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BE1-51/27R - General Information

Integrating Timing

Timing option Z3 and the characteristic curves available for that option uses integrating timing. Integrating
timing is accomplished by summing time increments that are based on the magnitude of the applied multiple
of pickup current, the time curve characteristic selected, and the time dial value. These time increments are
summed until a predetermined value is exceeded, then a time trip output signal is generated.

This type of integrating time delay characteristic simulates the operating characteristics of an
electromechanical overcurrent relay.

Built-In Test

A built-in test (BIT) switch mounted on the Logic Board provides diagnostic troubleshooting and calibration
in conjunction with the procedures provided in Service Manual, publication 9 1372 00 620.

OPTIONS

Timing

An extended timing option multiplies by approximately 5.7, the standard time delays. The resulting curves
are shown following the standard curves—e.g., Figure 1-2 is timing type B1 and Figure 1-3 is the timing type
B1 with extended timing range.

When timing option Z1, Z2, or Z3 is specified, a printed circuit board mounted selector switch allows a choice
of up to sixteen different time overcurrent functions. Timing option Z1 or Z3 may be further specified as stan-
dard or extended time, depending upon option 2 selection.

Sensing Input Type

When single-phase, two-phase-and-neutral, three-phase, or three-phase-and-neutral sensing has been
specified, the front panel TAP selector and the front panel TAP CAL control set the pickup point for all
phases. An independent front panel TAP (NEUTRAL) selector and front panel CAL (NEUTRAL) control
set the neutral pickup point. Also, for three-phase-and-neutral sensing units, one of the seven sensing input
range combinations must be specified.

Relay circuits provide a voltage restraint circuit that varies the selected time overcurrent pickup point
proportional to the monitored voltage. As the monitored voltage varies between 100 percent and 25 percent
of nominal, the pickup point for each phase varies between 100 percent and 25 percent. Nominal voltage
is 100 Vac for 50 hertz systems and 120 Vac for 60 hertz systems. Neutral time overcurrent elements are
not restrained. Three-phase voltages are measured phase-to-phase for three wire connections and phase-
to-neutral for four wire connections.

Sensing Input Range

For three-phase-and-neutral sensing units, input ranges are:

0.5 to 4.0 amperes (phase and neutral)

1.5 to 12 amperes (phase) and 0.5 to 4.0 amperes (neutral)

0.5 to 4 amperes (phase) and 1.5 to 12 amperes (neutral)

1.5 to 12 amperes (phase and neutral)

0.1 to 0.8 amperes (phase and neutral)

0.3 to 2.4 amperes (phase) and 0.1 to 0.8 amperes (neutral)

0.3 to 2.4 amperes (phase and neutral)

For all other units, two ranges are available. They are 0.5 to 12 amperes and 0.1 to 2.4 amperes.

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Summary of Contents for BE1-51/27R

Page 1: ...INSTRUCTION MANUAL FOR TIME OVERCURRENT RELAY WITH VOLTAGE RESTRAINT MODEL BE1 51 27R Publication 9 1372 00 999 Revision B 09 99...

Page 2: ...rocedures presented in this manual INTRODUCTION This Instruction Manual provides information concerning the operation and installation of BE1 51 27R Time Overcurrent with voltage restraint Relays To a...

Page 3: ...ctric Co Highland IL 62249 September 1999 It is not the intention of this manual to cover all details and variations in equipment nor does this manual provide data for every possible contingency regar...

Page 4: ...ions 1 8 Style Number Identification Chart 1 9 Time Overcurrent Characteristic Curves 1 12 SECTION 2 HUMAN MACHINE INTERFACE Controls And Indicators 2 1 SECTION 3 FUNCTIONAL DESCRIPTION 3 1 General 3...

Page 5: ...ement Backup Settings 4 20 SECTION 5 TESTS AND ADJUSTMENTS 5 1 General 5 1 Required Test Equipment 5 1 Operational Test 5 1 Preliminary Instructions 5 1 Time Overcurrent Pickup Test 5 5 Timed Output T...

Page 6: ...uipped with differential protection Phase overcurrent units should be supplied on all three phases Either three single phase relays or one three phase relay when the objective is to protect for phase...

Page 7: ...e same as the setting At voltages below 25 percent of nominal the pickup will be 25 percent of the setting Note that the BE1 51 27R is designed to trip at currents less than the setting if the voltage...

