CT VT Installation Manual

PT. TRAFOINDO PRIMA PERKASA

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CT/VT INSTALLATION MANUAL

1. Checking upon arrival 1.1. Inspection must be made for any sign of damage such as crack, broken inccured during

shipment. 1.2. Check the completeness of test report, bolts. 1.3. In case CT/VT is shipped in wooden packing, start to open from the top and then side

packing. Use appropriate lifting equipment and never opposite to lift. 2. Storage

Place CT/VT in indoor securely, maximum temperature 400 C and avoid with water contact. 3. Installation

3.1. CT Primary terminal 3.1.1. Ensure bar toward P1 and P2 in flat condition 3.1.2. Tightening torque refers to table 1 below:

Table 1 Recommended torque Bolt size Torque (N.m)

M-12 60 M-10 25 M-5 3.5

When tightening, always use appropriate tool. 3.1.3. If hole of primary connection is more than one, the sequence of tightening may

follow figure 1: Figure 1 The sequence of tightening

3.2. CT secondary terminal 3.2.1. Connect secondary terminal CT to appropriate load as shown in the name plate. 3.2.2. Important! Never open circuit the secondary of CT. Fail to do so will cause damage

to CT. 3.3. VT secondary terminal

3.3.1. Connect secondary terminal VT to appropriate load as shown in the name plate. 3.3.2. Important! Never short-circuited the secondary of VT. Fail to do so will cause

damage to VT. 3.4. Checking of Clearance

Recommended clearance refers to table 2 below. Tabel 2 Electrical clearance

Voltage (kV) a (mm) b (mm) 7.2 90 90 12 120 120 24 220 220

If clearance is less than recommended value, additional barrier insulation may insert.

1

2 3 4

a b


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3.5. CT multi ratio with series-parallel connection 3.5.1. At low ratio connection in series (C1- C2 to be connected)

Figure 2 CT Multi ratio in series 3.5.2. High ratio connection in parallel (P1-C1 , P2-C2 to be connected)

Figure 3 CT Multi ratio in parallel

4. Grounding, HV Source Connection and Example of wiring 4.1. Connect base plate to grounding

Make sure the ground resistance shall be as small as possible and not exceed 5 ohm.

4.2. High voltage transformer connection (H1) When connecting VT 1B in 3 phase system, always check the connection of H1 transformer. Follow table 2 below for recommendation of wiring.

P1 C1 P2 C2

1S1 1S2 2S1 2S2

P1 C1 P2 C2

1S1 1S2 2S1 2S2

H1 VT 1B VT 1B

VT primary cubicle VT secondary cubicle

Step down MV Step down HV Distribution transformer Power transformer


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VT1B connection in 3 phase system Primary

connection of H1

transformer

Secondary connection

of H1 transformer

VT1B connection

Primary

VT1B connection secondary

Result of secondary VT

Remark

L-N= balance L-L=balance

Recommended

L-N= unbalance L-L=balance

Not recommended


Not recommended


Not recommended


Not recommended


Not recommended


Recommended


Recommended


Not recommended

L-N= unbalance L-L=unbalance

Not recommended

L-N= unbalance L-L=unbalance

Not recommended


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4.3. Example of wiring 3P4W CTVT with VT 1 Bushing (Ref: JIS C1210C)

4.4. Example of wiring 3P3W CTVT with VT 2 Bushing (Ref: SPLN 57-1:1991)

5. Electrical Inspection prior to energize CT/VT 5.1. Insulation resistance

Table 2 Insulation resistance No. Result (MOhm) Test set 1. P-E = VDC ≥1000/5000 V 2. P-S = VDC ≥1000/5000 V 3. S-E = VDC ≤1000/2500 V 4. 1S1-2S1= VDC ≤1000/2500 V 5. 2S1-3S1= VDC ≤1000/2500 V Note: 1. Recommended value of insulation resistance should be more than 2000 Mohm, if lower

value is found, clean the body and terminal thoroughly using a dry and clean cloth. 2. Insulation resistance test at secondary by ≥5000 V will cause damage to CT/VT.

5.2. Ensure primary connection has been torqued properly. 5.3. Ensure secondary side has been connected to the appropriate load. 5.4. In case of high potential test on site, the reduced value of 80% shall be applied.

A N

A

N

A

N

a n a n n a

0 L1 L2 L3

P1 P2 1S1 1S2

P1 P2 1S1 1S2

P1 P2 1S1 1S2

to metering

A A B

A

B

a b b a

R S T P1 P2

1S1 1S2

P1 P2 1S1 1S2

1 2 3 5 7 8 9

kWh single tariff


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6. Maintenance of CT/VT 6.1. CT and VT are made from resin which is no special maintenance required. 6.2. During annual maintenance, clean CT and VT and check the connection of primary and

secondary in good condition. 7. Contact detail

For further information and queries, please contact Marketing below: PT. Trafoindo Prima Perkasa Jl. Hayam Wuruk 4FX Jakarta 10120 Telp +62-21-3451384, 3850703 Fax +62-21-3850702, 3861869 Email: [email protected] http://www.trafoindonesia.com

CT VT Installation Manual

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