Omicron COMPANO 100 - User Manual

Application Note
Cable Impedance Measurement with COMPANO 100
Author
Josef Schmidbauer | josef.schmidbauer@omicronenergy.com
Date
Jan. 10, 2024
Related OMICRON Product
COMPANO 100
Application Area
Cable Impedance Measurements
Keywords
Cable Impedance, k-factor, Line Impedance
Version
v1.0
Document ID
ANS_23003_ENU
Abstract
This application note explains how the impedances and the k-factor of short power cables (up to 5 km) can
be measured with COMPANO 100. Such cables are very common in urban distribution networks and
industrial energy networks.
The results can be used for configuring protection relays, performing load calculations or for network
simulations.
For longer cables or overhead lines, use CPC 100 + CP CU 1.

Omicron COMPANO 100 Specifications

General

Category	Test Equipment
Power Output	75 VA per channel
Accuracy	0.1 %
Output Voltage	0 to 300 V
Binary Inputs	4
Weight	Approx. 9.8 kg / 21.6 lbs
Interface	Ethernet, USB
Frequency Range	15 Hz – 450 Hz

Summary

Safety Instructions

Safety Accessories

Details on accessories for enhanced safety during test operations.

General Safety Precautions

General safety guidelines and precautions for operating the test equipment.

Operating the Measurement Setup

Procedures and safety measures for operating the measurement setup.

Handling Long Cables

Guidelines for safely handling long cables during measurements.

Orderly Measures

Administrative and procedural measures to ensure safe work practices.

Disclaimer

Statement regarding equipment usage and manufacturer liability.

Introduction to Cable Impedance Measurement

Safety Concept for Measurements

Explanation of the safety concept for protecting users and equipment.

Handling the CP GB1 Grounding Box

Instructions for the correct handling and maintenance of the CP GB1.

Measurement Method Explained

Description of the frequency selective method used for cable impedance measurement.

Connecting and Preparing for Measurement

First Criterion: Cable Length

Check for cable length less than 5 km as a primary criterion.

Second Criterion: Estimated Open-Cable Voltage

Procedure to estimate open-cable voltage for measurement preparation.

Third Criterion: Measured Open-Line Voltage

Steps to measure and verify the actual open-line voltage.

Fourth Criterion: Injected Test Current

Process for injecting the test current using COMPANO 100.

Performing and Evaluating Cable Impedance Measurements

Measurement Setup

Instructions for setting up the measurement environment and equipment.

Loading Configuration Templates

Guidance on loading predefined configuration profiles for measurements.

Performing the Measurement

Detailed steps for conducting the cable impedance measurement with different loops.

Evaluation of Measurement Results

How to evaluate the measurement results using an Excel spreadsheet.

Final Results and Interpretation

Final results and interpretation of physical model impedances and k-factors.

List of Literature