JP2001037074A - Generator field loss protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filed loss protector which can detect the field loss of a cross-compound type power generation equipment with a primary generator and a secondary generator, even in a low frequency region and protect both the primary and secondary generator. SOLUTION: Armature currents, field currents or field voltage of a primary generator 1 and a secondary generator 2 are detected. If the detected armature currents are denoted by i1 and i2, the detected field currents are denoted by if1 and if2 and the detected field voltages are denoted by v1 and v2, so that protective operation is made according to the difference, ratio or phase difference between i1 and i2, the difference of ratio between if1 and if2, the difference or ratio between v1 and v2, the value of (i1-i2)/(|i1|+|i2|), the value of (if1-if2)/(|if1|+|if2|) or the value of (v1-v2)/(|v1|+|v2|).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator field loss protection device for a cross-compound type power generation facility having a primary generator and a secondary generator.

[0002]

2. Description of the Related Art When a loss of field occurs in a synchronous generator, the generator becomes an induction generator, and an eddy current flows through a field winding, a rotor, a wedge, and an end ring due to slip, and the rotor surface is overheated. In addition, no reactive power is supplied to the system, which adversely affects the system. Therefore, it is necessary to detect the loss of field and disconnect the generator from the system. A conventionally applied field loss protection device employs a method of detecting impedance as viewed from a generator terminal. When field loss occurs under various load conditions, the impedance seen from the generator terminal changes,
It operates when it enters the set circle.

[0003] The cross-compound type power generation equipment is composed of two primary and secondary generators. Conventionally, each of the two generators is provided with a dedicated field loss protection device. When starting the generator,
When each of the secondary generators is turned or reaches about half the rated speed, the primary,
Synchronizes the secondary generator. From this state, both the rotation speeds are increased while the primary and secondary are synchronized, and the system is synchronously incorporated into the system. That is, the generator is operated in a range where the frequency is lower than the rated value from the time when the excitation is applied to the time when the generator is incorporated into the system.

[0004]

Since the impedance is also reduced in the low frequency state, if the field loss occurs at this time, there is a high possibility that the conventional field loss protection device will not operate. There is a problem that the loss of field cannot be protected in the process of increasing the speed of the generator from the time when the power is applied to the time when the generator is incorporated into the system.

The present invention has been made in view of the above circumstances, and in a cross-compound type power generation facility including a primary generator and a secondary generator, loss of field can be detected even in a low frequency region. An object of the present invention is to provide a loss-of-field protection device capable of protecting both primary and secondary generators with one protection device.

[0006]

In order to achieve the above object, the present invention is directed to a cross-compound type power generation facility having a primary generator and a secondary generator, wherein the armature current of each of the generators is reduced. A generator field loss protection device characterized in that it is configured to detect and operate according to a difference in the magnitude of the current.

In the protection device configured as described above, when the field loss occurs in one of the generators, current flows from the other generator, so that the armature current of the primary generator and the secondary generator Is significantly larger than in the normal case. Therefore, loss of field can be detected regardless of the frequency.

Further, according to a second aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, an armature current of each generator is detected, and operation is performed based on a phase difference between the detected currents. Provided is a generator field loss protection device characterized by having such a configuration.

In the protection device configured as described above, the armature current of the primary generator and the armature current of the secondary generator are normally in phase, but the field loss occurs in one of the generators. Phase (180 degrees phase difference)
Therefore, due to the phase difference between the armature currents of both generators,
Field loss can be detected regardless of the frequency.

In a third aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, a field current of each generator is detected, and a difference between the detected currents is determined. A generator field loss protection device is provided that is configured to operate.

In the protection device configured as described above, when the field loss occurs in one of the generators, the field current of the generator is reduced, so that the field between the primary generator and the secondary generator is reduced. The difference in the magnitude of the magnetic current becomes significantly larger than in the normal state. Therefore, loss of field can be detected regardless of the frequency.

According to a fourth aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, a field voltage of each of the generators is detected, and a difference between the magnitudes of the detected voltages is detected. A generator field loss protection device is provided that is configured to operate.

