8.4 FPI/DSU classification through performance/capabilities classes
8.4.6 Complete FPI/DSU classification through performance/capability
Table 6 also gives indications for correct use of different FPI/DSU classes (with reference only to fault detection capabilities).
All FPIs/DSUs shall be tested in such a way as to be classified according to Table 6 concerning fault detection capability and algorithms (8.4.2), communication capabilities (8.4.3), and power supply (8.4.4).
In addition, tests may also assess FPI/DSU compliance with optional additional features, as defined by the classification level (see 8.4.5).
Conformance tests and procedures will be described in a future International Standard (IEC 62689-4).
The choice of an FPI/DSU taking into account the classification regarding communication, instead, depends on the distribution network owner's mode of operation (simple local indication of fault location on the network, remotely transmitted indication of fault location, both for manual intervention from personnel in field and for remotely controlled operations on switches/circuit breakers along the feeders, MV network automation with fault clearing and automatic supply restoration, etc.)
62689-1:2016 © IEC 2016 – 37 – Table 6 – FPIs usage classes: fault detection capabilities and communication capabilities
Fault detection capability Additional functions not strictly
related to fault detection Communication capability Power supply
Class Fault detection
features Typical usage Level Class Typical usage Class
F1 Overcurrents, non-directional
IEC 62689-2:
Current and voltage sensors or detectors, to be
used for fault passage indication purposes – Part 2:
System aspects
1 none T1
no intra-/extra- substation communication directly managed
from FPI
– local indications only (flags, lamps, LEDs, colour variations,
etc.). P1 Self-powered
F2 Phase to earth faults, non-
directional
IEC 62689-2:
Current and voltage sensors or detectors, to be
used for fault passage indication purposes – Part 2:
System aspects 2
i. Report on device health (FPI/DSU internal status and alarms):
a. internal fault;
b. lack of auxiliary source;
c. auxiliary controls;
d. others.
ii. Monitoring substation environment (environmental measurements, alarms, etc.)
T2
no extra-substation communication directly managed
from FPI
– local indications (flags, lamps, etc.);
– communication with SCADA through other apparatus (RTUs + modems, RTUs + routers, etc.) connected to FPI (intra- substation communication hard- wired or others)
P2 Internal power supply
– 38 –IEC 62689-1:2016 © IEC 2016
Fault detection capability Additional functions not strictly
related to fault detection Communication capability Power supply
Class Fault detection
features Typical usage Level Class Typical usage Class
F3
Overcurrents, directional, non- phase to earth
faults, non- directional
IEC 62689-2:
Current and voltage sensors or detectors, to be
used for fault passage indication purposes – Part 2:
System aspects 3
i. Report on device health (FPI/DSU internal status and alarms):
a. internal fault;
b. lack of auxiliary source c. auxiliary controls d. others.
ii. Monitoring substation environment (environmental measurements, alarms, etc.) iii. Power flow monitoring (voltage and current measurements for operation purposes)
iv. Monitoring of external communication
T3 Communication FPIs-SCADA (client-server)
Direct communication (bi- directional) only with SCADA (IEC 60870-5-1 01 , IEC 60870-5-
1 04, DNP3, etc).
P3
External power supply
with/without backup capability
62689-1:2016 © IEC 2016 – 39 –
Fault detection capability Additional functions not strictly
related to fault detection Communication capability Power supply
Class Fault detection
features Typical usage Level Class Typical usage Class
F4 Overcurrents, directional and non-directional
IEC 62689-2:
Current and voltage sensors or detectors, to be
used for fault passage indication purposes – Part 2:
System aspects 4
i. Report on device health (FPI/DSU internal status and alarms):
a. internal fault;
b. lack of auxiliary source;
c. auxiliary controls;
d. others.
ii. Monitoring substation environment (environmental measurements, alarms, etc.) iii. Power flow monitoring (voltage and current measurements for operation purposes)
iv. Monitoring of external communication
v. Embedded algorithms for FDIR (FLISR)
vi. Automatic VVC vii. DER management
T4
Communication FPIs-SCADA (client-server) and
peer to peer communication
Direct communication (bi- directional) both with SCADA and
among all IEDs (IEC 61 850). P4 Combination of P1 , P2 and
P3
F5
Overcurrents, directional, non- phase to earth
faults, directional and non-directional
IEC 62689-2:
Current and voltage sensors or detectors, to be
used for fault passage indication purposes – Part 2:
System aspects
– 40 –IEC 62689-1:2016 © IEC 2016
Fault detection capability Additional functions not strictly
related to fault detection Communication capability Power supply
Class Fault detection
features Typical usage Level Class Typical usage Class
F6 Overcurrents and phase to earth faults, directional and non-directional
IEC 62689-2:
Current and voltage sensors or detectors, to be
used for fault passage indication
purposes. Part 2:
System aspects
NOTE 1 Cells with grey background refer only to DSUs, other cells may refer both to FPIs and DSUs.
NOTE 2 FPI/DSU accuracy concerning fault detection means the overall FPI/DSU accuracy (sensors and electronics).
NOTE 3 Values in the cells are independent. The only exception is T1 classified FPIs, which may be associated only with Level 1 .