SEL SEL-700BT Motor Bus Transfer Relay

SEL-700BT Motor Bus Transfer Relay

Comprehensive Motor Bus Transfer

Protective Relay

The SEL-700BT relay provides unsurpassed protection, integration, and control features in a flexible, compact, and cost

effective package.

➤ Comprehensive Motor Bus Transfer Features. Restore power before your motor slows down. The SEL-700BT

supports sequential and simultaneous transfer modes. The relay is designed to support four methods of MBT: fast,

in-phase, residual voltage, and fixed time. Initiate MBT manually or use the settings to select one of the automatic

transfer modes. The relay automatically selects one of the transfer modes based on the system condition.

➤ Basic Protection Features.

➢ Phase, negative-sequence, residual-ground, and

neutral-ground overcurrent elements

➢ Phase, negative-sequence, residual-ground, and

neutral-ground time-overcurrent elements

➢ Directional phase, negative-sequence, and

residual-ground overcurrent elements

➢ Breaker failure protection for three-pole

breakers

➢ Under- and overvoltage elements

➢ Inverse-time over- and undervoltage elements

➢ Loss-of-potential elements

➢ Over- and underfrequency protection elements

➢ Rate-of-change-of-frequency elements

➢ RTD protection (requires internal or external

SEL-2600 RTD option).

➤ Additional Protection Features. Synchronism-check elements; synchronism-check under- and overvoltage

elements; inverse-time over- and undervoltage elements; synchroscope; and vector shift elements for islanding

detection.

➤ Optional Low-Energy Analog (LEA) Voltage Sensor Inputs and Rogowski Coil/LPCT Currents Inputs. The

LEA input range for voltages is as high as 8 Vac rms. Based on the nominal feeder current, the relay automatically

sets the gain for the LEA current channel inputs, which allows for a wide range of primary currents.

➤ Operator Controls. Eight programmable front-panel pushbuttons each with two programmable tricolor LEDs

allow for a wide variety of uses, including easy trip and close control and status indications for a breaker.

Implement local and remote operator control schemes using 32 local and 32 remote control bits.

➤ Integrated Web Server. Log in to the built-in web server to view metering and monitoring data and to download

events, Sequential Events Recorder (SER), etc. Use the web server to view relay settings and to perform relay

firmware upgrades.

➤ Relay and Logic Settings Software. ACSELERATOR QuickSet® SEL-5030 Software reduces engineering costs

for relay settings and logic programming. The tools in QuickSet make it easy to develop SELOGIC® control

equations. Use the built-in phasor display to verify proper CT polarity and phasing. Use the synchroscope for

synchronism-check elements.

➤ Metering and Reporting. Built-in metering functions eliminate separately mounted metering devices. Analyze

SER reports and oscillographic event reports for rapid commissioning, testing, and post-fault diagnostics.

Unsolicited SER protocol allows station-wide collection of binary SER messages.

➤ Front-Panel HMI. Navigate the relay HMI using a 5-inch, color, 800 x 480-pixel touchscreen display.

➤ Additional Standard Features. Includes Modbus® RTU, Event Messenger support, Mirrored Bits®

communications, load profile and breaker wear monitoring, 128 remote analogs, support for 12 external RTDs

(SEL-2600 module), IRIG-B input, advanced SELOGIC, configurable labels, and fiber-optic serial port.

➤ Optional Communications Protocols. Optional communications protocols include IEC 61850 Edition 2. Modbus

TCP/IP, Simple Network Time Protocol (SNTP), IEEE 1588-2008 firmware-based PTP, EtherNet/IP, DNP3 LAN/

WAN, DNP3 serial, IEC 60870-5-103. RSTP, and PRP. With an Ethernet equipped relay, use the integrated web

server to view settings and metering and monitoring data, download reports, and upgrade firmware.

➤ Optional Communications Ports. Elective communications ports include EIA-232 or EIA-485 multimode fiber

optic serial port and single or dual, copper or fiber-optic Ethernet ports.

➤ Optional I/O Cards. Digital and analog I/O options include 4 AI/4 AO, 4 DI/4 DO, 8 DI, 8 DO, 8 AI, 3 DI/4 DO/

1 AO, 4 DI/3 DO, and 14 DI. An optional 10 internal RTD card is also available for the SEL-751. Conformal

coating for chemically harsh and/or high moisture environments is also available as an option.

