CN112965007B - On-line judging method for turn-to-turn short circuit of generator terminal voltage transformer - Google Patents
On-line judging method for turn-to-turn short circuit of generator terminal voltage transformer Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention discloses an on-line judging method for turn-to-turn short circuit of a generator terminal voltage transformer. Aiming at the problem of false operation of the grounding protection of the generator stator caused by the turn-to-turn short circuit of the generator terminal voltage transformer, the invention provides an on-line judging method of the turn-to-turn short circuit of the generator terminal voltage transformer, which is used for locking a grounding protection tripping outlet of the generator stator. The method judges and positions the turn-to-turn short circuit fault of the voltage transformer by comparing the line voltage amplitude of the three groups of voltage transformers at the generator end, the opening triangular voltage amplitude of the common voltage transformer and the three-phase voltage vector sum amplitude of the voltage transformer for turn-to-turn protection. The distinguishing method provided by the invention has the advantages of simple and reliable principle, wide application range and higher sensitivity, can effectively avoid false operation of the stator ground protection, can distinguish turn-to-turn short circuit faults of three groups of voltage transformers, and has higher application value.
Description
Technical Field
The invention belongs to the technical field of relay protection of power systems, and particularly relates to an on-line judging method for turn-to-turn short circuits of a generator terminal voltage transformer.
Background
The generator stator grounding protection is a generator protection with more action times in the running process of the generator, and besides the generator stator grounding protection action caused by the insulation fault of the generator stator winding, the generator stator grounding protection action caused by the external fault of the generator is more, wherein the turn-to-turn short circuit of the generator terminal voltage transformer is a common fault. According to the theoretical derivation of the analysis of stator grounding protection action caused by turn-to-turn short circuit of a generator end voltage transformer, when the turn-to-turn short circuit of a primary winding of a common TV of the generator end occurs, zero-sequence voltage to the ground occurs at the generator end and a neutral point, and the zero-sequence voltage is similar to the electrical characteristics of single-phase grounding faults of the stator, so that the grounding protection action of the stator with the fundamental zero-sequence voltage can be possibly caused.
Because the value of the voltage transformer is lower than that of the generator, the importance of the voltage transformer is lower in the overhaul process, so that the unplanned outage of the generator set caused by turn-to-turn short circuit faults of the voltage transformer occurs more recently, and the loss is larger. Therefore, the current technical supervision clearly requires that the power plant performs no-load excitation characteristic test on the machine side voltage transformer once under 1.9 times of rated phase voltage according to the requirements of the power equipment preventive test procedure according to the unit power outage maintenance period and checks whether no-load current meets the standard requirement.
However, there is a lack of on-line detection methods for the voltage transformer in operation. The invention provides an online judging method of turn-to-turn short circuit of a generator terminal voltage air Cheng Jiucheng, which is provided by 201410039668.7, but is only applicable to a unit provided with injection type stator grounding protection, so that the online judging method of turn-to-turn short circuit of the generator terminal voltage transformer, which is applicable to most units, is necessary to be researched, and comprises a unit not provided with injection type stator grounding protection.
Disclosure of Invention
The invention aims to solve the problem of non-stop event of a generator caused by turn-to-turn short circuit fault of a generator terminal voltage transformer, and provides an on-line judging method for turn-to-turn short circuit of the generator terminal voltage transformer.
