CN111490529B - High-voltage bus protection method combining arc light characteristics - Google Patents
High-voltage bus protection method combining arc light characteristics Download PDFInfo
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- CN111490529B CN111490529B CN202010392194.XA CN202010392194A CN111490529B CN 111490529 B CN111490529 B CN 111490529B CN 202010392194 A CN202010392194 A CN 202010392194A CN 111490529 B CN111490529 B CN 111490529B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
- H02H1/0015—Using arc detectors
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Abstract
The high-voltage bus protection method combining arc light characteristics is characterized in that an arc light detector is additionally arranged on the high-voltage bus, and a novel relay protection principle and method are constructed by combining an arc light discrimination principle with electric quantity protection consisting of substation bus voltage and three-phase current of a breaker. According to the invention, the bus arc light detector is additionally arranged, the arc light distinguishing element is additionally arranged in the bus protection, and the bus arc light distinguishing element is combined with the electric quantity protection, so that the rapidity of protection action can be ensured under the abnormal conditions of CT disconnection, PT disconnection and CT saturation, the bus protection action can be accelerated under the high resistance or oscillation condition, the fault removal time of the bus is shortened, the reliability of the bus protection is improved, and the safety of a large power grid power system is improved.
Description
Technical Field
The invention relates to the field of relay protection of a power system, in particular to a principle and a method for constructing novel high-voltage bus protection by combining an arc light detection and judgment method with bus electric quantity protection.
Background
Various electrical short circuit faults can cause arc light, the arc light energy is huge, the destructive power is remarkable, and the arc light can exist all the time as long as the system is not powered off. In the early 70 s of the last century, foreign experts and scholars began to study the phenomena, mechanisms and hazards of arc faults and made different principle protection schemes according to various characteristics of the arc faults. In the end of the 70 s, soviet union began to develop arc short-circuit protection devices for switchgear assemblies by utilizing various arc phenomena, such as valve type arc protection relays and wire arc relays, which are operated by generating heat pressure from an arc, arc receiving antenna protection, which is operated by generating electromagnetic energy from an arc, and arc protection, which is formed by using photoresistors.
The existing arc protection is mainly used for fast protection of medium and low voltage alternating current and direct current buses and converter equipment below 110kV, and takes an arc light signal generated when primary power equipment fails as a main criterion, and other fault quantities such as a current signal and the like as auxiliary criteria, and a protection device for responding to the fault equipment is quickly cut off through an outlet. The method mainly utilizes an electric arc sensor to sense the intensity of electric arc light and combines the current characteristics as a criterion. Before the pressure and temperature of the fault switch cabinet are increased sharply due to arc combustion, the action switch removes the fault, the safety of equipment and personnel is guaranteed, and the loss is reduced to the minimum.
The high-voltage bus of 110kV and above has some technical problems to be solved, such as: the bus protection is to improve the reliability and the action speed of the protection through voltage locking, the voltage quantity taken from a bus voltage transformer can often have the phenomenon of disconnection or short circuit tripping, and the bus protection losing the voltage can only cut off the bus fault by reducing the action speed and delaying; the high-voltage bus protection also has obvious defects in the current transformer saturation judgment aspect, and the performance is seriously influenced when the bus voltage is lost, so that protection misoperation is easily caused; the transformer substation of 500kV and above generally adopts a semi-main wiring form, a bus voltage transformer is not provided, bus protection cannot acquire bus voltage, and when a current transformer is disconnected, if the disconnection phase current of the current transformer is greater than a bus differential protection threshold, differential protection can be mistakenly operated; for the bus fault grounded through high resistance, not only the fault current is small, but also the fault voltage is reduced less, namely, voltage locking exists, and the protection cannot rapidly act to remove the fault.
Disclosure of Invention
In order to solve the technical problems, the invention constructs a novel bus protection principle and method by additionally arranging an arc light detector on a high-voltage bus and combining an arc light detection and judgment method with bus electric quantity protection, can ensure the rapidity of high-voltage protection action under the abnormal conditions of current transformer disconnection, voltage transformer disconnection and current transformer saturation, can accelerate the bus protection action under the high resistance or oscillation condition, and can be applied to the protection and judgment of a substation bus protection device, thereby shortening the fault removal time of the bus, improving the capability of coping with the abnormal conditions and improving the safety of a large-power-grid power system.
