Devices of differential protection of the dvukhobmotochny MRZS-05-05 transformer

It is used as the main protection of the dvukhobmotochny transformer.
Carries out the following functions:
Provides control and measurement of the following sizes:

• three phase currents of the low party of In = 5A;
• three phase currents of the high party of In = 5A;
• three phase tension to 100 V;

The following sizes are calculated:

• settlement current of zero sequence of the high party;
• settlement current of zero sequence of the low party;
• current of the return sequence of the high party;
• current of the return sequence of the low party;
• three phases of differential current;
• three phases of the second harmonica of differential current;
• three phases of current of braking;
• three phases of current of operation of the first step;
• three phases of current of operation of the second step;
• active and jet capacities of the low party.

Functions of relay protection:

• The main protection of the transformer in the form of longitudinal two-level differential current protection with braking against the maximum phase current of the parties of the highest and lowest tension. Alignment of rated currents of the parties of the highest and lowest tension, correction of a corner of vectors of currents of the party of the lowest tension is provided.
• protection against a transformer overload.
• gas protection of the transformer.
• thermal protection of the transformer.

Functions of automatic equipment:

• inclusion and shutdown of the switch

Expansions of logic:

• 16 defined functions working in the direct and return mode. There is an opportunity to collect on their base and by means of comparators additional protection and/or to change logic of work of existing;
• 3 inertial functions with an inertia time setting (for creation of arc protection, etc.);
• 3 comparators of tension with exits on three phases with an opportunity to form Umin or Umakh;
• 1 comparator of tension of the return sequence;
• 2 comparators of current of the low party with exits on three phases;
• 2 comparators of current of the high party with exits on three phases;
• 1 comparator of settlement current 3lo of the low party;
• 1 comparator of settlement current 3lo of the high party;
• 1 comparator of settlement current of the return sequence of the low party;
• 1 comparator of settlement current of the return sequence of the high party;
• 3 defined triggers. There is an opportunity to bind, to teams of installation and dumping of the trigger, any function of the table of ranging and/or a discrete entrance.

Emergency registrar of oscillograms of currents and tension
Registrar of discrete signals

• 50 last accidents;
• to 50 records in each accident

Quantity:

• discrete exits (relay) of all - 14;
• programmed - 13;
• discrete entrances - 16;
• light-emitting diodes of they are 7;
• programmed - 6.

Control of entrances, exits, indicators, settings, excerpts of time, registrars is carried out by means of free of charge extended service software having potential of record of archives of settings from the file, recording of settings, ranging.