JP4284599B2 - Operation device for suspended tunnel ventilator - Google Patents

Description

  The present invention relates to an operating device for a suspended tunnel ventilator installed in a tunnel called a jet fan or a booster fan.

  The suspended tunnel ventilator main bodies F11, F12, F13... Such as jet fans and booster fans shown in FIG. 3 are installed in a state of being suspended from the ceiling in the tunnel at an arbitrary interval. . The ventilation method of creating the same ventilation flow by operating the suspended tunnel ventilator and exhausting air from either end of the tunnel can reduce the equipment cost relatively, and the pressure loss occurs because the ventilation flow flows through the roadway. There are merits such as reducing the number of ventilators. In particular, when a large number of ventilators are installed in a long tunnel, fine control according to the traffic volume can be achieved by increasing or decreasing the number of ventilator operating units. It is a feature.

  In order to control many ventilators in one place, a ventilation power panel that supplies power to the ventilator via a power cable and a ventilator power source that controls the operation of the ventilator are installed in an electrical room outside the tunnel. . Since the ventilation power panel and each of the suspended tunnel ventilators F11, F12, F13... Are connected by a long power cable, each power cable L11, L12, L13. A voltage drop is caused by resistance, and the voltage of each suspended tunnel ventilator F11, F12, F13... Is lower than the supply voltage from the ventilation power panel by the voltage drop.

The voltage drop rate is set to 6% or less in the road corporation equipment specifications in order to perform normal operation.
If there is a ventilator near the tunnel entrance, the distance between the ventilation power panel installed in the electrical room installed outside the tunnel and the ventilator, that is, the power cable is short. The voltage drop of the type tunnel ventilators F11, F12, F13... Can be kept within a specified value. However, when the suspended tunnel ventilator is near the opposite end of the long tunnel, the distance between the suspended tunnel ventilator and the ventilation power panel becomes longer, and the same diameter as the power cable was used. Sometimes the voltage drop due to the line resistance of the power cable becomes large, and the voltage drop rate exceeds the specified value.

  This problem can be solved by thickening the power cable and reducing the line resistance, but widening the cross-sectional area of the cable not only increases the price of the long power cable itself, but also increases the size of the handhole. There is a problem that it is necessary and the construction cost becomes high.

  Therefore, as a means for solving this problem by using a power cable having a thickness that is conventionally used without using a thick power cable, Utility Model No. 2559677 discloses a box for storing a hand switch for power switching. Is proposed to reduce the voltage drop and power loss of the power cable by adjoining the main body of the suspended tunnel ventilator and housing and connecting the power factor improving capacitor therein.

  As shown in FIG. 4, that is, in the electric circuit diagram of the operating device of the suspended tunnel ventilators F11, F12, F13..., The present method uses the operation / stop device 11 to the electric motor M11 of the suspended tunnel ventilator. , M12, M13,... By installing power factor improving capacitors SC11, SC12, SC13,... Adjacent to the circuit breakers MB111, MB112, MB113,. It improves the rate and decreases the voltage drop rate.

  More specifically, as shown in the electric circuit diagram of the circuit breaker MB111 and the power factor improving capacitor SC1 in FIG. 5, the power factor improving purpose housed in the box 14 together with the circuit breaker MB111 and the terminal plate TB is shown. The capacitors C1 to C3 are individually connected in parallel with resistors R1 to R3, and the resistors R1 to R3 serve to discharge the capacitors C1 to C3. Capacitors C1 to C3 are provided for each phase and have the same capacity. For example, the capacitors C1 to C3 are for improving the power beyond 15 kVA, and are 125 to 200 μF. The resistors R1 to R3 have equal resistance values, and these resistors R1 to R3 may be omitted.

