AC CURRENT GENERATOR POC-6000 (current from 0 to 1000 ARMS)

Transcription

1 AC CURRENT GENERATOR PERFORMANCES Wide range of current 50 db dynamic range Signal-to-noise ratio: 80 db open loop protection Stability < 0,1% Very low THD distortion < 0,3% External synchronization Build-up time of the current < 1 ms RS232 APPLICATIONS Normative tests of breakers Endurance tests Current relays tests Calibration of current sensors and wattmeter Generation of magnetic field DESCRIPTION Alternative current generator POC-6000 is built using a power bloc in linear technology with a current regulation. It is suitable for any application that requires an accurate and stable current, including when there is a load impedance variation. Thanks to the linear technology, it generates almost no electrical pollution and can be used in anechoic chamber. Its 0-10V analog isolated bus (setpoint input / current measurement output) and its 0-24V isolated digital bus, allow a use directly controlled by a PLC on a production line. To ensure a high precision on its entire output range, there are current ranges. The change of ranges is done automatically according to the amplitude to generate. It has a synchronization input and can be associated with other POC-6000 generators to create a three-phase network, or with another voltage generator to create a single-phase fictive power generator, or a three-phase fictive power generator. Entirely self-sufficient thanks to its touch-screen control / command card, it also can be remotely controlled for an easy integration into an automatic system using the TCP/IP Protocol on an Ethernet link, or SCPI on a RS232 or RS485 link. Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 1 / 10

2 AC CURRENT GENERATOR PRINCIPLE OF A GENERATOR WITH SEVERAL CURRENT RANGES CURRENT GENERATOR «POC-6000» BS1 BS3 TR K5 K4 HIGH K2 Mains PP1 CR1 BS2 BS4 K1 K3 LOW CONTROL / COMMAND DEVICE AND DISPLAY VOLTAGE AND CURRENT RELAYS COMMAND Example of a generator with «3 ranges» Behind PP1, thermal-magnetic circuit breaker, switch-on current limiter and filter, the input mains is rectified and filtered by "CR1" to create a DC ballast bus. Sets of power transistors BS1 to BS4 ensure to generate the primary voltage of T1 output transformer. The secondary of the transformer is composed of windings. Power contactors perform their coupling in series or in parallel to create the current ranges. In the example, the couplings are: TR K5 TR K5 TR K5 K4 K4 K4 K2 K2 K2 K1 K3 K1 K3 K1 K3 Range 1: the secondary windings are in series. Configuration low current, high voltage Range 2: medium configuration Range 3: the secondary windings are in parallel. Configuration high current, low voltage Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 2 / 10

3 OUTPUT AC CURRENT GENERATOR POWER OUTPUT Power Rated power 4000 VA Output on transformer Load impedance (1) Minimum value 1 mω Current ranges / compliance voltage Ranges qty Up to 8 16 A 256 V 32 A 128 V 64 A 64 V Ranges (ARMS / VRMS) 128 A 32 V 256 A 16 V 512 A 8 V Customized ranges 2 (2) Current frequency (3) Industry frequency range 45 to 65 Hz Aeronautic frequency range 300 to 900 Hz Resolution 0,1 Hz Current accuracy Typical 0,1% of the range + 0,1% of programmed value Current distortion at full power Max < 0,3% Current regulation for a mains variation +6% -10% Max < 0,1% of nominal current Residual noise Max RMS 0,02% of nominal current Max peak to peak 0,2% of nominal current Period necessary to obtain a stabilized current amplitude Max ½ period Variation according to temperature Max 50 ppm/ C Stability after 15 minutes of operation Max 0,1% of nominal current Output isolation relative to the case Measurement at 500 VDC > 100 MΩ Precision of the measurements displayed on the touch screen Voltage measurement 0,3% of full scale + 0,3% of measurement Current measurement 0,3% of full scale + 0,3% of measurement Note (1): In no way the load resistance of the current generator shall be less than this value, otherwise the equipment could be damaged. Note (2): The generator also has two digital outputs able to drive external contactors to create two additional ranges. Note (3): The user shall choose the frequency range when ordering (see options on page 10). Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 3 / 10

