Advertisement
Quick Links
Advertisement
Subscribe to Our Youtube Channel
Related Manuals for Basler BE1-851
Summary of Contents for Basler BE1-851
- Page 1 Generator Protection Application Guide...
- Page 2 This Guide contains a summary of information for the protection of various types of electrical equipment. Neither Basler Electric Company nor anyone acting on its behalf makes any warranty or representation, express or implied, as to the accuracy or completeness of the information contained herein, nor assumes any responsibility or liability for the use or consequences of use of any of this information.
- Page 3 • Application of Multifunction Numerical Relays needed for current differential protection are less • Typical Settings commonly seen on generators less than 2MVA, • Basler Electric Products for Protection generators rated less than 600V, and generators that are never paralleled to other generation.
- Page 4 If 87G relaying is provided per Fig. 2, relay 51N ance or the system ground impedance is low, the (e.g., Basler relays per Table 2) backs up the fault current decay will be non-linear. For I 87G, as well as external relays. If an 87G is not Fig.
- Page 5 Protection in Fig. 4 consists of a 59N overvoltage produce a ground current of at least 50% of relay and a 27-3N third-harmonic undervoltage generator rated current to provide about 95% or relay (e.g., Basler relays per Table 2). As shown more winding coverage.
- Page 6 GENERATOR NEUTRAL, DROPPING OUT 27-3N. 95% of the generator winding. The selected 59N (Basler relays per Table 2) relay should be The 27-3N performs a valuable monitoring selected so as to not respond to third harmonic function aside from its fault detection function;...
- Page 7 If the 59N relay is only used for alarming, the The Basler BE1-GPS100, BE1-951, BE1-1051, distribution transformer voltage ratio should be and BE1-59N relays contain the required neutral selected to limit the secondary voltage to the overvoltage (59N), undervoltage (27-3N), and maximum continuous rating of the relay.
- Page 8 In Fig. 8, the 51N relay will then see more current than the protective function is labeled 87N, but the Basler other 51N relays. The proper 51N will operate BE1-CDS220 or the BE1-67N is applied. The...
- Page 9 Fig. 10 shows an example of generator current decay for a 3 phase fault and a phase-phase fault. For a 3 phase fault, the fault current decays below the pickup level of the 51 relay in approximately one second. If the time delay of the 51 can be selectively set to operate before the current drops to pickup, the relay will provide 3 phase fault protection.
- Page 10 Fig. 11 to remove any concerns about ability to operate before the generator current drops too low. The voltage feature allows the relays to be set below rated current. The Basler BE1-951, BE1-1051, BE1-GPS100, and BE1-51/27R voltage restrained approach causes the pickup to decrease with decreasing voltage.
- Page 11 If a fault impedance falls within the zone, minimum pickup of the Basler BE1-CDS220 or the relay trips. Multiple zones may be used, with BE1-87G must be raised as the degree of delays on all zones as appropriate for coordinat- performance mismatch increases.
- Page 12 ing when the generator is initially slower than the system. Since motoring can occur during a large reactive-power flow, the real power component needs to be measured at low power factors. The BE1-32R measures real power down to 0.1 pf. The BE1-951, BE1-1051, and BE1-GPS measure real power down to below 0.01 pf, depending on current magnitude.
- Page 13 Thermal Protection Fig. 20 shows the Basler MPS200, BE3-49R, or BE1-49 relay connected to a resistance-tempera- ture detector, embedded in a stator slot. Relay models are available for either copper or platinum FIGURE 18.
- Page 14 VTs on the generator FIGURE 22. LOSS OF FUSE DETECTION, ALTERNATE METHOD. terminals, with the 60FL (Basler BE1-60) com- paring the output of the two VTs. One set Overexcitation and Over/Under Voltage supplies the voltage regulator, the other, the Protection relays.
- Page 15 Fig. 23 shows the relation among the Basler generator manufacturers. The simplest relay BE1-GPS100, BE1-951, BE1051, and BE1-24 application would be a single underfrequency...
- Page 16 PROTECTION USING INSTANTANEOUS can be exceeded with an open phase on a OVERCURRENT RELAY (50). heavily-loaded generator. The Basler BE1-GPS100, BE1-951, BE1-1051, or BE1-46N In Fig. 24 the 5 sec pickup delay on timer 62 relay protects against this condition, providing...
