RU105784U1 - RELAY PROTECTION OF A FOCUSED OBJECT FROM SHORT CLOSES - Google Patents

Abstract

 1. The relay protection device of a concentrated object from short circuits, which at the input contains the first measuring organs and operating circuits of the device with a time delay, additionally contains measuring organs at the output of the object and operating circuits of the device without a time delay. ! 2. The relay protection device according to claim 1, characterized in that in the operational circuits of the device without delaying the time of the object with several outputs, the measuring organs at the outputs of the object are connected in series.

Description

The invention relates to electrical engineering, namely to relay protection of generators, transformers, autotransformers, current-limiting reactors and other concentrated objects from short circuits.

A device for overcurrent protection with starting the voltage of the generator, containing current selective organs in the form of current relays, voltage measuring organs in the form of a voltage relay, a time delay element in the form of a time relay, an organ for turning off the generator circuit breaker and operational circuits connecting them according to a logical circuit .

The device is included in the current transformers of the generator zero terminals and voltage transformers on the generator terminals (see Guidelines for relay protection "Generator Protection", issue 1, SEI, M-L, 1961, Fig. 5.). The device operates with a time delay.

The disadvantage of this device is that short circuits in the generator are disabled with a time delay.

A device for overcurrent protection with voltage start-up, a transformer containing current selective organs in the form of current relays, voltage measuring organs in the form of a voltage relay, a time delay device in the form of a time relay, a transformer circuit breaker trip organ and operational circuits connecting them according to a logical scheme. The device is included in current transformers at the input of the supplying higher side of the transformer, voltage transformers of the lower side of the transformer (single or split into parts) (see Guidelines for relay protection "Relay protection of step-down transformers and autotransformers 110-500 kV", Circuits, issue 13A , M., energoatomizdat, 1985, Fig. 1-1). The device operates with a time delay.

The disadvantage of this device is that short circuits in the transformer are disconnected with a time delay of higher and medium voltage, a time delay organ, an autotransformer circuit breaker trip organ and operational circuits connecting them according to a logic diagram (see NPP EKRA, relay cabinet protection of 110-220 kV autotransformers and automatic control of circuit breakers of the ШЭ 2607.071 type, operation manual. ECRA 656453.028 RE., Cheboksary). The device operates with a time delay.

The disadvantage of this device is that short circuits in the autotransformer are disabled with a time delay.

A device for overcurrent protection of a current-limiting connection reactor is known, which contains current selective elements in the form of current relays, a time delay device in the form of a time relay, an disconnect switch disconnect organ, and operational circuits connecting them according to a logic circuit ((see. Relay guidelines protection "Relay protection of step-down transformers and autotransformers 110-500 kV", Circuits, issue 13A, M., energoatomizdat, 1985, Fig. 3-1. Schematic diagram of relay protection of autotransformer 500/220/10 kV with a capacity of 3 · 167 and 3 · 267 MV · A, in terms of reactor protection).

The device is included in current transformers at the inlet of the reactor. The device operates with a time delay.

The disadvantage of this device is that short circuits in the reactor are disabled with a time delay.

The objective of the invention is the creation of a relay protection device with speed when short circuits at the facility.

The specified technical result is achieved by the fact that the device contains the first measuring organs included at the input of the protected object, their operational circuits with time delay connected in accordance with the well-known logical circuit, and additionally the second measuring bodies included at the output of the protected object, and the circuit of the device without time excerpts. This allows you to improve the performance of the device during short circuits on the protected object.

The zone of operation of the device without a time delay is limited to the area located between the current transformers at the input and current transformers at the output of the object. The sections of the external network are the time zone of the device. The operation of the device without time delay in case of damage in the zone is reserved by the operation of the device with time delay.

The invention is illustrated by examples of implementation of the protection device of the generator, transformer, autotransformer, reactor and drawings, where:

figure 1 shows a device for the relay protection of a two-winding transformer against short circuits, a circuit diagram;

figure 2 shows the device of relay protection of the generator from short circuits, circuit diagram;

figure 3 shows the relay protection device of the autotransformer against short circuits, a circuit diagram;

figure 4 shows the relay protection device of a current-limiting reactor from short circuits, a circuit diagram;

figure 5 shows a device for the relay protection of a three-winding transformer against short circuits, a circuit diagram;

figure 6 shows the relay protection device at the input of the object with two and a large number of inputs:

sheet 1. Schematic diagram of alternating current and voltage circuits;

sheet 2, sheet 3. Schematic diagram of operational circuits of protection devices.

