# \#transformer **URL:** https://forumautomation.com/tag/transformer/90.md [Latest](https://forumautomation.com/latest.md) · [Categories](https://forumautomation.com/categories.md) · [Tags](https://forumautomation.com/tags.md) --- ## [Which protective device detects gas accumulation caused by internal faults in a conservator-type oil-immersed transformer?](https://forumautomation.com/t/which-protective-device-detects-gas-accumulation-caused-by-internal-faults-in-a-conservator-type-oil-immersed-transformer/14547)
**Author:** [@TSRS](https://forumautomation.com/u/TSRS)\ **Replies:** 1\ **Last updated:** [October 27, 2026, 1:21pm UTC](https://forumautomation.com/t/which-protective-device-detects-gas-accumulation-caused-by-internal-faults-in-a-conservator-type-oil-immersed-transformer/14547 "2026-10-27T13:21:36Z")
Which protective device detects gas accumulation caused by internal faults in a conservator-type oil-immersed transformer? --- ## [POWER TRANSFORMER PROTECTION](https://forumautomation.com/t/power-transformer-protection/14548)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [October 27, 2026, 1:19pm UTC](https://forumautomation.com/t/power-transformer-protection/14548 "2026-10-27T13:19:57Z")
Understanding transformer protection schemes is essential for electrical engineers, substation engineers, and maintenance technicians. Key Power Transformer Protection Devices: Differential Protection (87T): Detects i… --- ## [IR Value Testing of Power Transformers](https://forumautomation.com/t/ir-value-testing-of-power-transformers/14542)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [October 26, 2026, 4:07pm UTC](https://forumautomation.com/t/ir-value-testing-of-power-transformers/14542 "2026-10-26T16:07:50Z")
IR Value Testing of Power Transformers Insulation Resistance (IR) testing is a critical diagnostic procedure used to assess the insulation condition of power transformers before commissioning and during maintenance. U… --- ## [Transformer Turns Ratio (TTR) Testing](https://forumautomation.com/t/transformer-turns-ratio-ttr-testing/14540)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [October 25, 2026, 7:12am UTC](https://forumautomation.com/t/transformer-turns-ratio-ttr-testing/14540 "2026-10-25T07:12:45Z")
Transformer Turns Ratio (TTR) Testing Transformer Turns Ratio (TTR) testing is an essential diagnostic test used to verify the turns ratio of power and distribution transformers. It compares the measured voltage ratio wi… --- ## [Why does Transformer Impedance important so much during a Fault?](https://forumautomation.com/t/why-does-transformer-impedance-important-so-much-during-a-fault/14532)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [October 23, 2026, 1:00pm UTC](https://forumautomation.com/t/why-does-transformer-impedance-important-so-much-during-a-fault/14532 "2026-10-23T13:00:56Z")
Why does Transformer Impedance important so much during a Fault? A transformer may be rated for hundreds of MVA, but its short-circuit impedance plays a critical role in determining the fault current. During a short … --- ## [Transformer Parallel Operation](https://forumautomation.com/t/transformer-parallel-operation/14494)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [October 9, 2026, 4:00pm UTC](https://forumautomation.com/t/transformer-parallel-operation/14494 "2026-10-09T16:00:38Z")
Transformer Parallel Operation --- ## [11 types of transformer faults and how to protect the transformer from these faults](https://forumautomation.com/t/11-types-of-transformer-faults-and-how-to-protect-the-transformer-from-these-faults/7718)
**Author:** [@ashlin](https://forumautomation.com/u/ashlin)\ **Replies:** 0\ **Last updated:** [January 14, 2020, 11:53am UTC](https://forumautomation.com/t/11-types-of-transformer-faults-and-how-to-protect-the-transformer-from-these-faults/7718 "2020-01-14T11:53:34Z")
What is a transformer A transformer is a device which helps with the transmission of electrical power, it is a static device without any rotating part and is totally enclosed. So the transformer plays a major role in th… --- ## [What happens when the pressure inside a power transformer suddenly rises?](https://forumautomation.com/t/what-happens-when-the-pressure-inside-a-power-transformer-suddenly-rises/14477)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [October 6, 2026, 3:40pm UTC](https://forumautomation.com/t/what-happens-when-the-pressure-inside-a-power-transformer-suddenly-rises/14477 "2026-10-06T15:40:39Z")
