SEL SEL-700G Generator Protection Relay

SEL-700G Generator Protection Relay

Comprehensive protection for large,

medium, and small generators

• Provide primary and backup generator protection with current,

voltage, frequency, distance, power, and out-of-step elements.

• Achieve 100 percent stator ground protection with full winding

coverage.

• Use the automatic synchronizer and event reports to analyze

generator startup, shutdown, or system faults.

• Support installations with low-energy analog (LEA) voltage sensors,

Rogowski coils, and low-power current transformers (LPCTs).

• Improve network recovery via alternate paths in a network

with the Rapid Spanning Tree Protocol (RSTP).

Model Comparison Table

You can customize the SEL-700G for specific applications by selecting

preconfigured model options.

Model

Application

SEL-700G0 or SEL-700G0+

Basic generator protection

SEL-700G1 or SEL-700G1+

Full generator protection

SEL-700GT

Intertie protection

SEL-700GT+

Intertie and generator protection

SEL-700GW

G

Basic dual-feeder protection

ANSI Numbers/Acronyms and Functions

21C/51VC Compensator Distance, Voltage

Restrained/Controlled Time Overcurrent

24 Volts/Hertz

25G Generator Synchronism Check

25T Tie Synchronism Check

27 Undervoltage

27I Inverse-Time Undervoltage

27S Synchronism Undervoltage

32 Directional Power

40 Loss of Field

46 Current Unbalance

49R Thermal Overload (Resistance Temperature

Detector [RTD])

49T Thermal Model

50N Neutral Overcurrent

50 (P,G,Q) Overcurrent (Phase, Ground, Neg. Seq.)

51 (P,G,Q) Time Overcurrent (Phase, Ground, Neg. Seq.)

51C Voltage-Controlled Phase Time Overcurrent

51N Neutral Time Overcurrent

51V Voltage-Restrained  Phase Time Overcurrent

59I Inverse-Time Overvoltage

59N (64G1) Neutral Overvoltage

59S Synchronism Overvoltage

59 (P,G,Q) Overvoltage (Phase, Ground, Neg. Seq.)

60 Loss of Potential

64F Field Ground

64G 100% Stator Ground

67 (P,G,Q) Directional Overcurrent (Phase, Ground,

Neg. Seq.)

67N Directional Neutral Overcurrent

Continued

77 Telemetering Device

78 Out of Step

78VS Vector Shift

81 (O,U,R) Frequency (Over, Under, Rate)

87 Three-Phase Current Differential

87N Neutral Current Differential

REF Restricted Earth Fault

Additional Functions

52PB Pushbutton Trip/Close

85 RIO SEL Mirrored Bits® Communications

BF Breaker Failure

BRM Breaker Wear Monitor

DFR Event Reports

ENV SEL-2600

HMI Operator Interface

LDP Load Data Profiling

LEA LEA Voltage Sensor Inputs and Rogowski

Coil/LPCT Inputs

LGC SELogic® Control Equations

MET High-Accuracy Metering

PMU Synchrophasors

RTU Remote Terminal Unit

SER Sequential Events Recorder

WEB Web Server

Key Features

Comprehensive Generator Protection

Connect the SEL-700G Generator Protection Relay across small, medium, or

large generators for complete primary and backup protection. Adding the neutral

voltage connection provides 100 percent stator ground protection, based on

fundamental-frequency and third-harmonic neutral voltage measurements.

Connecting the neutral current input provides protection for solidly grounded

or resistance-grounded generators.

Automatic Synchronizer

Replace external generator control and synchronizer relays with the built-in

automatic synchronizer function. The SEL-700G automatically synchronizes

the frequency, voltage, and phase control of the generator with the power

system. Generator start reports and the PC-based synchroscope allow you to

monitor the generator synchronization. The built-in automatic synchronizer

function is available on select SEL-700G models.

LEA Sensor Inputs

The SEL-700G can be ordered with LEA inputs to support medium- and low

voltage applications that use low-energy voltage sensors and Rogowski coils

or other low-power current sensors. Order your device with the combination

of LEA current and voltage inputs that suits your application.

Islanding Protection

Detect islanding conditions using the vector shift function. The vector shift

function provides another element of protection for distributed generators

connected to the utility network. It operates within three cycles—fast enough

to prevent out-of-synchronization reclosing with the network feeders to avoid

generator damage.

Easy Communications

Choose from single or dual copper or fiber-optic Ethernet ports,

serial communications, and several protocols, including Mirrored Bits

communications, RSTP, IEC 61850 Edition 2. EtherNet/IP, the IEEE 1588 Precision

Time Protocol (PTP) (firmware-based), IEC 60870-5-103. and the Parallel

Redundancy Protocol (PRP). Multiple Modbus TCP or Modbus serial sessions

are available for custom configuration of your application. You can also use

DNP3 serial or DNP3 LAN/WAN protocols. In addition, the IEC 61850 test mode

enables in-service testing, which reduces commissioning time.