Fault Analysis and related Technical problems in Power System

Reading Time: 16 minutes

Can you imagine a day without electricity?  In this modernized world, we are heavily dependent on machines which directly or indirectly rely on electric power either your mobile, laptop, cooling, lighting equipment, automobiles(electric), trains, metros, medical equipment etc. The system involving the process from the generation of electric power to transmission to distribution is termed as power system. The power system is the largest and most complex man-made physical system.

The power system is a system that deals with the generation, transmission, distribution and the consumption of electricity. Power generating stations are not always close to the load centres especially in case of hydro, nuclear, and tidal generating stations. Here comes the role of electric power transmission. The electric power is transmitted over HVDC/HVAC lines which is then received by substations of various load centres where distribution sector comes into play.

Also, all power plants can’t work throughout the year with same capacity due to many factors (like weather factors, fault, maintenance etc.), so they need power back up during that time from other generating stations. Due to all these factors, for an uninterrupted power supply, the power grids of different parts need to be interconnected.

Fault Analysis and related Technical problems in Power System

The fault occurred at any of these units may result in severe damage to the system. The most common faults are short circuit and rare one is the open circuit fault. The fault may occur due to a number of factors that may be natural, physical, mechanical or chemical etc. The main factors for the fault are natural including winds, lightning strike, floods and many others which are not in our control so under such condition it becomes very important to have fast, effective and efficient protective devices.

The effects of faults can be very drastic, under severe condition it may result into blackouts, failure of the power grid. One can understand it by the effect of power cut off in hospitals, transportation, mining sites, industries, and other institutions solely dependent on electric power. If you are a regular reader of CEV blogs then probably you would have striken with one of the amazing blogs over the blackouts in India and Ukraine by Rahul Kumar.

The faults are mostly short circuit faults in both DC or AC transmission lines, 60-80% of which occurs due to natural factors like strong winds, cyclones, lightening etc. In India, most of the electric transmission occurs on high voltage 3 phase AC lines though we are moving towards HVDC lines for long distance transmission due to several advantages over ac transmission

  • low power loss (Rdc < Rac due to skin effect),
  • asynchronous mode of transmission (enables us to connect the power grids operating at different frequencies due to no frequency restriction unlike AC),
  • smaller towers and less copper requirements (2 wires are required while HVAC requires 3 wires),
  • easy power flow control (no capacitive or reactive drop) etc.,

The conclusion is that HVDC transmission is more economical as compared to HVAC but for small and medium distance transmission HVAC transmission systems are more economical because HVDC involves convertor at sending end and invertor at receiving end which increases the setup cost to manifolds. HVDC transmission is also possible just because of the invention of AC.

HVDC is a complement of AC, not a competitor.

Now, let us come back to the discussion over fault. It is clear that the protection from fault is of immense importance. As soon as the fault occurs it becomes very important to detect, locate and isolate the faulty system to protect the rest of the system. The very first step for the protection against fault is to locate and detect the type of fault. Previously we were having electrically and mechanically controlled devices which are slow and less efficient. Now we are having power electronic devices to sense the faults very fast (senses faults in milliseconds). Here comes the role of relays. A relay in simple language is a device which senses a disturbance in the power system based on the measurement of current, voltage phasors or various other criteria and sends signal to take suitable action. There are number of relays available but most widely used is distance relay whose functioning can be explained as follows-

Distance Relay- Distance relay observes the power system based on the calculation of apparent impedance using the synchronised voltage and current phasors measurements at the bus where relay is provided. They are fast, accurate, directional, can provide backup protection. Primarily they were used only for transmission line protection but now they are also used for generator backup, transformer protection etc.

There is a total of 10 short circuit faults which can be categorised as follows-

  • Symmetrical fault- It includes the 3 phase to ground fault and are called symmetrical because I and v remain balanced even after fault. They account for 8-10% of the total faults in power system
  • Asymmetrical faults- It includes – line to ground fault (A-G, B-G, C-G : 75-80%), line to line(A-B, B-C, C-A : 5-7%), line to line to ground (A-B-G, B-C-G, C-A-G: 10-12%) and are called asymmetrical as I and v are no longer balanced after fault.

