Application note
Contents
1. output 2 Connection via the USB port Wlicrolngi a 2 eee a a E 1 Standard USB cable connecting the maintenance module to the PC Maintenance module power supply unit Micrologic cable connecting the maintenance module to the trip unit test socket GO N Test It is easy to test whether the reflex load shedding solution has been implemented by using the LSU Local Simulation Utility software This software which is available from schneider electric com can be used to simulate the electrical variables I V f THD phase shift angle phi The USB port is connected via the maintenance module From the LSU software a current is simulated on phase 1 11 83 A for example and at the end of the activation time delay 20 s it is noted that output 2 on the SDx module changes to 1 and therefore supplies the coil of the load shedding contactor CT that will cut off the non priority feeders To change the SDx module output back to 0 a current of less than 30 A must be simulated on phase 1 for at least 10s The same procedure can be followed for load shedding solutions based on the power or frequency threshold 2 Centralised load shedding solution via a remote order Description The centralised load shedding order is generated by the controller PC or PLC The controller is used to generate load shedding orders based on monitoring the electrical variables of the entire electrical installation taking the time ban2. therefore optimises costs Example 3 Load shedding based on frequency threshold f possible to redress the balance and therefore to improve availability After configuring the thresholds all that is required is to assign the alarm to output 2 on the SDx module as output 1 is already assigned to the SDT long delay tripping notification The reflex load shedding order is therefore sent to the load shedding contactor via the SDx module installed in the Compact NSX circuit breaker This load shedding contactor 2 pole NC cuts off the non priority feeders This solution is therefore very easy to The detection of a network frequency low threshold overrun in implement the event of the installation being operated by a diesel generator indicates an imbalance between the demand and the capacity of the generator Load shedding makes it Products used Product Description Cat no Compact NSX100N Three pole breaking unit LV429006 Micrologic Electronic trip unit with energy measurement Micrologic 5 2 E LV429095 SDx Two output module LV429532 CT Two pole contactor 2 pole NC 20 A 15387 Configuration Example 2 Load shedding based on a total demand The alarms are configured using the RSU software downloadable from schneider electric com Example 1 Load shedding based on the instantaneous current threshold of the phase 11 Alarms setup r Selected alarm Mone Priority Medium hi Drop out we
3. How to shed non priority loads with a Compact NSX circuit breaker Equipment diagrams and configurations required for the load shedding function Introduction Load shedding is one of the active energy efficiency actions Load shedding i e preventing some non priority loads from being supplied during a certain period of time can be used to supply power to an entire electrical installation by subscribing to the most appropriate contract possible with the electricity distributor thereby saving money The advantages of energy efficiency are e lower consumption e cost optimisation improved availability Nowadays this involves all the energy consumers industries buildings shops or individuals Load shedding is used to e prevent overload tripping if the load approaches the maximum load threshold a load shedding order on previously selected loads will prevent a general power failure throughout the installation improved availability e subscribe to a lower level contract whilst still guaranteeing that all the devices operate correctly e carry the consumption forward to an off peak tariff period cost optimisation Two load shedding solutions are provided e reflex load shedding via a local order e centralised load shedding via a remote order Reflex load shedding Centralised load shedding PC or PLC controller Ethernet Compact NSX100N SDx Boiler Priority loads Non priority load 1
4. Reflex load shedding via a local order Description The reflex load shedding order is generated by the Compact NSX circuit breaker itself via the Micrologic electronic trip unit In fact the Micrologic E electronic trip unit energy measurement is used to manage alarms based on the monitoring of electrical variables such as the instantaneous current the demand power Pdmd or even the frequency An activation pick up threshold SA with its time delay TA and a deactivation drop out threshold SD with its time delay TD are associated with each alarm The time delays are independent and can be set from 1 s to 3000 s The following figure illustrates the high alarm activation condition SA Activation threshold TA Activation time delay SD Deactivation threshold TD Deactivation time delay 1 Alarm activation zone green Example 1 Load shedding based on the instantaneous current threshold on a phase The detection of an instantaneous current high threshold overrun on a phase indicates an overload on this phase Shedding a single phase load connected to this phase prevents the circuit breaker from tripping on overload long time delay and therefore improves availability Example 2 Load shedding based on a total demand power threshold Pdmd The detection of an demand total power high threshold overrun indicates an overload on this installation Load shedding prevents the subscribed power from being exceeded and
