CN214476774U - Voltage transformer for direct current GIS - Google Patents
Voltage transformer for direct current GIS Download PDFInfo
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- CN214476774U CN214476774U CN202120842795.6U CN202120842795U CN214476774U CN 214476774 U CN214476774 U CN 214476774U CN 202120842795 U CN202120842795 U CN 202120842795U CN 214476774 U CN214476774 U CN 214476774U
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- 230000003287 optical effect Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 10
- 230000005540 biological transmission Effects 0.000 description 4
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- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000004069 differentiation Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
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Abstract
The utility model discloses a voltage transformer for direct current GIS, this voltage transformer includes: the shell comprises a first air chamber and a second air chamber which are adjacently arranged; the first air chamber is filled with positive-pressure insulating gas, and the second air chamber is filled with normal-pressure gas; the resistance-capacitance voltage divider comprises a high-voltage arm and a low-voltage arm which are connected with each other; the high pressure arm is disposed in the first air chamber and the low pressure arm is disposed in the second air chamber; the high-voltage arm comprises a plurality of stages of resistance-capacitance units which are connected in series. Because the capacitor in the resistance-capacitance voltage divider has the characteristic of quick shock response and the resistor has the characteristic of damped oscillation, the voltage transformer in the embodiment can measure high-frequency signals. And due to the steady-state voltage division characteristic of the resistor in the resistance-capacitance unit and the high time constant of the resistance-capacitance circuit in the resistance-capacitance unit, the low-frequency signal and the direct-current signal can be measured.
Description
Technical Field
The utility model relates to an electric power system technical field, concretely relates to a voltage transformer for direct current GIS.
Background
The gas-insulated metal-enclosed switchgear is a metal-enclosed switchgear and a control device, at least a part of which uses a gas above atmospheric pressure as an insulating medium. Gis (gas INSULATED switchgear) is a short term for gas INSULATED metal enclosed switchgear. At present, with the development of high-voltage direct-current power transmission and transformation technologies, a direct-current GIS becomes an optimal technical route in a transformer substation, a converter station and a conversion station among different transmission media due to the characteristics of small occupied space, high reliability and strong interchangeability.
Because the electromagnetic transformer is only suitable for measuring power frequency signals, the capacitor voltage transformer can measure voltage with higher frequency, but is not suitable for measuring direct current voltage due to smaller time constant.
Therefore, no effective and mature means exists at present when the voltage of the direct current GIS is measured.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in the unable problem that carries out voltage measurement to direct current GIS that exists among the prior art. Therefore, the voltage transformer for the direct current GIS is provided.
In order to achieve the above object, the embodiment of the utility model provides a voltage transformer for direct current GIS, this voltage transformer includes: the shell comprises a first air chamber and a second air chamber which are adjacently arranged; the first air chamber is filled with positive-pressure insulating gas, and the second air chamber is filled with normal-pressure gas; the resistance-capacitance voltage divider comprises a high-voltage arm and a low-voltage arm which are connected with each other; the high pressure arm is disposed in the first air chamber and the low pressure arm is disposed in the second air chamber; the high-voltage arm comprises a plurality of stages of resistance-capacitance units which are connected in series.
Optionally, both ends of the resistance-capacitance unit are respectively connected with a metal flange.
Optionally, a voltage grading and shielding structure is arranged on the metal flange.
Optionally, the grading shield structure is a grading ring.
Optionally, the grading ring increases in size gradually in a direction from the high pressure arm toward the low pressure arm.
Optionally, a first connecting piece is arranged at one end of the first air chamber far away from the second air chamber, and a second connecting piece is arranged at one end of the first air chamber close to the second air chamber; the first end of the high-voltage arm is connected with the first connecting piece, and the second end of the high-voltage arm is connected with the low-voltage arm through the second connecting piece.