Symmetrical Components To analyse the faults, sequence components are used as the faulted system may or may not be balanced, so it is better to convert the 3-phase system into the 3 sets of 3 balanced phasors –

  1. zero sequence components (all phasors have equal magnitude and are in phase) :

          Va0 =  Vb0 = Vc0

  1. positive sequence components (all phasors have equal magnitude and are 120° displaced from each other in same sequence as the original phasor). If a = 1∠120° then,

         Vb1 = a2 Va1 ;           Vc1 = a Va1 ;

  1. negative sequence components (all phasors have equal magnitude and are 120° displaced from each other in the opposite sequence of the original phasor)

          Vb2 = aVa1 ;           Vc2 = a2 Va1 ;

Such that:

Fault Analysis and related Technical problems in Power System

Now the sequence component can be calculated as:-

Fault Analysis and related Technical problems in Power System  

Similar conversion can be done for the current phasors also.

Fault Analysis by impedance calculations-


  1. Fault impedance is zero, i.e., solid grounding of the fault.
  2. Pre-fault currents are assumed to be zero as they are negligible in comparison to the high short circuit currents.
  3. System is in balanced state before the occurrence of fault.

Consider a balanced 3 phase transmission line

Fault Analysis and related Technical problems in Power System

  1. 3 phase fault (Phase fault protection)–


Fault Analysis and related Technical problems in Power System

If the fault has occurred at x percent of total distance from the start as shown in figure –

Fault Analysis and related Technical problems in Power System

Vabc = x Zabc Iabc [As Vn =0]

V012 = x diag(Z0, Z1, Z2) I012

Using I012 = T-1 Iabc and Ia+Ib+Ic=0,

I0=0, I1= Ia and I2 = 0

Or V0 = V2 =0 and V1 = xZ1I1 = xZ1Ia = Va


Fault Analysis and related Technical problems in Power System

Fault Analysis and related Technical problems in Power System

Now, x can be determined as the ratio of apprent impedance seen by the relay to the positive sequence impedance of the line and thus, the fault can be loacated using the line current and voltage measurement.


  1. Line to Line fault (Phase fault protection)

Consider a transmission line with B-C fault at x percent of the total length as shown below-

Ic + Ib = 0,  Ia =0 [Pre-fault current are zero]

Fault Analysis and related Technical problems in Power System

Fault Analysis and related Technical problems in Power System

ΔVa =Va = 0,

ΔVb =Vb = x(Zs-Zm)Ib =xZ1Ib ,

ΔVc =Vc = -x(Zs-Zm)Ib = -xZ1Ib = -Vb,

Fault Analysis and related Technical problems in Power System

Fault Analysis and related Technical problems in Power System ,

which is same as the above case, so these two faults can be located with the same set of equations.


  1. Line to Ground fault (Ground fault protection)-

Consider a transmission line with A-G fault at x percent of the total length as shown below-

Fault Analysis and related Technical problems in Power System

Using Ic =Ib =0 and I012 = T-1 Iabc

I0= Ia /3, I­1=a *Ia /3 and I2 = a2*Ia/3

Fault Analysis and related Technical problems in Power System

ΔVb = ΔVc = xZmIa

ΔVa =Va = xZsIa

Va = x(Zs – Zm + Zm)Ia

Va = x(Z1+ Zm)Ia

Fault Analysis and related Technical problems in Power System

Fault Analysis and related Technical problems in Power System

The above equation is used for locating the ground faults.

  1. Line to Line to Ground fault (Ground fault protection)-

Consider a transmission line with B-C-G fault at x percent of the total length as shown below-

Fault Analysis and related Technical problems in Power System


Ia=0, ΔVb =Vb, ΔVc =Vc

Using Ia =0 and I012 = T-1 Iabc

I0= (Ib + Ic)/3

Fault Analysis and related Technical problems in Power System

Fault Analysis and related Technical problems in Power System

So, the ground faults can be detected by the above equations.


