One-ended substations with dead-earthed neutral and PKTPVR type transformers

Complete one-ended transformer substations with dead-earthed neutral of transformer

Function, field of application
Designed to receive, convert and distribute electric power of three-phase alternating current with the frequency 50 Hz and voltage (10-0.4 kV) in systems with dead-earthed neutral of transformer at the low-voltage side. They are applied in power supply of oil and gas industry, building areas, industrial and municipal facilities and in electric power distribution systems.

Construction of PKTPVR.
Constructively substation is made in the form of kiosk type module and has built-up and welded construction. Framework is load-bearing and bears hardest dynamic impacts. Substation consists of following structural components (according to GOST 14695-80 and TU 34.11.10873-93):

1) HV switchgear cabinet;

2) LV switchgear cabinet;

3) High-voltage bushing;

4) Transformers chamber.

Transformers chamber has swinging gates on two sides, by means of those gates access into chamber is performed and installation and deinstallation of equipment including power transformer is possible.

LV switchgear has swinging gates by means of those gates access to bushing and feeder switching equipment and monitoring devices is performed.

LV switchgear can be manufactured in different executions depending on combination of bushing/feeder units (A/A, R/A, R/R). Box with bank of capacitors can bi installed in LV switchgear cabinet (depending on a customers request).

All gates are equipped with locks fixing gates in closed position, locks of HV switchgears cell have tricks, different from locks of LV switchgears cell.

Transformer chambers gates have window for examination of power transformer. High-voltage bushing is an enclosed current-conducting wire with metal sheath and has inside-fixed busbar.

High voltage bushing is performed by post or feedthrough insulators.

Excess-voltage suppressors or aerial fuses are installed on high-voltage bushing. PKTPVR can be executed with installation of high-voltage disconnector inside HV switchgear cabinet or on the high-voltage bushing. To connect power transmission line of 6 (10) kV, depending on a customers request, disconnector that can be installed on the nearest transmission tower goes as a set.

Mounting and inspection of high voltage bushing is performed through detachable cap.

Strapping of substation is performed by means of frames welded on the top of the body.

Electric schematic diagram of one-ended substation with dead-earthed neutral PKTPVR type, 25-400 kVA, A/A

Positional notation

Item

Quantity

QS1

Disconnector 10kV

1

FV1-FV3

Aerial fuse 10(6)kV

3

FU1-FU3

Safety fuse PKT 10(6)kV

3

1

Power transformer

1

1-3

Current transformer

3

A

Amperemeter

1

V

Voltmeter

1

Wh

Active-energy meter

1

QF1

Incoming switch

1

QF2-QFn

Feeder switch

3-10

SF

Automatic switch 10A

1

SA

Circuit changer 380V 10

1

FU4-FU6

Safety fuse PPT-10

3

XS

Power connector

1

Engineering data

Item

Value

Rated power of power transformer, kVA

25; 40; 63; 100

Rated voltage at the HV side, kV

6; 10

Rated voltage at the LV side, kV

0,4

Execution of HV bushing

Aerial

Execution of LV terminal

Cable

Offset disconnector (for aerial bushing)

RLND diconnector

combination of bushing/feeder units at the LV side

/

Substation type

B, mm

L, mm

L1, mm

H, mm

Weight, kg

PKTPVR-25

1500

1800

2480

2200

1500

PKTPVR -40

1560

PKTPVR -63

1670

PKTPVR -100

1800

PKTPVR -100

1580

2190

2865

2490

2300

PKTPVR -160

2500

PKTPVR -250

2860

PKTPVR -400

3100

PKTPVR -630

2245

22445

2855

2675

4080

Electric schematic diagram of one-ended substation with dead-earthed neutral PKTPVR type, 100-400 kVA, R/R

