350kv 8000kva series resonant cable test system
TRANSCRIPT
Technical Specification:XZL-8000KVA/350KV AC Resonant Test System Customer: Elsewedy Cables-Egypt Page 1total 24
AC Voltage Withstand & Partial Discharge
Complete Test Equipment For
220kV & Lower Rubber Plastic Cable & XLPE Cable
Routine Test
Technical Specification
(XZL-8000/350)
Y a n g z h o u P o w e r E l e c t r i c C o . , L t d .
Design Specification
This set of AC inductance tunable cascade resonant test equipment is mainly for testing and
inspecting cables and capacitors of 220kV and lower voltage, ensuring the 220kV large cross
section cables with reel(cross section area ≥2500mm2, length of the whole reel≥600m) meet
the voltage withstand and partial discharge test requirements of IEC60840-1997 and national
standard GZ/T 18890-2002.
Steel shell (I) cable partial discharge testing system (350kV 7000kVA 20A) sold
to India for cables of 220kV and lower voltage. It have been running
successfully.
Technical Specification:XZL-8000KVA/350KV AC Resonant Test System Customer: Elsewedy Cables-Egypt Page 1total 24
PQ test system provided for Wuhan High Voltage Research Institute for testing cables of 220kV and
lower voltage. It was the first one of the same kind in China.
Short sample partial discharge testing system (1200kV 7200kVA) provided for China National Cable and
Wire Quality Supervision and Inspection Center (Shanghai Electric Cable Research Institute) in 2010 for
testing cables of 500kV and lower voltage. It is now running in the SECRI MV lab.
PQ test system (700kV 14000kVA) provided for China National Cable and Wire Quality Supervision and
Inspection Center (Shanghai Electric Cable Research Institute, SECRI) in 2010 for testing cables of 500kV
and lower voltage. It is now running in the SECRI outdoor PQ center. It is cable of running continuously.
Siait Cable Co.,
Ltd. 120kV/1200kVA-40kV/800kVA
TBEA(Sichuan Province)120kV/50kV/1200kVA
Showing in the above two photos are PD testing system for cables of 35kV and lower voltage provided
for Siait Cable Co., Ltd. and Tebian Electric Apparatus Co., Ltd. (TEBA) in 2011. We have provided quite a
few similar cable PD testing system to some famous companies in China such as Siait Cable Co., Ltd.,
TEBA, Hebei New Baofeng Wire & Cable Co.,Ltd, Jiangsu shangshang Cable Group etc.
220kV and lower voltage cable partial discharge testing system (insulated cylinder shell type, 350kV,
12250kVA, 35A) provided for Jiangsu Zhongtian Technology Co.,Ltd. in 2010. It finished the history of
this kind of cable partial discharge test equipment relying on importing form other countries.
1000kV and lower voltage cable partial
discharge testing system (1400kV, 49000kVA,
35A) provided for Hebei New Baofeng Wire &
Cable Co., Ltd in 2011. The picture shows
SECRI doing type test to their equipment
with our two-stage cascade equipment in our
lab. This set of equipment is a landmark in
the cable testing industry in China.
Technical Specification:XZL-8000KVA/350KV AC Resonant Test System Customer: Elsewedy Cables-Egypt Page 1total 24
We have just been awarded the bid of 500kV (1000kV) and lower HV cable
accessories partial discharge testing equipment of ANKURA.
AC Voltage Withstand & Partial Discharge Complete Test
Equipment
For 220kV & Lower Rubber Plastic Cable & XLPE Cable
Routine Test
Technical Specification
I. Application Scope
This set of AC inductance tunable cascade resonant test equipment is mainly
for testing and inspecting cables and capacitors of 220kV and lower voltage,
ensuring the 220kV large cross section cables with reel(cross section area
≥2500mm2, length of the whole reel≥600m) meet the voltage withstand and
partial discharge test requirements of IEC60840-1997 and national standard
GZ/T 18890-2002.