Optionally, the first connector comprises: the first insulating piece is arranged at one end of the first air chamber far away from the second air chamber; the first insulator is adapted to seal a first end of the first plenum; the first contact base is arranged on the first insulating part; the first contact base is connected with the first end of the high-voltage arm; a conductive rod disposed in the primary system; the conductive rod is connected with the first contact base through the first insulating piece.
Optionally, the second connector comprises: the second insulating part is arranged at one end of the first air chamber close to the second air chamber; the second insulator is suitable for isolating the first air chamber and the second air chamber; the second contact base is arranged on the second insulating part; one end of the second contact base is connected with the second end of the high-voltage arm, and the other end of the second contact base is connected with the low-voltage arm.
Optionally, the voltage transformer further comprises: the signal processing device is arranged in the second air chamber; the signal processing device is connected with the low-voltage arm; the signal processing device is used for converting an input electric signal into an optical signal to be output, and the control system is simultaneously connected with the signal processing device and the secondary system.
Optionally, the low-voltage arm is provided with the resistance-capacitance unit.
Compared with the prior art, the utility model, have following advantage:
1. the embodiment of the utility model provides a voltage transformer for direct current GIS, this voltage transformer includes: the shell comprises a first air chamber and a second air chamber which are adjacently arranged; the first air chamber is filled with positive-pressure insulating gas, and the second air chamber is filled with normal-pressure gas; the resistance-capacitance voltage divider comprises a high-voltage arm and a low-voltage arm which are connected with each other; the high pressure arm is disposed in the first air chamber and the low pressure arm is disposed in the second air chamber; the high-voltage arm comprises a plurality of stages of resistance-capacitance units which are connected in series.
The embodiment of the utility model provides an in, because electric capacity in the resistance-capacitance voltage divider has quick impulse response characteristic, resistance has the damped oscillation characteristic for voltage transformer in this embodiment can measure high frequency signal. And due to the steady-state voltage division characteristic of the resistor in the resistance-capacitance unit and the high time constant of the resistance-capacitance circuit in the resistance-capacitance unit, the low-frequency signal and the direct-current signal can be measured.
2. The conventional transformer sleeve is made of insulating materials, and the stray capacitance to the ground is the direct capacitance between the component and the ground. Because the embodiment of the utility model provides an in the casing of voltage transformer be the metal material, and the casing is the ground potential, has reduced the distance between casing and the ground greatly in other words, has consequently increased stray capacitance to ground. And the current leakage caused by the stray capacitance and the reduction effect on the steep wave caused by the stray parameter jointly cause that the partial pressure of the resistance-capacitance unit is gradually reduced in the direction from the high-voltage arm to the low-voltage arm. The embodiment of the utility model provides a through the high pressure arm orientation in the direction of low pressure arm, will the size of grading ring increases gradually for the grading ring has the differentiation size, can compensate to the resistance-capacitance unit partial pressure is uneven, thereby realizes the equilibrium of voltage distribution and the optimization of electric field, improves insulating reliability. In addition, the influence of stray capacitance on measurement errors is inhibited by a method of compensating and adjusting the distance between the grading ring and the shell and the distance between the grading ring and the shell, and the measurement precision is further improved.
3. The utility model discloses a arrange low-pressure arm and signal processing device in the second air chamber, and the second air chamber is sufficient to have the ordinary pressure gas, so set up, is convenient for measure work such as wiring and maintenance.
4. The utility model discloses a set up signal processing device in the second air chamber, signal processing device with the low pressure arm is connected, so no longer use long cable to carry out remote signal transmission, no longer make the signal of telecommunication to the far-end secondary system carry out signal processing again to common TEV and EMI among the GIS threatens and measurement accuracy's influence to measuring equipment safety has effectively been avoided.
5. The utility model discloses a chooseing the device of the same technology and parameter with the high-pressure arm for use with the resistance-capacitance unit of low pressure arm, can guarantee the unanimous and the synchronization of temperature excursion of high-pressure arm and low pressure arm response characteristic, guaranteed measurement accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and obviously, the drawings in the following description are some embodiments of the present invention, and for a worker in the field, without creative efforts, other drawings can be obtained according to the drawings.
