Related Manuals for GE CEX57D
Summary of Contents for GE CEX57D
- Page 1 GEK-49778C INSTRUCTIONS ANGLE-IMPEDANCE RELAY TYPES: CEX57D CEX57E CEX57F GE Meter and Control 205 Great Valley Parkway Malvern, PA 19355-0715...
- Page 2 GEK-49778 By selectin g values for Ts and T R , the characte ristic can be adjusted to be at any This 30 ohm limitation is based on T R distance from 0.5 to 30 ohms from the origin. never being less than ten percent, its minimum recommended value. The angle of maximum torque can be adjusted to be any angle between 5 degrees lead and 35 degrees lead for the top unit.
- Page 3 GEK-49778 where: angle I AB leads V A s angle of maximum torque See Table I I for values of Ts for the various angles of maximum torque. LOWE R UNIT This unit is identical to the upper unit except it is polarized to have maximum torque 180 degrees from the upper unit.
- Page 4 GEK-49778 are connected. For example, if the upper #1 lead is put in the 5 tap, and the lower #1 T R should lead is put in the 60 tap, then the #1 tap setting, T R is 5 plus 6 0, or 65. n ot be set for less than ten percent.
- Page 5 GEK-49778 where: watts, when T R vars, when T R See Table V for values of A and B. TABLE V MAXIMU M TORQUE WATTS JU MPERS 13-14 WATTS VOLTS HERTZ ANGLE (LEAD) AND 15-16 -2. 70 5. 20 -3. 50 5.
- Page 6 GE K-49778 dependent on particular system conditions and configuration. Specific details for determining the settings for transmission line or generator applications can be found in the appropriate instruction book for Type NAA or GSY relays, as mentioned earlier. Once the desired reach and angle has been determined, it is only necessary to calculate and set the restraint taps to meet the desired reach.
- Page 7 GEK-49778 The relay case is suitable for either a semi-flush or surface mounting on al l panels up to two inches thick and appropriate hardware is available. However, panel thickness must be indicated on the relay order to insure that proper hardware will be included.
- Page 8 GEK-49778 ACCEPTANCE TESTS Immediately upon receipt of the relay, an inspection and acceptance test should be made to insure that no damage has been sustained in shipment, and that the relay calibrations have n ot been disturbed. If examination or test in dicates that readjustment is necessary, refer to SERVICING.
- Page 9 GEK-49778 Jumper studs 13 to 14 and Test connections for checking correct unit operation. 15 to 16 . Control Spring Adjustment: Be sure that the relay is level in its upright position. Leave the relay connected as shown in Figure 128, and leave the restraint taps in the 100 percent position.
- Page 10 GE K-49778 Apply percent of rated DC voltage to studs with plus DC on stud Close the left contact of both induction cylinder units. The auxiliary relay should pick up. INST ALL ATION PROC EDURE LOCAT ION The relay should be installed in a location that is clean, dry, free from dust, and well lighted to facilitate inspection and testing.
- Page 11 GEK-49778 All nuts and screws should be tight, particularly on the tap plugs . The felt gasket on the cover should be securely cemented in place in order to keep out dust. Determine the impedance and phase angle seen by the relays. Once the impedance and phase angle is determined, the tap value at which the relay will just operate can be calculated.
- Page 12 GEK-49778 SERVICING If the unit calibrations are found to be out of limits during installation or periodic tests, they should be recalibrated as outlined in the following paragraphs. The calibrations should be made in the laboratory. The circuit components listed below, normally considered as factory adjustments, are used in recalibrating the...
- Page 13 GEK-49778 The relays are shipped from the factory with the maximum torque angle set for five degrees (I leads For a different angle of maximum torque, proceed as f ollows: Connect the relay as shown in Figure 128. Jumper studs 13-14 and studs 15-16 if required. Put basic reach taps in 1.5 ohm tap.
- Page 14 GE K-49778 Set the voltage to the values given in Table VI, and determine the current to just cause the left contact to close. This value should be as shown in Tab 1 e VI. CORE ADJUSTMENT (IF REQUIRED) The core adjustment is made as follows: Adjust the control spring until the moving contact is not touching either the right or left contact when the relay is de-energized.
- Page 17 GE K-49778 UNIT ..BOTTO� !::: <( F igure 3 (0269A3051-0) Relay Characteristic R-X Diagram...
- Page 18 GEK-49778 21-CEX57 ZL-TRANSMISSION LINE TRIPPING FUNCTION Figure 4 (0269A3050-0) R elay Characteristic on Polar Diagram...
- Page 20 GEK-49778 lA-IB IA-Is E AS SCHEMATIC OF ANGLE UNIT IMPEDANCE Figure 6 (0269A3052-0) Schematic of Unit...
- Page 21 GEK-49778 INNER STATOR OR CORE B. MAGNET & COILS C. WAVE WASHERS D. OCTAGON NUT FOR CORE ADJUSTMENT E. FLAT WASHER F. CORE HOLD DOWN NUT (HEXAGON) � Figure (0208A3583-0) Exploded View of Four-Pole Induction Cylinder Unit...
- Page 23 GEK-49778 ± c , UPPtlJ LOWE R �� UPPER _1PPER LOiv'�R LCWER OPER. POL. OPE� POL. * =SHORT FINGER F igure 9 (0269A3036-2) Internal Connection Diagram for Type CEX570 Relays Revised since last issue...
- Page 24 GEK-49778 UPP�LDWER .1cr 1' UPPER · � REST. REST. LOWr:: R LOWER UPPER $ H ORT FINGER Figure 10 (0269A3037-2) Internal Connection Diagram for Type CEX57E Relays Revised since last issue...
- Page 25 GEK-49778 �* /t\* UPPER ---1 � LOWER UPPE 250� UPPER OPE� POL. � * =SHORT FINGER Figure 11 (0269A3038-2) Internal Connection Diagram for Type CEX57F Relays Revised since last issue...
- Page 26 GEK-49778 11!) VOLTS BOTTOM TEST PLUG OHMS POLARITY CHECK l1 5 THREE PHASE, VOLTS, RATED FREQUENCT 1� ( B) PICK-UP AD.JUSTEMENT Figure 12 (K-6556491-1) Test Connections for Type CEX57 Relays...
- Page 28 GEK-49778 OF STUDS NUMBERING (BACK VIEW) 19 17 15 8 " 0 0 8 o g�l61412 GLASS 0 0000 00000 086 42 OUTLINE (S MM SCREWS I0-32X .21 8 (1 4 5.781 8.00 203MM 1�.00 I. 75 (406MM) (293MM) (19MM) 11,9D2 20HO (BOTHE .