CN112653108B - Operation protection method for replacing transformer circuit breaker with bypass circuit breaker without shutdown protection - Google Patents
Operation protection method for replacing transformer circuit breaker with bypass circuit breaker without shutdown protection Download PDFInfo
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- CN112653108B CN112653108B CN202011538578.4A CN202011538578A CN112653108B CN 112653108 B CN112653108 B CN 112653108B CN 202011538578 A CN202011538578 A CN 202011538578A CN 112653108 B CN112653108 B CN 112653108B
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- 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention discloses a method for protecting the operation of a bypass circuit breaker replacing a transformer circuit breaker without shutdown protection, which is applied to a double-bus wiring line of a 220kV transformer substation of a power transmission and distribution network and solves the technical problems that in the prior art, differential protection is lost and 220kV backup protection is possibly lost in the operation process of replacing the transformer circuit breaker by the bypass circuit breaker. According to the invention, 1 more current branch circuit configuration scheme or 2 more current branch circuit configuration schemes are adopted for 220kV transformer protection of the 220kV transformer substation than conventional configuration, so that when a bypass breaker replaces a transformer breaker to operate, transformer differential protection and the side backup protection are not required to be stopped, equipment failure in the operation process is prevented, the transformer protection has complete differential protection and backup protection, particularly the transformer differential protection can quickly cut off a fault line, the safe and stable operation of a power grid is facilitated, and the power supply reliability of the power grid is improved.
Description
Technical Field
The invention relates to a method for protecting the operation of a bypass circuit breaker replacing a transformer circuit breaker without stopping power supply protection, belonging to the technical field of protection and control of a power transmission and distribution network.
Background
At present, a 220kV double-bus connection of a 220kV transformer substation is realized by connecting a secondary current loop of a 220kV side current transformer of a transformer and a secondary current loop of a bypass breaker into a differential protection loop of the transformer in a mode of switching the current loops externally. When the transformer differential protection circuit is in normal operation, only the secondary current circuit of the 220kV side current transformer of the transformer is connected, and the secondary current circuit of the current transformer of the bypass breaker is not connected with the transformer differential protection circuit. When the bypass circuit breaker replaces a 220kV side circuit breaker of a transformer to operate, the transformer differential protection circuit needs to be stopped firstly in the specific operation process, then the secondary current circuit of a 220kV side current transformer of the transformer is short-circuited to exit the transformer differential protection circuit, meanwhile, the tripping circuit of a 220kV side circuit breaker of a transformer protection tripping transformer is exited, then the secondary current circuit of the current transformer of the bypass circuit breaker is accessed to the transformer differential protection circuit, the tripping circuit is changed from the original 220kV side circuit breaker of the tripping transformer to the 220kV bypass circuit breaker, then the loop closing and opening operation of the two circuit breakers is carried out, and after the operation is finished, the transformer differential protection is restarted. Due to the integrated design of the main protection backup protection of the 220kV transformer, the differential protection is lost and the 220kV backup protection is possibly lost in the operation process; once a short-circuit fault occurs at a point K1 shown in fig. 2 in the operation process, the transformer protection cannot remove the fault, and the fault can be removed only by backup protection of other equipment in the power grid, so that firstly, the safe and stable operation of the power grid is influenced, and secondly, the related regulations of DL/T559 ' 220 kV-750 kV power grid relay protection device operation setting regulation ' and eighteen power grid major anti-accident measures ' of national power grid limited company are violated: "any electrical device is not allowed to operate unprotected".
Disclosure of Invention
The invention aims to provide a method for replacing a transformer circuit breaker with a bypass circuit breaker without shutdown protection to operate and protect, which is applied to a 220kV transformer substation double-bus wiring line of a power transmission and distribution network and solves the technical problems that in the prior art, differential protection is lost and 220kV backup protection is possibly lost in the operation process of replacing the transformer circuit breaker with the bypass circuit breaker.
The purpose of the invention is realized by the following technical scheme:
a method for replacing a transformer circuit breaker with a bypass circuit breaker without stopping protection for operation protection comprises the following steps:
1) the secondary current loop of the transformer differential protection requires a group of current loops to be configured for 220kV bypass interval current transformers, the current transformers on all sides of the transformer are in the same polarity according to the bus side, the secondary current of the current transformers is connected into the transformer protection according to the bus side, the secondary winding is required to be connected into a Y shape, the secondary a, b, c and N phase currents of the current transformers on all sides of the transformer with 220kV bypass intervals are respectively connected into the I phase current of all sides of the transformer protectionA、IB、IC、INA current loop;
the access method of the secondary current of the 220kV side current transformer of the transformer comprises the following steps:
the secondary windings of the current transformers 1LHa, 1LHb and 1LHc at the 220kV side of the transformer are connected into a Y shape, the secondary a, b, c and N phase currents of the current transformers at the 220kV side of the transformer are respectively connected in series with the current input pressing plates 1LPA, 1LPb, 1LPc and 1LPn at the 220kV side of the transformer at a phase a, b, c and N and then are connected to the I of the protection 1 side of the transformerA1、IB1、IC1、IN1A current loop;
when the 220kV circuit breaker of the transformer does not operate, 220kV side current transformers 1LHa, 1LHb, 1LHc secondary windings a, b, c of the transformer and 220kV side current input pressing plates 1LPA, 1LPb, 1LPc and 1LPn of the transformer with N-phase current are respectively disconnected and are in short circuit connection with the ground, and a 220kV side current loop of the transformer protection is withdrawn;
the access method of the secondary current of the interval current transformer of the 220kV bypass circuit breaker comprises the following steps:
the secondary windings of the interval current transformers 2LHa, 2LHb and 2LHc of the 220kV bypass circuit breaker are connected into a Y shape, the secondary a, b, c and N phase currents of the interval current transformers 2LHa, 2LHb and 2LHc of the 220kV bypass circuit breaker are respectively connected in series with switching pressing plates QPa, QPb, QPc and QPn of a phase, b, c and N phase and bypass current input pressing plates 2LPA, 2LPb, 2LPc and 2LPn and then are connected to the 2 nd side of the transformer protection, namely I of the 220kV bypassA2、IB2、IC2、IN2A current loop;
