CN114252673A - Secondary circuit detection method for voltage transformer of substation - Google Patents
Secondary circuit detection method for voltage transformer of substation Download PDFInfo
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- CN114252673A CN114252673A CN202111396045.1A CN202111396045A CN114252673A CN 114252673 A CN114252673 A CN 114252673A CN 202111396045 A CN202111396045 A CN 202111396045A CN 114252673 A CN114252673 A CN 114252673A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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Abstract
The invention discloses a method for detecting a secondary circuit of a voltage transformer of a substation. The method comprises the steps that a bus tie switch is arranged between a first section of bus and a second section of bus, a voltage transformer and a protection device are arranged on the first section of bus and the second section of bus, and the method also comprises the step of S1, measuring voltage is applied to the secondary side of the voltage transformer on the first section of bus, and measuring parameters of all the protection devices and the voltage transformers on the second section of bus which is not pressurized are obtained; or applying a measurement voltage to the secondary side of the voltage transformer on the second section of the bus to obtain measurement parameters of all the protection devices and the voltage transformer on the unpressurized first section of the bus; the measured voltage is a balanced voltage or an unbalanced voltage; the measurement parameters comprise protection voltage, zero sequence self-generating voltage and opening voltage; and S2, judging the wiring condition of the secondary circuit based on the measurement parameters, wherein the wiring condition comprises normal wiring and abnormal wiring. The method has the technical effect of improving the detection efficiency.
Description
Technical Field
The invention relates to a method for detecting a secondary circuit of a voltage transformer in a substation.
Background
The voltage transformer, PT for short, is a device for transforming voltage, similar to a transformer. The purpose of voltage transformation by the transformer is to facilitate the transmission of electric energy, while the purpose of voltage transformation by the voltage transformer is mainly to sample a measuring instrument and a relay protection device, to measure the voltage, power and electric energy of a line, or to protect valuable equipment, motors and transformers in the line when the line fails. The secondary side of the voltage transformer is not allowed to be short-circuited, and because the internal impedance of the voltage transformer is very small, if a secondary circuit is short-circuited, a very large current can appear, secondary equipment can be damaged, even the voltage transformer is exploded, and relay protection tripping and large-area power failure are caused; the detection of the secondary circuit of the voltage transformer is therefore particularly important.
Referring to fig. 1, in the prior art, an urban rail transit AC 35kv ring network adopts two buses to supply power simultaneously, the two buses adopt a bus tie switch connection mode, and the two buses are normally standby each other; and voltage transformers are arranged on the two sections of buses. The traditional voltage transformer secondary circuit polarity detection method adopts a pointer method, and the test wiring of the traditional voltage transformer polarity test pointer method is shown in figure 2. The positive pole of the battery is connected with the A end of the primary side of the voltage transformer through a small switch s, and the negative pole is connected with the X end of the primary side of the voltage transformer; the direct current milliammeter is connected with the end a of the secondary winding positively and connected with the end x of the secondary winding negatively. When the small switch s is closed, the pointer of the direct current milliammeter swings towards the positive direction, and when the small switch s is opened, the pointer swings towards the negative direction. A, a of the voltage transformer is shown as the same polarity end, and the opposite is true.
In urban rail transit, a primary contact of a voltage transformer of a 35kv switch cabinet is sealed in the switch cabinet, the primary contact cannot be connected, and only three-station disconnecting switches and circuit breakers of adjacent switch cabinets can be closed and loop resistance tester contacts can be worn; in the process of testing by using a pointer method, because the space of a cable bin is very narrow, 4 persons are needed for testing a group of voltage transformers, the time is about 4 hours, the labor cost is high, when testing the residual windings, the swinging of a pointer is very weak, and a novice is difficult to judge whether the secondary wiring of the residual windings of the voltage transformers is correct or not; and the subway construction period is tense, the secondary circuit of the voltage transformer is not detected, the cables of adjacent switch cabinets are installed, and the primary circuit of the voltage transformer cannot be connected, so that the secondary circuit of the voltage transformer cannot be detected.