II. General Service Condition
Altitude: <1000 米
Ambient temperature:-10℃~+45℃
Relative humidity:<90%(at 25℃)
Max. daily temperature difference:25℃
Atmospheric pressure:0.1MPa
Atmospheric humidity:11g/m3
Earthquake intensity:≤7 级
Service environment:Indoors
No conducting dust
No fire or explosion hazard
No metal corrosive gas or insulating gas in the lab
Waveform of the supply voltage is actual sine wave, waveform deviation factor <3%
Earth resistance <0.5 with a reliable grounding point
Site background PD level<3pC
III. Standards
GB10229 Reactor
JB/T9641 Test transformer
GB1094 Power Transformer
GB/T 16927.1 High Voltage Test Technology; First Part Common Test Requirements
GB/T 16927.2 High Voltage Test Technology; Second Part Measurement System
GB7328 Transformer and Reactor Sound level Measurement
GB7354 Partial Discharge Measurement
GB8749 General Technical Requirement for Voltage Regulator
JB/T563 Coupling Capacitors and Capacitor Dividers Ordering Technology
GB/T.311 Insulation Co-ordination of High voltage Transmission and
transformation equipment
GB2536 Transformer Oil
GB 2900 Electrical Terminology
GB4208 Degrees of Protection Provided by Enclosure
IEC 60840
Power cables with extruded insulation and their accessories for rated
voltages above 30 kV (U<(Index)m> = 36 kV) up to 150 kV (U<(Index)m>
= 170 kV) - Test methods and requirements
IEC 62067
Power cables with extruded insulation and their accessories for rated
voltages above 150 kV (Um = 170 kV) up to 500 kV (Um = 550 kV) - Test
methods and requirements
IV. Wiring Diagram of the Main Test Loop
LV Switchgear GGD-0.38
LV Filter LBL-800A/0.6kV
Resonant Reactor XZL-8000kVA/350kV
Exciter Transformer ZB-300kVA/5kV/10kV/20kV
HV Filter LBH-350kV/30A
HV Column Type Regulator TYDZ-300/0.38/0-0.65
AC-2008 Automatic Control System
Safety Discharge Rod
V. Main Technical Parameters
5.1 Integral Performance Parameters
Rated input voltage:0.38kV
Nominal Power:Tap I:8000kVA
Tap II:8000kVA
Tap III:2625kVA
Rated input power:300kVA
Rated input current:789.5A
Rated output voltage:Tap:350kV
Tap II:200kV
Tap III:100kV
Rated output current:Tap I:22.8A
Tap II:40A
Tap III:40A
Phase:single
Service Frequency:50Hz
Total Harmonics Distortion:<3%
Cable inductance tunable range and capacitor loading range:
Tap Ⅰ:48.0H~977H 0.01~0.21μf
Tap Ⅱ:15.9H~318H 0.0318~0.637μf
Tap Ⅲ:7.96H~159H 0.0636~1.27μf
Inductance range deviation:0~+10%
System PD level:<2pC at 350 kV
Temperature rise requirements: running for one hour with full load and cooling for
one hour, six cycles and temperature rise ≤65k
Voltage withstand requirement:35kV for one hour
Noise level ≤75dB (within the range of 4 m);
Quality factor:< 60;
5.2 LV Switchgear Cabinet
LV switchgear cabinet is mainly for switch on and off the main power supply of the test
loop; it also has the function of over-current and over-voltage protection, ensuring the
test can be conducted safely. Technical parameters are:
Model:GGD-0.38
Raged frequency:50Hz
Rated voltage:0.38kV
Rated current:1200A
Installation:Indoors
Operation voltage:AC220V
Protected by AC contactor and isolating switch.
Main features:easy to install, close operation and remote operation, with the
functions of 安 isolating and switching, over-current and over-voltage protection,
instantaneous trip protection, measuring indication etc.
5.2 Column Type Voltage Regulator
Voltage regulator provides exciter transformer with adjustable AC input voltage from zero
to rated value. It has the advantages of outputting voltage with small total harmonics
distortion, low power consumption, high efficiency and
small spark. It also has the functions of motorized
regulating, zero voltage output, upper limit and lower limit.
