CMM-6/7 Degassing Unit

The CMM-6/7 machine is used for the following purposes: heating, pumping and treatment of oil used as insulators or coolers...
    Advantages
    • versatility;
    • no need to use adsorbents for transformer oil drying;
    • no air pollution and no waste streams to dispose of or store;
    • simple operation and servicing;
    • best oil quality even after one processing cycle;
    • low power requirements;
    • low noise levels.

     

     

The CMM-6/7 machine is used for the following purposes:

  1. heating, pumping and treatment of oil used as insulators or coolers in electrical equipment (transformers, OLTC , transformer bushings, high voltage switches etc). The oil treatment includes removal of particulate matter, gas and water.
  2. removal of air and gas from transformer tanks, if the gases enter the transformer in the course of repairs or servicing.

The processing capacity of the machine is 3000 to 7000 liters per hour and depends on the selected mode of operation.

Design of the machine

The CMM-6/7 is built in a container. The container houses all the components of the machine:

  • a cylindrical chamber, from which air is removed to reduce pressure and create vacuum;
  • the components removing the air from the vacuum chamber (the booster and backing pumps);
  • oil pumps;
  • an oil heater;
  • components that remove particulate matter from the oil (coarse and fine filters;
  • a control system (control buttons and lights).

Operation of the machine

The CMM-6/7 machine is multifunctional, i.e. it has several operation modes.

The simplest mode is oil pumping. Only the filters and the pumps are engaged in this mode.

The second mode allows to heat the oil and remove particulate matter. First, the pump transports the oil to the heater. Then the oil passes through the filter. In the end, filtered warm oil is pumped to the outlet of the unit.

In the degassing mode the oil is pumped through the heater, where its temperature is increased to 50-55°С, then it goes into the filter section. From the filter, the oil goes into the metal chamber, where the vacuum pumps remove the air and the pressure is low. The chamber is equipped with special filler, which is necessary to increase the surface area of the oil. As the oil passes along the filler, the vacuum and heat extract water and gas from the oil.

In the evacuation mode the machine is connected to external equipment by a hose, then the vacuum pumps remove air from that equipment.

Operator involvement

The degree of operator involvement in the operation of the CMM-6/7 varies depending on the automation of the machine, which is chosen by the client at the time of order placement (there are fully automatic and automation assisted options). In general, the operator starts the machine and selects the required mode of operation.

In the basic version, the operator also sets and adjusts the processing rate by turning manual valves. In the case of a fully automatic version, the processing rate is selected by the operator on the control panel  and is maintained automatically with no further human interference.

Safety

The safety of the CMM-6/7 is ensured by control of the physical oil treatment process parameters and special protection measures:

  • electrical protection from overcurrent and overloads;
  • protection against oil leaks due to hose rupture or overheating of oil;
  • protection of possible process control device failures;
  • protection against power supply cable break.

If a protection trips, the system turns on a siren and notifies the operator of the failure. The control system safely stops the machine if process parameters exceed limits.

Who this machine is designed for

The CMM-6/7 is built for transformer manufacturers, as well as service and repair facilities for equipment which contains insulation oil.

Parameter

Value

Capacity, m3/hour, not less than

 

– degassing, drying and filtration mode

2-6

– heating and filtration mode

2-7

* Processed oil parameters:

 

– gas content, % vol, max

0,1

– water content, ppm, max

10

– ISO 4406 purity class

16/14/12

Max oil output temperature in heating mode, ºС

90

Outlet pressure, MPa

0,2

Max heater power, kW

100

Max power consumption, kW

115

Residual vacuum chamber pressure for degassing, Pa, max

267

Residual vacuum chamber pressure for seal test, Pa, max

26,7

Max air leak in 1 hour seal test, Pa

267

Power supply

 

– voltage, V

400

– frequency, Hz**

50/60

Dimensions, mm (w/o trailer / with trailer)

 

– length

2600/3750

– height

1250/1840

– width

1500/1940

Weight, kg (w/o trailer / with trailer)

1100/1500

* Note –  Initial oil quality parameters:

  • gas content: below 10.5% vol
  • water content: below 0.005% (50 g/t)
  • temperature: above 0 ºС.

**All equipment sold in the USA is designed to operate on 60 Hz AC Power

Equipment configurations that are not included in this configurator can be implemented via a separate request to [email protected].

Aplication : Transformer oil

  • versatility;
  • no need to use adsorbents for transformer oil drying;
  • no air pollution and no waste streams to dispose of or store;
  • simple operation and servicing;
  • best oil quality even after one processing cycle;
  • low power requirements;
  • low noise levels.

 

 

Equipment configurations that are not included in this configurator can be implemented via a separate request to [email protected].

Aplication : Transformer oil

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Manual performance adjustment by valves (or smooth performance adjustment, see option). Functioning in semi-automatic modes. Stepped or smooth (see option) oil heating. PLC control

Automatic performance adjustment. Functioning in automatic modes. Smooth oil heating. Control from PLC + HMI

Frame open design

Shell is available

Performance adjustment with manual valves

Performance adjustment of the vacuum pump is executed with a regulator on the control panel by means of a valve with an electric drive. Visual monitoring of the flow rate is by the flow meter indicator

Performance adjustment of the vacuum pump is executed by setpoint selecting at the control panel screen for maintaining the level in the vacuum column. Setpoint is kept constant by means of a valve with an electric drive. Pump operation is smooth throughout the entire control range. There is a digital meter to control oil flow

The controller program switches the heater stages by contactors according to the algorithm. Operator sets the temperature and it is kept constant automatically

Solid state relay (SSR) adjusts the heater stages' current smoothly and non-contactly. The P-Int-Derivative Controller

Online monitoring the transformer tank oil level. Automatic shutdown of the procesing unit and automatic block of the oil hoses in case of an accident. Automatic performance adjustment option. Automatic smooth direct heating option

The language of text at the controller screen, devices, controls and the language of the technical documentation is English

The language of text at the controller screen, devices, controls and the language of the technical documentation is upon customer's request

Option to select the fine filter contaminant capacity

Option to select the fine filter contaminant capacity

Option to select the fine filter filtration degree

Option to select the fine filter filtration degree

Mechanical flow meter with total flow display

Digital flow meter with current and total flow display

Power supply analyzer displays the current, voltage, frequency by phases and other parameters

Industrial warmer with forced heat exchange to avoid condensation in the control cabinet

Capacitive transducer determines the activity of water dissolved in the oil and converts it into the absolute moisture content of the oil which entered the unit

Capacitive transducer determines the activity of water dissolved in the oil and converts it into the absolute moisture content of the oil which was processed by the unit

Capacitive transducer determines the activity of water dissolved in the oil and converts it into the absolute moisture content of the oil which entered the unit and which was processed by the unit

Sealing material: valve, rings, pump, gaskets

Sealing material: valve, rings, pump, gaskets

Four-wire flexible copper cable for external power supply

The cable is fitted with an industrial sealed connector, consisting of an internal plug and a cable socket

The cable wires' ends are fitted with a crimp terminals

The cable is fitted with an industrial sealed connector, consisting of an internal socket and a cable plug.



Equipment configurations that are not included in this configurator can be implemented via a separate request to [email protected].

Aplication : Transformer oil

Equipment configurations that are not included in this configurator can be implemented via a separate request to [email protected].

Aplication : Transformer oil

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СММur-2L
CMM-4
CMM-4/7
CMM-6/7
CMM-10/15
Equipment configurations that are not included in this configurator can be implemented via a separate request to [email protected].

Aplication : Transformer oil