Electrical Connection; Functional Description - ABB CM-UFD.M31 Betriebs- Und Montageanleitung

Electrical connection

A1-A2 Control supply voltage U
L1, L2, L3, N Measuring inputs
Y1-Y0 Control input 1: Feedback from switching device 1
Y2-Y0 Control input 2: Feedback from switching device 2
Y3-Y0 Control input 3: Remote trip, suppress Y1, suppress Y2, suppress Y1/Y2 or suppress vector shift detection
11 -12 /14 Output relay 1: Relay for tripping switching device 1 of the section switch
15 16 18
Closed-circuit principle
21 -22 /24 Output relay 2: Relay for tripping switching device 2 of the section switch
25 26 28
Closed-circuit principle
31 -32 /34 Output relay 3: Closing command for circuit breaker motor,
35 36 38
Configuration possibilities: Closed-circuit principle, open-circuit principle, disabled or synchronous with R1/R2
Important notice:
In the supply line A1-A2 in the vicinity of the device (easily accessible), a switch marked as disconnecting device as well as an
overcurrent protection element (rated current
The cable length at the control inputs must not exceed 10 m.
Warning:
Hazardous electrical voltage! Can lead to electric shock and burns. Before starting work, switch plant and device voltage-free.

Functional description

Basic protective functions
If control voltage is applied, all phases are present and the switch-on conditions for voltages and frequency are fulfilled, output relays R1
and R2 energize synchronously after the adjustable switch-on delay.
The device provides, among others, following protective functions:
Overvoltage protection (10-min average value)
Overvoltage protection
Undervoltage protection
Overfrequency protection
Underfrequency protection
If a measured value exceeds or falls below the adjustable threshold (overvoltage, undervoltage, overfrequency or underfrequency), R1 and
R2 de-energize after the adjustable tripping delay. As soon as the measured value returns to the tolerance range - taking into account an
adjustable hysteresis – and all further switch-on conditions are fulfilled, R1 and R2 re-energize.
ROCOF (Rate of change of frequency df/dt)
This function monitors the rate of change of frequency within a very short time. This is how a possible loss of main (islanding) is detected.
The monitoring function ROCOF is disabled by default. It can be manually enabled in the menu.
Vector shift detection
This function detects a shift of the phase position of the grid voltage. This is how a possible loss of main (islanding) is detected. The
monitoring function vector shift is disabled by default. It can be manually enabled in the menu.
Interrupted neutral detection
Interrupted neutral detection is always active when one of the phase-neutral measuring principles is selected in the menu „Nominal
voltage". The interruption of the neutral conductor will result in an immediate tripping of output relays R1 and R2.
Switch-on conditions
In order to switch on the section switch after having applied control supply voltage or after a fault, the voltages as well as the frequency
must stay within the set tripping thresholds during the switch-on delay. This window of voltage and frequency can be further restricted in
the menu "Switch-on conditions". If one parameter leaves the window, the switch-on process is interrupted. When all parameters fulfill the
switch-on conditions again, the switch-on delay restarts. If the function "Short interruption" is enabled in the menu "Switch-on conditions"
-> "Switch-on delay", the switch-on delay will be reduced to 5 s in case of a short interruption of < 3 s.
Output relay R3 (31 -32
35 36
Output relay R3 can be used for the closing command of a breaker motor. For this function the working principle "closed-circuit" or "open-
circuit" must be selected. When output relays R1 and R2 energize, the adjustable ON-delay starts. When timing is complete, R3 will be
activated for the duration of the ON-time or until R1 and R2 de-energize. Additionally R3 can be configured as "synchronous with R1/R2"
or "disabled". With these configurations the settings for the ON-delay and the ON-time have no influence on the operating function.
s
>U
>U1, >U2
<U1, <U2
>F1, >F2
<F1, <F2
/34 )
38
6 A) has to be provided.
AV
7