Cable heating system

 

(57) Abstract:

The invention relates to the field of electrical engineering, namely, electric heating systems used for space heating, roof, etc. and can be used as an element of built-in heating systems. The technical result from the use of this invention is the reduction of the electric component of the electromagnetic field in the space surrounding such a system, while improving its electrical safety. The invention consists in the following. The system contains unshielded insulated wire (1) over a conductive screen (3). Wire (1) is fixed relative to the plane of thermal screen (3) concrete screed (4). The ends of the wire (1) through the clutch (5) and (6) are connected with the first end of the wire (7) and (8), the second end of the first connecting wire (7) is connected to the output (9) neutral power line connected to the protective earth (10) According to the invention, the system has an input device (11) protection containing relay (12) current interruption, one end of the winding (13) which is connected to the output (8), and the other end (13) through a series circuit of a normally open contact group (14) relay (15) the control circuit is on the contact group (16) relay (12) current interruption is enabled, the button (18) system startup. In the sequential control circuit there is a current, a relay contact switches (15), the control circuit and contacts its normally open contact group (14) are closed. In the circuit of the winding (13) relay (12) current interruption occurs, the current flowing in the wire (1). This leads to the relay (12), contacts its normally open contact group (16) close and lock the system mode to force a break of the control circuit button (21) shutdown of the system. Pressing this button leads to de-energize winding (20) relay (15) of the control circuit. 2 Il.

The invention relates to electric heating systems used for space heating, roofing, road sections, etc., and can be used in construction as a design element built-in heating systems, for example, when the electric heating system in the concrete floor.

Known cable system for space heating (RF patent N 2121772, IPC 6 H 05 3/35, publ. 10.11.1998) containing electric heating cables, a device for temperature control, temperature-sensitive sensor, connecting cables and couplings. The cable system made in the form of at least one heating section, vklyuchavshego cable is connected, accordingly, one of the ends of the connecting cables and connections sealed in the couplings. The heating cable has a multi-layer insulation, covered with a shielding conductor connected to the grounded neutral. The surface of the shielding conductor is protected deposited on top of it is heat-resistant polymer shell.

The presence of the shielding conductor reduces induced heating cable the electromagnetic field to levels that do not exceed acceptable health standards, but such a construction of the heating cable increases the cost of the system.

Closest to the technical nature of the proposed system is cable of the heating system (see DE-VI "System price", N 14 (147), 1999), containing at least one solid non-shielded heating wire laid, for example, in the form of a meander, over heat-reflecting conductive surface (the screen), fixed in relation to the concrete screed and is connected to the power network is connected to its ends with couplings connecting wires.

However, such cable systems have an increased level of electromagnetic field strength in Pico for heating dry premises.

The technical object of the present invention is a decrease in the strength of the electric component of the electromagnetic field in the space surrounding the heating cable system, while improving its electrical safety for biological objects, i.e. improving the compatibility of such systems with biological objects.

The solution to this problem is achieved by the fact that the famous cable heating system containing at least one unshielded insulated heating wire over the conductive heat shield and fixed relative to the concrete screed at the ends of the heating wire through the coupling attached to the first ends of the connecting wires, the second end of the first connecting wire connected to the neutral output of the power network connected to the protective earth, equipped with an input protection device containing the relay current interruption, relay control circuit, each of which has a coil and normally open contact group, relays with low impedance winding and a normally closed contact group the start button and disconnected the cable heating system, with od winding of the relay interruption of current through the series circuit, consisting of normally open relay contacts of the control circuit and normally open relay contacts current interruption, is connected to the phase output of the power network and parallel to the normally open contact of the relay current interruption is enabled, the start button cable heating system, the connection point between the ends of the normally open relay contacts interruption of current, a normally open relay contacts of the control circuit and the start button cable heating system included one end of the winding of the relay control circuit, the other end of the winding of which is connected to the neutral output of the power network through a serial circuit, consisting of a mute button cable heating system and a normally closed contact relay with low impedance winding, which is connected between the neutral output of the power network and conductive heat shield.

The invention is illustrated by drawings, where Fig. 1 shows a cable of the heating system of Fig. 2 shows a section along a-A.

Cable heating system contains unshielded insulated heating wire 1 is placed, for example, in the form of a meander 2, pleskot is entrusted wire 1 is fixed relative to the plane of thermal conductive screen 3 concrete screed 4. The ends of the heating wire through the coupling 5 and 6 attached to the first ends of the connecting wires 7 and 8, the second end of the first connecting wire 7 is connected to the output 9 of the neutral power line connected to the protective earth 10.

Cable heating system has an input protection device 1 formed of the relay 12 current interruption, one end of the winding 13 which is connected to the second end of the second connecting wire 8 and the other end of this winding 13 through a serial circuit consisting of the normally open contact group 14 relay 15 of the control circuit and the normally open contact group 16 relay 12 current interruption, is connected to the phase output of 17 power line, parallel to the normally open contact group 16 relay 12 current interruption is enabled, the button 18 run cable heating system. In point 19 of the connection of the ends of the normally open contact group 16 relay 12 interruption of current, a normally open contact group 14 relay 15 of the control circuit and the button 18 run heating cable system is connected one end of winding 20 of relay 15 of the control circuit, the other end of the winding 20 which through a series circuit consisting of buttons 21 limit ATCU 24, connected to the neutral output 9 of the power network, and the low-resistance winding 24 of the relay 23 is positioned between the neutral output 9 of the power network and conductive heat shield 3.

