CN111781419A - Integrated voltage detection and signal acquisition system for medium and high voltage generator - Google Patents
Integrated voltage detection and signal acquisition system for medium and high voltage generator Download PDFInfo
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Abstract
The invention discloses an integrated voltage detection and signal acquisition system for a medium and high voltage generator, which comprises a digital voltage regulator, a three-phase high voltage transformer and three single-phase low voltage transformers. The digital voltage regulator comprises a digital-to-analog conversion circuit, a power module circuit, a microprocessor circuit, an excitation output circuit and a man-machine interaction module. The excitation output circuit is connected with an exciter of the generator; the head ends of three high-voltage windings of the three-phase high-voltage transformer are connected with the outlet end of the three-phase winding of the generator in a one-to-one correspondence manner, and the head ends of three low-voltage windings are respectively connected with a digital-to-analog conversion circuit in the digital voltage regulator; the head ends of the primary windings of the three single-phase low-voltage transformers are respectively connected with the head ends of the three low-voltage windings; the head ends of the three secondary windings are used for detecting the line voltage of 100V. The invention can meet the 230V and 100V output signals required by the measurement and protection system of the generator with the rated voltage of 6.3 KV-13.8 KV.
Description
Technical Field
The invention relates to an integrated voltage detection and signal acquisition system for a medium-high voltage generator.
Background
The existing voltage detection and protection system of the medium-high voltage generator generally adopts a PT group consisting of a plurality of single-phase voltage transformers with single windings, and realizes the voltage detection of the generator and the acquisition of protection signals by connecting a busbar of the generator with the high-voltage side of the transformers and connecting a voltage regulator of the generator with the low-voltage side of the transformers. In the existing voltage detection scheme of the medium-high voltage diesel generator set, 2-3 single-phase voltage transformers (single-phase PT) with the same specification and fixed transformation ratio form a V-V connection method or a Y-Y connection method and are connected with a voltage regulator of a generator. The V-V connection detection system consisting of 2 single-phase PTs can only detect line voltage, and voltage signals only meet the measurement and protection of a generator line per se and cannot detect phase voltage of the system, so that the grounding protection of the system cannot be realized; the Y-Y connection detection system composed of 3 single-phase PTs can detect line voltage and phase voltage and realize various detections and protections, but the detection system composed of 3 single-phase PTs occupies a large space and is limited by the requirements of limited space and electrical clearance inside a generator, a large junction box must be designed or a special electrical cabinet is configured independently, so that the cost is greatly increased, and in addition, each single-phase PT is usually a winding with a fixed transformation ratio and cannot simultaneously meet the output of secondary side voltage 230V and 100V. In addition, the voltage transformer in the detection system has a fixed transformation ratio, and the secondary side voltage cannot be finely adjusted when errors occur due to magnetic circuit saturation or other factors, so that the existing voltage detection method for the generator set has high difference and is not suitable for standardized configuration.
In conclusion, due to the characteristics of small specific size, compact space, flexible electric system and the like of the medium-high voltage diesel generator set, the voltage detection and signal acquisition system in the prior art is difficult to meet the requirements.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an integrated voltage detection and signal acquisition system for a medium and high voltage generator, which can meet 230V and 100V output signals required by a measurement and protection system of a generator with the rated voltage of 6.3 KV-13.8 KV, and is designed into a modularized installation interface so as to meet the miniaturization and integration requirements of the voltage detection and signal acquisition functions of the medium and small-sized medium and high voltage generator.
