List of DGS-Approved Maritime Training Institutes

List of DGS-Approved Maritime Training Institutes

Introducing the comprehensive list of DGS Approved Maritime Training Institutes, designed to provide aspiring seafarers with the necessary skills and knowledge to excel in the maritime industry. This list features a wide range of institutes that have been approved by the Directorate General of Shipping (DGS), ensuring that they meet the highest standards of quality and excellence.

Each institute on this list offers a variety of courses and programs that cover a diverse range of topics, including navigation, safety, engineering, and more. These courses are taught by experienced instructors who are experts in their respective fields, and who are committed to providing students with the best possible learning experience.

Whether you are a beginner looking to start your career in the maritime industry, or an experienced seafarer looking to enhance your skills and knowledge, the DGS Approved Maritime Training Institutes list has something for everyone. With its comprehensive coverage and high standards of quality, this list is the perfect resource for anyone looking to pursue a career in the exciting and dynamic world of maritime transportation.

INDOS IdMTI No.Name of InstituteCity / State
 1625 C.V. Raman College of EngineeringBhubaneswar
 2623 College of Maritime Studies & Research Kolkata
 3615 Dr. B.R. Ambedkar Govt. PolytechniquePort Blair
 4703 Garden Reach Ship Builders & Engineers LtdKolkata
 5624 Haldia Institute of Maritime Studies & ResearchHaldia
 6617 Marine Education Charitable TrustKolkata
 7607 Maritime Academy of IndiaKolkata
 8614 Maritime Education Training & Research Institute 24-Pargans(S) (W.Bengal)
 9606 Mercantile Marine Academy Foundation Kolkata
 10620 The Neotia University / Neotia Institute of Technology, Management and Science24-Pargans(S) (W.Bengal)
  11 612 Orissa Maritime AcademyParadip
  12 605 S.E.I. Education Trust Kolkata
    SEI Education Trust (Campus)
 13604 Seacom Marine CollegeKolkata
 14608 Sensea Maritime AcademyKolkata
 15622 Trident College of Marine Technology (Two Campus)
24-Pargans(S)(W.Bengal) & Kolkata
 16626 Asha Marine College owned by the RMU Charitable TrustSikkim
 17627 FOSMA Maritime Institute and Research OrganizationKolkata
 18 628 Hoon Maritime InstituteKolkata
 1409 Amer Maritime Training AcademyKanpur
 2421105012Anglo Eastern Maritime Training CentreNew Delhi
 3402 Applied Research InternationalNew Delhi
 4413 Aquatech Institute of Maritime StudiesNew Delhi
 5418 Asha International Institute of Marine TechnologyVaranasi
    Asha International Institute of Marine Technology (Campus)
Navi Mumbai
 6404 101003Centre for Maritime Education and TrainingLucknow
    Centre for Maritime Education and Training (Campus)Dehradun
  7401 Fosma Maritime Institute and Research OrganizationNew Delhi
  8 619 Institute of Marine Education & Research Pvt LtdPatna
    Institute of Marine Education & Research Pvt Ltd (New Campus)Lucknow
 9403101004International Maritime Institute LtdNoida
 10411 J. Sons Merchant Navy InstituteMeerut
 11419 Natcom Education & Research FoundationGurgaon
 12422 National Inland Navigation InstitutePatna
 13416 Oceanic Maritime AcademyDehradun
 14423 Oceans XV Educational TrustNew Delhi
 15420 School of Higher Academic and Professional Education Panchkula (Harayana)
 16412 Sriram Institute of Marine StudiesNew Delhi