In the protection device configured as described above, when the field loss occurs in one of the generators, the field voltage of the generator is reduced, so that the primary generator and the secondary generator Is significantly larger than that in the normal state. Therefore, loss of field can be detected regardless of the frequency.

According to a fifth aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, field loss protection by a method of detecting impedance as viewed from an armature terminal of each generator. Provided is a generator field loss protection device characterized by installing a device and changing a set value according to a frequency during operation.

In the protection device configured as described above, even if the field loss occurs while the generator is operating in the low frequency range, the protection device operates with the impedance according to the state. It is possible to detect loss of field regardless of the frequency.

According to a sixth aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, the current of each generator armature is detected, and the magnitude of the current is increased during low frequency operation. A power generation device that operates as an overcurrent protection device by operating as a loss of field protection device due to the difference in the magnitude of the current when operating at the rated frequency after being incorporated into the system. A protection device for loss of field is provided.

In the protection device configured as described above, when the field loss occurs in one of the generators during low-frequency operation, current flows from the other generator, so that the primary generator and the secondary generator The difference in the magnitude of the current of the machine becomes significantly larger than in the normal state. For this reason, it is possible to detect the loss of field regardless of the frequency, and it is possible to detect an overcurrent when a short circuit fault occurs during the operation at the rated frequency after being incorporated into the system.

According to a seventh aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, an armature current of each of the generators is detected, and a magnitude ratio of the detected currents is used. A generator field loss protection device is provided that is configured to operate.

In the protection device configured as described above, when the field loss occurs in one of the generators, the current flows from the other generator, so that the currents of the primary generator and the secondary generator are large. The ratio of the height is significantly larger than that in the normal state. Therefore, loss of field can be detected regardless of the frequency.

Further, according to the invention of claim 8, in a cross-compound type power generation facility having a primary generator and a secondary generator, an armature current of each generator is detected, and the detected currents are defined as i1 and i2. Time (i1 -i
2) A generator field loss protection device characterized by being configured to operate with a value represented by / (| i1 | + | i2 |).

In the protection device configured as described above, when the field loss occurs in one of the generators, a current flows from the other generator, so that the detected current of the primary generator and the detected current of the secondary generator are reduced. The detected current is i1,
Let i2 be (i1-i2) / (| i1 | + | i2
The value indicated by |) is significantly larger than normal, or significantly smaller. Therefore, loss of field can be detected regardless of the frequency.

According to a ninth aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, a field current of each generator is detected, and a magnitude ratio of the detected currents is used. A generator field loss protection device is provided that is configured to operate.

In the protection device configured as described above, when the field loss occurs in one of the generators, the field current of the generator is reduced. The ratio of the magnitudes of the currents becomes significantly larger than that in the normal state. Therefore, loss of field can be detected regardless of the frequency.

According to a tenth aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, the field currents of the respective generators are detected, and the detected currents are referred to as if1 and if2. Time (if1
-If2) / (| if1 | + | if2 |) is provided so as to operate according to a value represented by the following equation.

In the protection device configured as described above, when the field loss occurs in one of the generators, the field current of the generator is reduced, and thus the detected current of the primary and secondary generators is reduced. When if1 and if2 (i
The value represented by f1−if2) / (| if1 | + | if2 |) is significantly larger than the normal value or conversely smaller. Therefore, loss of field can be detected regardless of the frequency.

According to the eleventh aspect of the present invention, in a cross-compound type power generation facility having a primary generator and a secondary generator, the field voltage of each generator is detected, and the magnitude of the detected voltage is determined by the ratio of the detected voltages. A generator field loss protection device is provided that is configured to operate.

In the protection device configured as described above, when the field loss occurs in one of the generators, the field voltage of the generator is reduced, and thus the field voltages of both the primary and secondary generators are reduced. The ratio of the magnitudes of the voltages becomes significantly larger than that in the normal state. Therefore, loss of field can be detected regardless of the frequency.

