JP2006109560A - Main circuit device in power generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the footprint of a main circuit apparatus in a pumping hydroelectric power station. <P>SOLUTION: A contact switch of an electric brake disconnector 3a is accommodated and disposed in an enclosure of a phase separation bus 10, and a contact switch of a starting disconnector 4b is accommodated and disposed in the enclosure of a phase separation bus 11 between a power generator and a circuit breaker 1a of the power generator. Similarly, the contact switch of the starting disconnector 4b is accommodated in an enclosure of a phase separation bus 12. Three phases have the identical height in a phase separation bus 13 by bending the phases on both ends. A contact switch of a grounding switch 5a is accommodated in the enclosure of the phase separation bus 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a generator main circuit device used in a pumped hydropower plant that switches a generator to an electric motor during pumping, and relates to the arrangement configuration thereof.

  In recent years, demand for electric power has been increasing, and power plants are required to operate efficiently. For this reason, pumped-up hydroelectric power plants are widely used as power plants that exhibit excellent efficiency.

  On the other hand, power plant construction places importance on environmental harmony, and its buildings are required to be designed not to harm the surrounding aesthetics or the environment, and the power plant structure is often a tunnel structure or an underground structure. For a power plant having such a structure, a smaller installation area is desirable because of lower construction costs.

  Conventionally, since the generator main circuit device constituting the generator main circuit is installed independently, the installation space is large. However, there is a proposal to reduce the arrangement space of the switching disconnector as described in Patent Document 1 while reduction of the installation area is desired.

JP-A H10-112906

  Conventional generator main circuit equipment has a large installation area because each equipment is installed as a single unit, and the construction cost has been increased in a tunnel-type power plant. In Patent Document 1, the space of the main circuit device other than the disconnector is not considered.

  An object of the present invention is to provide a generator main circuit device having a small installation area and excellent in economic efficiency by adopting an optimal arrangement configuration in a pumped-type hydroelectric power plant in view of the problems of the above-described conventional technology. There is to do.

  In order to achieve the above object, the present invention is used in a pumped hydropower plant that switches a generator to an electric motor at the time of pumping, and a phase inversion disconnector that performs phase-sequence conversion switching between a generator breaker and a generator main circuit. In the generator main circuit device provided with the above, the contact opening / closing part of the generator main circuit device is housed in an enclosure of phase separation bus conductor. The contact switching part is directly attached to the phase separation bus conductor.

  A part of the generator main circuit device is an electric brake disconnector and an activation disconnector, and the electric brake disconnector is located below the phase separation bus at substantially the same position as the phase separation bus. The start-up disconnector is arranged above the phase separation bus or arranged with its upper and lower sides reversed.

  Alternatively, a part of the generator main circuit device is a ground switch, and bends both ends of a phase separation bus connected between the main transformer side and the phase inversion disconnector so as to have the same three-phase height, A contact switching part of the ground switch is accommodated in an enclosure of the phase separation bus.

  Further, according to the present invention, a part of the generator main circuit device is an electric brake disconnector and a starter disconnector, and a contact opening / closing portion of the electric brake disconnector is directly attached to a phase separation bus conductor. It is housed in an enclosure, and a contact opening / closing portion of the start disconnector is directly attached to a phase separation bus conductor, and the phase separation bus conductor is housed in an enclosure of a generator breaker.

  According to the present invention, since the generator main circuit equipment employed in the pumped hydropower plant has an arrangement configuration with a small installation area, there is an effect that the installation area is small and the economy is excellent.

  First, the operation method of the pumped hydropower plant will be described. Fig. 1 is a single line connection diagram of the main circuit bus of a general pumped hydropower plant. When operating as a generator, the circuit breaker 1 is “open”, the phase reversal disconnector 2 is “closed”, the turbine is turned and the generator is started, and the magnitude and phase of the system voltage and generator voltage are synchronized. Insert the circuit breaker 1 and insert it into the system. When stopping the generator, the circuit breaker 1 is turned off, the electric brake disconnector 3 is turned on, and the three phases are forcibly short-circuited to convert electric energy into heat energy and apply the brake.