Zone Setting –

This is how the distance realays work. But the assumption described above are not found in pracitcal scenerios and hence creates inacuracy in the meaurements. To avoid that, models needs to be modified accordingly.

Distance relays are used to provide both primary as well as the backup protection. Primary protection should be fast and accurate while the backup protection should work only if the primary protection fails. This is done by setting up the impedance zones for the relays. Generally, 3 zones are set-up, first being for the primary protection while the other two for the backup protection.

Zone 1 is set upto 80% of the primary line impedance. The complete primary line is not considered in the zone 1 because measurement instruments (CT,PT) are present near the buses which are prone to give errors in measurement of apparent impedance, thus making it difficult to locate the fault. In addition, the assumptions used in the equations for the relays are not valid in the practical cases.

Zone 2 covers the complete primary line impedance and 50% of shortest adjacent line impedance. This is done so as to overlapping of zone 2 of 2 different relays. For example, in example below if zone 2 of R1 covers more than 80% of the BE then it will overlap with the zone 2 of DE which may create undesirable competetion between them to send the trip signal.

Zone 3 covers the complete primary line impedance and 120% of longest adjacent line impedance.

For example- Consider a 5bus system as shown below-

Fault Analysis and related Technical problems in Power System

Zone1= 80% of ZAB

Zone2= ZAB +  50% of ZBE

Zone3= ZAB +  120% of ZBD

Co-ordination time interval (CTI)

When fault F3 occurs the primary relay R3 should get the first chance to trip the signal and if it fails then zone 2 of R1 and finally the zone 3 of some relay should come into play. This is a crucial consideration as the objective of the power system is to supply the maximum possible power to the consumers. To ensure this, zone setting is done along with providing a time delay called CTI. Zone 2 is provided with 1CTI while the zone 3 is provided with 2 CTI as explained in the following timing diagram-

Fault Analysis and related Technical problems in Power System

This is all about how distance relays works and how the fault can be detected but the principle of working also involve a number of situations that may lead to mal-tripping of line. Maltripping occurs when the apparent impedance seen by relay enter into the sensitive zone of the relay in a non-fault condition and the relay interpret it as fault issuing trip signal. The mal-tripping events are mainly associated with the zone-3 as it is extended over very wide area to provide backup protection. This situation may cause drastic impact on power system especially under overloading codition. Under stressed conditions, when any such maltrip occurs this resluts in increase in load over the other lines  as system will tend to draw power from the other path causing cascaded outage and blackout. The blackout occurred in 31 July, 2012 in India is initiated by distance relay zone-3 maltripping of Bina-Gwalior line.

Events causing maltripping are  briefed as follows:

  1. Infeed and outfeed effect-

This effect is now almost nullified by the advancement in technology and modification in the operation of distance relay. Consider a 4bus 3 source system as shown below-

Fault Analysis and related Technical problems in Power System

If the fault occurs ‘F’, apparent impedance seen by relay R1

Va = IabZ1 + Ibc *xZ2

Va = IabZ1 +(Iab + Ied) *xZ2

Fault Analysis and related Technical problems in Power System

The above equation clearly indicates that Z­­r is increased by-

Fault Analysis and related Technical problems in Power System

due to infeed from generator 2. This may push the Z­­r to move outside the sensitive zone of the relay and hence decrease the dependability of the relay.

If the Generator G2 is replaced by a load then the direction of Ied will be reversed and thus Z­r will decrease by-

Fault Analysis and related Technical problems in Power System

Zr =  Z1 + xZ2 –   *xZ2

This pushes the impedance into the sensitive zone of the relay, and may detect fault even for the healthy system and hence decreases the security. This is highly undesirable as it may lead to casacaded outage and blackouts.