the switching pressure plates QPa, QPb, QPc and QPn can be switched to the No. 1 transformer protection current loop and can also be switched to the No. 2 transformer protection current loop; when the bypass circuit breaker does not replace a 220kV transformer circuit breaker to operate, secondary a, b, c and N phase currents of current transformers 2LHa, 2LHb and 2LHc are disconnected by switching pressing plates QPa, QPb, QPc and QPn and are in short circuit connection with the ground, and the No. 1 and No. 2 transformer protection current loops are withdrawn; meanwhile, the bypass current input pressing plates 2LPA, 2LPb, 2LPC and 2LPn are respectively disconnected and are in short circuit connection with the ground, and the current loop of the 2 nd side of the transformer protection, namely the 220kV bypass, is withdrawn;
the access method of the secondary current of the current transformer at the 110kV side of the transformer comprises the following steps:
the secondary windings of current transformers 3LHa, 3LHb and 3LHc at the 110kV side of the transformer are connected into a Y shape, and the secondary a, b, c and N phase currents are respectively connected to the 3 rd side of the transformer protection, namely the I side of the 110kV side of the transformerA3、IB3、IC3、IN3A current loop;
the access method of the secondary current of the current transformer at the 35kV side or the 10kV side of the transformer comprises the following steps:
the secondary windings of current transformers 4LHa, 4LHb and 4LHc at 35kV side or 10kV side of the transformer are connected into a Y shape, and the secondary a, b, c and N phase currents are respectively connected to the 4 th side of the transformer, namely the I side of 35kV side or 10kV side of the transformerA4、IB4、IC4、IN4A current loop;
2) the differential protection differential current calculation method of the transformer comprises the following steps:
the current on each side of the transformer differential protection plus 220kV bypass interval current participates in the calculation of differential current Ida、Idb、IdcCalculated as the formula:
Ida＝IdA1+k1IdA2+k2IdA3+k3IdA4 ⑴
Idb＝IdB1+k1IdB2+k2IdB3+k3IdB4 ⑵
Idc＝IdC1+k1IdC2+k2IdC3+k3IdC4 ⑶
wherein, IdA1、IdB1、IdC1The current transformer 1LH secondary current at the 220kV side of the transformer flows into the phase a, phase b and phase c currents at the 220kV side of the transformer differential protection after passing through phase shift; i isdA2、IdB2、IdC2The secondary current of the current transformer 2LH at the interval of the 220kV bypass is transmitted to the phase a, the phase b and the phase c at the interval of the differential protection bypass of the transformer after phase shifting; i isdA3、IdB3、IdC3The current transformer 3LH secondary current at the 110kV side of the transformer flows into the phase a, phase b and phase c currents at the 110kV side of the transformer differential protection after passing through phase shift; i isdA4、IdB4、IdC4The current transformer 4LH secondary current at the 35kV side or the 10kV side of the transformer flows into the phase a, the phase b and the phase c of the differential protection 110kV side of the transformer after passing through the phase shift phase; in the tables1、k2、k3Current balance coefficients of a bypass interval of transformer differential protection, a 110kV side transformer, a 35kV side transformer or a 10kV side transformer, respectively, and k is the same as that of a 220kV side current transformer 1LH of the transformer1Is 1;
with the secondary current I of the 220kV side of the transformerh1As a basis, Ih2Converting the rated current of the 220kV side of the transformer to the bypass interval secondary current, I, corresponding to the differential protection of the transformermConverting the rated current of the 110kV side of the transformer to the secondary current of the medium-voltage side corresponding to the differential protection of the transformer, ILConverting the current at the rated full capacity of the 35kV side or the 10kV side of the transformer to the secondary current at the low-voltage side corresponding to the differential protection of the transformer; u shapee1Rating the high-voltage side of the transformerVoltage, Ue2Rating the voltage, U, at the medium-voltage side of the transformere3Rating the voltage for the low-voltage side of the transformer; n is1Is the transformation ratio of a current transformer 1LH at the 220kV side of a transformer, n2Is the transformation ratio of 2LH of a 220kV bypass interval current transformer, n3Is the transformation ratio of a current transformer 3LH at the 110kV side of the transformer, n4The transformation ratio of a current transformer 4LH at the 35kV side or the 10kV side of the transformer; then there are:
3) The transformer backup protection current calculation method comprises the following steps:
the current of the high-voltage side of the transformer participating in the calculation of the backup protection current consists of the current of the 220kV side interval of the transformer and the current of the 220kV bypass interval, so the backup protection a, b and c of the transformer, the current of the N phase and the 3 times zero sequence current Ida.hb、Idb.hb、Idc.hb、3I0d.hbThe calculation is respectively as follows: current transformers 1LHa, 1LHb and 1LHc at 220kV side of transformer are respectively provided with phase current I of secondary windingsA1、IB1、IC1、3I01Current transformers 2LHa, 2LHb and 2LHc are separated from a 220kV bypass breaker to form secondary winding current I of each phaseA2、IB2、IC2、3I02The calculation was performed as follows:
Ida.hb＝IA1+k4IA2 ⑷
Idb.hb＝IB1+k4IB2 ⑸
Idc.hb＝IC1+k4IC2 ⑹
3I0d.hb＝3I01+k43I02 ⑺
formula 3I01、3I02Zero sequence current 3 times of the 220kV side and 220kV bypass interval of the transformer, wherein 3I01＝(IA1+IB1+IC1)，3I01＝(IA1+IB1+IC1) Formula four-midk4Bypass interval current balance coefficient, k, for transformer backup protection4＝n2/n1，n1Is the transformation ratio of a current transformer 1LH at the 220kV side of the transformer, n2Is the transformation ratio of 2LH of the 220kV bypass interval current transformer, if n1And n2Is the same, then k4Is 1;
4) the control method of the transformer protection tripping outlet loop comprises the following steps:
the 220kV transformer protection respectively provides 2 pairs of transformer protection outlet relay tripping contacts, 1 pair is used for a transformer protection tripping transformer 220kV side circuit breaker 1DL, the other 1 pair is used for a transformer protection tripping 220kV bypass circuit breaker 2DL, the 2 tripping loops are independent respectively, and respective direct current power supplies are used;
transformer protection trip transformer 220kV side circuit breaker 1DL trip outlet loop control:
the trip outlet loop of the 220kV side breaker 1DL of the transformer protection jump transformer is as follows: a transformer protection differential protection or backup protection total outlet relay CKJ1, CKJ1 is connected in series with a switching pressing plate 1 LP; when the 1LP is switched in, the trip is switched out, when the 1LP is switched on, the trip is quitted, and a direct-current power supply of a 220kV side breaker of the transformer is used;
and controlling a 2DL tripping outlet loop of a 220kV bypass circuit breaker under the protection of the transformer:
the transformer protection trip 220kV bypass breaker 2DL trip outlet loop is as follows: a transformer protection differential protection or backup protection total outlet relay CKJ2, CKJ2 is connected in series with a switching pressing plate 2 LP; when the 2LP is switched in, the trip is switched out, when the 2LP is switched on, the trip is switched out, and a direct current power supply of a 220kV bypass breaker is used.
