The cabinet features lockable doors. The panel inside contains control and communication circuits. The cabinet is equipped with control buttons and lights.
|Pos||Name/Purpose||Designation in the electric diagram|
|1||Controller Mitsubishi α2||U4|
|2||Heating mode select button||S6|
|3||Operation mode select button||S7|
|4||P1 pump start/stop button||S2|
|5||P2 pump start/stop button||S3|
|6||VP vacuum pump start/stop button||S4|
|7||Sound signal acknowledge and alarm reset button||S5|
|8||Emergency stop button||S1|
|9||Correct connection indication||LD4|
|10||Power supply indication||LD3|
InstrumentsThe unit is controlled by the Mitsubishi α2 controller with the help of the following instruments:
- contamination of filtering elements in cartridge filters F1, F2 and unit output pressure can be monitored on manometers М1-М3;
- vacuum is controlled by vacuum meter VM and vacuum relay;
- oil level control in the vacuum column is controlled by level sensors and foam senso;
Oil heater is controlled by the following systems:
- thermostat disengages oil heater when oil temperature exceeds preset maximum;
- the flow relay disengages oil heater when no oil is flowing through the heater;
- temperature controller manages processed oil temperature at the output of the heater
Flow diagramСV – vacuum chamber; P1 – P2 – pumps; K1 ÷ K16 – ball valves; SV1 ÷ SV3 – electromagnetic valves; MN – oil heater; ВV1 ÷ ВV4– check valve; F1, F2 – cartridge filters; М1, М2, М3– manometers; VМ – vacuum meter; РП – flow relay, ТP – temperature controller sensor; TS – thermostat; L1 ÷ L2– level sensors; OS – foam sensor; VP – vacuum pump; РF – mesh filter; RV – vacuum relay; FV – moisture separator; R – trap; CL1 – oil inlet; CL2 – oil outlet. The unit can be used in the following modes:
- “Heating and filtration” (H&F);
- “Thermovacuum oil drying” (Dry);
- “Vacuum evacuation of equipment” (Vac);
- vacuum chamber СV;
- oil pump P2;
- cartridge filter F2, check valve ВV2;
- ball valve K4 and check valve ВV4, valve K2 closed;
- oil heater MN;
- cartridge filter F1 and electric valve SV1.
Vacuum equipment evacuation» mode (Vac).In this mode the unit evacuates air from third party equipment with the vacuum pump VP. In this mode, the VP pump may be controlled. Pumps P1, P2 and the oil heater are locked out.