It is light, compact and highly reliable. It is well suited for Indian transmission and distribution network and can be used for uni directional or bi-directional metering, TOD metering, and for energy management. It is available for both HT and LT applications. Time-of-day TOD The meter offers a flexible tariff structure. During different times of the day for different seasons, different tariff structure can be programmed.
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Page 2 Theory of Operation 2. Page 4 failure and CT open are also indicated instantaneously. Forward Wh 2. Reverse Wh 3. Forward VArh 4. Reverse VArh and Tampers are recorded. Optically isolated serial interface using DCD. Page 5 High precision current transformers and voltage transducers step down input currents and voltages, that are fed to an Analog to Digital converter 2. The digital samples are processed to obtain various metering data that is stored in non-volatile memory.
Page 6 meters that use LED displays. Ruggedness and safety All components used the meter are of extended temperature range, which makes the meter ideal for tropical climates. The meter is safe for the user. Page 7 RTC with battery backup is used for time keeping. It has a calendar of years. Page 8 Method of energy computation: All energies are of fundamental component only. Page 9 minutes time blocks will be contracted by ten seconds each.
Page 10 Phase voltages. Format: Bit nos. Password protection on meter for DCD. No hardware protection. Time blocks by 10secs each. Page 12 Each meter is given a unique number at factory. Page 13 iii. Page 15 2. From this port Data Load survey and instantaneous can be collected, and Parameters can be configured.
Refer to Annexure C for details. Page 16 Re-packing If the meter has to be returned to the supplier, repack the unit in the packing in which it was supplied. Optimum Field Conditions For the reliability and better life of the product the unit has to be operated at moderate temperatures and humidity. Terminal cover is to be used to protect the meter terminals from being tampered with. Page 23 1. Communicating with the meter involves sending commands to the meter for reading and writing the particular register.
Each slave must be assigned a unique address and only the addressed slave responds to query that contains its address. Page 25 slave in response to a query. Page 26 addressed slave location. Page 27 The addressing allows up to Max. Broadcast mode is not allowed. The below example reads registers of R phase voltage from slave number 24 decimal. Since CT Primary is stored in the address and so to read CT Primary voltage both addresses should be read simultaneously.
Page 28 contents of holding register in the addressed slave. The addressing allows up to Max. The below example reads registers of Forward Active Cumulative energy from slave number 19 decimal. Since Forward Active Cumulative energy is stored in the address and so to read Forward Active Cumulative energy both addresses should be read simultaneously. Page 29 will be So to get the Forward Active Cumulative energy this particular value should be multiplied with the specified multiplication factor MF which is 0.
So x 0. Page 30 If the value is an illegal value then the response message will be an exception response Error message. For the details of maximum and minimum values of any parameter refer to manual. Query Message L. Page 35 N 1 for latest but one 15 mins block.
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