Zjj-4SA Bus Detection Meter Digital Ground Fault Relay for Unground DC System

• Theory: Electromagnetic Relay
• Usage: Insulation Monitor
• Phase: 3
• Electricity Type: Dc
• Number of Pole: 3
• Load: Medium Power Relay
• Model NO.: ZJJ-4SA
• Protective Characteristics: Enclosed Rlay
• Action Principle: Electromagnetic Type
• Size: Miniature
• Type: Electric Parameter Relay
• Testing Voltage: 30 to 500V
• Operating Temperature: 20
• Measuring Range: 500V
• Dimensions: 170X110X150mm
• Accuracy Class: ±3%
• Transport Package: Please Consult for Details
• Specification: 10*10cm
• Trademark: OEM
• Origin: Zhejiang, China
• Production Capacity: 1000 Piece/Pieces Per Month

Product Description

Product Description

The ZJJ - 4SA DC insulation relay adopts a fully static circuit, and has a highly sensitive grounding resistance monitoring and display circuit, which helps users make a quantitative assessment of the reduction of the insulation degree of the DC busbar, and monitors the grounding resistance of the positive and negative busbars online in real-time. When the insulation drops below the set value, the relay sends a warning signal.

Due to the use of a full-hardware divider calculation circuit, it can directly display the grounding resistance value, which solves the confusion caused by the old relays that have no display or can only display the grounding current, and must manually check the table; the alarm threshold also uses the resistance value—directly displayed. ZJJ-4SA adopts an instrument structure with panels widely used in DC speed-regulating motors, solar power generation, and other fields.

 

Features

1. Positive and negative busbar grounding resistance value direct LCD;
2. Alarm resistance threshold online display and direct setting;
3. Bridge balance method for resistance measurement;
4. Terminals are pluggable for easy maintenance and replacement;
5. Various packaging structures, reinforced shell, modular structure, high reliability;

 

 

Specification

 

Parameters	Symbol	Conditions	Min.	Typical	Max.	Units
Operating voltage range	Vo	ZJJ-4SA-220	180	220	300	V
		ZJJ-4SA-110	90	110	150
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 τ=5mS			DC220V 0.2A
		Resistive load			DC220V 2A

Please consult for details

Application

1. DC or AC/DC main circuits;
2. UPs systems, battery systems;
3. IT systems with high leakage capacities;
4. DC charging stations for electric vehicles;
5. Monitoring the insulation of electrical equipment;
6. Supporting use of power transformers, generators, and motors;
7. Remote monitoring system, real-time monitoring of insulation conditions;

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