# Metering Blog

Here we are publishing answers on your questions related to electrical energy and metering. If you have questions, please use our contact form or write a comment below the related article.
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## 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 manufacturers of prepayment systems.The application of the technology is licensed ...

## 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 ?

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

. 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

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

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. Steve says:

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. LaoRen says:

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.

2. patricia says:

How can someone test reactive energy kvarh in a meter test bench?

1. LaoRen says:

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.

3. patricia says:

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

1. LaoRen says:

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.

4. Aaron says:

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. Vivian Sun says:

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).

Where can I find the operational manual for clou meter, with series number CL710K11

1. LaoRen says:

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. Emerson says:

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. LaoRen says:

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.