Load-side voltage sensing in a power meter
A load-side voltage detection module for a metrology device includes a plurality of first resistors electrically coupled to a first load-side terminal, the first resistors being in series, a plurality of second resistors electrically coupled to a second load-side terminal, the second resistors being in series, a voltage divider electrically coupled between a first line-side terminal and a second line-side terminal, the voltage divider creating a reference voltage for the load-side voltage detection module, and a pulse generator to generate a pulse based on detection of voltage, the pulse indicating a voltage on at least one of the first load-side terminal or the second load-side terminal, above at least one threshold.
1 . A metrology device comprising:
a load-side voltage detection module including:
a pulse generator including:
a first transistor; and
a second transistor, the first transistor and the second transistor configured to generate a pulse on an isolated output; and
a load-side voltage disconnect switch electrically coupled to the load-side voltage detection module, wherein the load-side voltage disconnect switch comprises:
a first line side including a first load;
a second line side including a second load:
a first switch;
a first resistor included between the first line side and the first switch;
a second switch; and
a second resistor included between the second line side and the second switch.
2 . The metrology device of claim 1 , wherein the load-side voltage disconnect switch, in response to the load-side voltage detection module detecting that a load-side voltage is applied to a load-side of the metrology device, is precluded from closing and allowing electrical current to flow via the metrology device.
3 . The metrology device of claim 1 , wherein the load-side voltage disconnect switch is operated based at least in part on a signal sent from a computing device communicatively coupled to the metrology device.
4 . The metrology device of claim 1 , wherein the load-side voltage disconnect switch is located within the metrology device.
5 . The metrology device of claim 1 , wherein the load-side voltage disconnect switch is a separate circuit with respect to the load-side voltage detection module.
6 . The metrology device of claim 1 , wherein the second transistor is in series with the first transistor.
7 . The metrology device of claim 1 , wherein:
the first line side is coupled to a first load-side voltage terminal of the load-side voltage detection module, and
the second line side is coupled to a second load-side voltage terminal of the load-side voltage detection module.
8 . The metrology device of claim 1 , further comprising:
a control line coupled to the first switch and the second switch; and
an actuator coupled to the control line, the actuator controlling the first switch and the second switch.
9 . The metrology device of claim 8 , wherein the actuator is coupled to a computing device to receive instructions from the computing device to actuate to the first switch and the second switch.
10 . A load-side voltage detection module for a metrology device including:
a pulse generator including:
a first transistor; and
a second transistor, the first transistor and the second transistor configured to generate a pulse on an isolated output; and
a load-side voltage disconnect switch electrically coupled to the load-side voltage detection module, wherein the load-side voltage disconnect switch comprises:
a first line side including a first load;
a second line side including a second load;
a first switch;
a first resistor included between the first line side and the first switch;
a second switch; and
a second resistor included between the second line side and the second switch.
11 . The load-side voltage detection module of claim 10 , wherein the second transistor is in series with the first transistor.
12 . The load-side voltage detection module of claim 10 , wherein the load-side voltage disconnect switch, in response to the load-side voltage detection module detecting that a load-side voltage is applied to a load-side of the metrology device, is precluded from closing and allowing electrical current to flow via the metrology device.
13 . The load-side voltage detection module of claim 10 , wherein the load-side voltage disconnect switch is operated based at least in part on a signal sent from a computing device communicatively coupled to the metrology device.
14 . The load-side voltage detection module of claim 10 , wherein the load-side voltage disconnect switch is located within the metrology device.
15 . The load-side voltage detection module of claim 10 , wherein the load-side voltage disconnect switch is a separate circuit with respect to the load-side voltage detection module.
16 . The load-side voltage detection module of claim 10 , wherein:
the first line side is coupled to a first load-side voltage terminal of the load-side voltage detection module, and
the second line side is coupled to a second load-side voltage terminal of the load-side voltage detection module.
17 . The load-side voltage detection module of claim 10 , further comprising:
a control line coupled to the first switch and the second switch; and
an actuator coupled to the control line, the actuator controlling the first switch and the second switch.
18 . The load-side voltage detection module of claim 17 , wherein the actuator is coupled to a computing device to receive instructions from the computing device to actuate to the first switch and the second switch.