Metering Blog

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How Mean is the Value?

How Mean is the Value?

CLOU energy meters and test equipment is measuring the true RMS value by waveform sampling. There are other methods, but they are less accurate. ...
Power Grid Stability and Renewable Energy

Power Grid Stability and Renewable Energy

With increasing percentage of renewable energy on power generation we will see more disturbances in the grid. ...
Waveform Sampling for Electrical Measurements

Waveform Sampling for Electrical Measurements

The interactive graphics below shows the impact on sampling rates on different waveforms. The error calculation is based on true-rms for a wave with 360 samples and for training purpose only. ...
The Over- and Under Voltage Disconnection

The Over- and Under Voltage Disconnection

The phase to neutral supply voltage is controlled by the power generation companies and utilities by using transformers with on-load tap changers. Depending on the region you can find different supply voltages. ...
The Over-Current Disconnect Function

The Over-Current Disconnect Function

Electronic meters with build-in relays can serve for various functionalities. By IEC62052-11 Ed.2 the name for this sort of relays is Supply Control Switch (SCS). ...
Who pays for the Beep?

Who pays for the Beep?

Electronic energy meters, especially those with STS payment functions have the ability to give an alarm. Low credit is a typical example. ...
Load Limiting for Energy Meters

Load Limiting for Energy Meters

Electronic energy meters with a build-in load switch can be programmed for a maximum load. If a consumer exceeds the limit, he will be disconnected ...
Selection of Voltage Transformers

Selection of Voltage Transformers

Voltage instrument transformers (VT, sometimes also abbreviated with PT) are used on the primary side of medium- and high voltage distribution transformers. ...
Selection of Current Transformers

Selection of Current Transformers

Transformer operated energy meters need instrument transformers to reduce high voltage- and current values to lower quantities for measurement purpose. ...
Cross-sections for electricity wiring

Cross-sections for electricity wiring

Each conductor wire has a resistance. Resistance means heat development inside the wire. Technically it\'s a loss. ...
Electrical Power Supply Systems

Electrical Power Supply Systems

Usually the power supply systems are named with single phase, three-phase three wire or three-phase four-wire. The German VDE and the IEC60364-1 have unified the supply systems based on grounding. ...
Maximum Current for Energy Meters

Maximum Current for Energy Meters

An energy meter has certain specifications, including maximum current. This is the base for all kind of meter type tests. ...
The TID Clock is ticking

The TID Clock is ticking

If you are using STS prepayment energy meters you might remember that updates are required for the key management centre (KMC), the security modules and the vending software. ...
Markings on the Case of Energy Meters

Markings on the Case of Energy Meters

The IEC 62052-11 Edition 2 has introduced some changes for the meter marking and documentation. Today we cover the mandatory content of the nameplate for IEC meters. ...
Pairing of a User Interface Unit with a Meter

Pairing of a User Interface Unit with a Meter

A user interface unit (UIU) is a remote access terminal for STS prepayment meters. The device is placed inside the users premisses while the energy meter is mounted outside and mostly not direct accessible. ...
Swapping Phase and Neutral

Swapping Phase and Neutral

Will an electronic energy meter measure accurate when I invert phase and neutral during installation? This question came up recently. ...
Ring Wave Immunity Test

Ring Wave Immunity Test

The IEC 62052-11 Ed.2 comes with a lot of changes for meter type testing. Another new introduced test for electromagnetic compatibility (EMC) is the ring wave immunity test. ...
The Uttar Pradesh Smart Meter Shutdown

The Uttar Pradesh Smart Meter Shutdown

A sudden shutdown of 150,000 smart meters happened recently in the Uttar Pradesh province, India. ...
Electrostatic Discharge Test for Energy Meters

Electrostatic Discharge Test for Energy Meters

Sometimes it happens that you touch the door knob and you get an electrical shock. It\'s not dramatically for your body but an unpleasant feeling. ...
Don’t touch anything!

Don’t touch anything!

