DISTRIBUTED GENERATION EFFECTS ON PROTECTIVE RELAYING

APPLICATIONS

INNOVATIVE PROTECTION FEATURES

Microprocessor Based Programmable Protection Systems Inputs, Outputs and Operator Controls

Digital relay-relay communications

Disturbance data capturing and sequential event reporting

INPUTS AND OUTPUTS

Inputs Provide Protection System and Equipment Status

Outputs Provide Interconnection Functionality Trip and close control

Inadvertent utility energization interlocks

PROGRAMMABLE OPERATOR CONTROLS

Interconnection Control Functionality can be Easily Changed via Operator Control Programming

DIGITAL RELAY-RELAY COMMUNICATIONS

Enables Advanced Feeder/Distributed Generation Control Direct transfer trip initiated from feeder

recloser

Distributed generation control based on feeder recloser loading

Distributed generation status provided to feeder recloser

SEL MIRRORED BITS Communications

µ W ave

.....

..... .....

.....

R elay 1

D B9 C onnectors

AudioR adio

O ther

. . .

. . .

FiberSEL-28xx

R elay 2

Fiber

SEL-28xx

O ther

Transmit “Mirrored” to ReceiveR elay 1 R elay 2

TRANSMIT

RECEIVE

TRANSMIT

RECEIVE

TM B1

TM B2...

TM B8

RM B1

RM B2...

RM B8

TM B1

TM B2...

TM B8

RM B1

RM B2...

RM B8

1

0...0

0

0...0

0

0...0

1

0...0

Recloser to DG UnitMIRRORED BIT Communication

R elay 1-Feeder R ecloser R elay 2 - D G In terconnect

TRANSMIT

RECEIVE

TRANSMIT

RECEIVE

Load O K to G enerate

DTT...

TM B8

DG O ff L ine

...RM B8

DG O ff L ine

52A STATUS...

TM B8

...RM B8

1

0...0

0

0...0

0

0...0

1

0...0

52A STATUS

Load O K to G enerate

DTT

CONCLUSIONS

Programmable Protection Systems will Provide Flexibility for Future Distributed Generation Control

Digital Relay-Relay Communications will Enable Feeder Control of Distributed Generation

Programmable Operator Controls will Allow Routine Functionality Changes via Front Panel Push Button Control

Interconnection System Enhanced by Programmable Output