Zero-Phase Current Transformers (ZCT) for Ground-Fault Protection
About the Product
These zero-phase molded current transformers protect the power system against leakage and earth faults. Each of these current transformers has an insulation level of 0.72 kV and requires a suitably insulated primary conductor. When the leakage current at the CT primary reaches a certain level, the CT secondary provides the necessary current signal or voltage signal – according to the type of protective relay in use – for the protection of the power system. EZ Series products are available in various window diameters.
- Standards: JEC, IEC or IEEE
- Indoor application
- For a grounded or ungrounded system (see table below)
- Insulation: Araldite® epoxy resin
- Insulation Level: 0.72 kV
- Frequency: 50 or 60 Hz
- Other standards and specifications available upon request
- Related Products
EO1M6, EO1M20, EO1M150
These epoxy-cast multi-ratio bushing current transformers (BCTs, or bushing CTs) are typically installed in 23 kV C-GIS (cubicle-type gas-insulated switchgear) for use with measuring or monitoring instruments, or protective relays.
Low-Voltage Current Transformers / Extended Range Current Transformers (ERCTs) for Billing, Window-Type
For 600V (max.) power systems, these current transformers offer a 0.3 Metering Class accuracy. ERCT specifications also available. Secondary side includes a short-circuiting device. Terminal cover sealable. Various window diameters and current ratios.
1 core. Rectangular, low-voltage, resin-insulated current transformers for switchgear-panel makers et al. For use with measuring or monitoring instruments. This current transformer can be mounted on a busbar or fixed directly to the switchgear panel.
EOS-RN / EOS-RM Series
Current transformers with a Primary Current of 100A~3200A. Burden & Accuracy: 15～30VA/1.0CL. Wiring with insulated wire or a busbar on the primary side. Alternative billing-purpose usage. Many window sizes.
Suited to power transmission and distribution systems and intended to work with measuring or monitoring instruments, or with protective relays, these bushing CTs (BCTs) can also be used with GIS or in conjunction with power transformers bushings. Insulation tape or epoxy resin as insulation material.
Outdoor, ring-core (window-type) protective (or monitoring) current transformer for power companies or HV power systems. Converting high AC currents into signals to be received by the relay. Cycloaliphatic Epoxy.
Window-type (split-core), outdoor, protective (or monitoring) current transformer for power companies or HV power systems. Converting high AC currents into signals to be received by the relay. Cycloaliphatic Epoxy.
- Download Materials
Easy-to-print document, containing product description, pictures, various models and frequently requested specifications.
How to select, based on application and power system attributes, the primary and secondary currents, burden, accuracy, rated frequency, type (indoor vs. outdoor), insulation material, etc.