How to make the right selection of a digital transducer for power system measurements
The accurate measurement of the voltage, current or other parameter of a power system is a prerequisite to any form of control, ranging from automatic closed-loop control to the recording… Read more
Aug 19, 2020 | Edvard
IEC and NEMA/IEEE ratings of current transformers (CTs) in medium voltage applications
First, let’s remind ourselves of the basics in a few sentences. That is something you must know. A current transformer (CT) is designed to produce a secondary current which is… Read more
Jan 20, 2020 | Edvard
Four special connections of current transformers in relay protection applications
As you should already know, current transformers are used for metering and relay protection purposes. When we are talking about current transformers used for metering, their performance is of interest… Read more
Dec 02, 2019 | Edvard
Field devices and signals used for LV SCADA operations
At low voltage level, SCADA applications are usually used for process control and monitoring of equipment. Furthermore, incoming circuit breakers or switch disconnectors inside large LV switchboards may also be…...
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Sep 05, 2019 | Miodrag Kokotovic
Have you experienced an incorrectly specified CT that can’t be manufactured?
When a CT manufacturer says that he is unable to manufacture the requested CT, nine times out of ten this is because the CT has been incorrectly specified. To eliminate… Read more
Mar 07, 2018 | Edvard
Top six solutions to achieve a high level of energy efficiency in buildings
Energy efficiency in commercial buildings involves providing a given level of performance, cost, quality, availability, and comfort at a minimal level of energy usage throughout the lifecycle of a given… Read more
Mar 27, 2017 | Edvard
Basic three phase power measurements explained in details
Although single-phase electricity is used to supply common domestic and office electrical appliances, three phase alternating current (a.c.) systems are almost universally used to distribute electrical power and to supply… Read more
Jan 13, 2017 | Edvard
A case study of 110/10 kV substation with centralized protection, automation and control system
Centralized substation protection and control has been attempted in the past based on the available technology. This evolution is now at the intersection of sensing, protection and communication technologies, providing… Read more
Dec 21, 2016 | Edvard
9 rules for correct cabling of the Modbus RS485 communication systems
The cabling of the industrial communication systems (Modbus RS485) is different in some ways from the cabling used for power cabling and the electrician may experience some difficulties if he is not… Read more
Dec 07, 2016 | Edvard
Direct and indirect measurements using CTs and VTs
In order to measure electrical quantities, the measuring instruments must be connected to the lines safely, with maximum simplicity and convenience. Generally, the fundamental parameters to be detected are voltage… Read more
Aug 31, 2016 | Edvard
Basic measuring of resistance, voltage and current using digital multimeter
Digital multimeter has generally replaced the analog-type multimeter as the test device of choice for maintainers because they are easier to read, are often more compact and have greater accuracy…. Read more
Aug 15, 2016 | Edvard
Using digital multimeter for testing the charging system of your car
To be honest with you, this article is about testing the car charging system and it isn’t applicable on new Tesla Model III or new BMW 7-series. As you can… Read more
May 16, 2016 | Edvard
Power Measurement On Four-Wire System Using Wattmeter Methods
A four-wire system is suitable to supply unbalanced, three-phase loads or single phase loads distributed on all three phases of a low voltage installation. When measuring power on a three-phase… Read more
Apr 06, 2016 | Edvard
Guidelines To Metering Challenges and How To Overcome Them
In the course of any metering exercise, there will be challenges that arise – these may occur in planning, specifying, purchasing, installing, or in the maintaining of the metering system. This… Read more
Mar 19, 2016 | Edvard
Measurement of residual currents on a distribution feeder
The measurement of the earth fault or residual currents on a distribution system feeder can be done by the so-called summation connection, where the three current transformers, one in every… Read more
Jan 22, 2016 | Edvard
