P&B can provide direct plug in replacements for almost all MCGG and KCGG relays, The P&B midos connector is compatible to the GEC type and allows the existing case to be reused. Meaning a retrofit involves replacing only the protection relay body and avoiding any changes or alteration to the control wiring side.
The alternative P&B unit can be equipped with modern and multiple communication protocols (RS485 modbus, DNP3, IEC61850), so system enhancements can be undertaken in the speed it takes to withdraw one relay and replace it with another.
P&B have replacement relays available for almost the entire midos range including:
MCGG – Overcurrent & earth fault
MBCI, MCTH, MRTP, MVTW and MFAC – Pilot wire protection
MCAG – Restricted earth fault
MVAW, MVAA, MVAJ – Trip and lockout
MWAX – Trip circuit supervision
METI – Directional blocking
MBCH – Differential protection
MFVU – Under over frequency / Overfluxing
MWTU – Reverse power
MCVG – voltage restrained (or controlled) overcurrent or impendence protection
MCND – Negative phase sequence
MYTU – Field failure protection
MVTU, MVAP, MVAG, MVAS, MVTD, MVTI – voltage balance, check sync, under/over voltage, neutral voltage displacement
MSP-I, MSP-I2, MSP-EF, MSP-EDX, MSP-REF, MSP-V, MSP-UV, MSP-OV
The vision 100 series relays offer the same functionality, form and fit although designed for 3-phase systems provision has been made within the 100 series firmware to turn off unused phases allowing any relay to be used as a replacement for the MSP.
MIRI-E, MIRI-ES, MIRI-I, MIRI-IE, MREF, MRAR, MIRD-T
MIRV-E, MIRV-NVD, MIRV-O, MIRV-U, MIRV-UO, MIRP, MIRD-G
MRI-I, MRI-E, MRI-IE, MRI-ED, MRI-ID, MRI-IED, MRI-V
MRVT, MRRP, MROS, MRNS, MRMF, MRFT, MRFF, MRCS, MRDG, MRVB
The vision 100 series relays offer the same functionality, form and fit, in some cases relays have been design a direct pin for pin equivalents, whilst other relays a modicum of minor terminal repositioning.
When using the drawout chassis, the existing relay electromechanical elements are removed and the vertical Motorvision relay is mounted to newly fitted stirrups, the terminals are then wired directly to the existing contacts of the chassis.
The new relay wired complete to the chassis can be reinserted and put back to service with minimal effort.
P&B is a leading UK innovator of electrical protection, safety and control technologies.
Our specialist expertise and unrivalled experience is relied upon in heavy industries throughout the world to ensure the highest levels of safety and performance.