Disclosure of Invention
The invention provides a method for detecting a secondary circuit of a voltage transformer in a substation, aiming at enhancing the detection capability of the secondary circuit of the voltage transformer, ensuring the safety of power supply equipment and personnel, improving the detection efficiency of the detection personnel and reducing the labor cost.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for detecting the secondary loop of the voltage transformer in a substation comprises the following steps of arranging a bus tie switch between a first section of bus and a second section of bus, arranging the voltage transformer and a protection device on the first section of bus and the second section of bus,
s1, applying a measurement voltage to the secondary side of the voltage transformer on the first section of bus to obtain measurement parameters of all protection devices and the voltage transformer on the unpressurized second section of bus;
or applying a measurement voltage to the secondary side of the voltage transformer on the second section of the bus to obtain measurement parameters of all the protection devices and the voltage transformer on the unpressurized first section of the bus;
the measurement voltage is a balanced voltage or an unbalanced voltage; the measurement parameters comprise protection voltage, zero sequence self-generating voltage and opening voltage;
and S2, judging the wiring condition of the secondary circuit based on the measurement parameters, wherein the wiring condition comprises normal wiring and abnormal wiring.
By adopting the scheme, the measurement voltage applied to the first section of bus can be reversely boosted and transmitted to the second section of bus, and if the protection voltage obtained on the second section of bus is consistent with the measurement voltage value applied to the secondary side of the first section of bus, the wiring is normal; the measuring voltage is applied to the secondary side of the voltage transformer, and is reversely boosted to the primary bus, so that whether short circuit and open circuit exist in primary wiring on the primary bus and the secondary bus can be judged; when measuring, need not once side to a section generating line and two-section generating line and carry out the wiring, can reduce the inspection measurement personnel, improve detection efficiency, and to the 35kv cubical switchboard that once side enclosed with a section generating line and two-section generating line, also can measure.
Optionally, the method comprises the following steps,
101, applying a balance voltage on a secondary side of a voltage transformer on a section of bus;
102, obtaining the protection voltages and zero sequence self-generated voltages of all protection devices on a two-section bus, and measuring the opening voltage of a voltage transformer on the two-section bus;
103, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the opening voltage and the zero sequence self-generating voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are zero, the wiring of the secondary circuit is normal;
and if the measured voltage is not consistent with the protection voltage, the zero sequence self-generated voltage is not zero or the opening voltage is not zero, the wiring of the secondary loop is abnormal.
Optionally, the method comprises the following steps,
201, applying unbalanced voltage on a secondary side of a voltage transformer on a section of bus;
202, obtaining the protection voltages and zero sequence self-generated voltages of all protection devices on the two-section bus, and measuring the opening voltage of a voltage transformer on the two-section bus;
203, calculating a zero sequence self-production voltage preset value based on the measured voltage;
204, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the zero sequence self-generating voltage preset value, the zero sequence self-generating voltage and the opening voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are consistent with the preset value of the zero sequence self-generating voltage, the wiring of the secondary circuit is normal;
and if the measured voltage is inconsistent with the protection voltage value, the zero sequence self-generated voltage is inconsistent with the preset value of the zero sequence self-generated voltage or the opening voltage is inconsistent with the preset value of the zero sequence self-generated voltage, the wiring abnormality of the secondary circuit is indicated.
Optionally, the method comprises the following steps,
301, applying a balance voltage on the secondary side of a voltage transformer on a two-section bus;
302, acquiring the protection voltages and zero sequence self-generated voltages of all protection devices on a section of bus, and measuring the opening voltage of a voltage transformer on the section of bus;
303, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the opening voltage and the zero sequence self-generating voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are zero, the wiring of the secondary circuit is normal;
and if the measured voltage is not consistent with the protection voltage, the zero sequence self-generated voltage is not zero or the opening voltage is not zero, the wiring of the secondary loop is abnormal.
Optionally, the method comprises the following steps,
401, applying unbalanced voltage on the secondary side of a voltage transformer on a two-section bus;
402, acquiring protection voltages and zero sequence self-generated voltages of all protection devices on a section of bus, and measuring the opening voltage of a voltage transformer on the section of bus;
403, calculating a zero sequence self-production voltage preset value based on the measured voltage;
404, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the zero sequence self-generating voltage preset value, the zero sequence self-generating voltage and the opening voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are consistent with the preset value of the zero sequence self-generating voltage, the wiring of the secondary circuit is normal;
and if the measured voltage is inconsistent with the protection voltage value, the zero sequence self-generated voltage is inconsistent with the preset value of the zero sequence self-generated voltage or the opening voltage is inconsistent with the preset value of the zero sequence self-generated voltage, the wiring abnormality of the secondary circuit is indicated.