The purpose of the invention is realized as follows: an integrated voltage detection and signal acquisition system for a medium and high voltage generator comprises a digital voltage regulator, three-phase high-voltage transformers and three single-phase low-voltage transformers; wherein,
the digital voltage regulator comprises a digital-to-analog conversion circuit, a power module circuit, a microprocessor circuit, an excitation output circuit, a relay device, a human-computer interaction module, a USB2.0 interface and an LED display screen; the power supply output end of the digital-to-analog conversion circuit is connected with the power supply input end of the power module circuit, and the voltage sampling signal output end of the digital-to-analog conversion circuit is connected with the sampling signal input end of the microprocessor circuit; the power supply output end of the power module circuit is respectively connected with the power supply input end of the microprocessor circuit, the power supply input end of the excitation output circuit and the power supply input end of the human-computer interaction module; the microprocessor circuit is respectively connected with the excitation output circuit and the man-machine interaction module in a bidirectional way, and the signal output end of the microprocessor circuit is connected with the signal input end of the relay device; the output end of the excitation output circuit is connected with the input end of an exciter of the generator; the signal output end of the human-computer interaction module is connected with the signal input end of the LED display screen; the human-computer interaction module is connected with the USB2.0 interface and is directly connected with a computer through the USB2.0 interface;
the three-phase high-voltage transformer consists of three same high-voltage windings and three same low-voltage windings, and the transformation ratio of the high-voltage windings to the low-voltage windings is 60: 1; the rated voltage of each high-voltage winding is 13.8KV, and the rated voltage of each low-voltage winding is 230V; the head ends of the three high-voltage windings are connected with the outlet ends of the three-phase windings of the generator in a one-to-one correspondence manner, and the tail ends of the three high-voltage windings are grounded; the head ends of the three low-voltage windings are connected with three input ends of a digital-to-analog conversion circuit in the digital voltage regulator in a one-to-one correspondence mode, and the tail ends of the three low-voltage windings are grounded;
the three single-phase low-voltage transformers respectively comprise a primary winding and a secondary winding with the transformation ratio of 230: 100; the head ends of the three primary windings are connected with the head ends of the three low-voltage windings of the three-phase high-voltage transformer in a one-to-one correspondence manner; the tail ends of the three primary windings and the tail ends of the three secondary windings are grounded in a point-sharing manner;
when the voltage required to be detected by an external measurement and protection system is 230V, connecting the head ends of three low-voltage windings of a three-phase high-voltage transformer;
when the detection voltage required by the external measurement and protection system is 100V, the head ends of three secondary windings of the three single-phase low-voltage transformers are connected.
The integrated voltage detection and signal acquisition system for the medium and high voltage generator is characterized in that the three-phase high voltage transformer, the three single-phase low voltage transformers and the digital voltage regulator are all arranged in a totally-enclosed protective box body, the protective box body comprises a bottom plate and a protective shell fixed on the bottom plate through a nut and a bolt, three cable inlet and outlet holes are respectively formed in the front end plate and the rear end plate of the protective shell, and a sealing stuffing box is arranged in each cable inlet and outlet hole;
the three-phase high-voltage transformer module is arranged on a rectangular steel bottom plate, one side edge of the steel bottom plate is provided with a grounding terminal, and four corners of the steel bottom plate are respectively provided with a bolt hole; the three-phase high-voltage transformer module is arranged in the middle of the bottom plate of the protective box body through a steel bottom plate and four bolts;
three single-phase low-voltage transformers are arranged at the rear part of the bottom plate of the protective box body;
the digital voltage regulator is installed through a voltage regulator protective housing the inboard of a curb plate of protective housing, the panel of this voltage regulator protective housing inlays on the mounting hole of seting up on this curb plate, the mid-mounting of this voltage regulator protective housing's panel the USB2.0 interface.
The integrated voltage detection and signal acquisition system for the medium and high voltage generator is characterized in that a plurality of vibration reduction pads are respectively and alternately arranged on the bottom surface of the front edge and the bottom surface of the rear edge of the bottom plate of the protection box body.
In the integrated voltage detection and signal acquisition system for the medium-high voltage generator, the top plate and the bottom plate of the voltage regulator protective shell are respectively provided with an inlet wire hole and an outlet wire hole.
