Medium voltage cable GB/T 12706 standard

Medium-voltage power cables are the main products for short-distance, high-capacity power transmission.

Features

With the increasing demand for power transmission capacity, 35kV high-voltage single-core cables
More and more people are using it. Its advantages are: interphase insulation is easy to guarantee, no Prone to phase-to-phase short circuit; the cable is more convenient to transport and easier to lay; a reel of cables
It can be made relatively long, and the single-core cable has a large carrying capacity under the same cross-section.
Cross-linked polyethylene insulated cables use peroxide cross-linking method to make polyethylene molecules change from linear molecular structure to three-dimensional network structure, from thermoplastic material to thermosetting material, and the working temperature is increased from 70°C to 90°C, significantly Improve the current carrying capacity of the cable.
XLPE insulated cables have superior electrical properties, heat resistance, chemical resistance, environmental stress cracking resistance, aging resistance, and long service life.
Halogen-free low-smoke flame-retardant XLPE insulated cable has excellent flame-retardant properties, and the sheath material does not contain halogen, which can ensure that only a small amount of toxic and corrosive gases are released during combustion, and has the characteristics of producing less smoke. An environmentally friendly new product with superior electrical performance, heat resistance, chemical resistance, environmental stress cracking resistance, aging resistance, and long service life.

Application

XLPE insulated cables are suitable for distribution networks, industrial devices or other fields that require large-capacity electricity. They are used for fixed laying on power transmission and distribution lines with AC 50Hz and rated voltages of 6kV~35kV. The main function is to transmit electric energy. XLPE insulated flame retardant cable has the function of preventing the fire from spreading in the cable circuit, which can avoid the expansion of fire accidents and reduce losses. It is suitable for places with high cable laying density such as subways, tunnels, and high-rise buildings.

Construction

Medium-voltage power cables have shielding and sheathing, and non-magnetic armoring can be used under necessary conditions. Refer to the figure below for the structure of conventional cables.

Performance

Number of Cores and Nominal Area	Nominal Thickness of Insulation	Approx. Overall Diameter	Approx. Weight Copper	Approx. Weight Aluminium	Max. DC Resistance at 20℃ Copper	Max. DC Resistance at 20℃ Aluminium	Recommending Current Rating  Copper Direct In Soil	Recommending Current Rating  Copper In air	Recommending Current Rating  Aluminium Direct In Soil	Recommending Current Rating  Aluminium In air
											Nos×mm2	mm	mm	kg/km	kg/km	Ohm/km	Ohm/km	A	A	A	A
											1×25	3.4	20.0	609	454	0.727	1.2	190	143	145	111
1×35	3.4	21.0	725	510	0.524	0.868	225	172	175	133
1×50	3.4	22.1	866	575	0.387	0.641	270	205	210	159
1×70	3.4	24.0	1112	692	0.268	0.443	335	253	260	197
1×95	3.4	26.0	1409	826	0.193	0.32	405	305	315	237
1×120	3.4	27.5	1672	936	0.153	0.253	460	350	360	272
1×150	3.4	29.1	1975	1067	0.124	0.206	520	396	405	307
1×185	3.4	30.8	2354	1217	0.0991	0.164	585	451	455	351
1×240	3.4	33.4	2955	1461	0.0754	0.125	690	528	535	412
1×300	3.4	35.8	3585	1711	0.0601	0.1	775	601	605	470
1×400	3.4	38.7	4439	2042	0.047	0.0778	890	695	705	546
1×500	3.4	42.3	5556	2479	0.0366	0.0605	1010	800	805	633
1×630	3.4	46.2	6992	3012	0.0283	0.0469	1130	916	920	732
1×800	3.4	50.8	8790	3694	0.0221	0.0367	1270	1036	1050	838