➤ Language Support. Choose English or Spanish for your serial ports, including the front-panel serial port. The

standard relay front-panel overlay is in English; a Spanish overlay is available as an ordering option.

➤ Sequential Events Recorder

➤ Event Reports

➤ Web Server

➤ SEL ASCII, Ethernet*, Modbus TCP*, SNTP*,

IEEE 1588 firmware-based PTP* IEC 61850*,

IEC 60870-5-103*, EtherNet/IP, RSTP*, PRP*,

DNP3 LAN/WAN*, DNP3 Serial*, Modbus RTU,

Telnet*, and FTP*

➤ Eight Front-Panel Target LEDs, Six of Which Are

Programmable

➤ Two Inputs and Three Outputs Standard

➤ I/O Expansion*—Additional Contact Inputs, Contact

Outputs, Analog Inputs, Analog Outputs, and RTD

Inputs

➤ Single or Dual Ethernet Copper or Fiber-Optic

Communications Port*

Figure 1 SEL-700BT Motor Bus Transfer Relay

SEL-2600

➤ Battery-Backed Clock, IRIG-B Time

Synchronization

➤ Instantaneous Metering, Demand Metering

➤ Eight Programmable Pushbuttons Each With Two

Tricolor LEDs

➤ Advanced SELOGIC Control Equations

➤ 32 Programmable Display Messages

➤ MIRRORED BITS Communications

➤ Breaker Wear Monitor

➤ Event Messenger Compatible

➤ Front-Panel HMI With 5-Inch, Color,

800 x 480 Pixel Touchscreen Display

Instantaneous Overcurrent Elements

5

Combined Overcurrent Elements

The following instantaneous overcurrent elements are

provided in the SEL-700BT as shown in Table 2. All

instantaneous overcurrent elements provide torque

control and definite-time delay settings.

➤ As many as six instantaneous phase overcurrent

elements (50P) with peak detection algorithms to

enhance element sensitivity during high-fault

current conditions where severe CT saturation may

occur.

➤ As many as two instantaneous negative-sequence

overcurrent (50Q) elements.

➤ As many as two residual-ground instantaneous

overcurrent (50G) elements. These elements use

calculated residual (3I0) current levels.

➤ As many as two neutral instantaneous overcurrent

elements (50N).

Directional Instantaneous Overcurrent

Elements

The following directional overcurrent elements are

available in the SEL-700BT with directional control (see

Table 2).

➤ As many as two directional phase overcurrent

elements (67P).

➤ As many as two directional negative-sequence

overcurrent elements (67Q).

➤ As many as two directional residual-ground

overcurrent elements (67G).

Time-Overcurrent Elements

The SEL-700BT provides the time-overcurrent elements

listed in Table 2. These time-overcurrent elements

support the IEC and US (IEEE) time-overcurrent

characteristics. Electromechanical disc reset capabilities

are provided for all time-overcurrent elements.

➤ As many as two phase time-overcurrent (51P)

elements are provided. These phase elements

operate on the maximum of phase currents. One

51P element has directional control.

➤ As many as two negative-sequence time

overcurrent (51Q) elements are provided. These

elements operate on the calculated negative

sequence current for each set of three-phase inputs.

One 51Q element has directional control.

➤ As many as two residual time-overcurrent (51G)

elements are provided. These elements use

calculated residual (3I0) current levels. Both 51G

elements have directional control.

➤ One neutral time-overcurrent (51N) element is

provided with directional control.

The combined overcurrent elements can be used for

equipment connected to a ring-bus or breaker and one

half systems. Each combined winding current supports

two levels of instantaneous overcurrent (50P) elements,

one time overcurrent (51P) element, two instantaneous

residual overcurrent (50G) elements, and one residual

time overcurrent (51G) element.

Synchronism Check Elements

(25X and 25Y)

The SEL-700BT has a synchronism-check function on

both the X-side and the Y-side that provides the closing

window for the breaker when connecting to the utility

system.

Synchroscope

The touchscreen display comes with a built-in

Synchroscope application in the Monitor folder, which

displays a graphical representation of the phasor differ

ence between the bus and the feeder, as shown in