The integrated voltage detection and signal acquisition system for the medium and high voltage generator has the following characteristics:
1) the voltage regulator based on integrated circuit control is used for detecting the secondary side voltage value of the high-voltage transformer, the set voltage is compared and adjusted, the excitation output is adjusted circularly according to the difference value of the detected voltage and the set voltage, and finally the error of a measuring system is eliminated, so that the precision of the ratio of the rated output voltage of the generator to the output voltage of the detection signal is controlled to be higher than 0.25%;
2) a specially-made high-voltage transformer is adopted, and three 60:1 high-voltage and low-voltage windings are arranged in the specially-made high-voltage transformer to form a three-phase integrated voltage transformer, so that the voltage reduction detection of 6.3-13.8 KV high-voltage can be realized;
3) three single-phase voltage transformers with small capacity are combined into a low-voltage transformer group, and the detection of 100V or 230V low voltage can be realized through two wiring modes;
4) two groups of integrated voltage transformers and digital voltage regulators which are designed in a standardized manner are integrated in a closed type protection box body with the protection grade reaching IP54, a wiring terminal of a high-voltage transformer is provided with a gap of 190mm and meets the electrical safety gap below 13.8kV, and an inlet and an outlet of a cable are sealed by adopting stuffing boxes so as to realize the miniaturization and integration requirements of voltage detection and signal acquisition functions of medium and small-sized and high-voltage generators, and the integrated type high-voltage transformer can be quickly and safely installed on the side of an outlet box of a generator set and also can be independently installed in a high-voltage; the protection box body effectively meets the requirements of dust prevention, moisture prevention and salt mist prevention, is applied to places with severe environments, such as sea, dust, air pollution and the like, can flexibly configure a detection and protection scheme according to the rated voltage of a generator and the detection voltage of a voltage regulator, has strong universality, is suitable for batch production and popularization, simplifies the installation requirements of a system due to standardized and modularized design, reduces the comprehensive cost of the system, and is convenient to popularize.
Drawings
FIG. 1 is a schematic diagram of an integrated voltage detection and signal acquisition system for a medium and high voltage generator according to the present invention;
FIG. 2 is a schematic block diagram of a digital voltage regulator in the integrated voltage detection and signal acquisition system for the medium and high voltage generator according to the present invention;
FIG. 3 is a front view of a protection box in the integrated voltage detection and signal acquisition system for the medium and high voltage generator of the present invention;
FIG. 4 is a right side view of FIG. 3;
FIG. 5 is a view from A-A in FIG. 4 (rotated 90);
fig. 6 is an isometric view of a voltage regulator protective housing in the integrated voltage detection and signal acquisition system for a medium and high voltage generator of the present invention;
fig. 7 is an internal structure view of a voltage regulator protective casing in the integrated voltage detection and signal acquisition system for the medium and high voltage generator according to the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 7, the integrated voltage detection and signal acquisition system for a medium and high voltage generator of the present invention includes a digital voltage regulator 1, a three-phase high voltage transformer 2, and three single-phase low voltage transformers 3.
