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Already a member? Close this window and log in. Join Us Close. Are you an Engineering professional? Join Eng-Tips Forums! Join Us! By joining you are opting in to receive e-mail. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Students Click Here. Related Projects. The normal line to ground capacitive charging current for one phase is the line to neutral voltage divided by the capacitive reactance in ohms.

When one of the phases is grounded, the total system charging current is 3 times normal phase to ground current. During a fault on one of the phases in a feeder, and the voltage on the other phases stepped up 1. I would say 1. Then when you get a fault your charging current on the high phases increases to 1. But this is unbalanced 3 phase feeder free download ground, so I would think I would see 1.

I had a false trip on a resistively grounded system with sensitive ground line differential protection. The ground differential was set lower than this unbalanced charging current, so I bumped читать up.

This was my best guess, but perhaps there is a large flaw in my reasoning, please feel free to point it out. Are you considering here the currents in an unloaded feeder during a fault on another feeder connected to the same busbar? One amp [for V] but all the experts say it needs to be empirically verified. Check for absence of neutral-shift voltage, then do the current measurement.

See: www. Since the resistor is placed in the neutral of the transformer, the zero-sequence current will flow through it. As a result, that current makes the apparent resistance of the grounding resistor appear to be three times as large. General references. Comment on the previous posting paper. The medium voltage high resistance system grounding usually uses a single phase distribution transformer with the resistor and relaying on its secondary to 3 phase feeder free download the medium voltage to propagate 3 phase feeder free download the relaying circuits.

Suggestion: Draw a circuit diagram that would include for example: 1. Delta – Wye transformer 2. Downstream circuit breaker 3. Transmission line 4. 3 phase feeder free download line capacitances to ground 5. High-resistance distribution transformer in the transformer wye grounded neutral 6. Ground fault, e. Red Flag This Post Please let us know here why this post is inappropriate.

Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Learn methods and guidelines for using stereolithography SLA 3D printed molds in нажмите чтобы перейти injection molding process to lower costs and lead time.

Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now. This ebook covers tips for creating and managing workflows, 3 phase feeder free download best practices and protection of intellectual property, Cloud vs. Close Box. Log In Come Join Us! Http://replace.me/16183.txt Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden.

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