LHQ

Protect your high-voltage power infrastructure with our Cable Sheath Protector, engineered to safeguard 35kV, 66kV, 110kV, and above single-core cables from damaging induced overvoltages. Compliant with DL/T401-1991 standards, this essential device prevents insulation breakdown by limiting lightning surges, internal overvoltage waves, and fault-induced stresses on the cable’s metal sheath. By grounding transient voltages at the unshielded end, it eliminates risks of multi-point grounding failures, ensuring stable grid operation and extending cable lifespan. Ideal for substations, renewable energy farms, and industrial power networks, our protector delivers robust performance under extreme conditions. Reduce downtime, comply with regulations, and secure your investments with reliable overvoltage protection.

Price：

￥0.00
Category：

Lightning Arrester
Browse number：

30
Release time：

2024-10-22 03:36:56
Quantity： - +
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Detailed Description

Overview

35kV large cross-section power cables, as well as power cables with voltage grades of 66kV, 110kV and above, are all single-core cables. One end of the cable's metal sheath is interconnected and grounded, while the other end remains ungrounded. When lightning or internal overvoltage waves travel along the cable core, a high impulse overvoltage may occur at the ungrounded end of the cable's metal sheath. Alternatively, when a system short-circuit accident current passes through the cable core, a high power frequency induced overvoltage may also occur at the ungrounded end of the sheath. Such overvoltages may break down the insulation of the cable's outer protective layer, leading to multiple grounding faults in the cable's metal protective layer. This can seriously affect the normal operation of the power cable and even significantly reduce its service life. Therefore, the power industry standard DL/T401-1991 "Guidelines for the Selection of High-Voltage Power Cables" stipulates that a Cable sheath protector must be used to limit the induced voltage and fault overvoltage on the metal shielding layer (or metal sheath) of the power cable.

Product Features

The silicone rubber cable sheath protector designed by our company for cable lines with one end grounded and cross-connected has the following characteristics:

It adopts high-quality Zn0 chip with large capacity and low residual voltage, which has the characteristics of large current capacity and high protection ratio;
Limit and reduce the power frequency induced overvoltage and impulse overvoltage in the metal sheath of the cable line;
The silicone rubber jacket is integrally molded, with good sealing, strong anti-fouling ability, light weight, small size, anti-collision, heat resistance, cold resistance, aging resistance, and maintenance-free;
If a discharge counter or monitor is configured, it can automatically and accurately record the number of actions and operating quality of the protector under various overvoltages.

Electrical parameters of cable sheath protector

model	Rated voltage of the system (kV)	Power frequency withstand voltage/time kV/s	Residual voltage ≤ kVp under 10kA lightning impulse current	DC U1mA reference voltage ≥ kV	2ms square wave current capacity A	Leakage current at 0.75UimA ≤ μ A	Models of similar products currently circulating in the market that have not been labeled according to national standards
LHQ-6	10	1.9/4	4.6	2.1	400	50	BHO、BYL、 FBY、SHO、 BYLS、TBP-D
LHQ-10	35	3.6/4	8.7	4.0	400	50
LHQ-35	110	5/4	12	5.5	400	50
LHQ-110(1)	110	6/4	15	6.5	400	50
LHQ-110(II)	220	10/4	25	11.0	400	50
LHQ-220(1)	220	6/4	12	5.8	400	50
LHQ-220(II)	500	13.6/4	31	15.0	400	50
LHQ-500	10	7.5/4	8*	8.3	400	50

*Note: Residual voltage under lightning impulse current of 16k

Cable sheath insulation withstand voltage value (DL/T401-1991) "Guidelines for the selection of high-voltage power cables"

Cable rated voltage/system rated voltage Ue/U	1-minute power frequency withstand voltage kV	Lightning impulse withstand voltage kVp
37/63、48/63、64/100	24	37.5
127/220	24	47.5
190/330	24	62.5
290/500	24	72.5