In order to achieve the above purpose, the present invention is realized by the following technical scheme:
an on-line distinguishing method for turn-to-turn short circuit of a generator terminal voltage transformer comprises the following steps:
1) The method comprises the steps that three groups of voltage transformers TV1, TV2 and TV3 at the generator terminal respectively measure the terminal voltage of a generator, wherein the TV1 and the TV3 are common voltage transformers, and the TV2 is a voltage transformer for turn-to-turn protection of the generator; TV1 measures and obtains the voltage amplitude of the generator line to be |U1ab|, |U1bc| and |U1ca|, and the voltage amplitude of the opening triangle to be |U1t0|; TV2 measures generator line voltage magnitudes of |u2ab|, |u2bc|, and |u2ca|, and let |u2t0|=1/3×|u2ab+u2bc+u2ca|; TV3 measures the line voltage amplitude of the generator as |U3ab|, |U3bc|, and |U3ca|, and the opening triangle voltage amplitude as |U3t0|; the zero sequence voltage amplitude of the neutral point of the generator is |Un0|;
2) Judging whether a turn-to-turn short circuit fault occurs in the generator voltage transformer TV 1; judging that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 3; judging whether a turn-to-turn short circuit fault occurs in the generator voltage transformer TV 2;
3) When the turn-to-turn short circuit of the generator end voltage transformer is judged, a turn-to-turn short circuit alarm signal of the generator end voltage transformer is sent out after set delay, and a generator stator is locked to be grounded to protect a tripping outlet.
The invention is further improved in that in the step 1), the third harmonic component is filtered by adopting a digital filter, and the third harmonic voltage filtering ratio is more than 100.
The invention is further improved that in the step 1), the three groups of voltage transformers at the generator end have 100V open triangle voltage rating, and the generator neutral point considers the transformation ratio of the grounding transformer and the voltage transformation ratio after the secondary side resistance tap of the grounding transformer is U N /0.1732kV，U N Rated voltage of the generator; if the opening triangle rated voltage of the three groups of voltage transformers at the generator end is U 1 V，U 1 If not equal to 100V, the opening delta voltage measurement should be multiplied by the proportionality coefficientThen obtaining I U1t 0I, I U2t 0I and I U3t 0I; if the neutral point of the generator considers the transformer transformation ratio of the grounding transformer and the voltage transformation ratio after the secondary side resistance tap of the grounding transformer is U N /U 2 kV, the fundamental zero sequence voltage measured by the neutral point of the generator should be multiplied by the proportionality coefficientThen obtaining the I Un0I.
The invention is further improved in that in the step 2), when the following conditions are simultaneously met, the generator voltage transformer TV1 is judged to have turn-to-turn short circuit fault:
(1) The I U1t 0I is not less than 5V or the I U3t 0I is not less than 5V;
(2)|U2ab|-|U1ab|≤10V；
(3)|U2bc|-|U1bc|≤10V；
(4)|U2ca|-|U1ca|≤10V；
(5)||U1t0|-|Un0||＞3V；
(6)||U1t0|-|U3t0||＞3V。
the invention is further improved in that in the step 2), when the following conditions are simultaneously met, the generator voltage transformer TV3 is judged to have turn-to-turn short circuit fault:
(1) The I U1t 0I is not less than 5V or the I U3t 0I is not less than 5V;
(2)|U2ab|-|U3ab|≤10V；
(3)|U2bc|-|U3bc|≤10V；
(4)|U2ca|-|U3ca|≤10V；
(5)||U3t0|-|Un0||＞3V；
(6)||U3t0|-|U1t0||＞3V。
the invention is further improved in that in the step 2), when the following conditions are simultaneously met, the generator voltage transformer TV2 is judged to have turn-to-turn short circuit fault:
(1) The I U1t 0I is not less than 5V or the I U3t 0I is not less than 5V;
(2)|U1ab|-|U2ab|≤10V；
(3)|U1bc|-|U2bc|≤10V；
(4)|U1ca|-|U2ca|≤10V；
(5)|U3ab|-|U2ab|≤10V；
(6)|U3bc|-|U2bc|≤10V；
(7)|U3ca|-|U2ca|≤10V；
(8)||U2t0|-|Un0||＞3V；
(9)||U2t0|-|U1t0||＞3V；
(10)||U2t0|-|U3t0||＞3V。
the invention is further improved in that in the step 3), after 1s delay, a turn-to-turn short circuit alarm signal of a generator end voltage transformer is generated, and a generator stator is locked to be grounded to protect a tripping outlet.
