Transformer Core Grounding Current Monitor | Kazakhstan 2026

Country: Kazakhstan 2026
Quantity: 2
Switching Power Supply: JMD20-D15
Current sensor: ALT50A7-10A/A1

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Description

Grounding insight, guarding the iron core - integrated protection within your DGA monitor

For the same export project to Kazakhstan (Drawing No. 12878), the transformer core grounding current monitor's module is integrated into the transformer dissolved gas analyzer as an IED backend for core/clamp fault detection. Two sets of core monitoring modules are supplied alongside two oil chromatography units.

The core monitoring module adopts a high-precision zero-flux current sensor (model ALT50A7-10A/A1) installed on the core and clamp grounding down conductors. It measures grounding currents from 0 to 10A AC with a 4-20mA DC output, enabling real-time detection of multi-point grounding faults caused by insulation deterioration. The module is powered by a switching power supply (JMD20-D15, ±15V DC) and utilizes RVVP 4×0.75mm² control cables for signal transmission. Terminals (SAKEW35 for fixing, SAKDU 2.5N for low-voltage connections) ensure reliable internal wiring.

The system complies with GB/T 11022, DL/T 596-1996, DL/T 572-95, and enterprise standard QBO11-RX2009. It supports IEC 61850 communication protocol, seamlessly integrating with the transformer IED and substation monitoring system for remote data transmission and alarm output. By continuously tracking core grounding current trends, the module provides early warning of developing faults, enabling proactive maintenance and enhancing transformer operational safety.

Delivered to	Kazakhstan
Year	2026
Standard	GB/T 11022,DL/T 596-1996,DL/T 572-95,QBO11-RX2009
Control cable	RVVP 4*0.75mm₂
Switching Power Supply	JMD20-D15
Current sensor	ALT50A7-10A/A1
Terminal Fixing	SAKEW35
Low-voltage terminal	SAKDU 2.5N

product-1489-1053

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The current sensor is the core sensing element of the core/clamp online monitoring system. It is installed on the grounding down conductor of the transformer core and clamp using a non-contact feed-through structure. It measures from milliamperes to amperes, capturing weak circulating currents caused by insulation deterioration or multiple grounding points. With anti-electromagnetic interference design, it delivers high-linearity, low-noise analog signals for reliable data analysis.

This module is the data hub and control core of the system. It receives analog signals from the current sensor, performs filtering, amplification, and analog-to-digital conversion, then processes the data via an embedded processor. It identifies and filters out environmental interference, accurately detects multiple grounding faults, and triggers local alarms when current exceeds preset thresholds. Standard communication interfaces enable seamless connection to substation monitoring systems or smart management platforms for remote data access, parameter configuration, and fault diagnosis.

product-606-1076

No.	Check project	Test Contents				Conclusion
1	Surface Checkout	Scoring	Not have	corrode	Not have	Qualified
		Flaw	Not have	Clean and tidy	Qualified
		Be out of shape	Not have	Other	Qualified
2	Accuracy test	Test specification	Tolerance	Standard value	Measured value	Result
		10mA	±2.5% or ±1mA	10	9.88	Qualified
		20mA		20	19.56
		30mA		30	29.66
		40mA		40	39.55
		50mA		50	49.43
		100mA		100	99.7
		300mA		300	299.92
		500mA		500	500.14
		1000mA		1000	1001.1
		2000mA		2000	2002.65
		5000mA		5000	5007.66
		8000mA		8000	8006.9
		10000mA		10000	9999.25
3	Safe checkout	insulation resistance	The power input terminal is greater than or equal to 20MΩ for the housing			Qualified
3	Safe checkout	insulation strength	The power input end is connected to the housing, Power frequency, 1500V, 1 minute			Qualified

The Core Grounding Online Monitoring Module represents a vital complement to transformer diagnostic technology, offering enhanced detection of multi-point grounding faults and improved operational safety. Integrated as an IED backend module within the Transformer Dissolved Gas Analyzer, the system features a high-precision current sensor (ALT50A7-10A/A1) installed on the core and clamp grounding down conductors. It continuously monitors grounding currents from 0 to 10A AC with 4-20mA DC output, enabling early warning of insulation deterioration before faults escalate. With seamless IEC 61850 integration, robust terminal connections (SAKEW35, SAKDU 2.5N), and compliance with GB/T 11022, DL/T 596-1996, DL/T 572-95, and QBO11-RX2009, this module delivers reliable performance under harsh environmental conditions. As utility operators and industrial clients prioritize predictive maintenance and asset protection, the Core Grounding Online Monitoring Module will play an essential role in safeguarding transformer iron cores, complementing dissolved gas analysis for a complete, intelligent, and resilient power infrastructure for Kazakhstan and beyond.

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