The object of the invention can be further achieved by the following technical measures:
the bypass circuit breaker without outage protection replaces a transformer circuit breaker to operate the protection method, and the transformer backup protection comprises backup protection reflecting phase-to-phase faults and backup protection reflecting ground faults.
The operation protection method for replacing the transformer circuit breaker by the bypass circuit breaker without shutdown protection is suitable for a relay protection scheme that the 110kV bypass circuit breaker replaces the 110kV side bypass circuit breaker of the transformer, or a relay protection scheme that the 35kV bypass circuit breaker replaces the 35kV side bypass circuit breaker of the transformer.
The operation protection method of replacing the transformer circuit breaker with the bypass circuit breaker without shutdown protection is applied to the situation that the transformer protects the existing 220kV bypass circuit breaker to replace the 220kV side bypass circuit breaker of the transformer and the 110kV bypass circuit breaker to replace the 110kV side bypass circuit breaker of the transformer, 1 group of current loops are added to the transformer protection to provide the 110kV side bypass circuit breaker interval current, the 110kV side bypass circuit breaker interval current is added to the transformer differential protection to participate in differential current calculation, the 110kV side backup protection of the transformer is calculated by the 110kV side interval current of the transformer and the 110kV bypass interval current, 1 group of trip contacts jump the 110kV bypass circuit breaker, and the 110kV bypass circuit breaker direct-current power supply is used.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, a scheme of 1 or 2 more current branch circuits are configured for 220kV transformer protection of the 220kV transformer substation compared with the conventional scheme, so that when a bypass breaker replaces a transformer breaker to operate, transformer differential protection and backup protection on the side are not required to be stopped, equipment failure in the operation process is prevented, the transformer protection has complete differential protection and backup protection, especially the transformer differential protection can quickly cut off a fault line, the safe and stable operation of a power grid is facilitated, and the power supply reliability of the power grid is improved.
2. The technical scheme of the invention is simple and practical, easy to implement and stronger in adaptability, and the transformation ratios of the bypass breaker interval current transformer and the transformer breaker current transformer can be consistent or inconsistent.
3. The scheme of the invention can be popularized and applied to a relay protection method for protecting a 110kV side or low-voltage side bypass circuit breaker with a non-stop transformer of the transformer circuit breaker.
Drawings
FIG. 1 is a schematic diagram of the operation protection of the bypass circuit breaker of the present invention in place of a transformer circuit breaker;
fig. 2 is a primary main wiring diagram of a No. 1 or No. 2 transformer of a 220kV transformer substation.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The transmission and distribution network applied by the method is a 220kV transformer substation double-bus primary main wiring system network with a bypass. The primary main wiring of the 220kV system of the power transmission and distribution network comprises the following steps: 220kV I section bus and II section bus are connected with a 220kV breaker interval of No. 1 transformer or No. 2 transformer, a 220kV bypass switch interval, a 220kV I section bus and II section bus voltage mutual inductor (PT for short below), the 220kV breaker interval of the transformer is connected with a bus side isolating switch, a 220kV side breaker 1DL, a current mutual inductor 1LH and a transformer side isolating switch; a bus side isolating switch, a 220kV bypass switch 2DL, a current transformer 2LH and a bypass bus side isolating switch are arranged at intervals on the 220kV bypass switch, and the 220kV bypass breaker is connected with a 220kV bypass bus at intervals; the 220kV bypass bus is connected with the 220kV breaker interval transformer side of the No. 1 or No. 2 transformer through a No. 1 or No. 2 transformer 220kV bypass isolating switch; the No. 1 or No. 2 transformer 220kV circuit breaker is connected with the No. 1 or No. 2 transformer at intervals, and the No. 1 or No. 2 transformer is connected with the No. 1 or No. 2 transformer 110kV side circuit breaker interval and the No. 35kV side circuit breaker interval; the 110kV side circuit breaker interval and the 35kV side circuit breaker interval are respectively connected with a 110kV I section bus, a 110kV II section bus and a 35kV bus. 110kV I section buses, II section buses and 35kV buses are connected with 110kV I section buses, II section buses PT and 35kV PT; the 110kV side circuit breaker interval and the 35kV side circuit breaker interval are respectively provided with a bus side isolating switch, a 110kV side circuit breaker 3DL, a current transformer 3LH, a load side isolating switch, a bus side isolating switch, a 35kV side circuit breaker 4DL, a current transformer 3LH and a transformer side isolating switch.