The invention has at least the following beneficial technical effects:
1. the method can send out an alarm signal in time when the turn-to-turn short circuit of the voltage transformer at the generator end fails, thereby avoiding further development of the failure, creating conditions for transferring the load of the generator and realizing stable shutdown and maintenance, and improving the economic benefit of a power plant.
2. The method can distinguish the turn-to-turn short circuit fault of the generator terminal voltage transformer and the grounding fault of the generator body stator, can avoid the misoperation of the generator stator grounding fault, and can be used as a reference basis for fault analysis and fault positioning.
Compared with the prior art, the invention has the following remarkable advantages:
1. the method for judging the turn-to-turn short circuit of the generator terminal voltage transformer on line is suitable for most of the units which are put into operation, including the units which are not configured with the injection type stator grounding protection.
2. The on-line judging method for the turn-to-turn short circuit of the generator terminal voltage transformer has higher sensitivity, can detect the slight turn-to-turn short circuit fault of the generator terminal voltage transformer, and can distinguish the turn-to-turn short circuit fault of three groups of voltage transformers.
Drawings
Fig. 1, 2 and 3 are protection logic diagrams of the method of the present invention.
The symbols in the drawings are as follows:
the expression logical AND relationship, namely when the input conditions are all satisfied, the output is valid; 1 represents a logical OR relationship, i.e., its output is valid when any of its input conditions are satisfied.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1, fig. 2 and fig. 3, the method for on-line judging turn-to-turn short circuit of a generator terminal voltage transformer provided by the invention comprises the following specific steps:
1) The method comprises the steps that three groups of voltage transformers TV1, TV2 and TV3 at the generator terminal respectively measure the terminal voltage of a generator, wherein the TV1 and the TV3 are common voltage transformers, and the TV2 is a voltage transformer for turn-to-turn protection of the generator; TV1 measures and obtains the voltage amplitude of the generator line to be |U1ab|, |U1bc| and |U1ca|, and the voltage amplitude of the opening triangle to be |U1t0|; TV2 measures generator line voltage magnitudes of |u2ab|, |u2bc|, and |u2ca|, and let |u2t0|=1/3×|u2ab+u2bc+u2ca|; TV3 measures the line voltage amplitude of the generator as |U3ab|, |U3bc|, and |U3ca|, and the opening triangle voltage amplitude as |U3t0|; the zero sequence voltage amplitude of the neutral point of the generator is |Un0|; the third harmonic component is filtered by a digital filter, and the third harmonic voltage filtering ratio is more than 100; three groups of voltage transformers at the generator end are rated to 100V in terms of opening triangular voltage, and the voltage transformation ratio of a neutral point of the generator after the secondary side resistance tap of the grounding transformer is considered to be U N /0.1732kV，U N Rated voltage of the generator; if the opening triangle rated voltage of the three groups of voltage transformers at the generator end is U 1 V，U 1 If not equal to 100V, the opening delta voltage measurement should be multiplied by the proportionality coefficientThen obtaining I U1t 0I, I U2t 0I and I U3t 0I; if the neutral point of the generator considers the transformer transformation ratio of the grounding transformer and the voltage transformation ratio after the secondary side resistance tap of the grounding transformer is U N /U 2 In kV, the fundamental zero sequence voltage measured by the generator neutral point should be multiplied by a proportionality coefficient +.>Then obtaining the I Un0I.
