Test Equipments for Electrical Energy Meters
We design and manufacture test equipments and automation solutions for
calibration, type testing and production of electrical energy meters as per
IEC 62053, IS 14697, IS 13779, SASO 1823 & other harmonised standards.
Some of our recent solutions are listed here. Please write to us for more details.
This is a PC based system which facilitaltes to calibrate number
of meters at a time e.g. 5, 10, 20, 40, 60 or 80 resulting in
speedy testing. Different Systems are available for single phase as well as three phase electrical energy meters.
The entire test sequence is programmed and is controlled by customisable
Testware running on PC. The operator has to select the type of energy meter
(model or SAP code) to
be tested once on starting the bench, and then just load the energy meters in the jigs (electro-pneumatic
fixtures).
The accompanying PC based Testware is intuitive, has secured database and exports reports easily for statistical analysis such as pareto analysis, bell-curve etc.
MAIN FEATURES AT A GLANCE:
- Calibrates eighty meters at a time.
- Specially designed jigs for ease and operator safety (can be
integrated on an automated assembly).
- Does not require skilled operator.
- Reporting for Data Analysis.
The bench comprises of:
- Power Source.
- Micro-controller based error calculation module.
- Sensors at each station.
- Reference meter.
- PC with software for control & reporting.
- The power source has:
- Voltage Source adjustable from 0-300V with static phase shifting
arrangement to obtain 90° lead to 90° lag through unity. It
allows creep test as it can be adjusted from 70% to 120% of set
voltage.
- Current Source is adjustable from 0.01 to 100A
- For measurement, there are digital voltmeter, digital ammeter,
digital power factor meter and digital line frequency meter.
This is another option for testing electrical contactors manually.
The tests that can be performed are:
- Full-range accuracy check.
- Starting current Test.
- No Load (creep) Test.
- Repeatability of accuracy Test.
- Meter constant Test.
- Dosage Test.
The bench comprises of:
- Power Source.
- Micro-controller based error calculation module.
- Sensors at each station.
- Reference meter.
- PC with software for control & reporting.
Short-time Over-current Test Equipment is used to measure and analyze
the influence of short-time overcurrents on energy meter. This test is
described in various standards for energy meters such as IEC 62053, IS
13779.
As per IEC / CEI 62053, short-time 'overcurrents' shall not damage the
meter. The meter shall perform correctly when back to its initial working
condition and the variation of error will not exceed particular values
specified in the standard on basis of the class of the energy meter.
The Short-time Over current Test Equipment is suitable for testing the
influence of Short-time over-currents on all types of energy meters that
should confirm to or exceed the requirements of national and international
standards. STOC 01/02 is appropriate for use by test laboratories, research
& development centers & manufacturers for conformity assessment services,
research and type testing. This test is mandatory for electronic and
electromechanical energy meters supplied to energy distribution companies.
The STOC 01/02 briefly consists of a power circuit and a control panel. The
power circuit feeds the ‘overcurrent’ to the meter. The control panel provides
the user interface to adjust the parameters as per the requirements of the
standards and the meter.
The user can set the exact time duration or number of cycles on the control
panel for which the required current value is to be fed to the energy meter.
Specifications of the available models
| # |
Aspect |
STOC 1 |
STOC 2 |
| |
|
|
|
| 1 |
Input Supply |
Default: Three
phase, 415V, 50Hz, +/- 10%, (40A max)
(Adjusted as per client’s national standard) |
Default: Three
phase, 415V, 50Hz, +/- 10%, (100A max)
(Adjusted as per client’s national standard) |
| 2 |
Output Current Range |
50 to 5000A variable, controlled, settable and isolated from mains
Two Ranges:
50-500A
100-5000A |
100 to 10000A variable, controlled, settable and isolated from mains
Two Ranges:
100 – 1000A
200 – 10000A |
| 3 |
Output Current
Setting |
150A to 500A :
10ms
Above 500A : 500ms |
200A to 1000A :
10ms
Above 1000A : 500ms |
| 4 |
Compliance Voltage |
5V |
7V |
| 5 |
Output Measurement |
Through Transient Recording Meter; Facility is provided to connect
an oscilloscope to measure and set the desired output current.
Two ranges provided:
0 – 300mV for 0 – 500A O/P Tap
0 – 300mV for 0 – 5000A O/P Tapd |
Through Transient Recording Meter; Facility is provided to connect
an oscilloscope to measure and set the desired output current.
Two ranges provided:
0 – 300mV for 0 – 1000A O/P Tap
0 – 300mV for 0 – 10000A O/P Tap |
| 6 |
Time Setting
Cycle Setting |
10ms to 1000ms
1 cycle / 99 cycles |
10ms to 1000ms
1 cycle / 99 cycles |
| 7 |
Protection |
Fuse protection on primary side.
Electronic Over Current Protection in Primary Circuit.
Additional Time Limit for “Test ON” time. |
Fuse protection on primary side.
Electronic Over Current Protection in Primary Circuit.
Additional Time Limit for “Test ON” time. |
| 8 |
Termination |
Output current termination on bus bars to facilitate easy connection
with Energy Meter current circuit terminals.
Three bus bar, Common, 500A & 5000A are provided. |
Output current termination on bus bars to facilitate easy connection
with Energy Meter current circuit terminals.
