Metrological checks

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Metrological checks

Transformers for measurement (current and voltage) to be used in combination with electricity meters to measure electricity must meet both metrological and technical requirements imposed by the Legal Metrology Standards (NML)

The metrology laboratory is authorized by BRML and performs metrological verification works for the following measuring means:

Low voltage

  • Current transformer for measurement - currents ≤ 100 A, class 0.2; 0,2S; 0.5; 0.5S or 1
  • Current transformer for measurement - currents between 100 - 4000 A, class 0.2; 0,2S; 0.5; 0.5S or 1
  • Voltage transformer for measurement - voltages up to 0.5 kV, class 0.2; 0.5 or 1
  • Voltage transformer for measurement - voltages between 0.5 kV - 24 kV, class 0.2; 0.5 or 1

Medium tension

  • Current transformer for measurement - currents ≤ 100 A, class 0.2; 0,2S; 0.5; 0.5S or 1
  • Current transformer for measurement - primary currents between 100 A and 4000 A, class 0.2; 0,2S; 0.5; 0.5S or 1
  • Voltage transformer for measurement - voltages up to 0.5 kV, class 0.2; 0.5 or 1
  • Voltage transformer for measurement - voltages between 0.5 kV - 24 kV, class 0.2; 0.5 or 1

Metrological checks are required only for measuring, current and voltage transformers which are intended to be used in conjunction with electricity meters.

Following the verification of the transformers in a BRML authorized laboratory, a Metrological Verification Bulletin is issued confirming the fact that the verified equipment complies with the regulations imposed by NML.

IMPORTANT:

All measuring transformers for which metrological verification is required MUST to have MODEL APPROVAL valid.

 

Accuracy classes of current transformers for measurement (according to IEC 61869-2 / NML).

Accuracy classRatio error, in percent, for current values expressed as a percentage of the rated currentAngle error, in minutes, for current values expressed as a percentage of the rated current
1%5%20%100%120%1%5%20%100%120%
0,1 ± 0,40± 0,20± 0,10± 0,10 ± 15± 8± 5± 5
0,2 S± 0,75± 0,35± 0,20± 0,20± 0,20± 30± 15± 10± 10± 10
0,2 ± 0,75± 0,35± 0,20± 0,20 ± 30± 15± 10± 10
0,5 S± 1,50± 0,75± 0,50± 0,50± 0,50± 90± 45± 30± 30± 30
0,5 ± 1,50± 0,75± 0,50± 0,50 ± 90± 45± 30± 30
1 ± 3,00± 1,50± 1,00± 1,00 ± 180± 90± 60± 60

 

Accuracy classes of voltage transformers for measurement (according to IEC 61869-3 / NML).

Accuracy classRatio error, in percent, for voltage values expressed as a percentage of the rated voltageAngle error, in minutes, for voltage values expressed as a percentage of the rated voltage
80%100%120%80%100%120%
0,1± 0,10± 0,10± 0,10± 5± 5± 5
0,2± 0,20± 0,20± 0,20± 10± 10± 10
0,5± 0,50± 0,50± 0,50± 20± 20± 20
1± 1,00± 1,00± 1,00± 40± 40± 40

 

 

Measuring transformers intended for use only in protection or signaling circuits, automation, command or control installations are NOT subject to metrologisation.

The buyer assumes all costs and risks during the transport process of the products to be checked and those checked.

Efficient packaging of industrial products and goods is almost as important as the packaged item. The packaging protects and preserves the product, facilitates handling and storage and, last but not least, facilitates identification. These functions are vital both for the product to reach the best conditions in front of the end user, but also for its efficient management from the moment it leaves the production line and goes through the necessary steps until its own use phase. -zisă.

 

Each product has customized features and needs, and the packaging solution must be based on the specific characteristics of the packaged item at all stages of its journey from the production line to the cycle of use. A reliable packaging must have a set of general characteristics, on request others can be added depending on the object it packs. Thus, the main characteristics of dedicated packaging for industrial products are:

 

Sting resistance and robust enough to withstand high pressures. The latter feature is essential, especially in the storage phase when the packaging will have to withstand the prolonged pressure of similar cardboard boxes to be stored on top.

Anti-shock role: the packaging must be able to cushion the impact on the product if it is subjected to an accidental mechanical shock.

Insulation: depending on the characteristics of the product, the packaging must prevent the ingress of moisture and, in some cases, even air.

Sealing: it is important that the packaging has a system to prevent premature opening. It is either provided with a barrier that does not allow access inside the box, or it is sealed so that a possible opening can be identified before delivery to the end user.

Firstly, the purpose of the appropriate packaging is to ensure that the product is transported in accordance with the manufacturer's instructions. In addition, it is a guarantee to the end user that the product has not suffered an alteration of its qualities on the way from the manufacturer.

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Informații disponibile la cerere

Informații disponibile la cerere