1. Usage, Characteristic and accommodation

In accordance with standard of GB/T17215 and GB/T8382, the three phase prepaid kilowatt hour meter (hereinafter to meter) is adapt to the advanced single chip processing system to collect, process and conserve and its usage is measuring the three phase active power with Rated Frequency of 50HZ.

The main characteristic: execute the computer management, Purchase the electricity before using, which can limit the maximum using power (limited by power supply department) One card for one meter, special card for special use, loss the card without losing the electricity and can reuse buying another card. The electrical card can transmit the data in two ways. It can cut off the electricity and warn the customer of purchasing electricity. It will be cut off automatically when the power is zero. It has the certainly anti-steal software designs.

This meter is adapt to -25℃~+55℃of the environment temperature and no more than 85% of relative humidity.

2. Specification and technical target

2.1 Specification

2.2 Basic error (the maximum of balance load error)

Note:(Ib rated current Imax maximum current)

2.3 Starting

In the condition of referenced voltage, referenced frequency and Cosø equal to 1.0, the meter can go on measuring the electric quantity with load current of 0.004Ib(class1)、0.005Ib(class2).

2.4 No-load Starting

The tested output of meter should not be generated more than one impulse when imposing 115% on the voltage circuit and no electricity in the current line.

2.5 The scope of voltage

Normal work voltage: 0.9Un-1.1Un

Maximum work voltage: 0.8Un-1.15Un

2.6 Power loss

Power loss of voltage circuitry: ≦2w and 10VA

Power loss of current circuitry: ≦4.0VA

3.The main structure and work principle

Type DTSY855series three phase pre-paid kilowatt hour meter is adopt to special large scale integrated circuit from importing and digital sampling process technology and new type meter of SMT techniques, which is sixteen in digital, AD Transfer, Digital multiplier unit.

3.1The diagram of work principle

Getting the voltage sampling signal and current sampling signal through regulation resistance and current inter-induction, the kilowatt hour meter receive the multiply signal via digital multiplier unit then generate the count impulse which the frequency and the multiply of current and voltage are in the direct proportion via the transfer of frequency. It can drive the electric motor to measure the electric quantity through demultiply.

3.2 Data processing

Electric power measurement impulse is processed by CPU through photocoupler, and then stored in the EEPROM not easy to loss after calculating. With the computer management information system, IC card of certain electrical quantity and monitor required is read to micro-processing system inside the meter through the IC reader and then it provide showing, alarm and the signal of cut offafter the calculating of CPU.

4. Installment and usage

4.1 The meter can be installed and used with the sealing through the test before leaving the factory .If no sealing or store too long ,it can be usage through retested and resealed by the relative department.

4.2 The meter should be vertical and not slope to install in the dry and winding place which its height is nearly 1.8m. The base should be fixed in the firm, anti-fire and unshakable wall.

4.3 Connection according to the diagram and screw tight the connecting screw and screw the connecting board in the terminal.

4.4 The red window in the nameplate stands for decimal and the black is integer. The practical electrical quantity of meter which connect through inter-induction is the showing multiply the various proportion.

4.5 The customer should put the card to car reader once so as to send the data inside the meter back to computer database. Before purchasing the electricity.

4.6 We put the card into the car reader and operate the computer at the same time to make the customer code, the electrical quantity buyed, limited capacity and limited power read into the card with a password.

4.7 Put the card into the car reader when using. If it is a valid card, the meter read the data automatically and the database show the remanent electrical quantity (three seconds) and plus general electrical quantity(twelve seconds), then take the card and protect the card safely.

4.8 If the customer wants to know the remanent electrical quantity, it can be shown by put the card. When the meter is processing.

4.9 If the monitor shows the remanent electrical quantity and the indicator light of beyond capacity illumes at the same time, it warns the customer of using the electricity beyond the capacity when the meter is processing. If the customer is set to cut off when beyond the capacity(the indicator light of limited capacity illumes), it will be cut off for three minutes after twinkling showing the remanent electrical quantity in 30 seconds and count down showing the time of recovering supplying the power. If the meter is response to put into the car reader, it will be supplied by power at once.

4.10 If beyond the electrical quantity (the purchasing electrical quantity +remanent electrical quantity>10000kwh), the purchasing electrical quantity will not be read ,monitor just show PO=F(3 seconds) and original remanent electrical quantity(12 seconds)and the electrical quantity inside the meter is also valid.

4.11 The card owned by the customer cannot exchange, which one card for one meter, and it has to go to the power department to buy another card when missing.

4.12 The meter is cut off and warned and the indicator light illume when the remanent electrical quantity is 10% of this purchasing electrical quantity. It will be recovered by supplying power when put the card into the car reader .If can’t find the card for this meter when it is cut off, it can use the neighbor’s card instead of our meter to recover the power.

4.13 If the meter is continual to work and force the indicator light to illume when the remanent electrical quantity is zero, the user should buy the electricity at once and tell the truth to the power department.

5. External dimensions:

6.Connection diagram of function terminal

7. Connection diagram of electric power source

7.1 Connection diagram of three phases four wires through inter-induction

7.2 Direct connection diagram of three phases four wires

8.The time of guarantee