Abstract: Electrical power system sensor devices, electrical power system monitoring methods, and electrical power system monitoring systems are disclosed according to some aspects of the description. In one aspect, an electrical power system sensor device includes sensor circuitry configured to monitor a characteristic of electrical energy which is conducted using an electrical conductor of an electrical power system, an attachment assembly configured to position the sensor circuitry with respect to the electrical conductor wherein the sensor circuitry monitors the characteristic of the electrical energy which is conducted within the electrical conductor of the electrical power system, and wherein the sensor circuitry is electrically isolated from the electrical conductor of the electrical power system.