The invention relates to an operation protection method for replacing a transformer breaker by a bypass breaker without shutdown protection, which has the following specific technical scheme:
1. protection scheme for connecting secondary current of current transformer on each side of transformer to transformer
1.1 Transformer differential protection secondary current loop configuration scheme
The transformer has only three-side or four-side current loop, but the differential protection of the transformer needs to be connected to each side I of the transformer protection according to the four-side or five-side current loop of the transformerA、IB、IC、INThe current loop, i.e. the secondary current loop requiring transformer protection requires a group of current loops to be configured for the use of 220kV bypass interval current transformers more than the originally configured 3 groups of current loops or 4 groups of current loops, so that the transformer differential protection is realized by the transformer differential protection of the original 3 groups of current loops or the transformer differential protection of the 4 groups of current loops, and the transformer differential protection of the 4 groups of current loops or the transformer differential protection of the 5 groups of current loops is further formed.
1.2 protection scheme for secondary current of transformer current transformer connected into transformer
The current transformers on each side of the transformer are all in the same polarity according to the bus side, the secondary current of the current transformers is connected into the transformer protection according to the bus side, the secondary winding is required to be connected into a Y shape, and the secondary a, b, c and N phase currents of the current transformers on each side of the transformer (including 220kV bypass intervals) are respectively connected into I phase currents on each side of the transformer protectionA、IB、IC、INAnd (4) a current loop, namely see fig. 1 and fig. 2.
Scheme for accessing secondary current of 220kV side current transformer of 1.2.1 transformer
The secondary windings of the current transformers 1LHa, 1LHb and 1LHc on the 220kV side of the transformer are connected into a Y shape, the secondary a, b, c and N phase currents of the current transformers are respectively connected in series with the 'current input pressing plates on the 220kV side of the transformer' 1LPA, 1LPb, 1LPc and 1LPn of a phase a, a phase b, a phase c and a phase N to be connected into a transformerTransformer protecting side 1 (220kV side of transformer) IA1、IB1、IC1、IN1A current loop;
when the transformer 220kV breaker does not operate, the current transformer 220kV side current input pressing plates 1LPA, 1LPb, 1LPc and 1LPn of the current transformers 1LHa, 1LHb, 1LHc secondary windings a, b and c and the N-phase current are respectively disconnected and short-circuited to be grounded (the current transformer sides on the left sides of 1LPA, 1LPb, 1LPc and 1LP are short-circuited and grounded), and a 220kV side current loop of the transformer protection is withdrawn;
secondary current access scheme of interval current transformer of 1.2.2220 kV bypass circuit breaker
The secondary windings of the interval current transformers 2LHa, 2LHb and 2LHc of the 220kV bypass circuit breaker are connected into a Y shape, the currents of the secondary a, b, c and N phases are respectively connected in series with switching pressing plates QPa, QPb, QPc and QPn of the a, b, c and N phases and a bypass current input pressing plate 2LPA, 2LPb, 2LPc and 2LPn which are connected into the I of the 2 nd side (220kV bypass) of transformer protectionA2、IB2、IC2、IN2A current loop;
the switching pressure plates QPa, QPb, QPc, QPn can be switched to the No. 1 transformer protection current loop, and can also be switched to the No. 2 transformer protection current loop. When the bypass circuit breaker does not replace a 220kV transformer circuit breaker to operate, secondary a, b, c and N-phase currents of the current transformers 2LHa, 2LHb and 2LHc are disconnected by the switching pressing plates QPa, QPb, QPc and QPn and are grounded in a short circuit mode (the left sides of the switching pressing plates QPa, QPb, QPc and QPn are grounded in a short circuit mode), and the No. 1 and No. 2 transformer protection current loops are exited; meanwhile, the bypass current input pressing plates 2LPa, 2LPb, 2LPc and 2LPn are respectively disconnected and grounded in a short circuit mode (the current transformer sides on the left sides of the 2LPa, 2LPb, 2LPc and 2LP are grounded in a short circuit mode), and a current loop on the 2 nd side (220kV bypass) of the transformer protection is withdrawn;
1.2.3 scheme for connecting secondary current of 110kV side current transformer of transformer
The secondary windings of current transformers 3LHa, 3LHb and 3LHc at the 110kV side of the transformer are connected into a Y shape, and the phases of secondary a, b, c and N are respectively connected to the I of the 3 rd side (the 110kV side of the transformer) of the protection of the transformerA3、IB3、IC3、IN3A current loop;
1.2.4 switching-in of secondary current of current transformer at 35kV side or 10kV side of transformer:
the secondary windings of current transformers 4LHa, 4LHb and 4LHc at 35kV side or 10kV side of the transformer are connected into a Y shape, and the secondary a, b, c and N phase currents are respectively connected to I of the 4 th side (35 kV side or 10kV side of the transformer) of the protection of the transformerA4、IB4、IC4、IN4A current loop;
2. differential current calculation principle scheme for differential protection of transformer
The current of each side of the transformer differential protection +220kV bypass interval current participates in the current of differential calculation (the original transformer differential protection of 3 groups of current circuits is changed into the transformer differential protection of 4 groups of current circuits as an example, the other conditions are similar), and the differential current Ida、Idb、IdcThe calculation is as follows:
Ida＝IdA1+k1IdA2+k2IdA3+k3IdA4 ⑴
Idb＝IdB1+k1IdB2+k2IdB3+k3IdB4 ⑵
Idc＝IdC1+k1IdC2+k2IdC3+k3IdC4 ⑶
the above-mentioned ways are implemented in a transformer protection software program, wherein IdA1、IdB1、IdC1The current transformer 1LH secondary current at the 220kV side of the transformer flows into the phase a, phase b and phase c currents at the 220kV side of the transformer differential protection after passing through phase shift; i isdA2、IdB2、IdC2The secondary current of the current transformer 2LH at the interval of the 220kV bypass is transmitted to the phase a, the phase b and the phase c at the interval of the differential protection bypass of the transformer after phase shifting; i isdA3、IdB3、IdC3The current transformer 3LH secondary current at the 110kV side of the transformer flows into the phase a, phase b and phase c currents at the 110kV side of the transformer differential protection after passing through phase shift; i isdA4、IdB4、IdC4Is a current transformer 4L on the 35kV side or the 10kV side of the transformerH secondary current flows into the phase a, b and c currents of the 110kV side of the transformer differential protection after passing through the phase shift phase; the phase shift of the current on each side is calculated by software protected by a transformer. In the tables1、k2、k3The current balance coefficients of the bypass interval of the transformer differential protection, the 110kV side of the transformer, the 35kV side of the transformer or the 10kV side of the transformer are respectively. If the transformation ratio of the 220kV side current transformer 1LH of the transformer is the same as that of the 220kV bypass spacing current transformer 2LH, k is1Is 1.
