Basic Info.
Model NO.
MK-CVT2046
Operation Condition
Outdoor
Usage
Protection, Measurement
Winding Form
Multilayer Honeycomb Type
Insulating Medium
Insulating Gas
Installation
Active Type
Magnetic Circuit Structure
Combined Type
Voltage Transformation Principle
Photoelectric Type
Transport Package
Wooden Case
Specification
Customized
Trademark
Markevina or OEM
Origin
China
Production Capacity
1000000/Year
Packaging & Delivery
Package Size
100.00cm * 150.00cm * 100.00cm
Package Gross Weight
500.000kg
Product Description
Capacitor Current Transformer, 11KV 22KV 33KV 66KV 110KV 220KV 330KV 400KV 770KV
Current Transformer,
Instrument Transformer for High Voltage Power Supply System
Current Transformer,
Instrument Transformer for High Voltage Power Supply System
| Item A | 765 kV Capacitor Voltage Transformer (CVT) | Unit | SCHEDULE A | SCHEDULE B |
| Eskom | Technical | |||
| requirements | guarantees for | |||
| equipment offered | ||||
| 1 | Manufacturer | TYD765/√3-0.0044H | ||
| 2 | Manufacturer's type number | |||
| 3 | Rated Capacitance | pF | 4,400 | 4,400 |
| a) Value of upper capacitance (C1) | pF | |||
| b) Lower Capacitance (C2) | pF | |||
| 4 | System conditions for which the | |||
| capacitor shall be suitable | ||||
| a) Rated frequency | Hz | 50 | 50 | |
| b) System neutral | Effectively earthed | Effectively earthed | ||
| c) Rated r.m.s. line-to-line voltage | kV | 765 | 765 | |
| d) Maximum continuous r.m.s. line-to-line Voltage | kV | 800 | 800 | |
| 5 | Insulation | |||
| a) Minimum crest value of full wave | ||||
| lightning impulse type test withstand | ||||
| voltage to earth at sea level on HV terminal | kV | 2,100 | 2,100 | |
| b) Characteristic of impulse wave | μs | 1.2/50 | 1.2/50 | |
| c) Minimum crest value of full wave | ||||
| switching impulse type test withstand | ||||
| voltage to earth at sea level on HV terminal | kV | 1,550 | 1,550 | |
| d) Characteristic of impulse wave | μs | 250/2 500 | 250/2 500 | |
| e) Minimum 60 s power frequency wet | ||||
| withstand type test voltage to earth at | ||||
| sea level on HV terminal | kV r.m.s. | 975 | 975 | |
| f) Minimum 60 s power frequency dry | ||||
| withstand routine test voltage at sea level | ||||
| on HV terminal | kV r.m.s. | 975 | 975 | |
| g) Partial discharge type test in accordance with | ||||
| IEC 61869-1 | Complies | Complies | ||
| h) Polution level | ||||
| 1) Extra heavy - creepage distances | mm | Extra heavy | Extra heavy | |
| arcing distances | mm | |||
| 6 | Equipment suitable for carrier injection | Yes | Yes | |
| 7 | High frequency capacitance and | % | -20 to +50 of rated C | -20 to +50 of rated C |
| equivalent series resistance | Ωmax | 40 | 40 | |
| 8 | Stray capacitance and stray conductance | pF max | 200 | 200 |
| of low voltage terminals | μs max | 20 | 20 | |
| 9 | Radio influence | |||
| a) Test voltage kV | kV | 508 | 508 | |
| b) Maximum radio influence voltage | μV | 2500 | 2500 | |
| 10 | Self resonant frequency of complete capacitor stack | MHz | >1 | >1 |
| 11 | LV terminals | |||
| Minimum 60 s power frequency dry | ||||
| withstand routine test voltage on low | ||||
| voltage terminal | kV r.m.s. | 10 | 10 | |
| 12 | Capacitor suitable for supporting a line trap | No | No | |
| 13 | VT Secondary windings | |||
| a) Protection (P1) | 1 | 1 | ||
| b) Protection (P2) | 1 | 1 | ||
| c) Metering (M) | 1 | 1 | ||
| d) Total | 3 | 3 | ||
| 14 | VT mounted in base of CC (Single unit) | Yes | Yes | |
| 15 | Rated CVT transformation ratios | |||
| a) Protection winding (P1) | 765/√3 kV to 110/√3 V | 765/√3 kV to 110/√3 V | ||
| b) Protection winding (P2) | 765/√3 kV to 110/√3 V | 765/√3 kV to 110/√3 V | ||
| c) Metering winding | 765/√3 kV to 110/√3 V | 765/√3 kV to 110/√3 V | ||
| 16 | 16 Rated burden of secondary windings | |||
| a) P1 winding | VA | 50 | 50 | |
| b) P2 winding | VA | 50 | 50 | |
| c) M winding | VA | 50 | 50 | |
| d) Total burden | VA | 150 | 150 | |
| 17 | Accuracy class of CVT | |||
| a) P1 winding | 3P | 3P | ||
| b) P2 winding | 3P | 3P | ||
