CN109917231B - System and method for acquiring metering performance of electric energy metering device under single-phase earth fault - Google Patents
System and method for acquiring metering performance of electric energy metering device under single-phase earth fault Download PDFInfo
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Abstract
The invention discloses a system and a method for acquiring the metering performance of an electric energy metering device under a single-phase earth fault, which comprises the following steps: selecting a phase C as a fault phase on a three-phase circuit of the high-voltage system, selecting a phase A as a non-fault detection phase, and setting a grounding capacitor on each phase of the three-phase circuit; a power supply side voltage transformer is arranged on the power supply side of the three-phase line, and a load side voltage transformer is arranged on the load side of the three-phase line; the switch K and the resistor R which are sequentially connected in series are arranged, one end, far away from the resistor R, of the switch K is connected with the C phase, and one end, far away from the switch K, of the resistor R is grounded. The method for acquiring the metering performance of the electric energy metering device under the single-phase earth fault is provided with the steps, so that the metering performance of the electric energy metering device is evaluated when the single-phase earth fault is detected, and the detection device works under the working condition of large current and high voltage under the condition of low load through the design of the detection device, so that the blank of the prior art is made up.
Description
Technical Field
The invention relates to the technical field of power supply testing, in particular to a method for obtaining the measuring performance of an electric energy measuring device operating under high voltage and high current under the condition of one-time low load when the single-phase earth fault occurs.
Background
The medium-voltage distribution network system in China is mostly a neutral point insulation system, and the single-phase earth fault is one of the fault types which often occur in the distribution network system. According to the regulations of relevant regulations in the power industry, when a single-phase earth fault occurs, the power distribution network system adopting a neutral point insulation mode can still operate for 2 hours in a live mode, and in the 2 hours, when the electric energy metering device is arranged at different positions, how the electric energy metering relation of a user is not clear, and a test system needs to be built for research. For high-supply-height metering users, the electric energy metering device may be installed at the front end of the step-down transformer and close to the step-down transformer, or may be installed at the outlet side of the power supply (or the substation), and the single-phase ground fault generally occurs on the line, i.e. at the middle position between the outlet side of the power supply (or the substation) and the front end of the step-down transformer, so that when the single-phase ground fault occurs, the metering performance of the electric energy metering device may change, and the electric energy metering of different installation positions of the electric energy metering device may be different. In the prior art, an evaluation means for the metering performance of an electric energy metering device during single-phase earth fault is lacked.
Disclosure of Invention
The technical problem to be solved by the invention is that in the prior art, an evaluation means for the metering performance of the electric energy metering device during single-phase earth fault is lacked, and the invention aims to provide a system and a method for acquiring the metering performance of the electric energy metering device under the single-phase earth fault, so as to solve the problem.
The invention is realized by the following technical scheme:
the system for acquiring the metering performance of the electric energy metering device under the single-phase ground fault selects a phase C as a fault phase on a three-phase circuit of a high-voltage system, selects a phase A as a non-fault detection phase, and sets a ground capacitor on each phase of the three-phase circuit;
a power supply side voltage transformer is arranged on the power supply side of the three-phase line, and a load side voltage transformer is arranged on the load side of the three-phase line;
a non-fault phase detection device is arranged on the phase A and is positioned between a power supply side voltage transformer and a load side voltage transformer; the non-fault phase detection device passes through the grounding capacitor C of the phase AAGrounded and grounded capacitance CAIs connected to the non-fault phase detection device and provides a grounding capacitor C for the non-fault phase detection deviceACurrent I at high voltage endCA(ii) a The A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device;
a fault phase detection device is arranged on the phase C and is positioned between a power supply side voltage transformer and a load side voltage transformer; the fault phase detection device is also sequentially connected with a switch K and a resistor R which are connected in series, one end of the resistor R far away from the switch K is grounded, and the fault phase detection device receives a fault grounding current Ig(ii) a And the C-phase circuit is connected with the fault phase detection device and provides C-phase voltage for the fault phase detection device.