The invention specifically adopts the following technical scheme:
a method of high voltage bus protection incorporating arc light features, the method comprising the steps of:
step 1: an arc light detector is additionally arranged at the end of the bus, the current of each branch circuit connected with the bus is collected through a current transformer, the voltage of the bus is collected through a voltage transformer, and the arc light signal of the bus is collected through the arc light detector;
step 2: the bus differential protection component forms a ratio brake action characteristic by using each branch current on the bus, forms a voltage locking component by using bus voltage, and forms an arc distinguishing component by using detection data of an arc sensor;
and step 3: judging whether the bus differential protection element acts, entering a step 4 when the bus differential protection element acts, and otherwise entering a step 5;
and 4, step 4: judging whether the voltage locking element acts or not, and entering a step 9 when the voltage locking element acts; otherwise, entering step 7;
and 5: adjusting the braking coefficient of the bus differential protection element, judging whether the bus meets the action condition of the differential protection element after the braking coefficient is adjusted, if so, entering step 6, otherwise, ending the judgment, and returning to step 1;
step 6: adjusting the zero sequence voltage fixed value of the voltage locking element, judging whether the bus meets the action condition of the voltage locking element with improved sensitivity, if so, entering the step 7, otherwise, ending the judgment, and returning to the step 1;
step 7, judging whether the arc light judging element acts or not, and if so, entering step 9; otherwise, entering a step 8;
and 8: when the single criterion action time of the bus differential protection element reaches the set delay, the step 9 is carried out, otherwise, the judgment is finished and the step 1 is returned;
and step 9: and judging that the bus has a fault, and quickly tripping and removing the fault by the bus protection.
The invention further adopts the following preferred technical scheme:
in the step 1, a plurality of arc detectors are arranged on the bus to cooperatively detect and judge arc motions.
In the step 1, the arc detector adopts ultraviolet arc detection to detect the wavelength region of 230-280 nm.
In the step 3, the bus differential protection element is formed by a bus, and a ratio braking principle is adopted;
the criterion of the ratio braking type current differential protection action is as follows:
|i1+i2+…+in|≥I0 (1)
|i1+i2+…+in|≥K·(|i1|+|i2|+…+|in|) (2)
in the formula i1、i2、…、inIs branch current, K is braking coefficient, K is in the range of 0.2-0.9, I0The differential current threshold value is In the range of 0.05-20In, and In is the secondary rated current value of the bus current transformer.
In step 4, the voltage blocking element adopts a composite voltage blocking criterion, and the composite voltage blocking criterion comprises a low voltage, zero sequence voltage and negative sequence voltage criterion.
When used in a large earth system, the voltage blocking criteria for the voltage blocking element are as follows:
|Uph|≤UPzd (3)
|U2|≥U2zd (4)
|3U0|≥U0zd (5)
in the formula of UphIs a phase voltage, i.e., a voltage representing any one of the A-phase voltage, the B-phase voltage, and the C-phase voltage, UpzdAs a phase voltage setting value, U2Is a negative sequence voltage, U2zdIs negative sequence voltage setting value, 3U0Is zero sequence voltage, U0zdSetting a zero sequence voltage value;
the three criteria adopt OR logic, namely when any phase voltage is not more than the phase voltage setting value, or the negative sequence voltage is not less than the negative sequence voltage setting value, or the zero sequence voltage is not less than the zero sequence voltage setting value, the voltage locking element acts.
