Schneider Electric PM810, PM870, PM820, PM850 manual Detection of Interruptions of the Supply Voltage

PowerLogicTM Series 800 Power Meter						63230-500-225A2
Appendix D—Advanced Power Quality Evaluations							3/2011
	Table D–8: Voltage dip classifications
			Duration (t) seconds
	Depth (D) % Nominal	1 ≤ t < 3	3 ≤ t < 10	10 ≤ t < 20	20 ≤ t < 60	60 ≤ t < 180	Total
	10 ≤ D < 15
	15 ≤ D < 30
	30 ≤ D < 45
	45 ≤ D < 60
	60 ≤ D < 75
	75 ≤ D < 90
	90 ≤ D < 99
	Total

You can configure the number of allowable events per week for each range of Depth in registers 3920 – 3927. (Default = -32768 = Pass/Fail evaluation disabled.)

Detection of Interruptions of the Supply Voltage

The standard defines an interruption as voltage less than 1% of nominal voltage. Because some locations require a different definition, you can configure this value in register 3906. Interruptions are classified as “short” if duration ≤ 3 minutes or “long” otherwise. The PM850 and the PM870 classifies interruptions as shown in Table D–9.

Table D–9: Voltage interruptions

Duration (t) seconds

	t < 1	1 ≤ t < 2	2 ≤ t < 5	5 ≤ t <	10 ≤ t <	20 ≤ t <	60 ≤ t <	180 ≤ t <	600 ≤ t <	1200 ≤ t
				10	20	60	180	600	1200
Total

You can configure the number of allowable short interruptions per year in register 3918 (Default = -32768 = Pass/Fail evaluation disabled). You can configure the number of allowable long interruptions per year in register 3919. (Default = -32768 = Pass/Fail evaluation disabled.)

Detecting and Classifying Temporary Power Frequency Over-voltages

As stated in EN50160, a temporary power frequency over-voltage generally appears during a fault in the electrical utility power distribution system or in a customer’s installation, and disappears when the fault is cleared. Usually, the over-voltage may reach the value of phase-to-phase voltage because of a shift of the neutral point of the three-phase voltage system.

Under certain circumstances, a fault occurring upstream from a transformer will produce temporary over-voltages on the low voltage side for the time during which the fault current flows. Such over-voltages will generally not exceed 1.5 kV rms.

Table D–10shows how the PM850 and the PM870 detect and classify the over-voltages for each phase voltage.

NOTE: Disturbance alarms are used to detect these events in the PM870. In the PM850, standard speed over-voltage alarms are used to detect these events.

Table D–10: Over-voltages

Duration (t) seconds

Magnitude (M) %	1	≤ t < 3	3 ≤ t < 10	10 ≤ t < 20	20 ≤ t < 60	60 ≤ t < 180	Total
Nominal
110 < M ≤ 115
115 < M ≤ 130
130 < M ≤ 145
145 < M ≤ 160
160 < M ≤ 175
175 < M ≤ 200
M > 200
Total

You can configure the number of allowable events per week for each range of magnitude in registers 3930 – 3937. (Default = -32768 = Pass/Fail evaluation disabled.)

98 © 2011 Schneider Electric. All Rights Reserved.