What happens when the pressure inside a power transformer suddenly rises? A transformer PRV is a vital safety device designed to protect an oil-filled transformer from excessive internal pressure. How does it work? Duri… --- ## [Tan Delta Testing](https://forumautomation.com/t/tan-delta-testing/14476)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [October 6, 2026, 3:38pm UTC](https://forumautomation.com/t/tan-delta-testing/14476 "2026-10-06T15:38:36Z")
Tan Delta Testing Tan Delta Testing: Early Warning System Before breakdown. Before outages. Before costly failures. Tan Delta reveals the truth about insulation health. What Tan Delta Really Measures? It tracks di… --- ## [Difference between OLTC and Off Circuit Tap Changer](https://forumautomation.com/t/difference-between-oltc-and-off-circuit-tap-changer/14457)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [September 30, 2026, 3:49am UTC](https://forumautomation.com/t/difference-between-oltc-and-off-circuit-tap-changer/14457 "2026-09-30T03:49:30Z")
Difference between OLTC and Off Circuit Tap Changer A transformer tap changer is used to adjust the effective turns ratio of a transformer and maintain the required output voltage. Depending on the application, transform… --- ## [IS vs IEC Transformer Tolerances](https://forumautomation.com/t/is-vs-iec-transformer-tolerances/14456)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [September 30, 2026, 3:26am UTC](https://forumautomation.com/t/is-vs-iec-transformer-tolerances/14456 "2026-09-30T03:26:55Z")
IS vs IEC Transformer Tolerances When evaluating a transformer, guaranteed values and specified tolerances are important during technical and commercial review. Total Losses IS 2026 and IEC 60076 both allow a tolera… --- ## [Transformer Losses](https://forumautomation.com/t/transformer-losses/14455)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [September 29, 2026, 2:19pm UTC](https://forumautomation.com/t/transformer-losses/14455 "2026-09-29T14:19:38Z")
Transformer Losses A transformer is a static electrical device that transfers electrical energy from one circuit to another through electromagnetic induction. However, some input power is lost as heat and other forms of … --- ## [IS 335 Transformer Oil](https://forumautomation.com/t/is-335-transformer-oil/14454)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [September 29, 2026, 1:50pm UTC](https://forumautomation.com/t/is-335-transformer-oil/14454 "2026-09-29T13:50:56Z")
IS 335 Transformer Oil IS 335 is the Indian Standard covering unused mineral insulating oil used in transformers and switchgear. Transformer oil provides electrical insulation, cooling, and reliable operation of electri… --- ## [Is it possible to connect two different transformers in parallel](https://forumautomation.com/t/is-it-possible-to-connect-two-different-transformers-in-parallel/9805)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\ **Replies:** 2\ **Last updated:** [September 28, 2026, 7:47am UTC](https://forumautomation.com/t/is-it-possible-to-connect-two-different-transformers-in-parallel/9805 "2026-09-28T07:47:55Z")
Can we connect two different transformers in parallel with the same voltage at their load and secondary side --- ## [How to Calculate Transformer Full-Load Current (FLC)?](https://forumautomation.com/t/how-to-calculate-transformer-full-load-current-flc/14441)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [September 24, 2026, 6:27am UTC](https://forumautomation.com/t/how-to-calculate-transformer-full-load-current-flc/14441 "2026-09-24T06:27:54Z")
