1. Overview

The DTS1791/DSS1791 three-phase rail electronic energy meter is a new type of three terminal electronic energy meter developed by our company using microelectronics technology to measure electrical energy, imported specialized large-scale integrated circuits, and advanced technologies such as digital sampling processing technology and SMT technology. This electric energy meter fully complies with the relevant technical requirements for Class 1 three-phase active energy meters in the national standard GB/T17215.321-2008 and the international standard IEC62053-21; It can directly and accurately measure positive active energy in energy metering, with a 7-digit LCD display showing functional electricity. It has the characteristics of good reliability, small size, light weight, beautiful appearance, advanced technology, and 35mm DIN standard rail installation. It also has good resistance to electromagnetic interference, low self consumption and energy saving, high precision, high overload, high stability, anti-theft, and long lifeRS485Communication, remote closing and opening functions.

Communication protocol

According to the Communication Protocol for Multi functional Energy MetersMulti-function watt-hour meter communication protocol》DL/T 645—In 1997DL/T 645-2007 Electric Power Industry Standard of the People's Republic of China shall be implemented.

This meter is suitable for measuring three-phase AC active energy with a rated frequency of 50Hz or 60Hz. For fixed installation indoors, suitable for ambient temperatures not exceeding -25~+55 ℃, relative humidity not exceeding 95%, and free of corrosive gases in the air, avoiding the influence of dust, mold, salt spray, condensation, insects, etc.

2. Main specifications and technical parameters

2.1 Specification of electric energy meter:

Note: In the rated current column, the value before parentheses is the calibrated current value Ib, and the value inside parentheses is the rated maximum current value Imax.

2.2 Technical Parameters

2.2.1 Error Limit:

Basic error limit of electric energy meter with balanced load

Basic error limit of electric energy meter with single-phase load

2.2.2 Start up

Under the conditions of rated voltage, rated frequency, and COS Φ=1, when the load current of the energy meter is the specified value in the table below, the energy meter can start and continuously measure electrical energy.

2.2.3 Submersion

When there is no current in the current circuit of the energy meter and the voltage applied to the voltage circuit is 115% of the rated value, the test output of the energy meter should not generate more than one pulse.

2.2.4 Insulation performance

All lines of the electric energy meter can withstand a pulse voltage with a waveform of 1.2//50 μ s and a peak value of 6KV between the casing, and can be tested continuously for 10 times at different polarities without arc discharge or breakdown. All circuits of the electric energy meter can withstand an actual sine waveform AC voltage of 2KV with a frequency of 50Hz between the watch case or the metal parts that can be touched outside the watch case, and the test lasts for one minute without breakdown.

2.2.5 Working voltage limit: 70~115% Ub

2.2.6 Power consumption: ≤ 2W and 10VA

2.2.7 Display

LCD display

2.2.8 Data Storage

Can be saved for 12 months, and after power failure, the data can be saved for at least 10 years.

3. Installation and use

3.1 Installation precautions and methods

Before leaving the factory, the electric energy meter must pass the inspection and be sealed with a lead seal before installation and use. Electric energy meters without lead seals or stored for too long should be re inspected by relevant departments before installation and use.

When the electric energy meter is taken out of the original packaging box, if damage is found to the inner packaging or outer shell, do not install or power on the meter. Please contact our technical service department

3.1.3 Experienced electricians or professionals are required to install the energy meter and ensure that they have read this manual thoroughly.

3.1.4 The electric energy meter should be installed in a ventilated and dry indoor area, using a 35mm DIN standard rail installation. The base plate for installing the electric energy meter should be fixed on a sturdy, fire-resistant, and vibration resistant wall.

3.1.5 In places with pollution and potential damage to the mechanism, the energy meter should be installed in a protective cabinet.

3.1.6 When installing wiring, follow the wiring diagram on the terminal cover of the electric energy meter or the corresponding wiring diagram in this manual. It is best to adapt to the introduction of multiple copper wires to avoid abnormal operation or burning of the electric energy meter due to poor contact.

3.2 Instructions for use

3.2.1 When using an electric energy meter in areas with frequent lightning strikes, lightning protection measures should be taken to avoid damaging the meter due to lightning strikes.

3.2.2 The load capacity of the electric energy meter is between 0.05 Ib~1max (direct connection type) or 0.02 Ib~1max (through transformer connection type). Exceeding this load capacity will result in inaccurate measurement of the electric energy meter or burning of the current coil due to heating.

3.2.3 When an electric energy meter is used with a transformer, that is, an electric energy meter connected through a current transformer must multiply its electric energy reading by the transformer multiplier to obtain the actual electricity consumption.

3.2.4 Data display: Use a 7-bit LCD display or a counter.

3.2.5 Power indication: When the three LED indicators L1, L2, and L3 are on, it indicates that the three-phase power supply is normal; When a certain phase voltage is missing, the corresponding voltage loss indicator light will turn off.

3.2.6 Pulse indication: When the PULSE indicator light is on, it indicates the detection of a power pulse (when there is a sampling signal, the pulse indicator light will light up for about 80ms)

3.2.9 LCD display types, as follows:

Total energy consumption NNNNN NN (5+2 format), for example, Figure 1: The total energy consumption value is 45748.91KWh

Figure 1

3.2.12 Attention:

Please check if all programming is correct before using the electricity meter