  1. Load Encroachment

Load encrochment or overloading is the major reason causing zone-3 maltripping. In the power system, energy is not stored so, the equivalence between the generation and consumption of power is must. The power consumption is not uniform throughout the day and it also varies depending on the weather conditions. In India, demand is at peak during day hours of summer due to heavy operation of coolers, ACs, fans and pumps for irrigation in the farms. In addition, many hydro power plants fails to supply power in summer due to deficiency of water. Under such cases, power system operate close to its stability limit and any contingency under such situation may result in maltripping, cascaded outage and the blackouts. One such example in front of us is the blackout of July, 2012 in India. India is energy efficient country but still the above mentioned condition may cause overloading and turn the system stressed. The depecndancy on electric power is increasing day by day over the world. Though the generation of power is increased at very appreciable rate yet the consumption rate is not perfectly matched. Consequently, in the near future, the probability of power system to work at its stability limit will increase and for ensuring the reliability and security of power system, preventing measures to avoid such cascaded outages must be introduced, some of which are discussed briefly later in this section:

Fault Analysis and related Technical problems in Power System
Power flow on transmission line

Apparent impedance seen by the relay R is given by-

Fault Analysis and related Technical problems in Power System

which means apparent impedance is directly proportional to the square of voltage magnitude and inversely proportional to the apparent power flow.

Under peak load conditions, power flow from the bus i towards bus j (P-jQ) will be very high and the increase in reactive power flow also decrease the voltage. The combined effect of these may cause the Zto enter into sensitive zones of the relay causing maltriping which decreases the security of power system and may lead to voltage collapse, cascaded outage and blackouts.

To avoid the malfunctioning of the relays due to load encroachment, a number of methods are being described. Some of the methods proposed are:

  1. For the loads power factor is high (R/X) while for the faults power factor is generally low due to high reactance of the line in comparision to the negligible resistance. Thus by blocking the high power factor region (shedded in the figure) of the zones we can prevent the malfunctioning of the relay due to load encroachment.
  2. Relay Boundary Setting Adjustment- Malfunctioning of the relay can also be avoided by modifying the zones of relays based on the loading conditon and power system structure.
  3. Voltage stability criteria can be chosen for identifying the fault and allowing the relay to function only under that condition else not.
  4. System state indicator (SSI) can be used as a measure of power system condition and taking suitable action based on that.

Fault Analysis and related Technical problems in Power System

And many other such techniques. But still we don’t have economical and completely effective method without any drawback.

The most practical and widely adopted methods are ‘c’ and ‘d’ which are based on the connection between voltage stability and load fluctuations.

Firstly, letus discuss about Volatage stability. It is ability of the power system to maintain steady voltage at all the buses, when subjected to a disturbance. Voltage instability may arise due to loss of load, tripping of transmission line, cascaded outages, loss of synchronism of the generator, mismatch between reactive power demand and supply, high inductive reactance of transmission line causing high voltage drop etc.

Based on the duration of distubance causing, instability it is classified into following categories-

Short- term or transient voltage instbility(1-10 sec)Long- term voltage instability(1-60 minute)
i. Automatic corrective actions are taken as operator actions are difficult due to time constraintsOperator interventions are possible for larger time scale
ii. Mainly caused by rotor anle imbalance and loss of sysnchronism. It includes automatic voltage regulators, excitation systems, turbine and governor dynamics, induction motors, electronically operated loads and HVDC interconnections also fall in this categoryMainly caused due to large electrical distance between generator and load. The instability is caused due to high import of power from remote generating station to load, a sudden load build up, large distubance etc. Components operating in the long-term time frame are transformer tap changers, limiters, boilers etc.
iii. Steady state analysis (how stressed the system is, how close the system to point of instability) are usefulSuitable model of system needs to assumed and analysis needs to be done for the whole time frame of disturbance.


Now, for finding the relationship between the voltage stability and load encroachment, a 2-bus system analysed to see the effect of load (P-jQ) on the voltage stability.

