The design of electric power control system for oil-

pumping unit based on energy metering ADE7758

Han Shuxia1, Qu Wei, Qiu Cheng-jun2*

Science College of Northeast Forestry University, The Key Lab of Integrated Circuit of Heilongjiang
HarbinˈChinaˈ150040, University,
han_shx@163.com HarbinˈChinaˈ150080,

Abstract—In actual oil-producing wells, most oil-pumping units

are running in awful circumstance, and their location is II. THE DESCRIPTIONS AND FEATURES ABOUT ADE7758
irregularly, so the electric power control for the oil-pumping
units is difficulty. The electric power correlate data of the oil-
The ADE7758 configuration and function description is
pumping units will cost much time for the professional to collect.
Based on the analysis of actuality, an electric power control shown in Figure1, Table1 respectively. ADE7758 is a
system design is introduced according to the function and manufacture which is a sort of the function and character of
character of energy metering chip ADE7758, and the Energy Meter, it integrate the six second-order Ȉ-ǻA / D
microprocessor chip C8051 is also used in the circuit system. The converter with a high sampling rate, a digital integrator, a
advantages for the system are high accuracy, simple operation benchmark circuit, temperature sensors on chips, three-phase
and convenient for portable. active and reactive, and the RMS calculation about voltage
and current for all signal processing part[1,2]. ADE7758 has a
Keywords-component; formatting; style; styling; insert (key waveform sample register which allows accessing the output
words)
of ADC, through this feature that we will detect the power and
output in graphical way. In addition, users can set up the
I. INTRODUCTION threshold values, including monitor the line voltage falling,
Whether or not the oil-pumping unit operating well is over-voltage detection and over-current detection [3].
crucial in the oil field, it directly determines the economic
benefits to the oil production. With the development of the APCF 1 24 DOUT
DGND SCLK
internal economic restructuring, cost must be considered,
DVDD DIN
including the energy consumption and the working details of
AVDD CS
the every pumping. Whether above these have proper ADE7758
Verti cal
IAP CLKOUT
functioning in the energy-saving mode, but until now, we also Vi ew
IAN CLKIN
rely on artificial checking in short time but monitoring in 24-
IBP IRQ
hour. And under the extensive management circumstances, it
IBN VARCF
is very difficult to clear that: what is time when pumping and
ICP VAP
electrical motors stop working, and the electric consumption
ICN VBP
would be abnormal, such as the phenomenon of leaking
AGND VCP
electricity. Based on the analysis of this situation, this article REFIN/ OUT 12 13 VN
has designed a monitoring system that can monitor and record
the consumption and operation of motors with a non-contact
measurement, and it can cut off electrical motors when the Figure1. The configuration of ADE7758
malfunction happen. This is so easy that user can record the
data of each wells using hands-wireless terminals when they
Tab. 1 Important Pin’s function description
stand in the front of the oil-pumping, then input these data to
Pin Name Function Description
database in order to make tables, including the operating data,
1 APCF Active frequency output
the operation of working and un-working, finally analyses 3 DVDD Digital power
these data so that operator can realize whether there have the 4 AVDD The power of Simulation
unusual phenomenon. Considering the production of each oil 5,6,7, IAP,IAN,IBP Current channel analog input
well, in the cost- effectiveness, from the original data we will 8,9,10 IBN,ICP,ICN
be glad to know whether oil well need to cut off, so the 13,14,15,16 VN,VCP,VBP,VAP Voltage channel analog input
management is more scientific and higher. 17 VARCF Reactive power output frequency
22 DIN Serial interface data input
24 DOUT Serial interface data output

This work was sponsor by the New Century Education and Teaching Reform
Project of Heilongjiang Province (project code: 09A004).
*Contact Authors: email˖chiucj@163.com

978-1-4244-4994-1/09/$25.00 ©2009 IEEE

 III. DESIGN CONCEPTS AND PRINCIPLES FOR SYSTEM The collecting path of voltage information is Fig.3.
The process about system required completing the data ADE7758
♖ኒ
R⬉㒖 ⬉W
य़੕ᗵེ A
collection, processing, transmission and storage of the power VAP
16
15
consumption; secondly, depending on the mode of calculation, VBP
14
VCP
we should know all relevant parameters of the input signal; 13
VN B
finally, based on the measured parameters, the system will
monitor the power consumption of the pumping. This system ♖
should be an own system, but also must be connect computer ኒ
with other departments management in order to manage at ⬉ C
network. Therefore, the design process must have the 㒖
reliability, accuracy, security, and openness principles. The
original data must be accurate and in line with the N
corresponding measurement standards and technical
specifications, it is meaning that data errors must ensure
Fig.3 The collecting path of voltage information
accuracy in the range. In addition, monitoring systems are often
involved a number of different production stations, a similar
products with different versions of the system may be used Fig.4 is the collecting path of current information.
monitoring, which requires communication protocol and
,D
interface to comply with international standards and the trend ,$
of technological development in order to adapt to different
P$ ,E
application environments and requirements[4].
,F
IV. SYSTEM DESIGN ,%
,Q ADE7758
P$ 5
IAP
A. Hardware design for System 6
IAN
7
The block diagram of hardware is shown in Figure 2. 8
IBP
IBN
9
,& 10
ICP
B. Subordinate computer system design P$
ICN

