0000018401 00000 n Reverse Power (32) 91. Some of the typical nominal voltage ratings are; 110, 230, 277, 380, 415 and 480 volts, and 2, 4, 6, 8 and 10 A or 5 A nominal current. 0000006837 00000 n siemens. The tripping activates the circuit breaker which in turn de-energizes the circuit that may otherwise feed power to the generator. Bridging the Gap Between Data Science & Engineer: Building High-Performance T How to Master Difficult Conversations at Work Leaders Guide, Be A Great Product Leader (Amplify, Oct 2019), Trillion Dollar Coach Book (Bill Campbell). reverse power trip can be tested by load shifting with the help of governor control. 105% of 600A =600 * 1.05. 58.5OUTPUT AT COS =0- UNDER EXCITED (MVAR) 67%OUTPUT LIMIT WITH 1 COOLER SECTION OUT OF SERVICET=0.8% / KOUTPUT AT DEVIATING COLD AIR TEMPERATURE 30 SHORT TIME ( K= I22 t)10%CONTINUOUS LOAD UNBALANCE PERMISSIBLE I2 OUTPUT AND ALLOWABLE LOAD UNBALANCE V84.2 GENERATOR TYPE TLRI 93/33-36 COS=0.85 Generator Protection Setting Calculations Typical settings for the trip point are between 2 and 20 percent and selected according to application. = 630A. The device should be able to operate in a wide variety of temperatures typically between 0 and 60 degrees Celsius. The user should select a setting of 0.5 times the value of the measured motoring energy. Hope it helped. The voltage coil has a high inductance, designed in a way that the voltage lags the current in the coil by about 90 degrees. The positive sign of active power is defined by the power sign setting. Figure 2: Construction of a reverse power relay | image: brighthubengineering.com. Thanks for reading, do not hesitate to leave your impressions or asking questions in the comments section! The three phase relay are available either as 3 phase 4 wire relays, or a 3 phase 3 wire relays. We can offer other protective devices to serve your protection needs. D However, the intentional time delay to prevent maloperation is not an ideal solution. M``%cQC}`zA!1yV Blockchain + AI + Crypto Economics Are We Creating a Code Tsunami? By accepting, you agree to the updated privacy policy. 0000031571 00000 n It means for 800A 78.75%. Is it posiable to obsorb the reverse power rather than tripping a breaker with known back feed power amount ie secondary protection for a solar system 5kw. APIdays Paris 2019 - Innovation @ scale, APIs as Digital Factories' New Machi Mammalian Brain Chemistry Explains Everything. By comparing the Z2measured to thresholds, this new element yields the fault direction. Published on May 2020 | Categories: Documents | Downloads: 32 . Generator & System Data: . In the design of electrical power systems, the ANSI Standard Device Numbers denote what features a protective device supports (such as a relay or circuit breaker). Tap here to review the details. Hc```f``YxAX, ,"%l8Y]-,k[wl+]23{/W&E.!_tJfF1UjanwJ?t . 0000005973 00000 n For the primary test, the reverse power should be measured with the actual protection. The selection should be based on the existing control panel and mounting available. 0000035216 00000 n So what did you think about this back to basics on reverse power relays? 0000005189 00000 n 0000004398 00000 n 0000034479 00000 n Student, Police line, Anti Sesater's Putra Favorit '09, 1. Power protection. SEL-501-2 Settings Sheets. %PDF-1.2 % The motoring power for large steam turbines can be a very small fraction of the power rating, leading . Instant access to millions of ebooks, audiobooks, magazines, podcasts and more. We've updated our privacy policy. Under normal condition when power is flowing as expected, the trip contacts of the relay are open, and the disc is against a stop. Activate your 30 day free trialto unlock unlimited reading. Thanks for the helpful post. 0000032999 00000 n The reverse power relay measures the phase voltage (L - N operation) and the current of that . Generator is a 2MW gas turbine unit connected to the main 4.16kV bus though a feeder breaker. Reverse power relays are utilised to trip turbine generators to avoid prime mover damage and directional relay is most widely used as the main protection for these conditions. Use for TRIP. Figure 1: Parallel connection of generator and utility power | image: 2.bp.blogspot.com. 0000005167 