Further, according to a twelfth aspect of the present invention, in a compound type power generation facility having a primary generator and a secondary generator, when the field voltages of the respective generators are detected and the detected voltages are defined as v1 and v2. (V1 -v2) /
(V1 | + | v2 |) is provided so as to operate at a value indicated by (| v1 | + | v2 |).

In the protection device configured as described above, when the field loss occurs in one of the generators, the field point pressure of the generator is reduced, and thus the detection of both the primary and secondary generators is performed. When the voltages are v1 and v2 (v1 −
The value represented by (v2) / (| v1 | + | v2 |) becomes significantly larger than the normal time or conversely becomes smaller.
Therefore, loss of field can be detected regardless of the frequency.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a generator field loss protection device according to the present invention will be described below with reference to FIGS. FIG. 1 is a connection diagram showing a first embodiment of the present invention.

Primary generator 1 and secondary generator 2
In the cross-compound type power generation equipment having the following, current transformer 4 for detecting current I1 flowing through armature of primary generator 1 and current I flowing through armature of secondary generator 2
And a current transformer 5 for detecting the current. In the generator field loss protection device 3, an operating coil 6 is provided. The operating coil 6 includes a secondary current i1 of the current transformer 4 and a secondary current i of the current transformer 5.
The difference current from 2 flows. When the magnitude of the difference current exceeds a certain set value, the generator field loss protection device 3 operates.

FIG. 2 is a vector diagram of a current flowing through the generator in the first embodiment. In a normal state, the primary generator 1 and the secondary generator 2 are synchronously speeding up, so that the output of the primary generator 1 and the output of the secondary generator 2 are almost equal, and the primary generator 1 And the current I2 flowing through the armature of the secondary generator 2 is almost zero, and the difference current between i1 and i2 flowing through the working coil 6 is almost zero. When the output of the primary generator 1 and the output of the secondary generator 2 are different, as shown in FIG. 2, although the armature currents I1 and I2 of the two generators are different, the phases are equal, and The currents i1 and i2 on the secondary side of the current transformer are also different in magnitude, but have the same phase.
A small current that differs from 2 flows.

On the other hand, when a field loss occurs in one of the generators, for example, in the secondary generator 2, the armature current of the secondary generator 2 in which the field is lost has a phase opposite to that in the normal state. Therefore, as shown in FIG. 2, the armature currents I1 and I2 'of both generators have opposite phases. Accordingly, the secondary currents i1 and i2 'of both current transformers are also in opposite phases, so that the difference current between i1 and i2' flowing through the working coil 6 becomes excessive.

Therefore, if the operating current value of the generator field loss protection device 3 is set between the difference current flowing in the operating coil 6 in the normal state and the difference current flowing in the field loss, the generator field loss protection device will be set. No. 3 does not operate in a normal state, but operates only when the field is lost.

Thus, according to the present embodiment, the loss of field protection device 3 operates according to the difference between the magnitudes of the armature currents of the primary and secondary generators 1 and 2, so that the loss of field can be prevented even in a low frequency range. The primary and secondary generators can be protected by a single protection device.

FIG. 3 is a connection diagram showing a second embodiment of the present invention. In a cross-compound type power generation facility having a primary generator 1 and a secondary generator 2,
A current transformer 4 for detecting a current I1 flowing through the armature of the primary generator 1 and a current transformer 5 for detecting a current I2 flowing through the armature of the secondary generator 2 are provided. A phase comparison circuit 7 is provided in the generator field loss protection device 3. The phase comparison circuit 7 includes a secondary current i1 of the current transformer 4 and a current
Flows on the secondary side current i2. In this phase comparison circuit 7, the phase of i1 is compared with the phase of i2, and the phase difference is
When the angle falls within a certain set range around 180 degrees, the generator field loss protection device 3 operates.

In the normal state, the primary generator 1 and the secondary generator 2 are synchronized, and as shown in FIG. The currents I1 and I2 are in phase, and the secondary currents i1 and i2 of both current transformers 4 and 5 are also in phase.

