GE PQMII, Инструкция по эксплуатации

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7–14 PQMII POWER QUALITY METER – INSTRUCTION MANUAL
CHAPTER 7: APPLICATIONS
7.5 Pulse Output
7.5.1 Pulse Output Considerations
Up to 4 SPDT Form C output relays are configurable as Pulse Initiators based on energy
quantities calculated by the PQMII. Variables to consider when using the PQMII as a Pulse
Initiator are:
• PQMII Pulse Output Parameter : The PQMII 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.
• PQMII Pulse Output Interval : The PQMII 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 PQMII pulse output activates at a rate
not exceeding the Pulse Acceptance Capability of the end receiver.
• PQMII Pulse Output Width : This user defined parameter defines the duration of the
pulse initiated by the PQMII when a quantity of energy equal to the Pulse Output
Interval has accumulated. It is based upon system parameters such that the PQMII
pulse output will activate for a duration that is within the operating parameters of the
end receiver.
• PQMII Output Relay Operation : This user defined parameter defines the normal state
of the PQMII output relay contacts, i.e. Fail-safe or Non-Failsafe.
• 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.
• 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.
• 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.
7.5.2 Connecting 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 PQMII Pulse Output feature can be used with either two- or three-wire
connections. The PQMII activates the designated Output Relay at each accumulation of
the defined Pulse Output Interval for the defined Pulse Output Width. Therefore, each
PQMII contact operation represents one interval. For end receivers that count each closure
and opening of the output contacts, the PQMII Pulse Output Interval should be adjusted to
match the registration of the end receiver. For example, if the end receiver counts each
closure as 100 kWh and each opening as 100 kWh, the PQMII Pulse Output Interval should
be set to 200 kWh.