When the invention is applied, one phase C is selected as a fault phase and is used as a fault detection phase on a three-phase circuit of a high-voltage system, one phase A or/and one phase B are selected as non-fault detection phases, each phase on the three-phase circuit is provided with a grounding capacitor, and the grounding capacitor is used for simulating the grounding capacitor of the circuit. A power supply side voltage transformer is arranged on the power supply side of the three-phase line, a load side voltage transformer is arranged on the load side of the three-phase line, in order to compare and test the electrical performance of the electrical energy metering devices on different power supply sides and different load sides, the electrical energy metering devices are required to be arranged on the two parts, for the three-phase four-wire type electric energy metering device, the detection devices are required to be simultaneously arranged on the A phase, the B phase and the C phase to provide current for the three-phase four-wire type electric energy metering device, for the three-phase three-line type electric energy metering device, only one phase is selected between the A phase and the B phase to carry out non-fault phase detection, and fault phase detection is carried out on the C phase to provide current for a three-phase three-wire type electric energy metering device, wherein a load side voltage transformer is a part of the load side electric energy metering device, and a power supply side voltage transformer is a part of the power supply side electric energy metering device.
Arranging a non-fault phase detection device on the A phase or/and the B phase, wherein the non-fault phase detection device is positioned between a power supply side voltage transformer and a load side voltage transformer; the non-fault phase detection device passes through the grounding capacitor C of the phase AAGrounded and grounded capacitance CAIs connected to the non-fault phase detection device and provides a grounding capacitor C for the non-fault phase detection deviceACurrent I at high voltage endCA(ii) a The A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device; in order to detect the electric energy metering device, the current in the line needs to be detected, and the detection device also needs to be maintained in a large-current high-voltage environment, so that the grounding capacitor C is provided for the non-fault phase detection device at the momentACurrent I at high voltage endCAAnd a current booster in the non-fault phase detection device provides a large current, and the A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device to ensure that the non-fault phase detection device operates in a high-voltage large-current environment.
A switch K and a resistor R which are sequentially connected in series are arranged, and one end of the resistor R, which is far away from the switch K, is grounded; for the fault phase (here, phase C), grounding is equivalent to connecting a grounding switch in parallel with a capacitance to ground, and the low-voltage side of the switch is connected with a resistor R in series to simulate the condition of different grounding resistances.
A fault phase detection device is arranged on the C phase and is positioned on a power supply side voltage transformer and a load sideBetween the voltage transformers; one end of the switch K far away from the resistor R is connected with the fault phase detection device and provides fault grounding current I for the fault phase detection deviceg(ii) a And the C-phase circuit is connected with the fault phase detection device and provides C-phase voltage for the fault phase detection device. When a primary large current is obtained by means of up-flow in series on a primary line, the fault phase detection device can only be installed behind the fault ground point, i.e. between the switch K and the load side voltage transformer, because if it is installed in front of the fault ground point, the fault phase detection device will also amplify the fault current by N times at the same time, which is not the case in practice.
According to the invention, through the steps, the evaluation of the metering performance of the electric energy metering device is realized when the single-phase earth fault occurs, and through the design of the detection device, the working condition that the detection device works under the high-current high-voltage condition under the condition of a low-load state is realized, so that the blank of the prior art is made up.
Further, the non-fault phase detection device and the fault phase detection device have the same structure, and the non-fault phase detection device comprises a power supply side current transformer T1, a current booster T2 and a load side current transformer T3; and the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a loop.
When the invention is applied, the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a loop to form a detection loop, the current condition on a line is detected, and meanwhile, the electric energy metering device also needs a current transformer besides a voltage transformer, so that the power supply side current transformer T1 is a part of the power supply side electric energy metering device, and the load side current transformer T3 is a part of the load side electric energy metering device, thereby realizing the electric energy metering of the electric energy metering device on the line.
Furthermore, one end of a current booster T2 in the non-fault phase detection device is connected with an A-phase line; one end of the power supply side current transformer T1 is connected with a grounding capacitor CAThe high voltage end of (2).
When the invention is applied, the large electricity can be obtained through the current booster T2 by the arrangementCurrent, while obtaining high voltage through direct wiring with the line, and the power supply side electric energy metering device obtains grounding capacitance CACurrent I at high voltage endCAThereby realizing current detection.
