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and its subsidiaries

User Guide DS50003460A-page 1

PIC32CXMTx

Microchip PIC32CXMTx Metrology User Guide

Introduction

This document explains how to use the Microchip Metrology library, and it is considered as a complement of the

Microchip Metrology data sheet. It describes the calibration procedure as well as other complex features of the

library, like the waveform capture.

For more detailed information, refer to the full description of the registers of the Microchip Metrology data sheet.

PIC32CXMTx

and its subsidiaries

User Guide DS50003460A-page 2

Table of Contents

Introduction.....................................................................................................................................................1

1. Configuration...........................................................................................................................................3

1.1. Current Conversion Factor...........................................................................................................3

1.2. Voltage Conversion Factor...........................................................................................................4

1.3. Swell and Sag.............................................................................................................................. 4

1.4. Pulse Test Constant..................................................................................................................... 4

1.5. CF Pulses.....................................................................................................................................5

1.6. Creep (Start-up/No load).............................................................................................................. 5

1.7. EMAFE......................................................................................................................................... 6

1.8. Other Features............................................................................................................................. 6

2. Calibration............................................................................................................................................... 7

2.1. Magnitude.....................................................................................................................................7

2.2. Phase Delay................................................................................................................................. 8

2.3. Power Offset...............................................................................................................................12

2.4. Conclusions................................................................................................................................13

3. Metrology Firmware Special Function...................................................................................................14

3.1. Waveform Capture..................................................................................................................... 14

3.2. Harmonic Analysis......................................................................................................................15

4. Monitor Metrology Firmware................................................................................................................. 16

5. Revision History.................................................................................................................................... 17

5.1. Rev A - 12/2022......................................................................................................................... 17

Microchip Information................................................................................................................................... 18

The Microchip Website..........................................................................................................................18

Product Change Notification Service.................................................................................................... 18

Customer Support................................................................................................................................. 18

Microchip Devices Code Protection Feature.........................................................................................18

Legal Notice.......................................................................................................................................... 18

Trademarks........................................................................................................................................... 19

Quality Management System................................................................................................................ 20

Worldwide Sales and Service................................................................................................................21

PIC32CXMTx

Configuration

and its subsidiaries

User Guide DS50003460A-page 3

1. Configuration

1.1 Current Conversion Factor

1.1.1 Current Transformer (CT)

KIx =Kcoil

GPGA × RLOAD

Where:

Kcoil is the CT transformer ratio

GPGA is the ADC current channel gain

RLOAD is the total burden resistance

Example:

If Kcoil = 1000, GPGA = 1 and RLOAD = 3.24 Ohm, then this is possible:

Klx = 1000 / (1 * 3.24) = 308.642

The metrology firmware uses uQ22.10 to represent both integer and fractional numbers; therefore, it is recommended

that this be set:

K_lx = ROUND(308.642 * 2^10) = 0x0004D291

1.1.2 Resistive Shunt

KIx =1

GPGA × Rs untℎ

Example:

If Rshunt = 100 uOhm = 0.0001 Ohm and GPGA = 8, then this is possible:

Klx = 1000000 / (8 * 100) = 1250

The metrology firmware uses uQ22.10 to represent both integer and fractional numbers; therefore, it is recommended

that this be set:

K_lx = ROUND(1250 * 2^10) = 0x00138800

1.1.3 Rogowski Coil

KIx =KRogowski (60 )Hz

GPGA

Where KRogowski(60 Hz) is Rogowski coil scale factor at 60 Hz.

Note: The scale factor KRogowski is defined at the reference frequency fr = 60 Hz because the DI (Digital Integrator)

filter was designed for unity gain at 60 Hz. If it is desired to use K

Rogowski defined at another frequency, the gain of the

DI filter must be accounted for in the computation as follows:

KIx =KRogowski ( )f

GPGA × _ ( )K di f

Where = 60 Hz/f.K_di(f)

For example, a Rogowski coil is used with an output of 500 uV/A at 60 Hz (or 416.6 uV/A at 50 Hz) and a G

PGA = 4,

then,

Produktspecifikationer

Varumärke:	Microchip
Kategori:	Inte kategoriserad
Modell:	PIC32CX2051MTSH128

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