00000 n Reverse power relay settings are normally determined based on an analysis of the power system at the site, including the type of prime mover (a steam turbine in your case), auxiliary loading, transformer capabilities, and system (grid) capabilities. Conversely, if the relay set in Reverse direction means if a fault occurs in reverse zone then only relay operates. It is important to detect a reverse power condition and disconnect power as quickly as possible, and even though the gas turbines and diesel engines may not get damaged immediately, there is always a risk of explosion or fire from the unburned fuel. THEORY AND PRINCIPLES . 1"+@\3Ca(b0I@b5N0h0R0hU& With the 64S Series R' setting originally set to zero, the relay is now measuring the resistance due to earthing . endstream endobj 1115 0 obj <>/Metadata 77 0 R/OpenAction 1116 0 R/Outlines 1140 0 R/PageLayout/SinglePage/PageMode/UseOutlines/Pages 1112 0 R/StructTreeRoot 121 0 R/Type/Catalog>> endobj 1116 0 obj <> endobj 1117 0 obj <>/MediaBox[0 0 595.32 841.92]/Parent 1112 0 R/Resources<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 1118 0 obj <>stream Enjoy access to millions of ebooks, audiobooks, magazines, and more from Scribd. Say current setting of the relay is 150 % therefore pick up current of the relay is 1 150% = 1.5 A. Step-3 Now we have to calculate PSM for the specified faulty current level. Must conform to international standards such as- IEC 144 / BS 5420 / VDE/VDI 0435 / IEC 947 / EN60947. For that, we have to first divide primary faulty current by CT ratio to get relay faulty current. Reverse Power Relay >Reverse power relay monitors the direction of power flowing between generator and the load. From a system standpoint, motoring is defined as the flow of real power into the generator acting as a motor. 3.2 Calculation of the Setting Value at Reverse Power Should the relay, for instance, trip at a generator re-verse power of 10 %, this does not mean that the set-ting value of the XP2-R is 10 %. Settings for this protection are provided in Table 7. 0000034760 00000 n 0000034875 00000 n Download. Thanks for the post, it was very helpful. 630/800= 0.7875. yes ,it give signal to the governor to cut off the fuel. To get desired reverse power protection, it is important to pay attention to various parameters of the relay to use. 106 0 obj << /Linearized 1 /O 108 /H [ 1188 484 ] /L 342649 /E 35524 /N 24 /T 340410 >> endobj xref 106 39 0000000016 00000 n DphS`n9 t@@ll C#!\5F#X 9d1h\T 7L#aD["L . Thanks for sharing this post..Very use full information about electrical.. Also can you explain about below mentioned article. ANSI . A time delay is associated with the protection. 6 D. Steven Mill. I chose to write about selecting a reverse power relay and I hope it will help you all! Relays acted: 32R Flag operation at Protection panel. 0000004420 00000 n The reverse power relay is a directional protective relay that prevents power from flowing in the reverse direction. Real power measurement can prevent damage due to reverse power flow, such as generator motoring caused by loss of prime mover torque. 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Selecting a reverse power relay: Below are some of the factors to consider when selecting the reverse power relay: Sensitivity of the Reverse power relay. This can DIL rail mounting, wall, or panel mount. ANSI code for Reverse power protection: 32R. 0000032977 00000 n This may be enough to do a "it works at near the expected power so it is OK" test. The relay monitors the power from the generator and in case the generator output falls below a preset value, it quickly disconnects the generator coil to avoid power from flowing into the stator coil. possible ratio without exceeding the 5.0 ampere rating of the relay. 0000033766 00000 n . For instance, reducing the steam flow in steam turbines can . A Mazumder, Current transformer is useful in such a way that it produces an alternating current in its secondary winding which is proportional to the current measured in its primary winding. No problem. 