Fig. 1 is the utility model discloses voltage transformer's overall structure schematic diagram.
Reference numerals:
1. a housing; 2. a high pressure arm; 3. a low pressure arm; 4. a metal flange; 5. a voltage-sharing shielding structure; 6. a first contact base; 7. a first insulating member; 8. a second contact base; 9. a second insulating member; 10. a signal processing device; 11. a resistance-capacitance unit; 12. a first air chamber; 13. a second air chamber.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary workers in the field without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases for ordinary workers in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The gas-insulated metal-enclosed switchgear is a metal-enclosed switchgear and a control device, at least a part of which uses a gas above atmospheric pressure as an insulating medium. Gis (gas INSULATED switchgear) is a short term for gas INSULATED metal enclosed switchgear. At present, with the development of high-voltage direct-current power transmission and transformation technologies, a direct-current GIS becomes an optimal technical route in a transformer substation, a converter station and a conversion station among different transmission media due to the characteristics of small occupied space, high reliability and strong interchangeability. Because the electromagnetic transformer is only suitable for measuring power frequency signals, the capacitor voltage transformer can measure voltage with higher frequency, but is not suitable for measuring direct current voltage due to smaller time constant. Therefore, no effective and mature means exists at present when the voltage of the direct current GIS is measured.
Therefore, the to-be-solved technical problem of the utility model lies in the unable problem that carries out voltage measurement to direct current GIS that exists among the prior art. Therefore, the voltage transformer for the direct current GIS is provided.
Example 1
As shown in fig. 1, the embodiment of the utility model provides a voltage transformer for direct current GIS, this voltage transformer includes: the casing 1, the resistance-capacitance voltage divider and the resistance-capacitance unit 11.
The housing 1 comprises a first air chamber 12 and a second air chamber 13 which are adjacently arranged, wherein the first air chamber 12 is filled with positive pressure insulating gas, and the second air chamber 13 is filled with normal pressure gas. The resistance-capacitance voltage divider comprises a high-pressure arm 2 and a low-pressure arm 3 which are connected with each other, wherein the high-pressure arm 2 is transversely arranged in the first air chamber 12, and the low-pressure arm 3 is transversely arranged in the second air chamber 13. And a plurality of stages of resistance-capacitance units 11 which are mutually connected in series are arranged on the high-voltage arm 2. Specifically, as to the number of the resistance-capacitance units 11, a person skilled in the art may adjust the number according to actual situations, for example, the number may be 7 levels of resistance-capacitance units 11 connected in series, and this embodiment is merely an example, and is not limited to this embodiment, and the related technical effects may be achieved.
The embodiment of the utility model provides an in, because electric capacity in the resistance-capacitance voltage divider has quick impulse response characteristic, resistance has the damped oscillation characteristic for voltage transformer in this embodiment can measure high frequency signal. Moreover, due to the steady-state voltage division characteristic of the resistor in the resistance-capacitance unit 11 and the high time constant of the resistance-capacitance circuit in the resistance-capacitance unit 11, the low-frequency signal and the direct-current signal can be measured.
Since the conventional transformer bushing is an insulating material, the stray capacitance to ground is the capacitance between the component and ground. And the embodiment of the utility model provides an in casing 1 of voltage transformer be the metal material, and casing 1 is the ground potential, has reduced the distance between casing 1 and the ground greatly in other words, has consequently increased stray capacitance to ground. The current leakage caused by stray capacitance and the reduction effect on steep waves caused by stray parameters jointly cause that the partial voltage of the resistance-capacitance unit 11 is gradually reduced in the direction from the high-voltage arm 2 to the low-voltage arm 3.
