grounding neutral of station auxiliary system
high impedance (resistance) grounding with alarm protection. Neutral is connected to ground through a resistance or impedance which limits the fault current to ground very low values (less than 10 A). In this approach, the circuit can remain...
thread576-305704
you can use block Powergui from Powerlib. From menu Tools of Powergui,select Initial state settings.
see SimPowerSystems guide Analysing a simple circuit ((p. 1-9)
the transformer auxiliary service of a hydroelectric power plant 13.8/0.44kV-3.5MVA, Delta / star grounded was protected by a 87 as main protection. Later was added another transformer 13.8/13.8kV-6.5MVA, Delta / star grounded using the same 87.
13.8kV delta sides are connected at same source...
4.9.2.2 Tripping modes
Both the unit transformer and the UAT fault pressure relays should be connected to lockout relays that are separate from the lockout relays connected to the differentials. In some system configurations, these lockout relays trip the main generator and field and/or exciter...
I just bought the IEEE GUIDE FOR AC GENERATOR PROTECTION Std C37.102-2006. The novelty is the use of multifunction relay.
I'm referring to items in bold below, Figure 6-3.
1- Are there two independent panels to MGPS #1 and MGPS #2?
2- What does it means simulltaneous trip #1 and #2 , unit...
Our standard is floating DC batteries.
Bseide this, structures of batteries room are isolated floor through insulators and the system is isolated from ground.
Is it necessary that insulation?
Kimbark published the book Direct current transmission - Volume I
There was an attempt to publish Volume II. This book would address among others:
- Operation of the DC link as part of an AC system
- Asynchronous ties
- Models and simulation
1 - Volume II was published?
2 - you know any...
by convention, relays in elementary diagram represents contatcs position with not-energized coil. So,
27-eletromechanical relay is represented by NC contact in the elementary diagram
27-digital relay needs a DC source to be ready for operation.
Without DC source relay contact is Normally...
During a load rejection governor automatically switch its operation mode to "Isolated Network" with a speed control mode, and start closing the Distributor.
The dynamic response of regulators speed is slower than the rate of increase of speed of generators s (Approximately 8% / s).
2 things...
after a load rejection, the system separates from the powerplant, but generators remain synchronized to busgeneration in speed no load.
1-will be possible to synchronize the busgeneration with system keeping all generators connected?
2 - Is it feasible?
Our criteria for CT secondary cable shield grounding is:
- For power house: cable shield grounded at the one ends.
for outdoor substation: cable shield grounded at the two ends.
The route of the CT secondary cable is not straight from CT to relay. There are intermediate terminals.
The...
In a system restoration after a black-start, it is necessary that the power plant will be connected to a system substation through a transmission line of 110km.
The synchronization equipment and synchronization circuit breaker are installed in the system bus running distant 110 km away from...
the book of electrical engineering most practical and comprehensive that I know is the Transmission & Distribution of Westinghouse of 1964. This book was reprinted by ABB but there was no update.
My question: Is there a book with the same standard as the TD but more modern and current?
during the comissioning of a submerged generator and impellers , bubble turbine, was realized the generator motoring:
the motoring was in the range of -100% power, ie, a machine 80 MW, a received power of approximately reverse in the turbine-130MW.