Furthermore, one end of a current booster T2 in the fault phase detection device is connected with a C-phase line; one end of the power supply side current transformer T1 is connected with one end of the switch K far away from the resistor R.
Further, the primary side of the current booster T2 is disposed on a line of a failed phase or a non-failed detection phase, and the secondary side of the current booster T2 is connected to the power supply side current transformer T1 and the load side current transformer T3.
When the invention is applied, the high current can be obtained through the current booster T2 through the arrangement, the high voltage can be obtained through the wiring, and the fault grounding current I can be obtainedgThereby realizing current detection.
Further, the iron core of the current booster T2 adopts an annular structure, and an input line passes through the inner ring of the annular structure.
Further, the three-phase line of the high-voltage system supplies power to a load through a step-down transformer.
Further, the grounding capacitance of the a-phase and/or B-phase line is grounded through the phase adjusting unit.
When the invention is applied, a phase adjusting unit is connected in series at the low-voltage side of the grounding capacitor, thereby ensuring that I is not influenced after a current transformer at the power supply side is connected in series with the capacitorCAThe phase of (c).
The method for acquiring the metering performance of the electric energy metering device under the condition of single-phase earth fault comprises the following steps: selecting a phase C as a fault phase and a phase A as a fault detection phase on a three-phase line of the high-voltage system, and selecting a phase A as a non-fault detection phase; closing the switch K, and forming a power supply side electric energy metering device by using a power supply side current transformer T1, a power supply side voltage transformer and a power supply side electric energy meter, and forming a load side electric energy metering device by using a load side current transformer T3, a load side voltage transformer and a load side electric energy meter; and comparing the data of the power supply side electric energy metering device with the data of the load side electric energy metering device and acquiring the metering performance of the electric energy metering device.
Further, the method also comprises the following steps: and selecting one phase A and one phase B as a non-fault detection phase at the same time, and arranging non-fault phase detection devices on both the one phase A and the one phase B.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the system and the method for acquiring the metering performance of the electric energy metering device under the single-phase earth fault are provided with the steps, so that the metering performance of the electric energy metering device is evaluated when the single-phase earth fault is detected, the working condition that the electric energy metering device works at a large current and a high voltage under the condition of low load is realized through the design on the detection device, and the blank of the prior art is made up.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic diagram of a single phase earth fault of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in figures 1 and 2 of the drawings,
the system for acquiring the metering performance of the electric energy metering device under the single-phase ground fault selects a phase C as a fault phase on a three-phase circuit of a high-voltage system, selects a phase A as a non-fault detection phase, and sets a ground capacitor on each phase of the three-phase circuit; a power supply side voltage transformer is arranged on the power supply side of the three-phase line, and a load side voltage transformer is arranged on the load side of the three-phase line; a phase is provided with a non-fault phase detection device which is positioned on a power supply side voltage transformer and a load side voltage transformerTo (c) to (d); the non-fault phase detection device passes through the grounding capacitor C of the phase AAGrounded and grounded capacitance CAIs connected to the non-fault phase detection device and provides a grounding capacitor C for the non-fault phase detection deviceACurrent I at high voltage endCA(ii) a The A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device; a fault phase detection device is arranged on the phase C and is positioned between a power supply side voltage transformer and a load side voltage transformer; the fault phase detection device is also sequentially connected with a switch K and a resistor R which are connected in series, one end of the resistor R far away from the switch K is grounded, and the fault phase detection device receives a fault grounding current Ig(ii) a And the C-phase circuit is connected with the fault phase detection device and provides C-phase voltage for the fault phase detection device.
In this embodiment, a phase C is selected as a fault phase on a three-phase line of the high-voltage system, and a phase a or/and a phase B is selected as a non-fault detection phase, and each phase on the three-phase line is provided with a ground capacitor, where the ground capacitor is used for a ground capacitor of an analog line. The method comprises the steps that a power supply side voltage transformer is arranged on a power supply side of a three-phase line, a load side voltage transformer is arranged on a load side of the three-phase line, in order to compare and test the performance of electric energy metering devices on the power supply side and the load side, electric energy metering devices are required to be arranged on the two parts, for the three-phase four-line type electric energy metering devices, detection devices are required to be arranged on an A phase and a B phase simultaneously to provide current for the three-phase four-line type electric energy metering devices, for the three-phase three-line type electric energy metering devices, only one phase needs to be selected to be provided with the detection devices to provide current for the three-phase three-line type electric energy metering devices, the load side voltage transformer is a part of the load side electric energy metering devices, and the power supply side voltage transformer is.