Page 8: ...0 377 0 506 0 649 0 831 1 50 6 00 0 159 0 220 0 285 0 347 0 474 0 599 0 790 1 75 7 00 0 151 0 204 0 263 0 320 0 435 0 553 0 727 2 00 8 00 0 142 0 191 0 246 0 300 0 412 0 520 0 683 2 25 9 00 0 136 0 1...

Page 9: ...2 741 3 610 4 443 4 50 18 00 0 958 1 392 1 818 2 243 2 667 3 514 4 328 5 00 20 00 0 944 1 372 1 786 2 200 2 619 3 454 4 252 STANDARD FEATURES Time Overcurrent Time overcurrent elements pick up over a...

Page 10: ...n integrating inverse time with extended timing range Nine integrating I2 T with extended timing range Characteristic curves are shown by the graphs in Figures 1 2 through 1 70 Note that each graph i...

Page 11: ...pon option 2 selection Sensing Input Type When single phase two phase and neutral three phase or three phase and neutral sensing has been specified the front panel TAP selector and the front panel TAP...

Page 12: ...ernally operated Outputs Optional normally opened normally closed or SPDT auxiliary output contacts may be selected Contacts actuate when the timed output relay is energized Internally operated front...

Page 13: ...or phase 0 5 to 4 0 A for neutral E N O outputs Z1 Sixteen position switch selects B and C curves B1 B8 and C1 C8 time overcurrent characteristic curves P Operating power derived from 125 Vdc or 100 1...

Page 14: ...BE1 51 27R General Information 1 9 Figure 1 1 Style Number Identification Chart...

Page 15: ...Tap value VN Nominal voltage V Applied voltage level Time Overcurrent Dropout Better than 92 of pickup level Ratio Instantaneous Overcurrent Continuously adjustable over the range of 1 to 40 times th...

Page 16: ...seconds carry 7 A continuously and break 0 3 A 500 Vdc Make and carry 15 A for 0 2 seconds carry 7 A continuously and break 0 1 A Inductive 120 240 Vac Make and carry 30 A for 0 2 seconds carry 7 A co...

Page 17: ...time overcurrent functions individually as options or selected by switch if the Z1 Z2 or Z3 timing option is specified Z1 option can select any of the timing types designated as B1 through B8 and C1 t...

Page 18: ...BE1 51 27R General Information 1 13 Figure 1 2 Timing Type B1 Short Inverse Drawing No 99 0932 Figure 1 3 Timing Type B1 Short Inverse With Extended Timing Range Drawing No 99 0944...

Page 19: ...1 14 BE1 51 27R General Information Figure 1 4 Timing Type B2 Long Inverse Drawing No 99 0931 Figure 1 5 Timing Type B2 Long Inverse With Extended Timing Range Drawing No 99 0946...

Page 20: ...BE1 51 27R General Information 1 15 Figure 1 6 Timing Type B3 Definite Time Drawing No 99 0933 Figure 1 7 Timing Type B3 Definite Time With Extended Timing Range Drawing No 99 0942...

Page 21: ...1 16 BE1 51 27R General Information Figure 1 8 Timing Type B4 Moderately Inverse Drawing No 99 0930 Figure 1 9 Timing Type B4 Moderately Inverse With Extended Timing Range Drawing No 99 0945...

Page 22: ...BE1 51 27R General Information 1 17 Figure 1 10 Timing Type B5 Inverse Drawing No 99 0929 Figure 1 11 Timing Type B5 Inverse With Extended Timing Range Drawing No 99 0943...

Page 23: ...1 18 BE1 51 27R General Information Figure 1 12 Timing Type B6 Very Inverse Drawing No 99 0928 Figure 1 13 Timing Type B6 Very Inverse With Extended Timing Range Drawing No 99 0941...

Page 24: ...BE1 51 27R General Information 1 19 Figure 1 14 Timing Type B7 Extremely Inverse Drawing No 99 0927 Figure 1 15 Timing Type B7 Extremely Inverse With Extended Timing Range Drawing No 99 0940...

Page 25: ...1 20 BE1 51 27R General Information Figure 1 16 Timing Type B8 I2 T Drawing No 99 0926 Figure 1 17 Timing Type B8 I2 T With Extended Timing Range Drawing No 99 0947...