When operating as a pumping motor, with the circuit breaker 1 “open” and the phase reversal disconnector 2 switched on by phase-sequence conversion, the generator-side start-up disconnector 4 is turned on and the thyristor start-up power supply is turned on. The power supply with the two-phase sequence reversed is received and the generator is gradually rotated as an electric motor. There is a thyristor activation method in which when the required number of revolutions is reached, the thyristor activation power supply is stopped, the activation disconnector 4 is turned off, and the circuit breaker 1 is turned on. In addition, when there are two generators, the start-up disconnector 4 on the main transformer side on the generator side is turned on, and the generator-side start-up disconnection side on the side used as the pumping motor from the start-up disconnector There is a synchronous start system that receives power through the device 4 and starts the motor.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 2 is an arrangement configuration diagram of the generator main circuit device showing an example of the embodiment of the present invention. The generator breaker 1a is connected to the phase separation buses 11 and 12. Between the generator and the generator breaker 1a, the contact opening / closing part of the electric brake disconnector 3a is housed in the enclosure of the phase separation bus 10, and the contact opening / closing part of the start disconnector 4b is housed in the enclosure of the phase separation bus 11 respectively. Have been placed.

  3 and 4 show the AA cross-sectional view and the BB cross-sectional view of FIG. 2, and show the internal structures of the electric brake disconnect switch contact opening / closing portion 3a 'and the starting disconnect switch contact opening / closing portion 4a'. (A) shows a closed circuit state, and (b) shows an open circuit state.

  The fixed contact bases 9 and 9a are integrated with the phase-separated bus conductors 21 and 22, and the fixed contact pieces 6 and 6a are attached to the fixed contact bases 9 and 9a. The current collectors 7 and 7a are fixed by supporting insulators 8 and 8a attached to the phase separation bus enclosures 31 and 32, respectively. As a result, the electric brake disconnect switch contact opening / closing part 3a 'and the starting disconnect switch contact opening / closing part 4a' can be directly attached to the phase-separated bus conductors 21 and 22, and can be accommodated in the bus enclosures 31 and 32.

  A phase reversal disconnector 2a that performs phase-sequence conversion switching between the generator breaker 1a and the generator main circuit with one device is connected by a phase separation bus 12. As in FIG. 4, the contact opening / closing portion of the start disconnector 4b is housed in the enclosure of the phase separation bus 12, and is installed between the generator breaker 1a and the phase reversal disconnector 2a.

  The phase separation bus 13 connected between the main transformer side and the phase inversion disconnector 2a has the same height of the three phases by bending the phases at both ends. As a result, the contact switching part of the ground switch 5a is accommodated in the enclosure of the phase separation bus 13, and is arranged between the main transformer side and the phase inversion disconnector 2a.

  FIG. 5 is a cross-sectional view taken along the line CC of FIG. 2 and is an internal structure diagram of the ground switch contact switching part 5a '. The fixed contact base 9b has an integral structure with the phase separation bus conductor 23, and the fixed contact 6b is attached to the fixed contact base 9b. The current collector 7b is fixed and electrically connected to the grounded phase-separated bus enclosure 33. As a result, the ground switch contact opening / closing part 5 a ′ is directly attached to the phase separation bus conductor 23 and can be accommodated in the bus enclosure 33.

  With the arrangement configuration of this embodiment, the installation area of the generator main circuit device can be reduced. Depending on the configuration of the hydroelectric power plant, the positions of the electric brake disconnect switch 3a, the start disconnect switch 4a, and the grounding switch 5a can be turned upside down.

  FIG. 6 is an arrangement configuration diagram of a generator main circuit device showing another embodiment. The generator breaker 1b is connected to the phase separation buses 14 and 15. The contact opening / closing part of the electric brake disconnect switch 3b is placed on the lower side and the contact opening / closing part of the starting disconnect switch 4c is placed on the upper side in the same vertical position in the enclosure of the phase separation bus 14 connected to the generator breaker 1b. Is housed.

