The remote meter reading system mainly completes three tasks: electricity measurement or information collection, information remote transmission, background software processing and analysis. These two technologies are mature, and the key technology of meter reading system is to solve the problem of information remote transmission-communication.

Power frequency distortion cross-substation remote meter reading system, with the help of distribution network (10KV and 380KV lines) as transmission channels, utilizes the characteristics that information can be directly transmitted from user nodes (380V) to substations, and summarizes a large number of scattered node communications extending to all corners of power supply to one point of substation communication, which is economical and practical.

Second, the system characteristics

Make full use of the existing power network as the transmission carrier, do not need additional system equipment, have no special requirements for the existing system, have simple construction and save a lot of expenses.

The signal has no leakage and little attenuation during transmission, and there is no need for filters and wave arresters.

Cross-platform communication can be realized without switching equipment, which reduces geographical restrictions.

Realize two-way communication, directly access remote equipment or instruments, and do not need relay links.

There is no interference to the power grid itself, which is completely within the allowable range.

It is insensitive to the frequency and amplitude changes of the power grid itself and has strong anti-interference ability.

When the signal is modulated near zero, the required modulation power is small and easy to realize.

Automatic meter reading when the power frequency distortion of distribution network crosses the station area has the characteristics of low cost, high transmission reliability, no need for additional equipment and no need to transform the distribution network, which is especially suitable for China's national conditions.

Third, comprehensive functions.

Household electricity meter management: automatic electricity meter reading, automatic power failure due to arrears, and voltage qualification rate monitoring.

Station area meter management: the power of active and reactive meters in the station area and all functional parameters in the 485 interface table in the station area are automatically copied.

Line loss management: The background software can instruct to freeze all parameters of the selected meter at the same time, and make statistics on low-voltage line loss, 10KV line loss and comprehensive loss of the substation.

Power supply and sales management: background software can instruct to freeze all parameters of the selected meters at the same time, and make statistics on power supply and sales of stations, lines and substations.

Automatic power-off due to arrears: users who owe arrears can use the relay of the module to automatically power off.

Voltage qualification rate and quality detection: the voltage quality monitoring of user points is completed by using the voltage monitoring function of the module.

Multi-point management: The master station is equipped with a modem, which can be set in electric power management departments, manufacturers, superior competent units and other places for multi-point online management as a subsystem of information management.

For users who supply power hand in hand, the power supply of different power sources can be measured separately.

Home extension services: automatic management of water meters and gas meters, remote control of air conditioners and other equipment.

Municipal extension services: automatic management of street lamps and fire fighting.

Oil field extension service: automatic control and management of tadpole machine in oil field.

Distribution automation communication platform: automatic management of switches, capacitors and other equipment.

Four. Introduction and description of series products

The meter reading system series products are mainly divided into two categories, one is the main station part, and the other is the module terminal part.

1, main station part

(1)ZZ-2000-X:ZZ- main station; 2000- managed 2,000 electric meters, generally used in the meter management system in Taiwan Province; X- represents the number of bus sections, and can manage at most two bus sections running independently.

(2)ZZ- 100000-X:ZZ- main station; 100000- Manage 100000 household tables, which are generally used to manage the simultaneous interpretation system of residential stations. X- Same as above.

(3)ZZ-xq:ZZ- master station; XQ-community management. This type of master station is generally used for residential property management. Installed at the low-voltage end of the residential power supply system or the property management office. The master station is equipped with 232 or 485 interface to manage electricity, gas, water and fire protection in the community.

2. Module part

(1)ccz-m-x:c- system number, c- terminal, z- carrier, m- pulse, number of x- pulse paths in the range of 1-8. A terminal can read up to eight pulse tables at the same time.

(2)CCZ-485:485- stands for intelligent interface, such as intelligent 485 meter, RTU with RS232/485 interface or comprehensive tester. It can read all the data in the intelligent interface unit, such as U, I, P, Q, cosφφ, active power and reactive power. Users need to provide the communication protocol of intelligent interface devices for communication.

(3)CCZ-J:CCZ- ditto, J relay output, can be used for power failure or remote control, user power supply, air conditioning control, 10KV switch control, 380V contactor switching, etc. Generally, a module only provides one relay output relay node. The node capacity is AC5A/220V, which should be customized to provide greater output capacity.

(4)CCZ-U:CCZ- ditto, U voltage detection function, which can monitor the voltage qualification rate, extreme value and power outage times of a phase voltage.

Description: If mixed functions are needed, such as CCZ-M-X, and voltage monitoring function is also needed, which should be specified in detail when ordering, then the model is CCZ-M-X-U, and generally three functions are combined at most; The 485 function is generally selected when selecting, and it is best not to combine the pulse metering function.