Number of Cores and Nominal Area	Nominal Thickness of Insulation	Approx. Overall Diameter	Approx. Weight Copper	Approx. Weight Aluminium	Max. DC Resistance at 20℃ Copper	Max. DC Resistance at 20℃ Aluminium	Recommending Current Rating  Copper Direct In Soil	Recommending Current Rating  Copper In air	Recommending Current Rating  Aluminium Direct In Soil	Recommending Current Rating  Aluminium In air
											Nos×mm2	mm	mm	kg/km	kg/km	Ohm/km	Ohm/km	A	A	A	A
											3×25	3.4	39.4	1963	1493	0.727	1.2	135	142	105	110
3×35	3.4	42.0	2357	1705	0.524	0.868	165	173	125	133
3×50	3.4	44.5	2817	1935	0.387	0.641	195	208	150	161
3×70	3.4	48.4	3656	2382	0.268	0.443	240	260	185	201
3×95	3.4	52.3	4584	2814	0.193	0.32	290	317	225	245
3×120	3.4	55.7	5427	3194	0.153	0.253	325	365	255	283
3×150	3.4	58.9	6403	3648	0.124	0.206	370	417	285	323
3×185	3.4	62.8	7682	4235	0.0991	0.164	415	478	325	372
3×240	3.4	68.4	9531	5001	0.0754	0.125	485	563	380	439
3×300	3.4	73.6	11496	5812	0.0601	0.1	540	645	425	505
3×400	3.4	80.0	14330	7062	0.047	0.0778	620	749	490	593
3×500	3.4	87.8	17926	8594	0.0366	0.0605	-	-	-	-
3×630	3.4	96.3	22595	10525	0.0283	0.0469	-	-	-	-

Number of Cores and Nominal Area	Nominal Thickness of Insulation	Approx. Overall Diameter	Approx. Weight Copper	Approx. Weight Aluminium	Max. DC Resistance at 20℃ Copper	Max. DC Resistance at 20℃ Aluminium	Recommending Current Rating  Copper Direct In Soil	Recommending Current Rating  Copper In air	Recommending Current Rating  Aluminium Direct In Soil	Recommending Current Rating  Aluminium In air
											Nos×mm2	mm	mm	kg/km	kg/km	Ohm/km	Ohm/km	A	A	A	A
											1×35	8.0	33.6	1518	1310	0.524	0.868	220	180	170	140
1×50	8.0	34.7	1692	1406	0.387	0.641	260	216	200	168
1×70	8.0	38.4	2388	1974	0.268	0.443	320	266	250	207
1×95	8.0	40.1	2734	2159	0.193	0.32	390	320	300	248
1×120	8.0	41.8	3069	2343	0.153	0.253	445	365	345	284
1×150	8.0	43.2	3407	2512	0.124	0.206	500	412	395	320
1×185	8.0	45.1	3865	2745	0.0991	0.164	570	468	440	365
1×240	8.0	47.7	4561	3085	0.0754	0.125	665	546	515	425
1×300	8.0	50.3	5293	3447	0.0601	0.1	750	620	585	483
1×400	8.0	53.3	6249	3888	0.047	0.0778	865	713	680	560
1×500	8.0	57.3	7542	4510	0.0366	0.0605	980	817	775	648
1×630	8.0	61.6	9165	5244	0.0283	0.0469	1110	933	895	746
1×800	8.0	65.9	11074	6052	0.0221	0.0367	1250	1054	1020	854

Number of Cores and Nominal Area	Nominal Thickness of Insulation	Approx. Overall Diameter	Approx. Weight Copper	Approx. Weight Aluminium	Max. DC Resistance at 20℃ Copper	Max. DC Resistance at 20℃ Aluminium	Recommending Current Rating  Copper Direct In Soil	Recommending Current Rating  Copper In air	Recommending Current Rating  Aluminium Direct In Soil	Recommending Current Rating  Aluminium In air
											Nos×mm2	mm	mm	kg/km	kg/km	Ohm/km	Ohm/km	A	A	A	A
											3×35	8.0	54.4	3722	3264	0.524	0.868	160	150	125	115
3×50	8.0	56.8	4174	3550	0.387	0.641	190	180	145	140
3×70	8.0	59.6	4775	3913	0.268	0.443	230	220	180	170
3×95	8.0	63.5	5668	4423	0.193	0.32	275	265	215	205
3×120	8.0	67.6	6749	5021	0.153	0.253	315	305	245	235
3×150	8.0	71.2	7751	5571	0.124	0.206	355	345	275	270
3×185	8.0	74.4	8793	6103	0.0991	0.164	400	390	310	305
3×240	8.0	78.7	10210	6844	0.0754	0.125	460	455	360	355
3×300	8.0	85.7	13165	8728	0.0601	0.1	520	525	410	410
3×400	8.0	90.8	15357	9807	0.047	0.0778	590	600	465	470
3×500	8.0	97.6	18417	11319	0.0366	0.0605	-	-	-	-

