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ABB Distribution Protection Unit 1500R
1-1
Protective Functions
9/99
website:www.abb.com/papd
Protective Functions
Protective Elements
The DPU1500R features a combination of protective elements as typically applied in subtransmission and distribution
protection schemes. The following text will describe the various elements, their application, and how to set them.
Summary of Protective Elements
The following Figure 1-1 summarizes all of the protective elements contained in the DPU1500R, their settings, and
factory default settings. See the following text for a complete description of each element.
Figure 1-1. DPU1500R Protective Functions
Phase Time Overcurrent Element 51P (3I>)
The phase time overcurrent element, 51P, contained in the DPU1500R is set based on CT secondary current as
connected to the phase current inputs; Sensor 1 (Ia), Sensor 2 (Ib), and Sensor 3 (Ic). See Figure 9-4 for a typical
connections drawing. Multiple time curves and time dials are available (see Table 1-1) to closely coordinate with other
devices in the system. The time-current curves included in the DPU1500R can be found later this section. User
programmable curves are available depending on the DPU1500R model ordered (see Section 10 for more details). See
Section 12 for help defining the unit model number. The 51P pickup, curve type, and time dial are all set in the Primary,
Alternate 1, and Alternate 2 settings groups. For the 51P element to operate the “Trip” contact, it must be selected in
the “Master Trip Output” mapping (see “Programmable Master Trip Contact” later in this section). 51P is set by factory
default to operate the “Trip” contact. The 51P element will always initiate reclosing unless the recloser is disabled. See
the “Reclosing” Section for more details.
50P-1
(3I>>I)
50P-2
50P-3
(3I>>3)
Undervoltage
27 (U<)
Recloser Sequence
79-1
79-2
79-4
79-3
Phase Protection
Time Overcurrent
51P (3I>)
Instantaneous
Overcurrent
Ground Protection
Time Overcurrent
51N (IN>)
Instantaneous
Overcurrent
50N-1
50N-2
50N-3
Negative Sequence
Time Overcurrent
46 (Insc>)
(3I>>2)
(IN>>1)
(IN>>2)
(IN>>3)