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d. Gradually increase the current until the INSTANTANEOUS LED lights. This should be ±7% of the setting or
±1.26 A (±126 A primary). Targets C (L3) and INSTANTANEOUS should be lit.
e. Decrease the input current to 0 and reset targets by pressing "C" on the MMI.
4. To test the 50N-2 (IN>>2) ground instantaneous unit
a. Enable the 50N-2 (IN>>2) function and disable the 50P-2 (3I>>2) function via the "Change Settings", "Primary
Settings" Menus.
b. Connect the DPU1500R as shown in Figure 11-4.
c. Apply approximately 85% of the instantaneous pickup current (18 A from Table 11-1) to the relay or 15.3 A.
d. Gradually increase the current until the INSTANTANEOUS LED lights. This should be ±7% of the setting or
±1.26 A (±126 A primary). Targets N and INSTANTANEOUS should be lit.
e. Decrease the input current to 0 and reset targets by pressing "C" on the MMI.
5. To test the 50P-3 (3I>>3) phase instantaneous unit:
a. Enable the 50P-3 (3I>>3) function and disable the 50N-2 function via the "Change Settings", "Primary Settings"
Menus.
b. Connect the DPU1500R as shown in Figure 11-3.
c. Apply approximately 85% of the instantaneous pickup current (18 A from Table 15 ) to the relay or 15.3 A.
d. Gradually increase the current until the INSTANTANEOUS LED lights. This should be ±7% of the setting or
±1.26 A (±126 A primary). Targets C (L3) and INSTANTANEOUS should be lit.
e. Decrease the input current to 0 and reset targets by pressing "C" on the MMI.
6. To test the 50N-3 (IN>>3) ground instantaneous unit:
a. Enable the 50N-3 (IN>>3) function and disable the 50P-3 (3I>>3) function via the "Change Settings", "Primary
Settings" Menus.
b. Connect the DPU1500R as shown in Figure 11-4.
c. Apply approximately 85% of the instantaneous pickup current (18 A from Table 11-1) to the relay or 15.3 A.
d. Gradually increase the current until the INSTANTANEOUS LED lights. This should be ±7% of the setting or
±1.26 A (±126 A primary). Targets N and INSTANTANEOUS should be lit.
e. Decrease the input current to 0 and reset targets by pressing "C" on the MMI.
7. To test the 2-Phase 50P (3I>>) Trip function:
a. Enable the 50P-2 (3I>>2) and 2-Phase 50P (3I>>) function via the "Change Settings", "Primary Settings"
Menus.
b. Connect the test set as shown in Figure 11-3.
c. Apply approximately 85% of the instantaneous pickup current (18 A from Table 11-2) to the relay or 15.3 A.
d. Gradually increase the current until the 50P-2 (3I>>2) relay trips. This should be ±7% of the setting or ±1.26
A (±126 A primary). This confirms phases A (L1) & B (L2). Targets A (L1), B (L2) and INSTANTANEOUS
should be lit.
e. Decrease the input current to 0 and reset targets by pressing "C" on the MMI.
f.
Connect the test set as shown in Figure 11-4, repeat tests c, d and e. This should confirm that the relay does
not trip and no INST targets light.
8. Disable the 50P-2 (3I>>2) and the 2-Phase 50P (3I>>) functions via the "Change Settings", "Primary Settings"
Menus. Connect the DPU1500R as shown in Figure 11-4 and map GRD (IN) to an available input (ex: IN4) with
logic "C", in the programmable inputs screen. (This will disable the GRD (IN) function.) Apply the fault as in step
2 and confirm that the relay will not trip on 50N-1(IN>>1).
Maintenance and Testing
ABB Distribution Protection Unit 1500R
website:www.abb.com/papd
11-9
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