Generator Protection

GENERATOR PROTECTION for all your needs...

C o o p e r Pow e r S y s t e m s ’ G e n e r a t o r P ro t e c t i o n Cooper Power Systems brings you a complete line

MD32G Generator Differential

of affordable relays for the protection, control, and

The MD32G provides three-phase bias percentage differential protection for the generator. Phase and ground overcurrent backup functions are provided.

monitoring of your generator applications. From faults to abnormal operating conditions, Cooper’s Edison® Relays provide a wide range of features to meet all of your protection needs. Edison Relays are compact, easy to use devices, with simple HMI and modular construction in draw-out type cases. Each of the Edison Relays includes a rear panel

■ 87 - Bias percentage slope differential protection ■ 87N/51N - Stator ground overcurrent or stator ground differential protection ■ 51 - Stator phase overcurrent protection

mounted RS-485 communications port with Modbus protocol. A bright luminescent display and eight LED targets provide visual monitoring of the relay’s status. Relay status, as well as event records may also be obtained from the communications port using Edison®Com Software. Obtain the benefits of microprocessor technology, without loosing the security of multiple relays protecting your system. Seven different Edison Relays include a wide variety of generation protection, control, and monitoring

MG30 Generator Protection The MG30 is ideally suited for the protection of medium generators, or as the core of a protection package for large generators where the generator neutral is impedance grounded. The MG30 provides all of the basic protective functions required for generator protection. For large generators, MG30 can be provided with the MD32G relay in a dual case design. This provides redundancy and flexibility in the protection package design.

functions. As specific purpose relays, Edison Relays can be used independently or combined together to protect small to large generator systems. And by using Edison Relays, you don’t have to worry about placing all of your protection in a single black box.

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21 - System impedance backup 24 - Overexcitation-V/Hz 27 - Undervoltage 27TN - 100% stator ground protection 32 - Reverse power 37 - Underpower 40 - Loss of field 46 - Negative sequence overcurrent 49 - Stator thermal imaging 50BF - Breaker failure 50/27 - Inadvertent energization 50/51-V - Time and instantaneous phase overcurrent with or without voltage restraint ■ 59 - Overvoltage ■ 59GN - 95% stator ground protection ■ 60FL - Fuse failure detection ■ 81 - Two frequency elements

and Control Relays IM3G-V Generator Protection The IM3G-V is ideally suited for the protection of small generators, or as the core of a protection package for medium or large generators that are low impedance grounded. For large generators, the IM3G-V can be provided with the MD32G relay in a dual case design. This provides redundancy and flexibility in the protection package design. ■ ■ ■ ■ ■ ■ ■

27 - Undervoltage 32 - Reverse power 37 - Underpower 40 - Loss of field 46 - Negative sequence overcurrent 49 - Stator thermal imaging 50/51-V - Time and instantaneous phase overcurrent with or without voltage restraint ■ 59 - Overvoltage ■ 81 - Two frequency elements

IM30G Generator Protection The IM30-G is ideally suited for the protection of small generators, or as the core of a protection package for medium size generators. ■ 32 - Reverse power ■ 40 - Loss of field ■ 46 - Negative sequence overcurrent ■ 50/51 - Time and instantaneous phase overcurrent ■ 50/51G - Stator ground fault ■ 50BF - Breaker failure

SPM21 Generator Synchronizing Relay The SPM21 is a complete generator synchronizing relay. The relay measures the voltage and the frequency for the generator and the reference bus. When the measured quantities are within acceptable limits, the relay calculates the phase angle between the reference bus voltage and the generator voltage. SPM21 provides a signal in the form of a

contact closure to correct the machine’s speed and regulation in order to bring the phase angle within set limits. A close command is issued if the measured angle is within the limits and decreasing. ■ ■ ■ ■

Automatic synchronizing of the generator Live and dead-bus operation Anti-motoring control Kicker pulse control

SCM21 Synch-check Relay The SCM21 provides synch-check supervision for two lines connected to a common bus. Voltage and frequency levels for both lines and the bus are monitored. The relay will close its output if the measured voltage, frequency, and phase angle for the lines and the bus are within limits. ■ Synch-check control for one or two lines against a common bus ■ Voltage, frequency, and phase displacement check for each line and a common bus ■ Over/Under voltage inhibit functions ■ Over/Under frequency inhibit functions

UM30-SV Generator Islanding Protection UM30-SV provides protection against generator islanding. The relay also provides voltage, frequency, and overexcitation protection. The UM30SV is ideal for co-gen applications where generator islanding detection is critical. ■ Detection of generator islanding ■ 24 - Two levels of Volts/Hz protection ■ 81 - Two levels of frequency protection ■ 27/59 - Two levels of voltage protection ■ 27/59 - Positive-sequence voltage protection ■ 59 - Negative-sequence overvoltage protection ■ 59 - Two levels of zero-sequence overvoltage protection

19” Rack Mount Protection Packages Any combination of Edison generator relays can be put together to provide a custom protection package. Up to four Edison relays can be provided in a 19” rack. These custom packages provide the user with a comprehensive generator protection system that is equipped with multiple processors and multiple power supplies for increased reliability and redundancy. In this example, the following functions are provided with the MD32G, MG30, SPM21, and SCM21 protection package: ■ ■ ■ ■ ■ ■

21 - System impedance backup 24 - Overexcitation-V/Hz 25 - Synch-check supervision 27 - Undervoltage 27TN - 100% stator ground protection 32 - Reverse power

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37 - Underpower 40 - Loss of field 46 - Negative sequence overcurrent 49 - Stator thermal imaging 50BF - Breaker failure 50/27 - Inadvertent energization 50/51-V - Time and instantaneous phase overcurrent with or without voltage restraint ■ 51 - Stator phase overcurrent protection ■ 59 - Overvoltage ■ 59GN - 95% stator ground protection ■ 60FL - Fuse failure detection ■ 81 - Two frequency elements ■ 87 - Bias percentage slope differential protection ■ 87N/51N - Stator ground overcurrent or stator ground differential protection ■ Automatic synchronizing of the generator ■ Live and dead-bus operation ■ Anti-motoring control ■ Kicker pulse control

87 G 87 N Is la n M d et er in g

50 /2 50 7 /5 50 1-V B 50 F N 51 51 N 59 59 N 59 EG PO 59 S Z 60 ER FL O 81 86

49 50

40 46

21 24

ANSI Functions

25 25 S 27 27 PO 27 S T 32 N 37

Edison Relay Application Chart

Edison Relay Model MD32G Generator Differential MG30 Generator Protection

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SPM21 Synchronizer

UM30-SV Islanding Protection

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© 1999 Cooper Industries, Inc. Edison® is a registered trademark of Cooper Industries, Inc. Printed in USA Bulletin 99066 September 1999 New Issue

Protective Relays and Integrated Systems Thomas A. Edison Technical Center P.O. Box 100 11131 Adams Road Franksville, WI 53126-0100 (262)-835-5777 fax:(262)-835-1515 www.cooperpower.com