JY EKL2 Fault Circuit Indicator

I. Product Overview

The JY EKL2 Fault Circuit Indicator is a fault monitoring device specifically designed for 10kV medium-voltage power distribution lines. It can be directly installed on cable lines and quickly indicates the location of faults by detecting sudden changes in short-circuit current and ground fault current, helping maintenance personnel to quickly troubleshoot faults. It is widely used in ring main units, prefabricated substations, cable branch boxes, and outdoor cable lines, and is a key device for improving fault troubleshooting efficiency in medium-voltage power distribution systems.

II. Product Characteristics

1. Fault detection and indication performance

• Dual fault detection : It can detect both short-circuit faults and ground faults simultaneously. During a short circuit, it triggers an indication by detecting a sudden change in current, and during a ground fault, it triggers an indication by detecting a sudden change in zero-sequence current. The fault identification accuracy is high.
• Intuitive fault indication : LED indicator lights or flip-card indication are used. When a fault is triggered, the indicator light stays on or the flip card flips to intuitively display the location of the fault, making it easy for maintenance personnel to quickly locate the fault.
• Automatic reset function : After the line fault is cleared and the current returns to normal, the indicator can be automatically reset without manual intervention, improving operation and maintenance efficiency.
• Wide range detection : Adaptable to different line current levels, the operating current threshold can be set according to line parameters, and it is suitable for various power distribution line scenarios.

2. Structural and Installation Characteristics

• Clip-on installation design : It comes with a U-shaped metal clip, which can be directly clipped onto the cable line. It can be installed without power interruption, making it convenient and requiring no additional tools.
• Fully sealed structure : The outer shell is made of high-strength engineering plastic with an IP67 protection rating, making it moisture-proof, waterproof, dirt-proof, and salt spray-proof. It can operate stably for a long time in harsh environments such as outdoors, humid, and dusty conditions.
• Low power consumption design : It adopts low power electronic components and is powered by a built-in battery with a battery life of more than 5 years, eliminating the need for frequent battery replacements.
• Strong anti-interference performance : Built-in anti-interference circuit can effectively resist induced electric and electromagnetic interference in the line, avoid malfunctions, and improve the reliability of fault detection.

3. Environmental and Weather Resistance

• Strong wide temperature adaptability : It can adapt to a wide temperature range of -40℃ to +85℃. The electronic components are stable under high and low temperatures, with no risk of crashes or malfunctions. It is suitable for various outdoor and indoor scenarios.
• Excellent moisture and dirt resistance : The fully sealed shell structure prevents moisture and dust from entering, avoiding malfunctions caused by moisture and dirt accumulation in the internal circuitry.
• Excellent anti-aging properties : The outer shell is made of UV-resistant and aging-resistant engineering plastics, with a service life of more than 10 years. There is no risk of cracking or embrittlement during long-term outdoor use.

III. Technical Parameters

Parameter categories	project	Technical indicators
Applicable line parameters	Applicable system voltage (Un)	10kV
	Applicable cable outer diameter	16~30mm (other sizes can be customized)
	Applicable line current	10~630A
Fault detection parameters	Short circuit fault operating current	200~1000A (adjustable)
	Ground fault operating current	10~100A (adjustable)
	Fault response time	≤0.1s
	Reset method	Automatic reset (automatic reset after troubleshooting)
	Instruction method	LED indicator lights / flip-up indicator
Electrical parameters	working power supply	Built-in lithium battery power
	Battery life	≥5 years
	Static power consumption	≤10μA
Structural and environmental parameters	Main material	High-strength engineering plastic (shell), metal (clasp)
	Protection level	IP67
	Applicable altitude	≤2000m (Customization available for high altitudes)
	Ambient temperature	-40℃/ +85℃ (operating temperature), -40℃/ +70℃ (storage temperature)
	relative humidity	≤100% (no condensation)
	Seismic resistance level	Level 8
Implementation Standards		DL/T 1073 “Technical Conditions for Fault Indicators in Distribution Networks” and GB/T 17626 “Electromagnetic Compatibility Testing and Measurement Technology”

IV. Scope of Application

1. Applicable voltage level : 10kV AC medium voltage power distribution system, compatible with cable lines with a maximum operating voltage of 12kV.
2. Applicable equipment scenarios :
3. On the cable lines of 10kV ring main units, prefabricated substations, and cable branch boxes, indicate the location of short circuits and grounding faults;
4. Urban power distribution cable lines, power distribution systems for industrial and mining enterprises, and power distribution lines for new energy (photovoltaic/wind power) substations;
5. Fault monitoring of cable lines in various scenarios such as outdoor cable lines, underground utility tunnels, and cable tunnels.
6. Function and Purpose : Detects and indicates the location of short circuits and grounding faults in 10kV cable lines, helping maintenance personnel to quickly troubleshoot faults, shorten fault handling time, and improve the power supply reliability of the power distribution system.