4 SYNCHRO- NIZATION AC CURRENT GENERATOR SYNCHRONIZATION Synchronization input (4) Voltage (full scale output) 7,07 VRMS / ± 10V peak Delay 0 to 360 Input impedance 10 kω Synchronization output (5) Type output frequency copy Max voltage ± 10 V Max current 10 ma Note (4): Generator has 2 synchronization modes: Internal Synchronization The current frequency is programmed on front panel of the equipment. External Synchronization The current frequency is the same as the frequency of the synchronization signal. However, a phase is programmable between the synchronization signal and the output current. Note (5): Whatever the mode of synchronization, the «POC-6000» generator delivers on this output, a square wave signal in phase with the output current. OPTION: INCREASE OF THE OUTPUT CURRENT TO 1024 ARMS An additional output transformer is proposed. This option includes: A current transformer: to increase the output current to 1000 ARMS with a compliance voltage of 4 VRMS max. Integration into a cabinet: the current generator and the transformer are integrated into a cabinet, width 600 mm and height 25 U. This cabinet is equipped with wheels with braking device. On rear panel, there are ventilation grids for a proper ventilation of the generator. All exit points are located on accessible copper bars at the bottom of the cabinet, in the back. Example of transformer 2000 ARMS Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 4 / 10

5 ANALOG AC CURRENT GENERATOR HOW TO PILOT THE GENERATOR The current generator is equipped with a control/command card with touchscreen. It has 3 operating modes: Local control: The control/command card with touchscreen on front panel allows to access to all the commands and to display the measurements. Remote control through communication protocols: An Ethernet TCP/IP interface and a RS232 interface allow the remote control with a PC. The generator can be directly controlled via TCP/IP or SCPI instructions, or using our OPS software. Remote control through a PLC: On a connector on rear panel, the generator has a set of analog and digital inputs and outputs for an analog and digital control. These inputs and outputs allow a direct control for a use in an automatic system. When starting, the generator receives its configuration: o Selection of the range on 3 bits, o Setpoint value through a 0~+10VDC analog signal For each test or unit under test, the generator receives basic commands: On, Off. It returns a 0~+10VDC analog voltage which indicates the amplitude of the output current according to the selected range. ANALOG INPUT AND OUTPUT Analog input Max voltage Input impedance Operation Analog output Max voltage Max current Operation +10 V 10 kω The DC voltage received on this input determines the RMS amplitude of the output current: a 10 V voltage corresponds to the full scale of the selected range +10 V 10 ma The DC voltage of this output determines the RMS amplitude of the output current: a 10 V voltage corresponds to the full scale of the selected range Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 5 / 10

6 DIGITAL AC CURRENT GENERATOR DIGITAL INPUTS AND OUTPUTS Principle of inputs and outputs +24V In 2kΩ Out 0V 4,7kΩ Digital input Digital output Characteristics of inputs and outputs Digital inputs Quantity 8 Max voltage +24 V (high level) Type Optocoupler Input current Limited by an internal resistance of 2 kω Digital outputs Quantity 8 Nominal voltage +24 V (high level) Type Opto-switch Max current 10 ma Low level Guaranteed by a 4,7 kω A pull-up resistor Assignment of the inputs Selection of the range (3 inputs) Start/Stop Fault message Inhibition of output (security) Increase / Decrease (used in targeting mode described on page 8) Free input Assignment of the outputs Selection of the range (3 outputs) In progress generation Equipment under test has tripped Voltage fault Thermal fault Free output Available for the user, free input and output allow to read a status and transfer it to an external device through Ethernet or RS232. Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 6 / 10

7 AC CURRENT GENERATOR DIGITAL INPUTS AND OUTPUTS The software has 2 main screens: Configuration selection Functioning of the selected configuration The configuration screen allows to choose the functioning modes: AUTO PLC (production), AUTO Local (validation tests), TARGETING (dichotomy search used for thresholds research). This screen also allows to select the current range and the current frequency. In AUTO PLC mode, only the setpoints given by the digital and analog inputs coming from the PLC are taken into account, the setpoints programmed on the touch-screen are deactivated. In AUTO Local mode, only the setpoints programmed on the touch-screen are taken into account, analog and digital inputs are not considered. To change the mode, the user chooses it in the drop-down menu Running mode, then validates by press on the button Validate. AUTO mode In AUTO mode, the user can program up to 5 steps in amplitude and in duration. To insert steps without generation, the current must be programmed at zero. At the bottom of the screen are displayed voltage, current and equipment status. Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 7 / 10

