CARLO GAVAZZI WM23-96 - PROGRAMMING Manuál s instrukcemi stáhnout pdf (Strana 34)

Electrical phenomena

If we briefly go back to the

characteristics of electric voltage in

the origin of the installation and in

order to closely examine this matter,

the Regulation divides these features

into two groups;

The first one for which some

quantitative information are supplied:

• Frequency

• Harmonic distortion

• Phase Asymmetry

The second one for which a few

approximate data are supplied:

• Quick voltage variations

• Voltage dips

• Supply interruptions

• Overvoltages

All these variables have a direct

consequence on the service quality,

but also on lines and loads.

The problems

The solution

The direct consequences of these phenomena on lines and

loads can be underlined as follows:

• Failures on compensation capacitors

• Blowing of capacitor fuses

• Overheating of power supply transformers with load cur-

rent below the rated value

• Overheating of motors and frequent failures

• High neutral conductor currents

• Problems on electronic motor controls

• Frequent activation of UPS.

In this case the solution to the monitoring of these electric

variables can have two different proposals depending on the

application needs:

• The first one refers to the occasional analysis and

monitoring of the lines and of some critical charges by

means of the right instrument, such as PQA700.

This analyzer represents therefore the solution according

to what is required by EN50160.

• The second and more complete proposal refers to the

continuous monitoring and to the automatic recording of

various conditions; these are due either to basic

phenomena such as the harmonic contents of currents

and voltages or to the measurements connected to

consumption (current, power, energy, etc.). The latter can

be taken with a flush-mounting instrument, like WM3-96,

and can be followed by the subsequent research and

location of the anomalies by means of a proper measuring

and analysis instrument such as PQA700.

The Main Menu

The selection menu of the measuring functions is

immediately available by means of a keypad command

and allows the operator to:

• Display the instantaneous measurements

• Display the energies

• Enable the oscilloscope function

• Enable the harmonic analysis

• Enable the recording of supply voltage dips

• Enable the MIN / AVG/ MAX recording

• Set the clock

• Program the basic parameters of the instrument

How to order PQA700

PQA70[Clamp type: 2= CA1002, 3X= Flex 3000Q]

[Language: I, E, F, D, UK][Power Supply: 115V, 230V]

See next page: “Accessories”.

e.g.: PQA702 UK 230V

PQA702 D 230V

PQA703X UK 115V

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