Feed switch voltage-loss delay device for coal mine local fan

Abstract

The utility model belongs to the technical field of coal mine underground local fan power supply, and solves the problem that when a power grid fluctuates or a superior power supply suddenly loses power, local fan feed can be switched off due to protection action, and manual operation is needed for power transmission after power is obtained, so that the local fan stops running. The utility model provides a feed switch no-voltage delay device for a coal mine local fan. A coil of a power-on delay relay ST6P and a coil of a power-off delay relay ST3P are arranged in parallel and are connected with the positive electrode and the negative electrode of a 127V power supply; a power-off time-delay normally-closed contact ST3P-1 of the power-off time-delay relay ST3P is connected in series with a no-voltage coil Q3 and then is connected in parallel with a capacitor C2; two ends of the capacitor C2 are respectively connected with a terminal 2 and a terminal 4 of a rectifier bridge D3; and one end of a power-on delay normally open contact ST6P-1 of the power-on delay relay ST6P is connected with a 55V power supply, and the other end of the power-on delay normally open contact ST6P-1 is connected with a terminal, connected with the trip coil Q2, on the feed protector. The device can avoid the phenomenon of unplanned wind stopping and power failure accidents of the underground local fan under the conditions of power grid fluctuation and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply for local ventilators in coal mines, and in particular relates to a voltage loss delay device for a feed switch used for local fans in coal mines. Background Art

[0002] The power supply mode of local ventilation fans in coal mines is generally a dedicated transformer - feeder switch - starter - local ventilation fan. If there is a grid fluctuation or a sudden power failure of the upper power supply, but the upper power supply electrical equipment can be quickly switched or powered quickly in a short time by other means, the local fan feeder and starter will be tripped due to protection action, resulting in the shutdown of the local ventilation fan, or the accident will be aggravated due to untimely power supply, resulting in unplanned ventilation stoppage, power outage or gas over-limit and other accidents. Utility Model Content

[0003] In order to solve at least one of the above technical problems existing in the prior art, the utility model provides a voltage loss delay device for a feeder switch used for a local fan in a coal mine.

[0004] The utility model is implemented by the following technical scheme: a power supply switch pressure-loss delay device for a coal mine local fan, comprising a power-on delay relay ST6P, a power-off delay relay ST3P and a capacitor C2; the coil of the power-on delay relay ST6P and the coil of the power-off delay relay ST3P are arranged in parallel and connected to the positive and negative poles of a 127V power supply; the power-off delay normally closed contact ST3P-1 of the power-off delay relay ST3P is connected in series with the pressure-loss coil Q3 and then connected in parallel with the capacitor C2, and the two ends of the capacitor C2 are respectively connected to the terminals 2 and 4 of the rectifier bridge D3; one end of the power-on delay normally open contact ST6P-1 of the power-on delay relay ST6P is connected to the 55V power supply, and the other end is connected to the terminal connected to the tripping coil Q2 on the feed protector.

[0005] Preferably, both ends of the coil of the power-on delay relay ST6P and the coil of the power-off delay relay ST3P are connected to the 127V power supply via terminals 5 and 6 of the Phoenix terminal 6P; capacitor C2 is connected to the power-off delay normally closed contact ST3P-1 via terminal 2 of the Phoenix terminal 6P, and the power-off delay normally closed contact ST3P-1 is connected to the undervoltage coil Q3 via terminal 1 of the Phoenix terminal 6P; the 55V power supply is connected to the power-on delay normally open contact ST6P-1 via terminal 3 of the Phoenix terminal 6P, and the power-on delay normally open contact ST6P-1 is connected to the feeder protector via terminal 4 of the Phoenix terminal 6P.

[0006] Preferably, the power-on delay normally open contact ST6P-1 is connected to the 9# terminal on the feeder protector, and a relay for controlling the on / off of the circuit where the trip coil Q2 is located is connected between the 9# terminal and the trip coil Q2.

