Single Phase Meter CL710K20

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Accelerated Life Test for Energy Meters

There are several ways to predict the reliability of an energy meter. The IEC provides a series of standards related to reliability tests or evaluations. ...

Ready for the Show

Come, meet us during the European Utility Week in Paris, Expo Porte de Versailles, and discuss with our experts about all aspects of smart-metering and AMI.
Our booth no. is N20. ...

How does Net metering work?

When you are generating power by solar or wind, you might produce more energy than you actually need. ...

Is there a Lifetime Calibration?

Electronic energy meters are adjusted for life-time. A recalibration has to be done by country rules and regulations. ...

What will be the recorded demand?

What will be the recorded demand if a constant load of 1 kW is applied through a 30 minute demand meter ? ...

How to get a Clear Tamper Token?

A clear tamper token is required to unlock a STS meter showing the tamper sign. Only the local power company can issue this token code. ...

What is a Load-Switch?

Usually in electricity meters the load switch is a latching relay. A latching relay keeps its contact position indefinitely without power applied to the coil. … Continue reading What is a Load-Switch? → ...

Make the Most of Portable Meter Test

In order to protect the utility revenue it's essential to do regular on-site tests on meter installations. If you are suffering huge losses you should … Continue reading Make the Most of Portable Meter Test → ...

Johannesburg Ransomware Attack

Cyberattacks against critical infrastructure have become common. This time, a ransomware infection has been reported on the systems of City Power, one of South Africa’s leading power … Continue reading Johannesburg Ransomware Attack → ...

Security for Optical Ports on Energy Meters

Optical ports provide local access for service engineers during installation or maintenance of energy meters. Households have physical access to their energy meter and might … Continue reading Security for Optical Ports on Energy Meters → ...

European Accreditation

The European Accreditation Association has per country one member. This members are allowed to approve test laboratories for e.g. calibration according to according to ISO … Continue reading European Accreditation → ...

What is DLMS/COSEM ?

DLMS stands for Device Language Message Specification,a generalised concept for abstract modelling of communication entitiesOfficial website The COmpanion Specification for Energy Meteringsets the rules, based … Continue reading What is DLMS/COSEM ? → ...

Calculation methods for energy

We got several questions related to the different recording methods for electrical energy meters. Here is the behaviour with different settings: Vector registration method (∑L)By … Continue reading Calculation methods for energy → ...

General information for wiring diagrams

Understanding the markings and cross references CLOU follows the DIN EN 81346-2 for marking and identification of components inside of automated test equipment. The hardware … Continue reading General information for wiring diagrams → ...

Environmental Conditions For Meter Test

Laboratory meter test equipment should operate under the following climatic conditions. Item Value Nominal temperature 23 °C ±2 °C Operating temperature range +5 °C  45 °C Limit range for storage … Continue reading Environmental Conditions For Meter Test → ...

Which standard is applicable for acceptance tests for energy meters?

From time to time there are some questions regarding the acceptance inspection for energy meters. This paper is to clarify the legal and metrological matters. … Continue reading Which standard is applicable for acceptance tests for energy meters? → ...

The difference between adjustment and calibration

The term calibration is often misused.Calibration means the comparison of a unit under test (in our case a energy meter or reference standard) with a test equipment … Continue reading The difference between adjustment and calibration → ...

Pulse Calculation for Stationary Test Benches

All energy meters used for billing purpose have a test output for calibration. This can be flashing diode, a pulse output at the terminal or … Continue reading Pulse Calculation for Stationary Test Benches → ...

Terminal wiring for electrical energy meters

Many people are messing up with the energy meter type descriptions. There are two standards for the wiring of bottom-connectedenergy meters. DIN 43857 BS 5685 … Continue reading Terminal wiring for electrical energy meters → ...

How long does a no-load test take?

First we take a look at the IEC standards. The run-time depends on several factors like accuracy class meter constant number of elements Nominal Voltage … Continue reading How long does a no-load test take? → ...

The different current subscripts

Together with tender documents and meter specifications you will find various subscripts related to current. current I without subscriptThis is the actual current flowing trough … Continue reading The different current subscripts → ...

When do I need Isolation Current Transformers?

Isolation Current Transformers (ICT) are needed to test more than one direct connected energy meter on a test bench with multiple positions, assuming that the I-P links can not be opened. ...

The Standard Transfer Specification STS

The Standard Transfer Specification (STS) has become recognised as the only globally accepted open standard for prepayment systems, ensuring inter-operability between system components from different … Continue reading The Standard Transfer Specification STS → ...

The four-quadrant diagram in electricity metering

The interactive diagram below shows the relationship between the phase angle φ, apparent-, active- and reactive power respective energy in accordance with clauses 12 and 14 of IEC 60375. ...

Why do I need a vector diagram?

Modern reference standards and calibration devices have usually a graphical function to show the relationship between the voltages and the currents. Most equipment manufacturers call … Continue reading Why do I need a vector diagram? → ...

What are harmonics ?

Generally a harmonic is a integer multiple of the fundamental frequency (nominal fn). When we have a fn of 50 Hz, the 3rd harmonics is traveling with 150 Hz. We can have harmonics in the voltages and in the currents. ...

Vectorial- and arithmetic VA calculation

There are two commonly used methods to calculate the apparent power (VA).The traditional method is the vectorial calculation. Here we are adding the active power … Continue reading Vectorial- and arithmetic VA calculation → ...

What is Maximum Demand Measurement?

Demand is a measure of average power consumption over a fixed time interval. Maximum (or peak) demand is the highest demand recorded over the billing … Continue reading What is Maximum Demand Measurement? → ...

What is the difference between technical loss and non-technical loss?

Technical losses are coming from current flowing in electrical installations. They can not be avoided, but reduced by proper installation. Technical losses can be calculated. Losses … Continue reading What is the difference between technical loss and non-technical loss? → ...

Personal Safety for electrical installations

It's never a mistake to read the basics again. Avoid contact with energized electrical circuits Treat all electrical devices as if they are live or … Continue reading Personal Safety for electrical installations → ...