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EMSD Annual Technical

Seminar

Thursday, 10 November 2016

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Ir K F Yee BEng(Hons), MSc(Eng), CEng, FCIBSE, FIET, FEI, FBSOMES MHKIE, RPE (BSS, ELL, ENY, FRE), REW(C0, H0), RSO, RSA, REA Committee Member and Honorary Treasurer (2007 – Present) The Hong Kong Institution of Engineers – Building Services Division Recognized Trainer of EMSD - CPD Scheme for REW Committee Member (2001-2007) HKIE - Safety Specialist Committee (HKIE-SSC) Past President (2008-2010) Building Services Operation and Maintenance Executives Society (BSOMES) Hon. Secretary (2015-2016) Energy Institute Hong Kong (EIHK)

:

1. ,

2.

3.

4.

5. Q&A

2004 6 29

•

2013 11 15

•

•

•

•

•

•

1.

2.

3.

•

•ACB

CT

•

CT

• CONTROL FUSE FUSE

40

CONCON

UPSBATTERY CHARGER ;

•

•

•

•

•CABLE GLAND

: 2000A (Elbow Busduct)

:

• 2 x 2500A ACBs + 1 x 2000A ACBs tripped at 1220 hrs • 25/F to 39/F • 5/F to 15/F • 8

2000A (BUSDUCT)

: 15/F , 7/F , (dead short)

2000A (BUSDUCT) 1.

2. 3. 4. ( )

2000A (BUSDUCT)

2000A (BUSDUCT)

2000A (BUSDUCT)

: 2000A (Busduct) 2000A Busduct Elbow Burnt Incident

:

1. ( /)

2. 3. (THERMAL

SCANNING)

: 3200A (Busduct)

:

• ,

3200A

:

3200A

: 1. 2. 3.

3200A

: 630A (VCB)

:

• 1 (HV) 550 TR (Chiller) • Busbars , • (Voltage Dip)

630A (VCB)

SURGE ARRESTER ,

BUSBARS

: (Exhaust Air Duct) , , VCB,

630A (VCB)

630A (VCB) 1.

2. SURGE ARRESTERS

3.

630A (VCB)

630A (VCB)

630A (VCB) : 630A (VCB)

:

:

WATER BARRIER

:

WATER SHIELD

:

WATER LEAKAGE DETECTION SYSTEM

:

:

:

• (Large Voltage Dip) •

•

• 20

• G/F ( ) & 20/F ( )

• BUSBAR TRUNKING SYSTEM

• 52

:

53

:

N – B – Y – R (OLD CABLE COLOUR CODE)

54

:

1. DUCTOR TEST?

2. DC CURRENT INJECTION TEST?

3. AC CURRENT INJECTION TEST?

55

:

56

1.Ductor Test?

:

57

2. DC Current Injection Test?

:

58

3 AC Current Injection Test?

588

:

?

?

?

Z R X 59

:

R

(ELECTROMAGNETIC INTERFERENCE)

60

1.

2.

(TRANSPOSING METHOD)

61

:

MA

IN S

WB

D

HVAC SWBD

TO HVAC LOAD

R Y B N

Y B R N

B R Y N

High Zone

Mid Zone

Low Zone

R

Y

B

N

G/F 62

:

( )

63

:

• 1250A

64

Location of MeasurementR-N Y-N B-N

Measured at G/F Main Switch Room 217V 219V 219VMeasured at HVAC Switch Room 211V 219V 219V

Phase Voltage (Vp)

:

65

:

67

1200A ACB

1600A ACB Incomer

(BMS SYSTEM)

:

68

:

69

1200A ACB Built-in O/L

IDMT - E/F Protective Relay

:

70

• Built-in O/L

• IDMT E/F Protective Relay

• IDMT O/C Protective Relay

:

71

UNDERVOLT SENSING SIGNAL FROM S.W. BD ‘LVSB-A-04’

:

72

UNDERVOLT SENSING SIGNAL FROM S.W. BD ‘LVSB-A-04’

:

73

:

74

:

75

:

76

:

77

78

79

80

/

?

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2015 Edition

86