Description
The ZJJ-4SA LCD Display DC Insulation Monitoring Relay is a state-of-the-art device designed for monitoring insulation resistance in IT systems. This innovative relay utilizes a fully static circuit and features a highly sensitive grounding resistance monitoring and display circuit. It allows users to quantitatively assess the insulation degree of the DC busbar, providing real-time monitoring of the grounding resistance of both positive and negative busbars.
In the event that insulation drops below the preset value, the relay promptly issues a warning signal. The ZJJ-4SA employs a full-hardware divider calculation circuit, enabling direct display of the grounding resistance value, thereby eliminating the confusion often associated with older models that lack a display or only show grounding current. This device is ideal for applications in DC speed-regulating motors, solar power generation, and various other fields.
Specifications
| Parameters | Symbol | Conditions | Min. | Typical | Max. | Units |
|---|---|---|---|---|---|---|
| Operating voltage range | Vo | ZJJ-4SA-220 | 180 | 220 | 300 | V |
| Power supply | Io | 220 Vdc | 7 | 10 | mA | |
| Relay capacity | VA | 10A@250Vac / 30vdc | A | |||
| Resistance measurement range | Ro | 0.0 | 199.9 | KΩ | ||
| Grounding short-circuit current | Io | Vo=220V | 2 | mA | ||
| Measurement accuracy | Vo=220V | 5% | ||||
| Alarm setting range | Rs | 0.0 | 100.0 | KΩ | ||
| Moves back coefficient | Rs=50KΩ | 95% | 98% | |||
| Output contact capacity | Inductive | DC220V 0.2A | ||||
| Resistive load | DC220V 2A |
Additional Information
Features:
- Positive and negative busbar grounding resistance value displayed directly on LCD.
- Alarm resistance threshold displayed and set online.
- Bridge balance method for precise resistance measurement.
- Pluggable terminals for easy maintenance and replacement.
- High reliability with a reinforced shell and modular structure.
Applications:
- DC or AC/DC main circuits.
- UPS systems and battery systems.
- IT systems with high leakage capacities.
- DC charging stations for electric vehicles.
- Monitoring insulation of electrical equipment.
- Support for power transformers, generators, and motors.
- Remote monitoring system for real-time insulation condition monitoring.
- Substations, power plants, transmission lines, and distribution lines.
