1-8 BE1-50/51B General Information 9252000991 Rev N
Burden
Burden is non-linear. Figure 1-4 illustrates the device burden.
1 Ampere Unit
0.1 amperes: Z = 120 Ω
1.0 ampere: Z = 5 Ω
5 Ampere Unit
0.5 amperes: Z = 4.8 Ω
5.0 amperes: Z = 0.2 Ω
Figure 1-4. Burden Characteristics
Frequency Response
A change of ±5 Hz from the nominal 50/60 Hz current causes <0.5% change in the current required for
pickup.
Transient Response
<10% overreach with system time constants up to 40 ms.
Harmonic Response
Figure 1-5 shows that a relay set for 1 ampere pickup would pick up at 0.96 amperes with a current
containing 40% seventh harmonic. This corresponds to a 10:1 rejection ratio. Other conditions may be
evaluated in the same manner.
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