Arranging a non-fault phase detection device on the A phase or/and the B phase, wherein the non-fault phase detection device is positioned between a power supply side voltage transformer and a load side voltage transformer; the non-fault phase detection device passes through the grounding capacitor C of the phase AAGrounded and grounded capacitance CAHigh pressure ofThe terminal is connected to the non-fault phase detection device and provides a grounding capacitor C for the non-fault phase detection deviceACurrent I at high voltage endCA(ii) a The A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device; in order to detect the electric energy metering device, the current in the line needs to be detected, and the detection device also needs to be maintained in a large-current high-voltage environment, so that the grounding capacitor C is provided for the non-fault phase detection device at the momentACurrent I at high voltage endCAAnd a current booster in the non-fault phase detection device provides a large current, and the A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device to ensure that the non-fault phase detection device operates in a high-voltage large-current environment.
A switch K and a resistor R which are sequentially connected in series are arranged, and one end of the resistor R, which is far away from the switch K, is grounded; for the fault phase (here, phase C), grounding is equivalent to connecting a grounding switch in parallel with a capacitance to ground, and the low-voltage side of the switch is connected with a resistor R in series to simulate the condition of different grounding resistances.
A fault phase detection device is arranged on the phase C and is positioned between a power supply side voltage transformer and a load side voltage transformer; one end of the switch K far away from the resistor R is connected with the fault phase detection device and provides fault grounding current I for the fault phase detection deviceg(ii) a And the C-phase circuit is connected with the fault phase detection device and provides C-phase voltage for the fault phase detection device. When a primary large current is obtained by means of up-flow in series on a primary line, the fault phase detection device can only be installed behind the fault ground point, i.e. between the switch K and the load side voltage transformer, because if it is installed in front of the fault ground point, the fault phase detection device will also amplify the fault current by N times at the same time, which is not the case in practice.
According to the invention, through the steps, the evaluation of the metering performance of the electric energy metering device is realized when the single-phase earth fault occurs, and through the design of the detection device, the detection device is enabled to work under the working condition of large current and high voltage under the condition of low load, so that the blank in the prior art is made up.
Example 2
In this embodiment, on the basis of embodiment 1, the non-fault phase detection device and the fault phase detection device have the same structure, and the non-fault phase detection device includes a power supply side current transformer T1, a current booster T2, and a load side current transformer T3; and the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a loop.
In the implementation of this embodiment, the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a detection loop, so as to detect the current condition on the line, and the electric energy metering device needs a current transformer in addition to a voltage transformer, so that the power supply side current transformer T1 is a part of the power supply side electric energy metering device, and the load side current transformer T3 is a part of the load side electric energy metering device, thereby realizing the electric energy metering in the line by the electric energy metering device.
Example 3
In this embodiment, on the basis of embodiment 2, one end of the current booster T2 in the non-faulty phase detection apparatus is connected to the a-phase line; one end of the power supply side current transformer T1 is connected with a grounding capacitor CAThe high voltage end of (2).
In the implementation of the embodiment, the current booster T2 can be used for obtaining large current, the direct connection with the circuit is used for obtaining high voltage, and the power supply side electric energy metering device is used for obtaining the grounding capacitor CACurrent I at high voltage endCAThereby realizing current detection.
Example 4
In this embodiment, on the basis of embodiment 2, one end of the current booster T2 in the failed phase detection device is connected to the C-phase line; one end of the power supply side current transformer T1 is connected with one end of the switch K far away from the resistor R. The primary side of the current booster T2 is arranged on a line of a fault phase or a non-fault detection phase, and the secondary side of the current booster T2 is connected with a power supply side current transformer T1 and a load side current transformer T3.