 17424 HSNA Maritime Education & ResearchLucknow
 18425 105016Zasha Institute of Maritime StudiesDehradun
 19 105023Centre for Maritime TrainingNoida
  1805401001AMET UniversityChennai
  2817 Balaji Seamen Training InstituteChennai
 3815 Chennai School of Ship Management.
 4812 Chidambaram Institute of Maritime TechnologyChennai
 5830 Coimbatore Maritime AcademyCoimbatore
    CMC Maritime Academy (Campus)Chennai
  6834401004Commander Ali’s Academy of Merchant Navy
Medak (Hyderabad)
 7820 Cosmopolitan Technology of MaritimeChennai
 8840 GKM College of Engineering & TechnologyChennai
    GKM Institute of Marine Sciences & Technology (Campus)
 9909 HIMT College Hindustan Institute Of Maritime Training Pre-Sea Training CentreKalpakkam (Chennai)
  846 HIMT College (Tidel Park)Chennai
 10808 Hindustan Institute of Maritime Training Post Sea Training CentreKilpauk, Chennai
 11803 Indian Maritime CollegeChennai
 12814 402011Indus Seafarers Training AcademyChennai
 13821 International Maritime AcademyChennai
 14824 Marine Officers Training Academy Pondicherry
 15819 Maritime FoundationChennai
  16826 MASSA Maritime AcademyChennai
  17829 Mohammed Sathak Engineering College Kilakarai (Tamilnadu)
  18843 Noorul Islam University Kanyakumari (Tamilnadu)
  19845 Park Maritime Academy Coimbatore
  20849 Perunthalaivar Kamarajar Institute of Maritime Science & Engineering Chidambaram
  21848 Pondicherry Maritime Academy
(Chennai campus – Permission Withdrawn & campus De-recognized w.e.f. 06.12.2017)
  22841 Praveenya Institute of Marine Engineering & Maritime Studies Visakhapatnam (AP)
  23837 PSN College of Engineering & Technology Tirunelveli (T.Nadu)
  24813 RL Institute of Nautical Science Madurai
  25850 Jeyanthinather Academy of Marine Studies (JAMS)Thoothukudi (Tamilnadu)
  26906 Mainstay Training InstituteChennai
  27851 Sai Ram Shipping Science Institute 
(Closed Down)
  28836 Sailors Maritime Academy
(Voluntary closed w.e.f.01.01.2017)
Vizianagaram (AP)
  29838 School of Maritime Studies (Vels University)Chennai
  30823406029School of Seamanship and Nautical TechnologyKancheepuram
(Tamil Nadu)
  31847 SeaSkills Maritime AcademyCoimbatore
  32818 Southern Academy of Maritime StudiesChennai
  33833 Sri Chakra Maritime CollegePuducherry
  34842 Sri Nandhanam College of Engineering and TechnologyVellore (Tamil Nadu)
   35806 Srivenkateshwara College of Engineering Sriperumbadur (Tamilnadu)
  36853 Subbalakshmi Lakshmipathy College of Science 
(Closed Down)
  37810 Tamilnadu Maritime Academy Thoothukudi
 38908 Behara Institute of Maritime TrainingAndhra Pradesh
  1905 Cochin Shipyard LimitedKochi
  2811 Euro Tech Maritime AcademyKochi
  3835 Institute of Marine Engineers (India)Kochi
  4844 Kunjali Marakkar School of Marine Engineering of Cochin University of Science and Technology.Kochi
  5907 Mangalore Marine College and TechnologyMangalore
    Mangalore Marine College and Technology [Campus]Mumbai
  6807 Univan Maritme Training Academy (The Institute has voluntarily closed down w.e.f. 31.01.2017
  1086 Anglo Eastern Maritime AcademyKarjat (Maharashtra)
  2022 Anglo Eastern Maritime Training CentreMumbai
  3070 Arya Marine AcademyMumbai
  4012201001BP Marine Academy (Two Campus)Navi Mumbai
(Belapur & Panvel)
  5065 Baba Marine InstituteThane (Maharashtra)
  6073 Bonzer Academy of Maritime StudiesMumbai
  7079 Columbus Maritime Training Institute Thane (Maharashtra)
