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Description
PVC insulated flame retardant power cable for coal mine
I. Product Standards
This product is produced according to MT 818-2009 "Cable for Coal Mine" and related enterprise standards.
Second, the scope of application
This product is suitable for fixed installation in distribution networks or industrial installations with a power frequency rated voltage of 0.6/1 kV and below.
Three, use features
Power frequency rated voltage: U0/U 0.6/1kV.
The long-term maximum temperature of the cable conductor does not exceed 70℃.
Ambient temperature should not be lower than 0℃ during cable laying.
Cable bending radius: not less than 10 times the outer diameter of the cable.
Four, cable model
| Model | Name | Applicability |
|---|---|---|
| MVV | Coal mine copper core PVC insulated PVC sheathed power cable | Indoor tunnels and cable trenches cannot withstand mechanical external forces. |
| MVV22 | Coal mine copper core PVC insulated steel tape armored PVC sheathed power cable | Indoors, tunnels, cable trenches or directly buried underground, it can be used in humid environments and places with high groundwater levels, and can withstand certain mechanical external forces and certain tensile forces. Indoors, tunnels, cable trenches, shafts or directly buried underground, etc., can withstand mechanical external force and a certain tensile force. |
| MVV32 | Coal mine copper core PVC insulated fine steel wire armored PVC sheathed power cable | |
| MVV42 | Coal mine copper core PVC insulated thick steel wire armored PVC sheathed power cable |
V. Voltage test
1. The voltage test should be carried out at ambient temperature, and the manufacturer can choose to use power frequency AC voltage or DC voltage.
2. Test voltage
The power frequency test voltage is 2.5U0+2kV, and the single-phase test voltage corresponding to the standard rated voltage is as follows:
| rated voltage U0 (kV) | 0.6 | 1.8 |
|---|---|---|
| Test voltage kV | 3.5 | 6.5 |
| time min | 5 | 5 |
(1) If a three-phase transformer is used to conduct a voltage test on a three-core cable at the same time, the phase-to-phase test voltage should be 1.73 times the data listed in the table above.
(2) When the DC voltage is used in the voltage test, the DC voltage value should be 2.4 times the power frequency AC voltage value.
(3) In any case, the voltage should be gradually increased to the specified value.
3. Laying and installation
*Direct burial laying
(1) When the single-core cable is laid without contact, the distance between the center of the cable is twice the diameter of the cable.
(2) Soil temperature: 25℃
(3) Long-term maximum working temperature of conductor: 70℃
(4) Soil thermal resistance coefficient: 1.0℃M/W
(5) Direct burial depth: 0.7m
Ampacity correction factor at different soil temperatures:
| Soil Temperature | 20℃ | 25℃ | 30℃ | 35℃ | 40℃ |
|---|---|---|---|---|---|
| Correction Factor | 1.04 | 1 | 0.96 | 0.92 | 0.87 |
*laying in the air
1. When the single-core cable is laid in parallel, the center distance is 2 times of the cable diameter for 185mm2 and below; 90mm for 240mm2 and above.
2. Ambient air temperature: 40℃
3. Long-term maximum working temperature of conductor: 70℃
Ampacity correction factor at different ambient temperatures:
| Ambient Air Temperature | 20℃ | 25℃ | 30℃ | 35℃ | 40℃ | 45℃ |
|---|---|---|---|---|---|---|
| Correction Factor | 1.2 | 1.22 | 1.15 | 1.08 | 1 | 0.91 |
35kV and below XLPE insulated power cables
I. Implementation standards
This product implements GB/T 12706-2008 and enterprise standards
Flame retardant properties conform to GB/T 18380-2008, GB/T 19666-2005
Second, product features and uses
This product is used in power transmission and distribution systems of 35kV and below for power transmission and distribution. Low-smoke halogen-free flame retardant, low-smoke and low-halogen flame retardant performance is higher than the normal national flame retardant standards, widely used in airports, nuclear power plants, key water conservancy projects, petroleum, chemical, transportation, high-rise buildings and other strict requirements for flame retardant performance place.
Three, use features
Rated voltage (U0/U): 0.6/1kV, 3.6/6kV, 6/10kV, 8.7/10kV, 8.7/15kV, 12/20kV, 18/20kV, 21/35kV , 26/35kV;
The long-term working temperature of the cable conductor is 90℃, and the maximum temperature of the cable conductor does not exceed 250℃ during short circuit (the longest duration does not exceed 5 seconds);
The DC resistance of the cable conductor meets the requirements of GB/T 3956;
The ambient temperature when the cable is laid shall not be lower than 0℃, and the minimum bending radius shall not be less than 15 times the outer diameter of the cable;
Cable laying is not limited by drop;
Power frequency withstand voltage test:
U0 is the cable below 3.6kV; 2.5U0+2kV/5min will not break down.
U0 is 3.6kV and above cables: 3.5U0/5min does not break down.
Partial discharge test:
U0 When the voltage is 18KV and below, the applied voltage is 1.5U0, and the discharge capacity is not more than 20pc.
U0 is above 18KV, the applied voltage is 1.5U0, and the discharge capacity is not more than 10pc.
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