The hand switch box B11 is provided in the vicinity of the induction motor that drives the fan of the suspended tunnel ventilator F11. For maintenance of the suspended tunnel ventilator F11, the power source of the induction motor is opened and closed. By storing the power factor improving capacitors C1 to C3 in the vicinity, the imaginary component of the current I0 flowing in the operation / stop device 11 and the imaginary component of I1 flowing through the power cable L11, that is, the ineffective component is provided. It becomes possible to decrease.
Utility Model No. 2559677

  However, although the voltage drop can be suppressed by means of placing the conventional power factor improving capacitor adjacent to the ventilator body, the motor was turned off while the suspended tunnel ventilator was in operation. Since the voltage of the ventilator rises due to the self-excited phenomenon of the capacitor caused by the rotation of the fan due to inertia, the power factor improvement of about 95% had to be taken into consideration when considering the voltage rise. Therefore, in order to further improve the power factor, that is, to suppress the voltage drop rate, a method that does not cause the self-excitation phenomenon of the capacitor is required.

  In addition, according to the invention, the power factor improving capacitor is installed in the hand switch box adjacent to the circuit breaker attached to the side wall of the tunnel, so that it is damaged when a fire occurs in the tunnel, for example. There was a fear.

  The present invention solves the above-mentioned problem of suppressing voltage increase due to self-excited phenomenon associated with the opening and closing of a power supply for a suspended tunnel ventilator, and the above-mentioned problem of ensuring safety in the event of a fire in the tunnel. Therefore, it is intended to provide power factor improvement as close to 100% as possible and to maintain sufficient safety in the event of an emergency such as a fire.

  In order to solve the above-described problems, the operating device for a suspended tunnel ventilator according to the present invention has a power factor improving capacitor installed in the vicinity of the suspended tunnel ventilator installed in the tunnel, and the capacitor is inserted into the circuit. -It was decided to have an electric circuit consisting of a contactor that cuts off, a rectifier that excites the magnet coil of the contactor, a semiconductor switch, a current transformer for current detection, and a power cable connecting them.

  That is, immediately after turning off the electric power of the motor of the suspended tunnel ventilator, the suspended tunnel ventilator continues to rotate due to inertia, and even if the power is turned off, a current flows through the capacitor. On the other hand, when the electric power of the motor is turned off, since the detected current value flowing through the current transformer above the capacitor is 0, the semiconductor switch that controls the rectifier that excites the contactor is also turned off. To release. Therefore, by turning off the power supply of the motor, the circuit of the capacitor below the contactor is cut off, and the power supply can be switched on and off without being affected by the effect of the suspended tunnel ventilator rotating by inertia, that is, by the self-excitation phenomenon. Is possible.

In addition, there are multiple suspended tunnel ventilators installed in the tunnel connected to one power cable, each suspended tunnel ventilator has an electrical circuit installed, and power factor improvement By installing the electric circuit having a capacitor for each suspended tunnel ventilator, a voltage drop due to the line resistance of the power cable can be reduced.

  Furthermore, the operating device of the suspended tunnel ventilator according to the present invention can be opened and closed by installing electric circuit parts such as a power factor improving capacitor, a contactor, a rectifier, a current transformer and a power cable in the hand hole. Not only can the container box be made compact, but also in the event of a fire or the like in the tunnel, the conduction of heat to the electrical circuit can be lowered to increase safety in an emergency.

  According to the present invention, by providing a contactor above the power factor improving capacitor, a voltage rise due to the self-excitation phenomenon of the power factor improving capacitor that occurs when the power of the suspended tunnel ventilator that has been operated is turned off is prevented. A capacitor that can bring the voltage drop rate to 100% as much as possible can be used.

  Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing one preferred embodiment of the present invention. Each suspended tunnel ventilator F1, F2, F3... Is installed suspended from the ceiling in the tunnel with a predetermined interval in the longitudinal direction of the tunnel 12. The hand switch boxes B1, B2, B3... And the hand holes H1, H2, H3... Are installed adjacent to the respective suspended tunnel ventilators F1, F2, F3. .

  The circuit breaker MCB for the power source of the induction motor that drives the suspended tunnel ventilators F1, F2, F3,... Suspended from the ceiling 121 of the tunnel 12 includes adjacent hand switch boxes B1, B2. , B3... In the hand holes H1, H2, H3... Closest to the hand switch boxes B1, B2, B3..., The power factor improving capacitor SC and the contactor MC1 for turning on and off the capacitors are shown in FIG. A rectifier RF1 for exciting a magnet coil of the contactor, a semiconductor switch Tr for controlling the rectifier RF1, a current transformer CT for detecting current, and a power cable for connecting them are installed.