In your utility laboratory and for your on-site workers you take of course care for a proper training on the job and especially for personal safety. ...
The Stability of IEC Standards

The Stability of IEC Standards

Meter manufacturers, utility laboratories and type testing institutes have planning security until year 2025. ...
The Critical Change Value

The Critical Change Value

The critical change value indicates the maximum amount of change allowed in the meter’s energy registers during disturbance tests without any current flowing in the meter’s current circuits. ...
The Optical Test Output and Pulses

The Optical Test Output and Pulses

Each electronic energy meter must have at least one optical test output. Commonly its named with flashing pulse diode or similar. ...
Test Bench Stability of the Output Settings

Test Bench Stability of the Output Settings

In customer requests and tenders you can still find extensive requirements for the stability of the output settings. ...
Where is the Basic Current?

Where is the Basic Current?

In the last 100 years we had a lovely Ib for direct connected meters. Now the name has changed to nominal current In. ...
The Initial Start-Up for Energy Meters

The Initial Start-Up for Energy Meters

Electronic energy meters are like small computers. The need some time for starting up. ...
Influence of Fast Load Current Variations

Influence of Fast Load Current Variations

The load current can vary frequently with high amplitude. The test conditions in the older versions of the IEC62052-11 have all be static... ...
Repeatability Test for Energy Meters

Repeatability Test for Energy Meters

Another new test introduced by the IEC62052-11 Edition 2 is the repeatability test. ...
Influence of Self Heating

Influence of Self Heating

We need to figure out whether the occurring internal heat is causing a temporary error drift above the allowed limits for variation. ...
No Load Test for Energy Meters 2020

No Load Test for Energy Meters 2020

With publishing of the Edition 2 of IEC62052-11 the minimum run time calculation formula has changed. ...
Odd Harmonics in the Current Circuit

Odd Harmonics in the Current Circuit

The edition 2 of the IEC62052-11 has introduced two additional tests for odd harmonics. ...
Which Meter Constant should a Meter have?

Which Meter Constant should a Meter have?

Higher constant means faster testing. The most time-savings are coming from the no-load test and the starting test. ...
The Energy Meter Register Resolution

The Energy Meter Register Resolution

The main purpose of an electronic energy meter is the accurate metering of the customer consumption. The meter has registers for storing the various consumption values ...
Short Interruption and Dip Tests IEC62052-11

Short Interruption and Dip Tests IEC62052-11

The International Electrotechnical Commission (IEC) has released the edition 2 of the IEC62052-11. ...
The Energy Meter Tamper Event Log

The Energy Meter Tamper Event Log

This segment of the event logs is capturing all possible meter manipulations and abnormal environmental conditions. ...
The Energy Meter Standard Event Log

The Energy Meter Standard Event Log

All extraordinary things happen inside or close to an electronic meter are called \"events\". An event has at least one time record (date & time of occurrence). Some events can also have an end-time stamp. ...
Meter housings and fixed dimensions

Meter housings and fixed dimensions

Recently I stumble over a request for a fixed size of meter enclosures. Tolerances have also been given with +/- 2 mm, together with features like auxiliary circuits and exchangeable communication modules. ...
Our outstanding customer support

Our outstanding customer support

With all the challenges we face during the COVID-19 pandemic, one thing always remains the same. We have an excellent customer support. ...
Voltage Fluctuation and Flicker

Voltage Fluctuation and Flicker

Recently the question came up: \"Can your energy meters measure flicker?\" Before we answer this, let\'s take a look on the causes and effects of flicker. ...
What are your priorities?

What are your priorities?

By definition the Head End System collects the data from the smart meters. It’s the simplest function of an AMI system. ...
What is Load Shedding and How to Overcome?

What is Load Shedding and How to Overcome?

Electrical energy utilities are using the load shedding method to reduce the demand and balance it versus the energy generation. ...
See You In Milan

See You In Milan

You as frequent visitor of the annual Metering Event might remember the last years announcement in Paris. ...
Ingress Protection against Water and Dust

Ingress Protection against Water and Dust

In many regions of the world the energy meters are installed outdoor. They are exposed to various climatic- and weather conditions. ...
Tampering of Electric Energy Meters

Tampering of Electric Energy Meters

For revenue protection each utility or power company is doing a dedicated loss statistic. The loss due to meter tamper is part of it. ...
Face Recognition System CL2055