Page 26: ...BE1 51 27R General Information 1 21 Figure 1 18 Timing Type C1 I2 T With Limit 1 Drawing No 99 0956 Figure 1 19 Timing Type C1 I2 T With Limit 1 and Extended Timing Range Drawing No 99 0948...

Page 27: ...1 22 BE1 51 27R General Information Figure 1 20 Timing Type C2 I2 T With Limit 2 Drawing No 99 0957 Figure 1 21 Timing Type C2 I2 T With Limit 2 and Extended Timing Range Drawing No 99 0949...

Page 28: ...BE1 51 27R General Information 1 23 Figure 1 22 Timing Type C3 I2 T With Limit 3 Drawing No 99 0958 Figure 1 23 Timing Type C3 I2 T With Limit 3 and Extended Timing Range Drawing No 99 0950...

Page 29: ...1 24 BE1 51 27R General Information Figure 1 24 Timing Type C4 I2 T With Limit 4 Drawing No 99 0959 Figure 1 25 Timing Type C4 I2 T With Limit 4 and Extended Timing Range Drawing No 99 0951...

Page 30: ...BE1 51 27R General Information 1 25 Figure 1 26 Timing Type C5 I2 T With Limit 5 Drawing No 99 0960 Figure 1 27 Timing Type C5 I2 T With Limit 5 and Extended Timing Range Drawing No 99 0952...

Page 31: ...1 26 BE1 51 27R General Information Figure 1 28 Timing Type C6 I2 T With Limit 6 Drawing No 99 0961 Figure 1 29 Timing Type C6E I2 T With Limit 6 and Extended Timing Range Drawing No 99 0953...

Page 32: ...BE1 51 27R General Information 1 27 Figure 1 30 Timing Type C7 I2 T With Limit 7 Drawing No 99 0962 Figure 1 31 Timing Type C7E I2 T With Limit 7 and Extended Timing Range Drawing No 99 0954...

Page 33: ...1 28 BE1 51 27R General Information Figure 1 32 Timing Type C8 I2 T With Limit 8 Drawing No 99 0963 Figure 1 33 Timing Type C8E I2 T With Limit 8 and Extended Timing Range Drawing No 99 0955...

Page 34: ...BE1 51 27R General Information 1 29 Figure 1 34 Timing Type E2 BS 142 Long Inverse Drawing No 99 1093 Figure 1 35 Timing Type E4 BS 142 Inverse 1 3 Sec Drawing No 99 1094...

Page 35: ...1 30 BE1 51 27R General Information Figure 1 36 Timing Type E5 BS 142 Inverse 2 9 Sec Drawing No 99 1095 Figure 1 37 Timing Type E6 BS 142 Very Inverse Drawing No 99 1096...

Page 36: ...BE1 51 27R General Information 1 31 Figure 1 38 Timing Type E7 BS 142 Extremely Inverse Drawing No 99 1097...

Page 37: ...R General Information Figure 1 39 Timing Type B1 Short Inverse With Integrated Algorithm Drawing No 99 1397 Figure 1 40 Timing Type B1 Short Inverse With Integrated Algorithm and Extended Timing Drawi...

Page 38: ...neral Information 1 33 Figure 1 41 Timing Type B2 Long Inverse With Integrated Algorithm Drawing No 99 1399 Figure 1 42 Timing Type B2 Long Inverse With Integrated Algorithm and Extended Timing Drawin...

Page 39: ...R General Information Figure 1 43 Timing Type B3 Definite Time With Integrated Algorithm Drawing No 99 1401 Figure 1 44 Timing Type B3 Definite Time With Integrated Algorithm and Extended Timing Drawi...

Page 40: ...Information 1 35 Figure 1 45 Timing Type B4 Moderately Inverse With Integrated Algorithm Drawing No 99 1403 Figure 1 46 Timing Type B4 Moderately Inverse With Integrated Algorithm and Extended Timing...

Page 41: ...51 27R General Information Figure 1 47 Timing Type B5 Inverse With Integrated Algorithm Drawing No 99 1405 Figure 1 48 Timing Type B5 Inverse With Integrated Algorithm and Extended Timing Drawing No...

Page 42: ...neral Information 1 37 Figure 1 49 Timing Type B6 Very Inverse With Integrated Algorithm Drawing No 99 1407 Figure 1 50 Timing Type B6 Very Inverse With Integrated Algorithm and Extended Timing Drawin...

