High Current Transformer Service Conditions

a. Ambient air temperature: maximum 40℃, minimum -40℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.

b. Altitude: The altitude does not exceed 1000m (this is the routine requirement, if there is any different

requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requriments).

c. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.

d. The maximum wind speed does not exceed 34m/s.

e. Eerthquake intensity does not exceed 8 degree.

f. There have to be no gas that may seriously affect the insulation and conductive ability of electric       equipments,steam, ash, salt, chemical deposit, pollution and corrosive or explosive material.

Main Technical Parameters

1.1 Rated primary current is 50A~4000A.

1.2 Rated secondary current is 5A or 1A.

1.3 Rated frequency is 50Hz or 60Hz.

1.4 Rated output: 20VA~40VA (If any other rated output required, We can satisfy it.)

1.5 Accuracy classes and their combinations: Steady accuracy classes are 0.2S, 0.2, 0.5S, 0.5, 5P, 10P, PR and PX;

     transient accuracy classes are TPS, TPX, TPY and TPZ. There are 1~6 pcs secondary winding(s) in a CT.

1.6 Instrument security factor (FS) of measuring class is 5 or 10.

1.7 Accuracy limit factor (ALF) of protective class is 5, 10, 15, 20, 30 or 40.

1.8 Rated continuous thermal current Icth is 1.2In.

For rated short-time thermal current Ith (r.m.s.) and rated dynamic current Idyn (peak), please see Table 2.

Outline drawing and installation dimensions

Sihu Dry Type Power Transformer

一、Profile of products.

The power transformers are suitable installation for switchgears, and for power plants or substations self-consumption transformers or the places where small space, fire-control, moisture-proof, is needed.  

Select of the equipment for forced-air cooling: The cooling method of the product in a general way is natural air cooling, if there is a requirement of the client, we can collocate the system of forced-air cooling for the products of any rated power.

Select of the equipment for temperature display and control: The product can be collocated the equipment for temperature display and control. This equipment can show the temperature of the windings clearly during the product service, and there are many functions such as give an alarm, shut off the power when the trmperature exceed the requirement, turn on and turn off the forced-air cooling, it can be more safe for the product.

Select of the system for microcomputer measure, inspect and control: If the product collocate the microcomputer output connector when it collocate the equipment for temperature display and control, it can select the system for microcomputer measure, inspect and control, to actualize the roboticized manage of power transformer.

二、The functions of this system are as follow:

a) Temperature display and control (give an alarm, shut off the power when the trmperature exceed the requirement, turn on and turn off the forced-air cooling);

b) Electric power measure (can be calaulated the electric power automatically);

c) Inspect the service conditions (current, voltage, temperature, output power, load balance rate, power factor and so on);

d) Deposited the values (can be depositeded 3 years value of the service conditions automatically);

e) Show on line in the microcomputer screen (Show on line of the service conditions);

f) Manage software of the intelligential power transformer ( can be communicated well with person);

g) Printout automatically.

三、Select of the defend shell:

The products can select the beautiful and durable metal shells for more safe. The defend class can select IP20 and IP23 use for indoor. The IP20 shell can prevent the solid things that the diameters are more tham 12mm come into, they are the barriers for the products. IP23 shell can also defend that the drips which are less than 60°with the vertical line come into.

Note: IP23 shell can low down the ability of dissipate heat of the product 5-10%. The structure of the drawing 3 is suit for the indoor product, for the shell of outdoor product must design again.

We can design each kind of shell for the products can be suit for special environment.

四、Technical parameters please see table 1～2

Table 1

Table 2

* Clients can appoint a connection symbol different from the above table too, and declare it while ordering.

Note: The highest temperature rise of the products’ windings is 100K, their insulation class is F class, and their cooling mode is AN. 

五、Dimensions of the power transformers

For the outline and the installation dimensions please see drawing 1~2 and table 3~4.

Table 3  10kV Power Transformers Installation Dimensions

Drawing 1  10kV 30-2500kVA dry-type power transformers outline and installation dimensions

六、Table 4  35kV Power Transformers Installation Dimensions：

Drawing 2  35kV 30-500kVA dry-type power transformers outline and installation dimensions

Note: The outline and the installation dimensions of table 3 and table 4 are reference for the clients, the actual dimensions are according to the outline of the products.

Indoor Voltage Transformer Technical Parameters

Note: The data listed in the above table are the normal ones, or we can design them according to the customers’ special requirements.

4 Outline drawing and installation dimensions

Indoor Current Transformer Main Technical Parameters

Note: The data listed in the above table are the normal ones, we can design them according to the customers’ special requirements. (Standards: GB 20840.2 & IEC 61869-2)

Outline drawing and installation dimensions

Outdoor Current Transformer Main Technical Parameters

Note: The data listed in the above table are the normal ones, or we can design them according to the customers’ special requirements.

