Power packs

Baker 30, Baker 40 and Baker 85 power packs

Power packs
The Baker 30, Baker 40 and Baker 85 power packs are high-powered impulse generators used to test very large, high-voltage windings. Output is controlled by a variable transformer that ranges from 2,000 volts up to a maximum of 40,000 volts (Baker 30 and Baker 85 - 30,000 V; Baker 40 - 40,000 V).

These units perform both surge and DC/hipot tests when used with the Baker D12R or Baker AWA-IV 12 kV (Baker 30) as the control and display. They incorporate a supply monitor for safe operation from a well grounded supply. In addition, 60kV rated test lead cables are provided.

A key element of the surge test circuit is a grounded grid hydrogen thyratron tube. The tube conducts very high peak current (thousands of amps). Such high instantaneous currents are needed to fully test very low impedance windings of large motors or form wound coils. This current is only produced for a few microseconds by the discharge of a 0.1 microfarad capacitor.

Voltage rise time is 100-200 nanoseconds, so the power packs comply with IEEE Standard 522-2004 and IEC Standard 34-15 when testing motor windings and coils.

The DC hipot test can also be done with the power packs along with the Baker D12R or Baker AWA-IV 12 kV (Baker 30). Test voltages are set by the output control from 2,000 to 40,000 volts. Current is displayed and a trip circuit monitors the test. If current exceeds the trip level, the test is automatically halted. In its most sensitive setting, the protective circuit will operate as low as 10µA.

In addition, the Baker D12R or Baker AWA-IV 12 kV will also monitor current. This provides a redundant level of safety for the DC hipot test.

The power packs are housed in a mobile case on pneumatic wheels. They provide power and accessory connections from the Baker D12R or Baker AWA-IV 12 kV, as well as lead storage in a convenient portable unit. These features make these power packs powerful testers.

Baker 24 power pack

The Baker 24 power pack is a high-performance impulse generator that is capable of testing high voltage windings. The output is controlled by a variable transformer from 2,000 V up to a maximum of 24,000 V.

The Baker 24 performs both surge and DC/hipot tests when used with the Baker AWA-IV 12, Baker AWA-IV 6, and Baker DX units as the control and display. It incorporates a supply monitor for safe operation from a well-grounded supply. In addition, 45 kV rated test lead cables are provided.

The surge generator is designed to provide IEEE 522-2004 compliant test voltages. The key design element of the surge test circuit meets the requirements for IEEE 522-2004 compliant test voltages. The tester supplies 0.1 to 0.2 mS voltage pulses to the coil or winding under test. Voltage rise time is 100 to 200 ns (0.1 to 0.2 ms), so the Baker 24 complies with IEEE Standard 522-2004 and IEC Standard 34-15 when testing motor windings and coils.

The DC hipot test can also be done using these power packs. A test voltage is set by the output control from 2,000 V up to 24,000 V. Current is displayed and an over-current trip circuit monitors the test. If current exceeds the trip level, the test is automatically halted. In its most sensitive setting, the protective circuit will operate as low as 10 mA. In addition, the host unit monitors current. This provides a redundant level of safety for the DC high potential test.

The Baker 24 provides power and accessory connections from the host unit. These features make the Baker 24 a powerful and advanced impulse generator.
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