When the voltage blocking element is used in a small grounding current system, the zero sequence voltage criterion is cancelled, and the voltage blocking criterion of the voltage blocking element is as follows:
|Ul|≤Ulzd (6)
|U2|≥U2zd (7)
in the formula of UlU represents any one of AB phase line voltage, BC phase line voltage and CA phase line voltage for line voltagelzdAs a phase voltage setting value, U2Is a negative sequence voltage, U2zdSetting a negative sequence voltage;
the two criteria adopt OR logic, namely when any line voltage is not more than the line voltage setting value or the negative sequence voltage is not less than the negative sequence voltage setting value, the voltage locking element acts.
The value range of the phase voltage setting value is as follows: 0-Un, the negative sequence voltage setting value range: 0 to Un; the zero sequence voltage setting value range is as follows: 0-Un, wherein Un is the secondary rated voltage.
In step 5, the braking coefficient of the bus differential protection element is adjusted to 0.25.
In step 6, the zero sequence voltage fixed value of the voltage blocking element is set to 2V.
In step 7, when 2 or more of the arc detector measured values are greater than an arc operation threshold of the arc detector, the arc discrimination is valid, that is, the arc discriminating element is determined to be operated.
And the arc action threshold value of the arc detector is 5-20 klx.
In the step 8, the time for setting the judgment processing delay time for the voltage transformer disconnection no-voltage of the bus differential protection element is more than 20ms
The invention has the following beneficial technical effects:
the method utilizes the electric arc light sensor to sense the intensity of the electric arc light and combines the traditional electric quantity principle as a criterion. The high-voltage bus protection device has the advantages that the rapidity of protection actions of the high-voltage bus can be guaranteed under the abnormal conditions of protection of current transformer disconnection, voltage transformer disconnection and current transformer saturation, the protection actions can be accelerated under the high-resistance or oscillation conditions, the protection results can be applied to protection judgment of the substation bus protection device, the fault clearing time of the bus is shortened, and the safety of equipment and personnel is guaranteed.
Drawings
FIG. 1 is a flow chart of a high voltage bus bar protection method incorporating the arc feature of the present invention.
FIG. 2 is a schematic of voltage blocking logic.
Fig. 3 is a schematic diagram of the functional configuration of arc discrimination for dual bus protection according to one embodiment of the present invention.
Fig. 4 is a schematic view of an arc discrimination configuration for a half-open bus protection function according to another embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described in detail in the following with reference to the attached drawings 1-4 of the specification.
FIG. 1 is a flow chart of a high voltage bus bar protection method incorporating the arc feature of the present invention. According to fig. 1, the method for protecting a high-voltage bus bar by combining the arc characteristics specifically comprises the following steps:
step 1: install arc light detector additional at the generating line end, gather each branch road current that links to each other with the generating line through current transformer, gather busbar voltage through voltage transformer to and gather generating line arc light signal through arc light detector.
Because the bus equipment is generally hundreds of meters long and is not a closed space, a plurality of arc detectors are arranged on one bus to detect cooperatively according to the capacity of the arc detectors and the length of the bus, so that the arc action is judged.
The arc spectrum produced by the arc discharge contains 3 regions of ultraviolet, visible, and near infrared. The spectrum of the ultraviolet light is 230-400 nm, and the ultraviolet light in the wavelength region of 230-280nm is called a solar blind area. In order to detect arc discharge and reduce interference of sunlight, the light detected by the photoelectric sensor is processed by a corresponding filtering technology, and only ultraviolet light with the wavelength of below 280nm needs to be detected. In addition, considering outdoor installation factors, the arc light detector adopts ultraviolet arc light detection to detect a wavelength region of 230-280 nm.
Step 2: a bus differential protection element with a ratio brake action characteristic is formed by using each branch current on the bus, a voltage locking element is formed by using the bus voltage, and an arc distinguishing element is formed by using the detection data of the arc sensor.
And step 3: and (4) judging whether the bus differential protection element acts, and entering the step 4 when the bus differential protection element acts, or entering the step 5.
In step 3, the bus differential protection element is formed by a bus, and a ratio braking principle is adopted;
the criterion of the ratio braking type current differential protection is as follows:
|i1+i2+…+in|≥I0 (1)
|i1+i2+…+in|≥K·(|i1|+|i2|+…+|in|) (2)
in the formula i1、i2、…、inIs branch current, K is braking coefficient, K is in the range of 0.2-0.9, I0The differential current threshold value is In the range of 0.05-20In, and In is the secondary rated current value of the bus current transformer.