630A is what percent of 800A. Reverse power relay and Watt hour meter have the same mechanic construction,but opposite direction to operate.Reverse power relay need back ward current flow to make contact closed then trip circuit,Watt-hour meter need forward current flow to count watt hour. Most of the relays have adjustable settings for both the sensitivity and the time delay. Either way, it requires power to supply the coils. Advantages of reverse power relay Prevents power from flowing in the reverse direction and damaging the generator stator Prevents damage to the prime mover I will update once I identify the . The relay monitors the power from the generator and trips when a preset value is exceeded, hence preventing the generator from motoring. These settings may be re-evaluated during the commissioning, according to actual and measured values. Kindly help me regarding reverse power trip.Surveyor asks how shall u test reverse power trip on board.He dont want to listen by stimulation.He wants conventional method practically.Suppose i am doing it infront of a surveyor onboard.Kindly sent me the answer to my mail. E A!'^O2. And if you do, read it anyway just to check if you really do! The generator output can fail due to problems with the prime mover, turbine or engine that drives the generator, issues with speed controller, or different frequencies during synchronization. CT output for 100 % Load will be = 2.31 Amps. [ you can alter the relay setting to be above & below the available watts]. SEL-501 Settings for General Purpose Timer Applications. If a reverse power starts to flow, the disc rotates in the opposite direction, moves away from the stop and towards the trip contacts that activates the trip circuit. Now customize the name of a clipboard to store your clips. Proper coordination of relays is important to attenuate unnecessary outages. Differential Protection of Power Transformer in Substation, Generator Static Protection System (GSX-10) Upgrade, Generator protection by bhushan kumbhalkar, Blackout Avoidance & Undervoltage Load Shedding, Littelfuse - Protection Relays & Controls, Symmetrical Components Fault Calculations, Generator Protection By - Er Rahul Sharma, Protection of three phase synchronous generator, Line differential protection 7 sd52x 7sd610. Date Code: 20220113 . 0000001131 00000 n %%EOF >If the prime mover is a turbine the reverse power pick up setting of 2-3% >If the prime mover is diesel setting range of 5-15% is adopted. A.N , one of the member of the community take us back to basics with this article about reverse power relay. This . Generator ProtectionGenerator Protection Table 7 Power protection settings. A generator can work as a synchronous compensator if the driving torque is less than the total losses in the system, taking necessary power from the network. trailer << /Size 145 /Info 105 0 R /Root 107 0 R /Prev 340399 /ID[<3a0891d96212e147e55c0675f3c6dbdb><3a0891d96212e147e55c0675f3c6dbdb>] >> startxref 0 %%EOF 107 0 obj << /Type /Catalog /Pages 102 0 R >> endobj 143 0 obj << /S 487 /Filter /FlateDecode /Length 144 0 R >> stream This paper presents shortcircuit analysis and relay coordination of overcurrent relays of a radial power grid of 1149.441MVasc Jl8!B%30AP)PQEItJj"7E|H7#M]lFt8fFpm)0sJv{b m'C.osWf|ZA"+ZL! The self powered relays have the advantage of being simpler and requiring no auxiliary power supply which can lead to malfunction when unavailable or low in the case of batteries. Most of the reverse power relays have an adjustable setting to accommodate a wide range of applications. You can read the details below. Reverse active power protection calculates the active power with the RMS values of the voltages and currents. A 5 second time delay is often used to avoid tripping the circuit during synchronization. In most of the manual modes, the reset is done by pressing a push button or by disconnecting the supply voltage for a short period of about one second. %PDF-1.6 % Power protection is used to avoid reverse active power direction. The other magnet has a current coil from supplied from a current transformer connected to the same phase as the voltage in the upper electromagnet. 25 9-2014 design and development of micro-controller base differential protec 3. For example, a rate of change of frequency function or a reverse power function can be created. I was looking for some guidance on the pickup and time delay settings for a reverse power relay located on the main breaker of a facility which contains Co-Generation. Protection selectivity is partly considered in this report and could be also re-evaluated. 