Page 43: ...neral Information Figure 1 51 Timing Type B7 Extremely Inverse With Integrated Algorithm Drawing No 99 1409 Figure 1 52 Timing Type B7E Extremely Inverse With Integrated Algorithm and Extended Timing...

Page 44: ...1 27R General Information 1 39 Figure 1 53 Timing Type B8 I2 T With Integrated Algorithm Drawing No 99 1411 Figure 1 54 Timing Type B8E I2 T With Integrated Algorithm and Extended Timing Drawing No 99...

Page 45: ...7R General Information Figure 1 55 Timing Type C1 I2 T Limit 1 With Integrated Algorithm Drawing No 99 1413 Figure 1 56 Timing Type C1E I2 T Limit 1 With Integrated Algorithm and Extended Timing Drawi...

Page 46: ...neral Information 1 41 Figure 1 57 Timing Type C2 I2 T Limit 2 With Integrated Algorithm Drawing No 99 1415 Figure 1 58 Timing Type C2E I2 T Limit 2 With Integrated Algorithm and Extended Timing Drawi...

Page 47: ...7R General Information Figure 1 59 Timing Type C3 I2 T Limit 3 With Integrated Algorithm Drawing No 99 1417 Figure 1 60 Timing Type C3E I2 T Limit 3 With Integrated Algorithm and Extended Timing Drawi...

Page 48: ...neral Information 1 43 Figure 1 61 Timing Type C4 I2 T Limit 4 With Integrated Algorithm Drawing No 99 1419 Figure 1 62 Timing Type C4E I2 T Limit 4 With Integrated Algorithm and Extended Timing Drawi...

Page 49: ...7R General Information Figure 1 63 Timing Type C5 I2 T Limit 5 With Integrated Algorithm Drawing No 99 1421 Figure 1 64 Timing Type C5E I2 T Limit 5 With Integrated Algorithm and Extended Timing Drawi...

Page 50: ...neral Information 1 45 Figure 1 65 Timing Type C6 I2 T Limit 6 With Integrated Algorithm Drawing No 99 1423 Figure 1 66 Timing Type C6E I2 T Limit 6 With Integrated Algorithm and Extended Timing Drawi...

Page 51: ...7R General Information Figure 1 67 Timing Type C7 I2 T Limit 7 With Integrated Algorithm Drawing No 99 1425 Figure 1 68 Timing Type C7E I2 T Limit 7 With Integrated Algorithm and Extended Timing Drawi...

Page 52: ...neral Information 1 47 Figure 1 69 Timing Type C8 I2 T Limit 8 With Integrated Algorithm Drawing No 99 1427 Figure 1 70 Timing Type C8E I2 T Limit 8 With Integrated Algorithm and Extended Timing Drawi...

Page 53: ...es the terminal connections high or low used to select the current sensing input range Refer to Table 2 2 for sensing input ranges D TIME DIAL NEUTRAL If present Determines the time delay between sens...

Page 54: ...2 2 BE1 51 27R Human Machine Interface Controls And Indicators Figure 2 1 Location of Controls and Indicators...

Page 55: ...INST 1 trip setting over the range of 1 to 40 times the selected phase time overcurrent pickup TAP value P INST 1 NEUTRAL Control Options 1 1 and 1 2 Only A four turn potentiometer provides adjustmen...

Page 56: ...0 0 8 9 13 14 15 16 Neutral 0 75 1 00 1 50 1 75 2 25 2 50 3 00 3 25 3 75 4 00 17 18 Range 4 Three Phase and Neutral Phase 0 75 1 00 1 50 1 75 2 25 2 50 3 00 3 25 3 75 4 00 8 9 13 14 15 16 Neutral 2 2...

Page 57: ...with Limit 2 9 1 20 1 21 1 57 1 58 C3 I2 T with Limit 3 A 1 22 1 23 1 59 1 60 C4 I2 T with Limit 4 B 1 24 1 25 1 61 1 62 C5 I2 T with Limit 5 C 1 26 1 27 1 63 1 64 C6 I2 T with Limit 6 D 1 28 1 29 1 6...

Page 58: ...power supplies A benefit of this new design increases the power supply operating ranges such that the 48 125 volt selector is no longer necessary Specific voltage ranges for the three new power suppli...

