Specifications

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16.4
Tr a n s f er Switches
Magnum-Based Designs
Protective Relaying
Protective Relay
For paralleling (including
soft loading/unloading)
applications, utility-grade
protective relaying is optional,
and offered when utility
interconnection standard
requires additional protection
on top of that provided by
ATC-5000 controller. The
following protective relays
can be included in Eaton
Soft Load ATS:
●
Beckwith M-3410A—see
Appendix B for details
●
Beckwith M-3520
●
Schweitzer SEL-351
●
Schweitzer SEL-547
●
Basler BE1-951
●
Basler BE1-IPS100
All the previously listed
protective relays provide
protection necessary
to satisfy IEEE P1547
standard “IEEE Standard
for Interconnecting
Distributed Resources
with Electric Power
Systems.” See table below.
Protective Relays
Notes

Generator protective feature. S = Standard Function; O = Optional Function.

Utility protective feature.
ANSI/IEEE
Number Function ATC-5000
Eaton
Digitrip
(Optional)
Utility Intertie Protection
Beckwith
M-3410A
(Optional)
Beckwith
M-3520
(Optional)
Schweitzer
SEL-547
(Optional)
Schweitzer
SEL-351
(Optional)
Basler
BE1-951
(Optional)
Basler
BE1-IPS100
(Optional)
21 Phase distance O
24 Overexcitation V/Hz SS
25 Synchronizer S
Synch check S S S S S S
27 Undervoltage S

SSS SSS
27G Ground undervoltage S O
32 Reverse/forward power S

SSS SSS
40 Loss-of-field S
46 Negative sequence overcurrent S

SS
47 Negative sequence overvoltage S S S S S
50 Instantaneous phase overcurrent S

S

SSSS
50N Instantaneous ground overcurrent O

SSSS
51 AC time overcurrent S

S

SSS
51N AC time ground overcurrent O

SS SSS
51V Voltage restrained overcurrent S S S
59 Overvoltage S

SSS SSS
59G Ground overvoltage S O S
59I Peak overvoltage S O
60FL VT fuse-loss detection S S S S
62 General purpose timers S
67 Phase directional overcurrent S S S
67N Residual directional overcurrent O S
72 Phase/vector shift S

79 Reconnect enable time delay S S S S
81 O/U Over/underfrequency S

SSS SSS
81R Rate of change of frequency O S