With the secondary current I on the 220kV side of the transformerh1As a basis, Ih2Converting the rated current of the 220kV side of the transformer to the bypass interval secondary current, I, corresponding to the differential protection of the transformermConverting the rated current of the 110kV side of the transformer to the secondary current of the medium-voltage side corresponding to the differential protection of the transformer, ILConverting the current at the rated full capacity of the 35kV side or the 10kV side of the transformer to the secondary current at the low-voltage side corresponding to the differential protection of the transformer; u shapee1Rating the voltage, U, for the high-side of the transformere2Rating the voltage, U, at the medium-voltage side of the transformere3Rating the voltage for the low-voltage side of the transformer; n is1Is the transformation ratio of a current transformer 1LH at the 220kV side of the transformer, n2Is the transformation ratio of 2LH of a 220kV bypass interval current transformer, n3Is the transformation ratio of a current transformer 3LH at the 110kV side of the transformer, n4The transformation ratio of a current transformer 4LH at the 35kV side or the 10kV side of the transformer; then there are:
3. Transformer backup protection current calculation principle scheme
The current of the high-voltage side of the transformer participating in the calculation of the backup protection current consists of the current of the 220kV side interval of the transformer and the current of the 220kV bypass interval, so the backup protection a, b and c of the transformer, the current of the N phase and the 3 times zero sequence current Ida.hb、Idb.hb、Idc.hb、3I0d.hbThe calculation is respectively as follows: current transformers 1LHa, 1LHb and 1LHc at 220kV side of transformer are respectively provided with phase current I of secondary windingsA1、IB1、IC1、3I01Current transformers 2LHa, 2LHb and 2LHc are separated from a 220kV bypass breaker to form secondary winding current I of each phaseA2、IB2、IC2、3I02The "sum current" calculation was performed:
Ida.hb＝IA1+k4IA2 ⑷
Idb.hb＝IB1+k4IB2 ⑸
Idc.hb＝IC1+k4IC2 ⑹
3I0d.hb＝3I01+k43I02 ⑺
formula four-way is realized in transformer protection software program, and formula 3I is peaceful01、3I02Zero sequence current 3 times of the 220kV side and 220kV bypass interval of the transformer, wherein 3I01＝(IA1+IB1+IC1)，3I01＝(IA1+IB1+IC1) And the software is realized in the transformer protection; formula fourth ~ midk4Bypass interval current balance coefficient, k, for transformer backup protection4＝n2/n1，n1Is the transformation ratio of a current transformer 1LH at the 220kV side of the transformer, n2The transformation ratio of the interval current transformer 2LH is bypassed for 220 kV. If n is1And n2Is the same, then k4Is 1.
4. And (3) controlling a transformer protection tripping outlet loop:
the 220kV transformer protection provides 2 pairs of tripping contacts of a transformer protection outlet relay respectively: 1 pair is used for transformer protection jump transformer 220kV side circuit breaker 1DL, and another 1 pair is used for transformer protection jump 220kV bypass circuit breaker 2DL, and these 2 trip circuits are independent respectively, use respective DC power supply.
4.1 transformer protection step transformer 220kV side circuit breaker 1DL trip outlet loop control
The trip outlet loop of the 220kV side breaker 1DL of the transformer protection jump transformer is as follows: a transformer protection differential protection or backup protection total outlet relay CKJ1, CKJ1 is connected in series with a switching pressing plate 1 LP; when the 1LP is switched in, the trip is switched out, when the 1LP is switched on, the direct current power supply of the 220kV side breaker of the transformer is used.
4.2 transformer protection trip 220kV bypass breaker 2DL trip outlet loop control
The transformer protection trip 220kV bypass breaker 2DL trip outlet loop is as follows: a transformer protection differential protection or backup protection total outlet relay CKJ2, CKJ2 is connected in series with a switching pressing plate 2 LP; when the 2LP is switched in, the trip is switched out, when the 2LP is switched on, the trip is switched out, and a direct current power supply of a 220kV bypass breaker is used.
5. The protection of the 220kV transformer is a main protection and backup protection integrated protection device; the transformer backup protection of the above 3 includes backup protection reflecting phase-to-phase faults: such as 220kV composite voltage overcurrent protection, overcurrent protection and the like with or without a directional element; backup protection reflecting ground fault: such as zero sequence current protection in 220kV direction, zero sequence current protection, etc.
6. The scheme is also suitable for a relay protection scheme that a 110kV bypass circuit breaker replaces a 110kV side bypass circuit breaker of a transformer, or a 35kV bypass circuit breaker replaces a 35kV side bypass circuit breaker of the transformer, only the current for accessing the protection of the transformer is changed into the current of the 110kV side of the transformer and the current of the 110kV side bypass interval, or the current of the 35kV side of the transformer and the current of the 35kV side bypass interval, and the tripping loops are respectively corresponding to a 110kV side circuit breaker of a jump transformer and a 110kV bypass circuit breaker.
If the transformer protection not only considers the 220kV bypass circuit breaker to replace the 220kV side bypass circuit breaker of the transformer, but also considers the 110kV bypass circuit breaker to replace the 110kV side bypass circuit breaker of the transformer, then on the basis of 1-4:
a. 1 group of current loops are added for the transformer protection to provide interval current for the 110kV side bypass circuit breaker, namely the original transformer protection of 3 groups of current loops is changed into the transformer protection of 5 groups of current loops;
b. the transformer differential protection is similar to the formula.
c. The 110kV side backup protection of the transformer is calculated by only the current at the 110kV side interval of the transformer, and is changed into the following steps: the sum current of the current at intervals of the 110kV side of the transformer and the current at intervals of the 110kV bypass is calculated and is similar to formulas four-six;
d. and the transformer protection is increased, 1 group of trip contacts trip a 110kV bypass breaker, and a 110kV bypass breaker direct-current power supply is used.