The digital voltage regulator 1 comprises a digital-to-analog conversion circuit 11, a power module circuit 12, a microprocessor circuit 13, an excitation output circuit 14, a relay device 15, a man-machine interaction module 16, a USB2.0 interface 17 and an LED display screen 18; wherein, the power output end of the digital-to-analog conversion circuit 11 is connected with the power input end of the power module circuit 12, and the voltage sampling signal output end of the digital-to-analog conversion circuit 11 is connected with the sampling signal input end of the microprocessor circuit 13; the power supply output end of the power module circuit 12 is respectively connected with the power supply input end of the microprocessor circuit 13, the power supply input end of the excitation output circuit 14 and the power supply input end of the human-computer interaction module 16; the microprocessor circuit 13 is respectively connected with the excitation output circuit 14 and the man-machine interaction module 16 in a bidirectional way, and the signal output end of the microprocessor circuit 13 is connected with the signal input end of the relay device 15; the output end F +, F-of the excitation output circuit 14 is connected with the input end of the exciter of the generator; the signal output end of the man-machine interaction module 16 is connected with the signal input end of the LED display screen 18; the human-computer interaction module 16 is connected with the USB2.0 interface 17 and is directly connected with a computer through the USB2.0 interface;
the three-phase high-voltage potential transformer 2 consists of three same high-voltage windings and three same low-voltage windings, and the transformation ratio of the high-voltage windings to the low-voltage windings is 60: 1; the rated voltage of each high-voltage winding is 13.8KV, and the rated voltage of each low-voltage winding is 230V; the head ends T1, T2 and T3 of the three high-voltage windings are connected with the outlet end A, B, C of the three-phase winding of the generator in a one-to-one correspondence mode, and the tail ends T4, T5 and T6 of the three high-voltage windings are used for neutral point grounding of high-voltage electricity in a star connection mode; the head ends X1, X2 and X3 of the three low-voltage windings are voltage signal output ends after voltage reduction and are connected with three input ends of a digital-to-analog conversion circuit in the digital voltage regulator 1 in a one-to-one correspondence manner; the tail ends X4, X5 and X6 of the three low-voltage windings are used for grounding a neutral point of a low-voltage star connection;
the three single-phase low-voltage transformers 3 respectively comprise a primary winding and a secondary winding with the transformation ratio of 230: 100; the head ends A1, A2 and A3 of the three primary windings are connected with the head ends X1, X2 and X3 of the three low-voltage windings of the three-phase high-voltage transformer 2 in a one-to-one correspondence manner; the tail ends B1, B2 and B3 of the three primary windings and the tail ends B1, B2 and B3 of the three secondary windings are grounded in a point-sharing mode, the three primary windings and the three secondary windings form a star connection method, the rated voltages of the three primary windings are also 230V, and the rated voltages of the three secondary windings are 100V.
When the voltage required to be detected by an external measurement and protection system is 230V, the head ends of three low-voltage windings of the three-phase high-voltage transformer 2 are connected;
when the detection voltage required by the external measurement and protection system is 100V, the head ends of three secondary windings of the three single-phase low-voltage transformers 3 are connected.
The working principle of the integrated voltage detection and signal acquisition system for the medium and high voltage generator is as follows:
the input signal of the digital voltage regulator 1 is provided by a low-voltage winding of a three-phase high-voltage transformer 2, and is an input source of the voltage signal of the digital voltage regulator 1 and a power input source of the digital voltage regulator 1; the digital-to-analog conversion circuit 11 in the digital voltage regulator 1 receives the voltage signals of AC200 to AC260V output by the three low-voltage windings, and after the voltage signals are rectified, filtered and stabilized, the voltage signals are respectively provided for the power module circuit 12 and the microprocessor circuit 13 according to direct currents with different voltages; replaceable 5A fuses and components capable of bearing the voltage limit of AC600V at most are arranged between the input end of the digital-to-analog conversion circuit 11 and the head ends X1, X2 and X3 of the three low-voltage windings so as to provide overcurrent or overvoltage protection for the digital voltage regulator 1. The power module circuit 12 receives the direct-current voltage from the digital-to-analog conversion circuit 11, and supplies power to the microprocessor circuit 13, the excitation output circuit 14 and the human-computer interaction module 16 after secondary voltage stabilization and filtering; after the microprocessor circuit 13 receives the digital voltage signal provided by the digital-to-analog conversion circuit 11 and the voltage setting signal value provided by the human-computer interaction module 16, the difference between the two voltage signals is compared, the difference signal is amplified, the excitation control signal is controllably adjusted in a control mode of proportional-integral-derivative (PID-derivative), and the excitation control signal is used for triggering and controlling a power component in the excitation output circuit 14, so as to adjust the level of the direct-current excitation voltage output value of the excitation output circuit 14, and further adjust the output of the exciter, so that the voltage value of the terminal voltage of the generator after being reduced by the high-voltage transformer 2 is completely consistent with the voltage setting value of the voltage regulator 1. The man-machine interaction module 16 is directly connected with a computer through a USB2.0 interface 17, and a target voltage value, a protection value of system overvoltage and a protection value of system undervoltage and a protection delay time of the voltage detection and signal acquisition system can be set through the computer. When the voltage signal is outside the range of the set value, the microprocessor circuit 13 will send a protection signal to the relay device 15. The human-computer interaction module 18 is further connected with an LED display screen 18 for displaying the operation state of the system during operation.
