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Help CenterOverhead Line Short-circuit and Ground Fault Indicator
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1 Summarize
Overhead line fault indicator (CSM - SC3) is applicable to power transmission and distribution lines of 10 kV--35kV voltage. It is used to detect short circuit and ground fault. It shows the indication with LED lights and red display. This model doesn’t have the function of wireless communication.
2 Features
Self-sustain |
Short-circuit fault detection |
The indicator is made with new material and special circuit designed. When the wire load current is greater than 10A, it begins to get the power from the wire. When the wire load current is greater than 30A, it can work normally without the lithium battery totally. |
We use quick break over-current two-stage current or adaptive load current flow mutation current protection principle, and line running status detection, it can effectively inhibit the closing and reclosing inrush current and feedback to send electrical misoperation (the parameters should be confirmed according to customer requirements before delivery). |
Ground fault detection |
Indication |
It can monitor the mutational increment of the grounding current. |
The indication is done by three flashing LEDs for a clear visibility and three red display areas by motor for a clear daytime visibility. Single-flashing means ground fault indication; double-flashing means short-circuit fault indication. |
Reset mode |
Current and voltage measurement |
|
1,1~48h timing reset(can be set before delivery, default 24h) 2,Intelligent reset(auto-reset after finish the emergency repair and restoring power transmission). |
Real-time monitoring of line load current, wire-to-ground voltage induction, instead of using current transformers and live displays. |
Live mounted and removal |
Antirust design |
The indicator can be mounted under live conditions with the help of an adapter and a hot stick. |
The tension discs are made of high quality nylon material. The groove springs are made of stainless steel so that they won’t melt with the wire. The thread jamming structure parts are made of stainless steel and with antirust design. |
Anti refuse operation design |
Anti misoperation design |
We adopt large cross-section design of magnetic circuit, it has good permeability performance, accuracy measurement and high sensitivity. They can be very sensitive no matter in the rural power line small load current or small mutations conditions or in the city network line two phase short circuit or slow flow conditions. |
It has anti misoperation design, when the inrush current occurs after the non-loading line is switched on and anti misoperation of non fault branch when it’s on.
|
3 Fault criterions
When the short-circuit fault occurs, we can shortly find out the fault point. For example, if the line 2 # phase B 2, 5 ,8 indicators and phase C 3, 6,9 indicators turn red display and 11,12 indicators are staying white display, then it can be judged that the point D has occurred short-circuit fault.
The line 2 # phase C 3, 6, 9 indicator day turn, and 12 indicator is still white, it can be judged a point D happen fault
3.1,Short-circuit fault criterions
(1)Quick break, over current criterion
- Live line lasts for more than 30s, current≥10A or Voltage to groud≥3KV
- Quick-break and over-current two-stage over-current protection value start: 0~700A/0~9.99s
- Line in power-cut status, current≤5A and Voltage to ground ≤ 70% (in 10 seconds)
(2) Adaptive load current’s over-current mutation criterion.
- Live line lasts for more than 30s, current≥10A or Voltage to ground≥3kV
- The fault startup conditions:
When the load current IL≤200A, ΔI ≥100A
When the load current IL>200A, ΔI ≥1/2*IL
- Fault duration: ≤10Sec
- Line outage: load current≤5A and voltage to ground ≤ 1kV
(Notice: The criterion should be chosen according to client requirement before delivery from the above two.)
3.2,Ground fault criterions
- Live line lasts for more than 30s, Voltage to ground ≥3KV
- The first half wave increment: ≥ 30A
- Earth-phase voltage drop ratio: ≥ 30%
- Earth-phase voltage reduction time: ≥ 60s
- The total current of earth-phase: ≥ 10A
(Notice: All the settable parameters should be set before delivery according to clients, they can’t be revised after delivery.)
4 Technical parameters
Battery |
4.8Ah/3.6V one long-life lithium battery |
Electric power |
50uA~20mA/3.6V(Corresponds to a load current 10A~600A) |
Available wire diameter |
8~40mm(Insulated wire, bare wire) |
Available load current |
0~600A(Default),0~100A,0~2000A,0~4000A |
Available voltage level |
≤35KV(can be set according to the customer) |
Quick-break over current Delay |
0~9.99S, Stepping0.01s |
Quick-break, over current settings |
0~700A or Phase sequence 0~4000A/ Zero sequence 0~70A), Stepping 1A (can be set before delivery) |
Maximum earth impedance |
500Ω |
Maximum short circuit current |
40KA |
Voltage Linearity |
Better than ±5% |
Current Accuracy |
±1%( Load current≥20A) or ±1A(Load current<20A) |
Short-circuit and ground fault indication |
Three flashing LEDs and three red display areas. Single-flashing means ground fault indication; double-flashing means short-circuit fault indication. |
Ambient temperature |
-35℃~70℃ |
Protection class |
IP65 |
Time of operation |
>5000 times |
Relative humidity |
≤95% |
Operating Altitude |
≤2000m |
Weight |
≈500 g |
Life |
≥10 years |
Maximum wind velocity |
35 m/s |
Seismicity |
0.1g |
Visual angle |
360° |
Notice: All the settable parameters should be set before delivery according to clients, they can’t be revised after delivery.
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