610H Intelligent Small Current Grounding Line Selection

Description

Product Overview

• Small Current Grounding Line Selection relies on the grounding line selecting device to identify single-phase ground faults in power systems with ungrounded neutral, resistor grounded neutral or arc-suppression coil grounded neutral.
• Widely used in power plants, substations, and the power supply systems of large industrial and mining enterprises for single-phase ground fault alarm on lines and busbars, or for line ground fault protection tripping.

Small Current Grounding Line SelectionFeatures

Category	Function Item	Core Specification
Grounding Line Selection Function	Transient Line Selection	Adopts transient route selection method
Grounding Line Selection Function	Zero-sequence Directional Line Selection	Adopts zero-sequence overcurrent directional selection method
Grounding Line Selection Function	PT Monitoring & Protection	Supports PT de-resonance and PT open-circuit monitoring
Grounding Line Selection Function	Reclosing & Acceleration Protection	Equipped with reclosing function and post-reclosing acceleration protection
Device Self-Test Function	Hardware Fault Detection	Automatically detects RAM, FLASH, A/D, power loss and other hardware faults
Device Self-Test Function	Parameter Validity Check	Automatically verifies setpoints, configuration parameters, coefficients and other settings
Communication Function	Communication Interface Support	Supports RS-485, RS-232, Ethernet and IEC 61850 communication modes (specify when ordering)
Communication Function	Real-time Data Upload	Can upload busbar voltage, current, grounding information, harmonic data and other real-time operating data
Communication Function	Remote Control & Command Reception	Can receive remote control, system synchronization and other control commands from the upper-level system
Panel & Operation Function	Human-machine Interface	Equipped with Chinese character LCD display, status indicator lights and keypad for easy monitoring and operation
Time Synchronization Function	Network Time Sync	Supports network-based time synchronization via communication channels
Time Synchronization Function	IRIG-B Code Sync	Supports IRIG-B code time synchronization

Rated Electrical Parameters

Category	Parameter Name	Specification Requirements
Power Supply Specifications	Rated Operating Voltage	AC/DC 220 V
Power Supply Specifications	Permissible Voltage Deviation	-20% ~ +15%
Power Supply Specifications	Ripple Factor	≤5%
AC Circuit Specifications	AC Rated Current In	1 A/5 A
AC Circuit Specifications	AC Rated Voltage Un	100 V
AC Circuit Specifications	Rated Operating Frequency	50 Hz
Power Consumption Specifications	DC Power Circuit Power Consumption	≤25 VA during normal operation; ≤30 VA when the device is activated
Power Consumption Specifications	AC Voltage Circuit Power Consumption	≤1 VA per phase at rated voltage of 100 V
Power Consumption Specifications	AC Current Circuit Power Consumption	≤0.5 VA per phase at rated current of 1 A; ≤1 VA per phase at rated current of 5 A

Working Principle of Small Current Grounding Line Selection

• When a single-phase-to-ground fault occurs in a low-current system, the transient current distribution is characterized by the following: the zero-sequence current in the faulted line has the maximum amplitude and is equal to the sum of the zero-sequence currents in the other, non-faulty lines.
• The Small current grounding line selecting device uses the concept of relative phase—specifically, the direction of the currents relative to one another or the leading and lagging relationships between current and voltage—to determine whether the fault is on the busbar or on the line;
• In the event of a line fault, the system accurately identifies the faulty line. Since the system operates on the principle of relativity, it overcomes the effects of changes in operating modes, ground resistance, and line length, and requires no calibration.