The digital voltage regulator 1 sends a control signal by comparing the difference value of the measured voltage and the set voltage, proportionally controls the output of the voltage regulator to adjust the output of the exciter of the generator, can realize accurate voltage setting by repeated cyclic measurement and control, effectively offsets the measurement error of components or systems such as a voltage transformer, an excitation system and the like caused by the manufacturing process or the difference of raw materials, and has the integral voltage regulating precision of 0.25 percent.
The three-phase high-voltage potential transformer 2, the three single-phase low-voltage potential transformers 3 and the digital voltage regulator 1 are all arranged in a totally-enclosed protective box body, the protective box body comprises a bottom plate 8 and a protective shell 4 fixed on the bottom plate 8 through a nut and a bolt, and a joint surface of the protective shell 4 and the bottom plate 8 is provided with a sealing rubber strip; the front end plate and the rear end plate of the protective shell 4 are respectively provided with three cable inlet and outlet holes, and each cable inlet and outlet hole is provided with a sealing stuffing box 5; the high-low voltage detection cable and the control signal cable of the digital voltage regulator 1 enter the protective shell 4 through the sealing stuffing box 5, so that the protection grade of the whole structure of the protective box body can reach IP54, and salt spray, water spraying and dust erosion to high-low voltage electrical elements can be effectively prevented. Four rubber shock pads 7 are respectively installed at intervals at the bottom of the front edge, the bottom of the rear edge and the bottom of the rear edge of the bottom plate 8, so that the vibration source of the generator set can be effectively isolated or reduced.
The three-phase high-voltage potential transformer 2 is integrated into a module after being poured and sealed by epoxy resin, and leads out head ends T1, T2, T3 and tail ends T4, T5 and T6 of three high-voltage windings and head ends X1, X2, X3 and tail ends X4, X5 and X6 of three low-voltage windings; the head ends T1, T2, T3 and the tail ends T4, T5 and T6 of the three high-voltage windings and the head ends X1, X2, X3 and the tail ends X4, X5 and X6 of the three low-voltage windings are respectively provided with copper bolts and binding posts; the three-phase high-voltage transformer module is arranged on a rectangular steel bottom plate 20, one side edge of the steel bottom plate 20 is provided with a grounding terminal 21, and four corners of the steel bottom plate 20 are respectively provided with a bolt hole 22; the three-phase high-voltage transformer module is arranged in the middle of the bottom plate 8 of the protective box body through a steel bottom plate 20 and four bolts;
the three-phase high-voltage potential transformer 2 is characterized in that the wiring posts of the head ends T1, T2 and T3 of three high-voltage windings on the high-voltage side are used for high-voltage detection input, and the wiring posts of the tail ends T4, T5 and T6 of the three high-voltage windings are connected with the grounding terminal 21 through cables and are used for grounding the neutral point of the high-voltage star connection; leading-out head ends X1, X2 and X3 wiring columns of three low-voltage windings on the low-voltage side of the three-phase high-voltage transformer 2 and tail ends X4, X5 and X6 wiring columns of the three low-voltage windings, wherein the head ends X1, X2 and X3 of the three low-voltage windings are respectively connected to input ends E1, E2 and E3 of the digital voltage regulator 1 through cables, the tail ends X4, X5 and X6 wiring columns of the three low-voltage windings are connected with a grounding terminal 21 through cables, and a neutral point of a low-voltage star connection method is grounded;
the three single-phase low-voltage transformers 3 are arranged at the rear part of a bottom plate 8 of the protective box body; three single-phase low-voltage transformers 3 lead out head ends A1, A2, A3 and tail ends B1, B2 and B3 of three primary windings and head ends a1, a2, A3 and tail ends B1, B2 and B3 of three secondary windings; the head ends A1, A2 and A3 of the three primary windings are connected to the wiring posts of leading-out head ends X1, X2 and X3 of the three low-voltage windings in a one-to-one correspondence manner through cables; the tail ends B1, B2 and B3 of the three primary windings and the tail ends B1, B2 and B3 of the three secondary windings are connected with the ground terminal 21 through cables to respectively form star connection of the primary windings and the secondary windings;
when the rated voltage of the generator is 10 KV-13.8 KV, the three high-voltage windings of the three-phase high-voltage transformer 2 are connected in a star shape, the three low-voltage windings are also connected in a star shape, and the output voltages between the head ends X1, X2 and X3 and the tail ends X4, X5 and X6 of the three low-voltage windings are 230V.