Fault Analysis and related Technical problems in Power System

The power transfers from bus 1 to 2 are given by-

Fault Analysis and related Technical problems in Power System

Where E= E∠δ is the voltage at bus 1, V= V∠0 is the voltage at bus 2 and X is the reactance of the transmission line between the 2 buses.

The above equations are derived from power flow analysis.

Normalising the terms as v=V/E, p= PX/E2 and q= QX/E2,

p = vsinδ  and q = vcosδ – v2

Eliminating δ from these two equations,

v4 +(2q-1) v2 + (p2 + q2) = 0

Fault Analysis and related Technical problems in Power System

Fault Analysis and related Technical problems in Power System

Now, based on the above equations power and voltage relationship can be discussed in the following way-

  1. P-Q-V 3D curve:- For each (p, q) point, we are having 2 values of ‘v’, larger (stable) and smaller (unstable). The nose point where these two values are equal gives maximum power point and increase in power beyond this limit will result in voltage instability.

Fault Analysis and related Technical problems in Power System

2. V-P Curve- The figure below depicts that maximum active power transfer limit increase and the rate of decay of voltage with ‘P’ decrease with increase in the power factor as shown below-

Fault Analysis and related Technical problems in Power System

v1 ,v2 will exist only if v2 is real i.e.,

Fault Analysis and related Technical problems in Power System

Fault Analysis and related Technical problems in Power System

If k is the power factor then, k = q / p;

Fault Analysis and related Technical problems in Power System

and thus the nose point power or

Fault Analysis and related Technical problems in Power System

So, the maximum limit of the active power at specific power factor exists above which the system may fail to maintain the voltage stability.

3. Q-Vcurve:- Voltage stability is closely related with available reactive power reserve (Reactive power margin). The points where dq / dv = 0 are termed as critical points or the nose points and they represent minimum reactive power compensation for a particular value of active power. On the left of nose points dq / dv < 0 i.e., VQ sensitivity is negative in this region showing the unstable region of operation for a particular value of active power. Whereas on the right of nose points dq / dv > 0 i.e., VQ sensitivity is positive in this region showing the stable region of operation for a particular value of active power

p = vsinδ  and q = vcosδ – v2 , thus,

Fault Analysis and related Technical problems in Power System 

Fault Analysis and related Technical problems in Power System

The distance between operating point and nose point is known as reactive power margin and it determines reactive power compensation required for avoiding the voltage collapse. It is clear from the figure below that reactive power compensation increases with an increase in normalised active power which increases the sensitivity of voltage with reactive power. Greater the load, greater will be the slope of q-v curve in the right side, and weaker will be the bus.

From this discussion, it is clear that voltage stability decreases with the load encroachment. Thus it is justified that both the distance relay maloperation and voltage stability are related to load encroachment in a similar way. Utilising this relationship, VQ sensitivity can be used as criteria to define the weakness of the bus and thus for the load shedding. This property can be used for providing an adaptive load shedding scheme to avoid the distance relay maloperation.


SSB INTERVIEW : An overview

Reading Time: 8 minutes

By- Anshuman S. Jhala

Many of us are having the desire of joining defense forces as an officer. After passing any defense exam that provides officer rank selection, then the next stage is the SSB interview. SSB stands for service selection board. I have come up with a short summary of the tests that are held at the selection board. SSB is one of toughest interviews of India. You will wonder to know that even many famous personalities namely, Shahrukh Khan, Amitabh Bachchan, Dr. APJ Abdul Kalam, Rahul Dravid, failed to crack the SSB interview but later achieved success in some different fields.

SSB INTERVIEW : An overview

The key to success in SSB is honesty. The SSB works on some principle of Mansa, Vachan, and Karma that means what you think, what you speak and what you do must match. If you do your work with honesty, confidence, conviction and enjoy then no one can stop you. The candidate must keep in mind that selectors are looking for ‘right’ fit, not ‘best’ fit.

