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Protector trip relay - Crompton Instruments - 250 Series - Synchro-Check (parallelling)
Features
- Single-phase or three-phase, three or four-wire
- Live and dead bus versions
- Adjustable set point
- LED trip indication
- Volt free relay contacts
Benefits
- Monitors voltage phase displacement and frequency of 2 supplies
- Frequency matching
- Voltage matching
- Phase angle matching
- Synchronisation of Gen-Bus and Bus-Bus
- Monitors auto synchronising systems
- Assists in manual synchronisation
Applications
- Marine panels
- Switchgear
- Distribution systems
- Generator sets
- Co-generation
- Control panels
Operation
As part of a manual control system, the operator will make adjustments to the generator voltage (excitation) and frequency (engine speed) using a synchroscope or lamps and will then attempt to manually close the breaker. This synchro check protector will qualify that the two systems are closely matched before permitting the breaker to close. As part of an automatic synchronising arrangement, this relay can be used as an independent backup or checking device to ensure the two systems are suitably matched before the breaker can close.
Model 256-PLL
The relay continuously monitors the voltage, phase displacement and frequency of two supplies. A single set point adjustment permits selection of suitable matching and a red LED illuminates when the relay is energised, indicating that the two supplies are well matched and it is safe to close the breaker.
Model 256-PLD
This version operates in the same way as model 256-PLL but includes an additional dead bus detection function. If there is a requirement for a continuous supply or emergency power, then the generator can be connected without synchronising, thus ensuring continuity of supply. The absence of bus voltage will cause the relay to energise.
Product Codes
Relay |
Protection |
ANSI no. |
Cat. no. |
1-phase, or
3-phase 3- or 4-wire |
Phase angle and voltage |
25 |
256-PLL |
1-phase, or
3-phase 3- or 4-wire |
Phase angle and voltage
Dead bus |
25 |
256-PLD |
Please specify system voltage, frequency and required options at time of ordering.
Specification – Synchro-Check (parallelling)
Nominal voltage |
100V, 110V, 120V, 208V, 220V, 230V, 240V, 277V, 380V, 400V, 415V, 440V or 480V |
System frequency |
45, 50, 55, 60 or 65Hz |
Burden |
Bus: 2VA Generator: 4VA |
Overload |
–25 to +30% of the nominal voltage |
Set point repeatability |
>0.5% of full span |
Differential (hysteresis) |
Pre-set at 1%. Values 1 to 10% available on request |
Trip level |
10 to 30% of the nominal voltage
6° to 20° electrical adjustment |
Output relay |
1 pair NO (normally open),
1 pair NC (normally closed)
2 pair NO and 2 pair NC available on request |
Relay contact rating |
AC: 240V 5A non inductive
DC: 24V 5A resistive |
Relay mechanical life |
0.2 million operations at rated loads |
Relay reset |
Automatic |
Operating temperature |
0°C to +60°C (0°C to +40°C for UL models) |
Storage temperature |
–20°C to +70°C |
Temperature co-efficient |
0.05% per °C |
Interference immunity |
Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a |
Enclosure style |
DIN-rail with wall mounting facility |
Material |
Flame retardant polycarbonate/ABS |
Enclosure integrity |
IP50 |
Dimensions |
150mm (5.9") wide x 70mm (2.8") high x 112mm (4.4") deep |
Weight |
1.0Kg approx. |
Dimensions
Model 256
Connections
256-PLL
256-PLD
Danh mục sản phẩm
System |
Input |
Protection |
BUS |
Catalog Number |
Synchro-Check (Paralleling) |
1ph or 3ph, 3w or 4w |
120V/60 Hz |
Phase Angle & Voltage |
Live BUS |
256-PLLU-PQBX-C6 |
1ph or 3ph, 3w or 4w |
120V/60 Hz |
Phase Angle & Voltage |
Dead BUS |
256-PLDU-PQBX-C6 |