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what is the difference between PTC & PT100 their function and connecting way ?

- PT100 is an RTD (Resistance Temperature Probe) made of Platinum metal which has a resistance value of 100 ohms at zero degrees celsius. - PTC (Positive Temperature Coefficient) and NTC (Negative Temperature Coefficient) are both types of Thermistor. NTC have resistance that decreases with...

What is the definition of ANSI 50N/51N or 50G/51G - Earth fault?

Earth fault protection based on measured or calculated residual current values: ANSI 50N/51N: residual current calculated or measured by 3 phase current sensors ANSI 50G/51G: residual current measured directly by a specific sensor.

Please send me the X/R ratio of transformer for 1600kVA Trihal transformer?

The X/R ratio for the 1600kVA Trihal transformer can be calculated using the Trihal electrical characteristics (impedance & losses data) given normally in transformer datasheets (attached ) values given in transformer datasheet: -Load losses in Watts (at 75 C), -No-load losses in Watts, and...

What is the service breaking capacity and what is the advantage of that on the reliability of breaker?

In a correctly designed installation, a circuit-breaker is never required to operate at its maximum breaking current (Icu). For this reason, a new characteristic has been introduced which is the rated service short-circuit breaking capacity (Ics). IEC 60947-2 expresses (Ics) as a percentage (25,...

What is a 1 or a 2 gang light switch?

"Gang" describes the number of switches on the plate. They are sometimes called rockers, throws or dimmers, depending on how they operate, but still they just refer to the number of light switches on the plate. It is possible to get more, but it is very uncommon to have more that three in a...

What is meant by vector group for transformers and why is it important?

What is vector group for transformers? A vector group is the International Electrotechnical Commission (IEC) method of categorizing the high voltage (HV) windings and low voltage (LV) winding configurations of three-phase transformers. The vector group designation indicates the windings...

What is the difference between type A & AC class RCCB ?

In Class A (Tripping is ensured for sinusoidal, alternating residual currents as well as for pulsed ,DC residual currents, whether they are quickly applied or slowly increased. Application: loads with electronics, rectifiers, and instruments.) Class AC Tripping is ensured for sinusoidal,...

How to calculate earth fault loop impedance value (Zs) ?

the Breaker Earth Loop Impedance (Zs) is calculated as follows; Zs = Uo / Ia Where Uo is the voltage to earth and Ia is the current to trip the breaker in a given breaker disconnection time. Usually we consider two breaker disconnection times: 5 seconds and 0,4 seconds, depending of the...

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Popular Video FAQsPopular Videos
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Learn more through our Generic Knowledge FAQsGeneral Knowledge
What is meant by Symmetrical and Asymmetrical breaking currents?

issue: Customer wants to know the value of the symmetrical and asymmetrical breaking current of the circuit breaker and what do they mean. Environment: Circuit Breaker Resolution: - Symmetrical breaking current is the RMS value of AC component of short circuit current at the instant of separation...

Apa alternatif replacement battery UPS SURT15KRMXLI jika APCRBC140 tidak ready stock?

Apa alternatif replacement battery UPS SURT15KRMXLI jika APCRBC140 tidak ready stock? ======================================================================= Untuk alternatifnya bisa menggunakan battery pack type SURT192XLBP sebanyak 2 sets, karena didalam 1 set SURT192XLBP terdapat 2 sets battery...

In a 3 phase system, why does the meter still show voltage reading on one of the phases even after breaking the phase circuit?

Issue: Testing phase loss on a meter doesn't result in a null voltage reading. Environmnet: EasyLogic Series Power Meters PowerLogic Series Power Meters Resolution: The voltage seen is what we call "phantom voltage", its a known phenomenon with all high impedance power meters. These phantom...

What is Power Factor Correction (PFC) - Does it help conserve energy?

Issue: What is Power Factor Correction (PFC) - Does it help conserve energy? Answer: Power Factor Correction (PFC) doesn't directly reduce the overall electric consumption of a device or system, but it does play a role in optimizing the efficiency of electrical systems, which can indirectly lead to...

Which RL(lead resistance from CT to relay) is to be used in Knee Voltage calculation if Current Transformers (CTs) used in High Impedance Restricted Earth...

Issue: Having two different values for RL ( Lead resistance from the CT to the relay); RL from the phase CT to the relay and RL from the neutral point CT to the relay Environment: Protection Function ANSI 64ref High impedance differential Sepam 80 Current Transformer requirement Resolution: In any...

What is an Electrical "Ground Loop" - How does it affect my equipment?

Issue: What is an electrical "ground loop" and how does it affect my equipment? Environment: Ground loops can occur in any situation where multiple electrical devices are interconnected, especially when those devices are powered from different sources or located in different places with varying...

Voltage, Current and Resistance Explained

Issue: How do I remember the relationship of voltage, current and resistance in an electrical system? Environment: N/A Solution: Voltage (unit of measurement - volt) is like the water pressure in the pipe. When you turn on a faucet, the water pressure makes the water flow out. Similarly, voltage...

What is the selection criterion of Circuit Breakers for the Capacitor bank application.

The selection should be done after derating the Circuit Breaker taking into consideration voltage variation and capacitors tolerances that could increase nominal current up to 1.5In. The Derating factor of 1.5In Where In = Q/ ( Square root of 3 ) Un Q = Capacitor Power Un = Nominal Voltage...

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