CN214100839U - Protection switch for opening triangle of voltage transformer - Google Patents
Protection switch for opening triangle of voltage transformer Download PDFInfo
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- CN214100839U CN214100839U CN202120190159.XU CN202120190159U CN214100839U CN 214100839 U CN214100839 U CN 214100839U CN 202120190159 U CN202120190159 U CN 202120190159U CN 214100839 U CN214100839 U CN 214100839U
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- 238000009413 insulation Methods 0.000 description 3
- 230000002427 irreversible effect Effects 0.000 description 2
- 238000012806 monitoring device Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- 230000020169 heat generation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
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Abstract
A protection switch for an opening triangle of a voltage transformer relates to the technical field of power system safety. The utility model relates to a solve the play line side that current voltage transformer opening triangle protection was rolled up and all do not have the protection, lead to burning out and explosion scheduling problem of voltage transformer. A protection switch for voltage transformer opening triangle, include: the relay protection circuit comprises a first secondary switch, a second secondary switch, a third secondary switch and a relay protection circuit. A protection switch for an opening triangle of a voltage transformer and a wiring method thereof are characterized in that a secondary air switch is additionally arranged at a protection roll of the opening triangle of the voltage transformer to realize the protection of the voltage transformer. The open triangular secondary circuit is mainly applied to a voltage transformer in an electric power system.
Description
Technical Field
The utility model belongs to the technical field of electric power system safety, in particular to protection switch.
Background
The transformer substation is a power supply hub of a power system, and equipment in the transformer substation is mainly divided into primary equipment and secondary equipment. The primary equipment mainly refers to equipment directly participating in power generation, transmission, transformation and distribution, such as a transformer, a circuit breaker, a voltage transformer, an isolating switch and the like; the secondary equipment is equipment for monitoring, controlling, regulating and protecting the working condition of the primary equipment to provide working conditions or production command signals for operators. The voltage transformer is a device for converting a high voltage (primary voltage) of a transformer substation into a low voltage (secondary voltage), and the converted secondary voltage provides the most basic data for the secondary devices of the transformer substation. The voltage transformer consists of a primary winding and a secondary winding, the primary winding is connected with a high-voltage loop, the rated voltage of the secondary winding is 57V phase voltage, the secondary winding is connected with secondary equipment through a secondary air switch, and the key of the normal operation of the secondary equipment lies in whether the secondary voltage after voltage mutual inductance conversion is normal or not. Voltage transformers are therefore of great importance in electrical power systems. The direct cause of accidents such as burning and explosion of the voltage transformer is caused by heat generation caused by internal overcurrent, and the overcurrent has two main expression forms: the first is that due to resonance or other reasons, overvoltage and overcurrent borne by the voltage transformer are small in amplitude but long in time, and a large amount of electric energy acts on the voltage transformer and is converted into heat energy, so that the situation that the cable which is led out from the secondary line of the voltage transformer generates heat for a long time is often seen in intermittent short circuit caused by internal water inflow or severe damp. When the heat is accumulated to a certain degree, a large amount of insulating paper and insulating medium in the voltage transformer are heated and vaporized, the volume is rapidly expanded, the internal space of the dry voltage transformer is limited, and the dry voltage transformer explodes when the pressure is increased to a certain degree. The second is an overcurrent caused by a momentary high-magnitude overvoltage. An overvoltage of a certain magnitude causes a turn-to-turn short circuit to cause an overcurrent. The overcurrent generally has a large amplitude, and an internal short circuit is generally caused by the misconnection of a secondary side cable or external force and other factors, so that an insulating medium in the voltage transformer is rapidly vaporized, and explosion caused by high-amplitude overvoltage is caused. Although events such as burning damage and explosion of various voltage transformers often occur and are always concerned and researched by people for a long time, people pay little attention to the operation safety of the outlet side of the open triangular protection coil of the voltage transformer, and once a short circuit condition occurs in the side cable, the side cable directly causes irreversible harm to the voltage transformer and threatens the operation safety, personal safety and even the power grid safety.
