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41-116K

9

Type COV Voltage
Controlled Overcurrent Relay

ENERGY REQUIREMENTS

VOLTAGE UNIT

Frequency

Drop-Out

Adjustment

Volts

Maximum

Volts

Continuous

Volt-

Burden

at 120 Volts

Drop-Out

Ratio

60
50

80-100
80-100

132
132

8.0
7.2

98%
98%

+ Volt-Ampere burden is average for the various settings

COV-6 OVERCURRENT UNITS

60 HZ VOLT AMPERES ** (x

 FOR 50 Hz)

Ampere

Range

Tap

Continuous

Rating

(Amperes)

One 

Second 

Rating*

(Amperes)

Power

Factor

Angle Ø

At Tap

Value

Current (

= .86)

At 3

Times

Tap Value

Current

(

= .88)

At 10

Times Tap

Value

Current

(

= .90)

At 20 

Times 

Tap 

Value 

Current

(

= .91)

0.5/2.5

0.5

2.7

88

69

3.92 20.6

103

270

0.6

3.1

88

68

3.96

20.7

106

288

0.8

3.7

88

67

3.96

21

114

325

1.0

4.1

88

66

4.07

21.4

122

360

1.5

5.7

88

62

4.19

23.2

147

462

2.0

6.8

88

60

4.30

24.9

168

548

2.5

7.7

88

58

4.37

26.2

180

630

2/6

2

8

230

67

3.88

21

110

308

2.5

8.8

230

66

3.90

21.6

118

342

3

9.7

230

64

3.93

22.1

126

381

3.5

10.4

230

63

4.09

23.1

136

417

4

11.2

230

62

4.12

23.5

144

448

5

12.5

230

59

4.20

24.8

162

540

6

13.7

230

57

4.38

26.5

183

624

4/12

4

16

460

65

4.00

22.4

126

376

5

18.8

460

63

4.15

23.7

143

450

6

19.3

460

61

4.32

25.3

162

531

7

20.8

460

59

4.37

26.4

183

611

8

22.5

460

56

4.40

27.8

204

699

10

25

460

53

4.60

30.1

247

880

12

28

460

47

4.92

35.6

288

1056

*

Thermal capacities for short times other than one second may be calculated on the basis of time being inversely proportional to

the square of the current.

Ø Degrees current lags voltage at tap value current.

**

Voltages taken with Rectox type voltmeter

Summary of Contents for COV Series

Page 1: ...s a flux which divides and returns through the outer legs A shading coil causes the flux through the left leg to lag the main pole flux The out of phase fluxes thus produced in the air gap cause a contact closing torque The electromagnet for the COV 11 relay has a main coil consisting of a tapped primary winding Two iden tical coils on the outer legs of the lamination structure are connected to th...

Page 2: ...rolled Overcurrent Relay Sub 4 183A047 Sub 6 183A048 Figure 1 Internal Schematic of the COV Relay in the Type FT 21 Case Figure 2 Internal Schematic of the COV Relay with the Indicating Instantaneous Trip Unit in the Type FT 21 Case ...

Page 3: ... aluminum cylinder assembled to a molded hub which holds the shaft The shaft has removable top and bottom jewel bearings The shaft rides between the bottom pin bearing and the upper pin bearing with the cylinder rotating in an air gap formed by the electromagnet and the magnetic core The stops for the moving ele ment contact arm are an integral part of the bridge The bridge is secured to the elect...

Page 4: ... time dial position or by tap setting and a specific time of operation at some current mul tiple of the tap setting e g 4 tap setting 2 time dial position or 4 tap setting 0 6 seconds at 6 times tap value current To provide selective circuit breaker operation a mini mum coordinating time of 0 3 seconds plus breaker time is recommended between the relay being set and the relays with which coordinat...

Page 5: ...el panel mounting or to the terminal stud furnished with the relay for thick panel mounting The terminal stud may be easily removed or inserted by locking two nuts on the stud and then turning the proper nut with a wrench For detail information on the FT case refer to Instruc tion Leaflet 41 076 6 0 ADJUSTMENTS AND MAINTENANCE The proper adjustments to insure correct operation of this relay have b...

Page 6: ... that the 1 30 times tap value current be maintained accurately The main taining of this current accurately is necessary because of the steepness of the slope of the time current characteristic Figure 7 page 16 A 1 vari ation in the 1 30 times tap value current including measuring instrument deviation will change the nominal operating time by approximately 4 Table 1 shows the time curve calibratio...

Page 7: ...on the time dial when the stationary contact has moved through approximately one half of its normal deflection Therefore with the stationary contact resting against the backstop the index mark is offset to the right of the O mark by approximately 020 The placement of the various time dial positions in line with the index mark will give operating times as shown on the respective time current curves...

Page 8: ...nit is made as follows With the moving contact in the normally closed position i e against the left stop on bridge screw in the stationary contact until both con tacts just close as indicated by a neon lamp in the contact circuit Then screw the stationary contact in towards the moving contact an addi tional one half turn The clamp holding the stationary contact housing need not be loosened for the...

