reverse power trip diesel generator

But then considerations must be given to data relating to the rate of 'rise & fall' of reverse power levels . Reverse power happens when the generator . Using coal, oil and other resources, with boilers and turbo-steam engines, steam turbine generators can be made, mostly high-speed motors (3000rpm). Previous the generator becomes the motor), the reverse power protects the action circuit breaker from tripping. https://" : " http://");document.write(unescape("%3Cspan id='cnzz_stat_icon_1261919589'%3E%3C/span%3E%3Cscript src='" + cnzz_protocol + "s4.cnzz.com/z_stat.php%3Fid%3D1261919589%26show%3Dpic' type='text/javascript'%3E%3C/script%3E")); The difference between the actual active power of each generator and the calculated value according to the rated power ratio shall not exceed 10% of the rated active power of the generator when the rated power of the generator is the same; when the rated power of the generator is different, Should not exceed 110% of the maximum rated active power of the generator, 20% of the rated active power of the minimum generator, The difference between the actual reactive power of each generator and the calculated value according to the ratio of rated power of the generator, ot exceeding the maximum generator amount, For diesel power plans with frequent load changes and large variation, the above situation should be paid more attention. If there is a large imbalance in power distribution, whether it is active power or reactive power, it will not only affect the efficiency and economy of the genset operation, but also cause the failure of the entire power station. Diesel connected generators are not designed for the function on a sync condense unit. The difference between the actual reactive power of each generator and the calculated value according to the ratio of rated power of the generator not exceeding the maximum generator amount. When the load changes within the range of 20% to . Previous Lo purifier low flow alarm comes and then the purifier back pressure does not come back up and even feed pump pressure drops.This happens after 3 days what could be the reason, Our website uses cookies to improve your experience. regarding a minimum load to prevent reverse power trips of the diesel generator. When the main valve of the turbine generator is closed for some reason, the turbine runs without steam. After a short time limit, the program inverse power protection is formed and the operation is completely stopped. Mar. Mechanical Damage To Diesel Generators, Next var cnzz_protocol = (("https:" == document.location.protocol) ? " Over Speed Protection. The root of the problem is most likely metering errors. though it is extremely difficult to detect reverse current with an alternating current system, Adds: No.2 Xingguang Road, Guxi Industrial Park, Taixing, Jiangsu, China. Copyright Jiangsu Starlight Electricity Equipments Co., Ltd.All Rights Reserved | Sitemap Three phase voltage and two phase current signals need to be collected. Generator inverse power protection refers to that when the turbine loses power due to the main valve closing for some reason, the generator turns into a motor to drive the turbine to rotate. Generator Reverse Power Trip Failure. It will limit the capacity of the generator set, especially for power plants with lower power factor, the load capacity of the genset does not depend on the rated power of the diesel engine, but depends on the rated current value of the generator. Reverse Power Relay is a directional protective relay that prevents/protect the generator from motoring effect (going to reverse direction). Add. Bastiaan Snijder When the generator is in normal operation, A2.When the steam turbine valve is suddenly closed, the active power of the generator is absorbed by the system and the action is greater than the braking amount. Login. The high speed rotation of turbine blade will cause wind wear loss, especially the end blade may cause overheating, resulting in turbine rotor blade damage accident. Enter your email and receive the latest news from us. And even overload the generator. Krel: Reliability coefficient, range 0.5-0.8. By joining you are opting in to receive e-mail. Due to different reservoir capacity and drop, hydro-generators with different capacity and speed can be manufactured. IR readings and temperatures taken regularly, until constant value reach about 1 mega ohms. s electric propulsion device, due to the uneven distribution of active load of the parallel generator, when the ship is sailing at full speed, the total load power is large, often overloading the heavy-duty generator, causing the switch then trips, causing a serious power failure. If the active power distribution of the parallel generator set is seriously unbalanced, when the total load power is large, it is often that one generator set is fully loaded or overloaded, and the other generator is still under light load, so that it cannot be fully utilized. At this point, the generator becomes an electric motor that turns the turbine rotor. The video explains about the generator low forward power and reverse power protections, Class A and Class B trip and shutdown sequence of Boiler-Turbine -Gen. A fuel delivery problem to one genset, such as clogged fuel filter, will cause it to run slower, and it will then receive reverse . While it is the general practice to provide mechanical over speed devices on both steam and hydro turbine, which operate directly on the steam throttle valve or main step valve, it is not usual to backup this . Already a Member? Reasons Of Yuchai Generator Start Smoke Exhaust, Next Registration on or use of this site constitutes acceptance of our Privacy Policy. "Why not the best?" That should get you close enough to avoid a reverse power trip. Moisture should be escaped, by lifting the cover continuously or periodically. Usually when the electrical reverse power limit is reached the generator circuit breaker is tripped but whether that also stops the diesel engine is up to the way the builder wired or programmed the machine. 