8 AC CURRENT GENERATOR TARGETING mode In TARGETING mode, are programmed: Amplitude and duration of the 1 st generation (MINI) and of the 2 nd generation (MAXI), The time between the two shots, The maximum number of iterations, The expected accuracy in Amps. The generation operates a series of spaced shots which amplitude is: MINI MAXI ½ (MINI + MAXI) According to the level of the Increase / Decrease digital input, the next current is different: If this input is at the high level, the current will be ¾ (MINI + MAXI) If this input is at the low level, the current will ¼ (MINI + MAXI) And so on for the following iterations. If the difference between the present current and the next current is less than the expected accuracy, the loop stops. Digital inputs and outputs This screen is very useful in maintenance phase or during the adjustment of the communication between the PLC and the generator. This screen allows: Manual forcing of the outputs by checkboxes: the output is at the high level if the box is checked, at the low level if unchecked A status control of inputs: the light is green when the input is at high level, and turned off (gray) when the input is at low level. Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 8 / 10

9 MECHANICS AND ENVIRONMENT MAINS AC CURRENT GENERATOR POWER Mains network Phases Three phases + Earth without Neutral Voltage between phases 400 VRMS -10% +6% Frequency Hz Input current at full output power Max per phase 12 ARMS per phase Protection Magneto-thermal breaker Inrush current Limitation by varistors Dielectric strength of mains input compared to the output connected to the case Measurement at 1500 VRMS/50Hz Current < 10 ma Power connector (provided not wired) Connector MARECHAL 01N8017 Connector cover MARECHAL 01NA FORMAT Metallic parts treatment Front panel painted aluminum RAL7035 Rear panel Aluminum treatment SURTEC650 Dimensions and weight Width 483 mm (19 inches) Height 355 mm (8U) Depth (excluding connectors) 620 mm Weight 120 kg Temperature and humidity Storage temperature -10 C à +85 C Operating temperature +0 C à +50 C Relative humidity 10% - 90% non-condensing Marking Marking CE Index of protection IP20 Protections Against overvoltage Cut of the power output (6) Against overheating Cut of the power output (7) Note (6): If the output voltage of the generator exceeds the allowable maximum value, the output is instantly switched off. Output will have to be reactivated by a local or remote manual control Note (7): A temperature sensor is place on each power element. It cuts the output in case of overheating. Output will have to be reactivated by a local or remote manual control. Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 9 / 10

10 AC CURRENT GENERATOR APPLICATIONS Single-phase use LOAD IMPEDANCE The POC-6000 generator can be used alone to test all kind of loads: fuse, relay contact, circuit-breaker pole Balanced three-phase use: test of differential, threepole and four-pole breakers Three generators POC-6000 can be associated to create a three-phase current generator: The cold poles are connected to each other Phase 1 IPh1 The POC-6000 Phase 1 insures to synchronize the POC-6000 phase 2, The POC-6000 Phase 2 insures to synchronize the POC-6000 phase 3, to insure a dephasing of 120 between phases. IPh3 N Synchro IPh2 Phase 3 Synchro Phase 2 Single-phase fictive power generator Synchro Un Used with a voltage source, the POC-6000 allows to control and calibrate electric meter and wattmeter. In N 1 ELECTRIC METER or WATTMETER N 1 Its output is isolated from ground, which allows a 350 VRMS voltage between the output and ground (or mechanical grounding). The programming of the phase, in external synchro use allows to have a power factor variable from -1 to +1. REFERENCE POC-6000-AC-512A-8V OPTIONS POC-1000A POC- MBT Current increase from 512 to 1024 ARMS Communication according to ModBus TCP protocol POC- AERO Frequency current range from 300 to 900 Hz (instead of frequency range of 40 to 70 Hz) The information in this document may be changed without notice Document ref: POC-6000-AC current generator_several ranges-en-v1 - Page 10 / 10