The reasons of accidents such as burning and explosion of the voltage transformer are caused by internal faults or secondary short circuits, the outgoing side of the open triangular protection roll of the conventional voltage transformer is not protected, when a transformer substation is initially operated and normally operated later, short circuits of secondary cables of the voltage transformer can be caused due to cable breakdown, damp of cable inlet water, artificial misconnection and the like, and the short circuits of the secondary side of the open triangular secondary side of the voltage transformer directly threaten the operation safety and equipment safety of the voltage transformer because the open triangular secondary side of the voltage transformer is not provided with a protection switch. Because the secondary sides of the protection turn and the metering turn of the voltage transformer are provided with fuse fuses or are opened in an empty mode, internal faults of the voltage transformer cannot be caused due to short circuits, but due to the problems of design or installation cost and the like of the conventional voltage transformer, secondary wiring never has any protection in an open triangular protection roll, once faults such as the short circuits and the like come from secondary outgoing lines of the open triangular protection roll of the voltage transformer, internal burning loss of the voltage transformer can be directly caused, equipment damage and even explosion are caused, and personal safety and power grid safety of a crisis are caused. Therefore, an idle switch is additionally arranged at the outlet of the opening triangular protection coil of the voltage transformer to limit the overcurrent of the voltage transformer, and can send a signal in time to inform an operator of handling the fault in time, so that the defects are eliminated, and the operation safety of the voltage transformer and other equipment is ensured.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve the play line side that current voltage transformer opening triangle protection was rolled up and all do not have the protection, lead to burning out and explosion scheduling problem of voltage transformer, provide a protection switch who is used for voltage transformer opening triangle now.
The utility model provides a protection switch for voltage transformer opening triangle, include: the relay protection circuit comprises a first secondary switch, a second secondary switch, a third secondary switch and a relay protection circuit, wherein the first secondary switch, the second secondary switch and the third secondary switch are respectively provided with a first contact, a second contact, a third contact, a fourth contact, a first auxiliary contact and a second auxiliary contact; the first contact, the fourth contact and the second auxiliary contact are same-end contacts, the second contact, the third contact and the first auxiliary contact are same-end contacts, the first contact and the second contact are different-end contacts, the third contact and the fourth contact are different-end contacts, and the first auxiliary contact and the second auxiliary contact are different-end contacts; the first contact of the first secondary switch is a connection end of an open triangular outgoing line end da of the voltage transformer, the second contact and the third contact of the first secondary switch are respectively two connection ends of an open triangular coil of the A-phase voltage transformer, the fourth contact of the first secondary switch is connected with the first contact of the second secondary switch, the first auxiliary contact of the first secondary switch is an QAa1 connection end of the relay protection circuit, the second auxiliary contact of the first secondary switch is a QAa2 connection end of the relay protection circuit, the second contact and the third contact of the second secondary switch are respectively two connection ends of an open triangular coil of the B-phase voltage transformer, the fourth contact of the second secondary switch is connected with the first contact of the third secondary switch, the first auxiliary contact of the second secondary switch is a QAb1 connection end of the relay protection circuit, and the second auxiliary contact of the second secondary switch is a QAb2 connection end of the relay protection circuit, the second contact and the third contact of the third secondary switch are respectively two connecting ends of an open triangular coil of the C-phase voltage transformer, the fourth contact of the third secondary switch is a connecting end of an open triangular outgoing line end dn, the first auxiliary contact of the third secondary switch is an QAc1 connecting end of the relay protection circuit, and the second auxiliary contact of the third secondary switch is a QAc2 connecting end of the relay protection circuit.
Preferably, the operating currents of the first secondary switch, the second secondary switch and the third secondary switch are all 2A.
