QUALITY column will be most interested and mostly concern by serious new customer!
Following are major explanation for important technical parameters:
Insulation Resistance or IR as the name suggests is the resistance of
the insulation. IR actually protects electrical equipment from short circuit. IR values
are generally very high in the range of Mega-ohm or Mohm.
Temperature Coefficient depends on whether the dielectric is Class 1 or Class 2. A ceramic
capacitor (especially the class 2) often has high dissipation factor, high frequency coefficient of dissipation.
Dissipation factor (tan δ):or DF is defined as the ratio of the ESR and capacitive reactance. It is the
dissipation factor is also known as the tangent of the loss angle and is commonly expressed in percent.
Recognized standards express the dissipation factor at specific frequencies typically 120Hz for Aluminum
electrolytic and Tantalum capacitors while for film capacitors is 1 kHz and 1 MHz for ceramic capacitors.
Partial Discharge (PD): is an electrical discharge or spark that bridges a small portion of the insulation
between two conducting electrodes.PD can occur at any point in the insulation system, where the electric field
strength exceeds the breakdown strength of that portion of the insulating material.PD can occur in voids within
solid insulation, across the surface of insulating material due to contaminants or irregularities, within gas bubbles
in liquid insulation or around an electrode in gas (corona activity).
Dielectric Material:
|
Letter (low temp) |
Digit (high temp) |
Letter (change) |
|
X= −55 °C (−67 °F) |
2= +45 °C (+113 °F) |
E= ±4.7% |
|
Y= −30 °C (−22 °F) |
4= +65 °C (+149 °F) |
F= ±7.5% |
|
Z= +10 °C (+50 °F) |
5= +85 °C (+185 °F) |
P= ±10% |
|
|
6=+105 °C (+221 °F) |
R= ±15% |
|
|
7=+125 °C (+257 °F) |
S= ±22% |
|
|
8=+150 °C (+302 °F) |
T= +22 to −33% |
|
|
|
U= +22 to −56% |
|
|
|
V= +22 to −82% |
For example, a Z5U capacitor will operate from +10 °C to +85 °C with a capacitance change of at most +22% to −56%. An X7R capacitor will operate from −55 °C to +125 °C with a capacitance change of at most ±15%
HVC's N4700 Dielectric Material: similar to other company, electroceramics determine the major feature
of the caps. HVC spend 3 years and millions of $ to invent patented strontium titanate , which is N4700 type.This
N4700 material provide a very good high frequence feature , excellent huge insulation resistance and tiny dissipation
factor and super long life up to 20 years.
Technical Specification Comparison:
To let customers know HVC’s item in deep,we show off HVC's technical specification compare with different existing
brand from Europe and North Amercia.
Amercian Brand E*****
offer only ceramic disc caps, offer same to HVC's dielectric material X5F.
Dissipation Factor for X5F is 1.5%;
HVC's X5F component can be Dissipation Factor value to 1%.
Maximun Voltage show on catalogue 30Kv,2200pf;
HVC’s show on catalogue(regular production)50Kv,3300pf.
Flash Testing 130% of Rated Voltage, like 30Kv, flash test be 40KvDc.
HVC’s dielectric strength can be 150% to 200%, means while saying rated voltage be 30Kv,flash testing can withstand
45Kv to 60KvDc.
Temperature characteristics :(NP0 to Z5U)
HVC’s temperate characterstics :(N4700,Y5T,Y5U)
European Brand G******:
offer only doorknob capacitor.
10Kv max capacitance 8000pf, while HVC be same 8000pf,same N4700 type material;
20kv max capacitance 4000pf, while HVC can be 10000pf;
30kv max capacitance 2700pf,while HVC can be 3300pf;
40kv max capacitance 2000pf,while HVC be same 2000pf;
50kv max capacitance 1700pf,while HVC can be 15000pf(Y5V) and 5000pf(Y5T).
G******:use N4700 material, Dissipation Factor be 0.3% max,while HVC always be around 0.1% and never higher
than 0.2%
G******:Insulation resistance 10,000mOhm(N4700) min, while HVC most time can be 200,000mOhm(N4700) min.
American Popular Brand H**:
offer only door knob capacitor, wildly use in North Amercian market.
Not know the dielectric material, dissipation factor value be max 0.5%,while HVC majorly use N4700 dielectric
material,dissipation factor be only 0.1% to 0.2%,most time 0.1% only.
North American Famous Brand H**:
widely sold in North America,Russia,Japan etc.offer both ceramic disc
capacitor and door knob capacitor.
For ceramic disc caps,only Y5P,Y5U dieletric material available,those offer not so good temperature coefficient, while
HVC offer N4700 for ceramic disc caps.
Highest voltage capacitance availability, H*** show is 20Kv 4700pf(Y5U), while HVC offer 50KV 3300pf(Y5T).
Isulation resistance is min 1000mOhm, while HVC’s I.R. can be 10 000mOhm
Dissipation factor is 5% max(Y5P), while HVC’s max D.F. be 2%(Y5U,Y5V)
European Brand M*****:
World famous company, offer door knob capacitor in different range,dieletric material in Y5U and
N4700 level.This big name’s product very concern to partial discharge value,their item can be very low pc on rated
AC voltage, While HVC offer nearlly same quality level of low pC.
Partial Discharge value be <5pC @ AC ratedVoltage.while HVC can be same <5pC on similar condition.
N4700 material with Insulation Resistance >=1011ohm ,While HVC’s own N4700 material be double,min 2x1011ohm
Japanese World Famous Brand T**:
this manufacturer is world class passive component manufacturer, with quite a lot different production
plant in the world, they also produce door knob capacitor,and invent their own ceramic material.dieletric material
be Z5T,Y5P and Y5S, those all only soso temperature coefficients,they don’t have N4700 material level,which
offer the high frequency and high dielectric strength function. Even more Y5S is a kinds of material not PB free.
But comply toRoHS “EU Directive 2002/95/EC, lead,cadmium, mercury, hexavalent chromium, and specific
bromine-based flame retardants, PBB and PBDE,have not been used, except for exempted applications” for high
voltage application, not need be lead free.But not lead free item can’t accpet by the some serious client. Biggest
voltage capacitance rate only 50kv 2100pf,but can see 20kvAC 1080p,this 20kvAC can be roughly equal to 80kvDC.
While HVC now able to make 150kvDc(50kvAC),800pf item, we HVC have higher production ability for higher end application.
Insulation Resistance be 100,000mOhm min,while HVC’s max I.R is double,min in 200,000mOhm.
Price Comparison for HVC and Others:
From above we know HVC’s quality level is quite high, we are among the same quality level of world famous brand
Vishay,TDK,Murata,Morgan etc… And we are sure in 20% to 30% lower cost in general.
Leadtime Comparison for HVC and Others:
HVC's standard production lead time for door knob capacitor be 60 days (8 weeks), while normally top brands need
14 weeks.
Flexibility Comparison for HVC and Others:
HVC's capacitor also offer flexible type component, like GIS (Gas Insulated Switchgear) customer,they
usually need a smaller size of high cap, we offernon-encapsulation cap to meet strict requirement. While
other manufacturer not flexible like us, or ask for quite big MOQ.
