50/1A cast resin 5P20 class protection current transformer for distance protective relay
LZCG930-10 high precision protectioncurrent transformer is suitable for microcomputer protection of electrical equipment in 10KV and 35KV AC power system. It is widely used in not only compact fully insulated ring network switchgears such as ABB-SafeRing/ SafePlus, Uniswitch, Schneider RM6, SM6, Siemens 8DJ10/8DH10, Simosec, FBX, Fluokit, Omar Garbo GA, GAE; SEL TPS(Q); VEI Unifluorc; Eaton SVS/12 ring network, but also cable distribution boxes because of its small size, light weight, openable and convenient installation.
The protection current transformer is used to reduce the currents in power systems, producing proportional currents in the unit’s secondary windings that remain isolated from the main circuit. The replica current is then used as an input to a protective relay, which can then automatically isolate part of the power circuit should it experience a fault.
Protection Current Transformers are designed to measure the actual currents in power systems and to produce proportional currents in their secondary windings which are isolated from the main power circuit.
protection cts are used for protection against over current or faulty current, their secondary is
thusconnected to the protection relays and the to the tripping coil. there may be series or shunt
tripmechanism, thus the burden(VA) of protection ct is more as compared to metering cts.
The classification of protection current transformers follows the following simple formula: "10 P10" Manufacturers of protection devices will normally specify the classification for the
protection current transformer intended to operate the particular protection device concerned.
This is required for protection CT, because the fault current is high and the CT should be able tosense the high fault current accurately to protect the system. The common numbers are 10, 15, 20 and 30. Class PS: PS is for 'Protection Special'. This class of CT's are used for special
Protection such as differential protection, distance.
MODEL MEANING
WIRING DIAGRAMS
P1, P2 is primary polarity terminal, S1, S2 is secondary polarity terminal.
P2, S2 is homonymous terminals (subtractive polarity).
PARAMETERS
| Technical parameters |
| Standards |
IEC60044-1; IEC 61869-2; ANSI C57.13; NTC 2205; GB1208-2006 |
| Rated primary current |
30-1000A |
| Rated load |
≤20VA |
| Rated frequency |
50Hz or 60Hz |
| Rated secondary current |
5A or 1A |
| Rated short-time thermal current |
40kA, 1S |
| Rated continuous thermal current |
120%I1n |
| Secondary winding power-frequency voltage |
3kV, 1min |
| Instrument security factor |
FS ≤10 |
| Mechanical parameters |
| Dimensions (W×D×H) (mm) |
φ45xφ120x65 |
| Weight (kg) |
2.1 |
| Operating conditions |
| Operating temperature |
-35°C to +55°C |
| Daily average temp |
<+40°C |
| Altitude |
<3500 meters |
| Operating conditions - continued |
| Condition |
No existence of severely begrimed, erosive and radioactive gas in the air. Permission of long-term operation under rated current. |
TECHNICAL DATA
| Type |
LZCG530-10 |
LZCG530-10 |
LZCG530-10 |
| Purpose |
Measuring current transformer |
Protection current transformer |
Double winding current transformer |
| Rated primary current (AMP) |
Accuracy class and rated load(VA) |
Accuracy class and rated load(VA) |
Composite accuracy class and rated load(VA) |
| 0.2S |
0.2 |
0.5 |
10P20 |
10P15 |
10P10 |
0.2S |
0.5 |
10P15 |
10P10 |
| 30 |
|
|
2 |
|
|
|
|
|
|
|
| 40 |
|
|
2.5 |
|
|
|
|
|
|
|
| 50 |
|
|
3.75 |
|
|
2 |
|
|
|
|
| 75 |
|
3.75 |
5 |
|
2 |
3.75 |
|
|
|
|
| 100 |
2.5 |
5 |
7.5 |
|
2.5 |
3.75 |
|
|
|
|
| 150 |
5 |
7.5 |
10 |
2.5 |
3.75 |
6.25 |
2.5 |
3.75 |
|
2.5 |
| 200 |
7.5 |
10 |
15 |
3.75 |
5 |
7.5 |
5 |
7.5 |
|
3.75 |
| 300 |
10 |
15 |
20 |
5 |
7.5 |
10 |
7.5 |
10 |
2.5 |
5 |
| 400 |
15 |
20 |
25 |
6.25 |
7.5 |
15 |
10 |
12.5 |
3.75 |
5 |
| 500 |
20 |
25 |
25 |
6.25 |
7.5 |
15 |
15 |
15 |
3.75 |
5 |
| 600 |
20 |
30 |
30 |
7.5 |
10 |
20 |
15 |
20 |
3.75 |
7.5 |
SELECTION GUIDE
| Model |
Primary rated current |
Rated load |
Aperture (mm) |
Description (mm) |
Weight (kg) |
Material |
Water-proof |
| LZCK-55 |
100-1500A |
≤10VA |
φ55 |
180×138×52 |
2 |
PC |
IP65 |
| LMCK185-10 |
300-3000A |
≤25VA |
φ185 |
350×283×55 |
4.5 |
PC |
IP65 |
| LZCK310-10 |
300-600A |
≤10VA |
φ50 |
φ50 x φ110 x 32 |
1 |
Resin |
silicon case (option) |
| LZCK322-10 |
30-600A |
≤10VA |
φ50 |
φ50 x φ110 x 52 |
1.6 |
Resin |
silicon case (option) |
| LZCK350-10 |
20-600A |
≤25VA |
φ50 |
φ50 x φ110 x 105 |
3.1 |
Resin |
silicon case (option) |
| LZCG930-10 |
30-600A |
≤20VA |
φ45 |
φ45 x φ120 x 65 |
2.1 |
Resin |
silicon case (option)
|