Calculator Transformer Full-Load Current A simple calculation every electrical engineer, technician, and maintenance professional should know: How much current can a 1500 kVA, 3-phase transformer deliver at 415 V? Let… --- ## [What is the 80% rule for transformers?](https://forumautomation.com/t/what-is-the-80-rule-for-transformers/13887)
**Author:** [@TSRS](https://forumautomation.com/u/TSRS)\ **Replies:** 3\ **Last updated:** [September 17, 2026, 7:14am UTC](https://forumautomation.com/t/what-is-the-80-rule-for-transformers/13887 "2026-09-17T07:14:39Z")
What is the 80% rule for transformers? The 80% rule for transformers states that a transformer’s continuous load must not go above 80% of its rated capacity (nominal rating) to guarantee safety, efficiency and lifespan. … --- ## [How to calculate Transformer KVA Rating?](https://forumautomation.com/t/how-to-calculate-transformer-kva-rating/14335)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [August 21, 2026, 2:16pm UTC](https://forumautomation.com/t/how-to-calculate-transformer-kva-rating/14335 "2026-08-21T14:16:11Z")
How to calculate Transformer KVA Rating? Learn how to calculate the required transformer kVA rating using load power, voltage, current, and power factor. A quick guide for transformer selection and electrical system desi… --- ## [For what purpose do we use HVDC transformer?](https://forumautomation.com/t/for-what-purpose-do-we-use-hvdc-transformer/9391)
**Author:** [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\ **Replies:** 2\ **Last updated:** [August 19, 2026, 3:53pm UTC](https://forumautomation.com/t/for-what-purpose-do-we-use-hvdc-transformer/9391 "2026-08-19T15:53:40Z")
Where do we use HVDC transformer? --- ## [What is the Transformer Temperature Rise Test according to IEC 60076-2:2011?](https://forumautomation.com/t/what-is-the-transformer-temperature-rise-test-according-to-iec-60076-2-2011/14302)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [August 6, 2026, 1:01pm UTC](https://forumautomation.com/t/what-is-the-transformer-temperature-rise-test-according-to-iec-60076-2-2011/14302 "2026-08-06T13:01:46Z")
What is the Transformer Temperature Rise Test according to IEC 60076-2:2011? The Temperature Rise Test specified in IEC 60076-2:2011 is a routine type test used to verify that a power transformer can operate safely und… --- ## [Electrical Transformers Pre‐Commissioning Checklist](https://forumautomation.com/t/electrical-transformers-pre-commissioning-checklist/3685)
**Author:** [@sivaranjith](https://forumautomation.com/u/sivaranjith)\ **Replies:** 0\ **Last updated:** [May 24, 2018, 2:08pm UTC](https://forumautomation.com/t/electrical-transformers-pre-commissioning-checklist/3685 "2018-05-24T14:08:27Z")
Pre-commissioning tests are performed to ensure to the healthiness of the Transformer. Pre-commissioning tests start after oil filling process is completed. Various electrical tests are performed, they are listed below… --- ## [How do you size a Transformer and Generator correctly?](https://forumautomation.com/t/how-do-you-size-a-transformer-and-generator-correctly/14276)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [July 27, 2026, 1:02pm UTC](https://forumautomation.com/t/how-do-you-size-a-transformer-and-generator-correctly/14276 "2026-07-27T13:02:52Z")
How do you size a Transformer and Generator correctly? Proper transformer and generator sizing is essential for ensuring reliable power supply, energy efficiency, and future load expansion. An undersized unit can lead to… --- ## [How does Impedance affect Transformer Size?](https://forumautomation.com/t/how-does-impedance-affect-transformer-size/11980)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 3\ **Last updated:** [July 17, 2026, 2:42pm UTC](https://forumautomation.com/t/how-does-impedance-affect-transformer-size/11980 "2026-07-17T14:42:04Z")
How Does Impedance Affect Transformer Size? --- ## [Why is Nitrogen Gas used in Transformers?](https://forumautomation.com/t/why-is-nitrogen-gas-used-in-transformers/14233)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [July 7, 2026, 12:01pm UTC](https://forumautomation.com/t/why-is-nitrogen-gas-used-in-transformers/14233 "2026-07-07T12:01:54Z")