Outline drawing and installation dimensions

Service Conditins

1.Attitude:≤1000m 

2.Ambient temperature:-10℃~+40℃ 

3.Relative humidity ≤ 90% at the +20℃ ambient temperature .

4.NO gas,wopor or dust that may severely affect the insulation of contact box, no explosive or corrosive substance.

Epoxy Resin Cast Insulators Main technical Parameters

1. The coper contact to earth shall withstand power frequency test voltage(effective value )of 42kv for 5 minutes and lightning impulse vpltage (peak value)of 75kV.
2. The temperature of lead-out terminal shall not bemore than 65º C if the contact box is used for long time in rated current condition. (Please check below drawings for more infomation).

Outline drawing and dimensions of the insulators

Combined Instrument Transformer Main Technical Parameters

Product Feature

This HV measurement set consists of 2 single phase VTs, 2 single phase CTs and 1 surge arresters. The instrument transformers are insulated by outdoor epoxy resin which is suitable for outdoor use. This measurement set is with compact structure, small volume, high accuracy and excellent performance.

In order to meet the requirement of outdoor high voltage metering usage, 2 VTs are in V style connection and 2 CTs are connected serially to phase A and C. There are 2 surge arresters in the power inlet terminal. The voltage loop adopts anti-resonance design, which is rated to increase the primary current by 200% and has strong overload capacity.

Outline drawing and installation dimensions 

Electrical Schematic Diagram

Outdoor Voltage Transformer Main Technical Parameters

Notes:1) The data listed in the above table are the normal ones, or we can design them according to the customers’ special requirements.

          2)Standards: GB 20840.3 & IEC 61869-3.

Outline drawing and installation dimensions

Sihui Gas Insulated Current Transformer

一、Service Conditions 

a. Ambient air temperature: maximum 40℃, minimum -40℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.

b. Altitude: The altitude does not exceed 1000m (this is the routine requirement, if there is any different requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requirements)

c. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month

d. The maximum wind speed does not exceed 34m/s

e. Earthquake intensity does not exceed 8 degree

f. There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material.

二、Main Technical Parameters

4.1 Rated primary current is 50A~4000A

4.2 Rated secondary current is 5A or 1A

4.3 Rated frequency is 50Hz or 60Hz

4.4 Rate output 20VA~50VA (If any other rated output required, We can satisfy it.)

4.5 Accuracy class and t heir combinations: Steady accuracy classes are 0.2S, 0.2, 0.5S, 0.5, 5P, 10P, PR and PX;transient accuracy classes are TPS, TPX, TPY and TPZ. There are 1~6 pcs secondary winding(s) in a CT.

4.6 Rated operating pressure of the SF6 gas is 0.40MPa (0.50 MPa only for 500 kV); Minimum operating pressure of the SF6 gas is 0.35MPa (0.45 MPa only for 500 kV).

4.7 Instrument security factor (FS) of measuring class is 5 or 10.

4.8 Accuracy limit factor (ALF) of protective class is 5, 10, 15, 20, 30 or 40.

4.9 Rated continuous thermal current Icth is 1.2In.

4.10 For rated short-time thermal current Ith (r.m.s.) and rated dynamic current Idyn (peak).

Sihu Distribution Power Voltage Transformer

一、Service Conditions

a. Ambient air temperature: maximum 40℃, minimum -40℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.

b. Altitude: The altitude does not exceed 1000m (this is the routine requirement, if there is any different requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requirements).

c. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.

d. The maximum wind speed does not exceed 34m/s.

e. Earthquake intensity does not exceed 8 degree.

f. There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material.

二、Main Technical Parameters.

1. Table 1.

2. Table 2.

三、Outline dimensions drawing and structure.

Silicone Rubber Bushing Main Technical Parameters

Outline drawing and installation dimensions

High Voltage Isolator Switch Main Technical Parameters

 Dimensions of the voltage transformers

Sihui Capacitor Voltage Transformer

一、Service Conditions

a. Ambient air temperature: maximum 40℃, minimum -40℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.

b. Altitude: The altitude does not exceed 1000m (this is the routine requirement, if there is any different requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requriments).

c. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.

d. The maximum wind speed does not exceed 34m/s.

e. Eerthquake intensity does not exceed 8 degree.

f. There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material.

二、Main Technical Parameters

1. Rated frequency is 50Hz or 60Hz
2. Rated secondary voltage
3. Measuring secondary winding is 0.1/V 3 kV, 0.11/ V3 kV, 0.12/ V3 kV or 0.15/ V3 kV
4. Protective secondary winding is 0.1/ V3 kV, 0.11/ V3 kV, 0.12/ V3 kV or 0.15/ V3 kV
5. Residual voltage winding is 0.1kV, 0.11kV, 0.12kV, 0.15kV
6. Rated operating pressure of gas SF6 is 0.40MPa; Minimun operating pressure of the gas SF6 is 0.35MPa.

