Hitachi Relion 670 Series Product Manual page 62
Phasor measurement unit
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Phasor measurement unit RES670
Version 2.2
Table 36. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function
Reference current
Reference temperature
Operate time:
,
2
2
I
I
σ
<
p
t
ln
,
T
T
2
,
Trip
Amb
√
I
T
ref
EQUATION13000039 V3 EN-US
T
= set operate temperature
Trip
T
= ambient temperature
Amb
T
= temperature rise above ambient at I
ref
I
= reference load current
ref
I = actual measured current
I
= load current before overload occurs
p
Alarm temperature
Operate temperature
Reset level temperature
Table 37. Directional underpower protection GUPPDUP
Function
Power level
for Step 1 and Step 2
Characteristic angle
for Step 1 and Step 2
Independent time delay to operate for Step 1
and Step 2 at 2 x S
to 0.5 x S
r
Table 38. Directional overpower protection GOPPDOP
Function
Power level
for Step 1 and Step 2
Characteristic angle
for Step 1 and Step 2
Operate time, start at 0.5 x S
k=0.000
Reset time, start at 2 x S
to 0.5 x S
r
k=0.000
Independent time delay to operate for Step 1
and Step 2 at 0.5 x S
to 2 x S
r
62
Range or value
(2-400)% of IBase
(0-300)°C, (0 - 600)°F
Time constant t = (1–1000)
minutes
2
I
ref
(Equation 1)
ref
(0-200)°C, (0-400)°F
(0-300)°C, (0-600)°F
(0-300)°C, (0-600)°F
Range or value
(0.0–500.0)% of SBase
(-180.0–180.0) degrees
(0.01-6000.00) s
and k=0.000
r
Range or value
(0.0–500.0)% of SBase
(-180.0–180.0) degrees
to 2 x S
and
Min. =10 ms
r
r
Max. = 25 ms
and
Min. = 35 ms
r
Max. = 55 ms
(0.01-6000.00) s
and k=0.000
r
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M12352-1 v15
Accuracy
±1.0% of I
± 1.0°C, ±2.0°F
IEC 60255-149, ±5.0% or ±200 ms whichever is greater
±2.0°C, ±4.0°F
±2.0°C, ±4.0°F
±2.0°C, ±4.0°F
SEMOD175152-2 v11
Accuracy
±1.0% of S
±1.0% of S at S > S
where
=
S
1.732
r
±2.0 degrees
±0.2% or ±40 ms whichever is greater
SEMOD175159-2 v9
Accuracy
±1.0% of S
±1.0% of S at S > S
±2.0 degrees
±0.2% or ±40 ms whichever is greater
1MRK 511 410-BEN P
r
at S ≤ S
r
r
r
×
×
U
I
r
r
at S ≤ S
r
r
r
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