  8019 Don Bosco Normar Maritime AcademyMumbai
  9080 Fleet Management Training InstituteNavi Mumbai
  10074 Francon’s Marine AcademyGoa
  11081 Great Eastern Institute of Maritime StudiesPune
  12083 Gurship Education Trust Maritime Training InstituteMumbai
  13077 Indian Register of ShippingMumbai
  14011203011Institute of Marine Engineers (India)Navi Mumbai
  15308 Institute of Maritime StudiesGoa
  16078 Institute of Petroleum Safety, Health & Environment ManagementGoa
  17046 International Marine AcademyMumbai
  18018 International Maritime Training CentreMumbai
  19061 Maharashtra Academy of Naval Education & TrainingPune
  20024 Marine Medical Clinic 
  21030 Marine Training AcademyMumbai
  22064 Marine Training AcademyUdvada, Gujrat
  23044 Mariner’s Academy Thane (Maharashtra)
  24008 Maritime Training Institute (SCI)Mumbai
    Maritime Training Institute [SCI] (Tuticorin Campus)Tuticorin
 25039 MASSA Maritime AcademyNavi Mumbai
 26072 MMTI’s Education & Research Trust Khopoli (Maharashtra)
 27034 Mumbai Maritime Training InstituteMumbai
    Mumbai Maritime Training Institute (Campus)Dehradun
 28033 Naval Maritime Academy WestMumbai
 29032 NUSI Maritime AcademyGoa
 30023 OERC AcademyMumbai
 31082 Pentagon Maritime Training & Research InstituteNavi Mumbai
 32084 Ramana Academy of Maritime StudiesNavi Mumbai
 33037 Sagar Gyan Academy (Permission withdrawan and De-Recognized w.e.f.18.01.2018)Navi Mumbai
 34075 Samundra Institute of Maritime StudiesMumbai
 35088 Samundra Institute of Maritime StudiesPune
 36021 School of Synergic StudiesMumbai
  37028 SCMS Maritime Training InstituteMumbai
 38042 Seafarers Marine InstituteMumbai
 39058 Sea Scan Maritime Foundation
 40089 Setrac College of Offshore TrainingNavi Mumbai
 41066 SNS Maritime Training InstituteNavi Mumbai
 42010 St. Xavier’s Technical InstituteMumbai
 43045 Suraksha MarineMumbai
 44009 T. S.  RahamanMumbai
 45090 Tolani Maritime InstituteMumbai
 46017 Tolani Maritime InstitutePune
 47091207046U. V. Patel College of EngineeringKharva (North Gujarat)
 48026 United Marine AcademyNavi Mumbai
 49085 Univan Maritime Training AcademyMumbai
 50087 Vishvakarma Maritime InstitutePune
    Vishvakarma Maritime Institute (Campus)
New Delhi
 51063 Yak Education TrustRaigad (Maharashtra)
  52043 Yak Management & Marine Education CentreNavi Mumbai
 53092204021R.M. Maritime AcademyNavi Mumbai
 54 093210055Sakshi Institute of Maritime FoundationVirar (West), Palghar
 55094 Coral Maritime Institute of Learning & DevelopmentNavi Mumbai
 56095 Loyalty Marine Education TrustNavi Mumbai
 57096203064Pragati Marine CollegeNavi Mumbai
 58 204066Trident Institute of Maritime Studies, MumbaiNavi Mumbai
 59 206065S.P. Marine AcademyGujarat
 60 203066HSNA Maritime Education & ResearchNavi Mumbai
 61 208073M/s. Girik Maritime AcademyNavi Mumbai
 01616 Indian Institute of Port Management IMU Campus
Kolkata, IMU
 02602 Marine Engineering & Research Institute  (MERI)Kolkata
 03802 Indian Maritime University (National Maritime Academy)Chennai
    Indian Maritime University (Campus]Kochi
 04005 LBS College of Advanced Maritime StudiesMumbai
    Indian Maritime University  (Kandla Campus)Kandla
 05007 Marine Engineering & Research InstituteMumbai
 06006 T.S. ChanakyaNavi Mumbai
 07827 National Ship Design & Research CentreVizianagaram (AP)
Source: DG Shipping – INDIA
Step-down Transformers used onboard ship

