Digital Modules for MicroLogic X Control Units

This Energy per Phase digital module calculates and displays the active, reactive and apparent energy per phase of the power system network at the point of measurement.

It also provides the total active, reactive and apparent energy per phase.This module can be installed on a 4-pole MasterPacT MTZ device or a 3-pole with the neutral connected to the VN terminal and ENVT; for 3P4W, wye configurations.*

Benefits

Monitors energy per phase when there are unbalanced loads in low voltage installations, or when different usages or tenants are supplied on each phase.

Individual Harmonics Analysis digital modules provide harmonics of voltage and current to the 40th harmonic. Individual harmonics are calculated every 200 ms Values are calculated as specified in IEC 61000–4–30 (Testing and measurement techniques - Power quality measurement methods).*. The average values of the individual harmonics are calculated over a time period of 3 s.

The instantaneous effects of harmonics include:

• Disturbance of the operation of power electronics equipment.

• Generation of pulsating mechanical torques, vibrations, and noise in asynchronous motors.

• Additional measurement errors in metering devices.

• Interference on communication and control circuits.

The long-term effects include:

• Additional losses and heating in power transformers, rotating machines, capacitors, and power cables.

• Mechanical fatigue and premature aging of motors.

• Degradation of the performance of electrical installations.

• Degradation in the energy efficiency due to increased losses.

• Premature aging and oversizing of the electrical equipment.

The total voltage harmonic distortion (THDV) limits are These values are taken into account by EMC standard IEC 61000-2-4.*:

• THDV < 5%: Insignificant deformation of the voltage waveform: No significant risk to equipment.

• 5% < THDV < 8%: Significant deformation of the voltage waveform: Risk of over-heating and equipment problems.

• THDV > 8%: Major deformation of the voltage waveform. High risk to equipment if installation has not been specifically sized for the distortion.

Benefits

Individual harmonics are displayed on a smart device and can be shared by text or e-mail for remote data analysis by off-site experts, such as Schneider Electric Services.

Real-time monitoring of harmonic pollution enables appropriate decisions to be made when unacceptable levels are reached:

• Deeper investigation, based on measurements and recordings.

• Dedicated studies.

• Installation of passive filters.

• Installation of active filters.

The Power Restoration Assistant digital module displays available events and circuit breaker information. This helps the operator determine potential causes of the event such as: opening, manual or electrical trip or loss of power. It also provides guidance for potential solutions to restore power.

Benefit

This module helps reduce circuit breaker downtime after the circuit breaker trips, opens, or there is a loss of upstream power supply by providing guidance based on all collected information to assist in power restoration efforts.

The MasterPacT Operation Assistant digital module assists in closing or opening the circuit breaker remotely with Bluetooth by delivering applicable instructions such as reset circuit breaker or charge the mechanism. It displays circuit breaker status such as: Ready to close, coil status or spring status.

The full benefit of this function is given with the diagnostic and communication shunt trip, undervoltage release, and shunt close (MX, MN, and XF diag&com).

Benefits

This module allows smart device closing and opening of the circuit breaker, from a safe distance, outside of the arc flash zone. It may reduce the need for Personal Protective Equipment (PPE) level during opening/closing of the circuit breaker.

The Waveform Capture on Trip Event digital module automatically logs five cycles of phase and neutral currents, with a sampling period of 512 microseconds, which is valuable data for diagnosing a trip event. The record can be retrieved with a smartphone or through Ecoreach software (Comtrade format). In addition, the waveform capture function records the circuit breaker status (open/close/trip) and the ZSI out signal. The five cycles of the waveform capture include one cycle before the trip event and four cycles after.

Benefits

Use the automated recording of the waveform image to help analyze a trip event in detail. At a glance, the nature of the trip event can be viewed and understood, displaying the severity of the trip event (with amplitude and duration) and can help identify the potential damage to a facility. Digital signals, like fault-trip indication contact (SDE) / Open / Zone Selective Interlocking (ZSI) support the analysis of the circuit breaker behavior in the power system (i.e. response time, selectivity). Throughout the trip event recording, scrolling in or out adjusts the time period being viewed.

The Modbus Legacy Dataset is compatible with the dataset format of the MicroLogic control unit of MasterPacT NT/NW devices.

MasterPacT MTZ circuit breakers provide standard format Modbus registers.

Supervision software for MasterPacT NT/NW circuit breakers uses Modbus drivers that are compatible with legacy format Modbus registers.

This dataset can be used by existing Modbus drivers running supervision software designed for MasterPacT NT/NW and MasterPacT MTZ circuit breakers avoiding any modification in the supervision software.