Why is Nitrogen Gas used in Transformers? Nitrogen gas acts as a protective blanket above the transformer oil, preventing moisture and humid air from entering the tank. Being dry and chemically inert, it minimizes oxida… --- ## [Transformer Factory Acceptance Test](https://forumautomation.com/t/transformer-factory-acceptance-test/14209)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [June 23, 2026, 7:59am UTC](https://forumautomation.com/t/transformer-factory-acceptance-test/14209 "2026-06-23T07:59:33Z")
Transformer Factory Acceptance Test • Measurement of winding resistance • Measurement of voltage ratio and check of phase displacement • Vector Group Test • Measurement of short-circuit impedance and load loss . •… --- ## [Transformer Differential Protection](https://forumautomation.com/t/transformer-differential-protection/14200)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [June 18, 2026, 5:36pm UTC](https://forumautomation.com/t/transformer-differential-protection/14200 "2026-06-18T17:36:13Z")
Transformer Differential Protection Differential Protection is one of the most important protection schemes used in high-voltage systems, particularly for power transformers and busbars in traction substations. Based on… --- ## [Transformer Cooling System](https://forumautomation.com/t/transformer-cooling-system/14196)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [June 15, 2026, 5:22am UTC](https://forumautomation.com/t/transformer-cooling-system/14196 "2026-06-15T05:22:43Z")
Transformer Cooling System The cooling system is one of the most important primary components of a power transformer. Transformer performance, Efficiency, Reliability & Service life are directly influenced by its abil… --- ## [How does Differential Protection work in Transformer?](https://forumautomation.com/t/how-does-differential-protection-work-in-transformer/12911)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [December 19, 2024, 3:24pm UTC](https://forumautomation.com/t/how-does-differential-protection-work-in-transformer/12911 "2024-12-19T15:24:20Z")
Working Principle of Transformer Differential Protection The current entering the transformer = The current leaving it (in normal conditions). When a fault occurs inside the transformer, this balance is disrupted, … --- ## [How to Choose a Transformer Based on Size and Selection?](https://forumautomation.com/t/how-to-choose-a-transformer-based-on-size-and-selection/13151)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [April 10, 2025, 9:50am UTC](https://forumautomation.com/t/how-to-choose-a-transformer-based-on-size-and-selection/13151 "2025-04-10T09:50:00Z")
How to Choose a Transformer Based on Size and Selection? Transformer sizing is essential for efficient and dependable power distribution in buildings & companies. Here’s a basic guide to help you recognize the differen… --- ## [Difference between WTI and OTI in a Transformer](https://forumautomation.com/t/difference-between-wti-and-oti-in-a-transformer/14184)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [June 8, 2026, 7:46am UTC](https://forumautomation.com/t/difference-between-wti-and-oti-in-a-transformer/14184 "2026-06-08T07:46:09Z")
Difference between WTI and OTI in a Transformer Parameter WTI (Winding Temperature Indicator) OTI (Oil Temperature Indicator) Full Form Winding Temperature Indicator Oil Temperature Indicator Measures Transform… --- ## [Temperature Rise Test in Distribution Transformer](https://forumautomation.com/t/temperature-rise-test-in-distribution-transformer/14121)
**Author:** [@Rabert](https://forumautomation.com/u/Rabert)\ **Replies:** 0\ **Last updated:** [May 26, 2026, 1:27pm UTC](https://forumautomation.com/t/temperature-rise-test-in-distribution-transformer/14121 "2026-05-26T13:27:45Z")
The temperature rise test is performed on a distribution transformer to determine the maximum temperature rise that occurs in the transformer during normal operation. This test is important as it helps to ensure that th… [Next page](https://forumautomation.com/tag/transformer/90.md?match_all_tags=true&page=1&tags%5B%5D=transformer)