2) When the following conditions are satisfied at the same time, it can be judged that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 1:
(1) The I U1t 0I is not less than 5V or the I U3t 0I is not less than 5V;
(2)|U2ab|-|U1ab|≤10V；
(3)|U2bc|-|U1bc|≤10V；
(4)|U2ca|-|U1ca|≤10V；
(5)||U1t0|-|Un0||＞3V；
(6)||U1t0|-|U3t0||＞3V；
when the following conditions are satisfied at the same time, it can be judged that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 3: (1) U1t0 is more than or equal to 5V or U3t0 is more than or equal to 5V;
(2)|U2ab|-|U3ab|≤10V；
(3)|U2bc|-|U3bc|≤10V；
(4)|U2ca|-|U3ca|≤10V；
(5)||U3t0|-|Un0||＞3V；
(6)||U3t0|-|U1t0||＞3V；
when the following conditions are satisfied at the same time, it can be judged that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 2: (1) U1t0 is more than or equal to 5V or U3t0 is more than or equal to 5V;
(2)|U1ab|-|U2ab|≤10V；
(3)|U1bc|-|U2bc|≤10V；
(4)|U1ca|-|U2ca|≤10V；
(5)|U3ab|-|U2ab|≤10V；
(6)|U3bc|-|U2bc|≤10V；
(7)|U3ca|-|U2ca|≤10V；
(8)||U2t0|-|Un0||＞3V；
(9)||U2t0|-|U1t0||＞3V；
(10)||U2t0|-|U3t0||＞3V；
3) When the turn-to-turn short circuit of the generator end voltage transformer is judged, a 1s delay is carried out to send out an alarm signal of the turn-to-turn short circuit of the generator end voltage transformer, and a generator stator is locked to be grounded to protect a tripping outlet.
Examples:
the article "analysis of generator outlet PT inter-turn short circuit faults" (Liu Huijuan) analyzes the generator outlet PT inter-turn short circuit accidents together. The PT transformation ratio of the generator end is as followsThe generator neutral point ground transformation ratio is 20/0.23 (the neutral point is grounded through a single-phase transformer). The generator neutral point is grounded by a single-phase transformer through a secondary side resistor (with a middle tap, a secondary resistor r=0.51Ω and a secondary tap r=0.384 Ω), so the actual secondary voltage of the access protection device is 173V. When the generator terminal PT turn-to-turn short circuit fault occurs, the generator terminal and the generator neutral point simultaneously generate zero sequence voltage, the generator terminal zero sequence voltage is 12.8V, the neutral point zero sequence voltage is 17.5V, the zero sequence voltage exceeds the generator stator grounding protection fixed value by 15V, and the protection action is performed in tripping and stopping.
The accident is analyzed by adopting the method for distinguishing the turn-to-turn short circuit of the generator terminal voltage transformer.
Since the generator end opening delta rated voltage is 100V, the generator neutral point considers the voltage transformation ratio after the secondary side resistance tap of the grounding transformer to be 20/0.173kV, so |u1t0|=12.8v, |un 0|=17.5v.
Because the zero sequence voltage of the machine end is |U1t0|=12.8 >5V, a judging program of the turn-to-turn short circuit of the voltage transformer of the machine end of the generator is started. Meanwhile, the fact that the sampling voltages of two groups of common voltage transformers at the machine end are basically the same is considered, namely the conditions that the voltage of I U2 ab-I U1 ab-I is less than or equal to 10V, the voltage of I U2 bc-I U1 bc-I is less than or equal to 10V and the voltage of I U2 ca-I U1 ca-I is less than or equal to 10V are met, and therefore zero sequence voltage at the machine end of the generator can be judged not to be generated due to PT disconnection; meanwhile, the difference value of the machine end zero sequence voltage and the neutral point zero sequence voltage is U1t 0-Un 0-4.7V & gt3V, so that the inter-turn short circuit fault of the generator machine end voltage transformer can be judged. By the method, after the turn-to-turn short circuit of the voltage transformer at the generator end is successfully judged, the protection device automatically locks the grounding protection of the stator of the generator, so that the occurrence of the accident of stopping the generator can be avoided.