[0007] Preferably, the 127V power supply is taken from the feed switch door panel T2 transformer.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] The local fan feed switch is equipped with a delay device on the basis of ensuring the original various protection functions. When the power grid fluctuates or the upper power supply suddenly loses power, the local fan feed is not disconnected and is quickly powered on, ensuring the continuous power supply of the local fan feed, thereby ensuring the reliable operation of the local ventilator. It can avoid the phenomenon of unplanned power outages of underground local fans due to power grid fluctuations, etc., and improve the air supply safety of the underground excavation working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 This is the wiring schematic diagram of this device;

[0012] Figure 2 This is the schematic diagram of the feed switch. DETAILED DESCRIPTION

[0013] Combined with the drawings in the embodiments of the utility model, the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0015] The utility model provides an embodiment:

[0016] like Figure 1 , Figure 2 As shown, a power supply switch undervoltage delay device for a coal mine local fan includes a power-on delay relay ST6P, a power-off delay relay ST3P and a capacitor C2; the coil of the power-on delay relay ST6P and the coil of the power-off delay relay ST3P are arranged in parallel and connected to the positive and negative poles of a 127V power supply; the power-off delay normally closed contact ST3P-1 of the power-off delay relay ST3P is connected in series with the undervoltage coil Q3 and then connected in parallel with the capacitor C2, and the two ends of the capacitor C2 are respectively connected to the terminals 2 and 4 of the rectifier bridge D3; one end of the power-on delay normally open contact ST6P-1 of the power-on delay relay ST6P is connected to the 55V power supply, and the other end is connected to the terminal on the feed protector connected to the trip coil Q2.

[0017] In this embodiment, the two ends of the coil of the power-on delay relay ST6P and the coil of the power-off delay relay ST3P are connected to the 127V power supply through the terminals 5 and 6 of the Phoenix terminal 6P; the capacitor C2 is connected to the power-off delay normally closed contact ST3P-1 through the terminal 2 of the Phoenix terminal 6P, and the power-off delay normally closed contact ST3P-1 is connected to the undervoltage coil Q3 through the terminal 1 of the Phoenix terminal 6P; the 55V power supply is connected to the power-on delay normally open contact ST6P-1 through the terminal 3 of the Phoenix terminal 6P, and the power-on delay normally open contact ST6P-1 is connected to the feeder protector through the terminal 4 of the Phoenix terminal 6P. The power-on delay normally open contact ST6P-1 is connected to the 9# wiring terminal on the feeder protector, and a relay that controls the on and off of the circuit where the tripping coil Q2 is located is connected between the 9# wiring terminal and the tripping coil Q2.

[0018] The feeder switch uses the KBZ20-400 (200) / 1140 (660) type feeder produced by Bada Electric. Through technical transformation of the local fan feeder switch, that is, the local fan feeder switch is equipped with a voltage loss delay device (adjustable from 1 to 5 seconds) on the basis of ensuring the original various protection functions. When there is a grid fluctuation or a sudden power failure of the upper power supply, the local fan feeder will not be disconnected and will be energized quickly, ensuring the continuous power supply of the local fan feeder, thereby ensuring the reliable operation of the local ventilator.

[0019] Improvement content: Take 127V power supply from the feed switch door panel T2 transformer, connect it to ST6P power-on delay relay and ST3P power-off delay relay through Phoenix terminal 6P, and connect 3300uF / 160V capacitor to the pressure loss coil Q3. Specific improvements and wiring content are as follows:

[0020] Wiring method: Reference Figure 1

[0021] The tinned end of the wire configured for the delay device is connected to the 6-core wiring port of Phoenix terminal 6P according to the markings on the wiring diagram, and then the No. 65 line of the feed switch door plate T2 transformer on the schematic diagram of the feed switch is removed from the wiring port and the No. 65-1 line of the delay circuit is connected to the original port, and the removed No. 65 line is connected to the No. 65 line of the delay circuit wire; the No. 41 and No. 44 wires of the delay circuit are connected to the No. 41 and No. 44 ports of the feed switch door plate T2 transformer; the No. 51 line of the No. 51 line port of the rectifier circuit board where the rectifier bridge D3 is located on the feed switch body is removed, and the No. 51 line of the delay circuit is connected to the No. 51 port of the rectifier circuit board, and then the removed No. 51 line is connected to the No. 51-1 line of the delay circuit;

[0022] Debugging method:

[0023] After power is turned on, the protector is connected to the power supply and it shows that everything is normal;

[0024] When the feed switch is powered on, capacitor C2 is charged. The power supply is disconnected after about 1 minute. Power is restored within 5 seconds after the power failure. The feed switch does not trip, which means that the delay function is normal. If you need to change the delay time, you can adjust the delay adjustment knob on the shell in a counterclockwise direction to reduce the delay time. The delay time of this series of delay circuits is set at 5 seconds.

