Overhead outgoing signal type remote fault indicator

Monitor the operating status of distribution network lines
Collected fault alarm information
Real-time statistical analysis data
Locate line fault points

Overhead lines remote fault indicator

This product is suitable for neutral grounding, arc suppression coil grounding and small resistance grounding systems, applied to 6~35kV overhead lines. JJYW-BC overhead outgoing signal type remote transmission fault indicator is installed on the overhead line of 6~35kV, which is composed of acquisition unit and collection unit.

Monitor the operating status of distribution network lines
Collected fault alarm information
Real-time statistical analysis data
Locate line fault points

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Principle

Short-circuit fault detection principle

According to the characteristics of short circuit, the fault is judged by measuring the sudden change of current and its duration by electromagnetic induction method. A fault detection device that automatically ADAPTS to the change of load current and is only related to the short-circuit current component when fault occurs; No need to set the setting value, automatically adapt to the load current and substation line protection setting, to avoid large load fluctuations, closing surge current under the situation of misoperation.

The main criteria for action

First, the normal load current is greater than the power-on threshold value (default 3A) and remains for more than 30 seconds;

The sudden change of short-circuit current is greater than 150A (configurable), and the duration is greater than 40ms (configurable) and less than 3s;

Finally the switch trips and the current drops below 2A.

Principle of grounding fault detection

The method of external application signal detection is adopted. When the ground fault occurs and the zero voltage exceeds the set threshold, the external signaling device starts and injects characteristic current signals into the fault line; When the fault indicator of the fault line detects the characteristic current signal, the fault indicator gives a flip indicator and uploads it to the master station system.
External source and external signal type fault indicator are only suitable for single power supply systems. In the event of a ground fault, the external signal source superimposes a load between the normal phase and the fault phase (ground phase), so that the two form a loop, so that the characteristic current signal is injected into the grid, and this signal can only be detected before the fault point, and disappears after the fault point.

The external signal source is generally installed at the outlet of the substation line. When the line is normal, the signal source does not operate. When the ground fault occurs, the external signal source detects the presence of zero sequence voltage and identifies the ground fault. The external signal source performs a series of operations, and finally injects characteristic signals into the power grid through the non-fault phase of the cutting gate.
Taking the ground fault of phase C as an example, when the non-fault phase (take phase B as an example) is closed by the external signal source, the BC phase is looped through the ground. A current is generated in phase C, from the substation outlet to the ground fault, flows into the ground, and flows through the ground back to the external resistance load inside the signal source, and finally reaches phase B. Therefore, both F1 and F2 fault indicators can detect characteristic current signals between the substation and the ground fault point. After grounding the fault point, the F3 fault indicator will not detect the characteristic current signal, so it will not flop action.

Therefore, it can be determined that the fault point is between F2 and F3.

Function

Ground short circuit fault alarm

The collection unit can capture information such as grounding and short circuit faults of overhead lines, generate a flashing alarm on the spot, and send the fault type and time to the collection unit through wireless communication. The collection unit reports the fault to the master station.

SOE

The collection unit can record the latest 256 SOE events, including various types of event records such as grounding, short-circuit fault occurrence and disappearance, backup power input and exit, each record with a time scale accurate to milliseconds.

Remote signaling

When ground, short circuit or other faults occur on the line, the collecting unit sends the remote message information to the master station according to the configured remote message point number, and can call data through the master station.

Telemetry

The acquisition unit measures the current current and electric field value of the line in real time, and reports the time interval according to the timing telemetry (default parameter 15 minutes). The measured load current and other data are sent to the collection unit through wireless communication, and the collection unit is forwarded to the main station, and can be summoned through the main station.

Remote control

Remote commands can be sent to the collection unit through the master station.

Fault recovery

The collection unit has the functions of timing automatic return, call return and remote control return. Automatic return and call return time can be specified by the user factory Settings or on-site Settings, automatic countdown starts when the fault occurs, the return time error is not more than ±1%.

Application Standards

Vibration
Meet GB/T11287 standard, harsh grade Ⅰ;
Fall
Comply with Q/GDW436-2010 regulations;
The vertical ground height is 1m, the fall is once, the appearance, structure and function of the acquisition unit meet the requirements of Q/GDW436-2010;
Grip
Comply with Q/GDW436-2010 regulations;
The downward force perpendicular to the horizontal direction of the spring formed by the pressure line is not less than 8 times the overall weight of the collection unit;
After the acquisition unit is installed on the steel core aluminum strand, the lateral tension along the aluminum strand is not less than 50N;
Electrostatic discharge immunity
In accordance with the provisions of GB/T17626.2-2006, the severity level is Ⅳ.
Radiofrequency electromagnetic field radiation immunity
Meets the requirements of GB/T17626.3-2006, and the severity grade is Ⅳ.
Surge (impact) immunity
In line with GB/T17626.5-2008 regulations, the severity level is Ⅳ.
Electrical fast transient pulse group immunity
In accordance with GB/T17626.4-2008 regulations, the harsh grade is Ⅳ.
The power frequency magnetic field immunity
Meets the requirements of GB/T17626.8-2006, and the harsh grade is Ⅴ.
Pulsed magnetic field immunity
Meets the requirements of GB/T17626.9-2011, and the severity level is Ⅴ.
Damping oscillating field immunity
In accordance with the provisions of GB/T17626.10-1998, the harsh grade is Ⅴ.
Proximity interference
Complies with Q/GDW436-2010.

Specifications

Acquisition unit

Performance classification	Parameter name	index
Electrical parameter	Quick break current valuevalue	500A (default)
	Grounding current Start value	30A (default)
	Applicable voltage level	6 ~ 35 kV
	Applicable load current	0 to 650A
	Applicable working frequency	50 Hz
	Allow through the maximum fault current	31.5 kA / 4 s
	Accuracy of load current	0 ~ 100A: ±3A; 100 ~ 600A: ±3%
	Power supply mode	CT charging + lithium battery
	Communication mode	Radio frequency
	Static power consumption	40 mu A or less
	Transmitting power consumption	< 16 mA
Engineering parameter	Reset mode	Remote control reset, timed reset, power-on reset
	Number of movements	>5000 times
	Continuous flash time	>2000h
	Operating ambient temperature	-40 ℃ to +70 ℃
	Operating relative humidity	≤ 95%
	Applicable wire cross-sectional area	35mm2 to 240mm2
	Maximum wind speed	≤35 m/s
	Class of protection	IP67
	Service life	Eight years
	MTBF	60000 H

Collecting unit

Main power supply	Solar power collection
Backup power supply	1 12V/7AH rechargeable battery
Power consumption (online, no communication)	0.2 or less VA
Wireless communication type	2G/3G/4G full Netcom
Communication distance	≥1000m
Secure encryption	Support State network hardware encryption
Operating temperature	-40 ~ 70℃
Relative humidity	95% (no condensation)
Class of protection	IP55
Service life	Not less than 10 years (except for backup batteries)
Overall dimensions (length, width, height)	390×340×140mm (excluding solar panels)
weight	Approx. 4.9Kg
System clock	Independent hard clock, independent battery, daily timing error ≤0.5s/d
The number of collection units is supported	Up to 9

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Overhead outgoing signal type remote fault indicator

Overhead lines remote fault indicator

Short-circuit fault detection principle

Principle of grounding fault detection

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