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Power System Services & Relay Protection

Our consultants are specialised on relay and protection
applications for primary substations, high voltage direct
current (HVDC) and connecting new energy sources to the grid

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10/11 2023

Fault Passage Indicators in the News

Would you like to know more about fault passage indicators that uses three phase currents only to detect downstream faults? Please read the following articles which discuss the subject more in detail.

2/5 2023

New Product Guide

Finally our brand new product guide is available!

You can find it here: Product Guide 2023

5/9 2022

Primary earth fault test!

Ensto Protrol has recently had the opportunity to participate in a primary earth fault test organized by KSS Energia and Ensto in Finland. An IPC4022 and LOFA sensors for over head lines were used in this field test.

The fault detector registered 0.6 A earth fault currents with correct direction to the fault. This current corresponded to
16 kohm fault resistance.

More information is available at
24/8 2022

LED indicators for Automation

Our film crew has produced a short description of how the local LED indicators are activated after the detection of an overcurrent or earth fault in an open loop.

The Automation function is an option for the standard product. In short it means that it autonomously lets the IPC402x devices isolate the faulty cable segment and subsequently close the open point. The local LED indicators are used in an alternative way when the Fully automated fault isolation and power restoration option is in use.
14/7 2022

Fully automated fault isolation and power restoration

We have now made a short movie to visualize fault isolation and power restoration.

In this movie, we use our simulation panel to simulate a line fault. The two IPC devices on both sides of the fault open their circuit breakers and command a closing of the open point for the shortest possible disturbance of affected customers.
14/6 2022

Casted Split Core Current Transformer

Another customer case has resulted in a powerful split core current transformer of casted type for larger cable diameters. The secondary current cable is shielded to minimize electromagnetic disturbances.

Assembly on the primary cable is done without any tools.

For datasheet - see Support -> Documents
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30/5 2022

TFR Plotter

We have the great pleasure to introduce a new software tool that assists visualising Protrol disturbance files.

It is now easier than ever to analyze the faults in your distribution grid.

See Support -> Downloads (registration is required)
Extra IO for IPC4020
29/3 2022

More I/O for IPC - PDCIO

IPC4020 and IPC4020exp has already 16 binary inputs and 8 binary outputs - but in some cases more than that are needed. PDCIO is a compact and scalable I/O extension for your IPC when there are plenty of I/O in the secondary substation.

PDCIO is configured using the web settings of the IPC, both locally in the secondary substation and at the remote control location.
8/3 2022

LoRaWAN interface

The new PxL is a communication interface for LoRaWAN 868 MHz. It has a serial interface to connect to the IPC402x series of fault detectors.

Please contact us if you need a cost-efficient data acquisition using LoRaWAN.
17/12 2021

Ensto has acquired a majority stake in Protrol

The Finnish technology company and family business Ensto has acquired a majority stake in Protrol AB. The transaction brings growth opportunities for both companies, their personnel, customers and partners. Our daily operations and cooperation with our customers and partners continue as usual in both companies.

Protrol will operate under the name Ensto Protrol AB, and Torbjörn Karlsson continues as Managing Director.

Protrol Engineering AB is not affected by the transaction.
25/9 2019

Protrol visits State Grid

In the Nordics, Protrol is well knowned to have the most efficient solution to identify earth faults in high impedance grounded networks.

The method is also useful in isolated networks, a fact that was thoroughly discussed in a seminar arranged  by State Grid in September. Protrol is grateful to the hosts and all the interested listeners that participated during the seminar.
5/5 2019

Automatic Fault Isolation and Power Restoration in Härryda Grid

Protrol has together with Härryda Energi in Sweden performed  primary faults in Härrydas "Self-sectionalizing grid", an open loop with eight secondary substations equipped with circuit breakers and distributed fault isolation.

IPC, the detectors with remote terminal function, identified the faulty cable segmen fast and distinctly, allowing the circuit breakers in the proper secondary substations to isolate the fault, before the feeding primary substation operated. Finally the open loop was closed, keeping power to the end users.
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10/3 2017

Protrol first page news in ERA

Article in ERA about Protrol and automation in the distribution network!

Read more

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20/12 2016

Frame Agreement Göteborgs Energi AB

Protrol is the single supplier that assigned a frame agreement for fault detectors that recently was procured by Göteborgs Energi AB.

Read more

Om the Company

Welcome to Protrol...

...Our products increase the availability of your grid

About Protrol AB

Protrol is a product and consulting company within power and automation technologies for power grids.

​​​Protrol's products are developed for cost effective control, supervision, and fault detection in both small and large secondary substations. The products are based on patent protected technology and are manufactured in local markets.

Read more about us