7. The scheme is also suitable for other relay protection methods of the primary main wiring bypass circuit breaker with the transformer circuit breaker and the transformer differential protection without stopping use.
8. The scheme is also suitable for the relay protection method of the non-stop transformer differential protection of the bypass circuit breaker with the transformer of other voltage classes.
An embodiment of the method of the present invention is given below (taking transformer No. 1 as an example, and the principle of transformer No. 2 is the same), as shown in fig. 1 and fig. 2:
1. the bypass breaker replaces the operation of No. 1 transformer 220kV breaker:
1.1 mode of operation
1 # transformer 220kV side circuit breaker 1DL, 110kV side circuit breaker 3DL, 35kV side or 10kV side circuit breaker 4DL operation, 220kV bypass circuit breaker 2DL operation, bypass bus electrification, 1 # transformer 220kV bypass isolator disconnection.
The protection tripping of the transformer comprises the following steps: tripping pressing plate 1LP of circuit breaker 1DL at 220kV side of the jump transformer is put into use; and opening and withdrawing the tripping pressure plate 2LP of the 220kV bypass circuit breaker 2 DL.
The '220 kV side current input pressing plates' of the transformer are input by pressing plates 1LPA, 1LPb, 1LPc and 1LPn, and secondary current loops of current transformers 1LHa, 1LHb and 1LHc at the 220kV side of the transformer are connected to a current loop at the 1 st side (220kV side of the transformer) of transformer protection;
the switching clamps QPa, QPb, QPc, QPn are shorted to ground and disconnected to exit on the current transformer side, and the "bypass current supply clamps" 2LPa, 2LPb, 2LPc, 2LPn are also shorted to ground and disconnected to exit on the current transformer side (i.e., the bypass interval current transformers 2LHa, 2LHb, 2LHc secondary current loop exits the No. 1 transformer protection current loop).
1.2 procedure
The method comprises the steps of changing the operation of a bypass breaker into hot standby;
the switching pressing plates QPa, QPb, QPc and QPn of the secondary circuits of the 220kV bypass interval current transformers 2LHa, 2LHb and 2LHc are switched into the switching pressing plates QPa, QPb, QPc and QPn from short-circuit grounding and disconnection, and the "bypass current switching pressing plates 2LPA, 2LPb, 2LPc and 2LPn are also switched into the switching pressing plates from disconnection and short-circuit grounding (namely the bypass interval current transformer secondary circuits are switched into No. 1 transformer protection current circuits).
Thirdly, the tripping pressing plate 2LP of the transformer protection tripping bypass circuit breaker 2DL is put into use;
step four, changing a No. 1 transformer bypass isolating switch from standby to operation;
fifthly, changing the hot standby of the bypass circuit breaker into operation (loop closing);
sixthly, opening a No. 1 transformer 220kV circuit breaker (ring opening);
the No. 1 transformer 220kV circuit breaker 1DL is switched from hot standby to cold standby;
and withdrawing (disconnecting) a current loop of the transformer protection 220kV side from a current transformer 1LHa, 1LPb, 1LPC and 1LPn of a secondary winding 'transformer 220kV side current input pressing plate' 1LPA, 1LPb, 1LPc and 1LPn of a transformer 220kV side current transformer 1LHa, 1LHb and 1LHc, and short-circuiting and grounding at the current transformer side (namely withdrawing the transformer protection current loop from the secondary current transformer 1LHa, 1LHb and 1LHc current loop of the transformer 220kV side);
the self-supporting self supporting;
in the operation process, the differential protection and the backup protection of the transformer are not stopped, so that the protection is not lost in the operation process, and the short-circuit fault of the transformer in the operation process can be quickly cut off.
Operation of No. 2.1 transformer 220kV circuit breaker for recovering normal operation
1.1 mode of operation
2DL of a 220kV bypass circuit breaker, 3DL of a 110kV side circuit breaker, 35kV side circuit breaker or 4DL of a 10kV side circuit breaker operate, 1 # transformer bypass isolating switch operates, a 220kV bypass bus is electrified, and 1 # transformer 220kV side circuit breaker 1DL is cold for standby.
The protection tripping of the transformer comprises the following steps: tripping a tripping pressing plate 2LP of a 220kV bypass circuit breaker 2DL to be put into; the trip pressing plate 1LP of the circuit breaker 1DL on the side of the trip transformer 220kV opens and exits.
The current transformers 1LHa, 1LHb and 1LHc secondary windings of the transformer 220kV side, namely a current input pressing plate 1LPA, 1LPb, 1LPc and 1LPn at the transformer 220kV side are disconnected and exit from a current loop at the transformer protection 220kV side, and are in short circuit grounding at the current transformer side (namely, the current of the secondary windings of the current transformers 1LHa, 1LHb and 1LHc at the transformer 220kV side exits from a No. 1 transformer protection current loop);
the switching pressure plates QPa, QPb, QPc, QPn are also switched on, and the "bypass current switching pressure plates" 2LPa, 2LPb, 2LPc, 2LPn are also switched on (i.e., the bypass interval current transformers 2LHa, 2LHb, 2LHc secondary loop are switched on the No. 1 transformer protection current loop).
