Hi, i have a question about a transformer/inductor i am curious about, pictured below. It seems to have 2 coils on a laminated closed U core. The nameplate says 'transformer', but is used as a inductor/reactor. The two coils seem to be connected in series. Does these setup have 'special'...
Below is a circuit consisting of a current limiting reactor (L1), and a current transformer (T1) whose outputs are connected to two 3-phase diode bridges (R1 & R1). The bridges are series connected to a RL load.
What is the purpose of the CT? It seems to shift the current 180 degrees...
Hi, i managed to obtain some information about a special wound CT used in a compound-source static excitation system. There was a 'nameplate' located on the back of the CT, which in turn was directed to the wall. It seems the wound CT has one primary and 2 secondary coils. The primary has 3...
Hi, at my work we got a 70kV Delta-Zigzag transformer that i am currently analysing. The primary side is 3.3kv, the secondary is 400V and the vector group is Dzn0 (Delta-zigzag + neutral(grounded) 0 phase shift). The primary is connected to a generator (wye connected) and the secondary is...
Hi, i want to plot the secondary current of a 1500:5 CT on a Yokogama Portable Hybrid recorder. I thought of using a 1 ohm 50W burden resistor on the CT, and then rectifying the voltage over the resistor which would be put in the recorder. The recorder accepts voltages up to 50V dc.
The...
Hi,
I am currently using EWB Multisim and MATLAB SimPowerSystems for simulating an generator excitation system, and I'm not satisfied with both.
Multisim doesn't have the necessary models, like three phase (dela-zigzag) transformers. It also produces inexplicable errors when i try to build...
Hi,
I want to simulate a compound-source excitation system for three-phase generators in SymPowerSystems (diagram below). It basically consists of a power potential transformer and a power current transformer that provides the field current. I am actually a Matlab novice, and i'm stuck with a...
Hi,
I simplified things a bit more since my last. I removed T1, which in my view only provides 3 more phases.
An SCT/PPT application note from Basler says the following:
"The power current transformers were inserted into the
generator output via the neutral side of the machine one
for each...
Hi,
I am currently analysing the schematics of a static exciter of a 5MW generator (which i combined below), and i'm stuck with several questions.
Firstly,it appears to be a compound source exciter, which provides the voltage and current to the rotor field. It consists of a current...
Question 1: How can a reactor (inductor) limit short circuit current?
Question 2: How can i do a QnD measurement of the inductance of the reactor without use of expensive DMMs?
Hi,
I at my work we got a static exciter for the rotor field
of our 5.5 MW generator. The exciter appears to be of
the 'compound' type e.g. potential + current transformer
shunted. The current transformer below is very unlike the
transformers i have seen before (the coil around the
wire). It...