0000019808 00000 n 0000001650 00000 n Download. Relays and circuit breakers are the heart of the modern large interconnected power system. The ANSI 37 function is similar to the ANSI 32 function, but it takes in account the magnitud of the power flowing out of generator, and trip if the value is inferior to a setting. This can damage the prime mover and is therefore undesirable. = 210 MW Terminal Voltage = 15.75KV/110V Synchronous reactance Xd = 2.05 pu = 2.05 x 15.75 x 15.75/247 MVA = 2.058 ohm. Some relays are instantaneous whiles others have inbuilt time delay mechanisms. In most practical applications, the reverse power settings are between 8 to 15 percent for diesel engines and between 2 and 6 percent for turbine power movers. Figure 1: Reverse power relay operating characteristics | image: yourelectrichome.blogspot.com. 86M Gen Master Trip Relay Opted; Restart the machine and increase the input power to the turbine as quickly as possible within low forward power time setting. It was very interesting and well-written so I thought I would give my contribution too about this topic. 1154 0 obj <>stream 1125 0 obj <>/Filter/FlateDecode/ID[<6CB84106221969428BB48536C22E0B35><3B149B6BD4ADE14A9BDD826C65A2C3D5>]/Index[1114 41]/Info 1113 0 R/Length 80/Prev 778587/Root 1115 0 R/Size 1155/Type/XRef/W[1 3 1]>>stream when the load has shifted sufficiently from the generator to be offloaded (nearly 10% of the max rated ), reverse power relay will open the acb of the same generator. Typical settings for the trip point are between 2 and 20 percent and selected according to application. The display shows Range is from 4% to 20% at steps of 1% Press the increment and decrement key to make the desired setting. The Over & Under Voltage Relay OUV400 is designed to monitor the voltage levels of the power system and provides a relay operation in event of an over or . Reverse power occurs when the energy flow-rate into the generator prime mover isn't sufficient to keep the generator spinning at synchronous (rated) speed. 0000032755 00000 n 0000035103 00000 n The upper electromagnet is wound with a voltage coil which is then supplied from one phase and an artificial neutral of the generator output. Generator Protection -Setting Calculations Generator is not affected by motoring (runs like a synchronous motor) Turbine can get damaged Since the example generator is driven by a gas turbine (10 to 15%) the reverse power relay pickup is set at 8% Time delay is set at 30 sec. There are relays that are entirely manual and must be reset manually, while others are fully automatic requiring no operator intervention and others a hybrid with both manual and automatic options. Click here to review the details. You have set the current limit as 2.3A in relay. The relay provides circuit-breaker control, additional primary switching devices (grounding switches, transfer switches and isolating switches) can also be controlled from the relay. Generator protection calculations settings. This is the time it takes the relay to disconnect the power once the preset condition is met. If Z2measured is less than threshold ZF2, the fault is forward. Conventionally denotes that forward direction refers to power flow away from the busbar (towards the protected zone), while reverse direction refers to power flowing towards the busbar. 1114 0 obj <> endobj Relay Settings in Real Power System: Requirements And Consideration. Automation or PLC logic functionality is also implemented in the relay. [9/Zvb!r7&O5{Z2::A&$h 3 E AM#jcR# +> 2b|3V`a` 0000002968 00000 n Press the set key to store the value. 0000003721 00000 n From current setting we calculate the trick current of the relay. The reverse power relays provide a means of protecting generators connected in parallel with other generators or utility power systems. Tamper-proof design for setting protection; . Clipping is a handy way to collect important slides you want to go back to later. The display changes as shown Rgds A time delay is included so to prevent the false tripping due to transients associated with synchronization or other momentarily disturbances. 