The frame of subordinate computer system includes special

energy metering chip, such as ADE7758, C8051, and
communications moduleMAX487. In the ADE7758, trough the
voltage conversion and current transformer to collect the three- ᵈ䰆 ♖ኒ⬉㒖
phase voltage and current signal for power consumption, then
processing by the DSP, convert into corresponding electrical Fig.4 The collecting path of current information
signals, and transport signals through the SPI interface to the
Fig.5 is the interface circuit between ADE7758 and
C8051, these signals will be storage in C8051. So the action of
C8051.
ADE7758 is controlled by C8051. C8051 communicates with
9
the host computer through the RS485 interfaces, and complete
3



the exchange of data collection [5, 6]. 
..
..
..
..
..
..
C8051
.
.

.. .. ..
ADE7758 .. .. ..
3
3
      
      

Input vol tage and current 

3

24
DOUT
23 
3

SCLK
22 
3

DIN
The circuit of voltage 21 
3

The circuit of current CS

.. .. .. 
3

.. .. ..
.. .. . 
3

18
IRQ 
3

ADE7758 
3



.
.

SPI interface 

Store module C8051 communication module

The communication ofprincipal
computer

The communication of
9
RS485 interface subordinate computer Fig.5 The interface circuit between ADE7758 and C8051
Store module communication module
C8051 C. Host computer system design
Display module Keyboard module Host computer also uses the high performance C8051 as
the master chip, and it communicate with the under machine
through the RS485 interface to implement the two-way digital
Fig.2 The block diagram of hardware communications, and complete data reception and control the
functions of subordinate computer.[5,6] The host databases
Start
communicate with computer through the RS485 interface in
database. It is easy that host computer also is equipped with a System Initialization
128 × 64 dot matrix LCD and 6 keys keyboard for the operator. Power-time record
The interface circuit between C8051, LCD and keyboard is
Unit works NO
shown in Figure 6[7].

/
&
'
B



[


/
&
'
B
G
D
W
D
3



The state of unit


3
3



3


'
%
 :  ,B

'
%

C8051 Processing YES

3




(
1
 Whether link

3


(5
¡¤¡¤¡¤ instructions

3




&
6:

3


&
3




5

9  YES
'
Stop Record time

6&
3




&
6 (
'1 

6'
3




 YES
'
*
'    

:
Record time Faulting

3




/
 ',
3
 

/
(
 Stop state
3 3

 Fault protection Deal with



YES
 YES Whether link orders
33 

 Record state
 

Fault protection
 Being fault YES Record time
3

 Record state of halting

3

Relay work
 currently
 ' Record state currently


'
'1





33339*
'3333333
Record time YES Whether unit NO
of halting start















. 9
.
.
.
. Fig.7 The main flow chart of subordinate computer
.
Software use modular design, and it can execute signal
sampling and processing for the voltage and current sensor,
5,*7
/()7
':21
2.

83
(6&

and it can measure three-phase voltage, current, active power,

Fig.6 The interface circuit between C8051, LCD and keyboard
reactive power, power factor and so on. Using single-chip
microcomputer to control the data transmission, it can improve
D. software design for system real-time systems. To ensure the running speed about system,
Modular design methods are used in System software for the editing and experimental data, which will be stored in
design, including the data collection of subordinate computer, local databases, but for the complete data, we should store in
running and communication software, and display software the database server to ensure data security through the
about host computer. communication ports. At the same time we need monitor the
operational status of unit and determine the type of
E. Data collection and processing software in subordinate interruption and action.
computer
The main flow chart of subordinate computer is Fig 7. F. Data processing and control software of principal
computer
When principal computer receive a signal, which order to
stop working, it receive the data from subordinate computer
and store in local memory, in accordance with the operation of
the operator to complete the relevant contents. Fig 8 is the
main flow chart of principal computer.

Start

System initialization

Waiting for tasks

Saving Showing Deal with Scaning

data orders keyboard

Fig.8 The main flow chart of principal computer

 V. CONCLUSION
In this paper, based on the ADE7758 power monitoring
system about oil-pumping units has real-time monitoring,
controlling, and transmission system with high-precision
multi-function. This system also has powerful human-
computer dialogue features and can be used at bad working
environment, so the market outlook is more optimistic and this
system has a high practical value.
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Calculation [Z].2005.
[2] Analog Devices .ADE7758 Datasheet Poly Phase Multifunction Energy
Metering IC With Per Phase Information ANALOG DEVICES [Z],2005.
[3] Poly Phase Multifunction Energy Metering IC with Per Phase
Information [Z]. ANALOG DEVICES. 2004.
[4] Ye ning, Peng jishen. Design of multi-function power meter with
ADE7758 [J]. Electronic Technology in Chinese. 2005, 5: 11㧙13.
[5] Doxinyu, Li xinchun, Wang zhanguo. The applications of Energy
Metering IC ADE7758 chip[J]. Electronic Instrumentation Customer in
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[6] Wang Wenjun. Design of Power Grid Measurement System about
Wind-power Generator Based on ADE7758. Programmable Controller
& Factory Automation in Chinese [z].2008,11
[7] Jiang Yanyan.Application of ADE 7758 in Microcomputer Relay
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[z].2008,9