The device for relay protection of a two-winding transformer against short circuits has the following notation:

1 - transformer;

2 - switch;

3 - power source;

4 - current transformers at the input of the object;

5 - current transformers at the output of the object;

6 - switch;

7, 8, 9 - measuring organs - current relay, at the input of the object;

10, 11 - measuring organs - current relay, at the output of the object;

12 - source (+) (-) of operational current;

13 - intermediate relay (repeater of measuring organs 7, 8, 9);

14 - output intermediate relay (shutdown body) of the device;

15 - time relay protection device;

16 - a circuit of the NC contacts of the measuring organs at the transformer output;

17 - pointer operation device without time delay;

18 - indicator of the operation of the device with a time delay;

19 - shutdown solenoid 2.

By measuring bodies 7, 8, 9 at the input of the object and 10, 11 at the output of the object, the device is included in current transformers 4 at the input and current transformers 5 at the output of the object, trip organ 14 to the electromagnet 19 of the circuit breaker. In the circuit of the operational circuits of the device, the measuring organs 7, 8, 9, the time delay organ 15, the trip organ 14, and the time delay device 18 of the device are connected according to the known maximum current protection device circuit.

A circuit 16 of series-connected disconnecting contacts of the measuring organs 10, 11 at the output of the object is connected between the contact 13.1 of the repeater of the measuring organs at the input of the object and the shutdown organ 14 of the device, forming a circuit of the device without delay.

The device operates as follows.

Short circuit location: in the transformer or on the external network section, measuring organs are detected at the output of the object.

In the mode without short circuits, the measuring organs at the input and output of the protection device are not tripped, the contacts of the measuring organs at the output are the current relays 10, 11 in the device’s operation circuit without time delay, and the device is put into operation on these circuits, with time delay operation circuits the device is also ready to operate.

In short-circuit modes, the protection device operates as follows.

In the event of a short circuit in transformer 1, point K-1, current transformers 4 are flowed by a short circuit current and the device is activated by a current relay 7, 8, 9, in the operational circuit diagram, their operation leads to the operation of the intermediate relay 13 and the closure of terminal 13.1 in the operation circuit protection without delay.

Current transformers 5 at the transformer output are not surrounded by a short circuit current, the current relays 10, 11 are not tripped, the circuit 16 of their NC contacts is closed and the protection device operates without a delay, and the output intermediate relay 14 is connected via a contact circuit 14.1 with a shutdown electromagnet 19 of circuit breaker 2 and It trips the transformer. The operation is fixed by pointer 17.

In the event of a short circuit in the external network area, point K-2, current transformers 5 flow around the short circuit current from source 1, which leads to the operation of current relays 10, 11, opening of their NC contacts in circuit 16 of the protection device without delay and the conclusion from operation of the device along the work circuit without a time delay. The protection device operates with a time delay. The operation is fixed by pointer 18.

The device of relay protection of the generator from short circuits has the following notation:

20 - generator;

21 - switch;

22 - other power sources;

23 - current transformers at the input of the object;

24 - current transformers at the output of the object;

25 - voltage transformer;

26, 27, 28 - current relay of the protection device at the input of the object;

29, 30, 31 - current relay of the protection device at the output of the object;

32, 33 - relay direction of the power of the device at the output of the object;

34 - source (+) (-) of operational current;

35 - intermediate relay (repeater of measuring organs 26, 27, 28);

36 - output intermediate relay (trip organ);

37 - time relay protection device;

38 - a chain of measuring organs at the output of the object;

39 - indicator of the operation of the device without time delay;

40 - indicator of the operation of the device with a time delay;

41 - shutdown solenoid 21.

By measuring bodies 26, 27, 28 at the input of the object and 29, 30, 31 and 32, 33 at the output of the object, the device is included in current transformers 23 at the input and current transformers 24, voltage transformer 25 at the output of the object, trip organ 36 to the electromagnet 41 circuit breaker 21. In the circuit of the operational circuits of the device, the measuring organs 26, 27, 28, the time delay unit 37, the tripping unit 36, and the operation indicator 40 of the device are connected according to the known circuit of the overcurrent protection device.

