ABB 3HNM 01370-1 Hose Kit

LOAD SHEDDING
General
The load shedding system has to ensure the availability of electrical power to all essential and most critical
loads in the plant. This is achieved by switching off non essential loads in case of a lack of power in the plant
electrical network, or parts of the plant electrical network. A lack of electrical pow er can be caused by loss of
generation capacity or disconnection from the public power company supply.
The load shedding system can be implemented by one or more of the following functions:
• primary load shedding
• frequency load shedding
• manual load shedding
• maximum peak power demand shedding
Main input to the load shedding system is the register received from another function of the ABB Advant EMS
function called “Network Configuration Determination”, which determines the configuration of the elect rical
network. The configuration is determined from the checked breaker positions.
Secondly, load shedding needs data from the loadflow in the network. Data regarding the loads on the busses
and the power generated by each generator is sent to the central load shedding function by analogue inputs
and software has already checked the validity of the data. Where available, the measured power of each load
is used. This data can be received from the analogue inputs in the process controllers or via serial link s to the
MCC’s. When there is no power measurement available for a particular load, the belonging position of the
breaker is used together with the nominal power value. Load shedding uses data representing the loadflow in
the network, which is at least 2 s econds old, to prevent load shedding from using data which was obtained
while the network was already in a faulty and thus unstable condition.



Euchner TP2-528A024SR6 087441

FAFNIR NB 220H Z-65.11-185

Testo 0409 9999 4603876/10

Teko MPX 940 Multiplexer

EPCOS B84144 A0016R140

Panasonic MX9G36B

ATEN CE-220L KVM

Wenglor YM24PAH2ABF

Sixnet EB-PSE-24V-1B Rev:3.00

Martens Elektronik MU500 MU500-51-0/99

TESCH E58.2x09x06

Schmersal Positionsschalter UV8H 433y

VISOLUX VS VEG-T-Ga

VISOLUX VS-VEG-T/Z Signalumformer 9.806 009

HURST NT Dynamo S784218

Bihl + Wiedemann BW1441 Id. Nr. 11550 AS-i/Profibus

Bihl + Wiedemann BW1440 Id. Nr. 11434 AS-i/Profibus

Graco Pneumatik Regelventil 104266 300

Baumer electric IFRM 08P1398/S35AL

TURCK IM1-12Ex-R

Benedikt & Jger Schútz K3-18A10 = 60

VISOLUX VS/21D

WAGO 750-333 I/O-Systeme

EATON STI0.315 STIP32-12-B2

Schmersal SRB 301LC/B

Wixom MAC Ventil 722C-12-PI-111CA

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GRACO 104266 REGULATOR AIR W PSI 250

Pizzato FA4131-5DN

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Elektra Tailfingen D5 11/HS-F45-D-SS 23052

Keyence FU-88 Lichtleiter

CentreCOM FH807u 100Base-FX & Switch AT-FH807u-00