02.Generator reverse power protection program. Reverse power relays are common in diesel generators, where unburned fuel is both an explosion hazard and a fire hazard. Jimmy Carter. Reverse power protection action characteristics. : No.2, Gaohua Road, Zhengxin Science and Technology Park, Nanning, Guangxi, China. The difference between the actual active power of each generator and the calculated value according to the rated power ratio shall not exceed 10% of the rated active power of the generator when the rated power of the generator is the same; when the rated power of the generator is different, Should not exceed 110% of the maximum rated active power of the generator, 20% of the rated active power of the minimum generator. Work Order 00-00129-00 was performed to troubleshoot the reverse power trip circuit and the governor control circuit. If I read this correctly trace 3 and trace 5 are opposite each other. Reverse power protection is to prevent the generator from reverse power into a motor, driving the turbine rotation, resulting in turbine damage. Thanks. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Exit mode: delay 1.0-1.5s operation, all stop. For example, in a diesel power station of a ship. When the inverse power reaches a certain value, the protective action of the generator is either signaling or tripping. Reverse power protection action characteristics 1.The stator current exceeds the normal value and the ammeter pointer will be severely blocked. reverse power trip can be tested by load shifting with the help of governor control. Reverse power protection is also available for program trip starter elements. 1. But if it drops like 55 or go over 65, then it will trip generator. 8) Reverse Power Trip. the generator becomes the motor), the reverse power protects the action circuit breaker from tripping. The turbine blade rotates at a high speed without steam, which will cause explosive friction, especially the final stage blade, which may cause overheating and damage the rotor blade. Please let us know here why this post is inappropriate. After unloading the generator let the 32 Relay (Reverse Power) arm itself; which is accomplished by sitting unloaded for 45 seconds and adjusting the power factor setting of .97 to .99 on the lag side, this will trip the Turbine/Generator. When the ship stops at the dock, the light load generator enters the reverse power state due to the small total load, causing the reverse power trip, which affects the reliability of the operation of the power station and even the entire ship. The generator may start behaving like a motor if the prime mover is not supplying enough torque to keep the rotor spinning at the same frequency as the connecting bus. Winding short-circuit (wound rotor) Overheating. Nine Mile Point Nuclear Station, P.O. Re: reverse power trip of diesel generator. Generator reverse power protection (electrical trip). Alarms. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. The imbalance of the reactive current tends to occur at the same time as the excitation current imbalance, which causes the excitation system of overload or even cause failure, such as the rotor winding of the generator is burned/ the rectifier diode of the compound excitation device is damaged, etc., and the consequences of such failure are often quite serious. The reverse power trip is to protect the machine driving the generator and also protect the electrical system from having to drive the genetator when it may be . -------------------- After the generator reverse power relay is operated, the auxiliary contact connected with the main valve close will form an "and" door, and the program reverse power protection will be formed after a short time limit, and all stops will occur after the operation. T2000 reverse power relay features Protection of generator prime movers against reverse power. If it still trips, be guided by the voltage shown after closing and set the voltage up a little more. In this case, the turbine generator set is prone to overspeed or even out of control. Then spray the machine with insulation vanish. The imbalance of the reactive load can also be regarded as a kind of ring between the two generators. Normally reverse power setting is kept less than 50% of the motoring power. How Does Yuchai Generator Stand Out Among Many Brands, Installation of Smoke Exhaust in Diesel Generator Room, How Spare Parts of 1000kva Generator Set Are Damaged, E-mail: Reverse Power Protection Working Principle 32R: Reverse power protection is the most Predominate protection in generator/alternator protection. The above situation is sufficient to show that the even distribution of power between generators in parallel operation is not only a problem of economic operation of a generator, but also an important factor to ensure the reliability of power supply of the entire diesel engine power station. 03.Reverse power protection and program reverse power protection difference. To prevent the generator from suddenly disconnecting the main circuit breaker without closing all the main valves under a certain active power, turbo generator may occur overspeed and overspeed accidents. Thank you for helping keep Eng-Tips Forums free from inappropriate posts.The Eng-Tips staff will check this out and take appropriate action. dpc (Electrical) 15 Jul 04 11:57 Metal 3D printing has rapidly emerged as a key technology in modern design and manufacturing, so its critical educational institutions include it in their curricula to avoid leaving students at a disadvantage as they enter the workforce. >Reverse power relay detects the reverse power flow and trips the generator circuit breaker. It can be seen that the uniform distribution of the reactive load and the uniform distribution of the active load have the same meaning. Assemble and out in service with low load, if possible. Establishing that the Generating Set's base load will always be sufficient to absorb the expected levels of reverse power is the first step. Three phase voltage and two phase current signals need to be collected. 