Three bus bar, Common, 1000A & 10000A are provided. |
| 9 |
Current Sensing |
Through
Shunt:
0 – 300mV for 0 – 500A Output.
0 – 300mV for 0 – 5000A Output. |
Through Shunt:
0 – 300mV for 0 – 1000A Output.
0 – 300mV for 0 – 10000A Output. |
Influence of Supply Voltage Test Equipment ‘ISVT 01’ is used to measure
and analyze the influence of supply voltage on energy meter. This test is
described in various standards for energy meters such as IS 13779, IEC 62053
etc.
As per IEC 62053-21, IS 13779 clause 12.7.2, the test should be carried out
under the following conditions:
- Meter in operating condition
- Voltage and auxiliary circuits energized with reference voltage
- Without any current in the current circuits
In accordance with IS 13779 clause 12.7.2 & IEC 62053-21, this test
equipment will perform:
-
Voltage Interruption of 100%: On pushing button 'A', the test will
be as follows:
- Interruption time : 1s
- Number of interruptions: 3
- Restoring time between interruptions : 50 ms
- Voltage Interruption of 100%: On pushing button 'B',
the test will be as follows:
- Interruption time: 20ms
- Number of interruptions: 1
- Voltage Interruption of 50%: On pushing button 'C',
the test will be as follows:
- Dip time : 1min
- Number of dips: 1
Impulse Tester to carry out verification of Impulse Voltage (across clearance and across solid insulation) as per IEC 60065.
Features:
-
Impulse Voltage – 0.2kV to 10kV adjustable
-
Impulse Rise Time - 1.2mSec +/- 30%
-
Impulse Duration: 50mSec +/- 20%
-
Sequencing: Through micro controller based module to give time interval
between two pulses settable between 1S and 9S & number of pulses settable
to 9 pulses.
-
Selection of Polarity: Through switch/connecting links.
-
Voltage Monitor: Digital Meter to indicate peak voltage.
-
Output for Oscilloscope: Attenuated output 0 to 10V for 0 to 10kV
These are test jigs for
-
Abnormal Magnetic Field - DC 0.2Tesla: A continuous magnetic induction of 0.2Tesla +/- 5% is obtained at a distance of 5mm from the surface of the pole of the electromagnet energised with a DC current. The magnetic field is applied successively to all the surfaces of the meter. The value of the magnetomotive force to be applied is generally 10000amp-turns. Considering the non-linearity of the magnetisation of the core, the
magnetomotive force may require slight adjustment to achieve the desired output.
-
Abnormal Magnetic Field - AC 10milltesla: An alternating magnetic induction of 10 millitesla is obtained by placing the meter at various orientation in the centre of a circular coil with 2800 amp-turns, produced by a current of the frequency as that of the voltage applied to the meter and under the most unfavorable conditions of phase & direction.
-
Abnormal Magnetic Field - AC 0.2Tesla: An alternating magnetic induction is obtained from a circular air-cored coil (O.D.: 150mm. ID : 38mm Depth: 50mm, 14swg., 25,000 amp-turns) of 0.2Tesla +/- 5% in the central region, is applied to all the surfaces of the meter and under the most unfavorable conditionss of phase and direction, to determine any abnormality under its influence.
Phantom Load (Test Setup) for Single Phase Energy Meter
The test bench comprises of
- Power Source: 0 to 300V AC, 0 to 50A with Power Factor
adjustment facility from 0.1 Lag to 0.1 Lead through unity with seven
steps
- Digital Voltmeter: 0 to 300V AC
- Digital Ammeter: 0 to 1.000
- Digital Power Factor Meter: 0.1 Lag - Unity - 0.1 Lead
- Mains ON MCB: This is TPN MCB of 4A Rating provided for switch
ON/OFF
- Adjust Voltage Variac: This is Single Phase / 2A variac provided for
adjusting the output voltage from 0 to 300V
- Adjust Current Variac: This is a Single Phase / 2A variac provided
for adjusting the load current from 0 to the range selected by switch
- Set Power Factor Switch: For adjusting the power factor with seven
steps is provided. With this coarse adjustment of power factor can be
done
- Adjust Power Factor Fine Variac: This is a Single Phase / 2A variac
provided to fine tune the power factor
- Output Terminals: Two terminals for voltage & two terminals for
current are provided at the front panel to connect the `Meter under
Test' to the test set-up
For testing 3-phase energy meters, 3 such set-ups are housed in a single
unit.
Three Phase Power Source / Phantom Load unit
This set-up is used for production test of energy meters. It is normally
multi-station, such as a 40 station test set-up.
- Voltage Source: Adjustable 0 - 300 Volt/600VA with Static phase
shifting arrangement to obtain 90° lag through unity to 90° lead
with respect to Current Source. Facility to switch to 70% and 120% of
set voltage will be provided for creep test.
- Current Source: 0 - 100A adjustable in steps with switch and fine by
variac; Switching arrangement will be made to get 100%, 400%, 500%, 600%
and 800% of basic setting. Also, arrangement will be provided to select
0.4%, 5%, 10%, 20%, and 100% of setting for carrying out Starting
Current Test.
- Digital Ammeter 3 & 1/2 digit Class 1
- Digital Voltmeter 3 & 1/2 digit 0 - 300V class 1
- Power factor meter to read phase angle between 90° lag - Unity -
90° lead.
- Line frequency Indicator 40hz to 60hz
- Outputs on insulated terminals