Face Recognition System CL2055

The face recognition system CL2055 has an integrated temperature scanner. It is suitable where ever entrance control with body temperature measurement is needed. ...
User Interface Unit UIU

User Interface Unit UIU

The user interface unit (UIU) is a device for remote access to STS payment meters. ...
Negative Phase Current

Negative Phase Current

Electronic energy meters can have various additional useful functions for tamper protection, event logging or billing. ...
Efficiency on Wednesdays

Efficiency on Wednesdays

Our management has instructed the R&D department to come out with an automated solution. We are CLOU, so the product was finished in 20 days. ...
Preventive Measures for Virus Control

Preventive Measures for Virus Control

As you maybe already know the New Year started not as expected. Cases of a contagious coronavirus have increased dramatically over the past weeks. ...
What is Measurement Uncertainty?

What is Measurement Uncertainty?

When we do high precision measurements we have to make sure that we are getting the measurement results as accurate as possible. ...
Wrong Phase Sequence

Wrong Phase Sequence

The measurement circuit of CLOU three-phase energy meters constantly monitors transition through zero on all phase voltages. ...
Welcome to the Year of the Rat 2020

Welcome to the Year of the Rat 2020

As usual our company has rented the Shenzhen sports stadium for the annual Spring Festival Gala and Outstanding Staff Award Ceremony. ...
What are Transient Voltages?

What are Transient Voltages?

Transient voltages are short time peaks in the a.c. power supply. They typically last a few milliseconds and the voltage can reach several thousand volt. A transient is by definition shorter than half cycle. ...
What is a Voltage Swell Event?

What is a Voltage Swell Event?

A voltage swell is a surge (increase) of voltage above 110 % of the rms magnitude in your power grid. The duration can be between ½ cycle and one minute. (EN 50160) ...
What is a Voltage Dip Event?

What is a Voltage Dip Event?

Sometimes it\'s also referred to voltage sag (IEEE term). The meaning is the same. This article explains the power quality event logging inside of smart meters. ...
The First Breath Notification

The First Breath Notification

The First Breath Push notification is sent to the head end system (HES) as soon as the meter is powered up. ...
The DLMS Push Message

The DLMS Push Message

A electronic energy meter with communication via DLMS can be configured to send Push messages. Usually a meter acts as a server. ...
The Last Gasp Outage Notification

The Last Gasp Outage Notification

Smart meters can generate a Push message in case of power fail. This event is called Last Gasp. ...
Practical Use of Load Profiles

Practical Use of Load Profiles

Electronic energy meters can save internally a lot of data. When this data are saved periodically with time stamp, we talk about a load profile. ...
The TOU Tariff Structure

The TOU Tariff Structure

TOU stands for time of use. It\'s getting popular together with smart energy meters and advanced metering infrastructure (AMI). ...
Energy Meters and Tariffs

Energy Meters and Tariffs

Electronic energy meters are recording the actual power over a certain time. The microprocessor inside of these meters allows all kind of additional calculations. ...
Sealing of Energy Meters

Sealing of Energy Meters

Electrical Energy meters are sealed to detect possible manipulations. The utility field workers check the meter installations regular. ...
Sealing of Optical Ports

Sealing of Optical Ports

The optical port is for local communication with energy meters. With suitable software and an optical reading head you can access to the meter for reading and writing certain parameters. ...
Principle for Accuracy Testing of Energy Meters

Principle for Accuracy Testing of Energy Meters

Now meter testing is much more comfortable. Actually you only need to put the meters on the rack. For testing big quantities of meters a robot can also do the job. But what happens inside? ...
Basics of Energy Meter Accuracy Tests

Basics of Energy Meter Accuracy Tests

In the past without any electronics a accuracy test was really challenging. You needed a voltage/current source with a high stability, calibrated wattmeters and a calibrated stop-watch. ...
How does a scanning head work?

How does a scanning head work?

Each energy meter used for billing must have a test output. An optical indication is mandatory. Beside this the meter can also have electrical test outputs. ...
The Three-phase Generator Principle

The Three-phase Generator Principle

We have a nice three phase power supply in our home, but where does it come from? And why does the waveform has a sine shape? ...
Accelerated Life Test for Energy Meters

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. ...
How does Net metering work?

