brief explanation on diff. relays testing methods including the factors to be tested for 87n relays
brief explanation on diff. relays testing methods including the factors to be tested for 87n relays
TESTING TRANSFORMER DIFFERENTIAL RELAYS
Néstor Casilla Gaudioso de Guia D bl E Doble Engineering i i C Company Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
1. 2. 3 3.
Introduction. Protection Functions for Power Transformer. Test Plan. Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
1 1.
Introduction. For severall decades, F d d th the protection t ti relays of power system have undergone many important changes. changes
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
ELECTROMECHANICAL RELAY
ELECTRONIC RELAY
MICROPROCESSOR RELAYS Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
1 Introduction. 1. Introduction A modern transformer protection and control system has many features that reflect the trends of integration, such as:
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
¾
Differential Protection for two or three winding transformer.
¾
Second Harmonic Blocking. Blocking
¾
Fifth Harmonic Blocking .
¾
Restricted Earth Fault Element.
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Phase Overcurrent Protection.
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Ground Overcurrent Protection. Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
¾ ¾ ¾ ¾ ¾ ¾
Over/Under voltage Elements. Frequency Elements. Thermal Element. Element Events recorder. Fault recorder recorder. Applications base on the IEC61850 standard.
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
The new protection features must be tested in different system known conditions, which can influence both its performance and safety.
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2. Protection Functions for Power
Transformer. 2.1 Transformer Differential Protection. It is the most important transformer protection function.
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
Idiff = I1 + I2
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
The advantage g of microprocessor p technology gy is that each manufacturer defines their own algorithms, features and parameters to adjust the differential function.
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
ABB RET543 RELAY
Setting: 1. Turn Point 1: Fixed 2 Turn 2. T Point P i t2 2: Variable V i bl 3. Slop 1: Variable 4. Slop 2: Fixed
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
SIEMENS 7UT51X RELAY Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
Iop= I1 + I2 Irst= (|I1 | + |I2 |)/k
SEL RELAY Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
BECKWITH RELAY Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2.1 Transformer Differential Protection
Another p point to consider is the new option p to filter the zero sequence component of phase currents.
Doble International Protection Testing Users Group Conference Austin 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 values ¾ Second Harmonic for inrush conditions ¾ Fifth Harmonic for overexcitation conditions.
Doble International Protection Testing Users Group Conference Austin 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 transformer winding. winding
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2. Protection Functions for Power
Transformer. 2.4 Phase and Ground Overcurrent Protection. IED provides id numerous overcurrentt elements l t per winding. Ph Phase, ground d or negative ti sequence instantaneous/definite time elements are available for single single- or three three-pole pole feeder protection, breaker failure protection, transformer backup protection, etc.
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2. Protection Functions for Power
Transformer. 2.5 Transformer compensation
and
CT
connection
Transformer and CT connection compensation adjusts the sets of three-phase three phase currents for the phase angle and phase interaction effects introduced by the winding connection of the transformer and CTs.
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2. Protection Functions for Power
Transformer. 2.5 Transformer and CT connection compensation
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
2. Protection Functions for Power
Transformer. 2.5 Transformer and CT connection compensation
Doble International Protection Testing Users Group Conference Austin 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 Conference Austin 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 - Overcurrent Characteristic
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan Test set connection RELÉ I1 CT1 I2 CT2 I3 CT3 I4 CT4 I5 I6
CT5 CT6 TRIP
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
0.522 * sqrt(3) q ( ) = 0.904
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan YY Transformer
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Iop= I1 + I2 Irst= (|I1 | + |I2 |)/k
SEL RELAY Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan DABY Transformer ABC Rotation
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
X Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL ) - 2nd and 5th Harmonic blocking function - Trip p with 2nd and 5th Harmonic - Trip with 2nd Harmonic in one phase - No operation with 5th harmonic in one phase - External fault simulation - Internal fault simulation Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL ) Trip for 2nd Harmonic 3 Phase Test (PCT2 = 15%)
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL ) Trip for 5th Harmonic 3 Phase Test (PCT5 = 35%)
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL ) Internal Fault
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL ) Internal Fault
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL ) External Fault
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.2 Dynamic Tests ( SSIMUL ) External Fault
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.3 Transient Tests ( TRANS – COMTRADE Files ) - 2nd
and 5th Harmonic blocking function - Trip with 2ndd and 5thh Harmonic - Trip with 2nd Harmonic in one phase - No operation with 5th harmonic in one phase - External fault simulation - Internal fault simulation Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.3 Transient Tests 2nd Harmonic - DATC
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.3 Transient Tests 2nd Harmonic – COMTRADE file
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.3 Transient Tests Internal Fault – COMTRADE file
Differential Sensibilization
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
3. Test Plan 3.3 Transient Tests Overexcitation – COMTRADE file
Blocking Enable Differential ff Sensibilization
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
TESTING TRANSFORMER DIFFERENTIAL RELAYS
Doble International Protection Testing Users Group Conference Austin TX – Oct 13 – 14 2010