Optionally, the applied measurement voltage is a three-phase voltage, wherein the three-phase voltage values of the balance voltage are the same, and the phases are different; the three-phase voltage values of the unbalanced voltages are different, and the phases are different.
Optionally, the balancing voltage comprises an a-phase, a b-phase and a c-phase, wherein the a-phase voltage is equal to 5v, the phase is equal to 0 °, the b-phase voltage is equal to 5v, the phase is equal to-120 °, the c-phase voltage is equal to 5v, and the phase is equal to 120 °; the unbalanced voltage includes a1 phase, b1 phase and c1 phase, where a1 phase voltage is 2v, phase angle is 0 °, b1 phase voltage is 3v, phase angle is-120 °, c1 phase voltage is 5v, and phase angle is 120 °.
Optionally, the calculating the zero sequence self-generated voltage preset value specifically includes calculating a vector sum of three-phase voltages.
Optionally, the measurement voltage is applied by a relay protection tester.
Compared with the prior art, the invention has the beneficial effects that: the measured voltage applied to the first section of bus can be reversely boosted and transmitted to the second section of bus, and if the obtained protection voltage of the second section of bus is consistent with the measured voltage value applied to the secondary side of the first section of bus, the wiring is normal; the measuring voltage is applied to the secondary side of the voltage transformer, and is reversely boosted to the primary bus, so that whether short circuit and open circuit exist in primary wiring on the primary bus and the secondary bus can be judged; when measuring, need not once side to a section generating line and two-section generating line and carry out the wiring, can reduce the inspection measurement personnel, improve detection efficiency, and to the 35kv cubical switchboard that once side enclosed with a section generating line and two-section generating line, also can measure.
Description of the drawings:
FIG. 1 is a schematic diagram of a connection between a first bus and a second bus according to the background art of the present invention;
FIG. 2 is a schematic diagram of a pointing method according to the background of the present invention;
FIG. 3 is a schematic diagram of the connection between a first bus or a second bus and a voltage transformer according to the present invention;
FIG. 4 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
A method for detecting a secondary circuit of a voltage transformer in a substation refers to fig. 1, wherein a first section bus and a second section bus are arranged in the substation, the first section bus and the second section bus are connected through a bus tie switch, and the first section bus and the second section bus are both provided with the voltage transformer and a protection device.
The voltage transformer is an instrument for transforming voltage, and the voltage transformer is mainly used for supplying power to a measuring instrument and a protection device, measuring the voltage, the power and the electric energy of a line, or protecting valuable equipment, a motor and a transformer in the line when the line fails, so that the capacity of the voltage transformer is very small, generally only a few volt-amperes and dozens of volt-amperes, and maximally not more than one thousand volt-amperes, and the voltage transformer plays a very important role in the operation process of a substation.
The connection mode of the first-section bus or the second-section bus and the voltage transformer is shown in fig. 3, wherein the voltage transformer is connected with the first-section bus or the second-section bus through three switches k1, k2 and k 3; the other end of the voltage transformer is connected with the protection device through three points a, b and c.
The method for detecting the secondary circuit of the voltage transformer of the substation comprises the following steps,
s1, applying a measurement voltage to the secondary side of the voltage transformer on the first section of bus to obtain measurement parameters of all protection devices and the voltage transformer on the unpressurized second section of bus;
or applying a measurement voltage to the secondary side of the voltage transformer on the second section of the bus to obtain measurement parameters of all the protection devices and the voltage transformer on the unpressurized first section of the bus;
the measured voltage is a balanced voltage or an unbalanced voltage; the measurement parameters include protection voltage, zero sequence self-generated voltage and open circuit voltage.
In a substation, a protection device has the functions of measuring protection voltage on a first section of bus or a second section of bus and calculating zero sequence self-generated voltage, and when the protection voltage and the zero sequence self-generated voltage are obtained, the protection voltage and the zero sequence self-generated voltage can be obtained only by observing the protection device.
And S2, judging the wiring condition of the secondary circuit based on the measurement parameters, wherein the wiring condition comprises normal wiring and abnormal wiring.