5. ds operating constraints or even process related information into consideration The centralised load shedding order is sent to the BSCM module installed in the Compact NSX circuit breaker via the Modbus communication network BSCM The BSCM module is itself connected to the communicating remote control The communicating remote control is the actuator that opens or closes the NSX circuit breaker The FDM 121 switchboard display unit can be added as an optional extra In addition to displaying measurements alarms and operating information the FDM 121 can be used to give a local order to open close the Compact NSX circuit breaker In remote mode only orders from the controller are taken into account In local mode only orders from the Compact NSX display unit are taken into account with remote control This ensures for example that no unwanted circuit breaker opening orders are received and that the closed position is maintained during a critical operation backup transfer of sensitive data etc FDM121 A powerful flexible solution Products used Product Description Cat no Compact NSX100N Three pole circuit breaker fitted with a TM D 100 A thermomagnetic trip unit LV429840 MTc Communicating remote control LV42944 1 BSCM Breaker Status Control Module LV434205 NSX Cord Length of wiring L 1 3 m LV434201 IFM Modbus interface TRV00210 FDM121 Switchboard display unit TRV00121 EGX100 Modbus Ethe
6. f ce za A Cancel The load shedding order is given as soon as the phase 1 current exceeds 80 A for more than 20s This order will be maintained as long as the phase 1 current does not fall below 30 Afor more than 10 s Note To avoid beat phenomena it is recommended that the difference between the high threshold 80 A and the low threshold 30 A should be greater than the current consumed by the shed load pee ee A value 4 80 value A 30 delay rs 20 delay s 10 power threshold Pdmd Alarms setup selected alarm Over KA Power dma Priority Medium Drop out af A Taal ee tt cal coal II value ke 53 value kA 20 delay 70 delay 2 15 _ The load shedding order is given as soon as the total demand power exceeds 53 kW for more than 70 s This order will be maintained as long as the total demand power does not fall below 20 kW for more than 15s Example 3 Load shedding based on frequency threshold f Cancel Alarms setup m Selected alarm Under Frecuency Priority Medium 7 Drop out ETES ESET delay s 2 l aeaye 5 OK a Cancel al The load shedding order is given as soon as the frequency falls below 48 Hz for more than 2 s This order will be maintained as long as the frequency does not rise above 49 5 kW for more than 5 s Code 92 Pick up value Hz 48 0 Five EER value Hz 49 5 Diagram 230 V SDT output 1
7. h Compact NSX provides a reduction in capital expenditure as its purchase price is lower than that of a traditional solution the cost of a Compact NSX with a Micrologic E trip unit energy measurement SDx module is similar to the cost of a Compact NSX without the measurement function Power Meter I O CT The difference is the cost of installing wiring testing the CTs which is included in the Compact NSX a reduction in operational expenditure due to optimised energy costs and to the improved availability provided by the load shedding function As standards specifications and designs change from time to time please ask for confirmation Schneider Electric Industries SAS of the information given in this publication 35 rue Joseph Monier oS CS 30323 amp amp This document has been printed on ecological paper F 92506 Rueil Malmaison Cedex Design Schneider Electric RCS Nanterre 954 503 439 Photos Schneider Electric Capital social 896 313 776 Printed www schneider electric com 04 2009 2009 Schneider Electric All rights reserved
8. rnet communication gateway EGX100MG Configuration No special configuration for the Micrologic The load shedding order circuit breaker opening closing is sent by the controller to the BSCM module via the Modbus network The configuration of the BSCM module Modbus circuit breaker opening closing orders is specified in the Compact NSX Modbus operations guide LV434106 pdf Ethernet LILNA HAAA Switches JTT 2 wire UP ON DOWN OFF th u Test It is easy to test whether the centralised load shedding solution has been implemented by using the RCU Remote Control Utility software This software which is available from schneider electric com can be used to open close the Compact NSX circuit breaker via the communicating remote control Connection to the PC Ethernet port is via the Modbus Ethernet EGX communication gateway In the main set up menu go to the User profile submenu and choose control The control tab is now available and can be used to check that the communicating remote control is operating correctly over the Modbus network ACU 3 00 4 File Communication Setup Update Help E E Schneider iP Electric ready b alarm On Demonstration ia uo Pew Erw THD pa Misel Conta Energy counters Open Close remote control Epwi D0 r 1670272008 11 10 08 Egikyah D Eskean Eo Update counters Conclusion The reflex load shedding solution via a local order wit
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