MTO300 Series | AUTOMATED SIX-WINDING TRANSFORMER OHMMETERS
The MTO3xx series also shares the Megger TTR300 series lead set. Users who test both turns ratio and winding resistance can save time and money since only one lead set is needed to connect to the transformer.
Model MTO330A is shown above.
- Automated 8-terminal/6-winding measurement capability
- Simultaneous winding magnetization
- Tests operation of on-load tap-changers
- Built-in auto-demagnetization feature
- Automatic discharge
- Power DB software (MTO330A)
The MTO3XX series delivers full eight-terminal/six-winding resistance measurement capability. It is designed to save time by testing all six windings without having to disconnect and reconnect leads. Also, the simultaneous winding magnetization(SWM) method gives fast and reliable measurements even on large transformers with delta configurations on the low voltage side. Additionally, the MTO3XX series leads are interchangeable with the Megger TTR300 series of three-phase turns ratio instruments which eliminates additional connecting time for turns ratio measurements.
The MTO3XX series consists of two models:
- The base model, MTO300, is designed to be remote-controlled via PowerDB software on an external PC or a Megger transformer test product with an onboard computer.
- The MTO330A offers the same functionality as the MTO300. The MTO330A is equipped with an industrial grade, 12-in. touchcontroller. The display is designed to operate in direct sunlight(1600 nits brightness), and all the components are rated to operate from -20°C to +50°C. An additional feature that has been added to the MTO330A is the "safety shutdown" which automatically saves results and properly shuts the controller down in the event of an abrupt power disruption, whether accidentally or on purpose.
APPLICATIONS
MTO3XX Transformer Ohmmeters are used to:
- Verify factory test readings.
- Help locate the presence of defects in transformers such asincreased contact resistance in terminal connections and tap changers
- Check the operation of on-load tap changers.
FEATURES AND BENEFITS
- Faster testing with a one-time connection principle measures all phases and windings without disconnecting or reconnecting leads.
- The "One clamp per designated bushing" concept significantly reduces the chance of operator error in making lead set connections.
- Automated eight-terminal/six-winding measurement capability saves time and eliminates the need for external jumper cables.
- Interchangeable lead set with the Megger TTR300 series of 3-phase turns ratio instruments saves time and money.
- DC test current up to 10 A.
- The built-in discharge circuit safely discharges the specimen when the test is completed. if the lead accidentally disconnects, or if power is lost.
- Built-in demagnetization circuitry allows the operator to demagnetize the transformer core upon completion of resistance testing, or as a stand-alone feature before SFRA testing, or when the transformer is put back in service.
- Custom PowerDB form for production heat-run (interval) testing.
- PowerDB software allows for data analysis and trending while in the field without the use of an external computer.
- The user can easily recall transformer setups from a custom settings menu with PowerDB.
- n PC interface via USB for remote control operation and downloading of test results for ease of use.