ION 7500 / ION 7600 User’s GuideSupply Voltage Unbalance

Supply Voltage Unbalance

Each basic measurement is the true RMS value over a fixed 10-minute period (see the UNIPEDE Measurement Guide for Voltage Characteristic for more details).

Observation period of one week with fixed steps of 10 minutes.

N = number of 10-minute intervals in which the supply voltage is within ±15% of nominal.

N1 = number of intervals in which the voltage unbalance exceeds 2% (3% in some areas) and the supply voltage is within ±15% of nominal.

Voltage unbalance complies with the standard if N1/N <= 5% during the observation period (1 week by default).

Each measurement is the RMS unbalance voltage:

EN 50160 data (current observation period): The meter generates the N and N1 counts as described above. These counters are reset at the beginning of the next observation period.

EN 50160 data (previous observation period): The meter stores the N and N1 counter values at the end of each observation period before these counters are reset. These 2 registers are also stored in a data recorder for each observation period.

Events: A message is created in the Event log every time the N1 counter increases.

Unbalance Default Measurements

Register Label

Module Type

Description

 

 

 

Vubal N*

 

Number of valid intervals (voltage on all phases within +/- 15% of nominal)

 

 

 

Vunbal N invld*

Signal Limit Evaluation

Number of invalid intervals

 

 

 

Vunbal N1*

 

Number of valid intervals in which the voltage unbalance exceeds 2%

 

 

 

PO Vunbal N

 

Vunbal N of the previous Observation Period

 

Store

 

PO Vunbal N1

Vunbal N1 of the previous Observation Period

 

 

 

 

Vunbal mean

Sliding Window Demand

Average voltage unbalance over 10 minutes (used for display purposes)

 

 

 

Vunbl mean mn

Minimum

Minimum average voltage unbalance over 1 week (used for display purposes)

 

 

 

Vunbl mean mx

Maximum

Maximum average voltage unbalance over 1 week (used for display purposes)

 

 

 

Vunbal N1/N

 

N1/N ratio

 

Arithmetic

 

PO Vunbal N1/N

N1/N ratio of the previous Observation Period

 

 

 

 

* This data is recorded once every week by Data Recorder 28.

Power Quality: ION Meters and EN50160 Technical Note

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Multi-Tech Systems 7500 Supply Voltage Unbalance, Unbalance Default Measurements, Register Label Module Type Description
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