GE Power Quality Meter Series, Инструкция по эксплуатации

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GE Power Management PQM Power Quality Meter A-11
APPENDIX A A.1 PQM APPLICATION NOTES
A
A.1.5 PULSE OUTPUT APPLICATION
APPLICATION NOTE PQMAN05: PULSE OUTPUT APPLICATION
Up to 4 SPDT Form C output relays are configurable as Pulse Initiators based on energy quantities calculated
by the PQM. Variables to consider when using the PQM as a Pulse Initiator are:
• PQM Pulse Output Parameter
• PQM Pulse Output Interval
• PQM Pulse Output Width
• PQM Output Relay Operation
• Pulse Acceptance Capability of the end receiver
• Type of Pulse Receiver
• Maximum Energy Consumed over a defined interval
1. PQM Pulse Output Parameter: The PQM activates the assigned output relay based upon the energy
quantity used as the base unit for pulse initiation. These energy quantities include ±kWhr, ±kVARh, and
kVAh.
2. PQM Pulse Output Interval: The PQM activates the assigned output relay at the accumulation of each
Pulse Output Interval as defined by the user. This interval is based upon system parameters such that the
PQM pulse output activates at a rate not exceeding the Pulse Acceptance Capability of the end receiver.
3. PQM Pulse Output Width: This user defined parameter defines the duration of the pulse initiated by the
PQM when a quantity of energy equal to the Pulse Output Interval has accumulated. It is based upon sys-
tem parameters such that the PQM pulse output will activate for a duration that is within the operating
parameters of the end receiver.
4. PQM Output Relay Operation: This user defined parameter defines the normal state of the PQM output
relay contacts, i.e. Fail-safe or Non-Failsafe.
5. Pulse Acceptance Capability of the end Receiver: This parameter is normally expressed as any one of
the following: (a) Pulses per Demand Interval; (b) Pulses per second, minute or hour; (c) Minimum time
between successive closures of the contacts.
6. Type of Pulse Receiver: There are 4 basic types of Pulse receivers: a) Three-wire, every pulse counting;
b) Three-wire, every other pulse counting; c) Two-wire, Form A normally open, counts only each contact
closure; d) Two-wire, counts every state change, i.e. recognizes both contact closure and contact opening.
7. Maximum Energy Consumed over a defined interval: This is based upon system parameters and
defines the maximum amount of energy that may be accumulated over a specific time.
Application of the PQM Pulse Output Relays to an End Receiver Using KYZ Terminals:
Typical end receivers require a contact closure between KY or KZ based upon the type of receiver. The PQM
Pulse Output feature can be used with either two- or three-wire connections. The PQM activates the desig-
nated Output Relay at each accumulation of the defined Pulse Output Interval for the defined Pulse Output
Width. Therefore, each PQM contact operation represents one interval. For end receivers that count each clo-
sure and opening of the output contacts, the PQM Pulse Output Interval should be adjusted to match the regis-
tration of the end receiver. For example, if the end receiver counts each closure as 100 kWh and each opening
as 100 kWh, the PQM Pulse Output Interval should be set to 50 kWh.
The PQM Output Relays can be configured as Failsafe or Non-Failsafe to match the normally open/closed
configuration of the KY and KZ connections at the end receiver. The K connection is always made to the COM
connection of the designated PQM output relay, and the Y and Z connections can be made to the N/O or N/C
connections based upon the type of end receiver.