Position

Since the introduction to the market of the low current grounding line selection device in 1980’s, several generations of improved devices have been brought to the market with much better accuracy in line selection. However, the error rate is still at an high level in line selection for those improved systems.In order to completely eliminate the errors in line selection and provide customers a device with ultimate satisfaction, we formed a task force team to develop our own device, TLX99. The team conducted systematic investigation on the low current grounding line selection devices, and studied carefully the problems existed in the products supplied by all the other vendors. The study and analysis showed that the following two facts are the key causes of the errors in line selection:

1) The criteria used in most of the devices are defective

2) There are defects in the design of the hardware, the computation methods, and the software.

These two problems have been solved by the team after several years effort in research and development. New Criteria and computation methods have been developed; advanced design in hardware and software have been achieved. The new product, TLX99, a Microcomputer Resonance-suppression Low Current Grounding Line Selection device is the final solution for the customers who have been troubled for many years.

Technical Specifications

1）Voltage range: 3KV ~ 66KV system.

2）Resonant frequency: one-tenth, one fifth, one third, one half times fundamental frequency、fundamental frequency, triple, five times, seven times and nine times the frequency.

3）Circuits applicable:1~4 ways.

4）Elimination response time: £100 ms.

5）The voltage measurement accuracy: 1%.

6）Frequency measurement accuracy: ±0.2Hz.

7）Power consumption of the device PT: ≤0.5VA.

8）Capacity of the relay output contactor: AC 220V/0.3A，DC 30V/2A.

9）Means of communication: RS-232C, RS-485

10）Rate of communication: 600­­bps~19200bps.

11）Power for the device: 85V~265V AC or 100V~300V DC;

12）Ambient temperature: -10^oC~+50^oC, relative humidity £ 90% (when air temperature is about 20 ^oC)

13）Mechanical properties, insulation, moist heat, impact of voltage and electromagnetic compatibility compliance with the      IEC and the corresponding national standards.

14）The device has adopted the transient suppression circuits, enhanced the anti-interference ability such as lightning