Step-down Transformers used onboard ship

Transformers, unlike a motor, have no mechanical output (expressed in kW), instead, they are characterized by the apparent nominal power kVA that they can supply continuously. However, they are also designed to supply significantly higher power. A three-phase transformer is a combination of three interconnected single-phase transformers with three primary and three secondary windings mounted on a core with three legs.

The primary and secondary windings of three single-phase transformers can be connected in the following ways:

  • Primary in delta – secondary in delta (D/D)
  • primary in delta – secondary in star (D/Y)
Three-phase delta-star 3 transformer
  • primary in star – secondary in star (Y/Y)
  • primary in star – secondary in delta (Y/D)

Low Voltage Power Network

Low Voltage (LV) power plants supply
3 x 380 V/50 Hz, 3 x 440 V/60 Hz, etc, to the power-distribution network. Smaller electrical motors require 3 x 220 V to function. Voltages are reduced from 3x 380V to 3x 220V. This distributes a reduced voltage to the consumer network.

As there is a lesser voltage in the load side
(3 x 220 V) then on the power supply side (3 x 380 V), the current on the load side is greater than the current provided from the source side.

A regular LV power plant has four step-down transformers, shown in Figure 14.3 asT1 toT4.

T1 and T2 are located near the main switchboard .T3 and T4 are located in the vicinity of the emergency switchboard. One transformer from each side of the busbar (MSB and ESB) is kept in continuous operation while another is available as a standby unit. It is normal that the primary winding of the transformer is permanently connected to the power supply. The switching of the load is only carried out in the secondary circuit. Therefore, the standby transformer can be kept separate from the power network until required.

Transformer Parallel Operation

All transformers are hardwired to the power network during the construction process. The power plant manufacturer will have followed the requirements for parallel operation, ie:

  • The supply and load voltages are equal for both transformers
  • short circuit voltages for both transformers are equal
  • the load carried by both transformers is equal
  • the type of connection to both primary and secondary windings is equal.

Figure 14.4 illustrates features of 3 x 380 V/3 x 220 V distribution, where T1 and T2 are step-down transformers, Q7 and Q8 are automatic circuit-breakers for primary windings (supply) and Q9 and Q10 are automatic circuit-breakers for secondary windings (load).

If T1 is in operation and T2 is intended to be paralleled with T1, and T1 is scheduled to be put on standby, the following sequence for Q7 – Q10 circuit-breakers should be followed:

For bringing -T2 in parallel:

  • Primary winding circuit-breaker Q8 must be closed first
  • secondary winding circuit-breaker Q10 must be closed last, connecting -T2 under the load.

For switching off-T1:

  • Secondary winding circuit-breaker Q9 must disconnect the load from T1 first
  • primary winding circuit-breaker Q7 must then disconnect T1 from the supply voltage.

A similar sequence should be exercised for emergency switchboard transformers.

Figure 14.4 – Step-down transformers’ network outline

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Types of Speed Monitoring Sensors & Troubleshooting

Types of Speed Monitoring Sensors & Troubleshooting

There are two types of speed sensors: magnetic pickups and proximity switches. Although they look similar there are significant differences between the operating principles and troubleshooting approach. This section is intended to explain the basic differences.

Overview at MAN B&W engine proximity switch probes

Electromagnetic Speed Sensors

Electromagnetic speed sensors are also known as Magnetic Pickups (MPUs). The operating principle is based on the fact that as the ferromagnetic pole wheel passes, the speed sensor head will alter the magnetic field in a magnetically biased coil (Figure 18.27). Based on the law of induction, an AC output voltage is generated, with a frequency and amplitude proportional to the speed of the pole wheel.

