Answer / dale bergemann

RTD is Resistance Temperature Detector. It will change resistance at its leads when the sensor is exposed to changing temperature. They are commonly found in windings of motors or surfaces of bearings or immersed in liquid to produce a resistance when converted by a monitoring device can indicate degrees in the medium it is placed.
A lead wire is place on each side of the sensor and the resistance can be measured across those two leads, commonly Red and White in color. Because it measures ohms, the value will be affected by the length of the leads, which will 'bias' the reading and convert incorrectly. To address this, a third wire can be added in parallel with the white wire. Now the monitor measures the resistance between and R & W and compensates it with the resistance measured between the two white wires. Now we have the true resistance change of the sensor, without the error caused by lead length.
They also make 4 wire RTDs which have two Red and two White leads to further enhance capability and increase accuracy by analyzing in a bridge fashion.

In a synchronous machine if the field axis is ahead of the armature field axis then the machine is ?

1 Answers  

---

What do you mean by ACB and VCB?

3 Answers   L&T,

---

why motor rating in KW?

2 Answers  

---

how to calculate the current if i know power in MW and voltage 11kv/415v and also want to know that incoming cables for trnsformer

6 Answers   Daikin, KOC, Reliance,

---

what is the d/f b/w dol & star delta starter.

2 Answers  

---

how can we solve the RMS value of alternative Qnty is .707 , explain detail .

2 Answers  

---

What shall be the minimum distance to be maintained between two power cable in a common trench?

3 Answers  

---

What is the difference between bundled conductors and double circuit?

1 Answers   Power Grid,

---

What is Phase to Phase clearance for 800V System Operating Voltage as per IEC61439

0 Answers  

---

factor to be considered for bus bar design

0 Answers  

---

When and where resistance earthing is used ? How to calculate the time constant for earth fault

0 Answers  

---

say a transformer is designed for 33/11kv step down with ratio 0.33 for load 1 mva. if am giving 11kv as a input that same transformer what will happen to its o/p voltage. and whether it can be operated for 500kva

4 Answers  

---