A chain of series-connected disconnecting contacts of the measuring organs of the current relay 29, 30, .31 and parallel-connected chains of the closing contacts of the power direction switch 32, 33, forming the chains of the measuring organs 38 at the output of the object, are connected between the contact 35.1 of the repeater of the measuring organs at the input of the object and the body shutdown 36 of the device and create a circuit operation of the device without delay.

Short circuit location: in the generator or on the external network section, measuring organs are detected at the output of the object.

The measuring organs at the generator output, given its parallel operation with other power sources, contain directional organs.

The relay protection device of the generator is as follows.

In the mode without short circuits, the measuring organs at the input and output of the protection device are not triggered, the contacts of the measuring organs at the output are the current relays 29, 30, 31 in the protection operation circuit without time delay, and the device is put into operation using these circuits By delaying the time, the device is also ready for operation.

In short-circuit modes, the device operates as follows.

In the event of a short circuit in the generator 20, point K-1, current transformers 23 are surrounded by a short circuit current and the current relays 26, 27, 28 are activated in the device, in the operational circuits of the device, their operation leads to the operation of the intermediate relay 35 and the closure of terminal 35.1 in the circuits device operation without time delay.

Current transformers 24 at the output of the generator are surrounded by a short circuit current from source 22, current relays 29, 30, 31 can be tripped, their NC contacts in the operation circuits of the device without time delay are open, but the circuit for operation of the device without time delay is closed by the contact of the power direction relay 32 or 33, directed to the generator, for which a short circuit in the generator is a short circuit in the zone and the device operates without delay. The shutdown body 36 through the circuit of the contact 36.1 flows around the current solenoid shutdown 41 of the switch 21 and it turns off the generator. The operation is fixed by pointer 39.

On a generator that is not connected to the network and has a short circuit in it, the device without a time delay is triggered by a circuit of series-connected disconnecting contacts of current relays. 29, 30, 31.

In case of three-phase short circuits in the “dead zone”, the microprocessor protection power direction relays trip along the memory circuit.

In the event of a short circuit in the external network area, point K-2, current transformers 24 flow around the short circuit current from the generator, which leads to the triggering of measuring organs - current relays 29, 30, 31, and failure of the power direction relay, leading to the opening of the contacts in the circuits 38 measuring bodies at the output of the device and the decommissioning of the circuit of the device without delay. The device operates with a time delay. The operation is fixed by pointer 40.

The relay protection device of the autotransformer against short circuits has the following notation:

42 - autotransformer;

43 - the switch of the highest side of the autotransformer;

44 - switch the middle side of the autotransformer;

45, 46 - power sources;

47 - current transformers at the input of the higher side; autotransformer;

48 - current transformers at the inlet of the middle side of the autotransformer;

49 - current transformers at the output of the autotransformer;

50 - low voltage side switch;

51, 52 - voltage transformers on the sides of the autotransformer;

53 - measuring unit of the device is remote, at the entrance of the higher side of the autotransformer;

54 - measuring unit of the device is remote, at the inlet of the middle side of the autotransformer;

55, 56 - measuring organs of the device - current relay at the output of the autotransformer;

57 - intermediate relay (repeater response of the measuring organs at the input) of the device;

58 - output intermediate relay (shutdown body) of the device;

59 - time relay protection device;

60 - indicator of the operation of the protection device without time delay;

61 is a time delay indicator of a protection device;

62 - electromagnet tripping switch 43 side of the higher voltage;

63 - electromagnet tripping switch 44 side medium voltage;

64 - shutdown solenoid 50 of the low voltage side switch 50;

65, 66 - measuring organs of the protection device - relay direction of power at the output of the object;

67 - voltage transformer on the low voltage side of the autotransformer;

68 - shunt switch of the measuring organs at the input side of the higher voltage side of the autotransformer in the operational current circuits of the device;

69 is a shunt switch of the measuring organs at the input side of the medium voltage side of the autotransformer in the operational current circuits of the device;

70 - circuit measuring organs at the output of the object in the circuit operational circuits of the protection device;

71 - power sources on the low voltage side of the autotransformer, often found in the form of large synchronous electric motors of consumers, etc.

