JIANGSU Sfere720A User manual

Multi-function Power Meter
User Manual
Applied to:
Sfere720A
Sfere720B
JIANGSU SFERE ELECTRIC CO., LTD.

Safety instructions
Dangerous voltage!
Danger to life or risk of serious injury. Disconnect system
and device from power supply before beginning work.
Caution:
Please follow the documentation. This symbol warns of
possible danger that can arise during installation,
commissioning work.
CAUTION:
◆Make sure only the qualified technicians perform the installation and
maintenance;
◆Before performing wiring operation to the meter, make sure the CT input signal
and the power supply are switched off;
◆The electrical parameters supplied should be within the rated range;
The following situations may result in damages to the meter or cause mistakes in
the operation of the meter.
◆The voltage of the auxiliary power supply goes beyond the rated range.
◆The frequency of the power distribution system goes beyond the rated range.
◆The input polarity of the voltage or the current is incorrect.
◆Remove or connect the communication plugs without powering off.
◆Wrongly connected the signal terminal wires to power supply source.
Please don’t touch the rear terminals when the meter
is in operation!

Content
1. Product description.....................................................................................1
1.1 Compliance with standards.................................................................. 1
1.2 General................................................................................................. 1
1.3 Model selection.................................................................................... 2
2. Technical parameters.................................................................................. 3
2.1 Technical specification.......................................................................... 3
2.2 Function parameters............................................................................ 5
3. Installation and wiring................................................................................ 6
3.1 Meter dimensions.................................................................................6
3.2 Installation method.............................................................................. 6
3.3 Functions of wiring terminals............................................................... 7
3.4 Signal input wiring diagram.................................................................. 9
4. Display.......................................................................................................10
4.1 Panel description................................................................................ 10
4.2 Electrical variables display.................................................................. 10
4.2.1 Electrical variables display...........................................................11
4.2.2 Energy display..............................................................................15
4.2.3 Spare energy display....................................................................16
4.2.4 Harmonics display pages............................................................. 18
4.2.5 Demand value display pages....................................................... 20
4.2.6 Extreme value display..................................................................21
4.2.7 Tariff energy display pages.......................................................... 22
4.2.8 Time display.................................................................................27
4.3 Operation instruction for keys on panel.............................................27
4.3.1 Parameter setting menu structure.............................................. 29
4.3.2 System setting............................................................................. 32

4.3.3 Signal input setting...................................................................... 33
4.3.4 Communication setting............................................................... 34
4.3.5 Relay output setting.................................................................... 35
5. Communication.........................................................................................36
6. Extended function.....................................................................................36
6.1 Energy pulse output........................................................................... 36
6.2 Digital input........................................................................................ 37
6.3 Relay output....................................................................................... 37
6.4 Max./Min. value demand................................................................... 39
6.5 Event recording...................................................................................40
7. Common problems and troubleshooting................................................. 40
7.1 About communication........................................................................ 40
7.2 Measurements about U, I and P are incorrect................................... 41
7.3 About incorrect power running.......................................................... 41
7.4 Meter does not work.......................................................................... 42
7.5 The meter does not respond to any operation.................................. 42
7.6 Other abnormal phenomena..............................................................42

1
1. Product description
1.1 Compliance with standards
International standards
IEC62053-22:2003 Electricity metering equipment (a.c.)-Particular
requirements-Part 22: Static meters for active energy (classes 0,2S and 0,5S).
IEC62053-23:2003 Electricity metering equipment (a.c.)-Particular
requirements-Part 23: Static meters for reactive energy (classes 2 and 3).
IEC61010-1:2001 Safety requirements for electrical equipment for measurement,
control, and laboratory use – Part 1: General requirements.
IEC 61000-2-11 Electromagnetic compatibility (EMC)- Part 2-11
IEC60068-2-30 Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12h+12h cycle)
1.2 General
SFERE720A/B multi-function power meters can measure voltage, current,
frequency, power, power factor, energy, harmonics and demand, record SOE events,
and realize off-limit alarm. They also have the functions such as communication,
digital input, relay output and energy pulse output. As an advanced smart digital
front-end acquisition components for grid, they are widely applied in many kinds of
control systems, energy management systems, substation automation systems,
power distribution automation systems, smart distributors and switch cabinets.
This series of products provide many wiring methods and convenient operation
methods which can meet different requirements at field.

