Basler Electric BE1-87B - Manual (Page 13)

SECTION 1
• GENERAL INFORMATION
General
The BE1-87B is a high-speed, high-impedance, solid-state differential relay. It was designed specifically
for bus differential protection. Because of the relay’s high impedance, it can be used in other applications,
such as the protection of shunt reactors. Contact your local Basler Applications Engineer for information
about additional applications.
Features
The BE1-87B offers high-speed fault protection, which may be applied to individual elements or zones of
ac power systems. It operates in less than 7 milliseconds for fault levels of 1.5 times the current pickup
and less than 5.5 milliseconds for fault levels above six times the current pickup. This high-speed
operation minimizes potential damage to the protected equipment. Response characteristics for sensing
input ranges one and two are shown in Section 5, Testing.
Standard Features
Available in single-phase or three-phase models
• S1 and M1 double ended drawout cases and 19” rack-mount
• Percent of pickup voltage alarm
• Differential logic test
• LED trip output indicators
• Power supply status
• Ten position incremental adjust for the voltage and current pickup settings
Model and Style Number
The electrical characteristics and operational features included in a specific relay are defined by a
combination of letters and numbers, which constitutes the device’s style number. The style number
together with the model number describes the features and options in a particular device and appears on
the front panel as the item number. They also appear in the drawout cradle, and inside the case
assembly. The model number BE1-87B designates the relay as a Basler Electric Class 100, high-
impedance bus differential relay. The style chart is shown in Figure 1-1.
Figure 1-1. BE1-87B Style Chart
9282300990 Rev P BE1-87B Application 1-1