The Modbus dataset collects information for remote supervision software in one convenient Modbus table (starting at register 12000 for the legacy dataset, starting at register 32000 for the standard dataset). This table contains the following information:

• Circuit breaker status

• Tripping causes

• Real time values (current, voltage, power, energy…)

The user can get the information contained in this table with only two read requests.

Benefits

The Modbus legacy dataset digital module activates the legacy Modbus registers in the MTZ circuit breaker and allows the system integrator to use the existing Modbus driver within the supervision software.

It allows easy integration in existing installations where modification of supervision software for MTZ circuit breakers is not desired.

IEC 61850 is an Ethernet-based protocol designed for electrical substations. It is a standardized method of communications, developed to support integrated systems composed of multi-vendor, self-describing IEDs (Intelligent Electronic Device) that are networked together to perform monitoring, metering, real-time protection and control. IEC 61850 is gaining wide adoption in Critical application such as O&G, data centers. Thanks to the IEC 61850 digital module, MasterPacT MTZ natively fits into such systems.

Description

The IEC 61850 for MasterPacT MTZ digital module provides MasterPacT MTZ circuit breaker data over ethernet network in conformance with IEC 61850 MMS communication protocol. The installation of this digital module on MicroLogic X control unit will automatically enable IEC 61850 MMS communication protocol on IFE or EIFE communication interface in addition to existing Modbus TCP/IP protocol.

The MasterPacT MTZ circuit breaker data are:

• class 1 energy metering

• electrical measurements

• status

• control.

Benefits

The IEC 61850 MMS (Manufacturing Message Specification) communication protocol helps integrating Low Voltage circuits breakers in Medium Voltage installation without the need of additional gateway. Communication of Low Voltage circuit breakers data (class 1 energy metering data, electrical measurements, status and control) to IEC 61850 supervision systems (EcoStruxure Substation Operation based on PACiS technology) become smooth and easy. IEC 61850 for MasterPacT digital module supports IEC61850 Edition 2 protocol and provides the following logical nodes:

The Under/Over Voltage Protection digital module monitors the circuit breaker voltages and trips when the voltage exceeds the settings.

The voltage in electrical installations must be maintained between a minimum value and a maximum value, generally the rated operating voltage ±10%. Beyond these limits the operation and performance of the loads may be impacted. Under/Over Voltage Protection monitors the system voltage so that if the voltage level of an installation goes out of its acceptable limits, appropriate action can be taken.

Description

This module monitors the voltages V12, V23, V31 or V1N, V2N, V3N, and trips the circuit breaker if the voltage exceeds the settings. For ANSI 27-1 and 59-1 the protection activates when one of the three monitored voltages reaches the designated upper or lower limit. For ANSI 27-2 and 59-2 the protection activates when all the three monitored voltages reaches the designated upper or lower limits.

For each undervoltage protection, ANSI code 7, and over voltage protection, ANSI code 59, the user can choose to monitor either the three phase-to-phase voltages V12, V23, V31, or the three phase-to-neutral voltages V1N, V2N, V3N.

The selection applies for both undervoltage and over voltage protections. It is not possible to select phase-to-phase voltages for undervoltage monitoring and phase-to-neutral voltages for over voltage monitoring and vice versa. Under and over voltage protections operate according to a definite time characteristic. One adjustable time-delay is associated to each of the four elements. The time-delay starts as soon as the protection picks up. Each element generates the start, operate and trip events (see MicroLogic X Optional Protection Modules) . When the undervoltage protection is set in tripping mode, the voltage measurement must be performed on the power source side to allow the circuit breaker closing. Standard installation has the MicroLogic X control unit voltage input directly connected to the internal pickup voltage on the bottom side of the circuit breaker.

Consequently:

• If the circuit breaker is bottom-fed, the internal pickup voltage is suitable for undervoltage protection and circuit breaker closing.

• If the circuit breaker is top-fed, an external voltage input is required. The PTE option must be selected to perform the voltage measurement on the power source side.

The protection trips when:

• the value of voltage exceeds the setting.

• the associated timer is elapsed.

Benefits

The information is used to generate alarms and, when required, open the circuit breaker.

The Undervoltage/Over voltage Protection digital module is suitable for generator protection.

The permanent monitoring of phase-to-phase or phase-to-neutral voltages enables appropriate action to be initiated to safeguard the operation of the installation during abnormal or critical situations, for example: load shedding, source change-over, and emergency generator starting.

The frequency in electrical installations must be maintained within accepted operating levels to minimize the risk of damage to motor loads, sensitive electronics, and to ensure the proper operation and performance of all loads. Generally, the allowed rated operating range of frequency is ±10 %. The ANSI 81- Under/Over frequency protection digital module allows the frequency to be continuously monitored. If the frequency level of an installation goes out of its acceptable limits, the information delivered by this digital module can be used to initiate appropriate action to restore good operating conditions in the installation.

