Protection - Electrical Riddle

This forum has 102 topics, 192 replies, and was last updated 7 months, 3 weeks ago by vahid.

Viewing 102 topics - 1 through 102 (of 102 total)

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- Last Post
- Inter-trip circuit monitor and supervision
  Started by: محمد سعید جعفرپور
- 2
- 2
- 7 months, 3 weeks ago
  vahid
- Protection riddle no. 10 – Differential protection and auto transfer system
  Started by: Hamid
- 2
- 7
- 7 months, 3 weeks ago
  vahid
- Diesel Generator earth fault protection
  Started by: محمد سعید جعفرپور
- 1
- 1
- 1 year, 6 months ago
  محمد سعید جعفرپور
- Protection Riddle No.42 – Spasmodic tripping on the RCD
  Started by: Brian Thurlborn
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection riddle No.74 – REF Protection on 2MVA Transformer
  Started by: Manish Naha
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.21 – Secondary grounding protection
  Started by: EHSAN
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.53 – Setting of phase unbalance protection (46,47)
  Started by: Gustaw
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.85 – Standby earth fault protection
  Started by: Unknown
- 1
- 1
- 3 years, 8 months ago
  Guest
- Protection question No.31 – Substation fire protection
  Started by: Habibi
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.64 – 5th harmonic in differential protection
  Started by: Mohammad
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.96 – Busbar differential protection
  Started by: george.v.sebastian
- 1
- 2
- 3 years, 8 months ago
  Talha
- Protection Riddle No.11 – Earthing point location
  Started by: Hamid
- 1
- 6
- 3 years, 8 months ago
  Abdul Hameed Pathiyil
- Protection Question No.43 – Alternator out of step protection
  Started by: Yogi
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.75 – CT Equipotential connection
  Started by: Abdul Hameed
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.22 – DC Voltage Selection
  Started by: Ahmad
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.54 – Measuring of 7th voltage harmonic
  Started by: Hamid
- 1
- 1
- 3 years, 8 months ago
  AMIR KHASHAYAR
- Protection Riddle No.86 – 4-pole ELCB Operation
  Started by: asad
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.1 – The saving fuses
  Started by: Hamid
- 1
- 4
- 3 years, 8 months ago
  iqbal
- Protection Question No.33 – Bus coupler protection
  Started by: MONICA MAHLANGU
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.65 – REF low impedance protection
  Started by: ASAD
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.97 – Short circuit current limiter
  Started by: george.v.sebastian
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.12 – Inability of Earth fault protection system
  Started by: Hamid
- 1
- 12
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.44 – Bad designing of protection circuit and disastrous accident in power plant
  Started by: Hamid
- 1
- 3
- 3 years, 8 months ago
  Scoota
- Protection Riddle No.76 – Neutral CT rating
  Started by: Deepa
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.23- Generator protection system mal-operation
  Started by: Hamid
- 1
- 1
- 3 years, 8 months ago
  AMIR KHASHAYAR
- Protection Question No.55 – Motor overvoltage capability
  Started by: Reza
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.87 – Station transformer protection
  Started by: Anirudh patel
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection riddle No.2 – Stability of transformer differential protection
  Started by: Hamid
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Question No.35 – Transformer secondary side protection from primary
  Started by: FARHAN RAZA
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.66 – Difference between low impedence REF and high impedence REF
  Started by: Radhakrishna hn
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.98 – Grading time of numerical relays protection
  Started by: soman
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.13 – Setting of earth fault relay
  Started by: Hamid
- 1
- 9
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.45 – Relay setting of new feeders
  Started by: Ahmad
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.77 – Restricted Earth Fault Trip due to inrush current
  Started by: Sreelatha
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection question No.24 – CT secondary
  Started by: bipul pandey
- 1
- 2
- 3 years, 8 months ago
  Dinesh Deshmukh
- Protection Question No.56 – REF Induction Relay
  Started by: Nitin
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.88 – High impedance protection CT Mis-match
  Started by: Addis
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection riddle no.3 – Short line between power plant and substation
  Started by: Hamid
- 1
- 5
- 3 years, 8 months ago
  Hamid
- Protection question No.34 – Motor thermal time constant
  Started by: AFRA
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Quastion No.67 – Solid State Relays
  Started by: Nitsworld
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Relay No.99 – Why REF is set to time delayed tripping?
  Started by: Why
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.14 – Earth fault relay setting
  Started by: GUEST
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.46- Difference between 50N and 50G
  Started by: Alfredo
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.78 – Generation of hidrogen gas in Power Transformer
  Started by: Gajjala Sreelatha
- 1
- 6
- 3 years, 8 months ago
  Sreelatha
- Protection question No.25 – NGR earth fault protection
  Started by: bipul pandey
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.57 – Protection of two power transformer with one relay
  Started by: Hamid
- 1
- 2
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.89 – Lightning Protection for Generator Transformer
  Started by: Purnendu Pradhan
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection riddle no.4 – Earthquake in nuclear power plant
  Started by: Hamid
- 1
- 0
- 3 years, 8 months ago
  Hamid
- Protection Question No.36 – SF6 CB
  Started by: Mohammed
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No. 68 – Calculation of eartfault in distribution feeders
  Started by: Tag
- 1
- 1
- 3 years, 8 months ago
  Guest