Small current grounding line selecting device Mechanical Installation Dimensions Drawing

• Dimensions: Width × Height × Depth = 484 × 177 × 285 (mm)
• Mounting hole dimensions: 445 × 177 (with 4 mounting holes, each 6.5 mm in diameter)

Small Current Grounding Line Selection Device Fixed-Price Order

No.	Display Name	Range	Step	Remark
1	Bus Setting			Bus I setting Bus II / Bus III / Bus IV are consistent with Bus I
1.1	Name	M001~M004	1
1.2	PT Ratio	1-1000	—
1.3	PT Disconnection	Enable / Disable	—
1.4	Outlet Quantity	—	—
1.5	Earth Fault Trip	Enable / Disable	—	Enable for trip, Disable for alarm
1.6	Earth Fault Time Delay	0.1S	0.1S
1.7	Post Acceleration	Enable / Disable	—	Need to set acceleration time if enabled
1.8	Earth Fault Voltage	5.0～100.0V	0.1V
1.9	Rotation Control	Enable / Disable	—
1.10	Voltage Threshold	0.1～100.0V	0.1V
1.11	Voltage Dead Zone	0.1～100.0V	0.1V
1.12	Rotation Mode	Auto / Fixed	—	Auto rotation mode / Fixed rotation mode
1.13	Rotation Time Delay	0.1S	0.1S
1.14	PT Blocking Earth Protection	Enable / Disable	—	Block earth protection when PT disconnection occurs
1.15	Rotation Voltage	5.0～100.0V	0.1V
1.16	Corresponding Bus Number	1-4	—
1.17	Permanent Fault Time Delay	0～100.0S	0.1S
1.18	Spare	Enable / Disable	—
1.19	Current Threshold	5～100mA	1mA
1.20	Spare	Enable / Disable	—
1.21	Current Dead Zone	5～100mA	1mA
1.22	Spare	Enable / Disable	—
1.23	Spare	Enable / Disable	—
2	Feeder Setting			Feeder No.01 Other feeders follow the same setting
2.1	Name	Line I B001	—
2.2	Line Type	Overhead / Cable / Station Internal	—
2.3	Line Trip Output No.	—	—
2.4	CT Ratio	1～1000	—
2.5	CT Polarity	Positive / Reverse	—
2.6	Transient Earth Fault Setting	5～100mA	1mA
2.7	Earth Delay High Byte	0～100.0S	0.1S
2.8	Line Earth Fault Trip	Enable / Disable	—	Trip when enabled, alarm when disabled
2.9	Earth Fault Current	5～100mA	1mA
2.10	Spare	—	—
2.11	Earth Delay Low Byte	0～100.0S	0.1S
2.12	Rotation Control	Enable / Disable	—	Participate in rotation if enabled
2.13	Rotation Sequence	1-4	—
2.14	Line Closing Output No.	—	—
2.15	Auto-reclosing Enable	0 / 1	—
2.16	Protection Trigger Reclosing	0 / 1	—
2.17	Reclosing Time Delay	0～100.0S	0.1S
3	Spare Setting	—	—
4	Resonance Threshold Setting
4.1	Spare	5.0～100.0V	0.1V
4.2	Spare	5.0～100.0V	0.1V
4.3	17Hz Resonance Threshold	5.0～100.0V	0.1V
4.4	25Hz Resonance Threshold	5.0～100.0V	0.1V
4.5	50Hz Resonance Threshold	5.0～100.0V	0.1V
4.6	150Hz Resonance Threshold	5.0～100.0V	0.1V
4.7	250Hz Resonance Threshold	5.0～100.0V	0.1V
4.8	Overvoltage Threshold	5.0～100.0V	0.1V
5	Binary Input Setting
5.1	Debounce Time Delay	10ms～9999ms	—	Factory default: 20ms
	Remote Signal Polarity 1～48	0 or 1	—
6	LCD Setting
6.1	Fault Lamp Reset Mode	Auto / Manual	—
6.2	Fault Lamp Return Time	0～120S	1s

 

FAQ

Q：What are the common technical parameters for selecting a Small Current Grounding Line Selection device for low-current ground fault line identification?

A:To summarize, when choosing a Small Current Grounding Line Selection & low-current ground fault detection device, key reference parameters are as follows: the quantity of control circuits (decided by on-site conditions), availability of trip function and fault recording function.