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What is solkor r?
solkor r is a form of unit (cable, switch, transformer etc) protection for high voltage systems and works by sensing a voltage inbalance between either end of the unit (using current transformers and summation transformers) by doing this it will sense a fault in its own unit and isolate the fault, it will not however sense a fault flowing through it from another unit and therefore maintaining a supply. especially useful in ring systems.
Briefly define the monoalpabetic cipher?
A monoalphabetic cipher uses fixed substitution over the entire message, whereas a polyalphabetic cipher uses a number of substitutions at different positions in the message, where a unit from the plaintext is mapped to one of several possibilities in the ciphertext and vice versa.
How to calculate fault current for transformer?
The fault current of a power transformer will depend on the following; Transformer Rating (in KVA/MVA) per unit impedence of the transformer (%p.u.) line/phase Voltage (VL/VP) the following formula can be used to find the fault current on the secondary side of a transformer Fault Current = Transformer Rating /(per unit impedance x phase voltage) The Values of Transformer Rating, per unit impedance & phase/line voltage will usually be mentioned on the transformer rating plate / data sheet As an example a 500kVA, 11kV/400V/3-Phase/50Hz transformer with 5% p.u impendence will have the following fault levels on the secondary side Fault level = 500/(5%)=10000kVA S=1.732 * VPP * IP Fault current = 500/(5% x 400 x 1.732) = 14.4 kA Remember to use 3phase voltage!
How do you calculate cable distance using farads?
All underground cables have relatively high values of capacitance, due to the close proximity of their cores and earthed (grounded) metallic sheath. Manufacturers provide data for their cables, which express their capacitance in terms of capacitance per unit length, e.g. microfarads per metre.Certain categories of underground cable-fault can be located by measuring the capacitance (using an appropriate bridge circuit) of the healthy section of the cable then, having determined the capacitance per unit length for that type of cable, measuring-off the distance along the cable route to the fault position.
What is generator transformer unit switching?
Generator transformer unit switching refers to the process of connecting or disconnecting generator-transformer units in power systems. This operation is critical for managing the flow of electricity, ensuring stability, and protecting equipment during maintenance or fault conditions. Proper switching techniques help maintain the reliability of power generation and distribution, allowing for effective load management and minimizing disruptions in service.
What is unit substitution in fault finding?
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What is unit substitution when fault finding with electrics?
Unit substitution in fault finding with electrics involves replacing a suspected faulty component with a known good one to determine if the issue lies within that component. This method helps isolate the fault by eliminating variables and allows for a systematic approach to diagnosing electrical issues. By substituting units, technicians can quickly identify whether the problem is due to the specific component or if the fault lies elsewhere in the system. This technique is commonly used in troubleshooting electrical circuits and devices.
What is unit substitution?
Unit Substitution : Remove suspect part and fit ‘known working’ spare.
Describe the various fault location techniques that can be used and how they are applied such as half split input to out put function testing unit substitution and equipment self diagnostics?
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What is the unit for finding a circumference?
The unit for a circumference is the same as the unit for length (or radius or diameter).
The dip of a unit represents what?
The dip of a unit represents the angle at which the bed inclines from the horizontal. In dip-slip faults, the fault blocks move up and down, parallel to the dip of the fault plane.
What is the unit of measurement for finding the capacity?
mL and L
Which of the testing technique immediately follows the unit testing?
module testing
What is general technique that you use for debugging a pl sql unit?
dbms_out
What is solkor r?
solkor r is a form of unit (cable, switch, transformer etc) protection for high voltage systems and works by sensing a voltage inbalance between either end of the unit (using current transformers and summation transformers) by doing this it will sense a fault in its own unit and isolate the fault, it will not however sense a fault flowing through it from another unit and therefore maintaining a supply. especially useful in ring systems.
What is the basic metric unit for finding mass called?
kilogram
Which of the testing technique immediatle follow the unit testing?
sub system testing
