blast blanket reverse side (that was facing away …apic/uploads/forum/blast blanket tests on...

BLAST BLANKET

REVERSE SIDE (THAT

WAS FACING AWAY

FROM THE BLAST)

BLAST BLANKET TEST 1

-40000

-30000

-20000

-10000

0

10000

20000

30000

40000

50000

1 139 277 415 553 691 829 967 1105 1243 1381 1519 1657 1795 1933

TIME

V,

A,

psi

Time s

Current A

Voltage V

Pressure psi

Sensor1_t °C

Sensor2_t °C

Sensor1 cal/cm²

Sensor2 cal/cm²

TEST 1 – FAULT CURRENT

GRAPH

BB TEST 1

-20

0

20

40

60

80

100

120

140

160

180

1 353 705 1057 1409 1761 2113 2465 2817 3169 3521 3873 4225 4577 4929 5281 5633 5985 6337

TIME

C,

PS

I

Pressure psi

Sensor1_t °C

Sensor2_t °C

Sensor1 cal/cm²

Sensor2 cal/cm²

TEST1: PRESSURE GRAPH

Test 1- Readings CURRENT : 24.04 KA (Total r.m.s.)

Current (Peak): 40.01 kA

Arc Voltage: 953.3 V

Duration: 133.4 ms

I2t =77.18 kA2 sec

V*I *t= -2.410 MJoules

Maximum Top Pressure Sensor: no readings

Maximum Bottom Pressure Sensor: 160 psi

Sensor 1- Cal/ cm2: 4.17

Sensor 2 – Cal /cm2: 4.33

Sound Meter: placed at 56.6 feet away readings over meter range (>140dB)

BB DIVERTER

2nd TEST

500 kva Transformer with Regel filled Termination

4 TELEPOSTS

FOUR 25 KA

OBERON

BLANKETS

ONE 40 KA

SALISBURY

BLANKET

WRAPPED

AROUND THE HV

COMPARTMENT

TELEPOSTS

TEST -2 SET UP

FAULT ON PHASE 2 IN HV

COMPARTMENT

HV COMPARTMENT FILLED WITH

REGEL

FAULT CURRRENT: 25 KA FOR 8

CYCLES

TEST VOLTAGE: 4 KV

Test 2 -videos

Play normal speed video: Test 10-2796

EPCOR\Blast Blanket Testing - June

2010\Normal Video\Test_10-2796.avi

Play HS video: Test HS:10-2796 EPCOR\Blast Blanket Testing - June 2010\HS

Video\HS10-2796.cine

Termination cover

hanging to the

transformer from the

corner bolts.

Burnt Regel material

on the floor

Salisbury blanket on the

floor

Salisbury blanket

completely charred

and edges ripped.

Centre lead melted and

broken

Oberon Blanket

smoked

Burnt Regel

material splash

READINGS TEST1 TEST2 TEST3 TEST4

P1 (Top) - - 266 1251

P2 (Lower) 160 109 230 1063

Cal 1 Cal/cm2 4.17 3.25 3.73 5.24

Cal 2 Cal/cm2 4.33 3.55 3.72 5.35

Arc Voltage v 953 1054 567 1780

I peak kA 40.01 37.72 52.472 34.12

Duration ms 133 140 135 8.47

I2t kA2sec

V*I*t MJoules

77.18

-2.410

73.26

-2.857

94.39

-1.576

5.259

-0.3154

Sound db >140 >140 >140 133

Recommended Method 1

Oberon arc s. blankets

Teleposts

When Blast Energy can be

directed to the sidewalk

Recommended Method 2

2 Oberon arc s.

blankets Teleposts

Oberon Blankets

Forming a wall

When Blast Energy cannot be

directed to the sidewalk