Analyzing the Efficiency of Neutral Treatment with Resistor and Shunt Circuit Breaker in a MV Distribution Substation

Modeling of operating modes of relay protection in electrical networks with insulated neutral

“…The maximum single-phase earth fault current occurs when the network gets the maximum total length of connections. This mode is typical for the post-emergency mode of the substation, that is, when the automatic transfer switch is triggered or the sectional switch is deliberately turned on by the operating personnel [10].…”

“…In this case, any device start-up, arrival of a discrete signal, detection of an internal malfunction is recorded in the event memory with the assignment of the date and time of the moment of detection. The ability to record the presence of faults in the event archive is a very useful function for a substation without permanent personnel on duty [10].…”

Impact analysis of changing the neutral treatment solution in an MV electrical station on the system performance

“…Failures over 3 minutes are due to internal causes that could have been avoided: rehabilitation of electrical lines, insulation maintenance and equipment, and incorrect correlation of protection systems between the user and the distributor (DEO) [1].…”

“…Vulnerability has been analyzed on the basis of risk and impact concepts. In this sense, evaluation matrices have been defined and proposed according to the number of affected consumers, the duration of the remediation and the probability of occurrence of a defect [1]. Analyzing the statistical data related to the events occurring in the stoma station for a period of about 2 years before 2017 and studying the behavior of the resistor treatment method in the same period [3], it was proposed to modify the neutral treatment solution by switching to the coil treated with the suppression coil, solution implemented since September / October 2017.…”

“…Distribution companies that activates in Romanian energy field used in our days a global polity to improve the power distribution and security service, concerning the users supplying, according to the new standards in this field provided by the Romanian Energy Regulatory Authority order number 11/2016, modified and completed by order 47/2017 [1], [2].…”