The output voltage of the magnetic pickup can be affected by the following factors:

  • Voltage increases as the surface speed of the monitored magnetic material increases
  • voltage decreases as the air gap between the magnetic head and the surface of the gear tooth is increased
  • voltage waveform is determined by the size and shape of the gear tooth in relation to the size and shape of the pole piece.
Figure 18.27 – Magnetic Pickup

Large engines usually have a larger air gap between the speed pickup probe and the monitored gear.

Ferromagnetic Speed Sensors with Line Amplifier

Proximity speed switches operate well on large engines as they can operate with a large air gap and low surface speeds.

The principle of operation is based on the fact that
a ferromagnetic pole wheel passing the sensor
head influences the voltage in an integrated HAL element magnetic sensor (Figure 18.28). The
voltage is amplified to a square wave signal with
the frequency dependent on the pole wheel speed. When a flywheel tooth is within the sensing range of a proximity switch probe, the output of the switch is nearly equal to the supply voltage. On passing the tooth, the sensor output switches to zero volts until another tooth comes into proximity of the sensor head. The amplitude approximates to the supply voltage and is independent of speed.

Figure 18.28 – Proximity Switch

Proximity switches require a constant external DC voltage power supply. Depending on the proximity switch probe manufacturer, it can be within a range between 10-30 V and is always applied even when an engine is stationary. This may be from the same supply source as the power for the engine control and safety system. The maximum current rating for proximity switches is 80 mA, but the actual current is much less and depends on the external load.

Speed Pickups’ Diagram Definition and Troubleshooting

There are various symbols to define speed pickups in diagrams (Figure 18.29), they are often represented as RPM-to-Frequency (n/f) converters (Figure 18.30).

Figure 18.29 – Speed pickup symbols
Figure 18.30 – Speed pickup wiring forWartsila L38 engine

The difference between the two types of speed sensors, magnetic pickup, and proximity, are as follows:

Magnetic Pickup (MPU)

  • Small gears and high surface speeds
  • high frequencies 1kHz and more
  • no power supply needed
  • sensor output signal +/-1.5 V AC (RMS).

Proximity sensor (PU)

  • Large gears and slow surface speeds
  • max switching frequency is 500 Hz
  • needs a power supply 10-30 V DC.

As both types of speed sensors are called pickups, it is important to determine which type it is.
If it cannot be determined for example by the manufacturer’s manual, catalogs, etc, the easiest way is to count the number of conductors connected to the sensor on the diagram (Figure 18.30):

  • 3-wires – Proximity speed sensor (173.SE1)
  • 2-wires – Magnetic pickup (167.SE1).

As an MPU has a permanent magnetic field, it can be also checked by bringing magnetic material in proximity to the magnetic head.

When determining the type of speed probe for installations, the manufacturer’s data tables are helpful. An example of a table is given in Table 18.9 for Wartsila L38 engines.

On observing a deficiency in speed monitoring
and to establish if an employed proximity speed sensor is failed and has to be replaced, the power supply across 23.1 (+) and 23.2(-), and the frequency across 23.3 (S) and 23.2 (-), should be measured (Figure 18.30).

If no voltage is detected or the voltage level
has dropped below the limits defined by the manufacturer, eg an open conductor or a power supply earth failure, the frequency would be nil or the signal would become erratic.

The procedure for checking the proximity speed switch is illustrated in Figures 18.31 and 18.32.

Figure 18.31 – Measuring voltage for proximity speed switch
Table 18.9 – Speed probes’ data sheet (extraction from Wartsila L38 LCS PLC data sheet)
Figure 18.32 – Measuring frequency output from proximity speed switch

To confirm that an MPU is in order, Figure 18.BO, both the output voltage and frequency should be measured from the same terminals 24.1 and 24.2.

For both types of speed probes, if the frequency-carrying conductor becomes short-circuited to ground, some PLC-based applications have been known to interpret this condition as being related to over speed and can shut the engine down. Restarting became impossible until the fault was rectified.