- Page 17 Selective Tripping and Sequential Tripping the relay protects for events external to the generator. The Basler BE1-46N alarm unit will It is a practice at some generators to selectively alert the operator to the existence of a dangerous trip the prime mover, the field, and the generator condition.
- Page 18 FIGURE 29. EXAMPLE OF BARE-MINIMUM PROTECTION (LOW-IMPEDANCE GROUNDING). Fig. 30 shows the suggested minimum protection with low-resistance grounding. It includes differential protection, which provides fast, selective response, but differential protection becomes less common as generator size decreases below 2MVA, on 480V units and below, and on generators that are never paral- leled with other generation.
- Page 19 not sufficiently sensitive to the ground current tor islanding. The under and overvoltage function level. (27/59) detects excitation system problems and some protracted fault conditions. The 51V voltage-controlled or voltage-restrained time overcurrent relay in Fig. 30 is shown on the Fig.
- Page 20 EXAMPLE (HIGH-RESISTANCE GROUNDING). slow for the flashover case, since it must be set to coordinate with external relays and is a last- The Basler BE1-951, BE1-1051, BE1-GPS100, resort backup for external faults. and BE1-59N include a third harmonic under- voltage function (27-3N), that provides supervi-...
- Page 21 Application of Numerical Programmable Relays Numerical programmable relays contain many of the functions discussed in this guideline in a single package. Figures 34 through 37 show the BE1-GPS100 and BE1-CDS220 applied to generator protection. Due to logic complexity, full details are not shown. Details of these applica- tions may be found in the respective instruction manual.
- Page 22 FIGURE 35. BE1-GPS100 APPLIED TO HIGH-IMPEDANCE GROUNDED GENERATOR (HI_Z_GND PREPROGRAMMED LOGIC; SEE INSTRUCTION MANUAL FOR LOGIC DETAILS).
- Page 23 FIGURE 36. BE1-CDS220 APPLIED TO GENERATOR FOR 87 PHASE, 87 NEUTRAL, AND 51 PHASE, NEUTRAL, GROUND, AND NEGATIVE SEQUENCE.
- Page 24 "industrial grade" BE3-XXX relays. (Except the multifunction BE3-GPR is tested to full IEEE C37.90 stan- dards.) Finally, the multifunction utility grade numerical relays are listed. Additional information on each relay is available on the Basler Electric web site, www.basler.com.
- Page 25 Table 1 - Typical Settings IEEE No. Fig. Function Typical Settings and Remarks Overexcitation PU: 1.1*V /60; TD: 0.3; reset TD: 5 alarm P.U.: 1.18*V alarm delay: 2.5s Synchronism Check Max Slip: 6RPM; Max phase angle error: 10° Max V error: 2.5% V Reverse Power PU: turbine 1% of rated;...
- Page 26 Table 1 - Typical Settings IEEE No. Fig. Function Typical Settings and Remarks 51VR Voltage Restrained PU: 175% I ; Curve: VI; TD: 4. Overcurrent Zero Restraint Voltage: 100% V NOM L-L 59N, Ground Overvoltage 59N: 5% V during HV terminal fault; 27-3N, 27-3N: 25% V during normal operation;...
- Page 27 Table 2 - Basler Electric Relay Application Matrix IEEE Single Function Single Function Multifunction (3) X=Included ◊=Optional Number BE1- BE3- ◊ ◊ ◊ ◊ ◊ 27/50IE 50/51B, 50, 27 27, 51 27/59 27/59 27/59 32R, 32O/U ◊ ◊ ◊ ◊...
- Page 28 Revision C.0 June 2001 Basler Electric International Basler Electric Headquarters If you have any questions or need P.A.E. Les Pins, 67319 Wasselonne Cedex Route 143, Box 269, additional information, please contact FRANCE Highland Illinois USA 62249 Basler Electric Company. Phone +33 3.88.87.1010 Phone +1 618.654.2341...
Need help?
Do you have a question about the BE1-851 and is the answer not in the manual?
Questions and answers