ERT-400 Demonstration

Raptor Lift Solutions was given access to the Toshiba International Corporations (TIC) motor test facility in Houston from January 24th - 28th, 2020. Potential clients were invited to 2-hour sessions on January 27th and 28th where they were witness to our primary demonstrations:

  • 3-phase power loss for 5 seconds
  • Single-phase power loss for 20 seconds

Additional tests were completed on January 28th which would also be representative of common field events:

  • Single-phase power loss for 30 seconds
  • Three-phase reclosure, 2 seconds off/2 seconds on
  • Single-phase reclosure, 2 seconds off/2 seconds on

The test was designed to prove the ERT-400 can safely support the minimum voltage requirements to a VSD to maintain an ESP’s operation through power disturbances caused by weather, an overloaded grid, sags, etc. The test also highlighted various factors that affect the duration of ride-through events, such as AC input voltage and low voltage “trip” points of VSDs. All tests were carried out safely and without incident.

Test Setup

Table-ERT-1
Table-ERT-2

Test 1: Three-Phase Power Loss

  • 3-phase fault was created by using contractors on all three input phases
  • The VSD continued to operate during the 3-phase loss for 5 seconds at 200A
  • The VSD continued to operate after the 3-phase re-engaged and the ERT disconnected
  • A complete 3-phase loss is the most extreme form of power disruption, however still a possibility
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Test 2: Single-Phase Loss

  • Single-phase loss was created by using a contactor on one input phase while keeping the remaining two phases connected
  • The test demonstrated the VSD maintained operation during a single-phase loss for 20 seconds
  • The VSD continued to operate after the lost phase re-engaged and the ERT disconnected
  • A complete single-phase loss is the most common form of power sag
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Test 3: Single-Phase Loss

  • Single-phase loss was created by using a contactor on one input phase while keeping the remaining two phases connected
  • The test demonstrated the VSD maintained operation during a single-phase loss for 30 seconds
  • The VSD continued to operate after the lost phase re-engaged and the ERT disconnected
  • A complete single-phase loss is the most common form of power sag
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Test 4: Three-Phase Reclosure Event

  • 3-phase fault was created by using contractors on all three input phases
  • The VSD continued to operate during the 3-phase loss for 2 seconds off/2 seconds on ×3 at 200A
  • The VSD continued to operate after the 3-phase re-engaged and the ERT disconnected
  • A complete 3-phase loss is the most extreme form of power disruption, however still a possibility
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Test 5: Single-Phase Reclosure Event

  • Single-phase loss was created by using a contactor on one input phase while keeping the remaining two phases connected
  • The VSD continued to operate during the single-phase loss for 2 seconds off/2 seconds on ×3 at 200A
  • The VSD continued to operate after the lost phase re-engaged and the ERT disconnected
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Conclusion

The ERT-400 performed as expected, demonstrating its ability to effectively manage several different types of potential power disturbances. ERT-300, ERT-400, and ERT-500 are commercially available and sized for drive applications up to 300A, 400A, and 800A, respectively. The voltage drop in the ERT storage modules during the tests was between 100VDC to 150VDC depending on the type of faults, leaving between 528V and 578V available in the storage modules, representing 3-5 seconds of additional ride-through capability.