25, 2022. So let the protection has command on both generator breaker openning as well as prime mover shut. To avoid such accidents, the steam turbine main valve should be closed after certain types of protection (loss of magnetic protection, out of step protection, generator water cut off, main transformer cooler failure, heat engine protection, etc.). Reverse power protection is a kind of generator relay protection, which is used to protect the turbine generator from abnormal operation when the active power is reversed. 1. > Jacket water high temperature alarm. The capacity of the genset is used to make the performance of the entire power station. The relay monitors the power supply from the generator and in case the generator output falls below a preset value, it quickly activates the trip and disconnects the generator. Often motoring is the worst case for oil pumping. Would appreciate , someone could tell me , the causes of not . There are clear requirements for the power distribution of parallel-operated generator sets in China, when the alternator sets are operated in parallel. Earth fault. I stand corrected, looking at your png file on a cycle by cycle basis, current phase shifted the complete range from 0 to 180 degree, pole slip very likely. Reverse power trip: There is not much difference between an alternator and electric motors from the engineer's perspective. Add. So strictly speaking, reverse power protection is a relay protection of the generator, but mainly to protect the turbine. Electric power & transmission & distribution Forum, http://files.engineering.com/getfile.aspx?folder=899d2369-68a1-4a12-b29c-1f, http://files.engineering.com/getfile.aspx?folder=482c3b28-0a59-49d9-9458-94, http://files.engineering.com/getfile.aspx?folder=269bbfd6-e312-42c4-9d2f-bb, http://files.engineering.com/getfile.aspx?folder=c748289c-94ee-46b1-89d7-4e, http://files.engineering.com/getfile.aspx?folder=30da0872-0698-442d-bb6a-1b, http://files.engineering.com/getfile.aspx?folder=07832cfa-421a-4498-a45c-90, http://files.engineering.com/getfile.aspx?folder=bc831187-896e-4f75-880e-db, Low-Volume Rapid Injection Molding With 3D Printed Molds, Industry Perspective: Education and Metal 3D Printing. During Reverse Power trip simulation of diesel Generator ,observed that the KW meter showing negative KW , still Reverse power trip did not activated. Loss of Field / Excitation (The field in an AC generator consists of coils of conductors within the generator that receive a voltage from a source (called excitation) and produce a magnetic flux). In addition, because of the different working principles of generators, they are divided into DC generators, asynchronous generators and synchronous generators. > Lube oil Sump low level alarm. Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. At this point the generator draws active power from the system, called inverse power. Generally (0.5%~2%) generator rated power, according to the protection device measured when the main valve closed power value. The reactive overcurrent also trips the generator, In addition, the magnitude of the reactive current of the generator is consistent with its excitation current. Dear Gents. Diesel Generator Set. This makes the power to flow the bus bar back to the generator. If the voltage regulation settings are not matched, or a regulator malfunctions, reverse power will occur to the lower-regulated genset. First file actually showed reverse power condition. The reverse power relay settings on HIMAP is 0.0%, ,5 Sec . This is the way how I carry out the reverse power trip.Thank you for supporting this channel. The even distribution of power includes both active power and reactive power. 4.Rotor ammeter pointer fast swing near normal value. 4. Motor Operation. The bottom line is that the prime mover is too powerful to cause the unit to overspeed! To avoid this, for some non-short-circuit fault protection, it first closes the main valve of the turbine after sending out the action signal. But for some reason, when the turbine loses power and the generator outlet switch does not trip, the direction of power changes from the system to the generator, that is, the generator becomes the motor in operation. Dingbo has a wild range of diesel generators:Volvo / Weichai/Shangcai/Ricardo/Perkins and so on,if you need pls contact us. So reverse power protection is actually protection of the turbine without running. This gets feeds from other generators protective devices and will trip the breaker in case there is a problem with generator. The reactive power distribution is uneven, although it will not seriously affect the diesel engine, but the rated value of the generator power is determined according to the apparent power, and the reactive power imbalance will inevitably cause the unbalanced apparent power of the generator. In addition, the magnitude of the reactive current of the generator is consistent with its excitation current. Because of the different forms of primary energy, different generators can be made. Reverse power generally describes a condition where the prime mover of a generator is not supplying sufficient torque to keep the generator rotor spinning at the same frequency as the grid to . 