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50/1A cast resin 5P20 class protection current transformer for distance protective relay

Categories Current Transformer
Brand Name: GFUVE
Model Number: LZCG930-10
Certification: IEC60044-1; IEC 61869-2; NTC 2205; GB1208-2006
Place of Origin: Beijing, China
MOQ: 3 pieces
Price: USD 100-300 / piece
Payment Terms: L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability: 100000 pieces per month
Delivery Time: within 7 days
Packaging Details: standard export carton
Standards: IEC60044-1; IEC 61869-2; NTC 2205; GB1208-2006
Accuracy Class: 5P20, 5P10, 10P10, 10P20
Rated primary current: 30-600A
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
Dimensions (W×D×H) (mm): φ60xφ150x65
Weight (kg): 5
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    50/1A cast resin 5P20 class protection current transformer for distance protective relay

    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

    Cast resin straight-through current transformer

    WIRING DIAGRAMS

    Cast resin straight-through current transformer
    P1, P2 is primary polarity terminal, S1, S2 is secondary polarity terminal.
    P2, S2 is homonymous terminals (subtractive polarity).

    PARAMETERS

    Technical parameters 
    StandardsIEC60044-1; IEC 61869-2; ANSI C57.13; NTC 2205; GB1208-2006
    Rated primary current30-1000A
    Rated load≤20VA
    Rated frequency50Hz or 60Hz
    Rated secondary current5A or 1A
    Rated short-time thermal current40kA, 1S
    Rated continuous thermal current120%I1n
    Secondary winding power-frequency voltage3kV, 1min
    Instrument security factorFS ≤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 
    ConditionNo existence of severely begrimed, erosive and radioactive gas in the air. Permission of long-term operation under rated current.

    TECHNICAL DATA

    TypeLZCG530-10LZCG530-10LZCG530-10
    PurposeMeasuring current transformerProtection current transformerDouble 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)
    0.2S0.20.510P2010P1510P100.2S0.510P1510P10
    30  2       
    40  2.5       
    50  3.75  2    
    75 3.755 23.75    
    1002.557.5 2.53.75    
    15057.5102.53.756.252.53.75 2.5
    2007.510153.7557.557.5 3.75
    30010152057.5107.5102.55
    4001520256.257.5151012.53.755
    5002025256.257.51515153.755
    6002030307.5102015203.757.5

    SELECTION GUIDE

    ModelPrimary rated currentRated loadAperture (mm)Description (mm)Weight (kg)MaterialWater-proof
    LZCK-55100-1500A≤10VAφ55180×138×522PCIP65
    LMCK185-10300-3000A≤25VAφ185350×283×554.5PCIP65
    LZCK310-10300-600A≤10VAφ50φ50 x φ110 x 321Resinsilicon case (option)
    LZCK322-1030-600A≤10VAφ50φ50 x φ110 x 521.6Resinsilicon case (option)
    LZCK350-1020-600A≤25VAφ50φ50 x φ110 x 1053.1Resinsilicon case (option)
    LZCG930-1030-600A≤20VAφ45φ45 x φ120 x 652.1Resinsilicon case (option)






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