Speed Monitoring Relays

The purpose of a speed monitoring relay is to measure the frequency taken from the speed pickup, compare it with the adjusted set point (0-100% of the relay’s frequency range) then produce an output by using the relay’s internal contacts in the event of reaching a set point.

The example given in Figure 18.33 illustrates the speed control for a Piller auxiliary engine. The frequency from one of its speed proximity sensors is shared in parallel by two-speed monitoring relays (K1 and K14). One relay acts as the ignition speed relay to cut off the starting air supply as soon as the cranking speed is reached. The safety system is engaged after the engine has reached a predetermined RPM. The second relay is used for an overspeed-related safety function. As a consequence, the relay set points are different.

Frequency to Current (F/l) Converters

The example in Figure 18.34 represents an extract from a MAN B&W engine speed monitoring diagram. U1 and U2 are frequency-to-current converters (Figure 18.35) that convert the frequency signals received from proximity speed switches into a 4-20 mA signal (required as an analog input for ABB PLC).

Figure 18.33
Figure 18.34 – MAN B&W speed monitoring section
Figure 18.35 – MAN B&W engine control system speed converters
What is Miniature Relay & its features?

What is Miniature Relay & its features?

What is Miniature Relay & its features?

The Miniature relay is an electro-mechanical switch, consisting of a coil, an armature, and contacts. 

A current passes through the coil creating a magnetic field that attracts the armature, causing the contacts to move, either making or breaking a connection. The following contacts are known by how they can be thrown:

Normally open (NO)

When the relay is activated, NO contacts connect the circuit and will disconnect the circuit when it is inactive.

Normally closed (NC)

NC contacts disconnect the circuit when the relay is activated and connect when inactive.

Change over (CO)

The contacts have a common terminal and control two circuits. One is a NO contact and the other is an NC contact. It is also known as a ‘double-throw’ (DT).

The following contact designations are also commonly encountered 

Miniature relay contacts designations

Single Pole Single-Throw (SPST)

These have two terminals that can be connected or disconnected (11-12 or 13-14) and two terminals for the coil. The terminology’SPNO’and ‘SPNC’ is sometimes used to indicate the contacts’ de-energized state (Figure 3.4a and b).

Double Pole Single-Throw (DPST)

The relay has four terminals that can be connected or disconnected. This is equivalent to two SPST switches actuated by a single coil and has two terminals for the coil (Figure 3.4c).

Single Pole Double-Throw (SPDT)

With a total of five terminals, two for the coil, a further terminal connects to two others as a CO contact (Figure 3.4d).

Double Pole Double-Throw (DPDT)

This has eight terminals with two rows of CO contacts. It is equivalent to two SPDT relays actuated by a single coil (Figure 3.4e).

Miniature relays are also subdivided by their operation:

Non-Latching (stable type)

A relay is activated when the coil is energized and turns off when de-energized. Non-latching relays are used in control applications when the switch must return to a neutral state if power is lost.

Latching type

Latching relays are used when power consumption and dissipation are limited. For example, after the initial actuation of the relay, no further power is needed to maintain the state.

  1. One Coil Latching Type
    This relay uses a pulse input to a single coil and a latching mechanism to maintain the contact as either on or off. By applying signals of opposite polarities the relay is set and reset.
  2. Two Coil Latching Type
    This relay uses a latching construction and two coils, one to set and another to reset. Setting and resetting is achieved by applying pulse signals of the same polarity.

Miniature relays are designed so that the casing does not become detached under normal use, as performance could be reduced. Consequently, the DIN rail mounting system allows simple replacement of malfunctioned relays. A PCB (Printed Circuit Board) miniature relay is illustrated in Figure 3.5a, socket mounted ‘ice cube miniature relays and their terminal designation are illustrated in Figures 3.5b and c.

figure 3.5a

Miniature relays are assembled into control cabinets with their sockets, which can in general be subdivided into two basic types:

  • Screw terminals sockets
  • screwless terminals sockets (for fast wiring). All sockets are either panel- or 35 mm rail-mounted (EN 60715). Socket’s terminals, as well as relays’ contact pins, are assigned with reference numbers, which should be used when troubleshooting to verify the contact’s condition in an energized and de-energized state.

