All redundancy protocols are available in the same device and can be selected by setting. High-speed, three-system differential protection Easergy MiCOM P63x provides high-speed, three-system differential protection using a triple-slope characteristic and two high-set differential elements in combination with transformer inrush restraint, overfluxing restraint and through-stabilization. Major enhancement to cybersecurity The Easergy MiCOM P63x range has operational and cybersecurity features, compliant with IECthat help protect installations with security based on embedded features such as arvea based access control RBACport hardening, security logs and access traceability. Features The Easergy MiCOM P63x series provides fast and selective differential protection with optional hardware and software features to satisfy your individual needs.
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This is done to show the individual test function of DTOC. Now, increase the load current by decreasing the rheostat load. It works on the principle that, if the current measured by the CT goes above the threshold then according to selection of operation characteristic the relay will send the trip signal.
For each IDMT function, a setting parameter is provided for this assignment by the user. That means as the value of current goes above 0. Introduction and scheme of under and over voltage protection of Transformer: The two stage voltage-time protection function of the p63x evaluates the fundamental wave of the pulse voltage.
The p63x checks the voltage to determine whether it exceed or falls below set threshold. The triggers are followed by timer stages that can be blocked via appropriately configured binary signal inputs. If the decisions of under voltage monitoring are to be included in the trip Commands, then it are recommended that transient signals be used. Otherwise the trip command would always be present when the system voltage was disconnected, and thus it would not be possible to close the circuit breaker again.
Here we do not have a three transformer or a PT connected to transformer. Hence we have used auto-transformer for simulation purpose. Here the setting is multiple of Vnom voltage. This voltage is set by software, means we can set this value according to the PT secondary available.
Thought here we do not have a PT so we have set this standard value to volt. Here there is setting of Vnom PT sec. We can change it according to the option available in that menu and hence make our further setting accordingly for trip command.
So this means, if we set the threshold of 0. This means if anyhow the voltage dips beyond 44 volt then the relay will give out the trip signal after the set time or even instantaneously.
For both the features we have kept the time as 5 seconds. Procedure for checking transformer over and under voltage protection scheme Connect the auto-transformer output between pin 1 and pin 4 of X Now before energizing the circuit, energize the auto-transformer and set the voltage anywhere between 44V to 77V.
You will notice the relay and circuit in healthy state. Now for testing over voltage feature, slowly increase the voltage knob such that it crosses 77V.
As soon the threshold is crossed after 5 second, the relay will send the trip signal and visual indication will also be seen. Similarly follow procedure from first step after clearing the fault and test for under voltage. Introduction and scheme of over fluxing protection of transformer: The P63X checks the voltage to detect whether it exceeds or falls below set threshold. The frequency is determines from the difference in a time between the zero crossing of the voltage.
The voltage is the one that is measured by PT and send to relay at its terminal. As for simulation purpose we are using a single phase transformer, the frequency is constant.
The input for this is also the same terminal where we have given supply for under voltage protection. The PT secondary voltages are tested for the given protection and will acts accordingly. Now push the green button and the circuit energize. If the voltage level is increased by 1 volt, immediately we can see the visual indication of protection of function and the alarm LED flashing. When this crosses the threshold for trip signal then the relay sends the trip command exactly after the pre set delay time.
Meaning above 2. Now if the value of the ratio goes above 2. The major operating challenge to transformer differential protection is maintaining security during CT saturation for external faults while maintaining sensitivity to detect low magnitude internal faults. CT saturation reduces the secondary output from the CT, and cause a false differential current to appear to relay.
We have also faced a problem i. Relay calculates differential current in multiples of Ire which is based on MVA rating. So we have to set Ire equal to 1 and we have to set Vmin to As a result we always get better results for protecting the transformer by using numerical relay MICOM P rather than using an electromechanical relays.
Samugal aareva The devices also incorporate many supplementary protective backup functions. Browse services Field Services Optimize the life cycle of your assets, improve performance, safety, and reduce maintenance costs — all with an experienced provider of complete field services and a partner you can trust. Easergy MiCOM P63x Schneider Electric Next, discover our energy and sustainability services, including big data management, to turn this vision into your business reality. All redundancy protocols are available in the same device and can be selected by setting.
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