Potential problems with voltage_summary.json

[daniel-thom]

Here is the contents of voltage_summary.json after a run of the upgrades module:

[
    {
        "name": "sb10_p12uhs0_1247_trans_301__p12udt1277__random__8__200",
        "scenario": "pf1",
        "stage": "Initial",
        "upgrade_type": "Voltage",
        "simulation_time_s": NaN,
        "thermal_violations_present": false,
        "voltage_violations_present": true,
        "max_bus_voltage": 1.0585652799128094,
        "min_bus_voltage": 1.0166304211042065,
        "num_of_voltage_violation_buses": 16,
        "num_of_overvoltage_violation_buses": 16,
        "voltage_upper_limit": 1.05,
        "num_of_undervoltage_violation_buses": 0,
        "voltage_lower_limit": 0.95,
        "max_line_loading": 1.0076,
        "max_transformer_loading": 1.448,
        "num_of_line_violations": 0,
        "line_upper_limit": 1.5,
        "num_of_transformer_violations": 0,
        "transformer_upper_limit": 1.5
    },
    {
        "name": "sb10_p12uhs0_1247_trans_301__p12udt1277__random__8__200",
        "scenario": "pf1",
        "stage": "Final",
        "upgrade_type": "Voltage",
        "simulation_time_s": 2.978032112121582,
        "thermal_violations_present": true,
        "voltage_violations_present": false,
        "max_bus_voltage": 1.0300000643769782,
        "min_bus_voltage": 0.9514491255976126,
        "num_of_voltage_violation_buses": 0,
        "num_of_overvoltage_violation_buses": 0,
        "voltage_upper_limit": 1.05,
        "num_of_undervoltage_violation_buses": 0,
        "voltage_lower_limit": 0.95,
        "max_line_loading": 1.0733,
        "max_transformer_loading": 1.542,
        "num_of_line_violations": 0,
        "line_upper_limit": 1.5,
        "num_of_transformer_violations": 1,
        "transformer_upper_limit": 1.5
    }
]

1. Why does it include line and transformer parameters?
2. Why did num_of_transformer_violations increase from 0 to 1? The thermal_summary.json file indicates that num_of_transformer_violations decreased from 4 to 0.