Indian defense is consisting of 4 services, Indian army, Indian Navy, Indian Air Force (IAF), and the Indian Coast Guard. There are, 3 selection centres for army – Bhopal (MP), Bangalore (Karnataka) and Allahabad (UP), 4 for Navy – Coimbatore (Tamil Nadu), Vishakhapatnam (AP), Dehradun (Uttarakhand) and Bangalore (Karnataka), 5 for air force- Dehradun (Uttarakhand), Mysore (Karnataka), Gandhinagar (Gujrat), Varanasi (UP) and Kanchrapara (West Bengal).

SSB INTERVIEW : An overview


SSB is 5 to 6 days interview in which the OLQs (Officer Like Qualities) of a candidate are judged. The board provides facilities of residence, food to its candidates during the interview.

The test is done in two stages.

Stage 1 is conducted during the first day which is basically a screening test. It comprises of OIR (Officer Intelligence and Rating) test and PPDT (Picture perception and description test).

  1. OIR is a basic aptitude test which is quite easy, but the time is kept shorter to judge the smartness of a candidate.
  2. PPDT – This is the major part of the screening process. In this test, a blurred picture is shown to the candidates for 30 seconds. Then one minute is given to describe all the characters of the picture (Age, Sex and Mood) and action in the picture. After that 4 minutes are given to write a story based on the picture being shown. Then the candidates are divided into a group of 10 to 15 are made to sit in a semicircle in front of 3 assessors (GTO, Psychologist and Interviewing Officer) and asked first to narrate their stories, discuss the stories they have written and based on the discussion make a conclusive story which is to narrated by one of the group members.

On the basis of the performance in stage 1 candidates are selected for stage 2. The selection ratio is generally 1: 10 (may be somewhat more or less). The results of stage 1 are announced in the noon. The selected candidates stay at the center for stage 2 and the disqualified candidates are asked to leave.

Stage 2- Stage 2 starts from day 2. Firstly, a PIR (Personal Information Questionnaire) form is given in which all information related to education, family, lifestyle (hobbies, friends etc.)  from childhood to till date are asked. This form is to be filled with honesty and without any exaggeration as this may be kept with Interviewer during your PI and conference on last day

The tests conducted during stage 2 are –Psychological tests (TAT, WAT, SRT, SDT), PI, Group tests (GD, MPE/GPE, PGT, GOR, HGT), Lecturrette, Individual Obstacle, Command Task, Final Group Task and then finally conference is being held.

Psychological tests- They are under the supervision of a psychologist.

  1. TAT (Thematic Apperception test)- This is quite similar to PPDT test, differs in the process. In this test 10-12 slides (including 1 blank slide) are shown one by one and candidates have to write a story based on them in a span of 3-4 minutes for each story. This test judges your attitude, positivity and your practical knowledge.
  2. WAT (Word Association Test)- In this test, words are spoken by assessor speedily and candidate have to write the sentences on those words in that meantime (5-7 seconds). The pace is kept high so that the candidate writes the first sentence that struck to his mind after seeing that word. This, in turn, judge the thinking ability and maturity of the candidate.
  3. SRT (Situation Reaction Teat)- In this test, each candidate is given a booklet containing 60 situations and the candidates have to write their actions for each situation in 30 minutes. This test judges the social behavior practical ability and range of thinking of the candidate.
  4. SDT (Situation Description Test)- In this test candidates are asked to describe themselves in their own word. Questions are like- what do think about your friends? , what your friends/relatives/parents/teachers think about you? etc. This test judges your personality, nature, and maturity.

PI (Personal Interview)- It is of great importance in the selection of a candidate. PI is held between a high ranked officer of arms and the candidate. The length of PI may vary from 30 minutes to 90 minutes. The interviewer assesses you completely, the way you walk in, the way you speak, your confidence and conviction. The question asked by assessor may be anything either general awareness or personal life or situation test or knowledge about arms, etc.


Group tests- These are held under the supervision of GTO (Group Tasking Officer).