In step 3, the judgment of the disconnection current of the current transformer of the bus differential protection element comprises the following steps: the differential current increases, the current of a certain branch decreases, and the braking current decreases.
And 4, step 4: judging whether the voltage locking element acts or not, and entering a step 9 when the voltage locking element acts; otherwise step 7 is entered.
In step 4, the voltage blocking element adopts composite voltage blocking, which comprises low voltage, zero sequence voltage and negative sequence voltage criteria, and any one of the criteria meets the action condition, namely, the voltage blocking element of the section of the bus is opened.
Specifically, FIG. 2 is a schematic of voltage blocking logic.
When the voltage-locking circuit is used in a large grounding system, the low-voltage locking criterion adopts phase voltage, the overvoltage criterion adopts negative-sequence voltage and zero-sequence voltage, and the OR logic is adopted for judging, namely when the conditions of any one of the following formulas are met, the voltage-locking element is judged to act.
|Uph|≤UPzd (3)
|U2|≥U2zd (4)
|3U0|≥U0zd (5)
In the formula of UphIs a phase voltage of any one phase, namely, represents any one phase voltage of A phase voltage Ua, B phase voltage Ub and C phase voltage Uc, UpzdAs a phase voltage setting value, U2Is a negative sequence voltage, U2zdIs negative sequence voltage setting value, 3U0Is zero sequence voltage, U0zdAnd setting a zero sequence voltage value.
In a large grounding system, when any phase voltage is not greater than a phase voltage setting value, or a negative sequence voltage is not less than a negative sequence voltage setting value, or a zero sequence voltage is not less than a zero sequence voltage setting value, a voltage locking element acts.
When the system is in a small grounding current system, the low-voltage locking criterion adopts line voltage, the zero-sequence voltage criterion is cancelled, and OR logic is adopted for judgment, namely when the following conditions of any one type are met, the voltage locking element is judged to act.
|Ul|≤Ulzd (6)
|U2|≥U2zd (7)
In the formula of UlThe line voltage of any phase line represents AB phase line voltage Uab, BC phase line voltage Ubc and CA phase line voltage UcaAny one line voltage, UlzdTo line voltage setting value, U2Is a negative sequence voltage, U2zdIs a negative sequence voltage setting value and is used as a negative sequence voltage setting value,
in a small grounding current system, when any line voltage is not greater than a line voltage setting value or a negative sequence voltage is not less than the negative sequence voltage setting value, a voltage locking element acts.
The value range of the phase voltage setting value is as follows: 0-Un, negative sequence voltage setting value range: 0 to Un; zero-sequence voltage setting value range: 0 to Un, wherein Un is the secondary rated voltage, and the value of the secondary rated voltage is usually 57.7V or 100V.
And 5: and (3) improving the sensitivity of the bus differential protection element, judging whether the bus meets the action condition of the differential protection element with the improved sensitivity, if so, entering the step 6, otherwise, returning to the step 1.
Step 6: and (4) improving the sensitivity of the voltage locking element, judging whether the bus meets the action condition of the voltage locking element with the improved sensitivity, if so, entering the step 7, otherwise, returning to the step 1.
For a bus fault grounded through a high resistance, not only the fault current is small, but also the fault voltage is reduced less, and the protection cannot rapidly act to remove the fault, so that the sensitivity of a bus differential protection element and a voltage locking element needs to be improved. The sensitivity of the bus differential protection element and the voltage blocking element can be realized by adjusting fixed values, for example: the braking coefficient of the differential element can be adjusted to be 0.25, the zero sequence voltage fixed value of the voltage lock can be adjusted to be 2V, and the like.
Step 7, judging whether the arc light judging element acts or not, and if so, entering step 9; otherwise, go to step 8.
