testingtransformerdifferentialrelays
DESCRIPTION
brief explanation on diff. relays testing methods including the factors to be tested for 87n relaysTRANSCRIPT
TESTING TRANSFORMER DIFFERENTIAL RELAYSRELAYS
Néstor CasillaGaudioso de GuiaD bl E i i CDoble Engineering Company
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
1. Introduction.1. Introduction.2. Protection Functions for Power Transformer.3 Test Plan3. Test Plan.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
1 Introduction1. Introduction.
F l d d th t tiFor several decades, the protectionrelays of power system have undergonemany important changesmany important changes.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
ELECTRONIC RELAYELECTROMECHANICAL
RELAY ELECTRONIC RELAYRELAY
MICROPROCESSOR RELAYS
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
1 Introduction1. Introduction.A modern transformer protection and control
system has many features that reflect the trendssystem has many features that reflect the trendsof integration, such as:
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
Differential Protection for two or three windingDifferential Protection for two or three winding transformer.
Second Harmonic BlockingSecond Harmonic Blocking.
Fifth Harmonic Blocking .
Restricted Earth Fault Element.
Phase Overcurrent Protection.
Ground Overcurrent Protection.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
Over/Under voltage Elements.Over/Under voltage Elements. Frequency Elements.Thermal ElementThermal Element.Events recorder.Fault recorderFault recorder.Applications base on the IEC61850 standard.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
The new protection features must be tested inThe new protection features must be tested indifferent system known conditions, which caninfluence both its performance and safety.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.1 Transformer Differential Protection.2.1 Transformer Differential Protection.It is the most important transformer protectionfunction.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
Idiff = I1 + I2
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
The advantage of microprocessor technology isg p gythat each manufacturer defines their ownalgorithms, features and parameters to adjustthe differential function.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
Setting:1. Turn Point 1: Fixed2 T P i t 2 V i bl
ABB RET543 RELAY
2. Turn Point 2: Variable3. Slop 1: Variable4. Slop 2: Fixed
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
SIEMENS 7UT51X RELAY
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
Iop= I1 + I2Iop= I1 + I2
Irst= (|I1 | + |I2 |)/k
SEL RELAY
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
BECKWITH RELAY
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
Another point to consider is the new option to filterp pthe zero sequence component of phase currents.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.2 Blocking Function For harmonic blocking, the harmonic content of the differential current must exceed the individual threshold valuesthreshold values
Second Harmonic for inrush conditions
Fifth Harmonic for overexcitation conditions.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.3 Restricted Earth Fault Element.This element provides sensitive protection against
ground faults in wye-connected transformerwindingwinding.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.4 Phase and Ground Overcurrent Protection.IED id t l tIED provides numerous overcurrent elements per winding. Ph d tiPhase, ground or negative sequenceinstantaneous/definite time elements areavailable for single- or three-pole feederavailable for single or three pole feederprotection, breaker failure protection,transformer backup protection, etc.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.5 Transformer and CT connectioncompensationcompensationTransformer and CT connection compensationadjusts the sets of three phase currents for theadjusts the sets of three-phase currents for thephase angle and phase interaction effectsintroduced by the winding connection of theintroduced by the winding connection of thetransformer and CTs.
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.5 Transformer and CT connection compensation
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.5 Transformer and CT connection compensation
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
2. Protection Functions for Power Transformer.
2.5 Transformer and CT connection compensation
ABC Rotation
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
3.1 Steady State Test- Pickup of differential, overcurrent,overvoltage or undervoltage functions.- Blocking functions
Differential Characteristic- Differential Characteristic- Overcurrent Characteristic
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Test set connection
CT1I1
I2
RELÉ
CT2
CT3
I2
I3
I4
CT6
CT4
CT5I5
I6CT6
TRIP
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
0.522 * sqrt(3) = 0.904q ( )
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
YY Transformer
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Iop= I1 + I2Iop= I1 + I2
Irst= (|I1 | + |I2 |)/k
SEL RELAY
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
DABY Transformer
ABC Rotation
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
XX
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
3.2 Dynamic Tests ( SSIMUL )- 2nd and 5th Harmonic blocking function- Trip with 2nd and 5th Harmonicp- Trip with 2nd Harmonic in one phase
No operation with 5th harmonic in one phase- No operation with 5th harmonic in one phase- External fault simulation- Internal fault simulation
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL )3.2 Dynamic Tests ( SSIMUL )
Trip for 2nd Harmonic 3 Phase Test (PCT2 = 15%)
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL )3.2 Dynamic Tests ( SSIMUL )
Trip for 5th Harmonic 3 Phase Test (PCT5 = 35%)
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL )3.2 Dynamic Tests ( SSIMUL )
Internal Fault
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL )3.2 Dynamic Tests ( SSIMUL )
Internal Fault
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL )3.2 Dynamic Tests ( SSIMUL )
External Fault
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL )3.2 Dynamic Tests ( SSIMUL )
External Fault
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan
3.3 Transient Tests ( TRANS – COMTRADEFiles )Files )- 2nd and 5th Harmonic blocking function
d h- Trip with 2nd and 5th Harmonic- Trip with 2nd Harmonic in one phase- No operation with 5th harmonic in one phaseExternal fault simulation- External fault simulation
- Internal fault simulation
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan3.3 Transient Tests
2nd Harmonic - DATC
3.3 Transient Tests
2nd Harmonic - DATC
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan3.3 Transient Tests
2nd Harmonic – COMTRADE file
3.3 Transient Tests
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan3.3 Transient Tests
Internal Fault – COMTRADE file
3.3 Transient Tests
DifferentialSensibilization
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
3. Test Plan3.3 Transient Tests
Overexcitation – COMTRADE file
3.3 Transient Tests
ff
Blocking Enable
DifferentialSensibilization
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
Doble International Protection Testing Users Group ConferenceAustin TX – Oct 13 – 14 2010