Block

Mask

Description

The OpIEC61850SVSubscriber block represents of subscribing to a multi-cast SV message published by an external IED like a merging unit. This block can represent every IED in the bus process that is capable of subscribing to a multi-cast SV message; examples of these IED could be Bay Controllers or Protection Relays.

This version of SV Subscriber follows the recommendations of the UCA International Users Group, published in the user convention IEC 61850-9-2LE (See the documentation Implementation_Guideline_for_Digital_Interface_IEC_61850). Mainly, the SV data set is composed of 4 CT/VT transmitted using 80 or 256 samples per cycle.

The block output data does not receive any sort of treatment, it just outputs the raw values received on SV messages.

Parameters

Ethernet Adapter

Specifies the name of the Ethernet adapter interface (string, 64 characters max.).

To verify which ethernet devices are available on a RedHat system, issue the following command:

# ifconfig

A list of available network interfaces is printed. Report in this field, the name of the network interface to be used by this merging unit.

LDName

Specifies the system-wide unique identifier (string, 10 characters min., 35 characters max.). The user convention IEC 61850-9-2LE recommends using the following format ‘xxxxMUnn’ where xxxx is the concatenation of the substation name, voltage level and bay and where nn identifies the measuring point.

MAC Address

Specifies the MAC multicast destination address where the sampled values are published (e.g. '01-0C-CD-04-00-00'). The MAC address must respect the following format 'hh-hh-hh-hh-hh-hh', where h is an hexadecimal digit.

Inputs

Stop input is a flag enabling the reception of sampled values per nominal line cycle:

1: disabled

0: enabled.

Outputs

TimeStamp is an output that provides the time when each SV message was captured. This is an increasing count in micro-seconds provided by the ethernet card.

Four-element output vectors V, I produce the reconstructed signal from the SV messages values to which this block is subscribed to. It does not perform any sort of treatment on the output signal, it just outputs the raw values received on SV messages.

V and I are respectively 3 phase voltages/currents and neutral voltage/current:

[Va, Vb, Vc, Vn] and [Ia, Ib, Ic, In]

QA is a 8-element vector used to output the quality attributes of the voltage/current dataset [QVa, QVb, QVc, QVn, QIa, QIb,QIc,QIn]. Each element represents a 16-bit value. The signification of each bit is described in the following array:

Bit	Attribute Name	Attribute Value	Value	Default Value
0-1	Validity	Good	0 0	0 0
		Invalid	0 1
		Reserved	1 0
		Questionable	1 1
2	Overflow		TRUE	FALSE
3	Out of range		TRUE	FALSE
4	Bad reference		TRUE	FALSE
5	Oscillatory		TRUE	FALSE
6	Failure		TRUE	FALSE
7	Old data		TRUE	FALSE
8	Inconsistent		TRUE	FALSE
9	Inaccurate		TRUE	FALSE
10	Source	Process	0	0
		Substituted	1
11	Test		TRUE	FALSE
12	Operator blocked		TRUE	FALSE
13	Derived		TRUE	FALSE

This block has one output which is the error status: Err.

It may return the following values:

0	The block completed reception operation successfully.
-1	The driver didn't initialize properly.
-2	The block stop input flag is enabled.
-11	Driver initialization failure
-12	Potential memory corruption
-13	Error during memory allocation
-14	Could not communicate with the interface specified by the Ethernet adapter parameter.

Characteristics and Limitations

SV Subscriber block can only filter messages by multi-cast address (MAC address) only; therefore is it not possible to have two SV messages being published on the same address since SV subscriber block will subscribe to both leading to erroneous information.

Direct Feedthrough	No
Discrete sample time	No
XHP support	Yes
Work offline	No

RT-LAB Documentation

OpIEC61850 SV Subscriber