• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 79 subscribers
  • Views 362 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430F67791A: What modes or configurations are supported for 3-phase Power Meters?

Ngo The Manh
Prodigy 20 points
Part Number: MSP430F67791A
Other Parts Discussed in Thread: MSP430F6779A, MSP-EM-DESIGN-CENTER, EVM430-F6779, MSP430F6736A, TIDM-THDREADING

Hi, All
We are working to apply MSP430F6779a into our 3-phase power meter product. However, the requirement from our customer needs the device to support many modes, as well needs to support many measured values.
Please help me with following information:

1. Does this chip support following modes:
+ 3P4W (star load)
+ 3P3W (tri-angle load)
+ Mono phase
+ Split Phase
+ 2P4W (di-phase)
+ 3P star-Tringle Load Switching
(Detailed modes are described in attach figure)

2. Does this chip support to fully analyse information of 3-phase power like: voltage, current, PF, Frequency, power real, %THD current, %THD voltage, phase angle, ...


3. Can TI support us schematic design for the product which satisfies above requirement?

POWER METERING INTERCONNECTION SCHEMATICS 5mar20.pdf

  • 0
    TI__Expert 7365 points

    Hi Ngo,

    I will check with the relevant TI subject expert tomorrow, but from the device product page, it should support the different modes that you mention.

    As mentioned in the device product page, the energy measurement library at http://www.ti.com/tool/download/MSP430-ENERGY-MEASUREMENT should be able to analyse the different information of 3-phase power.

    We will be happy to review the schematics. 

    Srinivas

  • 0
    TI__Mastermind 49692 points

    Hi Ngo,

    Thanks for your patience. Our MSP430F6779A + MSP-EM-DESIGN-CENTER (also called EMDC) software library solution is ideal for 3-phase power or energy measurement designs because of it's flexibility, scalability and high number of ADC channels at seven. Let me address each one.

    Ngo The Manh said:
    + 3P4W (star load)

    Yes, this configuration is supported. The EVM430-F6779 evaluation board and EMDC software library support this configuration.

    Ngo The Manh said:
    + 3P3W (tri-angle load)

    The MSP430F6779A can support this configuration, but unfortunately we don't have an EVM or software library that supports it.

    Ngo The Manh said:
    + Mono phase

    Looking at the attached document above, this configuration is 1V1C plus neutral monitoring bringing it to 1V2C. Since each V (voltage sensor) and C (current sensor) requires one SD ADC channel each, three ADC channels would be required, so MSP430F6779A can support this. The similar MSP430F6736A could be used here instead since it has three SD ADC channels. EMDC supports both these devices and also this configuration.

    Ngo The Manh said:
    + Split Phase

    This configuration is 2V2C plus neutral monitoring bringing it to 2V3C. Since five ADC channels would be required, the MSP430F6779A can support this as well as EMDC.

    Ngo The Manh said:
    + 2P4W (di-phase)

    This configuration is 2V4C which would require six ADC channels, so the MSP430F6779A can support this. I'm assuming that our EMDC library can support this since it's very similar to two mono phase with two neutrals. Since you can calibrate each phase independently, it should work fine although I don't think we've ever tested it.

    Ngo The Manh said:
    + 3P star-Tringle Load Switching

    From your diagram, the MSP430F6779A should be able to support this configuration. However, our software library would only support the Y mode assuming the passives were selected to keep the input signals less than the device maximums. You would probably need to implement your own software to support this configuration.

    Ngo The Manh said:
    (Detailed modes are described in attach figure)

    Thanks. That was very helpful.

    Ngo The Manh said:
    2. Does this chip support to fully analyse information of 3-phase power like: voltage, current, PF, Frequency, power real, %THD current, %THD voltage, phase angle, ...

    Our F6779A device and EMDC support everything except THD. If you need THD measurements, you'd need to use our legacy IAR-based libary that's found in the TIDM-THDREADING design.

    Currently, we are evaluating adding THD support to EMDC in the future, so if you could share any IEC specs, accuracy or max harmonic (e.g. 50th) with us, that would helps us be sure to support the right things if we decide to support THD.

    Ngo The Manh said:
    3. Can TI support us schematic design for the product which satisfies above requirement?

    As Srinivas mentioned, we can definitely review the schematic. The schematics from our TIDM-THDREADING are an excellent reference for your hardware development. EMDC will actually check if your voltage divider, shunt, burden resistor output voltage exceeds the max ADC input voltage.

    Regards,

    James

**Attention** This is a public forum