A protection switch for voltage transformer opening triangle be through rolling up the protection of department at voltage transformer opening triangle and install secondary air switch additional and realize the protection to voltage transformer. Because voltage transformer is far away to the protection screen distance, cable routing is longer, insulating fault takes place easily, use the utility model discloses can accurately avoid this type of trouble after, can guarantee the operation safety of voltage transformer opening triangle protection roll-out line side, prevent to roll up the problem that short circuit fault in the cable caused irreversible harm to voltage transformer by opening triangle protection, how to ensure the operation safety of voltage transformer opening triangle protection roll-up is the important topic to voltage transformer protection in the electric power system equally, consequently need not to design one kind and install a set of air switch additional in the secondary circuit of voltage transformer opening triangle protection roll-up, adopt neotype wiring protection method in order to guarantee voltage transformer's operation safety, prevent that voltage transformer from causing holistic scrapping because the scaling loss of single coil.
Drawings
FIG. 1 is a wiring flow diagram of a protection switch for an open triangle of a voltage transformer;
FIG. 2 is a wiring circuit diagram of a protection switch for an open triangle of a voltage transformer;
FIG. 3 is a schematic structural diagram of a protection switch for an open triangle of a voltage transformer;
FIG. 4 is a schematic diagram of an operation path of a protection switch for an open triangle of a voltage transformer;
FIG. 5 is a schematic diagram of a relay protection circuit;
FIG. 6 is a schematic diagram of voltage transformer primary side connection, secondary connection of a voltage transformer protection coil metering coil, and connection of a voltage transformer open delta protection coil;
fig. 7 is a schematic diagram of an open delta connection of a conventional voltage transformer.
Detailed Description
The first embodiment is as follows: specifically, the present embodiment is described with reference to fig. 1 to 7, and the protection switch for an open triangle of a voltage transformer according to the present embodiment includes: the relay protection circuit comprises a first secondary switch 1, a second secondary switch 2, a third secondary switch 3 and a relay protection circuit, wherein the first secondary switch 1, the second secondary switch 2 and the third secondary switch 3 are respectively provided with a first contact 4, a second contact 5, a third contact 6, a fourth contact 7, a first auxiliary contact 8 and a second auxiliary contact 9; the first contact 4, the fourth contact 7 and the second auxiliary contact 9 are same-end contacts, the second contact 5, the third contact 6 and the first auxiliary contact 8 are same-end contacts, the first contact 4 and the second contact 5 are different-end contacts, the third contact 6 and the fourth contact 7 are different-end contacts, and the first auxiliary contact 8 and the second auxiliary contact 9 are different-end contacts; the first contact 4 of the first secondary switch 1 is a connection end of an open triangular outgoing line end da of a voltage transformer, the second contact 5 and the third contact 6 of the first secondary switch 1 are respectively two connection ends of an open triangular coil of an A-phase voltage transformer, the fourth contact 7 of the first secondary switch 1 is connected with the first contact 4 of the second secondary switch 2, the first auxiliary contact 8 of the first secondary switch 1 is an QAa1 connection end of a relay protection circuit, the second auxiliary contact 9 of the first secondary switch 1 is a QAa2 connection end of the relay protection circuit, the second contact 5 and the third contact 6 of the second secondary switch 2 are respectively two connection ends of an open triangular coil of a B-phase voltage transformer, the fourth contact 7 of the second secondary switch 2 is connected with the first contact 4 of the third secondary switch 3, and the first auxiliary contact 8 of the second secondary switch 2 is a QAb1 connection end of the relay protection circuit, the second auxiliary contact 9 of the second secondary switch 2 is a QAb2 connection end of the relay protection circuit, the second contact 5 and the third contact 6 of the third secondary switch 3 are two connection ends of an open delta coil of the C-phase voltage transformer, respectively, the fourth contact 7 of the third secondary switch 3 is an open delta outlet end dn connection end, the first auxiliary contact 8 of the third secondary switch 3 is a QAc1 connection end of the relay protection circuit, and the second auxiliary contact 9 of the third secondary switch 3 is a QAc2 connection end of the relay protection circuit.
