MiCOM P123R Overcurrent Relays

MiCOM P123R ADDENDUM: MiCOM P12x UPDATE DOCUMENTATION

The MiCOM P123R is a new overcurrent protection relay from the MiCOM P12x range, designed as a cost-effective solution for retrofitting KCGG122 and KCGG142 relays. It shares the same firmware as the standard MiCOM P123, offering identical software features. The primary difference is mechanical, with re-assigned internal digital input/output terminals for easier retrofit. While the MiCOM P123R offers only 5 logic inputs compared to 8 in KCGG142 01 relays, and one watchdog contact (NC) instead of two (NC and NO) in KCGG122 & 142 relays, it fully supports the protective functions of its predecessors and offers additional functionalities. This document supplements the MiCOM P123 Technical Manual.

The following table outlines the relationship between this addendum and the P12x Technical Manual chapters:

P12x/EN IT/Eb6: Introduction

Evolutions from KCGG122 & 142 to MiCOM P123R

The KCGG122 & 142 protective functions are fully supported by the MiCOM P123R relay. The following sections highlight the key differences between the two products.

Main characteristics

P12x/EN TD/Eb6 : Technical Data

Information required with order (MiCOM P123R)

(1) Unless specified, the latest version will be delivered.

P12x/EN IN/Eb6 : Installation

Important Safety Information: Before performing any work on the equipment, the user must be familiar with the contents of the Safety Guide SFTY/4LM/E11 (or later issue), the Safety and Technical Data sections of the Technical Manual, and the ratings on the equipment rating label.

Retrofit of KCGG122 or 142 relays

Step 1: Identify CT Ratio
IDENTIFY IF THE CURRENT CIRCUIT CT RATIO IS 1 A OR 5 A. SELECT THE MICOM P123R RELAY ACCORDINGLY.

Deposit of KCGG122 or 142 relays

The steps to replace a KCGG122 or 142 with a MiCOM P123R are described below. Extract all settings from the KCGG relay before switching off and ensure they are reported in the MiCOM P123R or updated if necessary.

1. Switch off the existing KCGG122 or 142 relay. Isolate the current, power supply, and tripping circuits, including CBF initiations and intertrip signals, if any.
2. If necessary, remove the cover. Unscrew the upper and lower screw.
3. Withdraw the KCGG122 or 142 active part by pulling the lower and upper handles.
4. Disconnect the two rear side terminal blocks (2). Unscrew and remove the 4 retaining screws (1) (S/TAP screws Nr 2 × 1½ per block - Pozidrive screwdriver Nr 0).
5. Unscrew the case retaining screws, pull the case, and remove it.

Note: If necessary, unscrew the two screws (3) retaining the middle plate to facilitate the removal of the terminal block (S/TAP screws Nr 4 × 1/4).

MiCOM P123R assembly

Note: The P123R is provided with the same terminal block arrangement as the KCGG relay. It is recommended to energize this relay, set it accordingly, and test it "on the table".

Withdraw the active module part of the MiCOM P123R relay (see section P12x/EN GS) from its case, and remove the two terminal blocks as explained in the previous lines.

1. Place the MiCOM P123R case and screw the retaining screws.
2. Fix the terminal blocks in the MiCOM P123R case after inverting their position from left to right. Screw the same retaining screws and fix the earth connecting plate.
3. Move the K-Bus communication terminals as follows:
   - Terminal 54 to pin 9,
   - Terminal 56 to pins 10 and 1 (earth).
4. Fit the active part of the MiCOM P123R and screw the four retaining screws to the case. Close the top and lower hinged covers.

P12x/EN FT/Eb6 : User Guide

1.4 Displays of Alarm & Warning Messages

1.4.2 Relay Hardware or Software Warning Messages

The watchdog of the MiCOM P123R is a normally closed contacts relay (terminals 3-5), instead of a change-over contacts relay. If an internal hardware or software failure occurs, the MiCOM P123R closes its watchdog contact.

Alarm and Warning messages operation is identical to other MiCOM P12x devices; only normally open contacts are not used.

3 Wiring

The MiCOM P123R relay has the same terminal layout for common elements. Terminals numbers are inverted: terminals 1 to 28 are on the right side of the relay (view from the rear), and terminals 29 to 56 are on the left side. The wiring diagram is provided in this addendum.

3.1 Auxiliary supply

The auxiliary power supply for the MiCOM P123R relays can be either direct current (24-250 Vdc) or alternating current (48-240 Vac / 50-60 Hz). The auxiliary power supply must be connected only to terminals 13 (+) and 14 (−).