What is Process Calibrators & their functions?

What is Process Calibrators & their functions?

Process calibrators are considered a handy tool for the calibration and troubleshooting of process control equipment.

As explained mA, mV, and frequency signals are used in a variety of electronic appliances including PLCs. Input signals are often required for calibrating and simulating processes during troubleshooting, so a Multifunction Process Calibrator is a useful instrument. A Multifunction Process Calibrator with a dual-function display (calibrator and/or multimeter) is capable of the following functions:

  • Constant voltage output: 0-1.5 V DC with a resolution of 0.1 mV, 0-15 V DC with a resolution of 1mV
  • constant current output: 0-25 mA with a resolution of 1 mA
  • square wave output: 0.5 Hz-5kHz with an amplitude of 5 V, +/-5 V, 12 V, and +/-12 V. The resolution is the ability of the instrument to differentiate between two signals of close frequency. It is determined by the gate time.
  • The following processes can be managed using a Multifunction Process Calibrator
  • Two-wire transducer simulation on a current loop
  • two-wire transmitter operational checks
  • R/l and U/l converters – transmitter simulation and operational checks
  • thermocouple output simulation and operational checks
  • frequency transmitter simulation and operational checks
  • F/l converters – operational checks and simulation
  • proximity transducers – operational checks and simulation.

At the end of this chapter, Below Table gives a brief overview of the different process calibrators available from various manufacturers.

Various brands process calibrators
What is Automatic Voltage Regulator (AVR) & How it Works?

What is Automatic Voltage Regulator (AVR) & How it Works?

When a load surge is experienced, eg when a ship’s cargo lifting equipment picks up heavy cargo, the generator voltage dips as a result. Similarly, load shedding will result in a generator overvoltage. In other words, on board, there is no such thing as a constant load. Therefore, a continuously fluctuating generator voltage must be regulated. The Automatic Voltage Regulator (AVR) regulates the generator’s output voltage by regulating the voltage of the main field (rotor’s winding).

This particular device ensures that the voltage is maintained within the required range and rapidly corrects any voltage deviations caused by load dips and shedding. In addition to regulating the generator voltage, the AVR circuitry includes protective features to ensure safe and reliable control of the generator.

Modern AVRs consist of high-quality electronic components. The components are usually cast with epoxies, which protect against high temperatures, moisture, and vibration.

A replacement AVR, if required, must be installed in accordance with the manufacturer’s installation requirements.

Troubleshooting Tips

If the generator produces either no voltage or fluctuating voltages, try to locate the problem. Check all connectors and cables in the terminal box and the exciter components for secure connections.

While tracing a problem with an AVR and/or excitation system, the following checks can be carried out.

Fault descriptionAction suggested
No voltage build-up when starting setFollow separate excitation or residual voltage tests
Loss of voltage when set runningFirst stop and re-start set
If there is no voltage or the voltage collapses after a short time, follow the separate excitation test procedure
Generator voltage high followed by collapseCheck sensing leads to AVR. Check isolating transformer secondary output – refer to the separate excitation test procedure
Voltage unstable, either on no-load or with loadCheck speed. If correct, check the voltage stability setting. Refer to the load testing procedure from the manufacturer
Voltage low on loadCheck speed. If correct, check the voltage stability setting. Refer to the load testing procedure from the manufacturer
Phase voltages unbalancedCheck stator winding and cables to the main circuit-breaker
Excessive voltage/speed dip on load switchingCheck governor response and P-droop adjustment for the governor
Sluggish recovery on load switchingCheck governor response and P-droop adjustment for the governor
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