Page 59: ...3 2 BE1 51 27R Functional Description Figure 3 1 Functional Block Diagram...

Page 60: ...the required time delay before the timed output relay will be energized Time delay characteristics are shown in the curves located in Section 1 If extended timing range options 2 D or 2 E is present...

Page 61: ...aneous overcurrent element will always be from 1 to 40 times above the front panel TAP and TAP NEUTRAL settings of the time overcurrent element If target type A or B is present the front panel INST 1...

Page 62: ...propriate target indicator Each indicator is tripped regardless of the current level of the trip circuit Current Operated Targets This target will operate only when a minimum of 0 2 A flows in the out...

Page 63: ...relay is disconnected from the operating circuit and will not provide system protection Always be sure that external operating monitored conditions are stable before removing a relay for inspection t...

Page 64: ...m each relay To prevent an inductive overload of the relay contacts it is necessary to break the trip circuit externally through the 52a contacts Relay circuitry is connected to the case terminals by...

Page 65: ...BE1 51 27R Installation 4 3 Figure 4 2 Typical Sensing External Connections Sensing Input Type M or N Figure 4 3 Typical Sensing External Connections Sensing Input Type R or S...

Page 66: ...4 4 BE1 51 27R Installation Figure 4 4 Typical Sensing External Connections Sensing Input Type U or W Figure 4 5 Typical Sensing External Connections Sensing Input Type B or C...

Page 67: ...BE1 51 27R Installation 4 5 Figure 4 6 Typical Sensing External Connections Sensing Input Type E or F Figure 4 7 Typical Sensing External Connections Sensing Input Type Y or Z...

Page 68: ...ses the power supply operating ranges such that the 48 125 volt selector is no longer necessary Specific voltage ranges for the three new power supplies and a cross reference to the style number ident...

Page 69: ...BE1 51 27R Installation 4 7 Figure 4 8 Typical Internal Diagram Sensing Input Type M or N...

Page 70: ...4 8 BE1 51 27R Installation Figure 4 9 Typical Internal Diagram Sensing Input Type Y or Z With Power Supply Status...

Page 71: ...BE1 51 27R Installation 4 9 Figure 4 10 Typical Internal Diagram Sensing Input Type B or C With Power Supply Status...

Page 72: ...4 10 BE1 51 27R Installation Figure 4 11 Typical Internal Diagram Sensing Input Type R or S With Power Supply Status...

Page 73: ...BE1 51 27R Installation 4 11 Figure 4 12 Typical Internal Diagram Sensing Input Type E or F With Power Supply Status...

Page 74: ...4 12 BE1 51 27R Installation Figure 4 13 Typical Internal Diagram Sensing Input Type U or W With Power Supply Status...

Page 75: ...for a solidly grounded system Lower settings are appropriate and safe for impedance grounded systems or for ungrounded protected equipment connections When choosing the time delay setting in a genera...

Page 76: ...4 14 BE1 51 27R Installation Figure 4 14 Relay Signals and Current Pickup Example For 3 Phase Fault XE 0 65 X D...

Page 77: ...ay Signals and Current Pickup Example For 3 Phase Fault XE 2 X D Setting Example Figure 4 16 illustrates generator relay elements that are to be set in this example Plant 11 kV feeders are supplied by...

Page 78: ...51 27R elements must coordinate The currents are the changes resulting from the fault assuming a driving point voltage of 11 kV Actual currents will be the sum of the table values plus the pre fault l...

Page 79: ...6 960 7 6 Relay 51 time at 7 6 multiples from B6 curves 08 time dial 0 31 seconds Set 51 27 relay pickup 1 75 3700 11 1 73 340 A Primary 340 300 5 5 7 A Secondary Set 51 27 relay time to provide 0 3 s...

Page 80: ...current and any pre fault load current will add to the fault current values For a phase to phase fault the decay will be less Steady state level calculation 67 multiples at steady state level with T2...

Page 81: ...aker R fails to interrupt the fault Redundant line relaying will minimize the need for generator tripping Use of a breaker failure timer set at 0 25 seconds would avoid generator tripping for failure...

Page 82: ...milar CT saturation during an external three phase fault In a like manner the time setting of the time overcurrent element must ride through this transient resulting from CT saturation Ground current...

