





RPB5051-MB
Compact three-phase plus neutral overcurrent protection relay with instantaneous (ANSI code 50/50N) and time (ANSI code 51/51N) trip characteristics and MODBUS communication
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Description
The RPB 5051-Mb is a compact three-phase plus neutral overcurrent protection relay with instantaneous (ANSI code 50/50N) and time (ANSI code 51/51N) trip characteristics. Its microprocessor-based design makes it suitable to provide versatile overload and fault protection on 50 Hz or 60 Hz systems and adaptable for a wide range of applications. RPB 5051-Mb provides RMS measure of each phase and neutral, and records information of the last fault.
The RPB 5051-Mb protection relay has two output contacts, each one provided with a NO (normally open), NC (normally close) and COM (common) terminal. Each output contacts’ function can be configured by the user from a range of options (disabled, General trip, Neutral instantaneous…).
The relay also provides 1 digital input whose function can be configured by the user such as Disabled, Trip disable, Trip reset…
1 OBJECT
This manual is intended to help users set up and operate the overcurrent protection relay RPB
5051-Mb.
2 OPERATING PRINCIPLES
The RPB 5051-Mb is a compact three-phase plus neutral overcurrent protection relay with
instantaneous (50) and time (51) trip characteristics. Its microprocessor-based design makes it
suitable to provide versatile overload and fault protection on 50 Hz or 60 Hz systems and
adaptable for a wide range of applications. RPB 5051-Mb provides RMS measure of each phase
and neutral, and records information of the last fault.
Due to its small design, it is ideal for applications and facilities requiring highly compact
equipment. Housed in a 6-Module DIN rail standard enclosure makes it a direct replacement
for existing Arteche RV-IT and RV-ITN relays.
3 RECEPTION & STORAGE
The PB 5051-Mb protection relay is supplied with packaging capable of protecting it during
normal handling for equipment of this type.
If it is not to be installed immediately, it should be kept in the packaging, properly closed and
in indoor conditions, protected from rain, dust, vibration, etc.
If the packaging is damaged or it is believed that the unit may have been incorrectly handled in
transit, the carrier, the relevant insurance company and the manufacturing plant should be
informed forthwith.
Check also that the data on the ID plate matches the order data.
4 OPERATIONAL CHARACTERISTICS
4.1 Protective Functions
The RPB 5051-Mb protection relay features the following protective functions for phase and
neutral:
• Instantaneous unit (ANSI code 50):
o Instantaneous operation.
o Additional time.
• Time unit (ANSI code 51):
o Definite time.
o Operation by IEC standard curves:
▪ Inverse,
▪ Very inverse
▪ Extremely inverse.
• AC Reclosing Relay / Auto Reclose (ANSI code 79)
4.2 Relay setting
The relay can be adjusted:
• Via the display and keyboard on its front (user interface).
• Via Modbus/TCP protocol.
4.1 Digital output contacts
The RPB 5051-Mb protection relay has two output contacts, each one provided with a NO
(normally open), NC (normally close) and COM (common) terminal. Each output contacts’
function can be configured by the user from the following range of options: *(detailed in the manual)
4.1 Digital Input
The relay has 1 digital input whose function can be configured by the user from the following
range of options: *(detailed in the manual)
4.2 Current Inputs
These are powered by an external current transformer which adjusts the primary current to
the secondary measuring current of the relay (see connection diagrams in Section 5). This
instrument transformer should be powerful enough to power the measuring circuit (see
Section 6.1: Technical Specifications). The RBP 5051-Mb overcurrent relay can be connected
directly, with no need for external current transformers, in circuits with rated current levels
coincidental with the relay itself. Maximum current levels are shown in section 6.1 (Technical
Specifications).
4.3 LED Indicator
Apart from the display itself, the RBP 5051-Mb includes a LED indicator fitted in the front
panel, which provides clear annunciation of status: *(detailed in the manual)
When tripping has occurred, the LED remains on flashing state until it is acknowledged
manually or via the digital input or communications.
4.4 Self-Diagnosis
The relay continually checks the status of its own internal components, program cycle
monitoring, power supply, etc. The results of these checks are reflected in the following two
components:
• OK output contact function for relay health monitoring.
• LED indicator.
4.5 Communications
The user can communicate with the protection relay to configure its operational parameters
and check its status. The information communicated is as follows:
• Configuration: adjust & display of settings.
• Measurements: RMS current input levels.
• Internal status: indication of relay functions enabled, and whether they are tripped or
not. The status and configuration of the relay outputs and the digital input are also
shown.
• Last trip: When a trip occurs, the display reads ‘FALT’. The UP/ DOWN keys can be used
to display the currents measured in each phase at when the fault occurred. This
information can also be consulted via the keyboard or through the user interface until
a reset command is given through one of these channels or through the digital input.
Remote Communication Characteristics
• Communications are based on the Modbus-TCP protocol.
• The PC is always the client in communications and the relay acts as the server.
• Communication runs on Ethernet. The physical layer is stablished via the RJ45 port
which is in the front panel.
• The relay must be provided with an IP address, Gateway and Mask parameters
that identify the server. These parameters can be set either manually, by choosing
the Static Mode in configuration, or automatically, by selecting the DHCP Mode. If
DHCP mode is set, modification of the previous parameters is not enabled.
• The relay is also allocated an ID number which can be selected between 1 and 240.
This number identify each relay of a Modbus installation.
Remote communication may be stablished with any Modbus master software. We recommend
using our CESINEL ModbusMaster software.
For a table of the Modbus registers map see Appendix 2
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5 CONNECTION DIAGRAMS
Figure 1 shows a schematic of the RPB 5051-Mb:
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