- Tertiary Load and Differential Unbalancing
  Started by: Guest
- 0
- 0
- 3 years, 8 months ago
  Guest
- Protection Riddle No.15 – Generator Protection
  Started by: T.Kailash Kumar
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.47 – Earth fault setting calculation
  Started by: abbas
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.79 – Surge protection devices
  Started by: Sinnadurai Sripadmanaba
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.26 – Industrial heater protection system
  Started by: Hamid
- 1
- 0
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.58 – Transformer biased differential protection
  Started by: Nitin chavda
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.90 – Directional Earth Fault testing
  Started by: Pramod
- 1
- 2
- 3 years, 8 months ago
  V.K.Nambiathiri
- Protection riddle no.5 – The protection system false operation
  Started by: Hamid
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.38 – Restricted earth fault protection and Inrush current
  Started by: Hamid
- 1
- 4
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.69 – G.59 In Diesel Generator System
  Started by: Rahim
- 1
- 1
- 3 years, 8 months ago
  Guest
- Protection Question No.16 – Restricted Earth Fault
  Started by: T.Kailash Kumar
- 1
- 4
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.48 – Earth Fault on motor starting
  Started by: Brett Welsh
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No. 80 -Protection of TV,Radio,Telephone during thunderstorm
  Started by: Sinnadurai Sripadmanaba
- 1
- 2
- 3 years, 8 months ago
  Bipul pandey
- Protection question No.27 – Circuit breaker choosing
  Started by: NADER
- 1
- 2
- 3 years, 8 months ago
  Ram
- Protection riddle No.59 – Low and High impedance differential protection
  Started by: Ashkan
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.91 – Opertaion of stuck breaker protection with outgoing feeder faults
  Started by: Guest
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection riddle no.6 – Overcurrent protection with two CT
  Started by: VATKARI from INDIA
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.37 – Generator protection
  Started by: Guest
- 1
- 2
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.70 – Transformer differential protection commissioning
  Started by: Sara
- 1
- 1
- 3 years, 8 months ago
  Guest
- Protection Riddle No.17 – Undervoltage Protection – Minimum Voltage
  Started by: GUEST
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection question No.49-Transformer internal fault protection
  Started by: Shital
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.81 – Frequency of surges and impulses
  Started by: Sinnadurai Sripadmanaban
- 1
- 2
- 3 years, 8 months ago
  Jagadish subbaramaiah
- Protection Riddle No.28 – Current transformer over voltage
  Started by: NASER
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.60 -Role of resistor in high impedance REF
  Started by: alireza
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.92 – REF Protection
  Started by: Soman
- 1
- 2
- 3 years, 8 months ago
  V.K.Nambiathiri
- Protection riddle no.7 – Transformer Vector Group
  Started by: UKB from CANADA
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.39 – Dead machine protection
  Started by: YOGI
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.71 – Current Transformer's Safety Class
  Started by: Guest
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.18 – Generator Stator Earth-Fault Protection at Low Frequency Injection
  Started by: GUEST
- 1
- 3
- 3 years, 8 months ago
  Hamid
- Protection Question No.50 – Protective relays and system harmonics
  Started by: Bahula
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No. 82 – Contacts in light switches
  Started by: Sinnadurai Sripadmanaban
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.29 – Contact melting
  Started by: Bita
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.61- CT saturation
  Started by: alireza
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.93 – High speed bus bar differential proetection
  Started by: SOMAN
- 1
- 1
- 3 years, 8 months ago
  Unknown
- Protection riddle no.8 – Risk of operation in power plant
  Started by: Hamid
- 1
- 11
- 3 years, 8 months ago
  BALAJI
- Protection Question No.40 – Reverse KVAR relay
  Started by: Ahmed
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.72 – Earth Fault
  Started by: Bashir Varsi
- 1
- 2
- 3 years, 8 months ago
  BEHNAM
- Protection Riddle No.19 – Interposing VT in synchronising circuit
  Started by: GUEST
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.51 – CT Primary Injection
  Started by: Rohana
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.83 – Stabilizing Resistor for Residual Earth Fault scheme
  Started by: Claudio
- 1
- 3
- 3 years, 8 months ago
  Claudio
- Protection Riddle No.30 – Reliablity or Availability
  Started by: Hamid
- 1
- 0
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.62 – Grounding of primary side of transformers
  Started by: Hamid
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.94 – Functioning of Oil surge Relay
  Started by: Unknown
- 1
- 1
- 3 years, 8 months ago
  Unknown
- Protection Riddle No.9 – Trip relay mal-operation
  Started by: Hamid
- 1
- 2
- 3 years, 8 months ago
  Hamid
- Protection riddle No.41- Differential relay setting calculation
  Started by: Yogi
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection riddle No.73 – Motor protection
  Started by: H.S
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.20 – Single phase earth fault
  Started by: GUEST
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.52 – Restricted earth fault protecton for transformer
  Started by: Nitin
- 1
- 2
- 3 years, 8 months ago
  alireza
- Protection Riddle No.84 – Operating time of protective devices
  Started by: V.K.Nambiathiri
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Question No.32 – Directional overcurrent
  Started by: atiqun nabi
- 1
- 1
- 3 years, 8 months ago
  Hamid
- Protection Riddle No.63 – Over Design Restricted Earth Fault Protection
  Started by: Hamid
- 1
- 1
- 3 years, 8 months ago
  amir khashayar
- Protection Riddle No.95 – Field excitation of Synchronous Generator
  Started by: rakesh kumar
- 1
- 2
- 3 years, 8 months ago
  Hamid

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