In one embodiment, the determination is performed by steps 101-103:
101, applying a balance voltage on the secondary side of a voltage transformer on a section of bus.
The connection structure of the voltage transformer and the section of the bus is shown in fig. 3, the applied measurement voltage is three-phase voltage, and the three points of the voltage transformer are respectively connected with the voltage transformer from a point a, a point b and a point c in the figure; and the three-phase voltage values of the applied balance voltage are the same, and the phases are different.
Specifically, in one embodiment, the balanced voltage includes an a-phase, a b-phase, and a c-phase, where the a-phase voltage is equal to 5v, the phase is equal to 0 °, the b-phase voltage is equal to 5v, the phase is equal to-120 °, the c-phase voltage is equal to 5v, and the phase is equal to 120 °.
The device adopts a high-speed high-performance digital signal processor, has high operation speed and wide transmission frequency band, can generate high-density fitting sine waves of 360 points per cycle for fundamental waves, and can output three-phase voltage meeting the requirements of the embodiment.
And 102, acquiring the protection voltages and zero sequence self-generated voltages of all protection devices on the two-section bus, and measuring the opening voltage of a voltage transformer on the two-section bus.
The protection voltage and the zero sequence self-generating voltage are measured by a protection device on a two-section bus; wherein the opening voltage is obtained by measuring the voltage at x1, a1 in fig. 3.
The measurement results are shown in the following table:
in the table, the phase A, the phase B and the phase C are three-phase voltages measured by a protection device on the two-section bus respectively.
103, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the opening voltage and the zero sequence self-generating voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are both zero, the wiring of the secondary circuit is normal;
and if the measured voltage is not consistent with the protection voltage, the zero sequence self-generated voltage is not zero or the opening voltage is not zero, the wiring of the secondary loop is abnormal.
According to the measured voltage, the method in step 103 is adopted to judge the protection voltage, the open circuit voltage and the zero sequence self-generated voltage in the table, and according to the table, three phases of the protection voltage are obtained: phase A is 5.001, phase B is 4.997, and phase C is 4.997; the measurement error is removed and the voltage value is consistent with the voltage value of the measurement voltage. And zero sequence self-generated voltage is equal to 0, and opening voltage is equal to 0, it can be shown that the secondary circuit of the voltage transformer is normally wired in the detection.
The measured voltage applied to the secondary side of the voltage transformer on the first section of bus can be reversely boosted and inverted onto the first section of bus through the voltage transformer and transmitted onto the second section of bus through the bus tie switch, if the obtained protection voltage on the second section of bus is consistent with the measured voltage value applied to the secondary side on the first section of bus and the zero sequence self-generating voltage and the opening voltage on the second section of bus are zero, the wiring is normal; the method can also judge whether the first and second section buses are short-circuited or open-circuited.
The present embodiment also includes a method of,
201, applying unbalanced voltage on a secondary side of a voltage transformer on a section of bus;
the three-phase voltage values of the unbalanced voltages are different, and the phases are different.
In one embodiment, the unbalanced voltage includes a1 phase, b1 phase, and c1 phase, where a1 phase voltage is 2v, phase is 0 °, b1 phase voltage is 3v, phase is 120 °, c1 phase voltage is 5v, and phase is 120 °.
And 202, acquiring the protection voltages and zero sequence self-generated voltages of all protection devices on the two-section bus, and measuring the open-circuit voltage of a voltage transformer on the two-section bus.
The results obtained on the two-stage bus are shown in the table below,
in the table, the phase A1, the phase B1 and the phase C1 are three-phase voltages measured by a protection device on a two-section bus respectively;
203, calculating a zero sequence self-production voltage preset value based on the measured voltage;
specifically, the method comprises the steps of solving the vector sum of each phase voltage in three-phase voltage; the calculation formula is as follows,
3U0＝(2×∠0)+(3∠×-120)+(5×∠120)；
to obtain U0＝2.65，U0That is, the zero sequence self-generated voltage preset value after the unbalanced voltage is applied in this embodiment.
204, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the zero sequence self-generating voltage preset value, the zero sequence self-generating voltage and the opening voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are consistent with the preset value of the zero sequence self-generating voltage, the wiring of the secondary circuit is normal;
if the measured voltage is inconsistent with the protection voltage value, the zero sequence self-generated voltage is inconsistent with the preset value of the zero sequence self-generated voltage or the opening voltage is inconsistent with the preset value of the zero sequence self-generated voltage, the wiring abnormality of the secondary circuit is indicated.