In step 7, when 2 or more of the arc detector measured values are greater than the arc operation threshold of the lake light detector, the arc discrimination is valid, that is, it is judged that the arc discriminating element is operating. Wherein the arc action threshold value of the arc detector is 5-20 klx.
And 8: and (4) when the single criterion action time of the bus differential protection element reaches the set delay, entering the step 9, otherwise, returning to the step 1.
In step 8, when the bus protection only adopts the differential element single criterion action, the bus differential protection element needs the voltage transformer disconnection non-voltage judgment processing delay to be more than 20ms, the differential current judgment redundancy is increased, and the protection misoperation is prevented.
And step 9: and judging that the bus has a fault, and quickly tripping and removing the fault by the bus protection.
Fig. 3 is a schematic diagram of a dual bus protection function configuration using arc light discrimination according to an embodiment of the present invention, where 2200, 2201, 2202, and 2203 are circuit breakers of a bus tie and bus branches 1, 2, and 3, respectively, each series of circuit breakers includes a current transformer required for protection, PT1 and PT2 are voltage transformers of a bus I and a bus II, respectively, and 1G and 2G are isolation switches of corresponding circuit breakers, respectively.
In this embodiment, the I bus protection method includes the following steps:
step 1: the method comprises the following steps that an I bus arc light detector is additionally arranged on an I bus, the current of each branch circuit connected with the I bus is collected through a current transformer, the voltage of the I bus is collected through an I bus voltage transformer PT1, and an I bus arc light signal is collected through the I bus arc light detector;
step 2: the bus differential protection element forms a ratio brake action characteristic by utilizing each branch current on the bus; forming an I bus voltage blocking element by using the I bus voltage; forming an I bus arc light distinguishing element by using detection data of the I bus arc light detector;
and step 3: judging whether the bus differential protection element acts, entering a step 4 when the bus differential protection element acts, and otherwise entering a step 5;
and 4, step 4: judging whether the I bus voltage locking element acts or not, and entering a step 9 when the I bus voltage locking element acts; otherwise, entering step 7;
and 5: adjusting the braking coefficient of the bus differential protection element, judging whether the bus meets the action condition of the differential protection element after the braking coefficient is adjusted, if so, entering step 6, otherwise, ending the judgment, and returning to step 1;
step 6: adjusting the zero sequence voltage fixed value of the I bus voltage locking element, judging whether the bus meets the action condition of the I bus voltage locking element after the sensitivity is improved, if so, entering the step 7, otherwise, finishing the judgment, and returning to the step 1;
and 7: judging whether the I bus arc light judging element acts or not, and if so, entering a step 9; otherwise, entering a step 8;
and 8: when the single criterion action time of the bus differential protection element reaches the set delay, the step 9 is carried out, otherwise, the judgment is finished, and the step 1 is returned;
and step 9: and judging that the bus has a fault, and quickly tripping and removing the fault by the bus protection.
Since the steps of the protection method for the II bus are consistent with those of the protection method for the I bus, the steps are not repeated. Fig. 4 is a schematic diagram of a half-wiring bus protection function configuration using arc discrimination according to another embodiment of the present invention, which includes 4 series of circuit breaker units, wherein the circuit breakers 5011, 5012, and 5013 are first strings, 5021, 5022, and 5023 are second strings, 5031, 5032, and 5033 are third strings, and 5041, 5042, and 5043 are fourth strings. Each series of circuit breaker units contains 3 sets of Current Transformers (CT) required for protection and no voltage transformers.
In this embodiment, the I bus protection method includes the following steps:
step 1: an I bus arc light detector is additionally arranged on the I bus, the current of each branch circuit connected with the I bus is collected through a current transformer, and an I bus arc light signal is collected through the I bus arc light detector;
step 2: the bus differential protection element forms a ratio brake action characteristic by utilizing each branch current on the bus; forming an I bus arc light distinguishing element by using detection data of the I bus arc light detector;
and step 3: judging whether the bus differential protection element acts, entering a step 4 when the bus differential protection element acts, and otherwise entering a step 5;
and 4, step 4: judging whether the voltage locking element acts or not, and entering a step 9 when the voltage locking element acts; otherwise step 7 is entered.
