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) limit areThese 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.

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/overvoltage 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 overvoltage 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 overvoltage protections. It is not possible to select phase-to-phase voltages for undervoltage monitoring and phase-to-neutral voltages for overvoltage monitoring and vice versa. Under and overvoltage 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/Overvoltage 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 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 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.