ABB REL 356

ABB REL 356 Current Differential Protection
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Product Overview and Specifications
Optional Computer/Network Interface
· RS232C PONI for single point computer communications
· RS232C PONI with IRIG-B for modulated/de-modulated IRIG-B time synchronization
· Modbus PONI for DNP 3.0 network communications (requires an external MIPC card)
· INCOM PONI for local network communications using INCOM network
Chassis Dimensions and Weight
Height 7” (177.8 mm), 4 rack units
Width 19” (482.6 mm)
Depth including terminal blocks 14” (356 mm)
Weight 68 lb (17.5 kg)
Environmental Data
Ambient temperature range
Operation - 20°C to + 60°C
Storage - 40° C to + 80°C
Insulation test voltage, ANSI C37.90, IEC 255-5 2.8 kV dc, 1 minute
3.2 kV dc, 1 second
Open contacts 1400 V dc, continuous
Impulse voltage withstand, IEC 255-5 1.2/50 ms, 0.5 Joule
Surge withstand voltage, ANSI C37.90.1, IEC 255-22-1 3 kV, 1 MHz
Fast transient voltage, ANSI C37.90.1, IEC 255-22-4 4 kV, 10/100 ns
EMI field strength withstand, ANSI C37.90.2 25 MHz – 1 GHz, 10 V/m
Emission tests, EN 50081-1, class A
Conducted emissions 150 kHz – 30 MHz
Radiated emissions 30 MHz – 1000 MHz
CT Requirements for REL356 Current Differential Protection
REL356 uses the operating principle of comparing an operating quantity OP with a restraint quantity RES. The operating
quantity is formed from:
TLTR
IIOP +=
where ITR is the remote composite current and ITL is the local composite current. ITR and ITL are formed by local and
remote currents, respectively, in the following manner:
02211
0ICICICI
T
++−=
The restraint quantity is formed from:
TLTR
IIRES +=