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TOL-20-4

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Current transformer TOL-20-4 (TOL204, TOL 20 4, TOL-204, TOL 204, TOL20-4, TOL20 4, TOL-20-IV)
 
Current transformer TOL-20-4 is designed for installation in Switchgear (switchgear, metal-clad switchgear, CSR) and is used for signal transmission measurement data measuring instruments and (or) protection and control, to isolate the chains of secondary compounds of high-voltage electrical installations AC voltage class up to 20kV 50Hz or 60Hz.
Transformer with primary vertical rails is in the title of the designation BB, after the designation of the number of windings.
 
Technical characteristics of the instrument current transformers TOL-20-4:
 
The number of secondary windings - 4;
Rated voltage - 20kV;
Maximum operating voltage of the device current transformer TOL-20-4 - 24 kV;
Rated frequency AC - 50Hz or 60Hz;
Rated secondary current of the current transformer unit TOL-20-4 - 1A, 5A;
Rated primary current - 5A, 10A, 15A, 20A, 30A, 40A, 50A, 75A, 80A, 100A, 150A, 200A, 300A, 400A, 600A, 750A, 800A, 1000A, 1200A, 1500A, 2000A, 2500A, 3000A;
Accuracy class of the instrument current transformer TOL-20-4:
- Secondary winding for measurement - 0,2 S, 0,2, 0,5 S, 0,5, 1, 3;
- Secondary protection - 5P, 10P;
Rated secondary current transformer load device TOL-20-4 with a power factor:
- Cos φ = 1 - secondary winding for measurement - A · 1B, 2B · A · 2.5 A;
- Cos φ = 0,8 - secondary winding for measurement - 3V-50V · A · A;
- Cos φ = 0,8 - secondary protection - 3V-50V · A · A;
Rated current ratio secondary instrument current transformer TOL-20-4 for protection - 10;
Nominal safety factor of instruments for measuring the secondary - 10, 15, 17, 21;
A one-second thermal current instrument transformer current TOL-20-4:
- At rated primary current 5A - 0.40 kA
- At rated primary current 10A - 0.78 kA
- At rated primary current 15A - 1.20 kA
- At rated primary current 20A - 1.56 kA
- At rated primary current 30A - 2.5 kA
- At rated primary current 40A - 3.0 kA
- At rated primary current 50A - 5.0 kA
- At rated primary current 75A - 5.85 kA
- At rated primary current 80A - 6.83 kA
- At rated primary current 100A - 10.0 kA
- At rated primary current 150A - 12.5 kA
- At rated primary current 200A - 20.0 kA
- At rated primary current 300A - 31.50 kA
- At rated primary current 400A - 31.50 kA
- At rated primary current 600A-2000A - 40.0 kA
- At rated primary current 2500A, 3000A - 61.0 kA
Rated peak withstand current instrument transformer TOL-20-4:
- At rated primary current 5A - 1.0 kA
- At rated primary current 10A - 1.97 kA
- At rated primary current 15A - 3.0 kA
- At rated primary current 20A - 3.93 kA
- At rated primary current 30A - 6.25 kA
- At rated primary current 40A - 7.56 kA
- At rated primary current 50A - 12.80 kA
- At rated primary current 75A - 14.70 kA
- At rated primary current 80A - 15.70 kA
- At rated primary current 100A - 25.50 kA
- At rated primary current 150A - 31.80 kA
- At rated primary current 200A - 51.0 kA
- At rated primary current 300 A - 81.0 kA
- At rated primary current 400A - 81.0 kA
- At rated primary current 600A-2000A - 102.0 kA
- At rated primary current 2500A, 3000A - 152.50 kA
Test voltage instrument transformer current TOL-20-4:
- One-minute power frequency - 42kV;
- Lightning impulse full - 75Sqr;
Please note:
*) In accordance with the order can be delivered accuracy class 5P.
**) Specified in the order;
The estimated value of the resistance of the secondary winding device CT TOL-20-4 DC are shown in Table 2;
 
Table 2 Calculated values ​​of the resistance of the secondary winding device CT TOL-20-4 DC
 