Claims (3)
1. The on-line judging method for the turn-to-turn short circuit of the generator terminal voltage transformer is characterized by comprising the following steps of:
1) Three groups of voltage transformers TV1, TV2 and TV3 at generator end respectivelyMeasuring the terminal voltage of a generator, wherein TV1 and TV3 are common voltage transformers, and TV2 is a voltage transformer for turn-to-turn protection of the generator; TV1 measures and obtains the voltage amplitude of the generator line to be |U1ab|, |U1bc| and |U1ca|, and the voltage amplitude of the opening triangle to be |U1t0|; TV2 measures generator line voltage magnitudes of |u2ab|, |u2bc|, and |u2ca|, and let |u2t0|=1/3×|u2ab+u2bc+u2ca|; TV3 measures the line voltage amplitude of the generator as |U3ab|, |U3bc|, and |U3ca|, and the opening triangle voltage amplitude as |U3t0|; the zero sequence voltage amplitude of the neutral point of the generator is |Un0|; three groups of voltage transformers at the generator end are rated to 100V in terms of opening triangular voltage, and the voltage transformation ratio of a neutral point of the generator after the secondary side resistance tap of the grounding transformer is considered to be U N /0.1732kV，U N Rated voltage of the generator; if the opening triangle rated voltage of the three groups of voltage transformers at the generator end is U 1 V，U 1 If not equal to 100V, the opening delta voltage measurement should be multiplied by the proportionality coefficientThen obtaining I U1t 0I, I U2t 0I and I U3t 0I; if the neutral point of the generator considers the transformer transformation ratio of the grounding transformer and the voltage transformation ratio after the secondary side resistance tap of the grounding transformer is U N /U 2 In kV, the fundamental zero sequence voltage measured by the generator neutral point should be multiplied by a proportionality coefficient +.>Obtaining the I Un0I;
2) Judging whether a turn-to-turn short circuit fault occurs in the generator voltage transformer TV 1; judging that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 3; judging whether a turn-to-turn short circuit fault occurs in the generator voltage transformer TV 2;
when the following conditions are met at the same time, judging that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 1:
(1) The I U1t 0I is not less than 5V or the I U3t 0I is not less than 5V;
(2)|U2ab|-|U1ab|≤10V；
(3)|U2bc|-|U1bc|≤10V；
(4)|U2ca|-|U1ca|≤10V；
(5)||U1t0|-|Un0||＞3V；
(6)||U1t0|-|U3t0||＞3V；
when the following conditions are met at the same time, judging that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 3:
(1) The I U1t 0I is not less than 5V or the I U3t 0I is not less than 5V;
(2)|U2ab|-|U3ab|≤10V；
(3)|U2bc|-|U3bc|≤10V；
(4)|U2ca|-|U3ca|≤10V；
(5)||U3t0|-|Un0||＞3V；
(6)||U3t0|-|U1t0||＞3V；
when the following conditions are met at the same time, judging that the turn-to-turn short circuit fault occurs in the generator voltage transformer TV 2:
(1) The I U1t 0I is not less than 5V or the I U3t 0I is not less than 5V;
(2)|U1ab|-|U2ab|≤10V；
(3)|U1bc|-|U2bc|≤10V；
(4)|U1ca|-|U2ca|≤10V；
(5)|U3ab|-|U2ab|≤10V；
(6)|U3bc|-|U2bc|≤10V；
(7)|U3ca|-|U2ca|≤10V；
(8)||U2t0|-|Un0||＞3V；
(9)||U2t0|-|U1t0||＞3V；
(10)||U2t0|-|U3t0||＞3V；
3) When the turn-to-turn short circuit of the generator end voltage transformer is judged, a turn-to-turn short circuit alarm signal of the generator end voltage transformer is sent out after set delay, and a generator stator is locked to be grounded to protect a tripping outlet.
2. The method for on-line judging turn-to-turn short circuit of the generator terminal voltage transformer according to claim 1, wherein in the step 1), the third harmonic components are filtered by digital filters, wherein the third harmonic voltage filtering ratio is more than 100, and the third harmonic components are filtered by digital filters.
3. The method for on-line judging turn-to-turn short circuit of the generator terminal voltage transformer according to claim 1, wherein in the step 3), after 1s delay, an alarm signal of turn-to-turn short circuit of the generator terminal voltage transformer is generated, and a generator stator grounding protection tripping outlet is locked.
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