  A forward electromagnetic contactor MCF and a reverse electromagnetic contactor MCR connected from an AC power source are provided in the operation control device 11 for operating and stopping an electric chamber (not shown) provided at the entrance of the tunnel 12. In addition, power is supplied to the power cable L1 through the thermal relay TH for overload detection. The circuit breaker MCB is interrupted by the output of the current transformer CT when it is overloaded and when an accident occurs.

  The contactor MC1 is arranged in the circuit of the power factor improving capacitor SC installed below the wiring circuit breaker MCB. The excitation circuit of the contactor MC1 uses a nearby 100V power supply and creates a DC power supply via the rectifier RF1. A current switch CT is arranged above the circuit breaker MCB, a current flowing through the motor M of a suspended tunnel ventilator (not shown) is detected, rectified by RF2, and a semiconductor switch composed of transistors with this power supply The coil MC is excited by turning on Tr.

  When the power supply of the motor M of the suspended tunnel ventilator is turned off by the ventilator power supply MCF or MCR provided in the electric room, the current is cut off, so the current detection of the current transformer CT becomes 0 and the semiconductor switch Tr is turned off. To open the contactor MC1. On the other hand, in the electric motor M of the suspended tunnel ventilator, the fan keeps rotating due to inertia and causes a self-excitation phenomenon to flow current.

  However, in this embodiment, since the circuit is opened by the contactor MC1, the capacitor circuit is cut off, and the self-excitation phenomenon of the capacitor SC due to the rotation of the fan after the power is turned off is minimized. No rise will occur. Therefore, the power factor of the capacitor SC can be as close as possible to 100%.

  In addition, the internal electric circuits of the suspended tunnel ventilators F2, F3,..., The hand switch boxes B2, B3. That is, the circuit is opened by the contactors MC2, MC3,..., So that the capacitor circuit is cut off and the self-excitation phenomenon of the capacitor SC is prevented. Therefore, the power factor of the capacitor SC can be as close as possible to 100%. It becomes.

  Further, according to the embodiment of the present invention, the power factor improving capacitor SC, the contactors MC1, MC2, MC3..., The rectifier RF1, the semiconductor switch Tr, and the power cables L1, L2, L3.・ Installing in the hand holes H1, H2, H3... Allows only the circuit breaker in the hand switch box to be compact so that it can be made compact. Because it is installed inside, it is possible to prevent damages such as damage without receiving a direct disaster even in the event of an emergency such as a fire.

It is sectional drawing of the tunnel in which the apparatus of this invention is installed. It is an electric circuit diagram which shows the whole structure in this invention. 1 is a cross-sectional view of a tunnel where a prior art device is installed. It is an electric circuit diagram which shows the whole structure of a prior art. FIG. 5 is a detailed electric circuit diagram of a wiring breaker M111 and a power factor improving capacitor SC11 shown in FIG.

Explanation of symbols

11 Operation control device, 12 tunnel, F1-F3, F11-F13 suspended type tunnel ventilator, B1-B3, B11-B13 hand switch box, H1-H3 hand hole, L1-L3, L11-L13 power cable, 121 Ceiling

Claims (3)

A driving device of the installed suspended tunnel ventilation machine in the tunnel, in the operation device of the lower mold tunnel ventilator suspended consisting electrical circuit having a capacitor and a contactor for at least the power factor correction, the electrical circuit, the force A capacitor for rate improvement, a contactor disposed above the capacitor, a rectifier and a semiconductor switch for exciting the magnet coil of the contactor, a current transformer for detecting current, and a power cable connecting them. A suspended tunnel ventilator operating device.   The suspension type tunnel ventilator installed in the tunnel is a plurality of units connected to one power cable, and an electric circuit is installed in each suspension type tunnel ventilator. Lower tunnel ventilator operation device.   The operating device for a suspended tunnel ventilator according to claim 1 or 2, wherein the electric circuit is installed in a hand hole.

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