4.2.3 Voltage
The protection functions of the interconnection system shall detect the effective (rms) or fundamental
frequency value of each phase-to-phase voltage, except where the transformer connecting the Local EPS to
the Area EPS is a grounded wye-wye configuration, or single-phase installation, the phase-to-neutral voltage
shall be detected. When any voltage is in a range given in Table 1, the DR shall cease to energize the Area
EPS within the clearing time as indicated. Clearing time is the time between the start of the abnormal
condition and the DR ceasing to energize the Area EPS. For DR less than or equal to 30 kW in peak
capacity, the voltage set points and clearing times shall be either fixed or field adjustable. For DR greater
than 30 kW, the voltage set points shall be field adjustable.
The voltages shall be detected at either the PCC or the point of DR connection when any of the following
conditions exist:
a) The aggregate capacity of DR systems connected to a single PCC is less than or equal to 30 kW,
b) The interconnection equipment is certified to pass a non-islanding test for the system to which it is
to be connected,
c) The aggregate DR capacity is less than 50% of the total Local EPS minimum annual integrated electrical
demand for a 15 minute time period, and export of real or reactive power by the DR to the
Area EPS is not permitted.
4.2.3 Voltage
The protection functions of the interconnection system shall detect the effective (rms) or fundamental
frequency value of each phase-to-phase voltage, except where the transformer connecting the Local EPS to
the Area EPS is a grounded wye-wye configuration, or single-phase installation, the phase-to-neutral voltage
shall be detected. When any voltage is in a range given in Table 1, the DR shall cease to energize the Area
EPS within the clearing time as indicated. Clearing time is the time between the start of the abnormal
condition and the DR ceasing to energize the Area EPS. For DR less than or equal to 30 kW in peak
capacity, the voltage set points and clearing times shall be either fixed or field adjustable. For DR greater
than 30 kW, the voltage set points shall be field adjustable.
The voltages shall be detected at either the PCC or the point of DR connection when any of the following
conditions exist:
a) The aggregate capacity of DR systems connected to a single PCC is less than or equal to 30 kW,
b) The interconnection equipment is certified to pass a non-islanding test for the system to which it is
to be connected,
c) The aggregate DR capacity is less than 50% of the total Local EPS minimum annual integrated electrical
demand for a 15 minute time period, and export of real or reactive power by the DR to the
Area EPS is not permitted.
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