Inputs/Outputs; Contact Inputs - GE D30 Instruction Manual

INPUTS/OUTPUTS

5.9 Inputs/outputs

5.9.1 Contact inputs

SETTINGS  INPUTS/OUTPUTS  CONTACT INPUTS
 CONTACT INPUTS

5
A contact inputs and outputs are digital signals associated with connections to hard-wired contacts. Wet and dry contacts
are supported.
The contact inputs menu contains configuration settings for each contact input as well as voltage thresholds for each
group of four contact inputs. Upon startup, the relay processor determines (from an assessment of the installed modules)
which contact inputs are available and then display settings for only those inputs.
An alphanumeric ID can be assigned to a contact input for diagnostic, setting, and event recording purposes. The
(Logic 1) FlexLogic operand corresponds to contact input "X" being closed, while
X On
input "X" being open. The
bouncing' conditions. As this time differs for different contact types and manufacturers, set it as a maximum contact
debounce time (per manufacturer specifications) plus some margin to ensure proper operation. If
set to "Enabled," every change in the contact input state triggers an event.
A raw status is scanned for all Contact Inputs synchronously at the constant rate of 0.5 ms as shown in the following
figure. The DC input voltage is compared to a user-settable threshold. A new contact input state must be maintained for a
user-settable debounce time in order for the D30 to validate the new contact state. In the following figure, the debounce
time is set at 2.5 ms; thus the 6th sample in a row validates the change of state (mark no. 1 in the diagram). Once validated
(de-bounced), the contact input asserts a corresponding FlexLogic operand and logs an event as per user setting.
A time stamp of the first sample in the sequence that validates the new state is used when logging the change of the
contact input into the Event Recorder (mark no. 2 in the figure).
5-254
 CONTACT INPUT H5a





↓
 CONTACT INPUT xxx


 CONTACT INPUT

 THRESHOLDS



defines the time required for the contact to overcome 'contact
CONTACT INPUT DEBNCE TIME
CONTACT INPUT H5a ID: Range: up to 12 alphanumeric
Cont Ip 1 characters
CONTACT INPUT H5a Range: 0.0 to 16.0 ms in steps of 0.5
DEBNCE TIME: 2.0 ms
CONTACT INPUT H5a Range: Disabled, Enabled
EVENTS: Disabled
Ips H5a,H5c,H6a,H6c Range: 17, 33, 84, 166 Vdc
THRESHOLD: 33 Vdc
Ips H7a,H7c,H8a,H8c Range: 17, 33, 84, 166 Vdc
THRESHOLD: 33 Vdc
↓
Ips xxx,xxx,xxx,xxx Range: 17, 33, 84, 166 Vdc
THRESHOLD: 33 Vdc
CONTACT IP X Off
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
CONTACT IP
corresponds to contact
is
CONTACT INPUT EVENTS