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# Category: Glossary

## Environmental Conditions

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 this temperature range) | -25 °C … 60 °C |

Max. relative humidity | ≤ 85 %, not condensate |

The environment should be dust free.

share by QR code## Instantaneous Voltage

Phase voltage is measured and presented in corresponded DLMS/COSEM objects for each phase separately. Internally voltages are always measured in mV.

Instantaneous voltage is measured in the meter every second.

OBIS codes | L1 | L2 | L3 |
---|---|---|---|

Instantaneous voltage | 32.7.0 | 52.7.0 | 72.7.0 |

## Watt

A unit of power equal to one joule of energy per second. Dimension letter is **W**

For DC sources we calculate the energy by multiplication of voltage with current.

For AC sources we multiply additional with the power factor to get watts.

Some multiplication factors for watt:

10^{3} W = kilowatt, kW

10^{6} W = megawatt, MW

10^{9} W = gigawatt, GW

10^{12} W = terrawatt, TW

## Instantaneous Power

### Instantaneous power

The measurement micro-controller sends the measured values approximately every 100 ms. Each instantaneous power value is available per phase and sum over all phases. All phase instantaneous power values can be calculated by vector or arithmetic method. Not all CLOU meters have this functionality.

OBIS codes | L1 | L2 | L3 | Sum |
---|---|---|---|---|

A+ | 21.7.0 | 41.7.0 | 61.7.0 | 1.7.0 |

A- | 22.7.0 | 42.7.0 | 62.7.0 | 2.7.0 |

Q+ | 23.7.0 | 43.7.0 | 63.7.0 | 3.7.0 |

Q- | 24.7.0 | 44.7.0 | 64.7.0 | 4.7.0 |

Q1 | 25.7.0 | 45.7.0 | 65.7.0 | 5.7.0 |

Q2 | 26.7.0 | 46.7.0 | 66.7.0 | 6.7.0 |

Q3 | 27.7.0 | 47.7.0 | 67.7.0 | 7.7.0 |

Q4 | 28.7.0 | 48.7.0 | 68.7.0 | 8.7.0 |

S+ | 29.7.0 | 49.7.0 | 69.7.0 | 9.7.0 |

S- | 30.7.0 | 50.7.0 | 70.7.0 | 10.7.0 |

ABS = |A+|+ |A-| | 35.7.0 | 55.7.0 | 75.7.0 | 15.7.0 |

NET = |A+|- |A-| | 36.7.0 | 56.7.0 | 76.7.0 | 16.7.0 |

## How to connect the RS350 to different meter types?

This is only a short reference for most common meters. Make sure that you have read the RS350 operation manual with more examples.

Always follow your company safety guidelines. In addition it’s no mistake to take a look at our safety regulations.

## Short Time Overcurrent

IEC 62052-11, #7.2

Short-time overcurrent test shall not damage the meter. The meter shall perform correctly when back to its initial working condition.

**Conditions for direct connected meters:**

Test current: 30 Imax, duration one half cycle at nominal frequency

**Conditions for meters connected trough current transformers:**

Test current: 20 Imax, duration 0.5 s

## Wiring Diagrams

### 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 sticker. This sticker corresponds with the electrically and pneumatically diagrams. The same identifier is also used in service- and operation manuals.

CLOU is using sub-group identifiers. Each component has a unique identifier. Structure of naming:

– (prefix for components)

– letter for main class

– letter for sub-class

– incrementing number

A small vertical line at the end of a conductor indicates that the line will continue. The continuity of the line is referenced with page no + / + row + column

Example: 5/ A2 links to page 5, row A, column 2

color | code |
---|---|

black | BK |

brown | BN |

red | RD |

orange | OG |

yellow | YE |

green | GN |

blue | BU |

violett | VT |

grey | GY |

white | WH |

pink | PK |

green-yellow | GNYE |

## Relative Error of Indication

Indication minus reference quantity value, divided by the reference quantity value

*Note: The relative error is usually expressed as a percentage of the reference quantity value.*

*In CLOU teminology the short form “error” is used for relative error.*

**Formula**

## Active Power

rate at which energy is transported

*Note: In an electrical system active power is measured as the time mean of the instantaneous power, which is calculated at each instant as the product of voltage and current*

*At sinusoidal conditions active power is the product of the r.m.s. values of current and voltage and the cosine of the phase angle between them, calculated for each phase. It is usually expressed in kW. *