In the implementation of the embodiment, the large current can be obtained through the current booster T2 by the arrangementWhile obtaining high voltage through the wiring and obtaining fault grounding current IgThereby realizing current detection.
Example 5
In this embodiment, on the basis of embodiment 1, the grounding capacitance of the a-phase and/or B-phase line is grounded through the phase adjusting unit.
When the embodiment is implemented, the phase adjusting unit is connected in series with the low-voltage side of the grounding capacitor, so that the condition that I is not influenced after the current transformer at the power supply side is connected in series with the capacitor is ensuredCAThe phase of (c).
Example 6
As shown in fig. 1 and 2, in this embodiment, in addition to embodiments 1 to 5, the respective phase currents in the single-phase ground fault flow schematically as shown in fig. 1 (taking a 10kV three-phase four-wire power metering device as an example), and it is known from the existing research results that when a single-phase ground fault occurs, neither the capacitance current nor the fault current of each phase flows through the power metering device on the load side (i.e., the current transformer on the load side), but flows through the power metering device on the power supply side (i.e., the current transformer on the power supply side). Therefore, when a large primary current is obtained by connecting a current booster in series with a primary line for current boost, the current booster can be installed only behind a fault grounding point (i.e., on the load side), because if it is installed in front of the fault grounding point, the current booster will also amplify the fault current by N times at the same time, which is not the same as the actual situation. If installed behind the fault ground (i.e., on the load side), the current booster amplifies only the load current.
In FIG. 1, at fault, IA＝IA1+ICA，IB＝IB1+IB，IC＝Ig+IC1(ii) a Wherein IA1、IB1、IC1Respectively the load current of each phase, ICA、ICAA, B phases of capacitive current (at fault); i isgIs a fault current of a fault phase (C phase), and Ig＝ICA+ICB。
From the above analysis, a quantitative performance comparison scheme can be obtained as shown in FIG. 2. Current booster for converting load current IA1Rise to N x IA1(N is the transformation ratio of the current booster), the current transformer on the load side and the current transformer on the power supply side both have current N × I at the momentA1However, the actual current of the source side current transformer should be N x IA1+ICA(taking phase A as an example), therefore, one end of the current transformer at the power supply side is connected on the line, the other end is connected on the high-voltage side of the capacitor, the current transformer at the power supply side is connected with the earth capacitor at the phase A simultaneously, and the actual current N I in fault is obtainedA1+ICA. In order to reduce the influence on the angular difference, a phase adjusting unit is connected in series at the low-voltage side of the ground capacitor, so that the I is not influenced after the current transformer at the power supply side is connected with the capacitor in seriesCAThe phase of (c). Compared with the impedance of the capacitor in series connection, the impedance of the current transformer on the power supply side is very small and almost negligible, so that the impedance of the current transformer on the power supply side is ICAHas little effect on the size of (c). For the fault phase (here, phase C), grounding is equivalent to connecting a grounding switch in parallel with a capacitance to ground, and the low-voltage side of the switch is connected with a resistor R in series to simulate the condition of different grounding resistances. Connecting one end of a current transformer at the power supply side to a circuit, and connecting the other end of the current transformer at the high voltage side of a switch, so that the current transformer at the power supply side is connected with a grounding switch of the C phase in series at the same time, and the actual current N x I at the time of failure is obtainedC1+Ig. Other parts of metering devices such as a voltage transformer, an electric energy meter and the like are connected according to the existing connection mode, so that the electric energy comparison of the electric energy metering device on the power supply side and the load side is realized.
Example 7
The invention relates to a system for acquiring the metering performance of an electric energy metering device under a single-phase ground fault, which selects a phase C as a fault phase on a three-phase circuit of a high-voltage system, selects a phase A or/and a phase B as a non-fault detection phase, and sets a ground capacitor on each phase of the three-phase circuit;
a power supply side voltage transformer is arranged on the power supply side of the three-phase line, and a load side voltage transformer is arranged on the load side of the three-phase line;
arranging a non-fault phase detection device on the A phase or/and the B phase, wherein the non-fault phase detection device is positioned between a power supply side voltage transformer and a load side voltage transformer; the non-failure phaseThe detection device passes through the grounding capacitor C of the phase AAGrounded and grounded capacitance CAIs connected to the non-fault phase detection device and provides a grounding capacitor C for the non-fault phase detection deviceACurrent I at high voltage endCA(ii) a The A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device;
a switch K and a resistor R which are sequentially connected in series are arranged, and one end of the resistor R, which is far away from the switch K, is grounded;
a fault phase detection device is arranged on the phase C and is positioned between a power supply side voltage transformer and a load side voltage transformer; one end of the switch K far away from the resistor R is connected with a fault phase detection device, and the fault phase detection device receives a fault grounding current Ig(ii) a And the C-phase circuit is connected with the fault phase detection device and provides C-phase voltage for the fault phase detection device.