1.2 procedure
The method comprises the steps of enabling 'transformer 220kV side current input pressing plates' 1LPA, 1LPb, 1LPc and 1LPn of current transformers 1LHa, 1LHb and 1LHc on the transformer 220kV side and secondary windings a, b, c and N to be grounded in a short circuit mode and disconnected to be withdrawn, and switching the current transformers into a current loop connected to the 1 st side (the transformer 220kV side) of transformer protection;
putting a tripping pressing plate 1LP of a breaker 1DL on a 220kV side of a transformer protection tripping transformer into use;
thirdly, the 220kV circuit breaker 1DL of the No. 1 transformer is changed from cold standby to operation (closed loop);
fourthly, the 220kV bypass breaker 2DL is turned from running to hot standby (ring opening);
changing the operation of the transformer bypass isolating switch No. 1 into standby (disconnection);
sixthly, switching pressure plates QPa, QPb, QPc and QPn of secondary circuits of bypass interval current transformers 2LHa, 2LHb and 2LHc and switching pressure plates QPa, QPb, QPc and bypass current input pressure plates 2LPa, 2LPb, 2LPc and 2LPn are respectively disconnected and are in short circuit grounding at the current transformer side (namely, the secondary current circuits of the bypass interval current transformers 2LHa, 2LHb and 2LHc exit from a No. 1 transformer protection current circuit);
the trip press plate 2LP of the transformer protection trip 220kV bypass breaker 1DL is taken out of operation.
And the 220kV bypass breaker is changed from hot standby to operation.
In the operation process, the differential protection and the backup protection of the transformer are not stopped, so that the protection is not lost in the operation process, and the short-circuit fault of the transformer in the operation process can be quickly cut off.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.
Claims (4)
1. A method for replacing a transformer circuit breaker with a bypass circuit breaker without shutdown protection for operation protection is characterized by comprising the following steps:
1) the secondary current loop of the transformer differential protection requires a group of current loops to be configured for 220kV bypass interval current transformers, the current transformers on all sides of the transformer are in the same polarity according to the bus side, the secondary current of the current transformers is connected into the transformer protection according to the bus side, the secondary winding is required to be connected into a Y shape, the secondary a, b, c and N phase currents of the current transformers on all sides of the transformer with 220kV bypass intervals are respectively connected into the I phase current of all sides of the transformer protectionA、IB、IC、INA current loop;
the access method of the secondary current of the 220kV side current transformer of the transformer comprises the following steps:
a 220kV side current transformer 1LHa of the transformer,Secondary windings of 1LHb and 1LHc are connected into a Y shape, secondary a, b, c and N phase currents of a current transformer at 220kV side of the transformer are respectively connected in series with a, b, c and N phase current input pressing plate 1LP of the transformer at 220kV side of the transformera、1LPb、1LPc、1LPNProtection of side 1 of rear-access transformerA1、IB1、IC1、IN1A current loop;
when the 220kV circuit breaker of the transformer does not operate, the 220kV side current input pressing plate 1LP of the transformer with the currents of the secondary windings a, b and c of the current transformers 1LHa, 1LHb and 1LHc on the 220kV side of the transformer and the N phasea、1LPb、1LPc、1LPNRespectively disconnecting and short-circuiting grounding, and exiting a 220kV side current loop of the transformer protection;
the access method of the secondary current of the interval current transformer of the 220kV bypass circuit breaker comprises the following steps:
the secondary windings of the interval current transformers 2LHa, 2LHb and 2LHc of the 220kV bypass circuit breaker are connected into a Y shape, and the secondary a, b, c and N phase currents of the interval current transformers of the 220kV bypass circuit breaker are respectively connected in series with a, b, c and N phase switching pressing plates QPa、QPb、QPc、QPNAnd bypass current input pressing plate 2LPa、2LPb、2LPc、2LPNI of back-connected transformer for protecting 2 nd side, namely 220kV bypassA2、IB2、IC2、IN2A current loop;
switch platen QPa、QPb、QPc、QPNThe switching can be performed to a No. 1 transformer protection current loop, and can also be performed to a No. 2 transformer protection current loop; when the bypass breaker does not replace a 220kV transformer breaker to operate, the currents of secondary a, b and c of current transformers 2LHa, 2LHb and 2LHc are switched by a switching pressure plate QPa、QPb、QPc、QPNDisconnecting and short-circuiting grounding, and exiting the No. 1 and No. 2 transformer protection current loops; while the bypass current is put into the pressing plate 2LPa、2LPb、2LPc、2LPNDisconnecting and short-circuiting grounding, and withdrawing from a current loop of the 2 nd side of the transformer protection, namely the 220kV bypass;
the access method of the secondary current of the current transformer at the 110kV side of the transformer comprises the following steps:
the secondary windings of current transformers 3LHa, 3LHb and 3LHc at the 110kV side of the transformer are connected into a Y shape, and the secondary a, b, c and N phase currents are respectively connected to the 3 rd side of the transformer protection, namely the I side of the 110kV side of the transformerA3、IB3、IC3、IN3A current loop;
the access method of the secondary current of the current transformer at the 35kV side or the 10kV side of the transformer comprises the following steps:
the secondary windings of current transformers 4LHa, 4LHb and 4LHc at 35kV side or 10kV side of the transformer are connected into Y shape, the secondary a, b, c and N phase currents are respectively connected to the 4 th side of the transformer protection, namely I side at 35kV side or 10kV side of the transformerA4、IB4、IC4、IN4A current loop;
2) the differential protection differential current calculation method of the transformer comprises the following steps:
the current on each side of the transformer differential protection plus 220kV bypass interval current participates in the calculation of differential current Ida、Idb、IdcCalculated as the formula:
Ida＝IdA1+k1IdA2+k2IdA3+k3IdA4 ⑴
Idb＝IdB1+k1IdB2+k2IdB3+k3IdB4 ⑵
Idc＝IdC1+k1IdC2+k2IdC3+k3IdC4 ⑶
