User-Programmable Inverse-Time Characteristics; Ri And Rd-Type Inverse-Time Characteristics - ABB RELION 630 Series Technical Manual

1MRS757256 F
9.2.1.2
9.2.1.3
PML630/Compact Load-Shedding Solution
Technical Manual

User-programmable inverse-time characteristics

The user can define curves by entering parameters into the following standard
formula.
GUID-775FD6DE-7F45-4112-A154-79F599BBA74F V1 EN
t[s] Operate time (in seconds)
A set Curve parameter A
Curve parameter B
B set
Curve parameter C
C set
E set Curve parameter E
I Measured current
Start value
I> set
k set Time multiplier

RI and RD-type inverse-time characteristics

The RI-type simulates the behavior of electromechanical relays. The RD-type is an
earth-fault specific characteristic.
The RI-type is calculated using the formula


k
=

t s [ ]
>
I
 
− ×
0 339 0 236 . .

I
GUID-93D85F4E-FBFC-4B6D-BEF8-CBB1E8DCDB0D V1 EN
The RD-type is calculated using the formula

I
= − ×
[ ] 5 8 1 35 In . .
t s 
× >

k I
GUID-0624AC12-4B2A-43E7-8357-9D8EA9B38689 V1 EN
t[s] Operate time (in seconds)
Time multiplier
k set
I Measured current
Start value
I> set
General function block features



 




Section 9
(Equation 22)
(Equation 23)
(Equation 24)
341