The non-fault phase detection device and the fault phase detection device have the same structure, and the non-fault phase detection device comprises a power supply side current transformer T1, a current booster T2 and a load side current transformer T3; and the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a loop.
In this embodiment, a phase C is selected as a fault phase and used as a fault detection phase on a three-phase line of a high-voltage system, and a phase a or/and a phase B is selected as a non-fault detection phase, and each phase on the three-phase line is provided with a ground capacitor, where the ground capacitor is used for simulating a ground capacitor of the line. A power supply side voltage transformer is arranged on the power supply side of the three-phase line, a load side voltage transformer is arranged on the load side of the three-phase line, in order to compare and test the electrical performance of the electrical energy metering devices with different electrical performance on the power supply side and the load side, the electrical energy metering devices are required to be arranged on the two parts, for the three-phase four-wire type electric energy metering device, the detection devices are required to be simultaneously arranged on the A phase, the B phase and the C phase to provide current for the three-phase four-wire type electric energy metering device, for the three-phase three-line type electric energy metering device, only one phase is selected between the A phase and the B phase to carry out non-fault phase detection, and fault phase detection is carried out on the C phase to provide current for a three-phase three-wire type electric energy metering device, wherein a load side voltage transformer is a part of the load side electric energy metering device, and a power supply side voltage transformer is a part of the power supply side electric energy metering device.
Arranging a non-fault phase detection device on the A phase or/and the B phase, wherein the non-fault phase detection device is positioned between a power supply side voltage transformer and a load side voltage transformer; the non-fault phase detection device passes through the grounding capacitor C of the phase AAGrounded and grounded capacitance CAIs connected to the non-fault phase detection device and provides a grounding capacitor C for the non-fault phase detection deviceACurrent I at high voltage endCA(ii) a The A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device; in order to detect the electric energy metering device, the current in the line needs to be detected, and the detection device also needs to be maintained in a large-current high-voltage environment, so that the grounding capacitor C is provided for the non-fault phase detection device at the momentACurrent I at high voltage endCAAnd a current booster in the non-fault phase detection device provides a large current, and the A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device to ensure that the non-fault phase detection device operates in a high-voltage large-current environment.
A switch K and a resistor R which are sequentially connected in series are arranged, and one end of the resistor R, which is far away from the switch K, is grounded; for the fault phase (here, phase C), grounding is equivalent to connecting a grounding switch in parallel with a capacitance to ground, and the low-voltage side of the switch is connected with a resistor R in series to simulate the condition of different grounding resistances.
A fault phase detection device is arranged on the phase C and is positioned between a power supply side voltage transformer and a load side voltage transformer; one end of the switch K far away from the resistor R is connected with the fault phase detection device and provides fault grounding current I for the fault phase detection deviceg(ii) a And the C-phase circuit is connected with the fault phase detection device and provides C-phase voltage for the fault phase detection device. When a primary large current is obtained by means of current rising in series in a primary line, the fault phase detection device can only be installed behind the fault grounding point, i.e. the fault phase detection device is installed behind the fault grounding pointThis is not the case with the case where the fault phase detection device would also amplify the fault current N times at the same time if installed in front of the fault earth point, between the switch K and the load side voltage transformer.