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?

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?

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?

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?

Note: since IEC62052-11 Ed.2 the name for the internal relay is supply control switch (SCS).Usually in electricity meters the load switch is a latching relay. A latching relay keeps its contact position indefinitely without power ...
Make the Most of Portable Meter Test

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 focus on transformer operated meters first. Those meter installations can ...

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 suppliers, specifically in the capital, Johannesburg. The incident left thousands ...
Security for Optical Ports on Energy Meters

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 try to get access to the meter software. ...
European Accreditation

European Accreditation

The European Accreditation Association has per country one member. This members are allowed to approve test laboratories for calibration. ...

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 on existing standards, for data exchange with energy meters, used ...
Calculation methods for energy

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 vector method the vectors of each phase L1, L2 and ...

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 of each component is clearly marked with a yellow identification ...

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 and transport   (max. 6 h at the extremes of ...
Acceptance tests for energy meters

Acceptance tests for energy meters

From time to time there are some questions regarding the acceptance inspection (FAT) for energy meters. This paper is to clarify the legal and metrological matters. ...
The difference between adjustment and calibration

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 with higher accuracy. It is a strict comparison to evaluate ...
Pulse Calculation for Stationary Test Benches

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 the mark of a rotating disk. This test output gives ...

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 In meter- or test bench descriptions you can find various ...
How long does a no-load test take?

How long does a no-load test take?

When the voltage is applied with no current flowing in the current circuit, the test output of the meter shall not produce more than one pulse. ...
The different current subscripts

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 the energy meter. starting current IstThis is the lowest value ...
When do I need Isolation Current Transformers?

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

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 manufacturers of prepayment systems.The application of the technology is licensed ...
The four-quadrant diagram in electricity metering

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 this function vector diagram or vectorial diagram.In fact it is ...
What are harmonics ?

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 ...
Vectorial- and arithmetic VA calculation

Vectorial- and arithmetic VA calculation

. There are two commonly used methods to calculate the apparent power (VA). The traditional method is the vectorial 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 period. The billing period is mostly end of the month. ...
The difference between technical loss and non-technical loss

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. ...
Personal Safety for electrical installations

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 energized Disconnect the power source before servicing or repairing electrical ...

12 Replies to “Metering Blog”

  1. I have a clou meter token and am just wondering how i can silence the beeping alarm that goes off when your are low on tokens. Its kinda annoying. Ypur help will be highly appreciated.
    Regards,
    Steve

    1. Steve, try code 812 on your UIU (user interface unit) and confirm by pressing the enter-button (blue or red). If it doesn’t work, please tell us the meter model type.

    1. If the energy meter has a function for measuring reactive energy, it must have a test output (a flashing diode) indicating the reactive consumption. This test output has a meter constant, indicated in e.g. pulses per kvarh. You set measurement mode in your test plan to reactive measurement and adjust the scanning heads in front of the reactive diode. All other procedure is the same like active accuracy test. The settings for reactive power is done inside the test bench and reference standard automatically.

  2. which is the standard to be used for testing of for Reactive power in energy meter and what are the acceptable error margins?

    1. The IEC 62053-23 is applicable for static meters for reactive energy (classes 2 and 3). The allowed errors for accuracy are given in the related tables. If you have a meter with reactive class 2, the allowed error is +/-2% for all balanced loads above 0.1 Ib and power-factor 1.

  3. My CLOU (CL710K11) just shows zeros when I try to enquire balance or input new token, I think it is not communicating with the power source

    1. The possible reason could be long communicate distance or the power cable quality,plsase use another socket and try again. if still doesn’t work,pls confirm whether the UIU address is right one( enter 1593570 plus the meter number to set the UIU address).

    1. Thank you for your message. The operation manual is for the power company or utility. End users get an introduction by the power company and a reference card with the user interface short codes. The configuration for each power company is different. If you are in doubt about a function, ask your power supplier.

    2. My CL710K11 meter
      Red light is lit next to the word “WIRING” and I noticed low power in house today. Any idea what could be the problem.

      1. It indicates a poor communication between the user interface unit and the meter. One reason behind can be a very low supply voltage from the grid.

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