The three single-phase low-voltage transformers 3 lead the head ends a1, a2 and a3 of three secondary windings respectively to be used for detecting the line voltage of 100V.
The digital voltage regulator 1 is arranged on the inner side of one side plate of the protective shell 4 through a voltage regulator protective shell 6, and the digital voltage regulator 1 is provided with a connecting terminal 9(E1, E2 and E3) for voltage detection and power supply input and two connecting terminals 10(F + and F-) for excitation control signal output; the E1 terminal, the E2 terminal and the E3 terminal are respectively connected with the first-end X1, X2 and X3 binding posts of three low-voltage windings of the three-phase high-voltage potential transformer 2 in a one-to-one correspondence mode through cables; the F + terminal and the F-terminal are connected with an exciter of the generator; the panel 60 of the voltage regulator protective shell 6 is embedded in a mounting hole formed on a side plate of the protective shell 4, and a top plate and a bottom plate of the voltage regulator protective shell 6 are respectively provided with an inlet wire hole and an outlet wire hole; the middle part of the panel 60 of the voltage regulator protective shell 6 is provided with a USB2.0 interface 17, so that the digital voltage regulator 1 is directly connected with a computer through the USB2.0 interface 17, the rated voltage is preset through the computer, the output of an excitation control signal (F +, F-) can be adjusted by comparing the detected difference between the actual voltage and the set voltage during power-on work, and the output voltage of the generator is adjusted to be the standard rated voltage.
The integrated voltage detection and signal acquisition system for the medium and high voltage generator adopts a standard installation size and an electrical interface in a modularized design, can be flexibly configured on the generator or a related high voltage system to adapt to the special requirements of voltage detection and signal acquisition for the diesel generator set, meets the requirement of uniformly outputting standard 230V and 100V secondary side voltages under different rated voltage states of the generator or the related high voltage system, and is used for detecting and protecting the generator system. The invention solves the problems that the phase voltage cannot be detected when a single-phase transformer system is connected in a V-V mode, the size is too large and the cost is too high when a Y-Y mode is connected, the voltage transformation ratio of the single-phase transformer is fixed and cannot be adjusted, the uniform secondary side voltage output cannot be realized by different rated voltages, and the like.
