ABB RELION REL670, Руководство по эксплуатации продукта

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Table 9. Local HMI functions
IEC 61850 or function
name ANSI Description
LHMICTRL Local HMI signals
LANGUAGE Local human machine language
SCREEN Local HMI Local human machine screen behavior
FNKEYTY1–FNKEYTY5
FNKEYMD1–
FNKEYMD5 Parameter setting function for HMI in PCM600
LEDGEN General LED indication part for LHMI
OPENCLOSE_LED LHMI LEDs for open and close keys
GRP1_LED1–
GRP1_LED15
GRP2_LED1–
GRP2_LED15
GRP3_LED1–
GRP3_LED15 Basic part for CP HW LED indication module
3. Differential protection
High impedance differential protection, single phase HZPDIF
High impedance differential protection, single phase (HZPDIF)
functions can be used when the involved CT cores have the
same turns ratio and similar magnetizing characteristics. It
utilizes an external CT secondary current summation by wiring.
Actually all CT secondary circuits which are involved in the
differential scheme are connected in parallel. External series
resistor, and a voltage dependent resistor which are both
mounted externally to the IED, are also required.
The external resistor unit shall be ordered under IED
accessories in the Product Guide.
HZPDIF can be used to protect tee-feeders or busbars,
reactors, motors, auto-transformers, capacitor banks and so
on. One such function block is used for a high-impedance
restricted earth fault protection. Three such function blocks are
used to form three-phase, phase-segregated differential
protection.
Additional security logic for differential protection LDRGFC
Additional security logic for differential protection (LDRGFC)
can help the security of the protection especially when the
communication system is in abnormal status or for example
when there is unspecified asymmetry in the communication link.
It helps to reduce the probability for mal-operation of the
protection. LDRGFC is more sensitive than the main protection
logic to always release operation for all faults detected by the
differential function. LDRGFC consists of four sub functions:
• Phase-to-phase current variation
• Zero sequence current criterion
• Low voltage criterion
• Low current criterion
Phase-to-phase current variation takes the current samples as
input and it calculates the variation using the sampling value
based algorithm. Phase-to-phase current variation function is
major one to fulfill the objectives of the startup element.
Zero sequence criterion takes the zero sequence current as
input. It increases the security of protection during the high
impedance fault conditions.
Low voltage criterion takes the phase voltages and phase-to-
phase voltages as inputs. It increases the security of protection
when the three-phase fault occurred on the weak end side.
Low current criterion takes the phase currents as inputs and it
increases the dependability during the switch onto fault case of
unloaded line.
The differential function can be allowed to trip as no load is fed
through the line and protection is not working correctly.
Features:
1MRK 506 372-BEN -
Line distance protection REL670 2.2
Product version: 2.2
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