7224RLY: Up to 52 Ap Current Source
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.
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
Output
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 |
Performance
Current Output
Accuracy
Amplitude vs. Frequency at 1V input, 20A output, |
|||
| Load | Input Signal | Transconductance | |
| 1 kHz | 100 Hz | ||
| 2 ohms | Sine | 19.9 | 20 |
| 1 ohm | Sine | 20 | 20 |
| 0.5 ohm | Sine | 20 | 20 |
| Short* | Sine | 20 | 20 |
*Unimpeded wire.
Front & Back
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)
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