Example 8
The invention relates to a method for acquiring the metering performance of an electric energy metering device under a single-phase ground fault, which selects a phase C as a fault phase and a fault detection phase on a three-phase line of a high-voltage system, and selects a phase A as a non-fault detection phase; closing the switch K, and forming a power supply side electric energy metering device by using a power supply side current transformer T1, a power supply side voltage transformer and a power supply side electric energy meter, and forming a load side electric energy metering device by using a load side current transformer T3, a load side voltage transformer and a load side electric energy meter; and comparing the data of the power supply side electric energy metering device with the data of the load side electric energy metering device and acquiring the metering performance of the electric energy metering device. And selecting one phase A and one phase B as a non-fault detection phase at the same time, and arranging non-fault phase detection devices on both the one phase A and the one phase B. The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The system for acquiring the metering performance of the electric energy metering device under the single-phase ground fault is characterized in that one phase C is selected as a fault phase on a three-phase circuit of a high-voltage system, one phase A is selected as a non-fault detection phase, and each phase on the three-phase circuit is provided with a ground capacitor;
a power supply side voltage transformer is arranged on the power supply side of the three-phase line, and a load side voltage transformer is arranged on the load side of the three-phase line;
a non-fault phase detection device is arranged on the phase A and is positioned between a power supply side voltage transformer and a load side voltage transformer; the non-failure phase detection device passes through APhase earth capacitance CAGrounded and grounded capacitance CAIs connected to the non-fault phase detection device and provides a grounding capacitor C for the non-fault phase detection deviceACurrent I at high voltage endCA(ii) a The A-phase circuit is connected with the non-fault phase detection device and provides an A-phase voltage for the non-fault phase detection device;
a fault phase detection device is arranged on the phase C and is positioned between a power supply side voltage transformer and a load side voltage transformer; the fault phase detection device is also sequentially connected with a switch K and a resistor R which are connected in series, one end of the resistor R far away from the switch K is grounded, and the fault phase detection device receives a fault grounding current Ig(ii) a The C-phase circuit is connected with the fault phase detection device and provides a C-phase voltage for the fault phase detection device; the non-fault phase detection device and the fault phase detection device have the same structure and respectively comprise a power supply side current transformer T1, a current booster T2 and a load side current transformer T3; the power supply side current transformer T1, the current booster T2 and the load side current transformer T3 are sequentially connected and closed to form a loop; one end of a current booster T2 in the non-fault phase detection device is connected with an A-phase line; one end of a power supply side current transformer T1 in the non-fault phase detection device is connected with a grounding capacitor CAThe high voltage end of (a);
one end of a current booster T2 in the fault phase detection device is connected with a C-phase line; one end of a power supply side current transformer T1 in the fault phase detection device is connected with one end of a switch K far away from a resistor R;
the primary side of the current booster T2 is arranged on a line of a fault phase or a non-fault detection phase, and the secondary side of the current booster T2 is connected with a power supply side current transformer T1 and a load side current transformer T3.
2. The system for obtaining the metering performance of the electric energy metering device under the condition of the single-phase ground fault according to claim 1, wherein the iron core of the current booster T2 is of an annular structure, and an input line passes through the inner ring of the annular structure.
3. The system for obtaining the metering performance of the electric energy metering device under the single-phase ground fault condition of claim 1, wherein a three-phase line of the high-voltage system supplies power to a load through a step-down transformer.
4. The system for obtaining the metering performance of the electric energy metering device under the single-phase ground fault is characterized in that the grounding capacitance of the A-phase and/or B-phase line is grounded through the phase adjusting unit.
5. The method for acquiring the metering performance of the electric energy metering device under the condition of single-phase earth fault by adopting the system of any one of claims 1-4 is characterized by comprising the following steps:
selecting a phase C as a fault phase and a phase A as a fault detection phase on a three-phase line of the high-voltage system, and selecting a phase A as a non-fault detection phase;
closing the switch K, and forming a power supply side electric energy metering device by using a power supply side current transformer T1, a power supply side voltage transformer and a power supply side electric energy meter, and forming a load side electric energy metering device by using a load side current transformer T3, a load side voltage transformer and a load side electric energy meter;
comparing the data of the power supply side electric energy metering device and the load side electric energy metering device and acquiring the metering performance of the electric energy metering device;
and selecting one phase A and one phase B as a non-fault detection phase at the same time, and arranging non-fault phase detection devices on both the one phase A and the one phase B.
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