What Is a Digital Cable Signal?
The signal cable is a signal transmission tool. Generally, the signal transmitted by the signal cable is very small. In order to avoid signal interference, there is a layer of shielding on the outside of the signal cable. The shielding layer of the wrapped conductor is generally conductive cloth, woven copper mesh or copper (aluminum). The shielding layer needs to be grounded. External interference signals can be introduced into the ground by this layer to prevent interference signals from entering the inner layer of the conductor and reduce the loss of transmitted signals.
- The sensor signal cable is used for signal transmission of various sensors and instruments.
- The sensor signal cable uses a silver-plated conductor and a multi-core structure to ensure that the resistance between each core remains highly consistent, and can accurately transmit weak electrical signals to hundreds of meters away [1]
- The sensor signal cable problem uses tinned or silver-plated conductors.
- The sensor signal cable has four layers of protection, which are insulation, shielding, winding, and sheath, just to ensure the accurate transmission of weak electrical signals.
- Insulation layer: Physical and chemical properties equivalent to the sheath layer. In a small environment, the sheath, shielding net and winding layer can be removed and used as a separate wire.
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- 1.Signal cable mainly refers to railway dedicated signal cable, which is suitable for the control circuit of railway digital signal, audio signal or automatic signal device with rated voltage AC 500V or DC 1000V and below.
- 2. Product technical standards:
- TB / T2476-1993 railway signal cable
- TB / T3100.1 .5-2004 Railway Digital Signal Cable
- Q / JTL051.33-2001 Comprehensive shielded signal cable
- 3. The main models are:
- Railway signal cables, railway comprehensive sheathed signal cables, railway aluminum sheathed signal cables, railway digital signal cables, railway shielded digital signal cables, railway axle counting signal cables, railway transponder data transmission cables.
- 4. Railway signal cable characteristics:
- The ambient temperature of the cable is -45 + 60 , and the ambient temperature for laying is not lower than -10 . The long-term operating temperature of the cable conductor should not exceed 70 ° C. The aluminum sheathed cable has good shielding performance, and the comprehensive sheath has a certain shielding performance, which can be used in the main line of railway electrified sections or in areas with strong electric interference. The bending radius of the cable is not less than 15-20 times the outer diameter.
- 5. The signal cable specifications are:
- 4, 6, 8, 9, 12, 14, 16, 19, 21, 24, 28, 30, 33, 37, 42, 44, 48, 52, 56, 61.
- 4 cores minimum, 61 cores maximum
- 6. Product Features
- Railway digital signal cable has the function of transmitting analog signal (1MHz), digital signal (2Mbit / s), rated voltage AC 750V or DC 1100V and below system control information and electrical energy transmission function. It is suitable for the transmission of control information, monitoring information, and other related signal equipment and control devices such as railway signal automatic blocking systems, axle counting, station code, computer interlocking, microcomputer monitoring, dispatch centralization, dispatch supervision, high-power electric switch machines, and other related signal equipment and control devices. Electrical energy [2]
- MHY32 (PUYV39, PUYV39-1) Mine polyethylene insulated flame-retardant PVC sheathed single layer steel wire armored mine shaft signal cable
- Used as main signal cable in inclined or vertical shaft
- MHYVRP (PUYVRP) mine-used polyethylene insulated flame-retardant PVC sheathed copper wire braid shielded soft mine signal cable
- Used as mine signal cable in underground mine or inclined mine
- MHYVP (PUYVP) Mine Polyethylene Insulated Flame Retardant PVC Sheath Copper Wire Braid Shielded Mine Signal Cable
- Field cooperation mine signal cable with large electromagnetic interference downhole
- MHYVR (PUYVR) Mine polyethylene insulated flame-retardant PVC sheathed soft mine signal cable
- Used for signal cables in underground or inclined lanes
- MHYV (1 × 2 2 × 2 1 × 4 5 × 2) × 7 / 0.28 Polyethylene insulated PVC sheathed mine signal cable for coal mine
- For flat alleys and mechanical and electrical chambers
- MHJYV 4 / 0.28 copper wire + 3 / 0.28 steel wire 1 × 2 2 × 2 reinforced core polyethylene insulated PVC sheathed signal cable for coal mine
- For flat and inclined lanes with high mechanical damage
- (1) Seven direction box (HF-7)
- There are 1 inlet and 7 outlets, and 7 terminal boards can be installed inside (up to 11 can be added at most). Each terminal board has 7 terminals, which are used to connect the trunk cable and branch cable.
- (2) Four-direction box (HF-4)
- There are 1 inlet and 4 outlets, and 4 6-post terminal boards can be installed inside. Each terminal board has 7 terminals, which are used for the connection of the trunk cable and the branch cable.
- The signal transformer box can be used to connect signal equipment, the second is to place transformers and other equipment, and the third is to achieve cable relay and branching. It is generally used at the entrance signal station, exit station and shunting signal station, and the sending and receiving ends of the track circuit. There are two types of signal transformer box: XB1 and XB2. XB1 type has 4 lead-in (out) holes, which can hold 14 terminal boards inside, each terminal board has 2 terminals. XB2 type has 5 lead-in (out) holes, which can hold 18 terminal boards inside, and each terminal board has 2 terminals.
- The terminal cable box is located at the end of the cable and is used to connect signal equipment. There are three types of terminal cable boxes: HZ-24, HZ-12, and HZ0.
- HZ-24 type cable box has one cable lead-in hole and one cable lead-out hole, which can be used for cable relay. A small transformer of type BZ4 can be placed inside, and four 6-post terminal boards, that is, 24 terminals can be installed. Device connection.
- HZ-12 type cable box has only one cable lead-in hole, that is, it can't enter or exit. Two 6-post terminal boards, that is, 12 terminals, can only be used at the end of the cable.
- HZ0 type cable box does not have a terminal board inside, it can only be installed on the sending and receiving end of the track circuit, used to realize the connection between the cable and the lead wire of the rail.
- The selection of cable terminal connection equipment corresponding to various signal equipment can be found in the table.
- When selecting, pay attention to the number of cable cores and the number of cable protection tubes, the capacity of the built-in equipment and terminal board [3] .