AC active energy watt-hour meters electronic Mercury 201

Description

The operating principle of electronic AC active energy watt-hour meters "Mercury 201" is based on taking into account information received from the pulse output of the measuring microcircuit. The meters use a shunt connected in series with the current circuit as current sensors. Resistive dividers connected to a parallel voltage circuit are used as voltage sensors.

As a counting mechanism, the meters have electromechanical readout devices (CD) or liquid crystal indicators (LCD) according to Table 1.

Meters with UO provide information display in the form of six-digit numbers, the five highest digits give readings in kWh, the sixth digit indicates the value of electricity in tenths and hundredths of kWh.

Meters with LCDs provide cumulative display of energy consumption in the form of eight-digit numbers, the six highest digits give readings in kWh, the two lowest ones indicate tenths and hundredths of kWh.

The meters have a light indication of power consumption. The flickering period of the indicator light is proportional to the level of energy consumption.

The meters have an electrical or optical pulse output as a test output device.

Meters can be used autonomously or in automated systems for collecting and recording information about consumed electricity.

Electronic watt-hour meters of active energy of alternating current "Mercury 201" consist of the following components:

— housing (case base, housing cover, terminal cover);

— terminal block;

— printed circuit assembly.

The printed circuit assembly is a board with electronic components that is installed at the base of the housing. The printed circuit board is connected to the terminal block using wires.

The housing cover is attached to the base with latches and one or two screws (depending on the modification) and has a window for reading readings from the LCD (LC) and for observing the LED operation indicator.

The terminal block consists of four terminals for connecting the mains and load.

On the printed circuit there are:

- power unit;

— pulse output optocoupler;

— microcontroller (MK);

— non-volatile storage device;

- LCD (UO).

The meters are designed for use indoors.

The degree of protection of meters against penetration of dust and water is IP51.

Electronic watt-hour meters of active energy of alternating current "Mercury 201" have several versions, differing:

— base and maximum current;

— accuracy class;

— counter constant;

— a device for displaying metered electricity;

— the presence of an electrical or optical test output;

— functionality;

— climatic design;

- type of housing.

Options for meter designs are shown in Table 1.

Table 1 - Meter options

UO - electromechanical readout device,

LCD - liquid crystal indicator,

PLC is a modem module for transmitting information over a power network.

A general view of electronic AC active energy watt-hour meters "Mercury 201", manufactured in different housings, is presented in Figures 1 - 4.

The sealing diagram against unauthorized access and the designation of the place where the verification mark is applied are presented in Figures 5, 6.

Figure 4

The verification mark is applied by pressure to a hinged seal or special mastic.

Design features and connection diagram

The device consists of a plastic case, a cover, a terminal block, an optocoupler, a volatile memory device, an optoport, a microprocessor and a liquid crystal monitor. There are two connection options. Can be connected directly or semi-indirectly using current three-phase transformer installations. As for direct connection, the device is connected directly to the power line according to the instructions using input machines.

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Note! As for semi-indirect connection and installation, this circuit uses a phase network conductor. It is worth pointing out that there is also an autotransformer, indicated in the diagram.

Mercury connection 201

Specifications

Table 3 - Metrological characteristics

Table 4 - Main technical characteristics

Counter MERCURY 201.8 TLO

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CATALOG OF MERCURY COUNTERS

FEATURES OF THE ELECTRICITY METER MERCURY 201.8 TLO

Measurement, accounting, storage, output to LCD and transmission via interfaces of active and reactive electricity separately for each tariff and the amount for all tariffs for the following periods of time:

• energy from resetting the readings;
• energy at the beginning of the current and 180 previous days;
• energy at the beginning of the current and 48 previous months.

Tariff with the ability to set a separate schedule for each day of the week at 4 tariffs in 16 time zones of the day. Each month of the year is programmed with an individual tariff schedule. Measuring electrical network parameters:

• instantaneous values ​​of active, reactive and apparent power;
• effective values ​​of current and voltage;
• network frequency;
• Power factor.

Power profile with averaging time of 30 minutes and storage depth of 6 months.

Recording maximum current, voltage, active and reactive power. Maintaining event logs. Automatic self-diagnosis with error indication. Availability of a built-in 80 A relay. Non-volatile electronic seal. Recording unauthorized actions in permanent event logs. Indication of parameters on the LCD when the power is off. Absence of magnetically sensitive elements in the measuring circuits and power supply system. Compact housing with DIN rail mounting.

The counters are displayed on the LCD indicator:

• current tariff number (TARIFF 1…4) and amount;
• the value of consumed energy of each type from the beginning of operation for each tariff and the amount for all tariffs;
• current value of active and reactive power in the load and their maximums;
• current current and voltage values ​​and their maximums;
• power and energy limit;
• exceeding the power limit;
• the value of energy consumed from the beginning of operation on the first day of the current month and each of the previous 11 months for each tariff and the amount for all tariffs;
• time of switching tariff zones for the current day;
• time and date;
• operating time from the moment the meter was put into operation;
• battery operating time;
• indicator of disconnected relay;
• reverse current indicator.

METROLOGICAL CHARACTERISTICS OF MERCURY 201.8 TLO

TECHNICAL SPECIFICATIONS MERCURY 201.8 TLO

LEGEND MERCURY 201.8 TLO

T – internal tariff, electronic seals; L – PLC-II modem; О – built-in power relay for load control.

DIMENSIONAL DRAWING OF THE METER MERCURY 201.8 TLO

Completeness

Table 5 — Completeness of meters

Verification

carried out in accordance with GOST 8.584-2004 “Static active electrical energy meters of alternating current. Verification methodology."

Basic means of verification:

Working standard of the 2nd category according to GOST 8.551-2013, installation for checking electric energy meters automated UAPS-1M, registration number in the Federal Information Fund No. 23832-07 (rated voltage 230 V, main operating current range (0.01-100) A, active energy measurement error ±0.15%).

It is allowed to use similar verification tools that ensure the determination of the metrological characteristics of the meters being verified with the required accuracy.

The verification mark is applied by pressure to a special mastic or hinged seal, which is located at the point where the casing is attached to the base of the meter.

Basic and additional characteristics

There are differences in the technical characteristics of the device depending on the model, but the common feature for meters of the 201 series is accuracy class 1. This meets the requirements of regulatory documents (no more than 2) and indicates a small measurement error. The device is protected by a polarity reversal system from the possibility of external influence on its operation. You cannot stop the device or affect the accuracy of the data.

• rated network voltage - 230 V;
• rated current - 5(60) - 10(80) A;
• sensitivity threshold - 10/20/40 mA;
• temperature range within -40…+75⁰С;
• weight - 0.25 (0.35) kg.

• service life - 30 years;
• The warranty period is 3 years.