In this embodiment, since no voltage transformer is provided on the bus, the operation condition of the voltage blocking element is directly satisfied, and the process proceeds to step 9 directly.
And step 9: and judging that the bus has a fault, and quickly tripping and removing the fault by the bus protection.
Since the steps of the protection method for the II bus are consistent with those of the protection method for the I bus, the steps are not repeated.
The method utilizes the electric arc light sensor to sense the intensity of the electric arc light and combines the traditional electric quantity principle as a criterion. The high-voltage bus protection device can ensure the rapidity of high-voltage bus protection action under the abnormal conditions of CT (current transformer) disconnection protection, PT (potential transformer) disconnection protection and CT saturation protection, can accelerate the protection action under the high-resistance or oscillation condition, can be applied to the protection judgment of a substation bus protection device, shortens the fault removal time of a bus, and ensures the safety of equipment and personnel.
The above description provides the implementation of the invention by means of embodiments only. It will be apparent to those skilled in the art that the present invention is not limited to the details of the implementation provided above, but may be implemented in other embodiments without departing from the characteristics of the invention. Accordingly, the present embodiments are to be considered as illustrative and not restrictive. Thus the possibilities of implementing and using the invention are defined by the enclosed claims. Thus, various alternatives for implementing the invention, including equivalent embodiments, as determined by the claims, are also within the scope of the invention.
Claims (13)
1. A method of high voltage bus protection incorporating arc light features, the method comprising the steps of:
step 1: an arc light detector is additionally arranged at the end of the bus, the current of each branch circuit connected with the bus is collected through a current transformer, the voltage of the bus is collected through a voltage transformer, and the arc light signal of the bus is collected through the arc light detector;
step 2: the bus differential protection component forms a ratio brake action characteristic by using each branch current on the bus, forms a voltage locking component by using bus voltage, and forms an arc distinguishing component by using detection data of an arc sensor;
and step 3: judging whether the bus differential protection element acts, entering a step 4 when the bus differential protection element acts, and otherwise entering a step 5;
and 4, step 4: judging whether the voltage locking element acts or not, and entering a step 9 when the voltage locking element acts; otherwise, entering step 7;
and 5: adjusting the braking coefficient of the bus differential protection element, judging whether the bus meets the action condition of the differential protection element after the braking coefficient is adjusted, if so, entering step 6, otherwise, ending the judgment, and returning to step 1;
step 6: adjusting the zero sequence voltage fixed value of the voltage locking element, judging whether the bus meets the action condition of the voltage locking element with improved sensitivity, if so, entering the step 7, otherwise, ending the judgment, and returning to the step 1;
step 7, judging whether the arc light judging element acts or not, and if so, entering step 9; otherwise, entering a step 8;
and 8: when the single criterion action time of the bus differential protection element reaches the set delay, the step 9 is carried out, otherwise, the judgment is finished, and the step 1 is returned;
and step 9: and judging that the bus has a fault, and quickly tripping and removing the fault by the bus protection.
2. The method of claim 1 for protecting a high voltage busbar incorporating arc features, wherein:
in the step 1, a plurality of arc detectors are arranged on the bus to cooperatively detect and judge arc motions.
3. A method for high voltage busbar protection incorporating arc features according to claim 1 or 2, wherein:
in the step 1, the arc detector adopts ultraviolet arc detection to detect the wavelength region of 230-280 nm.
4. A method for high voltage busbar protection incorporating arc features according to claim 1 or 2, wherein:
in the step 3, the bus differential protection element is formed by a bus, and a ratio braking principle is adopted;
the criterion of the ratio braking type current differential protection action is as follows:
|i1+i2+…+in|≥I0 (1)
|i1+i2+…+in|≥K·(|i1|+|i2|+…+|in|) (2)
in the formula i1、i2、…、inIs branch current, K is braking coefficient, K is in the range of 0.2-0.9, I0The differential current threshold value is In the range of 0.05-20In, and In is the secondary rated current value of the bus current transformer.