| c) M winding (within burden range 40 VA to 50 VA) | 0.2M | 0.2M | ||
| 18 | Transient response Class | T1 | T1 | |
| 19 | Ferroresonance (Ref 5.15 of 240-56030645) | |||
| a) Amplitude | xxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxx | ||
| b) Damping | xxxxxxxxxxxxxxxxxxx | xxxxxxxxxxxxxxxxxxx | ||
| 20 | Secondary short circuit current | A | ||
| a) P1 winding | ||||
| b) P2 winding | ||||
| c) M winding | ||||
| 21 | Maximum CVT rating as a power transformer | kVA | ||
| Cos φ | ||||
| 22 | Recommended maximum rating of fuses | |||
| protecting the voltage transformer secondary windings | A | |||
| 23 | Class of insulation of VT | |||
| 24 | Rated voltage factor | |||
| a) Continuous | 1.2 | 1.2 | ||
| b) 30 | s | 1.5 | 1.5 | |
| 25 | Temperature category of CVT | °C | -10 to +40 | -10 to +40 |
| 26 | Maximum carrier frequency insertion loss of VT | dB | 0.5 | 0.5 |
| 27 | Minimum 60 s power frequency withstand routine | |||
| test voltage on secondary windings | kV r.m.s. | 2 | 2 | |
| 28 | CVT equipment with carrier earthing switch | Yes | Yes | |
| 29 | Carrier drain coil | |||
| a) i) Maximum insertion loss | dB | 0.5 | 0.5 | |
| or | ||||
| ii) Minimum impedance at carrier frequency | kΩ | 10 | 10 | |
| b) i) Maximum volt drop at rated frequency with | ||||
| associated CC energized at rated voltage | V | 30 | 30 | |
| or | ||||
| ii) Maximum 50 Hz impedance | Ω | 20 | 20 | |
| c) Minimum 50 Hz current carrying capacity | ||||
| i) Continuous | A r.m.s. | 1 | 1 | |
| ii) Short time for 0.2s | A r.m.s. | 50 | 50 | |
| d) Minimum impulse withstand voltage | kV | 10 | 10 | |
| 30 | Low voltage terminal arrester | |||
| Non linear arrester | Yes | Yes | ||
| a) Rated voltage | kV | |||
| b) Impulse sparkover voltage | kV | |||
| c) Minimum 8/20 μs impulse discharge current | kA | 5 | 5 | |
| 31 | Type of mounting | Upright on pedestal with | Upright on pedestal with | |
| integral VT as base unit | integral VT as base unit | |||
| 32 | High-voltage terminal | |||
| a) Terminal material and finish | ||||
| b) Dimensions | mm | 60 dia x 150 long | 60 dia x 150 long | |
| c) Arrangement of terminals | Vertical | Vertical | ||
| d) Number of terminals | 1 | 1 | ||
| e) Withstand force without failure | kN | 3 | 3 | |
| f) Withstand force without distortion | kN | 1.5 | 1.5 | |
| 33 | Secondary terminals | |||
| a) Separate terminal box for secondary terminals | ||||
| with gland plate facilities | Yes | Yes | ||
| b) Separate insulated bushing for connection to | ||||
| carrier equipment | Yes | Yes | ||
| 34 | Mass of complete CVT | kg | ||
| 35 | Outline Drawings showing: | |||
| a) dimensions, fixing details and mounting arrangements | Yes | Yes | ||
| b) Details of HV connecting terminals | Yes | Yes | ||
| c) Earth terminal | Yes | Yes | ||
| d) Details of secondary terminal | Yes | Yes | ||
| e) Details of earth switch and carrier connection | Yes | Yes | ||
| f) Nameplate | Yes | Yes | ||
| 36 | Type test reports (Capacitor Voltage Transformer) | |||
| a) Temperature-rise test | Yes | Yes | ||
| b) Chopped impulse test | Yes | Yes | ||
| c) Switching impulse test | Yes | Yes | ||
| d) Wet test for outdoor type transformers | Yes | Yes | ||
| e) Radio influence voltage test (RIV) | Yes | Yes | ||
| f) Transmitted overvoltage test | Yes | Yes | ||
| g) Test for accuracy | Yes | Yes | ||
| h) Verification of the degree of protection by enclosures | Yes | Yes | ||
| i) Enclosure tightness test at ambient temperature | Yes | Yes | ||
| j) Capacitance and tan δ measurement at power frequency | Yes | Yes | ||
| k) Short circuit withstand capability test | Yes | Yes | ||
| l) Ferro-resonance test | Yes | Yes | ||
| m) Transient response test | Yes | Yes | ||
| n) Mechanical test | Yes | Yes | ||
| 37 | Type test reports (Carrier frequency accessories) | |||
| a) Drain coil - Impulse voltage test | Yes | Yes | ||
| b) Drain coil - Voltage withstand test | Yes | Yes | ||
| c) Voltage limitation device - Impulse voltage test | Yes | Yes |