In this embodiment, the voltage transformer is arranged in a split-phase manner, and one single-phase transformer is provided with three turns of coils, except a primary side high-voltage coil, which are secondary coils: the insulation monitoring of the protection turn coil, the metering turn coil and the open triangle is carried out, in order to avoid the short circuit phenomenon of the coil to the maximum extent, a special linkage open and open signal is arranged at each phase outlet of the open triangle, the connection mode is still connected into the open triangle, the outlet ends are da and dn, and QAa1, QAb1, QAc1, QAc2, QAb2 and QAa2 are added.
A wiring method for triangular protection switch of voltage transformer opening does: the first contact 4 of the first secondary switch 1 is connected with the open triangular wire outlet da, the second contact 5 of the first secondary switch 1 is connected with one end of the open triangular coil of the phase voltage transformer A, the third contact 6 of the first secondary switch 1 is connected with the other end of the open triangular coil of the phase voltage transformer A, the fourth contact 7 of the first secondary switch 1 is connected with the first contact 4 of the second secondary switch 2, the first auxiliary contact 8 of the first secondary switch 1 is connected with the QAa1 end of the relay protection circuit, the second auxiliary contact 9 of the first secondary switch 1 is connected with the QAa2 end of the relay protection circuit, the second contact 5 of the second secondary switch 2 is connected with one end of the open triangular coil of the phase voltage transformer B, the third contact 6 of the second secondary switch 2 is connected with the other end of the open triangular coil of the phase voltage transformer B, the fourth contact 7 of the second secondary switch 2 is connected with the first contact 4 of the third secondary switch 3, the first auxiliary contact 8 of the second secondary switch 2 is connected with the QAb1 end of the relay protection circuit, the second auxiliary contact 9 of the second secondary switch 2 is connected with the QAb2 end of the relay protection circuit, the second contact 5 of the third secondary switch 3 is connected with one end of the open delta coil of the C-phase voltage transformer, the third contact 6 of the third secondary switch 3 is connected with the other end of the open delta coil of the C-phase voltage transformer, the fourth contact 7 of the third secondary switch 3 is connected with the open delta outgoing line end dn, the first auxiliary contact 8 of the third secondary switch 3 is connected with the QAc1 end of the relay protection circuit, and the second auxiliary contact 9 of the third secondary switch 3 is connected with the QAc2 end of the relay protection circuit.
A secondary switch is arranged on the lower side of the open triangular coil, when a short-circuit fault occurs, the short-circuit current is monitored and cut off in time, the turn of coil is protected from being burnt due to overcurrent, vicious operation accidents such as burning loss or explosion of a voltage transformer are prevented, and meanwhile, when a certain phase of open trip occurs, a signal sending switch linked with the open trip is directly triggered to close an auxiliary contact, a signal is sent to a relay protection device and then sent to a background, so that an operator on duty or an operator can find the fault and process the fault in time.
When the insulation monitoring device normally operates, the open triangular outgoing line terminal da and the open triangular outgoing line terminal dn can still reflect the grounding condition to the insulation monitoring device. Wherein QAa1, QAb1, QAc1 are connected to one point, QAc2, QAb2, QAa2 are connected to relay protection circuit, signal is sent out immediately when two points are connected, and person on duty or operator confirms on site that the linkage air-break tripping of the voltage transformer.
The second embodiment is as follows: in this embodiment, the protection switch for the open delta of the voltage transformer according to the first embodiment is further described, and in this embodiment, the operating currents of the first secondary switch, the second secondary switch and the third secondary switch are all 2A.