Page 9: ...67 3 96 21 114 325 1 0 4 1 88 66 4 07 21 4 122 360 1 5 5 7 88 62 4 19 23 2 147 462 2 0 6 8 88 60 4 30 24 9 168 548 2 5 7 7 88 58 4 37 26 2 180 630 2 6 2 8 230 67 3 88 21 110 308 2 5 8 8 230 66 3 90 21 6 118 342 3 9 7 230 64 3 93 22 1 126 381 3 5 10 4 230 63 4 09 23 1 136 417 4 11 2 230 62 4 12 23 5 144 448 5 12 5 230 59 4 20 24 8 162 540 6 13 7 230 57 4 38 26 5 183 624 4 12 4 16 460 65 4 00 22 4 1...

Page 10: ...174 552 2 5 7 7 88 56 4 38 25 9 185 640 2 6 2 8 230 66 4 06 21 3 111 306 2 5 8 8 230 63 4 07 21 8 120 342 3 9 7 230 63 4 14 22 5 129 366 3 5 10 4 230 62 4 34 23 4 141 413 4 11 2 230 61 4 34 23 8 149 448 5 12 5 230 59 4 40 25 2 163 530 6 13 7 230 58 4 62 27 183 624 4 12 4 16 460 64 4 24 22 8 129 392 5 18 8 460 61 4 30 24 2 149 460 6 19 3 460 60 4 62 25 9 168 540 7 20 8 460 58 4 69 27 3 187 626 8 22...

Page 11: ... 5 200 675 2 5 7 7 88 53 2 74 24 8 228 800 2 6 2 8 230 70 2 38 21 136 360 2 5 8 8 230 66 2 40 21 1 142 395 3 9 7 230 64 2 42 21 5 149 430 3 5 10 4 230 62 2 48 22 157 470 4 11 2 230 60 2 53 22 7 164 500 5 12 5 230 58 2 64 24 480 580 6 13 7 230 56 2 75 25 2 198 660 4 12 4 16 460 68 2 38 21 3 146 420 5 18 8 460 63 2 46 21 8 158 480 6 19 3 460 60 2 54 22 6 172 550 7 20 8 460 57 2 62 23 6 190 620 8 22 ...

Page 12: ...48 13 95 160 0 610 2 6 2 0 7 0 230 32 073 6 30 74 0 264 2 5 7 8 230 30 0 78 7 00 78 5 285 3 0 8 3 230 27 0 83 7 74 84 0 309 3 5 9 0 230 24 0 88 8 20 89 0 340 4 0 10 0 230 23 0 96 9 12 102 0 372 5 0 11 0 230 20 1 07 9 80 109 0 430 6 0 12 0 230 20 1 23 11 34 129 0 504 4 12 4 0 14 460 29 0 79 7 08 78 4 296 5 0 16 460 25 0 89 8 00 90 0 340 6 0 17 460 22 1 02 9 18 101 4 378 7 0 18 460 20 1 10 10 00 110...

Page 13: ...41 116K 13 Type COV Voltage Controlled Overcurrent Relay Sub 3 418246 Figure 4 Typical 50 and 60 Hz Time Curves of COV 6 Overcurrent Unit ...

Page 14: ...41 116K 14 Type COV Voltage Controlled Overcurrent Relay Sub 3 418247 Figure 5 Typical 50 and 60 Hz Time Curves of COV 7 Overcurrent Unit ...

Page 15: ...41 116K 15 Type COV Voltage Controlled Overcurrent Relay Sub 4 418248 Figure 6 Typical 50 and 60 Hz Time Curves of COV 8 Overcurrent Unit ...

Page 16: ...41 116K 16 Type COV Voltage Controlled Overcurrent Relay Sub 2 418249 Figure 7 Typical 50 and 60 Hz Time Curves of COV 9 Overcurrent Unit ...

Page 17: ...41 116K 17 Type COV Voltage Controlled Overcurrent Relay 288B655 Sub 2 Figure 8 Typical Time Curves of COV 11 Overcurrent Unit 50 60 Hertz ...

Page 18: ...41 116K 18 Type COV Voltage Controlled Overcurrent Relay 183A172 Sub 2 Figure 9 Diagram of Test Connections of the Overcurrent Unit ...

Page 19: ...41 116K 19 Type COV Voltage Controlled Overcurrent Relay 183A171 Sub 5 Figure 10 External Schematic of the Type COV Relay on a Generator ...

Page 20: ...ype COV Voltage Controlled Overcurrent Relay 184A471 Sub 3 Figure 11 Relay Types COV 6 COV 7 COV 8 COV 9 COV 11 Voltage Controlled Overcurrent Relay Double Trip with Indicating Instantaneous Trip in Type FT21 Case ...

Page 21: ...41 116K 21 Type COV Voltage Controlled Overcurrent Relay 184A400 Sub 2 Figure 12 Relay Types COV 6 COV 7 COV 8 COV 9 Voltage Controlled Overcurrent Relay Double Trip In TypeFT 21 Case ...

Page 22: ...41 116K 22 Type COV Voltage Controlled Overcurrent Relay NOTES ...

Page 23: ...41 116K 23 Type COV Voltage Controlled Overcurrent Relay NOTES ...

Page 24: ...rcurrent Relay ABB Automation Inc 4300 Coral Ridge Drive Coral Springs Florida 954 752 6700 Printed in U S A visit our website at www abbus com papd 57 D 7901 Sub 17 Figure 13 Outline and Drilling Plan for the Type COV Relay in Type FT 21 Case ...

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