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  1. warickwrx

    Minimizing overeaching in Impedance relays by limiting restive reach

    Hi I am looking for some information and perhaps reasons why one would use the following criterion to limit restive reaches to mitigate overreaching in an Impedance relay's For earth faults the resistive Zone 1 reach is limited by 4.5 <= X1 For phase-to-phase resistive reach of Zine 1 is...
  2. warickwrx

    Transformer Short Circuit Impedance (3 phase transformer , 1 phase test supply)

    ...H3 and H1), with the test current adjusted to the same level for each reading. Then the %Z of the three-phase transformer is given by Z% = 1/60 * [( E12 + E23 + E31)/Im ] * [3 ph Kva / (Vline * Vline] E12, E23, E31 are measured test voltages Im is the current mesurement (not sure if this...
  3. warickwrx

    Similar - Zero Sequence Mutual Coupling (ZSMC)

    Hi Thanks for the paper interesting reading, however still I am still a little confused. I am essentially trying to prove that mutual induction is in fact taking place between these two parallel lines what would be the best method to follow to to prove this ?
  4. warickwrx

    Similar - Zero Sequence Mutual Coupling (ZSMC)

    I see a closed thread from an earlier date, which reads as follows: " CDG16 (Electrical)(OP)20 Jan 05 23:31 We have two 132kV lines on the same towers for about 100km. In the past we have used a portable transformer and generator to test ZSMC on parallel lines by injecting around 140A on the...
  5. warickwrx

    Steam Quality vs Pressure

    Hi regarding the following two pints 1. "the quality factor of the steam" and secondly 2. " the vapor fraction of the steam " They are two entirely different physical characteristics. Could someone perhaps explain the difference ?
  6. warickwrx

    Steam Quality vs Pressure

    I checked the steam quality cals for increasing it is 93% and decresing is 97%, I am try to verify if this is acttually valid. I am not sure if I am calculation the enthalapies correctly, for example if the pressure inside (p1) the vessel is 8 bar, I use the hl (enthalapy of saturated liquid...
  7. warickwrx

    Steam Quality vs Pressure

    I used the armfield TH3 apparatus to conduct the experiment, you measure pressure and tempreture inside the vessel, and then throttle and measure outlet tempreture I would assume at atmospheric pressure. I attached a picture of the setup...
  8. warickwrx

    Steam Quality vs Pressure

    Hi All After conducted a throttling experiment with water and noting the results. I would like to verify if it they make sense. What I noticed as that when the pressure inside the sealed vessel increased from say 1 to 7 bar in 1 bar increments the quality factor of the steam remained fairly...
  9. warickwrx

    basic clutch plate theory uniform wear

    I have some theoretical questions about clutches that I would like some clarity on, I have answered them and would just like to check my understanding. 1. what is the relationship between frictional torque and axial load. it is proportional ie linear as axial load increases so does frictional...
  10. warickwrx

    Old Relays

    Yes I have, we used an Omicron aswell, However it can be quite a challenge depending on the relay Burden and test set VA rating
  11. warickwrx

    Old Relays

    Hi, For interest sake what test set are you using to secondary injection test the LZ32 with ?
  12. warickwrx

    Teleprotection X.21. Newbridge BME test requirements

    Good Day Is anyone familiar or has experience with test requirements for the telecommunication circuitry that would link to sites. The protection relays at the two sites are linked via a Newbridge BME Multiplexer device using radio as a communications medium. I wish to know from a...
  13. warickwrx

    Differential test plan for P632

    Hi Have you tried to contact doble ? I would assume they should provide you support for this type of problem if you have purchased their test equipment. Ideally like you said you need to understand how they derive their bias characteristic in both the relay and test set software. Personally I...
  14. warickwrx

    Harmonic Currents in a Capacitor Bank

    Some other things to perhaps consider I would also check on the filtering capabilities of the protection relays. This should not be really be a concern with modern numerical relays but can pose a problem with older static type relays that may be using basic filtering techniques. Secondly I not...
  15. warickwrx

    ABB REF615 Firmware Upgrade

    Hi I am having problems while attempting to upgrade the firmware on this device. The upgrade appears to work as the version on the relay changes to the latest version but PCM600 indicates that the upgrade has failed. Any ideas ?
  16. warickwrx

    YNd6 - phase shift

    Hi all Just a speculative question, why can we not get a YNd6 vector group transformer. Is it because of the limb design and winding process used in YNd type transformers.
  17. warickwrx

    ABB REF615 IED

    Hi I would like to know if anyone knows what the default password is for this device, and secondly if it needs to be set to use the webpage interface from the front port. I turned on the setting under the HMI menu however it still does not display the WHMI. Any experiences ?
  18. warickwrx

    Legacy Protection Relay &quot; GEC OPTIMHO LFZP 112 &quot;

    Gooday All I have this spesific relay "GEC OPTIMHO LFZP 112" on my network which uses an old piece of setting software called opticom, I would like to know if anyone is aware of newer software that will work with this relay and if it is windows based and what communication cable is required. I...
  19. warickwrx

    serial to ethernet encapsulation drivers

    I am already performing the connection to the device via a serial server using tcp and psuedo serial comms ports. At this stage I am just investigating the possibility of another option using the method described . I will do some more exploring.
  20. warickwrx

    serial to ethernet encapsulation drivers

    Hi I am trying to understand the concept of serial to ethernet encapsulation. I can appreciate that the serial comms suite can be packaged within a TCP packet and sent across a network and will be unpacked at the remote TCP ip device back to serial. But I suppose my real question regards...

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