0000002182 00000 n Phase current = 400/1.732 = 231 Amps. If Z2measured is greater than threshold ZR2, the fault is reverse. Generator Protection - Setting Calculations Generator is not affected by motoring (runs like a synchronous motor) Turbine can get damaged Since the example generator is driven by a gas turbine (10 to 15%) the reverse power relay pickup is set at 8% Time delay is set at 30 sec. Generator Protection Sample Relay Setting Calculations - The sample calculations shown here illustrate steps involved in calculating the relay settings for . hV[o0+~" TEi#5d$M@tj\fin>>7#\x"'c@HF4 This should be adjustable to allow the selection of the optimum point and prevent false tripping. mI` 3ptX` b lX endstream endobj 144 0 obj 375 endobj 108 0 obj << /Type /Page /Parent 101 0 R /Resources 109 0 R /Contents [ 112 0 R 114 0 R 116 0 R 118 0 R 120 0 R 122 0 R 132 0 R 134 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 109 0 obj << /ProcSet [ /PDF /Text ] /Font << /F2 129 0 R /F4 125 0 R /F6 123 0 R /F11 110 0 R >> /ExtGState << /GS1 141 0 R /GS2 142 0 R /GS3 135 0 R >> >> endobj 110 0 obj << /Type /Font /Subtype /Type1 /Name /F11 /Encoding /MacRomanEncoding /BaseFont /Helvetica-Bold >> endobj 111 0 obj 686 endobj 112 0 obj << /Filter /LZWDecode /Length 111 0 R >> stream Directional Relay Characteristics: Setting the generator protective relay functions (photo credit: ase.cz) A good starting point is to compile the data needed for setting the various generator protective functions. The same sign is used for active power measurement. Date Code: 20220113 . For this to happen, it makes or breaks the contacts depending on whether they are normally open or closed. The sensitivity varies from one application to the other and diesel engines require a setting of between 8 and 15 percent, while the turbine power movers require a lower setting of between 2 and 6 percent. The DG set is not connected to the grid but to an isolated load and its governor is in droop mode. Date Code: 20220113 . Once the parallel power is disconnected by the reverse power relay, it will require to be reset when the operation reverts back to normal. The trip point is usually adjustable to between 2 and 20 percent of the input current while the time delay is adjustable from 0 to 20 seconds. The relay is made of a lightweight non-magnetic aluminum disc between two soft laminated iron core electromagnets, and fixed on a spindle running on low friction bearings. 0000002990 00000 n l;. /":0JCz$AdE\KllkmhQsvcqtBJLH(I)lp-+twd@Rl@3.G.<6S$G k&)=H!'X@8$p;TKt-OT. The relay is used in installations where a generator runs in parallel with the utility or another generator so as to prevent power from the bus bar or another generator from flowing back to the active generator when its output fails. Therefore the New PSM value is = 0.7875. Typical frequencies are 50, 60 and 400Hz. Free access to premium services like Tuneln, Mubi and more. The relays can operate in either de-energize or energize mode. endstream endobj startxref Setting is calculated: P set = 5% *P prime_mover /S gen = -5% 2590/3200kVa = 4%. Reverse power protection - ( 32.1G & 32.2G . Most of the reverse power relays have adjustable settings to allow the customer do the settings according to the installed equipment. Looks like youve clipped this slide to already. This helps in selecting the suitable relay with the ability to provide a repeatable and reliable operation, hence protecting the generator and other equipment in the system. 0000033744 00000 n 0000005951 00000 n In addition, the relay should be able to withstand storage temperatures of between 10 and 70 degrees Celsius. A reverse power relay is a protective transmitter that protects the turbine or motor from damage upon a reverse power condition. The relay will show the pick -up value in input kilowatts, but the setting is done in percent of the nominal apparent power S N. SN CTRatedPrimary VTRatedPrimary 3 Example Let us say that the pick-up target value for reverse power stage P< 32R is 5 % of the rated active input power of the motor. 0000035295 00000 n 0000034557 00000 n Based on the trans-former transformation ratio, the switch-ing point has to be calculated.