Rated output and relative accuracy class (cosφ=0.8 lag) please see Table 2.

Notes: 1. The quantity of windings, rated output and accuracy listed can be designed according to the requirements of the clients;

           2. Eeah thermal limit burden for protective winding is 2000 VA.

           3.The system earthing mode is effectively earthed neutral system.

Dimensions of the voltage transformers

High Voltage Switchgear Performance requirements

1)Rated voltage: 35kV, 66kV, 110kV, 132kV, 150kV, 220kV, 330kV, 380kV, 500kV, 750kV and 1000kV and so on.

2)Power-frequency withstand voltage performs the standards of GB/T 4109-2008 or IEC 60137:2003.

3)Rated lightning impulse, switching impulse and chopped lightning impulse withstand voltage perform the standards of GB/T 4109-2008 or IEC 60137:2003.

3)Measurement of partial discharge performs the standards of GB/T 4109-2008 or IEC 60137:2003.

4)Mechanical strength: performs the standards of GB/T 4109-2008 or IEC 60137:2003. Or according to the requirements of the clients.

5)Sealed performance: The products must support the rated pressure of SF6, and their gas leak are not exceed 0.1% annually.

Note: These are the routine performance requirements in the above listed, if there is any different required, we can design according to the requirements of the clients.

Main Technical Parameters

Dimensions of the voltage transformers

Sihui Low Voltage to High Voltage Transformers

一、Service Conditions

a. Ambient air temperature: maximum +40℃, minimum -45℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.

b. Altitude: The altitude does not exceed 1000m (this is the routine requirement, if there is any different requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requriments).

c. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.

d. The maximum wind speed does not exceed 34m/s.

e. Eerthquake intensity does not exceed 8 degree.

f. There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material.

二、Main Technical Parameters

1. Rated frequency: 50Hz or 60Hz
2. Rated primary voltage:66/√3, 110/√3, 132/√3, 150/√3 kV
3. Secondary voltage for metering:100/√3, 110/√3, 120/√3, 150/√3V                      
4. Secondary voltage for protection: 100/√3, 110/√3, 120/√3, 150/√3V
5. Residual winding voltage: 100,110,120,150 V
6. Accuracy class for metering: 0.2,0.5
7. Accuracy class for protction: 3P,6P
8. Accuracy class for residual winding: 3P,6P
9. Rated output for metering: 50,100,150,200 VA
10. Rated output for protaction: 50,100,150,200 VA
11. Rated output for residual winding: 100,200,300 VA
12. Thermal limited burden: 1000VA
13. Ambient air temperature: -45 ℃~+40 ℃
14. Altitude: ≤1000m, if need to design exceed 1000m, please declare in the order.

Note:System earthing conditions: Non-effectively earthed neutral system and effectively earthed neutral system.

三、Arcing distance and creepage distance of outer insulation please see table 1.

四、Insulation requirements for the primaries please see table 2.

五、Mechanical requirements for the primary terminals please see table 3.

六、Dimensions Of The Inductive Voltage Transformer

1.The outline and installation dimensions please see drawing 1.

2. The dimensions of the primary termanils please see table 4.

Notes: There may be any change of the dimensions for the inductive voltage transformer because of renewing, the clients must basis on the updated drawings.

                                              Sihui Small Electrical Transformer

Service Conditions

a. Outdoor

b. Ambient air temperature: -45 ~ +40℃(average value of the ambient air temperature does    not exceed 30℃ measured during a period of 24h).

c. Altitude ≤1000m(this is the routine requirement, if there is any different requirement, we can  provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requirements).

d. Application: There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material

e. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.

f. Max. wind speed ≤34m/s.

g. Earthquake intensity ≤ 7 degree.

Main technical Parameters

Rated frequency:50 or 60Hz

Rated primary current:50 ~ 4000A

Rated secondary current:1 or 5A

Rated output：10~60VA

Instrument security factor(FS) :5 or 10

Accuracy limit factor:10, 15, 20, 30, 40, 50 or 60

Accuracy class for metering cores: 0.2, 0.2S, 0.5, 0.5S, 1 or 0.3, 0.6, 1.2

Accuracy class for protective cores: 5P, 10P, PR, PX, TPS, TPX, TPY, TPZ or C10, C20, C50, C100, C200, C400, C800

Rated short-time thermal current: ≤40kA/3s

Rated dynamic current: ≤100kA

Creepage distance:31mm/kV

Arcing distance and creepage distance of outer insulation please see table 1.

Table 1

 Insulation requirements for the primaries please see table 2.

Table 2

Mechanical requirements for the primary terminals please see table 3.

Table 3

Dimensions of the Current Transformers

Table 4

Note: 

There may be any change of the dimensions for the current transformers because of renewing, the clients must basis on the updated drawings.