According to the integrated voltage detection and signal acquisition system for the medium and high voltage generator, the digital voltage regulator is used for detecting and comparing the primary and secondary voltage signals of the two sets of voltage transformers, the actual secondary voltage signal can be set in the voltage regulator and fed back to the excitation system of the generator, so that the accurate voltage signal control is realized, and the precision of the rated output voltage of the generator is higher than 0.25%. The system can be universally used for all generator junction boxes, unit control cabinets and load terminal control cabinets related to medium and high voltage generator systems with rated voltage of 6.3 KV-13.8 KV.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (4)
1. An integrated voltage detection and signal acquisition system for a medium and high voltage generator comprises a digital voltage regulator, three-phase high-voltage transformers and three single-phase low-voltage transformers; it is characterized in that the preparation method is characterized in that,
the digital voltage regulator comprises a digital-to-analog conversion circuit, a power module circuit, a microprocessor circuit, an excitation output circuit, a relay device, a human-computer interaction module, a USB2.0 interface and an LED display screen; the power supply output end of the digital-to-analog conversion circuit is connected with the power supply input end of the power module circuit, and the voltage sampling signal output end of the digital-to-analog conversion circuit is connected with the sampling signal input end of the microprocessor circuit; the power supply output end of the power module circuit is respectively connected with the power supply input end of the microprocessor circuit, the power supply input end of the excitation output circuit and the power supply input end of the human-computer interaction module; the microprocessor circuit is respectively connected with the excitation output circuit and the man-machine interaction module in a bidirectional way, and the signal output end of the microprocessor circuit is connected with the signal input end of the relay device; the output end of the excitation output circuit is connected with the input end of an exciter of the generator; the signal output end of the human-computer interaction module is connected with the signal input end of the LED display screen; the human-computer interaction module is connected with the USB2.0 interface and is directly connected with a computer through the USB2.0 interface;
the three-phase high-voltage transformer consists of three same high-voltage windings and three same low-voltage windings, and the transformation ratio of the high-voltage windings to the low-voltage windings is 60: 1; the rated voltage of each high-voltage winding is 13.8KV, and the rated voltage of each low-voltage winding is 230V; the head ends of the three high-voltage windings are connected with the outlet ends of the three-phase windings of the generator in a one-to-one correspondence manner, and the tail ends of the three high-voltage windings are grounded; the head ends of the three low-voltage windings are connected with three input ends of a digital-to-analog conversion circuit in the digital voltage regulator in a one-to-one correspondence mode, and the tail ends of the three low-voltage windings are grounded;
the three single-phase low-voltage transformers respectively comprise a primary winding and a secondary winding with the transformation ratio of 230: 100; the head ends of the three primary windings are connected with the head ends of the three low-voltage windings of the three-phase high-voltage transformer in a one-to-one correspondence manner; the tail ends of the three primary windings and the tail ends of the three secondary windings are grounded in a point-sharing manner;
when the voltage required to be detected by an external measurement and protection system is 230V, connecting the head ends of three low-voltage windings of a three-phase high-voltage transformer;
when the detection voltage required by the external measurement and protection system is 100V, the head ends of three secondary windings of the three single-phase low-voltage transformers are connected.
2. The integrated voltage detection and signal acquisition system for the medium and high voltage generator as claimed in claim 1, wherein the three-phase high voltage transformer, the three single-phase low voltage transformers and the digital voltage regulator are all installed in a totally enclosed protective box body, the protective box body comprises a bottom plate and a protective shell fixed on the bottom plate through a nut and a bolt, three cable access holes are respectively formed in front and rear end plates of the protective shell, and a sealing stuffing box is installed in each cable access hole;
the three-phase high-voltage transformer module is arranged on a rectangular steel bottom plate, one side edge of the steel bottom plate is provided with a grounding terminal, and four corners of the steel bottom plate are respectively provided with a bolt hole; the three-phase high-voltage transformer module is arranged in the middle of the bottom plate of the protective box body through a steel bottom plate and four bolts;
three single-phase low-voltage transformers are arranged at the rear part of the bottom plate of the protective box body;
the digital voltage regulator is installed through a voltage regulator protective housing the inboard of a curb plate of protective housing, the panel of this voltage regulator protective housing inlays on the mounting hole of seting up on this curb plate, the mid-mounting of this voltage regulator protective housing's panel the USB2.0 interface.
3. The integrated voltage detecting and signal collecting system for the medium and high voltage generator as claimed in claim 2, wherein a plurality of vibration damping pads are installed at intervals on the bottom surface of the front edge and the bottom surface of the rear edge of the bottom plate of the protective case respectively.
4. The integrated voltage detection and signal acquisition system for the medium and high voltage generator as claimed in claim 2, wherein the top plate and the bottom plate of the voltage regulator protective casing are respectively provided with an inlet and outlet hole.
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