Description

The ANSI 81 – Under/Over frequency protection digital module is used to generate either an alarm or a trip. There are two independent protections: underfrequency (ANSI 81U) and overfrequency (ANSI 81O). The protection picks up when the frequency reaches its upper or lower limit. Underfrequency and overfrequency protections operate according to a definite time characteristic. One adjustable time-delay is associated to each protection. The time-delay starts as soon as the protection picks up. Each protection generates the start, operate and trip events as described in the table above. When the underfrequency protection is set in trip action, the voltage measurement must be performed on the power source side to allow the circuit breaker closing. As standard, the MicroLogic X voltage input is directly connected to the internal pickup voltage on the bottom side of the circuit breaker.

Details of required power connections:

• if the circuit breaker is bottom-fed, the internal pickup voltage is suitable for underfrequency protection and circuit breaker closing.

• if the circuit breaker is top-fed, an external voltage input is required. The PTE option must be selected to perform the voltage measurement on the power source side.

The protection trips if all below conditions are met:

• the value of frequency exceeds the setting

• the associated timer is elapsed.

Benefits

Underfrequency and overfrequency protections are suitable for generator use. The continuous monitoring of frequency enables appropriate action to be initiated to safeguard the operation of the installation during abnormal or critical situations, for example: load shedding, source change-over, and emergency generator starting.

The Reverse Active Power Protection digital module monitors the active power.

Two-way protection based on calculated active power for the following applications:

• Active power protection to detect overloads and allow load shedding.

• Reverse active power protection:

  • To protect against generators running like motors when the generators consume active power.

  • To protect against motors running like generators when the motors supply active power.

The positive sign of the active power is defined by the setting, and the same sign is used for active power measurement. By default the MicroLogic X control unit assigns the sign + to the active power when the power supply feeding the installation is connected to the top of the circuit breaker (top-fed circuit breaker).

The sign – is assigned when the power supply is connected to the bottom of the circuit breaker (bottom- fed circuit breaker). In these cases, the sign assigned by default (power sign parameter) must be changed with Ecoreach software.

The protection trips when:

• The active power is negative.

• The value of active power exceeds the setting.

• The timer is elapsed.

The recommended settings are 2 to 6% of the rated power for turbines and 8 to 15% for diesel engines.

Benefits

This module monitors the mode of operation of a synchronous power generator connected to an external network or running in parallel with other generators. It trips the circuit breaker if the generator is back fed. It also monitors the active power exchange between separate parts of an electrical network, and will trip should there be an issue with the direction of electrical flow.

• Monitoring of the mode of operation of a synchronous power generator connected to an external network or running in parallel with other generators.

• Tripping as soon as the generator operates as a synchronous motor, driving its prime mover.

• Monitoring of the active power exchanged between separate parts of an electrical network.

The ANSI 49RMS/51 long-time overcurrent protection is provided as standard with any type of MicroLogic X control unit. This long time overcurrent protection meets the IEC 60947-2 standard and covers long time overcurrent selectivity for most electrical distribution applications. However, with some upstream protection device such as medium voltage fuse, it does not cover long time overcurrent selectivity. By selecting another shape of long time tripping curve such as an IDMTL (Inverse Definite Minimum Time Lag) tripping curve, it may be possible to achieve such selectivity.

Description

The ANSI 51 – IDMTL overcurrent protection Digital Module is used to generate either an alarm or a trip.

This digital module provides overcurrent protection based on one of the selected IDMTL tripping curves:

• DT: Definite Time (time-independant characteristics)

• SIT: Standard Inverse Time curve (I^0.02t)

• VIT: Very Inverse Time curve (It)

• EIT: Extremely Inverse Time curve (I²t)

• HVF: High Voltage Fuse curve (I⁴t)

IDMTL Overcurrent Protection (ANSI 51) is based on the true RMS current. This protection is implemented independently for each phase and the neutral. This protection is an overcurrent time dependent protection (except when Definite Time has been selected).

IDMTL overcurrent protection (ANSI 51) has definite time characteristics described page B-12. The protection generates the start, operate and trip events as described page C-4.

The protection trips if all below conditions are met:

• the value of the current exceeds 1.05 x IDMTL Ir setting

• the timer (IDMTL tr) is elapsed (timer value is given for an overload of
  6 x IDMTL Ir).

Benefits

The addition of one of the IDMTL tripping curves to the existing long-time overcurrent protection may facilitate the selectivity with an upstream protection device.

• Selectivity with an upstream low voltage protection relay where the long time protection is set at very low level by using SIT or VIT tripping curves.