[0025] Principle description: Reference Figure 2

[0026] After the delay device is installed on the feed switch, when power is supplied, the feed switch operates normally and the newly added capacitor C2 is charged.

[0027] When loss of pressure or undervoltage occurs and the switch is opened, the newly added capacitor C2 discharges the loss of pressure coil Q3 to maintain the attraction. The discharge and attraction time of capacitor C2 is controlled by the ST3P power-off delay relay. In this embodiment, the delay time is 5 seconds. At the same time, it is ensured that the ST3P power-off delay relay will be actuated if there is no power after 5 seconds. The power-off delay normally closed contact ST3P-1 is disconnected, the discharge circuit is opened, and the loss of pressure coil Q3 causes the feed switch to be reliably opened.

[0028] When the power is supplied within 5 seconds, for the feeder switch without delay device, due to the inherent function of the feeder protector, the relay between contacts 9-18 in the feeder protector will jitter instantly (close and then separate), which mainly serves to supply power to the trip coil Q2 at the moment of closing, ensuring that the feeder switch is in the open state;

[0029] After installing the delay device, disconnect the No. 65 line in front of the 9# terminal of the feeder protector, and connect the power-on delay relay ST6P in series. At the moment of power-on, the circuit where the power-on delay normally open contact ST6P-1 of the power-on delay relay ST6P is located is in an open circuit state, which avoids the action of the relay between the 9-18 contacts. The trip coil Q2 is not energized, and the feeder switch will not open, but remain in the closed state, and the under-voltage delay device works.

[0030] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A voltage-loss delay device for a feed switch used in a coal mine local fan, characterized in that: It includes a power-on delay relay ST6P, a power-off delay relay ST3P and a capacitor C2; the coil of the power-on delay relay ST6P and the coil of the power-off delay relay ST3P are arranged in parallel and connected to the positive and negative poles of a 127V power supply; the power-off delay normally closed contact ST3P-1 of the power-off delay relay ST3P is connected in series with the undervoltage coil Q3 and then in parallel with the capacitor C2, and the two ends of the capacitor C2 are respectively connected to the terminals 2 and 4 of the rectifier bridge D3; one end of the power-on delay normally open contact ST6P-1 of the power-on delay relay ST6P is connected to a 55V power supply, and the other end is connected to the terminal on the feed protector connected to the trip coil Q2.

2. A voltage loss delay device for a feed switch for a local fan in a coal mine according to claim 1, characterized in that: The two ends of the coil of the power-on delay relay ST6P and the coil of the power-off delay relay ST3P are connected to the 127V power supply via terminals 5 and 6 of the Phoenix terminal 6P; the capacitor C2 is connected to the power-off delay normally closed contact ST3P-1 via terminal 2 of the Phoenix terminal 6P, and the power-off delay normally closed contact ST3P-1 is connected to the undervoltage coil Q3 via terminal 1 of the Phoenix terminal 6P; the 55V power supply is connected to the power-on delay normally open contact ST6P-1 via terminal 3 of the Phoenix terminal 6P, and the power-on delay normally open contact ST6P-1 is connected to the feeder protector via terminal 4 of the Phoenix terminal 6P.

3. The voltage loss delay device for a feeder switch for a local fan in a coal mine according to claim 1, characterized in that: The power-on delay normally open contact ST6P-1 is connected to the 9# terminal on the feeder protector, and a relay for controlling the on / off of the circuit where the trip coil Q2 is located is connected between the 9# terminal and the trip coil Q2.

4. A voltage loss delay device for a feeder switch for a local fan in a coal mine according to claim 1, characterized in that: The 127V power supply is taken from the T2 transformer on the feeder switch panel.

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