In some embodiments of the present invention, both ends of the resistance-capacitance unit 11 are respectively connected with the metal flange 4. And a voltage-sharing shielding structure 5 is arranged on the metal flange 4. The grading and shielding structure 5 may be a grading ring. In the direction from the high-voltage arm 2 to the low-voltage arm 3, the size of the grading ring gradually increases.
According to the configuration, the embodiment of the utility model provides a through high-pressure arm 2 orientation on the direction of low-pressure arm 3, will the size of equalizer ring increases gradually for the equalizer ring has the differentiation size, can compensate to 11 partial pressure inequalities of resistance-capacitance unit, realizes voltage distribution's equilibrium and the optimization of electric field, improves insulating reliability. In addition, the influence of stray capacitance on measurement errors is inhibited by a method of compensating and adjusting the distance between the grading ring and the shell 1 and the distance between the grading ring and the shell, and the measurement precision is further improved.
Optionally, in some embodiments of the present invention, the first air chamber 12 is provided with a first connecting member at an end far away from the second air chamber 13, and the first air chamber 12 is provided with a second connecting member at an end near to the second air chamber 13. The first end of the high-voltage arm 2 is connected with the first connecting piece, and the second end of the high-voltage arm 2 is connected with the low-voltage arm 3 through the second connecting piece.
In particular, the first connection member comprises a first insulating member 7, a first contact socket 6 and a conductive rod. A first insulator 7 is arranged at an end of the first gas chamber 12 remote from the second gas chamber 13, the first insulator 7 being adapted to seal a first end of the first gas chamber 12. A first contact socket 6 is arranged on the first insulator 7, which first contact socket 6 is connected to a first end of the high voltage arm 2. A conducting rod is arranged in the primary system, said conducting rod being connected to said first contact socket 6 via said first insulating member 7.
In particular, the second connection comprises a second insulator 9 and a second contact seat 8. A second insulating member 9 is disposed at an end of the first air chamber 12 close to the second air chamber 13, the second insulating member 9 being adapted to isolate the first air chamber 12 from the second air chamber 13. The second contact base 8 is arranged on the second insulating member 9, one end of the second contact base 8 is connected with the second end of the high-voltage arm 2, and the other end is connected with the low-voltage arm 3.
The first insulator 7 and the second insulator 9 are used for supporting the high-voltage arm 2 and the low-voltage arm 3, and can also play roles of insulation and air chamber isolation. Of course, in this embodiment, a person skilled in the art may change the materials of the first insulating member 7 and the second insulating member 9 according to actual situations, and the material of this embodiment is not limited, and the same technical effects can be achieved.
Optionally, in some embodiments of the present invention, the voltage transformer further includes a signal processing device 10, the signal processing device 10 is disposed in the second air chamber 13, and the signal processing device 10 is connected to the low-voltage arm 3. The signal processing device 10 is used for converting an input electric signal into an optical signal and outputting the optical signal, and the control system is simultaneously connected with the signal processing device 10 and the secondary system.
According to the configuration, the utility model discloses a arrange low-pressure arm 3 and signal processing device 10 in second air chamber 13, and second air chamber 13 is full of and has the ordinary pressure gas, so set up, be convenient for measure work such as wiring and maintenance. And, the utility model discloses a set up signal processing device 10 in the second air chamber 13, signal processing device 10 with low-voltage arm 3 is connected, so no longer use long cable to carry out remote signal transmission, no longer make the signal of telecommunication to the distal end secondary system carry out signal processing again to common TEV and EMI among the GIS threatens and measurement accuracy's influence to measuring equipment safety has effectively been avoided.
