Power Plant Equipment Protection
ED2-G

Relay protection IED ED2-G is designed to provide comprehensive protection of power plant equipment:

generator
thyristor self-excitation system
unit transformer
auxiliary transformer
backup auxiliary transformer
generator circuit-breaker control automation featuring automatic synchronization

The ED2-G has two size types: housing width 3/4 and 1 × 19 inches.

Front panel

Large display with mimic diagram

On/Off electronic switches used to enable/disable relay protection and automation functionalities directly from the device front panel

Two-color LEDs (green/red), latching or non-latching

The following buttons are provided on the IED front panel:

IED control buttons
circuit-breaker control functional buttons
digital keyboard

Ethernet for PC connection, USB for Flash drive connection

Rear view

IED is powered from sources of 110 VDC, 220 VDC

Maximum total amount of analog circuits is 48

Up to 256 freely configurable binary inputs/outputs

IED has 2 RS485 ports and up to 3 Ethernet ports supporting protocols IEC 60850-103/104, Modbus RTU/TCP, GOOSE, MMS (IEC 61850). For IEDs supporting IEC 61850, RJ45 or duplex LC Ethernet ports are provided featuring PRP hardware redundancy capability

IED supports multiple types of hardware synchronization:

PPS:
- Differential communication line (twisted pair, using optional converter)
- Fiber-optic line (using optional converter)
- 24 V synchronization pulse
IRIG-B:
- Differential communication line (twisted pair)
- Fiber-optic line (using optional converter)

Designed for their quick replacement with no need to dismantle the IED

ED2-G functions are depends on an individual project on the basis of customer requirements, manufacturers of core equipment and for a particular object.

ED2-G main protection functions	ANSI code	ED2-G

Generator differential protection	87G	O
Negative Phase Sequence / Unbalanced-load protection	46	O
Overload protection	49	O
Distance protection	21	O
Voltage Controlled Overcurrent protection	50G/27G	O
Excitation Loss protection	40	O
Pole slip protection	78	O
Overexcitation protection	24	O
Overvoltage protection	59	O
Over-/Under Frequency protection	81	O
Directional overpower protection	32	O
Overcurrent protection	50G	O
Sensitive ground fault protection	64	O

Earth-fault protection	64S/50N	O
Directional earth-fault protection	67N	O
95% Earth-fault protection	59N	O
100% Earth-fault protection (with 3-d harmonics)	64S	O
100% Earth-fault protection (with current and voltage harmonics control)	64S	O

Rotor overload protection (current depended characteristic)	49R	O
Rotor overload protection (with rotor current converter)	49R	O
Rotor overload protection (with rotor 4..20mA sensor)	49R	O
Rotor earth-fault protection (with 17 Hz signal injection)	64R	O
Generator rotor unlimited forcing current protection	50R	O
Generator rotor unlimited forcing current protection (with rotor 4..20mA sensor)	50R	O
Generator rotor unlimited forcing time protection	50R	O
Generator rotor unlimited forcing time protection (with rotor 4..20mA sensor)	50R	O
Generator unsuccessful inverting protection	50R	O
Reserve excitation system forcing	27	O

Transformer differential protection	87T	O
Buchholz relay	63T	O
High voltage bushing insulation monitoring	98	O
Earth-fault protection (for HV side)	50N/51N	O
Residual overvoltage protection (for HV side)	59N	O
Insulation monitoring (Generator voltage side)	59N	O
Transformer distance protection	21T	O
Transformer Voltage Controlled Overcurrent protection	50Т/27Т	O
Transformer overcurrent protection	50T	O
Inrush current blocking	68T	O
Transformer overexcitation protection	24T	O
Protection against symmetric overload of the transformer	49Т	O
VT circuits control	60T	O
Undervoltage protection	27Т	O

Tripping logic	94	O
Trip circuit supervision	74TC	O
Breaker failure protection	50BF	O
Synchrocheck and synchronizing	25	O
Autorecloser (3 phase)	79	O
Lockout	86	O
Fuse Failure/ VT Supervision	60	O
Circuit breaker control / Supervision	52	O
Open Pole Detector		O
Switchgear interlocking		O

Frequency		O
Synchroscope		O
Digital voltmeter		O
Three-phase Measurement
One-phase Measurement

Disturbance recorder
Event recorder
Self-test function

— basic functions

O — optional functions

Multitasking

Structurally, the IED is made as a set of units combined into a cassette. The IED platform with its modular architecture of hardware units enables device adapting to any primary facility layout. All binary inputs, relays, LEDs, switch buttons can be freely assigned

IED operation in extended frequency range

Depending on configuration, the device is able to operate within frequency range from 3 to 95 Hz

Functional flexibility

ED2-G functions are depends on an individual project on the basis of customer requirements, manufacturers of core equipment and for a particular object

Generator protections

Generator protection functionalities cover all performance features of hydraulic turbine generators, thermal power plant generators, including gas turbine generators

Specification	Value

Rated alternating current, A	1 or 5 (selected via software)
Rated frequency, Hz	50
Rated AC voltage, V	100
Rated auxiliary DC voltage, V	220 / 110

Operational Voltage Range	-20 % … +20 %
Interruption, ms	120

Recommended for continuous operation (according to IEC 60255-1), °C	-10 … +55
Permissible temporary operation temperature, °C	-25 … +60
Long-term storage and transportation temperature, °C	-40 … +70
Altitude, m	up to 2,000
Upper humidity value, %	80
Ingress protection (IP) degree	IP52 — front panel IP20 — rear panel

Permissible overload of current inputs, continuous	5 * I_r
Permissible overload of current inputs, 1s	100 * I_r
Burden at I_r, VA	<0,5
Permissible overload of voltage inputs, continuous	3 * U_r
Burden at U_r, VA	<0.1

Maximum switching voltage, V	250
Continuous current, А	8
Switching capacity of contacts (making current)	up to 30 А for 0.20 s
Maximum operation time, ms	10

Power Plant Equipment ProtectionED2-G

Graphic display

Electronic switches

Two-color LEDs

Functional control

IED interfaces

Hot swap power supply (optional)

Analog inputs

Binary inputs/outputs

Communication interfaces

Hardware synchronization

Compartments offering access to the IED’s memory card and lithium battery

Functions

Features

Specifications

Documents

Power Plant Equipment Protection
ED2-G