Model:TYDZ-300/0.38/0-0.65
Rated capacity:300kVA
Rated input voltage:0.38 kV
Rated input current:789.47A
Rated output voltage:0~0.65kV
Rated output current:461.5A
phase:single phase
rated service frequency:50Hz
Total harmonics distortion:<3%
Regulating type:motorized regulating
Structure feature:column type
Running time:the same as reactor
Short circuit performance:Under the transient state capacity state, when test object in
the test loop discharges and lasts no more than 5 wave period, no thermal damage or
mechanical deformation should happen to the regulator winding group.
5.4 LV Filter
LV filter is between the regulator and exciter transformer and it is mainly for suppressing
the interference of the clutter from power supply within the bandwidth of PD
measurement, improving the sensibility of PD test and reducing the background noise.
It is designed to use passive network, including cascade inductor and parallel capacitor,
“JT” structure, low-pass property, low passband loss, big high-frequency attenuation. Lv
filter to be installed in the regulator cabinet and following are the technical parameters:
Model:LBL-800A/0.6kV
Rated voltage:600V
Rated current:800A
Filter reactor quality factor:>70
Attenuation characteristics:40KHz~100KHz>40dB
100KHz~1MHz>60dB
Insulation level:5kV/1min no abnormal discharge
Running time: the same as resonant reactor
Cooling: natural air cooling
5.5 Exciter Transformer
Exciter transformer provides exciting voltage to HV resonant reactor, isolating the testing
loop and voltage adjusting loop. Its secondary side and HV reactor compose a cascade
resonant loop.
There is instrument coil inside the transformer and the exciting voltage value can be read
through the meters on the control console, and HV current signal can be sent to the
control system through current transformer that installed in the HV earthing loop.
Model:ZB-300
Rated capacity:300kVA
Rated input voltage:0.6kV
Rated output voltage:12kV、7.5kV 5kV
Rated output current:25A、40A、40A
HV switchgear: with 12kV/7.5kV/5kV
motorized discharge free change-over
switchgear;
Measuring voltage: 100V
Phase: single
Rated service frequency:50Hz
Total harmonics distortion:<3%
Temperature rise:65K
Cooling type:ONAN
Insulation level:withstanding for 1 minute at 1.1 times of rated voltage
Running time:the same as reactor
5.6 HV reactor
XZL-8000/350/200/100 reactors as
the critical part in the system form
series resonant circuit together with
load capacitance. When the induced
reactance of reactors matches the
capacitive reactance of cables, the
system gets into resonant condition.
The reactor is equipped with
self-coupling tap which could make the output voltage reach up to 350KV in no-load
condition.
Parameters for single reactor:
Model: XZL-8000/350/200/100
Structure: metal tank, oil-immersed, natural cooling, output through capacitive HV
bushing which is led until within the shielding room.
Rated capacity: tap I: 8000kVA
tap II: 8000kVA
tap III: 4000kVA
Rated output voltage: tap I: 350kV
tap II: 200 kV
tap III: 100kV
Rated output current: tap I: 22.8A
tap II: 40A
tap II: 40A
Phase: single
Rated working frequency: 50Hz
Waveform distortion rate: <3%
Temperature rise: under full load, ON Ih OFF 1h as one duty cycle, capable of 6
cycles; temperature rise≤65K
Quality factor: >45
Noise level: <75dB
Inductance regulation: motor-driven, stepless regulation
Cooling approach: ONAN
PD of the reactors: at 280 kV <5pC, at 350 kV <10pC,
PD with HV impedance system: at 350 kV <2pC,
Voltage withstanding: at 350kV running for 1h
Running time: under rated capacity, ON Ih OFF 1h as one duty cycle, capable of 6
cycles
HV switches: motor-driven, no discharge, HV change-over switch, could output
voltage of 350kV/200kV/100kV
Design description:
The reactor main part is fixed in frame. Cushion is used at the contact to oil tank. fixed
inductance is regulated through motor which is installed on the lid.
