Supporting_References.pdf

ATTACHMENT #1

This sheet predicts targets on BE1-87T when testing with two single phase test sets, with the relay set at user's final settings.

-- Enter data in yellow fields only. Range cell becomes red if out of range data is entered.

-- Input "1" and "2" are used for reference, but each can refer to any of the relay's 3 phase inputs. There up to three 3 phase inputs on a BE1-87T.

-- This sheet does not support back to back delta compensation (e.g., DAB-DAC and DAC-DAB compensation jumper configurations).

RELAY SETTINGS (Red range cell flags bad data) Range

Nominal Amp Rating of Inputs

% Slope

Minimum Pick-Up (MPU)

Input 1 Tap

Input 1 Compensation Jumper

Input 2 Tap

Input 2 Compensation Jumper

5 5 or 1

25 15-60, steps of 5

0.35 Normally 0.35

2 2.0-8.9 or 0.4-1.78 d1 Y, D1, D2

6 2.0-8.9 or 0.4-1.78 y Y, D1, D2

MULTIPLES OF TAP (MOT) FOR TEST 0.87

Suggest repeating test at 0, 1, 3, and 5 MOT. Selecting 0 MOT means the spreadsheet gives min. pickup. Higher MOT might be tested but max. continuous rating of relay is 20A.

INITIAL CURRENT INJECTION VALUE

Initially inject into Input 1 (amps): 1.74 < 0

Initially inject into Input 2 (amps): 5.22 < 180

TEST SET CONNECTIONS AND EXPECTED

TARGETS

Connect polarity/non-polarity of the two test set sources to the indicated phase on relay, or the relay common non-polarity as indicated by the matrix below. See IM Section 5 for examples..

Intermediate Calculations:

Test # 1 (87PH-A) Relay Ph A Pol Relay Ph B Pol Relay Ph C Pol Relay NonPol When increasing input 1, % Slope is exceeded at:

Relay Input 1:

Test Set 1

Polarity

N.C. N.C.

Test Set 1 NonPol.

When decreasing input 1, % Slope is exceeded at:

Relay Input 2:

Test Set 2

Polarity

NonPol.

N.C. N.C. When increasing input 2, % Slope is exceeded at:

Phases that give targets at trip level: Phase A Phase B When decreasing input 2, % Slope is exceeded at:

Test # 2 (87PH-B) Relay Ph A Pol Relay Ph B Pol Relay Ph C Pol Relay NonPol When increasing input 1, Min Operate is exceeded at:

Relay Input 1: N.C.

Test Set 1

Polarity N.C.

Test Set 1 NonPol.

When decreasing Input 1, Min Operate is exceeded at:

Relay Input 2: N.C.

Test Set 2

Polarity

Test Set 2 NonPol.

N.C.

When increasing input 2, Min Operate is exceeded at:

Phases that give targets at trip level: Phase B Phase C When decreasing Input 2, Min Operate is exceeded at:

Test # 3 (87PH-C) Relay Ph A Pol Relay Ph B Pol Relay Ph C Pol Relay NonPol

Relay Input 1: N.C. N.C.

Test Set 1

Polarity

Test Set 1 NonPol.

Relay Input 2:

NonPol.

N.C.

Test Set 2

Polarity N.C.

Phases that give targets at trip level: Phase A Phase C

As Found

TRIP OCCURS AT THESE CURRENTS:

Increasing Input 1 current:

Decreasing Input 1 current:

Increasing Input 2 current:

Decreasing Input 2 current:

Nominal +/- Range

Test 1

Test 2 Test

2.44 0.246 2.19 2.69

1.04 0.162 0.88 1.20

7.32 0.539 6.78 7.86

3.12 0.287 2.83 3.41

OK; all listed test currents are below the maximum continuous rating of the relay (20A).

