Open chuck-h opened 5 years ago
Some issues with the OCA model
Consider a data table representing "circuits". A circuit
corresponds physically to a single current-carrying wire. Characteristics of a circuit
include:
circuit
Installations may be single-phase or three-phase. Single-phase loads may be connected line-to-line or line-to-neutral. These arrangements are captured by treating each non-neutral conductor as a circuit
.
Single-phase line-to-lline loads and three-phase loads are fed by two-pole and three-pole circuit breakers, respectively. A multipole circuit breaker "trips", and disconnects all poles, when any one circuit exceeds the breaker rating.
A second data table of load
s will be useful. A load
might be an EV charging station, or a non-EV load whose consumption is measured or estimated. A load
will have connections to one, two, or three circuit
s; this can be represented in a load_connections
table.
Questions
A circuit
at any given time will be carrying a certain amount of current. This value might be reported by a charging station, measured by a separate sensor, or possibly estimated or computed. Should the circuit
table be continually updated with current readings?
OCA presents a model for electrical distribution hierarchy in OCPP2.0 "Standardized Components" 3.2.24, and gives an illustrative example at 3.2.41
Loosely speaking, the function of a typical load management system is to adjust the current consumed at each of the charging stations so that no Fuse is carrying over its rated current.