3. this protection device is also used to prevent damage to the prime mover, which might be stopped due to some fault. When the generator has reverse power (the external power points to the generator, i.e. Conversely, when the total load power is small, the imbalance of active power tends to cause active circulation between the generator sets, causing some generator set to switch to the motor state, which is also not allowed for diesel engines. The so-called uniform distribution means that the active power and reactive power of each generator should be proportional to their rated power. Reverse Power Relay >Reverse power relay monitors the direction of power flowing between generator and the load. > Lube oil Low Level Alarm. When the genset has reverse power protection, the reverse power phenomenon will cause the reverse power to trip causing a malfunction. For example, in a diesel power station of a ships electric propulsion device, due to the uneven distribution of active load of the parallel generator, when the ship is sailing at full speed, the total load power is large, often overloading the heavy-duty generator, causing the switch then trips, causing a serious power failure. The main advantage of preferential trip is that it helps in preventing the operation of main circuit breaker trip and loss of power on essential services and thus prevents blackout and overloading of generator. 5. In a fully attended, multi-unit, diesel power station, you might want to keep the engine running for a quick re-energising. Tags: Marine Electrotechnology There are also generators that use solar, wind, atomic, geothermal, tidal and bioenergy. The Various Trips and Alarms In Auxiliary Engines, > Boost air (scavenge air) high temperature alarm, > Alternator bearing high temperature lube oil alarm. The flow sometimes exceeds the load current of the generator and generates additional losses inside the generator. Large diesels have an annoying tendency to pump lube oil when under light load, no load or when motored. The lube oil "slobbered" into the exhaust system is liable to ignite or explode. Learn more. Studies of stability are associated with delta = power angle. 04/08/2014 2:10 PM. However following listed causes can be foreseen for single generator tripping on reverse power: **The most common cause of reverse power tripping is insufficient energy flowing into the prime mover. There are clear requirements for the power distribution of parallel-operated generator sets in China, when the alternator sets are operated in parallel. After the generator inverse power relay is operated, the signal of closing the main valve is formed and the gate is formed. Right? The imbalance of the reactive load can also be regarded as a kind of ring between the two generators. > High Lube oil temperature alarm. Current phase shift is greater than 90 degrees which would put the power into the reverse power quadrant. 7) Lock out Trip. When A2>A1, relay action, after a certain delay, generator cut. *Eng-Tips's functionality depends on members receiving e-mail. Main valve auxiliary contact, open the protection outlet after the main valve is closed, start the unit program trip after a short delay. If it doesn't, the grid will supply . It is used to protect the alternator/generator from motoring action when the turbine failed to give mechanical power. The reverse power protection usually operates to open the breaker using the same coil as any other protective circuit; it's usually in parallel with several other contacts to energize the breaker open coil. The flow sometimes exceeds the load current of the generator and generates additional losses inside the generator. As the power relay senses the reverse power flowing into The generator, it opens the main circuit breaker of no.1 generator. The above situation is sufficient to show that the even distribution of power between generators in parallel operation is not only a problem of economic operation of a generator, but also an important factor to ensure the reliability of power supply of the entire diesel engine power station. > Boost air (scavenge air) high temperature alarm. Hence the reverse power relay avoid the possibility of damages to the generator and also helps stabilize the power system. 2.The pointer of the stator voltmeter will swing rapidly. For diesel power plans with frequent load changes and large variation, the above situation should be paid more attention. Accepts high supply voltage variations: 50 - 110%. Hottest part of the machine shall not exceed 90C, while heating. High precision digital countdown timer for delayed output. the engineered response to 'reverse-power' must be dealt with at the planning stage. Copyright Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. All Rights Reserved |, 300KW Cummins Generator Program Reverse Power Protection, Reasons Of Yuchai Generator Start Smoke Exhaust, What Should Be Done About Yuchai Generators. > FO Leak off alarm. When the generator has reverse power (the external power points to the generator, i.e. The results from the work order . Copyright 1998-2022 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. 2.The pointer of the stator voltmeter will swing rapidly. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Direct Line-Line supply where neutral is not available. The so-called uniform distribution means that the active power and reactive power of each generator should be proportional to their rated power. When the load changes within 20%~100% . Close this window and log in. Action power: same as reverse power protection action value. Trace indicates current from pure power to reactive to reverse power to reactive power back to pure power. Is that the MW trace (red line ) ? +86 134 8102 4441. Parallel connection of diesel generator sets should first meet the requirements of even power distribution. As we all know, the power direction of the generator should flow from the generator direction to the system direction. And weird power factor can imitate loss of field. 2. When a generator is operating in the motoring mode, the machine is consuming active power from the power system and if this active power crosses the set value, then after the set time delay the relay will operate to trip the Breaker.

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