Cable heating system works as follows.

Pressing the button 18 run cable heating system its normally open contacts are closed and the supply voltage from the power network is fed through the phase and neutral inputs 17 and 9, the contact button 18 to the serial control circuit consisting of a coil 20 of the relay 15 of the control circuit, the normally closed contact buttons 21 disconnect cable heating system and a normally closed contact group 22 relay 23. In the sequential control circuit current occurs, it triggers the relay 15, and contacts its normally open contact group 14 are closed. In the circuit of the winding 13 relay 12 current interruption occurs, the current flowing through the unshielded insulated heating wire 1. The emergence of the current in the winding 13 relay 12 current interruption leads to its actuation, contacts its normally open contact group 16 are closed and fixed operating mode heating cable system until forced break Inoi heating system leads to de-energize coil 20 of the relay 15 of the control circuit, the relay, 15 of the control circuit and thus opening its normally open contact group 14, which de-energizes the coil 13 of the relay 12 current interruption, the fire and the break contacts of its normally open contact group 16 that this is fixed in the open state.

The heat from the current flow over unshielded insulated heating wire 1 through the concrete floor 4, reflected from thermal conductive screen 3 will be transmitted into the air, for example, heated premises.

Under normal insulation unshielded insulated heating wires 1 current in conductive thermal screen 3, as a circuit in which it is included, is not closed. Because conductive heat shield 3 is connected through a low impedance energized winding 24 of the relay 23 to the neutral output 9 of the power network, it is an equipotential surface with zero potential. The effect of reducing the electric component of the electromagnetic field in the space above the concrete coating 4 is achieved as a result of changes in the structure of the electric field in space. Indeed, isolated from the neutral output 9 of the power network pravozascitnogo influence on the electromagnetic field cable heating system. When zanolini same thermal conductive screen 3, he, even at a small thickness, acquires the function of the electric screen, as each section of heating cable system between unshielded insulated heating wire 1 and the conductive heat shield 3 applied potential difference. At the industrial frequency of 50 Hz electric component of the quasistatic electric field in each cross-section unshielded insulated heating wires 1, mainly concentrated in the space between it and the screen (by analogy with the field of the conductor on the conductive surface). The value of the electric field intensity in the space over unshielded insulated heating wire 1 is reduced. Thus, when the value of the gap is within 10 mm between unshielded insulated heating wire 1 and the conductive heat shield 3 is made of an aluminum foil with a thickness of 0.1 mm, the magnitude of the electric field in the space above unshielded insulated heating wire 1 is reduced by 3-7 times.

Ensure electrical safety cable heating systems, obrazovanii and snapping it on conducting the heat shield 3 is the current growth in the low-resistance winding 24 of the relay 23, which works, its normally closed contact group 22 is opened, the coil 13 of the relay 12 current interruption is de-energized, its contact group 16 is opened and fixed in this state. Is emergency shutdown cable heating systems from phase input 17 of the power network.

Protective shutdown cable heating system from the power network when the cliff into the unshielded insulated heating wire 1 is relay 12 current interruption, the disappearance of the current in the winding 13 which trigger its normally open contact group 16, lockable in the open condition. When this occurs, emergency shutdown cable heating systems from phase input 17 of the power network.

The touch of the user by performing a thermal screen 3 safely as in the case of low impedance energized winding 24 of the relay 23 due to the fact that conductive heat shield 3 has the potential protective grounding 10, regardless of the resistance value of the low resistance winding 24, and in emergency mode - when the circuit unshielded insulated heating wires 1 at conducting heat shield 3 due to the low resistance conducting the t function protective earth as connected to the output 9 of the neutral power line connected to the protective earth 10.

Isolation unshielded insulated heating wires 1 may be made in the form of heat-resistant polymer shell and the coupling 5 and 6 are made of a material of similar chemical composition.

The device can be used in conjunction with the standard unit of temperature control that contains the temperature sensor, the switching element and the programmer specifies the optimal regulatory regime. When this mechanical start button 18 and disconnected the cable 21, the heating system should be replaced with electronically-controlled counterparts.

This cable heating system provides electrical safety and electromagnetic compatibility with biological objects when installed in a residential area, and a uniform temperature distribution over the height of the room, similar to the more expensive cable heating systems, made of shielded heating wires.

Cable heating system containing at least one unshielded insulated heating wire telego wires through the coupling attached to the first ends of the connecting wires, the second end of the first connecting wire connected to the neutral output of the power network connected to a protective earthing connection, characterized in that it is equipped with an input protection device containing the relay current interruption, relay control circuit, each of which has a coil and normally open contact group, relays with low impedance winding and a normally closed contact group button startup and shutdown cable heating systems, with one end of the winding of the relay current interruption is connected to the second end of the second connecting wire, and the second end of the winding of the relay interruption of current through the series circuit, consisting of normally open relay contacts of the control circuit and normally open relay contacts current interruption, is connected to the phase output of the power network and parallel to the normally open contact of the relay current interruption is enabled, the start button cable heating system, the connection point between the ends of the normally open relay contacts interruption of current, a normally open relay contacts of the control circuit and the start button cable heating system included one end of the winding of the relay control circuit, the other is Yu from the mute button cable heating system and a normally closed contact relay with low impedance winding, which is included between the neutral output of the power network and conductive heat shield.

 

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