Optionally, in some embodiments of the present invention, the resistance-capacitance unit 11 is disposed on the low-voltage arm 3. The utility model discloses a with the low pressure arm 3 hinder the device that holds unit 11 chooseed for use and the same technology of high pressure arm 2 and parameter, can guarantee high pressure arm 2 and the unanimity of low pressure arm 3 response characteristic and the synchronization of temperature excursion, guaranteed measurement accuracy.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Variations and modifications in other variations may occur to those skilled in the art based upon the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (10)
1. A voltage transformer for a direct current GIS, comprising:
the air conditioner comprises a shell (1) and a shell, wherein the shell comprises a first air chamber (12) and a second air chamber (13) which are adjacently arranged; the first air chamber (12) is filled with positive pressure insulating gas, and the second air chamber (13) is filled with normal pressure gas;
the resistance-capacitance voltage divider comprises a high-voltage arm (2) and a low-voltage arm (3) which are connected with each other; the high-pressure arm (2) is arranged in the first air chamber (12) and the low-pressure arm (3) is arranged in the second air chamber (13);
the high-voltage arm (2) comprises a plurality of stages of resistance-capacitance units (11) which are connected in series.
2. The voltage transformer according to claim 1, characterized in that both ends of the resistance-capacitance unit (11) are connected with metal flanges (4), respectively.
3. The voltage transformer according to claim 2, characterized in that a voltage grading shield (5) is provided on said metal flange (4).
4. A voltage transformer according to claim 3, characterized in that the grading shield structure (5) is a grading ring.
5. A voltage transformer according to claim 4, characterized in that the grading ring increases in size gradually in the direction of the high-voltage arm (2) towards the low-voltage arm (3).
6. The voltage transformer according to any of the claims 1-5, characterized in that the first air chamber (12) is provided with a first connection at an end remote from the second air chamber (13), and that the first air chamber (12) is provided with a second connection at an end close to the second air chamber (13); the first end of the high-voltage arm (2) is connected with the first connecting piece, and the second end of the high-voltage arm (2) is connected with the low-voltage arm (3) through the second connecting piece.
7. The voltage transformer of claim 6, wherein the first connector comprises:
a first insulating piece (7) arranged at one end of the first air chamber (12) far away from the second air chamber (13); the first insulator (7) is adapted to seal a first end of the first gas chamber (12);
a first contact seat (6) arranged on the first insulator (7); the first contact base (6) is connected with the first end of the high-voltage arm (2);
a conductive rod disposed in the primary system; the conducting rod is connected with the first contact seat (6) through the first insulating piece (7).
8. The voltage transformer of claim 6, wherein the second connector comprises:
a second insulating member (9) disposed at an end of the first air chamber (12) adjacent to the second air chamber (13); the second insulator (9) is adapted to isolate the first and second gas chambers (12, 13);
a second contact seat (8) arranged on the second insulating member (9); one end of the second contact seat (8) is connected with the second end of the high-voltage arm (2), and the other end of the second contact seat is connected with the low-voltage arm (3).
9. The voltage transformer according to any one of claims 1 to 5, further comprising:
a signal processing device (10) arranged in the second gas chamber (13); the signal processing device (10) is connected with the low-voltage arm (3); the signal processing device (10) is used for converting input electric signals into optical signals to be output, and the control system is simultaneously connected with the signal processing device (10) and the secondary system.
10. Voltage transformer according to any of claims 1-5, characterized in that the low voltage arm (3) is provided with the RC unit (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120842795.6U CN214476774U (en) | 2021-04-22 | 2021-04-22 | Voltage transformer for direct current GIS |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120842795.6U CN214476774U (en) | 2021-04-22 | 2021-04-22 | Voltage transformer for direct current GIS |
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| CN202120842795.6U Active CN214476774U (en) | 2021-04-22 | 2021-04-22 | Voltage transformer for direct current GIS |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656606A (en) * | 2022-10-27 | 2023-01-31 | 常州博瑞电力自动化设备有限公司 | Voltage transformer |
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- 2021-04-22 CN CN202120842795.6U patent/CN214476774U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115656606A (en) * | 2022-10-27 | 2023-01-31 | 常州博瑞电力自动化设备有限公司 | Voltage transformer |
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