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Mains monitoring relay CDMR-62

General information:

The CDMR-62 is a digital line monitoring relay on a micro-controller basis with high measuring accuracy and 13 monitor-

ing functions, which are designated by the following abbreviations:

U< ... Undervoltage stage 1

U<< ... Undervoltage stage 2

U<<<

Undervoltage stage 3

U> ... Overvoltage stage 1

U>> ... Overvoltage stage 2

Relay configuration

See Fig. 3 and Fig. 4 as basic information for configuration through the front control panel, see page 8 for configurations

through serial interface.

Line

50.00Hz

57V

Undervoltage U<<

Stage2 K1__4_ <-

Undervoltage

Stage1 K_____ <-

Settings for 3-wire or 4-wire grid

The star voltages are monitored in the 4-wire grid. The triangular voltages are monitored in the 3-wire grid, the star point

will be created internally. The limit values (U<<< ...U>>, Asy) for the star and triangular voltages are stored independently

from each other. Depending on the selected grid type, only the star or the triangular voltage limits are visible and adjust-

able at the CDMR-62 as well as in the PC parameterizing program.

Connection to a 1-phase grid: Connect voltage to the inputs L1, L2 and L3, grid type = "4-wire".

Voltage monitoring U<<<, U<<, U<, U>, U>>

Voltage measurement (root mean square values, digital harmonic filter) includes the star voltages and the phase-to-

phase voltages. The monitoring is sensitive to individual phases (U< excitation if at least one phase is below the limit

value, U> excitation if at least one phase is above the limit value). The undervoltage triggering can be blocked through

input "B" (see section "External blockade input"). When using the measuring voltage as auxiliary voltage, then the mes-

sage relays for U<, U<< or U<<< must be operated inverted, because otherwise undervoltage cannot be reported if the

auxiliary voltage fails.

Important: At least one undervoltage stage >= 70% must be set for standard grid parallel operation applications

because the frequency and vector shift triggering will be blocked below 70%Un and because otherwise there

would be a voltage range for which no triggering can be performed.

Special function:

2-phase sensitivity for the U< switching stage

This special function can be activated using the parameter "U< Trip Logic" in the menu block "General settings".

U< Trip Logic = OFF:

CDMR62e_man_A1.doc

/ Operating instructions

f< ...

f<< ... Under frequency stage 2

f> ...

f>> ...

Information: The standard display with the current line values appears when connect-

ing the auxiliary voltage. Starting with this menu, the arrow keys can be used to browse

through all main menus. Using the ENTER button, one gets from the main menus to the

chain of detailed menus

1st Step: Setting the grid type (3/4-wire grid) in the menu block "General settings".

These settings must be established at the start because different data records are allo-

cated to the 3-wire and 4-wire grid voltage monitoring.

2nd Step: Activation and parameterizing of the required monitoring functions:

Selection of the appropriate main menu (example left U<<). The main and detail menus

always include the abbreviation of the respective switching step in the upper right area.

The output relays, which act on the switching stage (e.g. "K1__4_" with effect on K1 and

K4), are always listed on the second line

A switching stage is

Information:

play "K_____" in main menu).

Change of the setup values, see page 5.

Individual phase sensitivity U< Triggering, if at least one phase

undershoot the limit value.

Undervoltage stage 1

Overfrequencies stage 1

Overvoltage stage 2

inactive if no output relay is allocated to it (dis-

Page 4

Vk> ...Vector shift

Asy ... Voltage asymmetry

Wsy ... Angle asymmetry

DRE ...Rotational direction