Technical literature The QualistarPlus models and the IEC 61000-4-30 standard

The latest models in the QualistarPlus range of three-phase network and power analysers draw on the experience gained with their predecessors and offer further improvements. We can now state unambiguously that the Qualistar Plus C.A 8336-33 (PowerPad III AEMC 8336-33) models comply with Class B as defined in the IEC 61000-4-30 standard when the instruments are used with the Power Analyzer Transfer 2 processing software.

Reminders "The present standard provides appropriate measurement methods and

performance requirements without setting thresholds."

In edition 2 of the IEC 61000-4-30, the following power-supply quality parameters are taken into account:

Industrial frequency Amplitude of the power-supply voltage Flicker Temporary power-supply voltage dips and surges Power outages Transient voltages Power-supply voltage unbalance Voltage harmonics Voltage interharmonics Signals transmitted on the power-supply voltage Rapid voltage variations.

It is specified that a measuring instrument can measure all or some of the parameters identified in the present standard and preferably uses the same class for all the parameters. The instrument manufacturer should declare which parameters are measured, which class is used for each of the parameters, the Udin range for which each of the classes is fulfilled, and all the necessary requirements, as well as the accessories (synchronization, sensors, calibration time, temperature ranges, etc.) to comply with each of the classes.

The IEC 61000-4-30 standard specifies 3 instrument classes: "A" for "Advanced" "S" for "Surveys" "B" for "Basic.

The results from the tests carried out with the new QualistarPlus models were satisfactory. This means that we can state that, according to all these parameters, the C.A 8336 and C.A 8333 offer Class B measurements.

C.A 8336 C.A 8333

Power & Energy Quality Analysers

Measurement methods that comply with the standards

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The methods and accuracies specified for Class B will therefore be compared with those of the C.A 8336 and C.A 8333, their v4.0 firmware and their Power Analyzer Transfer 2 processing software.

The declared input voltage (Udin) is "the value obtained from the declared power-supply voltage (Uc) of a transformation ratio. "

Compliance of the C.A 8336 and C.A 8333 With their Power Analyzer Transfer 2 processing software, the C.A 8336 and C.A 8333 comply with Class B of edition 2 of the IEC 61000-4-30 standard for the following parameters:

Industrial frequency Amplitude of the power-supply voltage Flicker Power-supply voltage dips Temporary overvoltages at the industrial frequency Power-supply outages Transient voltages Power-supply voltage unbalance Voltage harmonics

Note: To ensure compliance, the trend recordings must be performed with: A recording period of one second The Vrms and Urms quantities selected The V-h01 and U-h01 quantities selected

Uncertainties and measurement ranges

Parameter Range Uncertainty Udin Industrial frequency [42.5 Hz ; 69 Hz] 10 mHz [50 V ; 1,000 V] Amplitude of the power-supply voltage [50 V ; 1,000 V] 1 % of Udin [50 V ; 1,000 V] Flicker [0.25 ; 12] See User's Guide V {120 V ; 230 V} U {230 V ; 400 V}

Residual voltage [2 V ; 1,000 V] 2 % of Udin Power-supply voltage dips Duration [10 ms ; 65,535 days] 80 ppm 10 ms (max.) 30 ppm 10 ms (typical)

[100 V ; 1,000 V]

Maximum amplitude [2 V ; 1,000 V] 2 % of Udin Temporary overvoltages at the industrial frequency Duration [10 ms ; 65,535 days] 80 ppm 10 ms (max.) 30 ppm 10 ms (typical)

[100 V ; 1,000 V]

Power-supply voltage outages Duration [10 ms ; 65,535 days]

80 ppm 10 ms (max.) 30 ppm 10 ms (typical) [100 V ; 1,000 V]

Power-supply voltage unbalance [0 % ; 10 %] 0.3 % (i.e. 3 cts) [50 V ; 1,000 V] Level [0 % ; 1,500 %] (2.5 % + 5 cts)

Voltage harmonics Voltage [2 V ; 1,000 V] (2.5 % + 1 V)

[50 V ; 1,000 V]

Uncertainty of the real-time clock The maximum uncertainty of the real-time clock is 79.26 ppm (3-year-old instrument used at 50 C ambient temperature).

Calculation requirement for aggregation For aggregations of recordings (Trend mode),the recording period programmed in the C.A 8336 and C.A 8333 must be equal to 1 second so that the Power Analyzer Transfer 2 software can then make aggregations of these "1-second" values while respecting the calculation requirement of the root mean square.

Polyphase management of voltage dips, surges and outages The Power Analyzer Transfer 2 processing software performs post-processing for connection of the threshold overrun results for each channel in order to provide the user with characterizations (evaluation data) of polyphase voltage dips, surges and outages in compliance with the standard. As the C.A 8331 is not equipped with the Alarm mode, it cannot meet this requirement and would therefore be outside the framework of the standard.

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