The P&B Golds relay was regarded by many as the finest motor protection relay ever made. Almost 500,000 were manufactured and supplied around the world from the late 1940s through to 1980’s.
Several enclosure type were available; draw out cases using the GEC format, the popular square format, horizontal and vertical flush mount non-withdrawable types. Typically the larger the case the more additional flags indicator and element the relay was equipped with.
Although a vast number of Golds relays still operating and in service today many end users are looking to upgrade their protection to enhance their systems with communicating features, event recording as well as integrating other protective functions.
For most of the P&B Golds relays we can provide a direct replacement which provides motor overload and earth or overcurrent and earth fault protection using a vertically mounted Motorvision or Feedervision relay. In addition all of the normal protective functions found within our modern relays are available to make use of.
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 Golds chassis. The flag reset plunger now even makes contact with a convenient reset switch.
The new relay wired complete to the chassis can be reinserted and put back to service with minimal effort.
The 2000 relay was used extensively for the protection and or control of medium voltage motors, typically 415V, 3.3kV, 6.6kV and 11kV. Quite often this protection relay was fitted to GEC (Alstom) HMC1072/1172 Switchgear, Baldwin and Francis Equipment, Elequip and Igranic auto transformer circuits both for onshore and offshore applications.
This relay is based upon the Motorvision design and is mounted within a 192x96mm case and comes complete with an adaptor plate to mount neatly within the original relay cut-out.
The new terminals replicate that of the existing relay, although as the terminals were a mix of both screw and plug in type, there are some reconnections to be made to the new relay. The new relay protrudes from the switchgear door by 44mm, improving overall aesthetics by mounting flush alongside the likes of other door mounted equipment, such as MMLG01 test blocks. The installation is fast and aided by pre-configuration of the digital I/O.
50x50mm Graphical LCD with start curve capture
17x Digital inputs
4x Changeover contact relay outputs
5x RTC/PTC/NTC 3 wire inputs
4x CT inputs 1A or 5A (3ph + 1EF)
3x VT Inputs 100-500V ac nominal
Aux supply 80-265V ac/dc or low voltage 24-70V ac/dc
Mini USB front port
The existing bezel mounted push button will even align with the fault reset/display scroll prompt key of the new relay module.
The 3000 can also be provided with its casing for use in new projects or extensions.
The new MPR3E5 module is pin or pin compatible and fits directly into the existing MPR3E5 case within the switchgear panel.
This allows the old 3E5 to be swapped directly for a new 3E5 without the need for any wiring alterations.
These relays were the first of a range of early static and microprocessor based relays for overcurrent, earth fault and motor protection relays.
The retrofit solution is based on a Motorvision design and the ordering code of the retrofit is prefixed with the existing relays’ nomenclature; N11Retrofit, 120Retrofit etc, followed by its secondary CT rating. N11Retrofit-1A
The relay is vertically mounted and fitted within a chassis that match the mechanical format of the existing switchgear aperture. The relay terminals are pre-wired to similar terminals to the original relay.
The retrofit process is extremely fast and is simply to remove the existing wiring from the back of the relay and remove the unit completely. The new relay is fitted into the aperture and secured in place, the control cabling is then re-terminated in the same positions.
PBSJ -1A, PBSJ-1B, PBSJ-3C, PBSJ-1D, PBSJ-3D, PBSS -1F, PBSS-1B, PBSS-1K, PBSU -1F, PBSU-3F, PBSU-1G, PBSU-1K, PBSU-1H, PBSD-3A, PBSD-3G, PBSF-1G, PBSP-1G, PBSX-1G, PBSY-2G, PBSZ-3A, PBSN-1F, PBSN-2F, PBSN-3C, PBSR-3X, PBSR-1X, PBSU-1A
These relays were the first of a range of early static and microprocessor based relays for overcurrent, earth fault and voltage protection.
The retrofit method exactly follows that of the P&B PBSJ and PBSM unit.
With equipment support from S&I now limited to exchanging the entire starter drawer P&B have created a direct replacement based on the Motorvision design.
The MM5 retrofit occupies the same position as the mm5 relay making use of the existing fixing location and allows connection to the existing cabling loom without any changes required. Furthermore the CT inputs used with Motorvision have been altered in the retrofit design to provide a direct method of connection of the installed S&I CT module to the MM5 retrofit.
The remote display is removed and depending upon the specific Eurocentre drawer style the MM5 retrofit display is supplied complete with either a steel adaptor plate (for the LHS mounted version) or ABS adaptor plate (for the RHS mounted version) which is needed to carry the new P&B retrofit display.
The MM5 retrofit allows end users to continue the usable life of their S&I switchgear by providing forward support and serviceability.
In instances were MM5 is connected to a RS485 network via a CMAC unit P&B can configure the retrofit to mimic the data points of the MM5, or the CMAC itself can be exchanged for a P&B Xcell Data Concentrator.
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.