2
1.3 Model selection
SFERE720A
SFERE720B
Appearance
and accuracy
Display mode
LCD
LCD
Installation mode
Panel
mounting
Panel
mounting
Active energy accuracy
0.5S
0.5S
Reactive energy accuracy
2S
2S
Real-time
measurement
U/I/P/Q/S/PF/F
▇
▇
Demand
▇
▇
Neutral current
-
▇
Energy
metering
Bi-directional energy
▇
▇
Four-quadrant reactive energy
▇
▇
Spare energy
-
▇
Tariff energy
-
▇
Power quality
Voltage/current THD
-
▇
Sub-harmonic content
-
2nd - 51st
Sequence component and phase
position of voltage and current
-
▇
Voltage and current unbalance
-
▇
Crest factor, current K factor
-
▇
Data record
Meter/load running time
▇
▇
Demand/max./min. Value record
-
▇
Off-limit record
-
▇
SOE event record
-
▇
Input and
output
Energy pulse output
▇
▇
RS485 communication interface
▇
▇
Digital input
-
▇
Relay output
-
▇
Note: ▇Yes;
— No

3
2. Technical parameters
2.1 Technical specification
Working environment
Working temperature
-10°C to 55°C
Storage temperature
-25°C to 70°C
Relative humidity
≤95% RH, no condensation
Working altitude
≤2500m
Protection degree
Front case IP64, rear case IP20.
Insulation
Between signal, power supply, output terminal to case
resistance >100MΩ
Working power supply
Rated range
AC/DC（20～300）V
Power consumption
≤5VA
Withstand voltage
≥2kV
Voltage input
Rated range
230V/400V（continuous: 1.2Un）
Resolution
0.1 V
Impedance
1.6 MΩ/per phase
Power consumption
≤0.1 VA /per phase
Over voltage
Instantaneous：2 times/10s
Frequency
45-65 Hz
Current input
Range
5A/1A, (continuous: 1.2In)
Resolution
1 mA
Impedance
≤20mΩ/per phase
Power consumption
≤0.2 VA/per phase
Over current
Instantaneous：10 times/5s
Relay output
Capacity
5A/250 VAC; 5A/30 VDC

4
Isolation voltage
Between contact and coil: 2000 VAC / min
Action time
10 ms max
Release time
5 ms max
Mechanical service life
106times
Energy pulse output
Pulse width
80ms±20%
Max. terminal voltage
35V
Max. terminal current
10mA
Pulse frequency
≤10Hz
Digital input
Sensitivity
ON:140～270V AC, OFF: <110 V AC
Isolation voltage
5000 VAC (1 min)
Scanning time
1 ms
Wave filtering time
30 ms
Communication interface
Physical interface
RS-485
Communication speed
Up to 115.2 kbps
Communication protocol
Modbus-RTU
Isolation voltage
2000 VAC (1 min)
Real-time clock
Error
≤0.5s/day
Electromagnetic compatibility
Electrostatic discharge immunity: IEC 61000-4-2-III
Radiated, radio-frequency, electromagnetic field immunity: IEC 61000-4-3-III
Electrical fast transient/burst immunity: IEC 61000-4-4-IV
Surge immunity: IEC 61000-4-5-IV
Immunity to conducted disturbances, induced by radio-frequency fields: IEC 61000-4-6-III
Power frequency magnetic field immunity: IEC 61000-4-8-III
Voltage dips, short interruptions and voltage variations immunity: IEC 61000-4-11-III

5
2.2 Function parameters
Functions
Sign
Accuracy
Range
Display range
Voltage
U
0.5
10--380 V
0--999.9 kV
Current
I
0.5
0--5 A
0--99.99 kA
Active power
P
0.5
0—5.7 kW
0--9999 MW
Reactive power
Q
0.5
0—5.7 kvar
0--9999 Mvar
Apparent power
S
0.5
0—5.7 kVA
0--9999 MVA
Power factor
PF
0.5
0--1.00
0--1.000
Frequency
F
±0.01Hz
45--65 Hz
45.00Hz-65.00 Hz
Active energy
EP
0.5s
--
0--99999999 MWh
Reactive energy
EQ
2
--
0--99999999 Mvarh
Voltage THD
THDu
Class A
51
0--99.99 %
Current THD
THDi
Class A
51
0--99.9 9%
Voltage sub-harmonic
content
HRUh
Class A
51
0--99.99 %
Current sub-harmonic
content
HRIh
Class A
51
0--99.99 %
Voltage unbalance
Uunb
Class B
--
--
Current unbalance
Iunb
Class B
--
--
Voltage sequence
component
U1, U2, U0
0.5
--
--
Voltage phase position
θU L1,θU L2,
θU L3
±0.1°
Current sequence
component
I1, I2, I0
0.5
--
--
Current phase position
θI L1, θI L2 ,θI L3
±0.1°
Extreme value
Max/Min
0.5
--
--
Demand
--
0.5
--
--

6
3. Installation and wiring
3.1 Meter dimensions
7.5 50.5
10(m ax)
□96
90
90
Picture 3-1 Meter dimensions
3.2 Installation method
Picture 3-2 Front view Picture 3-3 Back view