BLUE JAY ZJJ Series Insulation Monitoring Relay User Manual
- June 10, 2024
- BLUE JAY
Table of Contents
User Manual
ZJJ – 4SC
DC Insulation Monitoring Relay
User Manual
Version:1.0
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When you use ZJJ 4SC DC insulation monitoring relay, be sure to read this user manual carefully, and be able to fully understand the implications, the correct guidance of operations in accordance with user manual, which will help you make better use of ZJJ 4SC DC insulation monitoring relay, and help to solve the various problems at the scene.
- Always keep safe distance between the instrument and operator.
- Measurements must not be taken when thunderstorms are nearby.
- Do not operate the instrument or accessories in explosive atmospheres.
- Do not open the instrument without permission, this will affect the warranty of the product. The factory is not responsible for self-disassembly.
- When the instrument is transported, it should avoid rain erosion and prevent collision and falling.
- When storing and keeping the instrument, attention should be paid to the ambient temperature and humidity, and it should be protected from dust, moisture, shock, acid, alkali and corrosive gas.
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SUMMARIZE
The ZJJ – 4SC 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 out 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-4SC adopts din rail installation,
are widely used in DC speed regulating motors, solar power generation and
other fields.
WORKING PRINCIPLE
The relay uses the bridge balance method to measure the ground resistance
on one side, as shown in the figure below. R1 and R2 are balanced resistors to
realize balanced voltage division at point A. RL is the current measurement
sampling resistance.
When a unilateral insulation voltage drop occurs, that is, when there is RX or
RY, the grounding current produces a positive or negative voltage drop Vo on
RL. Measure the size and direction of this voltage drop and calculate it
through the hardware voltage divider. circuit, the resistance value of RX or
RY can be obtained. An alarm will be triggered when any resistance value
exceeds the limit.
FEATURES
- Positive and negative busbar grounding resistance value direct LCD;
- Alarm resistance threshold online display and direct setting;
- Bridge balance method for resistance measurement;
- Terminals are pluggable for easy maintenance and replacement;
- Various packaging structures, reinforced shell, modular structure, high reliability;
- Wide monitoring voltage, 48-1500v, working voltage 24-220v can be customized.
APPLICATIONS
- DC or AC/DC main circuits;
- UPs systems, battery systems;
- IT systems with high leakage capacities;
- DC charging stations for electric vehicles;
- Monitoring the insulation of electrical equipment;
- Supporting use of power transformers, generators, and motors;
- Remote monitoring system, real-time monitoring of insulation conditions;
- Substations, power plants, transmission lines, distribution lines.
TECHNICAL PARAMETERS
Parameters| Symbol| Conditions| Min.| Typical|
Max.| Units
---|---|---|---|---|---|---
Operating
voltage range| Vo| ZJJ-4SC-220| 100| 220| 350| V
Power supply| lo| 85-265 Vac/dc| 7| | 10| mA
Relay capacity| VA| 2A@250vac| | | | A
Resistance
measurement range| Ro| | 0.0| | 1999| KO
Grounding
short-circuit current| lo| Vo=2000V| | | 0.6| mA
Measurement accuracy| | Vo=1000V| | 5%| |
Alarm setting range| Rs| | 0.0| | 990| KΩ
Moves back coefficient| | Rs=50K0| 95%| | 98%|
Output contact capacity| | Inductive T=5mS| | | DC220V 0.2A|
Resistive load| | | DC220V 2A|
INSTALLATION AND TERMINAL DEFINITION
Dimension: L x W x H:115 x 90 x 40mm, Standard 35mm Din rail.
Front view
Side view
Terminal definition: Terminal No.1 is connected to the positive busbar, No. 2 and No. 3 are grounded, No.4 is connected to the negative busbar, and No.5-6 are output alarm dry contacts.No.7-8 is the working power input.
OPERATING INSTRUCTIONS
Under normal circumstances, the “POWER” light is on, the “SET” light is off, and the LCD displays the current grounding resistance value. The “+” sign before the number indicates the positive busbar grounding resistance, and the “-” sign indicates the negative busbar grounding resistance.
When the grounding condition is good, when the grounding resistance is greater
than the default value of 35KΩ, the highest digit displays a positive or
negative “1”, indicating that the insulation resistance is infinite at this
time, which is the same as the display of electric resistance of ordinary
digital multimeters.
When the grounding resistance is less than the set default value of 35KΩ, the
display exceeds the limit, the highest digit displays positive or negative
“1”, and displays the specific resistance value. The red light of “ALARM” is
on, and the relay operates to send out an alarm signal.
Note:
When the last ground fault was positive bus grounded, the “+” sign will
continue to be displayed on the screen even if the fault recovers; the same is
true for negative bus grounded. When there is no grounding, the signs “+” and
“-” will be displayed randomly after power on.
Alarm value setting:
Press and hold the SET key, the “SET” light will be on, and the LCD will
display the current set value; use a small screwdriver to turn the
potentiometer knob on the panel, and the set value will change continuously.
The alarm function will be disabled when the set button is pressed. When in
the “measurement” state, avoid blindly adjusting the setting potentiometer, so
as to prevent the action threshold from being at an undesired value and
affecting the normal alarm.
SAFETY CONSIDERATIONS
All installation specification described at the previous chapters named: INSTALLATION AND STARTUP, INSTALLATION MODES and SPECIFICATIONS.
Please note that with the instrument powered on, the terminals could be dangerous to touching and cover opening actions or elements removal may allow accessing dangerous parts. This instrument is factory-shipped at proper operation condition.
◆ The device must have a professional installation and maintenance.
◆ Any operation of the device, you must cut off the input signal and power;
TECHNICAL SERVICE
For any inquiry about the instrument performance or whether any failure happens, contact to Blue Jay’s technical service.
Blue Jay – After-sales service
1802, Building 2, No.88, Jianxin East Road, Chongqing,400020, China
Tel – + 0086 023 67628702
E-mail: tech@cqbluejay.com
Tel: +0086-023-67628702
Email:tech@cqbluejay.com
www.cqbluejay.com
Add: 1802,Building 2,No.88,Jianxin East Road,Chongqing,400020,China
References
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