  FIG. 7 is a cross-sectional view taken along the line DD of FIG. 6 and is an internal structural diagram of the electric brake disconnect switch contact opening / closing portion 3b 'and the starting disconnect switch contact switching portion 4c'. With respect to the phase separation bus conductor 24, the electric brake disconnector fixed contact base 9c is integrated on the lower side, and the starting disconnector fixed contact base 9d is integrated on the upper side. The fixed contacts 6c and 6d are attached to the respective fixed contact bases 9c and 9d. The current collectors 7c and 7d are fixed by support insulators 8b and 8c attached to the phase separation bus enclosure 34.

  As a result, the electrical brake disconnecting switch contact opening / closing part 3b 'and the starting disconnecting switch contact opening / closing part 4c' are directly attached to the phase-separated bus conductor 24, accommodated in the bus enclosure 34, and arranged in the same vertical position. Is possible. The electric brake disconnector 3b and the starter disconnector 4c can be changed in the vertical position depending on the configuration of the power plant.

  A phase inversion disconnector 2b that performs phase-sequence conversion switching between the generator breaker 1b and the generator main circuit with one device is connected to the phase separation bus 15. The contact switching part of the starting disconnector 4d is housed in the enclosure of the phase separation bus 15 and is disposed between the generator breaker 1b and the phase inversion disconnector 2b.

  The phase separation bus 16 connected between the main transformer side and the phase inversion disconnector 2b has the same height as the three phases by bending the phases at both ends. Thereby, the contact switching part of the earthing switch 5b is accommodated in the enclosure of the phase separation bus 16, and is arranged between the main transformer side and the phase inversion disconnector 2b.

  By arranging as in the present embodiment, the installation area of the generator main circuit device can be further reduced as compared with the first embodiment.

  FIG. 8 is an arrangement configuration diagram of a generator main circuit device according to still another embodiment. The generator breaker 1c is connected to the phase separation buses 17 and 18. The contact opening / closing part of the electric brake disconnector 3c is housed in the enclosure of the phase separation bus 17, and is disposed between the generator and the generator breaker 1c. The contact switching parts of the start disconnectors 4e and 4f are housed in the enclosure of the generator breaker 1c.

  9A and 9B are internal structural views of the start-up disconnector contact opening / closing part. FIG. 9A is an enlarged view of the start-up disconnector contact opening / closing part. Fixed contacts 6e and 6f are attached to the phase separation bus main circuit conductors 25 and 26, respectively. The current collectors 7e and 7f are fixed by supporting insulators 8d and 8e attached to the generator breaker enclosure 51. As a result, the start disconnecting switch contact opening / closing portions 4e 'and 4f' are directly attached to the phase separation buses 25 and 26, and the buses can be stored in the enclosure 51 of the generator breaker.

  FIG. 10 shows another example of the start disconnecting switch contact opening / closing portion 4e'4f '. Fixed contacts 6g and 6h are attached to the phase separation bus main circuit conductors 27 and 28, respectively. Support insulators 8g and 8f are attached to the generator breaker enclosure 52 to support the current collectors 7g and 7f. As a result, the start disconnecting switch contact opening / closing portions 4e 'and 4f' are directly attached to the phase separation bus, and the bus can be accommodated in the enclosure 52 of the generator breaker. In this case, the operating device of the start-up disconnector is housed in the generator breaker control box and can be collectively operated on the front surface of the generator breaker.

  A phase inversion disconnector 2c that performs phase-sequence conversion switching between the generator breaker 1c and the generator main circuit with one device is connected to the phase separation bus 18. The phase separation bus 19 connected between the main transformer and the phase inversion disconnector 2c has the same height as the three phases by bending the phases at both ends. As a result, the contact switching part of the ground switch 5c is housed in the enclosure of the phase separation bus 19, and is disposed between the main transformer and the phase inversion disconnector 2c.