72 - source (+) (-) of operational current.

By measuring bodies 53, 54 at the input and 55, 56 and 65, 66 at the output of the object, the device is included in current transformers 47, 48 and voltage transformers 51, 52 at the input of the object and current transformers 49 and voltage transformer 67 at the output of the object, shutdown organ 58 - to the electromagnets 62, 63, 64 of the tripping of the switches 43, 44, 50. In the operational circuits of the device, the measuring organs 53, 54 are connected in series and together with the time delay 59, the trip 58 and the indicator 61 of the device are connected according to the known device circuit ARISING distance protection autotransformer.

A chain of series-connected opening contacts of the measuring organs 55, 56 and parallel-connected chains of series-connected closing contacts of the current relay 55, 56 and the power direction switch 65, 66, forming the chains of measuring bodies 70 at the output of the object, are connected between the contact 57.1 of the repeater of the measuring organs at the input object and shutdown body 58 of the device create a circuit device without delay.

The relay protection device autotransformer works as follows.

Short circuit location: in the autotransformer or on the external network section, measuring organs are detected at the output of the object.

In the mode without short circuits, the measuring organs of the device at the input and output are not triggered, the contacts of the measuring organs are the current relays 55, 56 in the circuit of the protection device without a time delay closed and the device is put into operation on these circuits, the device also ready to fire.

In short-circuit modes, the device operates as follows.

In the event of a short circuit in the autotransformer 42, point K-1, current transformers 47 and 48 flow around with a short circuit current from sources 45, 46 and the remote controls 53, 54 are triggered, in the circuit of the operational protection circuits, their operation leads to the operation of the intermediate relay 57 and the contact closes 57.1 in the operation circuit of the device without time delay.

Current transformers 49 at the output of the autotransformer are flowed by a short circuit current from source 71 and current relays 55, 56 can be tripped, their opening contacts in the device operation circuits are open without time delay, but the circuit formed by the closing contact of the current relay 55, 56 and the direction relay is closed power 65, 66, directed to the autotransformer, for which a short circuit in the autotransformer is a short circuit in the zone, the device operates without delay, and the shutdown body 58 for contact circuits 58.1 to 58.2, 58.3 are streamlined tripping current electromagnets 62, 63, 64 of switches 43, 44, 50 and they produce off the autotransformer. The operation of the device is fixed by the pointer 60.

In the event of a short circuit in the external network, point K-2, a short circuit current is flowed around and the measuring organs 55, 56 of the device are triggered at the output from the sources 45, 46 of the upper and middle sides of the autotransformer, they open the NC contacts in the device operation circuits without a time delay of 70 and take the device out of operation on these circuits. The device operates with a time delay. The operation is fixed by pointer 61.

In the mode of single-sided power supply of the autotransformer from the high voltage side with the medium voltage circuit breaker 44 turned off, remote measuring bodies at the input of the autotransformer of the medium voltage side are turned off by the switch 69 in the operational circuits of the device, by switching on which their contacts are shunted in the operation circuit of the intermediate relay 57. Similarly, by turning on the switch 68 remove from the work the remote measuring organs of the device at the input of the autotransformer of the higher voltage side at third-party power supply of the autotransformer from the medium voltage side with the switch 43 of the high voltage side disconnected.

In both cases, the protection device remains in operation.

In the protection of an autotransformer without a power source on the low voltage side, measuring bodies are excluded - a power direction relay at the autotransformer output.

The device of the relay protection of the reactor in figure 4 from short circuits has the following notation:

73 - reactor;

74 - switch;

75 - power source;

76 - current transformers at the input of the object;

77 - current transformers at the output of the object;

78 - switch;

79, 80, 81 - measuring bodies - current relay, at the input of the object;

82, 83, 84 - measuring organs of the current relay at the output of the object;

85 - source (+) (-) of operational current;

86 - intermediate relay (repeater of measuring organs 7,8,9);

87 - output intermediate relay (shutdown organ) of the device;

88 - device time relay;

89 - a circuit of the disconnecting contacts of the measuring organs at the output of the object;

90 - indicator of the operation of the protection device without time delay;

91 is a trip indicator of a time delay protection device;

92 - solenoid tripping switch 2.

