Megger ADX15, Руководство пользователя

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www.megger.com Megger Baker ADX User Guide
44
Test Configuration
RLC Tests Section
In the RLC Tests section, define the target values for each test type along with the allowed variations. When the test is
run, the software will indicate a test failure when the collected measurement is outside of the specified limits for that
particular test.
1. Start by selecting which tests leads to enable during the test. All three leads are selected when testing three-phase
systems as a complete circuit. Other assets—such as DC motors or coils—use only two leads.
2. Select which tests to include by moving the associated test toggle to the right (green).
3. Check boxes to select individual test elements if you know the proper Target and Variation values for the Asset.
4. Enter values directly into the specification fields.
The software allows you to specify different target and variation values for each test lead for resistance and inductance
test parameters.
For resistance testing, you can enable Imbalance Limit testing, select the method to use, and specify the limit
percentage for the test.
You can enable Temperature Compensation and specify the winding conductor material to ensure the proper
compensation parameters are applied to the test. Then, you can specify a default value for the Correct To temperature
field.
Temperature Compensation
Temperature compensation is used to make the reference temperature thresholds meaningful. Without compensation,
the value could not be compared to the threshold because the value of the threshold for individual resistance is defined
at a specific temperature (for example, 0.123 Ω at 25° C). So, whatever temperature the winding is will likely need to
be corrected to make the comparison meaningful.
Three-phase imbalance is not affected by temperature correction.
The analyzer will correct the coil resistance tests to the value entered in the Correct To field. By default (when creating
a new Test Configuration), this value is 77° F (25° C) in compliance with IEEE 118.
NOTE: Depending on the installation in which the tester is used, the Temperature Compensation fields
will be displayed in the scale (Fahrenheit or Celsius) commonly used in the region.
NOTICE: Because the information collected during testing is commonly used for identifying trends, it is
crucial to ensure that values specified in testing are used consistently.
Setting Individual Lead Limits
Values entered into the Target and Variation fields for individual lead limits come from the asset manufacturer’s
specifications. Refer to those specifications when defining test parameters. If you do not know or do not have access
to these specifications, leave the fields blank and the Lead Limit boxes unchecked.
Another approach would be running a test on a known-good asset then using the results collected to establish base
values that can then be used to define the target values and set tolerances.
Limits should only be used when an accurate Corrected To temperature is used; at an expected temperature, target
resistance values can be established, along with limits. These values change with different temperatures.
Inductance test provides a Frequency drop-down list so you can select the desired frequency for testing. 120 Hz is