  1. Group Discussion (GD)- Firstly the candidates are divided into a group of 10-15 and are made to sit in a semi-circle. GD is conducted in 2 parts- In the first part the GTO gives 2 topics both of day to day happenings but of different difficulty level, of which one is to be selected by the group and discuss on it for 15-20 minutes. In the second part, GTO gives another one topic on which discussion of the same duration is to be done. GD tests the listening skills, speaking skills, group adaptability and leadership skills of a candidate are judged.
  2. MPE/GPE (Military or Group Planning Exercise)- A armed officer has to face many unforeseen problems, so one must be capable of dealing with such situations. In this test, many situations are narrated by GTO to the candidates and then the narrative is given to the candidates for 10 minutes to read the problems. After that, the solution of the problems is to be written by the candidate in further 10 minutes. GTO collects the sheets from candidates and are then asked to discuss the solution and provide a common solution to GTO. By this test the assessor judge that how the candidate is able to use his team and resources to find the most efficient solution.
  3. Progressive Group Task (PGT)- This is first field exercise of SSB and is a group task as the name suggests. In this test some helping materials like rope, wooden log, plank etc. are provided to the candidates and the various rules like the color rule, jump rule, infinity rule etc. are explained by the instructor. The candidates have to perform the task in the given time interval and based on their performance, they are evaluated. This test judge the leadership skills, group adaptability, ability to take risks and positivity of the candidates.
  4. GOR(Group Obstacle Race)- This is also a group on field task. In this task, candidates are divided into a group of 3-4 and are made to compete against each other. The GTO explains the rules and the nature of obstacle to the candidate. Each group is given a dummy snake(thick rope) which is to held by each member of the group during the race. The snake should not touch the ground. This also tests the teamwork of the candidates.
  5. Half Group Task(HGT)- This is the final task of the group testing. In this task, the various groups are further divided into 2 or 3 smaller groups (4-6 members) so as to closely judge the leadership skills and teamwork of candidates. Apart from the smaller size of the group, this task is very similar to PGT.

Lecturette- The speaking skills of arm officer must be influential as there might be situations when it is required to motivate his team members and keep them enthusiastic. These skills are being judged by this test. In this test 4 topics of general awareness are written on cards in descending order of toughness. The candidate has to pick up a card, prepare in 2.5 minutes to speak on one of the topics for about 3 minutes. The tough topic is having a larger mark but even if you speak well on easier topics then also you will be evaluated in a better manner.

Individual Obstacle- This is an on-field individual task. This is a test to judge your fitness, stamina and your physical strength. In this task a number of obstacles are being provided like jumping over a slide, long jump, zigzag balance, high screen jump, Burma bridge, jumping through a tire, climbing the wall, Tarzan swing, commando walk, monkey crawl, tiger leap, rope climbing etc. Boys have to complete at least 10 and girls have to complete at least 7. The more obstacle you cross better will be you evaluated.

Command Task- In this test the commanding ability and use of manpower by the candidate are being judged. In this task candidates are made commander one by one, they have to opt 1 (or 2) helpers from the other candidates for performing the task as per the rules.

Final Group Task- This is the last test conducted in SSB. It is conducted to bring the candidates together into a team. This is also similar to PGT in rules and the nature of tasks. In this task, the time given is 10-15 minutes.

Conference- It is the last part of SSB and happens on the last day. In this stage, candidates are called one by one inside the conference room. In the room, all the SSB members including GTO, psychologist, and interviewing officer are sitted in a U-shaped format and the candidate is made to sit in front of them. The board asks some basic question from the candidates and discuss their performances with the 3 assessors.

After some time, the result is being declared. The selected candidates stay at the board for their medical test and if found medically fit, they are selected for the training.

I hope this short summary on SSB interviewing procedure will help the individuals who want to make their carrier as an army officer.

SSB INTERVIEW : An overview

Thanks a lot for your precious time.

Keep Reading, Stay blessed!



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