By measuring bodies 79, 80, 81 at the input of the object and 82, 83 84 at the output of the object, the device is connected to current transformers 76 at the input and current transformers 77 at the output of the object, by the trip organ 87 to the electromagnet 92 of the circuit breaker 74 tripping. In the device’s operational circuit diagram measuring bodies 79, 80, 81, a time delay body 88, a shutdown body 87 and a trip indicator of a device 91 are connected according to a known circuit of a device for overcurrent protection of a reactor.

The circuit 89 of the series-connected disconnecting contacts of the measuring bodies 82, 83, 84 at the output of the object is connected between the contact 86.1 of the repeater of the measuring bodies at the input of the object and the shutdown body 87 of the device, forming a circuit of the device without delay.

The device operates as follows.

Short circuit location: in the reactor or on the external network section, measuring organs are detected at the outlet of the reactor ..

In the mode without short circuits, the measuring organs at the input and output of the protection device are not triggered, the contacts of the measuring organs at the output are the current relays 82, 83, 84 in the device’s operation circuit without time delay, and the device is put into operation using these circuits time delay is also ready to operate.

In short-circuit modes, the protection device operates as follows.

In case of a short circuit in the reactor 79, point K-1, current transformers 76 are flowed around by a short circuit and the current relay 79, 80, 81 are activated in the protection device, in the operational circuit diagram, their operation leads to the operation of the intermediate relay 86 and the closure of contact 86.1 in the circuits device operation without time delay.

Current transformers 77 at the output of the reactor are not surrounded by a short circuit current, current relays 82, 83, 84 are not tripped, the circuit of their NC contacts 89 is closed and the device operates without delay, and the shutdown body 87 passes through the contact circuit 87, the shut-off electromagnet 92 of switch 92 is circled and he shuts down the reactor. The operation is fixed by the pointer 90.

In the event of a short circuit in the external network, point K-2, current transformers 77 flow around the short circuit current from source 75, which leads to the operation of current relays 82, 83, 84, opening of their NC contacts in the device operation circuit 89 without delay and output from the operation of the device along the work circuit without a time delay. The protection device operates with a time delay. The operation is fixed by pointer 91.

An object relay protection device with two and a large number of outputs, for example: a three-winding transformer, a two-winding transformer with one winding split into parts, a split reactor and others. Their protection devices are of the same type and therefore the device description is given for one of them - a three-winding transformer.

The relay protection device of a three-winding transformer against short circuits in figure 5 has the following notation:

93 - transformer;

94 - switch of the highest side of the transformer;

95 - switch the middle side of the transformer;

96 - power source;

97 - current transformers of the device at the input of the transformer;

98 - current transformers of the device at the output of the middle side of the transformer;

99 - current transformers of the device at the output of the lower side of the transformer;

100 - low voltage side switch;

101, 102, 103 - measuring organs of the device at the input of the object;

104, 105 - measuring organs of the device at the output of the middle side of the object;

106, 107 - measuring organs of the device at the output of the lower side of the object;

108 - intermediate relay (repeater of measuring organs at the input of the object);

109 - output intermediate relay (shutdown organ) of the device;

110 - time relay protection device;

111 - device operation indicator without time delay;

112 - the indicator of the operation of the device with a time delay;

113 - shutdown electromagnet of the high voltage side switch 94;

114 - circuit measuring organs at the output of the middle side of the transformer in the circuit operational circuits of the device;

115 - circuit measuring organs at the output of the lower side of the transformer in the circuit operational circuits of the device;

116 - source (+) (-) of operational current of the protection device.

By measuring bodies 101, 102, 103 at the input of the object, 104, 105 at the output of the middle side and 106, 107 at the output of the lower side of the object, the device is connected to current transformers 97, 98, 99, by the trip organ 109 to the electromagnet 113 of the circuit breaker 94.

In the diagram of the operational circuits of the device, the measuring organs 101, 102, 103, the time delay device 110, the shutdown organ 109 and the device actuation indicator 111 are connected according to the known circuit of the transformer overcurrent protection device.