wherein, IdA1、IdB1、IdC1The current transformer 1LH secondary current at the 220kV side of the transformer flows into the phase a, phase b and phase c currents at the 220kV side of the transformer differential protection after passing through phase shift; i isdA2、IdB2、IdC2The secondary current of the current transformer 2LH at the interval of the 220kV bypass is transmitted to the phase a, the phase b and the phase c at the interval of the differential protection bypass of the transformer after phase shifting; i isdA3、IdB3、IdC3The secondary current of the current transformer 3LH on the 110kV side of the transformer flows into the differential protection 110 of the transformer after passing through phase shift phaseThe currents of a, b and c at the kV side; i isdA4、IdB4、IdC4The current transformer 4LH secondary current at the 35kV side or the 10kV side of the transformer flows into the phase a, the phase b and the phase c of the differential protection 110kV side of the transformer after passing through the phase shift phase; in the tables1、k2、k3Current balance coefficients of a bypass interval of transformer differential protection, a 110kV side of transformer, a 35kV side of transformer or a 10kV side of transformer, if the transformation ratio of a current transformer 1LH at a 220kV side of transformer is the same as that of a current transformer 2LH at a 220kV bypass interval, k is1Is 1;
with the secondary current I of the 220kV side of the transformerh1As a reference, Ih2Converting the rated current of the 220kV side of the transformer to the bypass interval secondary current, I, corresponding to the differential protection of the transformermConverting the rated current of the 110kV side of the transformer to the secondary current of the medium-voltage side corresponding to the differential protection of the transformer, ILConverting the current at the rated full capacity of the 35kV side or the 10kV side of the transformer to the secondary current at the low-voltage side corresponding to the differential protection of the transformer; u shapee1Rating the voltage, U, for the high-side of the transformere2Rating the voltage, U, at the medium-voltage side of the transformere3Rating the voltage for the low-voltage side of the transformer; n is1Is the transformation ratio of a current transformer 1LH at the 220kV side of the transformer, n2Is the transformation ratio of 2LH of a 220kV bypass interval current transformer, n3Is the transformation ratio of a current transformer 3LH at the 110kV side of the transformer, n4The transformation ratio of a current transformer 4LH at the 35kV side or the 10kV side of the transformer; then there are:
3) The transformer backup protection current calculation method comprises the following steps:
the current of the high-voltage side of the transformer participating in the calculation of the backup protection current consists of the current of the 220kV side interval of the transformer and the current of the 220kV bypass interval, so the backup protection a, b and c of the transformer, the current of the N phase and the 3 times zero sequence current Ida.hb、Idb.hb、Idc.hb、3I0d.hbThe calculation is respectively as follows: current transformers 1LHa, 1LHb and 1LHc at 220kV side of transformer are respectively provided with phase current I of secondary windingsA1、IB1、IC1、3I01Current transformers 2LHa, 2LHb and 2LHc are separated from 220kV bypass circuit breakers to form secondary winding current I of each phaseA2、IB2、IC2、3I02The calculation was performed as follows:
Ida.hb＝IA1+k4IA2 ⑷
Idb.hb＝IB1+k4IB2 ⑸
Idc.hb＝IC1+k4IC2 ⑹
3I0d.hb＝3I01+k43I02 ⑺
3I in form of hobby01、3I02Zero sequence current 3 times of the 220kV side and 220kV bypass interval of the transformer, wherein 3I01＝(IA1+IB1+IC1)，3I02＝(IA2+IB2+IC2) Four-way intermediate k4Bypass interval current balance coefficient, k, for transformer backup protection4＝n2/n1，n1Is the transformation ratio of a current transformer 1LH at the 220kV side of the transformer, n2Is the transformation ratio of 2LH of the 220kV bypass interval current transformer, if n1And n2Is the same, then k4Is 1;
4) the control method of the transformer protection tripping outlet loop comprises the following steps:
the 220kV transformer protection respectively provides 2 pairs of trip contacts of a transformer protection outlet relay, wherein 1 pair is used for protecting a 220kV side circuit breaker 1DL of a jump transformer, the other 1 pair is used for protecting a 220kV bypass circuit breaker 2DL of the jump transformer, the 2 trip circuits are independent respectively, and respective direct current power supplies are used;
transformer protection trip transformer 220kV side circuit breaker 1DL trip outlet loop control:
the trip outlet loop of the 220kV side breaker 1DL of the transformer protection jump transformer is as follows: a transformer protection differential protection or backup protection total outlet relay CKJ1, CKJ1 is connected in series with a switching pressing plate 1 LP; when the 1LP is switched in, the trip is switched out, when the 1LP is switched on, the trip is quitted, and a direct-current power supply of a 220kV side breaker of the transformer is used;
and the transformer protection tripping 220kV bypass circuit breaker 2DL tripping outlet loop control:
the transformer protection trip 220kV bypass breaker 2DL trip outlet loop is as follows: a transformer protection differential protection or backup protection main outlet relay CKJ2, CKJ2 is connected in series with a switching pressing plate 2 LP; when the 2LP is switched in, the trip is switched out, when the 2LP is switched on, the trip is switched out, and a direct current power supply of a 220kV bypass breaker is used.
2. The method for protection against non-shutdown protection for operation of a bypass circuit breaker in place of a transformer circuit breaker according to claim 1, wherein the transformer backup protection includes a backup protection reflecting a phase-to-phase fault and a backup protection reflecting a ground fault.
3. The method for protecting the operation of a bypass circuit breaker without shutdown protection instead of a transformer circuit breaker according to claim 1, wherein the method is applied to a relay protection scheme in which a 110kV bypass circuit breaker replaces a 110kV side bypass circuit breaker of the transformer, or a relay protection scheme in which a 35kV bypass circuit breaker replaces a 35kV side bypass circuit breaker of the transformer.
4. The method for protecting the operation of a bypass circuit breaker without shutdown protection instead of a transformer circuit breaker according to claim 1, wherein when the method is applied to the situation that the transformer protection has both a 220kV bypass circuit breaker instead of a 220kV side bypass circuit breaker and a 110kV bypass circuit breaker instead of a 110kV side bypass circuit breaker, 1 set of current loops are added to the transformer protection to provide the 110kV side bypass circuit breaker with the interval current, the transformer differential protection has the interval current of the 110kV side bypass circuit breaker to participate in the differential current calculation, the 110kV side backup protection has the interval current of the 110kV side transformer and the interval current of the 110kV bypass circuit to participate in the backup protection current calculation, the transformer protection has 1 set of trip contacts to trip the 110kV bypass circuit breaker, and the 110kV bypass circuit breaker is used as the direct-current power supply.
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