Established in 1998, China Dianshen Electric Co., Ltd. is a professional protection relay manufacturer and protective relay design of electric and electronic products. Together with the European 'CE', 'CCC', GS/EMC/LICE/UL/CSA, and 'CB' (IEC) certification that we have received for various series. Currently, our custom protection relay product series are being exported worldwide. Our pursuit of first-rate quality, competitive and cheap protective relay prices and comprehensive after-sales services offers both potential and long-standing clients confidence in our company.

The relay STR is intended for the complete protection of high power motors with medium voltage or low voltage supply. Several protection functions incorporated in a single relay assure the protection of the motor against all the different fault conditions; overheating caused by mechanical overload or by an abnormal supply, locked rotor, too long starting, interruption of one phase conductor, current unbalance, short circuit between phases, short circuit between turns, earth fault, underload running, too frequent startings.
three input measuring circuits for the line currents
measuring circuit, provided with a band pass filter for residual current
protection functions and final relays completely programmable by user
direct read-out of all quantities by means of digital display on the front panel
counting of the number of operations performed by each function
storing the values of input quantities corresponding to the last operation
optional blocking circuit to perform accelerated protection schemes
serial communication circuit
continuous monitoring of internal circuits

SEPCOS-PRO is an autonomous, microprocessor-controlled line fault detector. It is a new high-tech generation of protection relay that satisfies the most demanding safety requirements applicable to DC electrical power transmission networks.
SEPCOS-PRO is used for monitoring traction network segments and for logging events. It analyses the current gradient through cyclic measurements at the supply point of the substation to the catenary. The measurements are made via electrically isolated transducer (for example MIU 10).
This protection relay is developed for installation in DC switchgear or rectifier unit of DC substation of public transport systems such as streetcars, underground railway, commuter trains or trolley buses.
With SEPCOS-PRO, Sécheron have developed a completely new generation of line fault detectors. Designed as a universal unit it replaces the SEDEL and the DDL series which in the past has demonstrated its usefulness and efficiency in many applications.
SEPCOS-PRO development is based on the safety requirement of the railway standards EN50126 / EN 50128 and EN 50129 according to safety integrity level SIL 2.

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