The circuits 114 of the serially connected opening contacts of the measuring bodies 104, 105 at the output of the middle side and the circuit 115 of the serially connected opening contacts of the measuring bodies 106, 107 at the output of the lower side of the transformer are connected in series, connected between the contact 108.1 of the repeater of the measuring bodies at the input of the object and the shutdown body 109 of the device , forming a circuit operation of the device without delay.

The relay protection device of the transformer operates as follows.

Short circuit location: in the transformer or on the external network section, measuring organs are detected at the outputs of the object.

In the mode without short circuits, the measuring organs of the device at the input and outputs of the object are not triggered, the contacts of the measuring organs - current relays 104, 105, 106, 107 in the device’s operation circuit are closed without delay, and the device is put into operation on these circuits, on working with By delaying the time, the device is also ready for operation.

In short-circuit modes, the device operates as follows.

In case of a short circuit in transformer 93, point K-1, current transformers 97 are flowed by a short circuit current from source 96 and the measuring organs 101, 102, 103 at the input of the object are triggered in the device, in the circuit of the device’s operational circuits, their operation leads to an intermediate relay 108 and the closure of contact 108.1 in the circuit of the device without delay.

Current transformers 98 and 99 at the transformer outputs are not surrounded by a short circuit current, measuring organs 104, 105, 106, 107 are not tripped, their NC contacts in circuits 114 and 115 are closed and the device operates without delay. The shutdown body 109 through the contact circuit 109.1 flows around the current solenoid shut-off 113 of the switch 93 and it turns off the transformer. The operation of the device is fixed by the pointer 111.

In the event of a short circuit in sections of the external network, the point K-2 or K-3, flows around with a short circuit and the measuring organs 104,105 or 106, 107 of the device are triggered at the outputs from source 96, they open the NC contacts in the operation circuits of the device without a delay of 114 or 115 and take the device out of operation on these circuits. The device operates with a time delay. The operation is fixed by the pointer 112.

Relay protection device at the input of an object with two or more inputs. An example of such an object is a multi-winding transformer operating in a block with generators. The feature of the object is that at each input two sets of measuring organs are installed: one for the protection device at the entrance, the second as measuring organs at the output of the protection devices at the other inputs.

Relay protection devices of a multi-winding transformer operating in a block with generators, in Fig.6 have the following notation:

116 - transformer with a split winding of the low voltage side having windings:

116.1 - winding of the side of higher voltage;

116.2, 116.3 - windings of the low voltage sides;

117 - power source on the higher voltage side of the transformer;

118 - switch on the high voltage side of the transformer;

119 - electromagnet tripping circuit breaker;

120, 123 - generators;

121, 124 - generator switches;

122, 125 - breaker electromagnets;

126, 127 - current transformers on the sides of the low voltage

transformer;

128, 129 - voltage transformers on the sides of the lower voltage of the transformer;

130 - current transformers on the higher voltage side of the transformer;

131 - voltage transformer on the higher voltage side of the transformer.

Measuring organs of the winding 116.1 of the high voltage side of the transformer:

132, 133, 134 - measuring bodies at the entrance of the object;

135, 136, 137 - measuring bodies at the exit of the object;

138, 139, 140 - measuring bodies of the direction of power at the output of the object.

Measuring organs of the winding 116.2 low voltage side of the transformer:

141, 142, 143 - measuring bodies at the entrance of the object;

144, 145, 146 - measuring bodies at the exit of the object

147, 148, 149 - measuring bodies of the direction of power at the output of the object.

Measuring organs of the winding 116.3 low voltage side of the transformer:

150, 151, 152 - measuring bodies at the entrance of the object;

153, 154, 155 - measuring bodies at the exit of the object;

156, 157, 158 - measuring organs of the direction of power at the output of the object.

In the scheme of operational circuits of devices, Fig.6. Sheet 2, 6. Sheet 3:

159, 162, 165 - intermediate relay (repeater of measuring organs at the input);

160, 163, 166 - output intermediate relay (trip organs) of devices;

161, 164, 167 - body time delay device;

168, 169, 170 - intermediate relay (repeater of measuring organs at the output of the object);

174, 176, 178 - operation indicator of the protection device without time delay;

175, 177, 179 - operation indicator of the protection device with time delay;

180, 181, 182 - chain measuring organs at the outputs of the object;

183 - zero sequence current protection current relay on the higher voltage side of the transformer;

184 - zero direction sequence overcurrent power direction switch on the higher voltage side of the transformer;

185 is a zero sequence current trip indicator.