• Selectivity with upstream fuses (High Voltage Fuse) by using HVF tripping curve.

• Protection with certain types of loads where the level of short circuit is very low by using DT tripping curve.

For low voltage installation with multiple power sources running in parallel, the standard overcurrent protection is insufficient to achieve selectivity. In the example below, in case of short circuit on the transformer side, without the directional overcurrent protection, both circuit breaker will trip and therefore the busbar is no more powered. With the directional overcurrent protection, it is possible to achieve selectivity thanks to the detection of the direction of the short circuit and therefore the busbar will keep powered.

Description

The directional overcurrent protection (ANSI 67) Digital Module is used to generate either an alarm or a trip. There are two independant protections : reverse direction overcurrent and forward direction overcurrent. Per convention, reverse direction is given for an overcurrent flowing from the bottom connection to the top connection of the MasterPacT MTZ. Forward direction is given for an overcurrent flowing from the top connection to the bottom connection of the MasterPact MTZ. Directional overcurrent protection detects the direction of the short-circuit current and is an overcurrent time-independent protection.

The Directional overcurrent protection requires the MicroLogic X control unit to be supplied by an external 24 V dc power supply. The protection generates the start, operate and trip events as described page C-4.

The protection trips if all below conditions are met:

• the value of the current exceeds the setting (Ifw or Irv)

• the associated timer (tifw or tirv) is elapsed

• The direction of the short-circuit current is detected:

  • from the top connection to the bottom connection of the circuit breaker: forward directional overcurrent protection trips

  • from the bottom connection to the top connection of the circuit breaker: reverse directional overcurrent protection trips

Benefits

Avoid black-out in case of short circuit on the source side in low voltage installation with multiple power sources running in parallel.

Avoid black-out in case of short circuit on the bus bar side in low voltage installation with multiple power sources running in parallel and with a bus tie.

The Ground-Fault Alarm digital module provides an integrated ground fault alarm.

A phase-to-ground fault can be the result of the slow degradation of an insulating component of electrical equipment or the presence of a foreign body inside the equipment. For such events the fault resistance can be significantly high, enough to maintain the ground-fault current below the settings of the phase-to-ground fault protections. No tripping occurs and the installation remains energized with a potential risk of local overheating and damage. The ground-fault alarm with appropriate settings can pick up such critical resistive ground faults, allowing the maintenance staff to take appropriate actions.

The module operates using the same sensors as the ground-fault protection.

The alarms are independent from the ground fault trip protections and have their own settings. The ground-fault alarm can be used with MicroLogic 3.0 X, 5.0 X, 6.0 X.

When the ground-fault alarm digital module is installed in the MicroLogic X control unit, the ground-fault alarm is automatically activated.

The ground fault current is detected in two ways:

• By summation of either the three phase currents or the three phase currents and the neutral.

• By means of the external sensor SGR installed on the link connecting the ground to the neutral point of the power transformer feeding the installation. The SGR sensor must be connected to the MicroLogic X control unit through the MDGF interface module.

Benefits

The ground fault alarm digital module allows early detection of resistive ground current by detecting gradually increasing ground currents up to the settings of the phase-to-ground fault protections.

The alarms allow the maintenance staff to take appropriate action at the right time in order to safeguard the installation.

Description

The ERMS—Energy Reducing Maintenance Settings digital module is used to lower the protection settings in order for the MasterPacT MTZ circuit breaker to trip faster. Should an internal arc fault occur downstream to the circuit breaker, the reduced fault clearing time decreases the amount of energy generated by the electrical arc.

The ERMS function can be engaged/disengaged through an external lockable selector switch with an additional dedicated ESM hardware module (ERMS Switch Module) and/or through the MasterPacT MTZ Mobile App. Activating ERMS will change the trip curve from A or B to ERMS protection L, S, I and/or G trip settings.

ERMS settings are set to the minimum values at the factory. ERMS setting values need to be adjusted according to the arc flash study. Setting changes may be made with the Mobile app or Ecoreach software. When ERMS is engaged, the MicroLogic X embedded HMI backlight is blue and the ERMS LED is illuminated.

When ERMS is engaged:

• The MicroLogic X control unit front face has a blue LED indicating ERMS.

• The MicroLogic X control unit embedded display has a blue backlight.

• A light can be connected to the ESM hardware module as an external visual indicator.

• ERMS notice is sent to a PC which has Ecoreach software.

• ERMS notice is sent through the customer communications network (Ethernet or Modbus SL [RTU]).

Benefits

The ERMS function is one of the approved methods in the NEC 240.87 (National Electric Code) to reduce arc energy. ERMS can be engaged/disengaged wirelessly with a smart device or with an external switch.