Number of Cores and Nominal Area	Nominal Thickness of Insulation	Approx. Overall Diameter	Approx. Weight Copper	Approx. Weight Aluminium	Max. DC Resistance at 20℃ Copper	Max. DC Resistance at 20℃ Aluminium	Recommending Current Rating  Copper Direct In Soil	Recommending Current Rating  Copper In air	Recommending Current Rating  Aluminium Direct In Soil	Recommending Current Rating  Aluminium In air
											Nos×mm2	mm	mm	kg/km	kg/km	Ohm/km	Ohm/km	A	A	A	A
											1×25	3.4	23.9	876	721	0.727	1.2	190	143	145	111
1×35	3.4	24.9	1005	790	0.524	0.868	225	172	175	133
1×50	3.4	26.0	1160	869	0.387	0.641	270	205	210	159
1×70	3.4	27.8	1417	996	0.268	0.443	335	253	260	197
1×95	3.4	29.9	1738	1155	0.193	0.32	405	305	315	237
1×120	3.4	31.4	2020	1284	0.153	0.253	460	350	360	272
1×150	3.4	33.1	2342	1434	0.124	0.206	520	396	405	307
1×185	3.4	35.2	2776	1640	0.0991	0.164	585	451	455	351
1×240	3.4	39.2	3790	2296	0.0754	0.125	690	528	535	412
1×300	3.4	41.6	4476	2602	0.0601	0.1	775	601	605	470
1×400	3.4	44.6	5398	3002	0.047	0.0778	890	695	705	546
1×500	3.4	48.8	6651	3574	0.0366	0.0605	1010	800	805	633
1×630	3.4	52.8	8183	4203	0.0283	0.0469	1130	916	920	732
1×800	3.4	57.4	10078	4982	0.0221	0.0367	1270	1036	1050	838

Number of Cores and Nominal Area	Nominal Thickness of Insulation	Approx. Overall Diameter	Approx. Weight Copper	Approx. Weight Aluminium	Max. DC Resistance at 20℃ Copper	Max. DC Resistance at 20℃ Aluminium	Recommending Current Rating  Copper Direct In Soil	Recommending Current Rating  Copper In air	Recommending Current Rating  Aluminium Direct In Soil	Recommending Current Rating  Aluminium In air
											Nos×mm2	mm	mm	kg/km	kg/km	Ohm/km	Ohm/km	A	A	A	A
											3×25	3.4	45.8	2984	2514	0.727	1.2	135	142	105	110
3×35	3.4	48.5	3442	2790	0.524	0.868	165	173	125	133
3×50	3.4	51.3	3990	3107	0.387	0.641	195	208	150	161
3×70	3.4	55.5	4956	3681	0.268	0.443	240	260	185	201
3×95	3.4	59.5	5984	4214	0.193	0.32	290	317	225	245
3×120	3.4	63.2	6946	4713	0.153	0.253	325	365	255	283
3×150	3.4	66.5	8006	5251	0.124	0.206	370	417	285	323
3×185	3.4	70.8	9422	5975	0.0991	0.164	415	478	325	372
3×240	3.4	76.7	11455	6925	0.0754	0.125	485	563	380	439
3×300	3.4	82.2	13600	7916	0.0601	0.1	540	645	425	505
3×400	3.4	90.3	17555	10287	0.047	0.0778	620	749	490	593
3×500	3.4	98.5	21495	12163	0.0366	0.0605	-	-	-	-
3×630	3.4	106.9	26396	14326	0.0283	0.0469	-	-	-	-