Page 83: ...BE1 51 27R Installation 4 21 Figure 4 18 Panel Drilling Diagram Semi Flush Mounting Figure 4 19 Outline Dimensions Semi Flush Mounting...

Page 84: ...vsd 09 02 99 DETAIL A A SHOWING THE ADDITION OF WASHERS OVER THE BOSS TO TIGHTEN THE RELAY AGAINST THE PANEL CASE PANEL Figure 4 20 Panel Drilling Diagram Projection Mounting Rear View Figure 4 21 Ou...

Page 85: ...stment is listed below Refer to Figures 5 1 through 5 6 for test setups a Appropriate ac or dc power source for relay operation b Appropriate ac source 50 or 60 Hz as appropriate for voltage and curre...

Page 86: ...with Neutral Sensing Refer to Figure 5 5 Ensure that the timed output terminals 1 and 10 are connected Also verify that either A B or current sense terminals are connected initially N terminals will b...

Page 87: ...BE1 51 27R Tests And Adjustments 5 3 Figure 5 2 Test Setup for Sensing Input Type R or S Three Phase Sensing Figure 5 3 Test Setup for Sensing Input Type U or W Three Phase with Neutral Sensing...

Page 88: ...BE1 51 27R Tests And Adjustments Figure 5 4 Test Setup for Sensing Input Type B or C Three Phase Delta Configuration Figure 5 5 Test Setup for Sensing Input Type E or F Three Phase with Neutral Sensi...

Page 89: ...el TAP selector to A Step 3 Adjust the test set for an overcurrent threshold having one of the following values a 0 5 A for relays with Sensing Input Range 1 2 or 4 b 1 5 A for relays with Sensing Inp...

Page 90: ...b Sensing Input Type Y or Z Two Phase and Neutral Sensing Remove the power and reconnect the input sensing to the remaining phases as shown in Figure 5 6 each time repeating Steps 1 through 10 For neu...

Page 91: ...the overcurrent threshold toward the value of the front panel TAP NEUTRAL selector J setting until the front panel TIMING NEUTRAL indicator just illumi nates Do not disturb this setting Step 21 Recor...

Page 92: ...y value in seconds should be within 5 of the timer reading from step 7 2 Step 10 Adjust the front panel TIME DIAL to 40 60 and 99 each time repeating Steps 6 through 9 Step 11 Remove the power and rec...

Page 93: ...us Overcurrent Pickup Test This test checks the minimum overcurrent pickup points for Instantaneous 1 and if present Instantaneous 2 outputs Step 1 Perform the preliminary instructions Step 2 Reconnec...

Page 94: ...sensing connect the relay as shown in Figures 5 3 and 5 5 then repeat Steps 2 through 11 substituting the following a The front panel TAP NEUTRAL selector instead of the front panel TAP selector Step...

Page 95: ...fol lows a Sensing Input Type M or N Refer to Figure 5 1 Because the relay front panel TIMING indicator provides the needed pickup indication do not connect the test setup to the output terminals The...

Page 96: ...TAP CAL control fully CW Step 7 Apply current to the relay Step 8 Slowly adjust the front panel TAP CAL control CCW until the front panel TIMING indicator just illuminates which indicates the desired...

Page 97: ...opriate curve plot upward from the multiples of pickup current value until the horizontal line opposite the desired time delay time in seconds is reached The setting curve nearest the plot point shoul...

Page 98: ...panel NEUTRAL TIME DIAL c For a lesser overcurrent difference from the pickup point the time delay will be greater so that for a multiple of 3 times the pickup current the time delay for the previous...

Page 99: ...meter Step 13 Remove the input current Step 14 Reset the INST TARGET if present Step 15 If the overcurrent threshold reading from Step 13 was too high or low adjust the front panel INST 1 NEUTRAL cont...

Page 100: ...s required 1 Relay model and style number 2 Relay serial number 3 Board or assembly a Part number b Serial number c Revision letter 4 The name of the board or assembly STORAGE This protective relay co...

Page 101: ...ase terminals the test plug is inserted with the numbers 1 through 10 facing up Similarly when using the test plug in the upper part of the relay the numbers 11 through 20 are faceup It is impossible...

Page 102: ...of the B and C curves in Section 1 Changed Specifications Time Overcurrent Pickup Accuracy Time Overcurrent Dropout Ratio and Isolation Added formula for pickup current and Chart 1 1 Instantaneous Re...

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