5. A method for high voltage busbar protection incorporating arc features according to claim 1 or 2, wherein:
in step 4, the voltage blocking element adopts a composite voltage blocking criterion, and the composite voltage blocking criterion comprises a low voltage, zero sequence voltage and negative sequence voltage criterion.
6. The method of claim 5 in which the arc feature is incorporated into a high voltage busbar protection system, the method comprising:
when used in a large earth system, the voltage blocking criteria for the voltage blocking element are as follows:
|Uph|≤UPzd (3)
|U2|≥U2zd (4)
|3U0|≥U0zd (5)
in the formula of UphThe phase voltage is any one of the phase voltages of A phase voltage, B phase voltage and C phase voltage, UpzdAs a phase voltage setting value, U2Is a negative sequence voltage, U2zdIs negative sequence voltage setting value, 3U0Is zero sequence voltage, U0zdSetting for zero sequence voltageA value;
the three criteria adopt OR logic, namely when any phase voltage is not more than the phase voltage setting value, or the negative sequence voltage is not less than the negative sequence voltage setting value, or the zero sequence voltage is not less than the zero sequence voltage setting value, the voltage locking element acts.
7. The method of claim 5 in which the arc feature is incorporated into a high voltage busbar protection system, the method comprising:
when the voltage blocking element is used in a small grounding current system, the zero sequence voltage criterion is cancelled, and the voltage blocking criterion of the voltage blocking element is as follows:
|Ul|≤Ulzd (6)
|U2|≥U2zd (7)
in the formula of UlU represents any one of AB phase line voltage, BC phase line voltage and CA phase line voltage for line voltagelzdAs a phase voltage setting value, U2Is a negative sequence voltage, U2zdIs a negative sequence voltage setting value and is used as a negative sequence voltage setting value,
the two criteria adopt OR logic, namely when any line voltage is not more than the line voltage setting value or the negative sequence voltage is not less than the negative sequence voltage setting value, the voltage locking element acts.
8. The method of protecting a high-voltage busbar incorporating an arc feature of any one of claims 6 or 7, wherein:
the value range of the phase voltage setting value is as follows: 0-Un, negative sequence voltage setting value range: 0 to Un; zero-sequence voltage setting value range: 0-Un, wherein Un is the secondary rated voltage.
9. A method for high voltage busbar protection incorporating arc features according to claim 1 or 2, wherein:
in step 5, the braking coefficient of the bus differential protection element is adjusted to 0.25.
10. A method for high voltage busbar protection incorporating arc features according to claim 1 or 2, wherein:
in step 6, the zero sequence voltage fixed value of the voltage blocking element is set to 2V.
11. The method of claim 2 in combination with arc characterization for high voltage bus protection, wherein:
in step 7, when 2 or more of the arc detector measured values are greater than an arc operation threshold of the arc detector, the arc discrimination is valid, that is, the arc discriminating element is determined to be operated.
12. The method of protecting a high voltage busbar incorporating arc features of claim 11, wherein:
and the arc action threshold value of the arc detector is 5-20 klx.
13. A method for high voltage busbar protection incorporating arc features according to claim 1 or 2, wherein:
in the step 8, when the bus protection only adopts the differential element single criterion action, the set time of the voltage transformer disconnection non-voltage discrimination processing delay of the bus differential protection element is more than 20 ms.
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| US7852605B2 (en) * | 2008-06-20 | 2010-12-14 | Georgia-Pacific Consumer Products Lp | Arc-flash hazard protection system for three-phase electrical distribution system |
| US8792217B2 (en) * | 2010-09-15 | 2014-07-29 | Schweitzer Engineering Laboratories Inc | Systems and methods for protection of components in electrical power delivery systems |
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| CN207530537U (en) * | 2017-11-30 | 2018-06-22 | 镇江赛尔尼柯自动化有限公司 | Ship low pressure looped network distribution system |
| CN107887879A (en) * | 2018-02-07 | 2018-04-06 | 海南电网有限责任公司 | A kind of relay protection constant value on-line check system |
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