  With the arrangement configuration of the present embodiment, the installation area of the generator main circuit device can be further reduced as compared with the second embodiment.

Connection diagram of the main circuit bus of the pumped hydropower plant. The arrangement block diagram of the generator main circuit apparatus by Example 1 of this invention. The internal structure figure of the electric brake disconnector by the AA sectional view of FIG. FIG. 3 is an internal structural diagram of the start disconnector according to the BB cross-sectional view of FIG. The internal structural figure of the earthing switch by CC sectional drawing of FIG. The arrangement block diagram of the generator main circuit apparatus by Example 2 of this invention. FIG. 7 is an internal structural diagram of an electric brake disconnector and a starting disconnector according to a DD cross-sectional view of FIG. 6. The arrangement block diagram of the generator main circuit apparatus by Example 3 of this invention. The internal structure figure which accommodated the disconnector for starting with the generator breaker of FIG. The internal structure figure of the generator breaker which accommodated the disconnecting switch for starting which shows the modification of FIG.

Explanation of symbols

1, 1a, 1b, 1c ... Generator breaker, 2, 2a, 2b, 2c ... Phase reversal disconnector, 3, 3a, 3b, 3c ... Electrical brake disconnector, 3 ', 3a', 3b '... Electric Brake disconnect switch contacts, 4, 4a, 4b, 4c, 4d, 4e, 4f ... Start disconnector, 4 ', 4a', 4b ', 4c', 4d ', 4e', 4f '... For start Disconnector contact switch, 5, 5a, 5b, 5c ... Earth switch, 5a '... Ground switch contact switch, 6, 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h ... Stationary contact, 7, 7a, 7b, 7c, 7d, 7e, 7f, 7g, 7h ... current collector, 8, 8a, 8b, 8c, 8d, 8e, 8f, 8g ... support insulator, 9, 9a, 9b, 9c, 9d ... Fixed contact base, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 ... phase-separated buses, 21, 22, 23, 24, 25, 26, 27, 28 ... phase-separated bus conductors, 31, 32, 33, 34 ... Phase-separated bus enclosure, 51, 52 ... Generator breaker enclosure.

Claims (5)

In generator main circuit equipment with phase reversal disconnection switch that is used in pumped hydropower plants that switch generators to electric motors at the time of pumping and performs phase-sequence conversion switching between generator circuit breaker and generator main circuit,
A generator main circuit device characterized in that a contact opening / closing portion of a generator main circuit device is directly attached to a phase-separated bus conductor and accommodated in a bus enclosure.   The generator main circuit device according to claim 1, wherein the generator main circuit device includes an electric brake disconnector, a starter disconnector, and a grounding switch, and a contact switching unit thereof is directly attached to a phase separation bus conductor. Circuit equipment.   2. The generator main circuit device according to claim 1, wherein a part of the generator main circuit device is an electric brake disconnector and an activation disconnector, and the electric brake disconnector is connected to the phase separation bus at substantially the same position as the phase separation bus. The generator main circuit device, wherein the start-up disconnector is disposed on the lower side above the phase separation bus, or the upper lower side is reversed.   3. The generator main circuit device according to claim 1, wherein a part of the generator main circuit device is a grounding switch, and both ends of a phase separation bus connected between the main transformer side and the phase inversion disconnector are bent to have the same three-phase height. A generator main circuit device characterized in that a contact switching part of the ground switch is housed in an enclosure of the phase separation bus. In generator main circuit equipment with phase reversal disconnection switch that is used in pumped hydropower plants that switch generators to electric motors at the time of pumping and performs phase-sequence conversion switching between generator circuit breaker and generator main circuit,
A part of the generator main circuit device is an electric brake disconnector and a starter disconnector, and a contact opening / closing part of the electric brake disconnector is directly attached to a phase-separated bus conductor and stored in a bus enclosure. A generator main circuit device characterized in that a contact switching part of the start disconnector is directly attached to a phase separation bus conductor, and the phase separation bus conductor is housed in an enclosure of a generator breaker.

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