The measured voltage, the protection voltage, the zero sequence self-generated voltage preset value, the open circuit voltage and the zero sequence self-generated voltage are judged through the step 204 and the contents in the table. Wherein, three phases of the protection voltage: 1.994 for a1 phase, 2.999 for B1 phase, 5.003 for C1 phase; removing measurement errors and enabling the measurement errors to be consistent with three-phase voltage values of unbalanced voltages; the zero sequence self-generating voltage is equal to 2.646, the measurement error is removed, and the zero sequence self-generating voltage is consistent with the preset value of the zero sequence self-generating voltage; the opening voltage is equal to 2.65, and is consistent with the zero sequence self-generated voltage preset value, so that the wiring of the secondary circuit can be normal.
The wiring of the secondary circuit is detected and judged by the two methods, balanced voltage and unbalanced voltage are respectively applied in the detection process, and the two methods are adopted for detection, so that the contrast effect can be formed, and the detection effect is more accurate.
Comprises the following steps of (a) carrying out,
301, applying a balance voltage on the secondary side of a voltage transformer on a two-section bus;
302, acquiring the protection voltages and zero sequence self-generated voltages of all protection devices on a section of bus, and measuring the opening voltage of a voltage transformer on the section of bus;
303, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the opening voltage and the zero sequence self-generating voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are both zero, the wiring of the secondary circuit is normal;
and if the measured voltage is not consistent with the protection voltage, the zero sequence self-generated voltage is not zero or the opening voltage is not zero, the wiring of the secondary loop is abnormal.
The method also comprises the following steps of,
401, applying unbalanced voltage on the secondary side of a voltage transformer on a two-section bus;
402, acquiring protection voltages and zero sequence self-generated voltages of all protection devices on a section of bus, and measuring the opening voltage of a voltage transformer on the section of bus;
403, calculating a zero sequence self-production voltage preset value based on the measured voltage;
404, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the zero sequence self-generating voltage preset value, the zero sequence self-generating voltage and the opening voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are consistent with the preset value of the zero sequence self-generating voltage, the wiring of the secondary circuit is normal;
if the measured voltage is inconsistent with the protection voltage value, the zero sequence self-generated voltage is inconsistent with the preset value of the zero sequence self-generated voltage or the opening voltage is inconsistent with the preset value of the zero sequence self-generated voltage, the wiring abnormality of the secondary circuit is indicated.
During detection, firstly, the method in the steps 101-103 and 201-204 is adopted to apply balanced voltage and unbalanced voltage to the secondary side of a section of bus respectively, and the secondary side wiring condition of the voltage transformer is detected and judged. And then, the method in the steps 301-. Through many judgments, the accuracy of detection judgment can be improved.
When measuring, need not once side to one section generating line and two-stage segment generating line carry out the wiring, can reduce the inspection measurement personnel, improve detection efficiency, and to the cubical switchboard that cable has been laid to the enterprising, being qualified for the next round of competitions of one section generating line and two-stage segment generating line, also can measure.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A method for detecting a secondary circuit of a voltage transformer in a substation is characterized in that a bus tie switch is arranged between a first section of bus and a second section of bus, and the first section of bus and the second section of bus are both provided with the voltage transformer and a protection device,
s1, applying a measurement voltage to the secondary side of the voltage transformer on the first section of bus to obtain measurement parameters of all protection devices and the voltage transformer on the unpressurized second section of bus;
or applying a measurement voltage to the secondary side of the voltage transformer on the second section of the bus to obtain measurement parameters of all the protection devices and the voltage transformer on the unpressurized first section of the bus;
the measurement voltage is a balanced voltage or an unbalanced voltage; the measurement parameters comprise protection voltage, zero sequence self-generating voltage and opening voltage;
and S2, judging the wiring condition of the secondary circuit based on the measurement parameters, wherein the wiring condition comprises normal wiring and abnormal wiring.