Rated current of the device current transformer TOL-20-4
Accuracy class
DC resistance of the windings
5A-600A
№ 1
Number 2
#3
№4
0.16 Ohm
0.22 Ohm
022 Ohm
0.22 Ohm
400A
№ 1
Number 2
#3
№4
0.214 Ohm
0.3 Ohm
0.3 Ohm
0.3 Ohm
750A
№ 1
Number 2
#3
№4
0.19 Ohm
0.28 Ohm
0.28 Ohm
0.28 Ohm
800A
№ 1
Number 2
#3
№4
0.214 Ohm
0.3 Ohm
0.3 Ohm
0.3 Ohm
1000A
№ 1
Number 2
#3
№4
0.24 Ohm
0.32 Ohm
0.32 Ohm
0.32 Ohm
1200A
№ 1
Number 2
#3
№4
0.3 Ohm
0.39 Ohm
0.39 Ohm
0.39 Ohm
1500A
№ 1
Number 2
#3
№4
0.36 Ohm
0.48 Ohm
0.48 Ohm
0.48 Ohm
2000A
№ 1
Number 2
#3
№4
0.51 Ohm
0.59 Ohm
0.59 Ohm
0.59 Ohm
2500A
№ 1
Number 2
#3
№4
0.66 Ohm
0.76 Ohm
0.76 Ohm
0.76 Ohm
2500A *
№ 1
Number 2
#3
№4
0.53 Ohm
0.6 Ohm
0.6 Ohm
0.6 Ohm
3000A *
№ 1
Number 2
#3
№4
0.64 Ohm
0.64 Ohm
0.64 Ohm
0.64 Ohm
 
Note: * - TOL-20-2 (3, 4) BB-1;
Calculated values ​​of the nominal current ratio of secondary winding for protection in terms of rated secondary load in accuracy classes 5P and 10P for the instrument current transformer TOL-20-4 are shown in Table 2;
 
Table 2 Calculated values ​​of the nominal current ratio of secondary winding for protection in terms of rated secondary load in accuracy classes 5P and 10P for the instrument current transformer TOL-20-4
 
Rated secondary current transformer load device TOL-20-4, VA
3
5
10
15
20
30
40
50
Ratio of transformation
Rated current ratio
(5-15) / 5, 30/5, 50/5, 75/5, 100/5, 150/5, 300/5
36
27
16
12
10
6
4.5
3,5
40/5, 80/5, 200/5, 400/5
42
32.5.
20.5
14
8
6
5
(5-300) / 5
28.5
23
15.5
12
7
5
4
600/5
28.5
23
15.5
12
7
5
4
750/5
30.5
25.5
17.5
13.5
8
6
5
800/5
30.5
25.5
18
14
8
6.5
5
1000/5
25.5
21
15.5
12
7
5.5
4.5
1200/5
26.5
22,5
17
13.5
8
6.5
5.5
1500/5
27.5
23.5
18.5
15
9
7.5
6.5
2000/5
22
18
14.5
12
8
6.5
5.5
2500/5
22
17
14
12
8.5
7
6
3000/5
23.5
18
15
13
9
7
6
 
General view of the device shown in Figure 1;
 
Figure 1: General view of the instrument current transformer TOL-20-4
 
TOL-20-4 - Current transformer - Drawing.
 
Weight of the device current transformer TOL-20-4 - 32kg-35kg;
The transformers are manufactured in climatic design "O" and "U" and are intended for indoor use in:
Height above the sea level - no more than 1000 m.
- Ambient temperature with the heat the air inside the switchgear - from -10 ° C to +50 ° C;
- Environment explosive, without dust, reactive gases and vapors in concentrations destroy metal and insulation;
- Working position - any;
- Internal insulation casting, heat resistance class "B" and flammability class FH (PG) 1;
- Instruments earthquake resistant when exposed to earthquake intensity 8 points on the MSK-64 at the facility level above ground level up to 70m;
- Appliances intended to be sold in AS, with class security for 3H-001 NP-97 and 2 seismic category for NP-031-01;
- Devices comply with immunity to electromagnetic interference to influence the magnetic field of industrial frequency;
- Equipment CT TOL-20-4 conform to standards of industrial radio class A, Group 1;
In current transformers may be used to account for the secondary windings, Class 0,2 S and 0,5 S with the value of the secondary load below 25% of nominal;
The minimum weight for the device current transformer windings TOL-20-4 accuracy classes 0,2 S and 0,5 S is 1B · A;
The certificate on the current transformers with secondary windings for accounting accuracy classes 0,2 S and 0,5 S indicates the measured current and the angular error at rated secondary burden 1B · A;
Can manufacture transformers with different transformation ratios of secondary windings;
The manufacturer guarantees that the quality of the instrument current transformer TOL-20-4 technical requirements specifications provided the customer terms and conditions of storage, transportation, installation, operation, and its specified operational documentation.

Photos: TOL-20-4

TOL-20-4 transformer image.
TOL-20-4 transformer image.
TOL-20-4 transformer scheme.
TOL-20-4 transformer scheme.


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