Relay protection test set with six voltages and six currents
Testing the differential protection of a three-phase transformer requires the currents of both windings at the same time, and that calls for a relay test set with six current channels. The AHZJB-1200 generates six 0-120 V voltages and six 0-30 A currents with class 0.2 accuracy, which can be freely combined or grouped up to 180 A, and has a built-in computer, display, trackball and keyboard for working without a PC.
AHZJB-1200 key data
- Current: 6 × 0-30 A per phase, 3 × 0-60 A or 1 × 0-180 A with all six phases in parallel; 450 VA per phase and 1000 VA in parallel; 10 A continuous. DC: 0-±10 A per phase.
- Voltage: 6 × 0-120 V phase-neutral and 0-240 V phase-phase (80/100 VA); DC: 0-±160 V per phase and 0-±320 V phase-phase (70/140 VA).
- Accuracy and frequency: class 0.2 on all outputs; 0-1000 Hz and harmonics up to 20th order.
- Combinations: 4 + 3 currents, 6 voltages, 6 currents or 12 outputs simultaneously.
- Inputs and outputs: 8 binary inputs for dry contacts or wet contacts at 11-250 V, and 4 outputs rated 220 V DC / 0.2 A and 220 V AC / 0.5 A.
- Timing: measurement from 0.1 ms to 9999 s with accuracy better than 0.1 ms.
- Unit: built-in Windows computer, display, trackball and keyboard; USB; 110/220 V, 1.5 A auxiliary DC supply.
Advantages
Three-phase differential without wiring tricks
The six currents feed both sides of a three-phase transformer differential protection simultaneously, and the differential and differential-harmonics modules calculate the points of the characteristic.
Clean waveform across the full range
Modular linear amplifiers, not switch-mode, deliver a waveform free of high-frequency noise from milliamperes up to maximum current, and the 32-bit digital signal processor generates it with low distortion.
No external computer
Windows, the display, trackball and keyboard are built into the unit; the USB port also allows operation with a PC.
Protected for field work
Soft start, self-diagnostics, output blocking and protection against overtemperature, overcurrent, overvoltage and short circuit, with automatic time limiting above 10 A.
Applications
- Current, voltage, frequency, inverse-time, directional power, impedance and synchronism relays.
- Line protection with auto-reclosing, distance and zero-sequence, and 6-35 kV line protection.
- Transformer, generator, busbar and fibre-optic line differential protection.
- Load shedding, loss of excitation and automatic synchronizers.
- Circuit-breaker timing using the binary inputs.
About the product
The AHZJB-1200 includes test modules for AC and DC, state sequence, harmonics, high and low frequency, direction and impedance, synchronization, complete-set testing, distance and zero-sequence, impedance characteristic, differential and fault playback, together with short-circuit calculation, vector diagram and reports. The fault can be triggered by time, by key, by binary input or by an external GPS pulse to test both ends of a line. It is supplied with test leads, clips, terminals and spare fuses.
Technical specifications
| Output channels | 6 voltage and 6 current; combinable as 4 + 3 currents, 6 voltages, 6 currents or 12 outputs |
| AC current per phase | 6 × 0-30 A, class 0.2 |
| Grouped AC current | 3 × 0-60 A; 1 × 0-180 A with all 6 phases in parallel |
| Continuous current | 10 A per phase |
| Current output power | 450 VA per phase; 1000 VA with 6 phases in parallel (10 s at max. output) |
| DC current | 0-±10 A per phase, class 0.2; max. load voltage 20 V |
| AC voltage | 6 × 0-120 V phase-neutral, class 0.2; 0-240 V phase-phase |
| AC voltage output power | 80 VA per phase; 100 VA phase-phase |
| DC voltage | 0-±160 V per phase, class 0.2; 0-±320 V phase-phase |
| DC voltage output power | 70 VA per phase; 140 VA phase-phase |
| Frequency and harmonics | 0-1000 Hz (fundamental); harmonics up to 20th order |
| Binary inputs | 8; dry contact (1-20 mA, 24 V) or wet contact (“0”: 0-6 V; “1”: 11-250 V) |
| Binary outputs | 4 dry contacts; 220 V DC / 0.2 A; 220 V AC / 0.5 A |
| Time measurement | 0.1 ms-9999 s; accuracy < 0.1 ms |
| Auxiliary DC supply | 110 V or 220 V, adjustable from 80 to 110 %; 1.5 A; 2 A / 250 V fuse |
| Signal generation | Digital signal processor, 32-bit computation, high-resolution D/A conversion and linear amplifiers |
| Control | Built-in Windows computer, display, trackball and keyboard; USB for PC |
| Fault triggering | By time, key, binary input or external GPS pulse |
| Protection | Soft start, self-diagnostics and output blocking; overtemperature, overcurrent, overvoltage and short circuit |
| Power supply | 220 V AC |
| Scope of supply | Test set, power cable, fuses, test leads, clips, plugs and pin terminals |
Specifications subject to change without notice.
Frequently asked questions
What is the maximum current of the AHZJB-1200?
30 A per phase with all six phases, 60 A per phase in three-phase mode and 180 A with all six phases in parallel for 10 s. Up to 10 A per phase it can operate continuously.
Does it need a PC?
No. It has a built-in Windows computer, display, trackball and keyboard. If preferred, it can be connected to a PC via USB.
Is it suitable for transformer differential protection?
Yes. With six currents it feeds both windings of a three-phase transformer at the same time, and it has dedicated differential and differential-harmonics modules.
What binary inputs does it accept?
Eight, for dry contacts or wet contacts up to 250 V: 0-6 V is read as a closed contact and 11-250 V as open.
How does it differ from the AHZJB-I?
The AHZJB-1200 has six voltages, six 30 A currents and a built-in computer; the AHZJB-I is three-phase, with four voltages and three 40 A currents, LCD display and rotary knob, or control from a PC.
