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Measuring Current Transformers

Measuring Current Transformers
Measuring Current Transformers
Product Code : MCT 002
Product Description

Measuring current transformers of the W…, W…-8000 series

Product description:
The highly sensitive W… and W…-8000 series measuring current transformers convert AC currents into evaluable measurement signals, in combination with RCM resp. RCMS series residual current monitors and evaluators. In addition, the measuring current transformers can be used in combination with insulation fault location systems (EDS) for IT systems. They are designed to measure the locating current generated by a PGH locating current injector or an ISOMETER® IRDH. In combination with EDS series insulation fault locators the test current is converted into evaluable signals. Connection to the respective devices is via a two-wire cable.
Technical data
Insulation coordination acc. to IEC 60664-1
Rated insulation voltage 800 V
Rated impulse voltage/pollution degree 8 kV/3
CT circuit W…
Rated primary residual current 10 A
Rated secondary residual current 0.0167 A
Rated transformation ratio Kn 10/0.0167 A
Rated burden max. 180
Nominal power 0.05 VA
Rated continuous thermal current Icth 40 A
Rated short-time thermal current Ith 60 x Icth = 2.4 kA/1 s
Rated dynamic current Idyn 2.5 x Ith = 6.0 kA/40 ms

Measuring current transformers W0-S20…W5-S210 W10/600

Product description

The highly sensitive W0-S20…W5-S210 series measuring current transformers convert residual currents up to 100 A into evaluable RCM or EDS signals. The CTs are connected to the respective evaluator by two wires. Depending on the connecting lead used, the distance between the CT and the evaluator may be up to 40 m Care should be taken that all current-carrying conductors are passed through the CT and that these conductors are not shielded. Never route a PE conductor through the measuring current transformer!

Typical applications

• For residual current monitors (RCM)
• For residual current monitoring systems (RCMS)
Technical data

Insulation coordination acc. to IEC 60044-1
Highest system voltage for electrical equipment Um AC 720 V
Rated impulse withstand voltage Uisol 3 kV
Measuring circuit
Rated transformation ratio 600/1
Rated burden 180 Ω (18 Ω at 100 A)
Phase displacement <4°
Rated primary current 10 A (100 A)
Rated primary current 10 mA
Nominal power 50 mVA
Internal resistance 5…8
Secondary overvoltage protection with suppressor diode P6KE6V8CP
Accuracy class 3
Rated continuous thermal current 100 A
Rated short-time thermal current 14 kA 1 s
Rated dynamic current 35 kA 30 ms
Environment

Standard IEC 60044-1
Shock resistance IEC 60068-2-27 (device in operation) 15 g/11 ms
Bumping IEC 60068-2-29 (transport) 40 g/6 ms
Virbation resistance IEC 60068-2-6 (device in operation)
W1-S35…W3-S105 1 g/10…150 Hz
W4-S140, W5-S210 1 g/10…150 Hz/0.075 mm
Vibration resistance IEC 60068-2-6 ( device not in operation) 2 g/10…150 Hz
Ambient temperature (during operation/during storage) -10…+ 50 °C/-40…+ 70 °C
Climatic class acc. to DIN IEC 60721-3-3 3K5

Connection
Connection screw-type terminals
Connection
rigid/flexible 0.2…/4/0.2…2.5 mm²
flexible with ferrules with/without plastic sleeve 0.25…2.5 mm²
Conductor sizes (AWG) 24…12
Connection to the evaluator
single wire ≥ 0.75 mm² 0…1 m
single wire, twisted ≥ 0.75 mm² 0…10 m
shielded cable ≥ 0.6 mm² 0…40 m

Measuring current transformers of the WR… series

Product description

The highly sensitive WR… series measuring current transformers of rectangular type convert AC currents into evaluable measurement signals, in combination with RCM and RCMS series residual current monitors and evaluators. In addition, the measuring current transformers can be used in combination with insulation fault location systems (EDS) for IT systems. They are designed to measure the locating current generated by a PGH locating current injector or an ISOMETER® IRDH. In combination with EDS series insulation fault locators the test current is converted into evaluable signals. Connection to the respective devices is via a two-wire cable.

Standards

WR… series measuring current transformers comply with the device standards: IEC 60044-1, DIN EN 60044-1, IEC 60044-1.

Installation instructions
• Make sure that all live conductors are routed through the measuring current transformer
• Do not route shielded conductors through the measuring current transformer
• Never route a PE conductor through the measuring current transformer!
Technical data
Insulation coordination acc. to IEC 60664-1/IEC 60664-3
Rated insulation voltage 800 V
Rated impulse voltage/pollution degree 8 kV/3
CT circuit
Rated primary residual current 10 A
Rated secondary residual current 0.0167 A
Rated transformation ratio Kn 10/0.0167 A
Rated burden max. 180 Ω
Nominal power 0.05 VA
Rated continuous thermal current Icth 40 A
Rated short-time thermal current Ith 60 x Icth = 2.4 kA/1 s
Rated dynamic current Idyn 2.5 x Ith = 6.0 kA/40 ms
Connection
Connection cage clamp spring terminal
Connection
rigid/flexible/conductor sizes 0.08…2.5/0.08…2.5 mm² (AWG 28…12)
Stripping length 8…9 mm
Environmental conditions
Operating temperature -25…+70 °C
Climatic class acc. to IEC 60721
Stationary use (IEC 60721-3-3) 3K5 (except condensation and formation of ice)
Transport (IEC 60721-3-2) 2K5 (except condensation and formation of ice)
Long-time storage (IEC 60721-3-1) 1K5 (except condensation and formation of ice)
Classification of mechanical conditions acc. to IEC 60721
Stationary use (IEC 60721-3-3) 3M4
Transport (IEC 60721-3-2) 2M2
Long-time storage (IEC 60721-3-1) 1M3

Tape Wound Measuring and Protection Current Transformers

Construction

High grade silicon iron cores are carefully selected, then insulated and protected by a polypropylene covering on which the secondary winding is toroidally wound by precision winding machines. Multi layers of polyester and PVC are then applied to provide a tough moisture resistant coating.

Benefits
 
Features
  • Long product life Applications
  • Switchgear
  • Control panels
  • Overload protection
  • Control devices
 
  • Available in a wide range
    of transformer ratings
  • Accuracy up to Class 0.1
  • Measuring or protective types
Specifications
System voltage: 720V maximum
Test voltage: 3kV for 1 minute
System frequency: 50/60Hz
Overload withstand: 1.2 x rated current continuously
Short circuit thermal 60 x rated primary current for 1 second
current (Ith)*:  
Dynamic current (Idyn)*: = 2.55 x Ith
Service temperature: -20°C to 70°C
Secondary current: 5A or 1A
Complies with: IEC60044-1, BSEN60044-1
Saturation coefficient: <6
Humidity: Up to 95% RH (non condensing)
Insulation class: BSEN60085 Class Y
Mounting hardware: Foot mounted

Miniature & Moulded case Current Transformers

A range of Wedding ring Miniature Tape wound Current transformers whose size permits PCB mounting. Designed to convert high currents to low level electronic signals. Available in tape wound with ring or foot mounting versions or in a moulded case.

Specifications
Primary current range: 10A-100A
Secondary output: 10mA-100mA
VA output: 0.015VA-0.15VA
System frequency: 50/60Hz
Service temperature: 0°C to + 80°C
Insulation class: BSEN60085 Class Y
Operating voltage: 720V AC
Test voltage: 2kV DC
Accuracy  
20-80%: 1.5%
81-120%: 1%

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