In the present embodiment, as shown in fig. 2, since the primary fuse of the voltage transformer cannot reflect and protect the secondary device in time (for example, two points of the cable from the terminal box of the a-phase open-delta voltage transformer to the protection screen are broken down to form a short circuit, the a-phase open-delta voltage transformer is short-circuited, and the short-circuit current is enough to burn the voltage transformer even if 50A is used), if the cable from the terminal box of the voltage transformer to the protection screen is short-circuited, the rated current is inevitably changed into a short-circuit current, since the current is 2A, the switch can be operated reliably when the current is greater than 2A, when the short-circuit occurs in the cable from the terminal box of the voltage transformer to the protection screen, the short-circuit current can trip QAa, QAb or QAc, and protect the main body of the voltage transformer and the cable after the trip, and the junction of QAa1, QAb1 and QAc1 and QAc2, QAb2, and 3983 are connected by the signaling switch, QAa2, the connection point is turned on to send a message to inform the background, and then the on-duty personnel or the operator goes to the site to carry out the accident investigation and treatment.
Claims (2)
1. A protection switch for an open delta of a voltage transformer, comprising: the relay protection circuit comprises a first secondary switch (1), a second secondary switch (2), a third secondary switch (3) and a relay protection circuit, wherein the first secondary switch (1), the second secondary switch (2) and the third secondary switch (3) are respectively provided with a first contact (4), a second contact (5), a third contact (6), a fourth contact (7), a first auxiliary contact (8) and a second auxiliary contact (9);
the first contact (4), the fourth contact (7) and the second auxiliary contact (9) are homonymous contacts, the second contact (5), the third contact (6) and the first auxiliary contact (8) are homonymous contacts, the first contact (4) and the second contact (5) are heteronymous contacts, the third contact (6) and the fourth contact (7) are heteronymous contacts, and the first auxiliary contact (8) and the second auxiliary contact (9) are heteronymous contacts;
a first contact (4) of a first secondary switch (1) is a connection end of an open triangular outgoing line end da of a voltage transformer, a second contact (5) and a third contact (6) of the first secondary switch (1) are respectively two connection ends of an open triangular coil of an A-phase voltage transformer, a fourth contact (7) of the first secondary switch (1) is connected with a first contact (4) of a second secondary switch (2), a first auxiliary contact (8) of the first secondary switch (1) is an QAa1 connection end of a relay protection circuit, a second auxiliary contact (9) of the first secondary switch (1) is a QAa2 connection end of the relay protection circuit, a second contact (5) and a third contact (6) of a second secondary switch (2) are respectively two connection ends of an open triangular coil of a B-phase voltage transformer, and a fourth contact (7) of the second secondary switch (2) is connected with a first contact (4) of a third secondary switch (3), a first auxiliary contact (8) of a second secondary switch (2) is a QAb1 connecting end of a relay protection circuit, a second auxiliary contact (9) of the second secondary switch (2) is a QAb2 connecting end of the relay protection circuit, a second contact (5) and a third contact (6) of a third secondary switch (3) are respectively two connecting ends of an open triangular coil of a C-phase voltage transformer, a fourth contact (7) of the third secondary switch (3) is an open triangular outgoing line end dn connecting end, a first auxiliary contact (8) of the third secondary switch (3) is a QAc1 connecting end of the relay protection circuit, and a second auxiliary contact (9) of the third secondary switch (3) is a QAc2 connecting end of the relay protection circuit.
2. The protection switch for the open delta of the voltage transformer according to claim 1, characterized in that the action currents of the first secondary switch (1), the second secondary switch (2) and the third secondary switch (3) are all 2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120190159.XU CN214100839U (en) | 2021-01-21 | 2021-01-21 | Protection switch for opening triangle of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120190159.XU CN214100839U (en) | 2021-01-21 | 2021-01-21 | Protection switch for opening triangle of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214100839U true CN214100839U (en) | 2021-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120190159.XU Active CN214100839U (en) | 2021-01-21 | 2021-01-21 | Protection switch for opening triangle of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214100839U (en) |
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2021
- 2021-01-21 CN CN202120190159.XU patent/CN214100839U/en active Active
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