2. The method for detecting the secondary circuit of the voltage transformer of the substation according to claim 1, characterized by comprising the following steps,
101, applying a balance voltage on a secondary side of a voltage transformer on a section of bus;
102, obtaining the protection voltages and zero sequence self-generated voltages of all protection devices on a two-section bus, and measuring the opening voltage of a voltage transformer on the two-section bus;
103, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the opening voltage and the zero sequence self-generating voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are zero, the wiring of the secondary circuit is normal;
and if the measured voltage is not consistent with the protection voltage, the zero sequence self-generated voltage is not zero or the opening voltage is not zero, the wiring of the secondary loop is abnormal.
3. The method for detecting the secondary circuit of the voltage transformer of the substation according to claim 1, characterized by comprising the following steps,
201, applying unbalanced voltage on a secondary side of a voltage transformer on a section of bus;
202, obtaining the protection voltages and zero sequence self-generated voltages of all protection devices on the two-section bus, and measuring the opening voltage of a voltage transformer on the two-section bus;
203, calculating a zero sequence self-production voltage preset value based on the measured voltage;
204, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the zero sequence self-generating voltage preset value, the zero sequence self-generating voltage and the opening voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are consistent with the preset value of the zero sequence self-generating voltage, the wiring of the secondary circuit is normal;
and if the measured voltage is inconsistent with the protection voltage value, the zero sequence self-generated voltage is inconsistent with the preset value of the zero sequence self-generated voltage or the opening voltage is inconsistent with the preset value of the zero sequence self-generated voltage, the wiring abnormality of the secondary circuit is indicated.
4. The method for detecting the secondary circuit of the voltage transformer of the substation according to claim 2, characterized by comprising the following steps,
301, applying a balance voltage on the secondary side of a voltage transformer on a two-section bus;
302, acquiring the protection voltages and zero sequence self-generated voltages of all protection devices on a section of bus, and measuring the opening voltage of a voltage transformer on the section of bus;
303, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the opening voltage and the zero sequence self-generating voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are zero, the wiring of the secondary circuit is normal;
and if the measured voltage is not consistent with the protection voltage, the zero sequence self-generated voltage is not zero or the opening voltage is not zero, the wiring of the secondary loop is abnormal.
5. The method for detecting the secondary circuit of the voltage transformer of the substation according to the claim 3, characterized by comprising the following steps,
401, applying unbalanced voltage on the secondary side of a voltage transformer on a two-section bus;
402, acquiring protection voltages and zero sequence self-generated voltages of all protection devices on a section of bus, and measuring the opening voltage of a voltage transformer on the section of bus;
403, calculating a zero sequence self-production voltage preset value based on the measured voltage;
404, judging the wiring condition of the secondary circuit based on the measured voltage, the protection voltage, the zero sequence self-generating voltage preset value, the zero sequence self-generating voltage and the opening voltage,
if the measured voltage is consistent with the protection voltage, and the zero sequence self-generating voltage and the opening voltage are consistent with the preset value of the zero sequence self-generating voltage, the wiring of the secondary circuit is normal;
and if the measured voltage is inconsistent with the protection voltage value, the zero sequence self-generated voltage is inconsistent with the preset value of the zero sequence self-generated voltage or the opening voltage is inconsistent with the preset value of the zero sequence self-generated voltage, the wiring abnormality of the secondary circuit is indicated.
6. A substation voltage transformer secondary circuit detection method according to any one of claims 1-4, characterized in that the applied measurement voltage is a three-phase voltage, wherein the three-phase voltage values of the balance voltage are the same and the phases are different; the three-phase voltage values of the unbalanced voltages are different, and the phases are different.
7. The method for detecting the secondary circuit of the voltage transformer of the substation according to claim 6, wherein the balanced voltage comprises an a phase, a b phase and a c phase, wherein the a phase voltage is 5v, the phase is 0 °, the b phase voltage is 5v, the phase is 120 °, the c phase voltage is 5v, and the phase is 120 °; the unbalanced voltage includes a1 phase, b1 phase and c1 phase, where a1 phase voltage is 2v, phase angle is 0 °, b1 phase voltage is 3v, phase angle is-120 °, c1 phase voltage is 5v, and phase angle is 120 °.
8. The method for detecting the secondary circuit of the voltage transformer of the substation according to claim 6, wherein the calculating the zero sequence self-generated voltage preset value specifically comprises summing vectors of three-phase voltages.
9. The method for detecting the secondary circuit of the transformer substation voltage transformer according to claim 6, wherein the measurement voltage is applied through a relay protection tester.
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