I want to discuss the how synchronization in done MarkV and MarkVIe. I am not expert in this as I am going to read this first time in DETAIL. Please be patient if I am wrong anywhere.
MarkV
In MarkV three relays are used for Auto/Manual synchronization. These relays reside on TCTG card. These relays are
1. 25 (Auto Synch Relay)
2. 25P (Synch Permissive Relay)
3. 25X (Synch Check Relay)
Although these relays reside on TCTG card, 25P and 25X are actuated (goes to "1") based on the logic in <Q> cores whereas relay 25 is actuated (goes to "1") by the <X>, <Y> and <Z> cores.
For auto synchronization Breaker Coil is connected across terminal 38 and 41 of PTBA card. Breaker voltages are come at PTBA terminal 35 and they will go to terminal 38 through logic in which all the three relays 25, 25P and 25X are in series for auto synchronization. All these three relays must be "1" for auto synchronization. (I will discuss later what logic will make them "1" and for how long they will remain "1".)<pre>
PTBA 35 25 25P 25X PTBA 38
o-----------| |----------| |---------| |----------o--------------------
|
(Breaker coil)
|
o-----------------------------------------------------------------------
PTBA 41</pre>
For Manual Synchronization/ Dead bus breaker closure, Breaker Coil will remain connected across PTBA 38 and 41. We have Manual Synchronization / Dead bus breaker closure wire connected at PTBA terminal 42. The manual breaker closure command will go to the terminal 38 when the Manual Breaker Closure button is pressed and relay 25X is actuated (is "1") at that time.<pre>
PTBA 35 25 25P 25X PTBA 38
o-------------| |-------| |-------------| |---------o--------
| |
(Manual command) PTBA 42 o-------- (Breaker coil)
|
o--------------------------------------------------------------
PTBA 41</pre>
Mark Vie
MarkVIe also has three relays for Auto/Manual synchronization. For MarkVIe these relays reside in TTUR. (MarkV has <P> core with TCTG and 3 TCEA cards (i.e. <X>, <Y>, <Z>). Emergency and Primary trip relays (ETRs and PTRs) were physically present in TCTG card in <P> core. Trip solenoid was connected to TCTG and trip was initiated either ETRs or PTRs were actuated. ETRs received signals from <X>, <Y> and <Z> while PTRs received signals from <R>,<S> and <T>. MarkVIe does not have <P> core. It has four cards for synchronization and tripping. These are TRPG, TREG, TTUR and TPRO. TRPG has all the PTRs and TREG has all the ETRs. Yes, one wire of trip solenoid is connected to TRPG while second wire of trip solenoid is connected to TREG card. I guess TCTG has been replaced with two cards (TRPG and TREG) in Mark Vie. TRPG receives signals from <R>, <S>, <T> controllers via TTUR while TREG receives signals from TPRO(<X>, <Y> and <Z> replaced with TPRO?)
These three relays are
1. 25 (Auto Synch Relay)
2. 25P (Synch Permissive Relay)
3. 25A (Synch Check Relay) {This relay was named as 25X in MarkV}
All these relays reside in TTUR. The breaker coil is also connected to TTUR.
Relay 25P is directly driven from controller application code. It is connected to the <R>, <S> and <T> controllers via IO Packs PTUR.
Relay 25 is driven from PTUR auto synch algorithm, which is managed by <R>, <S>, <T> controllers.
Relay 25A receives signal from TPRO (TPRO is connected to TREG and TREG is connected to TRPG AND TRPG is connected to TTUR).
In MarkV 25X is driven from <R>, <S> and <T> cores and its logic was present in CSP. In MarkVIe they have renamed it to 25A and it is driven from TPRO. It is also called backup synch check relay. Are relays 25P and 25 performing the same function? Were they having the similar function in MarkV as well?
MarkV
In MarkV three relays are used for Auto/Manual synchronization. These relays reside on TCTG card. These relays are
1. 25 (Auto Synch Relay)
2. 25P (Synch Permissive Relay)
3. 25X (Synch Check Relay)
Although these relays reside on TCTG card, 25P and 25X are actuated (goes to "1") based on the logic in <Q> cores whereas relay 25 is actuated (goes to "1") by the <X>, <Y> and <Z> cores.
For auto synchronization Breaker Coil is connected across terminal 38 and 41 of PTBA card. Breaker voltages are come at PTBA terminal 35 and they will go to terminal 38 through logic in which all the three relays 25, 25P and 25X are in series for auto synchronization. All these three relays must be "1" for auto synchronization. (I will discuss later what logic will make them "1" and for how long they will remain "1".)<pre>
PTBA 35 25 25P 25X PTBA 38
o-----------| |----------| |---------| |----------o--------------------
|
(Breaker coil)
|
o-----------------------------------------------------------------------
PTBA 41</pre>
For Manual Synchronization/ Dead bus breaker closure, Breaker Coil will remain connected across PTBA 38 and 41. We have Manual Synchronization / Dead bus breaker closure wire connected at PTBA terminal 42. The manual breaker closure command will go to the terminal 38 when the Manual Breaker Closure button is pressed and relay 25X is actuated (is "1") at that time.<pre>
PTBA 35 25 25P 25X PTBA 38
o-------------| |-------| |-------------| |---------o--------
| |
(Manual command) PTBA 42 o-------- (Breaker coil)
|
o--------------------------------------------------------------
PTBA 41</pre>
Mark Vie
MarkVIe also has three relays for Auto/Manual synchronization. For MarkVIe these relays reside in TTUR. (MarkV has <P> core with TCTG and 3 TCEA cards (i.e. <X>, <Y>, <Z>). Emergency and Primary trip relays (ETRs and PTRs) were physically present in TCTG card in <P> core. Trip solenoid was connected to TCTG and trip was initiated either ETRs or PTRs were actuated. ETRs received signals from <X>, <Y> and <Z> while PTRs received signals from <R>,<S> and <T>. MarkVIe does not have <P> core. It has four cards for synchronization and tripping. These are TRPG, TREG, TTUR and TPRO. TRPG has all the PTRs and TREG has all the ETRs. Yes, one wire of trip solenoid is connected to TRPG while second wire of trip solenoid is connected to TREG card. I guess TCTG has been replaced with two cards (TRPG and TREG) in Mark Vie. TRPG receives signals from <R>, <S>, <T> controllers via TTUR while TREG receives signals from TPRO(<X>, <Y> and <Z> replaced with TPRO?)
These three relays are
1. 25 (Auto Synch Relay)
2. 25P (Synch Permissive Relay)
3. 25A (Synch Check Relay) {This relay was named as 25X in MarkV}
All these relays reside in TTUR. The breaker coil is also connected to TTUR.
Relay 25P is directly driven from controller application code. It is connected to the <R>, <S> and <T> controllers via IO Packs PTUR.
Relay 25 is driven from PTUR auto synch algorithm, which is managed by <R>, <S>, <T> controllers.
Relay 25A receives signal from TPRO (TPRO is connected to TREG and TREG is connected to TRPG AND TRPG is connected to TTUR).
In MarkV 25X is driven from <R>, <S> and <T> cores and its logic was present in CSP. In MarkVIe they have renamed it to 25A and it is driven from TPRO. It is also called backup synch check relay. Are relays 25P and 25 performing the same function? Were they having the similar function in MarkV as well?