BE1-87T, 3 Phase, Testing With 2 Single Phase Current Sources

RELAY SETTINGS (Red range cell flags bad data)

Range

Current Inputs, Per Unit of Tap:

Input 1, Ph A

Mag. Intermediate Calculations

Nominal Amp Rating of Inputs 5 or 1

0.550 0

% Slope

Minimum Pickup (MPU), per unit

Input 1 Tap

D1, D2 Jumper Compensation Equations:

D1, D2

15-60, steps of 5

See Cell Comment

2.0-8.9 or 0.4- 1.78

Y, D1, D2

2.0-8.9 or 0.4- 1.78

Input 1, Ph B

0.550 Input 1, Rectangular format Equations

0.35 Input 1, Ph C

0.550 120 Real Imag Real Angle

Input 2, Ph A

0.500 150 A 0.5500

0.2750

0.2750

0.0000

0.4763

D1;1A-1C

D1;1B-1A

0.8250

0.8250

0.4763

0.4763

0.9526

Input 1 Compensation Jumper Y

Input 2, Ph B

0.500 30 B 0.9526

-30.0

150.0

Input 2 Tap d2

Input 2, Ph C

Restraint, with Compensation Jumper Effects

0.500 -90 C 0.4763 D1;1C-1B 0.0000 0.9526 0.9526 90.0

Input 2 Compensation Jumper Y, D1, D2 D2;1A-1B 0.8250

0 D2;1B-1C 0.0000

0.8250

0.4763

0.9526

0.9526 30.0

Input 1, A Comparator

0.550 0.9526 -90.0

Input 1, B Comparator

0.550 -120

INJECTED CURRENT AT INPUT 1 Input 1, C Comparator

0.550 120

D2;1C-1A

D1, D2 Equations

0.4763 0.9526 150.0

(Single phase entry sufficient) Mag. Angle

Input 2, Rectangular format

Input 2, A Comparator

0.866 180 A 0.4330 0.2500 D1;2A-2C

0.4330 0.7500 0.8660 120.0

Current @ Input 1, Ph A 1.1 0 Input 2, B Comparator

0.866 60 B 0.4330 0.2500

0.5000

D1;2B-2A

Current @ Input 1, Ph B 1.1 -120

1.1 120

Input 2, C Comparator

Effective Restraint (Largest Restraint x Slope)

0.866 -60 C 0.0000 D1;2C-2B

0.8660

0.4330

0.0000

0.7500

0.8660

0.8660

0.0

120.0

Current @ Input 1, Ph C D2;2A-2B

0.8660 0.0000 0.8660 180.0

A Comparator

INJECTED CURRENTS AT INPUT 2

Mag.

0.217 D2;2B-2C 0.4330

B Comparator

0.217 D2;2C-2A 0.4330

0.7500

0.7500

0.8660 60.0

Angle

0.8660 -60.0

Current @ Input 2, Ph A 3 150

Current @ Input 2, Ph C 3 -90

C Comparator

Mag. Operate Current (Restraint 1 - Restraint 2)

A Comparator

0.217 Convert Restraint to Rectangular format

Current @ Input 2, Ph B 3 30 X

0.5500

0.2750

0.2750

0.8660 j Y

0.0000

B Comparator -0.4763

C Comparator 0.4763

Trip? (I Op>MPU? & I Op>Restraint?)

A Comparator

0.0000

No B

0.4330 0.7500

B Comparator No C

0.4330 -0.7500

C Comparator No Sum Restraint to find Operate Current

ATTACHMENT #2

This sheet predicts tripping of a BE1-87T for a set of two user-defined CT secondary current inputs -- Enter data in yellow fields only. Blue cells are calculated by the spreadsheet.

-- Input 1 and 2 are used for reference; each can refer to any of the relay's 3-phase inputs. There up to three 3-phase inputs on a BE1-87T.

-- The spreadsheet reproduces the differential calculations of the BE1-87T to assist in determining if a trip should occur for a given test current.

-- Range cells will be green normally, but turn red to flag out-of-range settings.

-- Recall the relay expects current reversal across the xfmr, so balanced currents are shifted by 150, 180, or -150 degrees in most applications. For instance, for balanced 3 phase current, current at Input 2 should be shifted by 180deg if jumpers are Y-Y, +150deg if jumpers are Y-D1, and -150deg if jumpers are Y-D2.

0.316 Input

A

0.316 B

0.316

C

Input

A

X j Y Mag Angle

Sum 1A+2A 0.3160 0.0000

0.3160

180.0

1B+2B 0.1580 0.2737 0.3160 60.0

1C+2C

0.1580 -0.2737 0.3160

-60.0

BE1-87T, 3 Phase, Differential Calculations, Arbitrary Isec.

ATTACHMENT #3

SUBSTATION PICTURES