7224RLY
Up to 52 Ap Current Source
7224RLY
For Protection Relay Production Testing and Commissioning
- High compliance voltage allows the 7224RLY to drive electromechanical relays directly
- Maintains phase accuracy for any load from a dead short to 2 ohms
- Front panel indicators for rapid assessment of amplifier status
- Protection circuitry protects from input overloads, improper output connection (including shorted and improper loads), over-temperature, over-current, and supply voltages that are too high or low
Key Performance Capabilities:
- Up to 50 Ap (35A RMS) output power at 0.5 ohms
- Up to 158 Vp output voltage
- Standard transconductance of 20 ±0.2% from short to 1-ohm load
- Residual noise of less than 2.5 mA peak, from 40 Hz to 600 Hz
OVERVIEW
The 7224RLYwas created to meet the demanding requirements of the power utility industry. Capable of outputting a 40 mSec pulse with up to 52 amperes peak current, the 7224RLY is powerful enough to put protection relays, fuses and other critical components through a full range of tests.
The low noise floor, low distortion and minimal phase error of the 7224RLY make it the ideal amplifier for power grid modeling.
OUTPUT CHART
Pulse/Burst Specifications
Note: Testing performed in mid-level mode using 40 ms pulses with a 30% duty cycle.
| TOTAL LOAD | DURATION | WAVEFORM | OUTPUT POWER |
| 1.0 ohms | 5 minutes | 60 Hz Sine | 28A RMS / 40A peak |
| DC | 20A peak | ||
| 20 seconds | 60 Hz Sine | 30A RMS / 43A peak | |
| DC | 20A peak | ||
| 0.2 seconds | 60 Hz Sine | 33A RMS / 47A peak | |
| DC | 30A peak |
Accuracy
| Amplitude vs Frequency at 1V input, 20A output, amplifier transconductance set to 20 |
|||
| Load | Input Signal | Transconductance | |
| 1 kHz | 100 Hz | ||
| 2 ohms | Sine | 19.9 | 20 |
| 1 ohm | Sine | 20 | 20 |
| o.5 homs | Sine | 20 | 20 |
| Short* | Sine | 20 | 20 |
* Unimpeded wire.
PERFORMANCE
SPECIFICATIONS
Performance
- Controlled-Current Bandwidth (0.25-ohm load): DC to 10 kHz
- Maximum Output Current (0.5-ohm load): 35A RMS (50 Ap)
- Maximum Output Voltage: 158 Vp
- Maximum Output Power:: Dependent on load and frequency
- Load Constraint for Maximum Output: 0.5 ohms + 200 mH (Note: all loads from 8-ohm to short are stable with 2 mH in series)
- Output Offset Current: Less than 10.0 mA DC peak
- Standard Transconductance (from short to 1-ohm load): 20 ±0.2%
- Common Mode Rejection Ratio (40 to 600 Hz): -58 dB minimum
- Unit-to-Unit Phase Error (60 Hz): ±0.1 degrees
- Residual Noise (40 to 600 Hz): Less than 2.5 mA peak
- Input-to-Output Phase Delay: -0.2 degrees
- Out Accuracy: Less than ±1%
Input Characteristics
- Balanced with ground: Three terminal barrier block connector, 20k ohm differential
- Unbalanced: BNC connector, 10k ohm single ended
- Max Input Voltage: ±10V, balanced or unbalanced
- Common Mode Rejection: -58 dB with 5V input
Status Display, Control, I/O
- Front Panel LED Displays indicate: Ready, Standby, Fault, Over Temp, Over Voltage, Overload
- Soft Touch Switches for: Run, Stop, Reset
- Gain Control, when enabled: Voltage gain adjustable from 20 to 0
- On/Off Breaker
- Back Panel Power Connection: 25 Amp IEC (with retention latch)
- Signal Output: Three-position terminal strip (OUTPUT/COM/CHASSIS GROUND)
- Signal Input: User-selectable BNC or barrier strip; balanced or unbalanced
Communication Capabilities
- Current Monitor: 5A/V ± 1%; 2.5A/V ± 1% (differential configuration)
- Reporting: System Fault, Over Temp, Over Voltage, Over Load
- Remote Control via Interlock Connector: Force to Standby, Reset after a fault
Protection
- Over/Under Voltage: ± 10% from specified supply voltage amplifier is forced to Standby
- Over Current: Breaker protection on both main power and low voltage supplies
- Over Temperature: Separate output transistor, heat sink, and transformer temperature monitoring and protection
Physical Characteristics
- Chassis: The amplifier is designed for stand-alone or rack-mounted operation. The chassis is black aluminum with a powder coat finish. The unit occupies two EIA 19-inch-wide units.
- Weight: 41 lbs (18.6 kg), Shipping: 51 lbs (23.2 kg)
- AC Power: Single phase, 120 VAC, 60 Hz, 10 Amp service; (220-240 VAC, 50-60 Hz, 10 Amp service model available)
- Operating Temperature: 10°C to 50°C (50°F to 122°F), maximum output Power de-rated above 30°C (86°F).
- Humidity: 70% or less, non-condensing
- Cooling: Forced air cooling from front to back through removable filters.
- Airflow: 180CFM
- Dimensions (HxWxD): 3.5” x 19” x 22.75” (8.9 cm x 48.3 cm x 57.8 cm)
PHOTOS
Controls, Indicators and Connectors
DOCUMENTS / DOWNLOADS
| 7224RLY Data Sheet | 7224 Manual | 7224RLY Manual Supplement | SIM Interlock Connector Pinouts and Functions | Configuration Settings | Step File for Chassis |
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