3.5 Communication

3.5.1 RS485 rear communication port

The MiCOM P123R terminals 9 and 10 are dedicated to the RS485 communication port. For retrofitting KCGG122 & 142 relays, if the RS485 rear communication port is used, connect a wire from terminal 54 to pin 9 and a wire from terminal 56 to pin 10.

P12x/EN GS/Eb6 : Getting Started

1.2 Auxiliary Power Supply Connections

Connect a DC or AC voltage power supply (according to nominal supply rating Ua).

POSITIVE Vaux to TERMINAL 13
NEGATIVE Vaux to TERMINAL 14

3 LOCAL CONNECTION TO A PC

3.2 Products plugged in the same panel

The connection principle for plugging a MiCOM P123R into another product in the same panel is identical to other MiCOM P12x relays. The MiCOM P123R earth terminal pin number is 1:

• A cable (green / yellow wire) must be screwed to the earth connection of each product.
• The communication cable shield must be connected to pin number 1 of each product.
• The pin number 1 of each terminal block must be connected and screwed to the case earth connection of each product.

3.3 Communication between distant products

The connection principle for plugging a MiCOM P123R to distant products is identical to other MiCOM P12x relays. The MiCOM P123R earth terminal pin number is 1:

• A cable (green / yellow wire) must be screwed to the earth connection of each product.
• The communication cable shield must be connected to the pin number 1 of each product.
• The pin number 1 of each terminal block must be connected and screwed to the case earth connection of each product.

P12x/EN CM/Eb6 : Commissioning and Maintenance

3 Product verification tests

3.7 Auxiliary supply

Check the auxiliary supply voltage (terminals 13 and 14). The measured value should be between 0.8 and 1.2 times the DC nominal auxiliary supply voltage, or 0.8 and 1.1 times the AC nominal auxiliary supply voltage.

3.8 Logic inputs

The MiCOM P123R relays have 5 opto-isolated inputs. Terminal 52 is the common (–) pin for opto-isolated inputs L1 and L2, connected to pins 46 and 48 (+) respectively. Terminal 55 is the common (–) pin for opto-isolated inputs L3 to L5, connected to pins 45, 47, and 49 (+) respectively.

3.9 Logic outputs

The MiCOM P123R relays have 9 outputs. The watchdog output is a normally closed relay (WD, terminals 3-5). The RL1 to RL8 logic output relays are normally open (NO) relays.

4 Setting checks

MiCOM P123R RELAYS HAVE 1 OR 5 AMP CURRENT INPUTS (depending on the model: refer to the label under the upper flap). CHECK THAT THE INJECTED CURRENT IS COMPATIBLE WITH THE SELECTED RANGE.

4.3 Phase overcurrent (I> and I>>)

This test wiring diagram allows for tests related to the I> and I>> thresholds. The diagram shows current injection onto the 1 or 5 Amp phase current inputs (terminals 21-22, 23-24, 25-26).

INJECTION TEST SET

FIGURE 4: I> AND I>> TESTS WIRING

5 Maintenance

5.2 & 5.3 Minor or major fault

A communication failure is considered a minor fault for MiCOM P123R relays. In case of communication fault, the MiCOM P123R protection and automation modules are unaffected, and the relay remains fully operational. The watchdog relay is energized (3-5 contact open).

Major faults for MiCOM P123R relays include all software and hardware failures except communication faults. Upon detection of a major fault, the watchdog (WD) is de-energized (3-5 contact closed), and all operations (protection, automation, communication) are stopped.

P12x/EN CO/Eb6: Connection Diagram

Diagrams illustrating connection schemes for the MiCOM P123R relay.

Note on CT connections: CT connections are typical. CT shorting links make before (b) and disconnect (c). Long terminals (a), short terminals (b) break before (c). Pin terminals are PCB type (d).

Note on Earth terminals: Earth terminals are typical.

Advice for Connection:

• A tightening torque of 1.3 Newton-metres is recommended for all screws fitted to the MIDOS terminal blocks.
• Functioning temperature is limited to 55°C.
• For any connection, use the provided kit or use cable terminals UL LISTED.
• Wiring: use copper conductors only, size AWG22 to AWG10.

Schneider Electric Contact Information

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92506 Rueil-Malmaison
FRANCE

Phone: +33 (0) 1 41 29 70 00
Fax: +33 (0) 1 41 29 71 00

www.schneider-electric.com

Publication: P123R/EN AD/A11

Publishing: Schneider Electric
09/2012

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