Surge Arrestor; Disconnectors; Instrument Transformers

Surge Arrestor:

We supply the surge arrestors cover 35kv~lOOOkv porcelain-housed MOA, 6kv~750kv polymeric MOA, 66kv~750kv GIS MOA, MOA for specific applications and conditions such as MOA for high altitude or heavy pollution regions, 3-phases combined MOA for limiting inter-phase and phase-to-ground voltage surges, 6kv~35kv harmonic suppressor, non-linear resistors for electric locomotives, monitors and discharge counters for MOA etc. DC and AC MOA and other accessories manufactured according with IEC60099-4

Disconnectors:

The switch-disconnector is largely used as the main switch in low voltage switchgears for distribution of power, starting and stopping motors and isolating loads during maintenance.
They are also enclosed in metal or plastic boxes as safety switches to ensure that accidental start of machines is prevented.

The range from 16 to 160 Amp are either base plate or door mounted by snap-on or screw fitting.
Front operated 3-, 4-, 6-, 8-pole and change over types are available as standard.

From 200 up t0 3150 Amp the switchdisconnectors, also called load break switches, are designed as pole modules and they are avail-able as l- t0 4-pole versions, front or side operated.

Instrument Transformers:

An instrument transformer's role is to provide accurate inputs to protection, control and metering systems including revenue metering.
The main tasks of instrument transformers are:
. T0 transform currents or voltages from a usually high value to a value easy to handle for relays and instruments.
. To insulate the metering circuit from the primary high voltage system,
. To provide possibilities of standardizing the instruments and relays to a few rated currents and voltages.

. Current Transformers
The primary winding in a current transformer is incorporated in the line and carries the current flowing in the network. The magnitude of the secondary current is dependent of the ratio of the transformer.

. Voltage Transformers
ABB outdoor voltage transformers are single-phase design and intended for connection between phase and ground in networks with insulated or direct grounded neutral points.

. Combined Current/Voltage Transformers
Above a service voltage of 110 KV instrument transformers are frequently manufactured as combined current and voltage transformers,

. Coupling Capacitor
Coupling capacitors types CCA (standard capacitance) and CCB (extra high capacitance) are intended for power line carrier applications.