Shielding on top of porcelain bushing is round.
Inner structure:
5.7HV Filter(including capacitive voltage divider, coupling capacitor and
isolation impedance)
Model: LBH-350
Rated voltage: 350kV
Rated frequency: 50Hz
Rated capacitance: 6nF +6nF
Measuring precision: ≤1%
Dielectric loss: ≤0.4%
Attenuation:15kHz~300kHz≥40dB
Insulation level: 1.1 times of rated voltage
withstand for 1min
Chassis: stable enough, could keep balance on
uneven floor, easy to assemble and disassemble, with wheels for movement
Capacitive voltage divider could be also used as coupling capacitor during PD
measurement.
Running time: as reactor
Principle:
Commonly very small PD is required during tests. Then a HV audio frequency interference filter
is needed between the HV reactor and the test object to ensure small PD level measurement.
The HV filter is composed of L-C-L-C combination. L stands for isolation impedance, forming π
type filter together with the capacitance C. There is measuring capacitance at bottom of the first
capacitor which functions as well to measure output voltage of the voltage divider and the
resonant system. The second capacitor is actually a coupling capacitor, connected with PD
detector through inspecting impedance, thus to allow PD signals measurement in the meantime.
Additionally, the two capacitors function as basic load of the system, which is good for small
load and sample tests.
HV Capacitors
Model:TAWF-6000/350
Quantity:1
Rated voltage: 350 kV
Rated capacitance: 6nF
Rated power: 50 Hz
Dividing ratio: 10000:1
PD: at rated voltage <2pc,
Structure: oil-immersed, moveable, composed of top shielding, main part, chassis, LV arm,
etc.
Model: ORF-6000/350
Quantity: 1
Rated voltage: 350 kV
Rated capacitance: 6nF
Rated frequency: 50 Hz
HV capacitors act basic load. The total capacitance of the two capacitors make the system
run normally on no-load condition. That is to say, basic load capacitance is no less than
minimum value of the HV reactor load range.
Isolation impedance
Model: LS 350-60/30
Quantity: 2
Rated current: 30A
Running time: continuous running
Rated inductance: approx. 60Mh
5.8 XZL-2008 Series Resonant Test
Control System
Control system is center of the complete PD
test system, located inside the control room. All
control operations are accomplished through the
control system. All switches, lamps, contactors
and circuit boards are selected from products
made by manufactures of the first class home or
abroad.
General description
The control system for series resonant test device is modified on basis of that of traditional transformer
voltage withstand test device. The control system makes advantages of modern computer for the intelligent
automatic voltage control of series resonant system. Console with fully functional and simple user interface,
all control components are clear at a glance. You can easily use the control system for all kinds of voltage
withstand tests you need, such as sample acceptance voltage withstand test, step by step voltage
withstand test. When you use this resonance test system, you will find the past cumbersome test
operations are replaced with a few simple mouse clicks.
Functions
Hardware Functions
The resonant control system is designed from the standpoint of safety of using. In addition to
various voltage withstand test functions, it also has a variety of protective features, including
operation security of equipment, test operator safety protection etc. Control system has the
breakdown flashover protection function which minimizes the extent of damage from the
breakdown of the sample, to provide samples of prototype as complete as possible for the
analysis of the failed sample.
One of the main functions of Junction Box is the ON/OFF of the voltage regulator, voltage
regulation and state detection, etc., the other main function is to drive reactor core gap to
regulate motor and high-voltage side state detection. Junction boxes are equipped with
equipment provided by ABB and Mitsubishi products to ensure the reliability of the test control
system, rapidity and accuracy.
Main function of protection interface module is to restrain and absorb the transient over-voltage
from junction box of series resonant test system, to ensure the safe operation of the console
and operator safety.
