The main products

Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

PTQ-PDPMV1 Ethernet module

Time delay The delay required between the picking up of the relay ('Start') and tripping ('Trip') is set by means of parameter ‘Delay’. The setting range provided is 0.05 to 60 s in steps of 0.01. C.t./v.t. inputs The two c.t. and v.t. input channels ‘CurrentInp’ (current) and ‘VoltageInp’ (voltage) have to be configured for the purpose. The current input channel may only be allocated to a single-phase metering (core-balance) c.t. and the voltage channel to a singlephase v.t. Binary inputs and outputs The tripping output may be allocated to either a tripping relay or a signalling relay (different parameters) and the starting signal to a signalling relay. Operation of the sensitive E/F protection can be inhibited by applying a signal to the ‘BlockInp’ input.

Sensitive earth fault protection for grounded systems (EarthFltGnd2) A. Application High-resistance earth faults, which cannot be detected by the distance protection, can still cause appreciable problems in spite of the relatively low fault currents involved. The sensitive E/F protection function has been included to complement the main line protection function and cover the low E/F current range. The protection processes the zero-sequence components 3I0 and 3U0. B. Features
DC component filter
harmonic filter
directional measurement of zero-sequence components (derived either internally or externally)
current pick-up enabling level
reference voltage enabling level
adjustable characteristic angle
permissive and blocking transfer tripping schemes
echo logic for weak infeed and open circuit-breaker
transient blocking logic for reversal of energy direction.

Apparent power

 The apparent power component of the neutral power is monitored to detect E/F's in ungrounded systems. Every feeder is equipped with a relay. During an E/F, the capacitive E/F current of the entire system less that of the faulted line flows into the faulted line. Only the E/F relay of the faulted line indicates power flowing into its line. The minimum capacitive E/F current available to operate the relays is the total capacitive E/F current of the whole system for the smallest configuration to be expected less that of the faulted line. Of this capacitive current, only the percentage corresponding to the assumed minimum displacement voltage at which the protection is still required to operate may be considered. If there are any double-circuit lines, the division of current between the circuits must also be taken into account. To allow for the c.t. errors at such low current levels, the pick-up value set on the relay must be less than the product of the minimum current determined above and the minimum voltage. The parameter ‘Angle’ must be set to -90° pick up for E/F's in the forwards direction and 90° for the reverse direction. Note: The connections are made in strict accordance with the ABB wiring diagram.