Protection devices by measuring bodies at the input and output of the object along the current and voltage circuits, Fig.6. Sheet 1, connected to current transformers 126, 127, 130 and voltage transformers 128, 129, 131 of the sides of the higher and lower voltages according to known schemes.

In the circuit of the operational circuits of each device, the measuring organs at the input of the object, the time delay organ, the trip organ and the device operation indicator with time delay are connected according to the known maximum current protection device circuit.

The circuit of the series-connected NC contacts of the measuring organs - the current relay and the chains of the series-connected NC contacts of the current relay and the power direction relay, forming circuits of the measuring organs 180, 181, 182 at the outputs of the object, are included in the circuit of the transformer protection device using relay repeaters 168, 169, 170.

In Fig.6. Sheet 2, Fig.6. Sheet 3 shows the schematic diagrams of the operational circuits of the devices.

For the low voltage side protection device of the transformer winding 116.2, the measuring elements at the input are the current relays 141, 142, 143, and the measuring organs at the outputs are the measuring organs at the output of the high voltage side winding 116.1, represented by the relay-follower 168, contact 168.1, and measuring organs at the output of the winding 116.3 the low voltage sides, represented by the relay - follower 170, contact 170.1.

Serially connected contacts 168.1 and 170.1 of the repeaters of the measuring organs at the outputs of the object are connected between the contact 162.1 of the repeater of the measuring organs at the input of the object and the shutdown body 163 of the device and form a device operation circuit without time delay.

The protection device operates as follows.

Short circuit location: in the transformer or on the external network section, measuring organs are detected at the outputs of the object.

In the mode without short circuits, the measuring organs of the device 141, 142, 143 at the input and outputs of the transformer 135, 136, 137 and 153, 154, 155 are not triggered, the disconnecting contacts of the measuring organs in the operation circuit of the device without time delay are closed and the device is connected to these circuits to work. According to the time delay circuits, the device is also ready for operation.

In the event of a short circuit in the transformer, point K-1, current transformers 126 are flowed around by a short circuit current from the generator 120, the current organs 141, 142, 143 are triggered in the device, in the operational circuits of the device, their operation leads to the operation of the intermediate relay 162 and the closure of contact 162.1 in the circuits of the protection device without delay. In the circuits of the measuring organs 180 and 182 at the outputs of the windings 116.1 and 116.3, the current organs 135, 136, 137 and 153, 154, 155 and the direction organs of power 138, 139, 140 and 156, 157, 158 directed to the transformer are triggered, for which a short circuit in the transformer is a short circuit in the zone, and the device operates without delay in the circuit of the series-connected contacts 162.1-168.1-170.1. The operation of the device is fixed by the pointer 176.

In case of three-phase short circuits in the “dead zone”, the microprocessor protection power direction relays trip along the memory circuit.

The transformer shown in FIG. 6 is tripartite and has protective devices on each side. In the event of a short circuit in the transformer, the protection devices on all sides are activated.

In case of an external short circuit, point K-3, a short circuit current is flowed around and the measuring organs 153, 154, 155 are triggered at the output of the side 116.3 of the object and open the NC contacts in the device operation circuits without time delay, the power direction switches 156, 157, 158 remain unused , since the short circuit for them is external, and in general the device on these circuits is put out of operation. The device on the contact circuits 162.2 and time relay 164 is activated with a time delay. The operation is fixed by pointer 177.

The operation of the device with an external short circuit at point K-4 is similar.

The operation of the protection device at the other inputs of the facility for their zones is similar.

In case of asymmetric short circuits to the ground (transformer tank casing) of the transformer high voltage winding, the directional current protection of the zero sequence 183, 184 is activated without a time delay. The operation is fixed by pointer 185.

Claims (2)

1. The relay protection device of a concentrated object from short circuits, which at the input contains the first measuring organs and operating circuits of the device with a time delay, additionally contains measuring organs at the output of the object and operating circuits of the device without a time delay. 2. The relay protection device according to claim 1, characterized in that in the operational circuits of the device without delaying the time of the object with several outputs, the measuring organs at the outputs of the object are connected in series.