T Group - analogue samples (22)

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The T group Logical Nodes defined in IEC 61850 7-4 provide the instantaneous Sampled Value of analogue quantities covering a wide range of analogue quantities as listed below.  These LN use the SV Common Data Class defined in IEC 61850 7-3.
The application will determine whether these Sampled Values are taken once per year/month/week/day/hour/minute/second or even shorter.
These are typically going to be transmitted using Publisher/Subscriber as defined in IEC 61850-9-2

In the case of current and voltage typically associated with the CT and VT instrument transformers, we have the well known TCTR and TVTR with the specific application defined in the UCAIUG Guideline IEC 61850 9-2LE with either 80 or 256 samples per 50 Hz or 60Hz cycle. 

If some 'processing' of the analogue samples is needed to create derived measurements such as r.m.s values or positive/negative/zero sequence components, these are provided in the M group, but these are therefore not sampled values, but rather MV Common Data Class defined in IEC 61850 7-3.

These can be combined with S group, H group, and P group for a variety of applications in any automation, control or SCADA application - e.g. water industries, gas industries, general industrial processes etc.


Logical NodeAnalogue value
1

TANG

Angle

2

TAXD

Axial displacement

3

TCTR

Current transformer

4

TDST

Distance

5TECWMeasurement of electrical conductivity in water.
6

TFLW

Liquid flow

7

TFRQ

Frequency

8

TGSN

Generic sensor

9

THUM

Humidity

10

TLEV

Level sensor

11

TLVL

Media level

12

TMGF

Magnetic field

13

TMVM

Movement sensor

14

TPOS

Position indicator

15

TPRS

Pressure sensor

16

TRTN

Rotation transmitter

17

TSND

Sound pressure sensor

18

TTMP

Temperature sensor

19

TTNS

Mechanical tension / stress

20

TVBR

Vibration sensor

21

TVTR

Voltage transformer

22

TWPH

Water acidity


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