The control device measures all the parameters of the resonant test system and also all the
movements of the control system. As measuring equipment, the control device is consisted of
the equipment modules from world-renowned manufacturers to ensure the long-term stability of
equipment operation. Data acquisition unit uses AD conversion of 14-bit precision to ensure the
accuracy of test voltage. Flashover detection unit shows signal in the test sample flashover
moments, direct action triggers circuit breakers to protect the integrity of test samples. At the
same time, flashover detection unit can detect the flashover transient voltage waveform polarity
and amplitude of test samples.
Software functions
The system adopts Windows 2000 operating system which ensures long-term stability of the
control system operations.
The program has friendly human-computer interface which allows users to control the test
system intuitively. User can do some simple voltage withstand test manually or automatically,
and can also set the timer to do the voltage withstand test at a certain time. In some areas of the
interface, they shows different colors according to different working status of the resonant test
system which has great help on reminding operations for user. The software has over-voltage,
over-current protection function, when the test voltage exceeds the protective setting value by
user’s mistakes or power supply fault, the system will decrease the voltage automatically or
directly break the power supply to protect the safety of test samples.
The main test parameters shows on the programming interface: system output voltage,
resonance status, system output current, output voltage of exciter transformer, working status of
voltage regulator, test waveform curve and all kinds of main working status.
The software “flow control” has the function of sequential operation which brings convenience
for users. User can set series of voltage values, voltage withstand time, change speed of
voltage, and then the “flow control” will perform the sequence of operation automatically. User
can also set the test starting voltage, step voltage, change speed of voltage and voltage
withstand time to do the step by step voltage withstand test.
Test waveform curve window displays the voltage change process of the test sample, by which
user can do analysis on the test intuitively. The test report can be generated automatically by
the control system according to waveform curve which improves user’s working efficiency. All
the test data will automatically keep the record in the hardware of the computer, user can check
the record at any time.
The control system will update and keep the alternating voltage and current waveform of the
test, it lasts for 20s. When the test sample flashover occurs, the control system will stop
updating and keep all kinds of original data 20s before flashover. User can check the change of
alternating voltage and current 20s before flashover which provides direct waveform parameter
for the further research.
Technical specifications
Console measurement accuracy
Name Sampling precision Note
System output voltage 14 bit
System output current 14 bit
Exciter transformer output voltage 14 bit
Voltage regulator output voltage 14 bit
Voltage regulator Output Current 14 bit
Flashover protection time
System operating time ≤ 10ms
a, Console input power
Name Specification Note
Voltage 230V ± 10%
Capacity 400VA
Frequency 50/60Hz
Protective tube 5A
b, Console inside supply
Name Specification Note
+24V 5A
+15V 1.5A
-15V 1.5A
+5V 3A
c, Console input and output switch
Name Specification Note
input 24A DC
output 24A DC
d, Console input and output analog
Name Specification Note
input 0~7V AC
input 0~10V DC
output 0~10V DC
Matching Peak Voltmeter
Peak voltmeter is used in AC voltage withstanding test to measure the testing voltage and RMS.
Requirements for the peak voltmeter:
Input voltage measuring range: 500V, for peak voltage / 2 or RMS
This is the actual input voltage for the meter. Input voltage=testing voltage/dividing ratio
Peak reappearance B: peak/RMS
Displays:
Voltage display: takes 4 and half bit digital meter, directly display RMS or peak/ 2 of the
testing voltage. Reading is in KV.
Dividing ratio can be set with DIP switch: the switch contains 4 digits, thus the dividing ratio
could be up to 9999. Before tests, set this switch to select suitable dividing ratio to get more
precise measurement.
Precision not less than Grade 0.5.
Hold of the over voltage at the discharge instant.
5.9 Safety Discharge Rod
During voltage withstanding test, if the cable is breakdown, or when testing on one stand of a
triplex cable with the rest two phases suspended, there may be residual or induced charge on
cable. To ensure safety of personnel, the system is equipped with a safety discharge rod. With
this rod discharges the cable completely when test is over, thus possible hazard will be
removed.