V. Usage Conditions

1. Normal operating conditions

• Altitude: ≤2000m;
• Ambient temperature: -40℃~+85℃; equipment operating temperature complies with relevant standards.
• Relative humidity: ≤100% (no condensation);
• Environmental conditions: No corrosive gases, no flammable or explosive media, no severe vibration or impact;
• Installation method: It can be installed on the cable line by snap-fit, and can be installed horizontally or vertically. The installation position should be convenient for observing the status.

2. Special usage conditions (customization required)

• The altitude exceeds 2000m;
• The ambient temperature exceeds the range of -40℃ to +85℃;
• Severely polluted, salt spray, and chemically corrosive environments;
• Strong electromagnetic interference conditions;
• Non-standard cable outer diameter specifications;
• Special fault operating current threshold requirements scenario.

VI. Installation and Maintenance

1. Installation Requirements

• Before installation, inspect the product appearance for cracks, damage, and intact casing; check that the battery power is normal and the fault indicator function is normal.
• Clean the surface of the cable lines to remove oil, dust, and foreign objects, and ensure that the cable surface at the installation location is dry and clean.
• Adjust the clip size and attach the indicator to the cable line, ensuring the clip is securely installed and the indicator makes good contact with the cable.
• The installation location should be convenient for observing the indicator status, avoid strong electromagnetic interference sources, and avoid installation at cable joints, bends, or other similar locations.
• After installation, test the indicator’s fault detection function to ensure that the indicator functions normally when a short circuit or ground fault is triggered, and that the automatic reset function functions normally.

2. Maintenance Requirements

• Regularly inspect the appearance of the indicator; check for cracks, damage, and dirt accumulation, and ensure it is securely installed without loosening.
• Regularly check the battery level. If the indicator light dims or stops shining, the built-in lithium battery needs to be replaced.
• Regularly test the fault detection function to ensure that the indication is normal when a short circuit or ground fault is triggered, and that the automatic reset function is normal.
• Clean the indicator surface to remove dust and dirt, keep the casing dry and clean, and avoid corrosion from oil and chemicals.
• If the indicator malfunctions, fails to indicate, or cannot be reset, it must be replaced immediately. Operation with a malfunctioning indicator is strictly prohibited.

VII. Precautions

1. The product must be installed, debugged, and maintained by professional electrical personnel with medium-voltage power distribution construction qualifications. Operation by non-professional personnel is strictly prohibited.
2. The product must be used with cable lines of the corresponding specifications. It is strictly forbidden to install it on lines of different voltage levels, otherwise it will lead to equipment damage and safety accidents.
3. The indicator must not be disassembled or modified without authorization, otherwise the warranty and safety guarantee will be lost. It is strictly forbidden to use non-special tools to forcibly disassemble it.
4. The installation location should avoid cable joints, bends, and sources of strong electromagnetic interference to prevent affecting the accuracy of fault detection.
5. When storing, place in a dry, ventilated, and cool environment, avoiding direct sunlight, high temperature, humidity, and pressure. Do not allow it to come into contact with sharp objects that could damage the outer shell.
6. The fault indicator is only a fault monitoring device and cannot replace the relay protection device. Line faults still need to be handled in accordance with the power distribution safety regulations.

VIII. Model Description

Model Identification	meaning
JY	Product series code
EKL2	Fault indicator series code
Fault Circuit Indicator	Line fault indicator, used for indicating the location of short circuits and ground faults in 10kV cable lines.

IX. Implementation Standards and Certification

• National standards: DL/T 1073 Technical conditions for fault indicators in distribution networks, GB/T 17626 Electromagnetic compatibility testing and measurement techniques, GB/T 11022 Common technical requirements for high voltage switchgear and controlgear standards;
• The product has passed the type test of the National Power Equipment Quality Supervision and Inspection Center and meets the national power industry standards.

10. After-sales service

• Product warranty period: 18 months from the date of manufacture, or 12 months from the date of commissioning (whichever comes first).
• During the warranty period, products will be repaired or replaced free of charge if quality issues arise.
• We provide technical support, installation guidance, and customized services (adaptation to special cable outer diameters and special fault action thresholds).

Document Description

The technical parameters in this manual are based on standard operating conditions. Special operating conditions need to be customized according to actual needs. The final specifications shall be subject to the product technical agreement and type test report.

Appendix: Product outline diagram