Positional notation

Item

Quantity

QS1

Disconnecting switch 10kV

1

FV1-FV3

Aerial fuse 10(6)kV

3

FU1-FU3

Safety fuse PKT 10(6)kV

3

1

Power transformer

1

1-3

Current transformer

3

A

Amperemeter

1

V

Voltmeter

1

Wh

Active-energy meter

1

QF1

Incoming switch

1

QF2-QFn

Feeder switch

3-4

SF

Automatic switch. 10A

1

SA

Circuit changer 380V 10

1

FU4-FU6

Safety fuse PPT-10

3

XS

Power connector

1

Engineering data

Item

Value

Rated power of power transformer, kVA

100; 160; 250; 400

Rated voltage at the HV side, kV

6; 10

Rated voltage at the LV side, kV

0,4

Execution of HV bushing

Aerial

Execution of LV terminal

Cable

Offset disconnector type (for aerial bushing)

RLND disconnector

combination of bushing/feeder units at the LV side

/; R/; R/R

Electric schematic diagram of one-ended substation with dead-earthed neutral PKTPVR type, 630 kVA, A/A

Positional notation

Item

Quantity

QS1

Disconnector 10kV

1

FV1-FV3

Aerial fuse 10(6)kV

3

QW1

Gas-blast load-break switch

1

FU1-FU3

Safety fuse PKE 10 (6) kV

3

1

Power transformer

1

1-3

Current transformer

3

A

Amperemeter

1

V

Voltmeter

1

Wh

Active-energy meter

1

QF1

Incoming switch

1

QF2-QFn

Feeder switch

Up to 16

SF

Automatic switch. 10A

1

SA

Circuit changer 380V 10

1

FU4-FU6

Safety fuse PPT-10

3

XS

Power connector

1

Electric schematic diagram of one-ended substation with dead-earthed neutral PKTPVR type, 630 kVA, R/R

Positional notation

Item

Quantity

QS1

Disconnector 10kV

1

FV1-FV3

Aerial fuse 10(6)kV

3

QW1

Gas-blast load-break switch

1

FU1-FU3

Safety fuse PKE 10 (6) kV

3

1

Power transformer

1

1-3

Current transformer

3

A

Amperemeter

1

V

Voltmeter

1

Wh

Active-energy meter

1

Q1

Incoming switch

1

Q2-Qn

Feeder switch

Up to 5

SF

Automatic switch. 10A

1

SA

Circuit changer 380V 10

1

FU4-FU6

Safety fuse PPT-10

3

Electric schematic diagram of one-ended substation with dead-earthed neutral PKTPVR type,1000 kVA, A/A

Positional notation

Item

Quantity

QS1

Disconnector 10kV

1

FV1-FV3

Aerial fuse 10(6)kV

3

QW1

Gas-blast load- break switch

1

FU1-FU3

Safety fuse PKE 10 (6) kV

3

1

Power transformer

1

1-3

Current transformer

3

A

Amperemeter

1

V

Voltmeter

1

Wh

Active-energy meter

1

QF1

Incoming switch

1

QF2-QFn

Feeder switch

Up to 16

SF

Automatic switch. 10A

1

SA

Circuit changer 380V 10

1

FU4-FU6

Safety fuse PPT-10

3

XS

Power connector

1

Electric schematic diagram of one-ended substation with dead-earthed neutral PKTPVR type, 1000 kVA, R/R

Positional notation

Item

Quantity

QS1

Disconnector 10kV

1

FV1-FV3

Aerial fuse 10(6)kV

3

QW1

Gas-blast load-break switch

1

FU1-FU3

Safety fuse PKE 10 (6) kV

3

1

Power transformer

1

1-3

Current transformer

3

A

Amperemeter

1

V

Voltmeter

1

Wh

Active-energy meter

1

Q1

Incoming disconnecting knife-switch

1

Q2-Qn

Disconnecting knife-switch with protective devices

Up to 5

SF

Automatic switch. 10A

1

SA

Circuit changer 380V 10

1

FU4-FU6

Safety fuse PPT-10

3

Engineering data

Item

Value

Rated power of power transformer, kVA

630; 1000

Rated voltage at the HV side, kV

6; 10

Rated voltage at the LV side, kV

0,4

Execution of HV bushing

Aerial. cable

Execution of LV terminal

Cable

Offset disconnector type (for aerial bushing)

Load-break switch VNP

combination of bushing/feeder units at the LV side

/; R/; R/R

Due to continuous improvement work some changes in construction may be made, but it wont change engineering data of substation.