On the other hand, when a field loss occurs in one of the generators, for example, in the secondary generator 2, the armature current of the secondary generator 2 in which the field is lost has a phase opposite to that in the normal state. Therefore, as shown in FIG. 2, the armature currents I1 and I2 'of both generators have opposite phases, and the secondary currents i of both current transformers are
1 and i2 'also have opposite phases.

Therefore, if the range of the phase difference in which the generator field loss protection device 3 operates is set to a range of more than 0 degree and less than 360 degree around 180 degrees, the generator field loss protection device 3 It does not operate during normal operation, and operates only when the field is lost.

As described above, according to the present embodiment,
Since the field loss protection device operates according to the phase difference between the currents of the primary and secondary generators, the field loss is detected even in a low frequency range, and the primary and
Protection of both secondary generators is possible.

FIG. 4 is a connection diagram showing a third embodiment of the present invention. In a cross-compound type power generation facility having a primary generator 1 and a secondary generator 2,
A shunt 10 for detecting a current If1 flowing through the field winding 8 of the primary generator 1 and a shunt 11 for detecting If2 flowing through the field winding 9 of the secondary generator 2 are provided. The secondary current if1 of the shunt 10 and the secondary current if2 of the shunt 11 are input to the generator field loss protection device 3. An operating coil 6 is provided in the generator field loss protection device 3, and a current difference between the current if1 and the current if2 flows through the operating coil 6. When the magnitude of the difference current exceeds a certain set value, the generator field loss protection device 3 operates.

Under normal conditions, a field current flows through both the primary generator 1 and the secondary generator 2, and a current If 1 flowing through the field winding 8 of the primary generator 1 and a field winding 9 of the secondary generator 2 Since the difference in the magnitude of the current If2 flowing through the coil is small, a small current having a difference between if1 and if2 flows through the operation coil 6.

On the other hand, when a field loss occurs in one of the generators, for example, in the secondary generator 2, the field current of the field generator 2 in which the field is lost decreases, so that the operating coil 6 The difference current between if1 and if2 'flowing through the circuit becomes excessive.

Therefore, if the operating current value of the generator field loss protection device 3 is set between the difference current flowing in the operating coil 6 in the normal state and the difference current flowing in the field loss, the generator field loss protection device will be set. No. 3 does not operate in a normal state, but operates only when the field is lost.

As described above, according to the present embodiment, the field loss protection device operates according to the difference between the magnitudes of the field currents of the primary and secondary generators, so that the field loss can be prevented even in the low frequency range. Detecting and further protecting both the primary and secondary generators with one protection device.

FIG. 5 is a connection diagram showing a fourth embodiment of the present invention. In a cross-compound type power generation facility having a primary generator 1 and a secondary generator 2,
The protection device 3 detects the field voltage V1 of the primary generator 1 and detects it.
And a converter 13 for detecting the field voltage V2 of the secondary generator 2 and converting it to a voltage to be input to the protection device 3. A signal v1 obtained by converting the field voltage V1 of the primary generator 1 and a signal v2 obtained by converting the field voltage V2 of the secondary generator 2 are input to the generator field loss protection device 3. In the generator field loss protection device 3, a difference between the signal v1 and the signal v2 is detected, and when the difference exceeds a certain set value, the generator field loss protection device 3 operates.

In a normal state, both the primary generator 1 and the secondary generator 2 have a field voltage, so that the primary generator 1 has a field voltage V1 and the secondary generator 2 has a field voltage V2.
Is small, and the difference between the input signals v1 and v2 to the protection device 3 is very small.

On the other hand, when a field loss occurs in one of the generators, for example, in the secondary generator 2, the field voltage of the secondary generator 2 in which the field is lost decreases, so that the protection device 3 The difference between the input signals v1 and v2 'is excessive.

Therefore, by setting the operation value of the generator field loss protection device 3 between the difference between the normal state of the input signal to the protection device 3 and the field loss, the generator field loss protection can be achieved. The device 3 does not operate during normal operation, and operates only when the field is lost.

As described above, according to the present embodiment, the loss of field protection device operates according to the difference between the magnitudes of the field voltages of the primary and secondary generators. Detecting and further protecting both the primary and secondary generators with one protection device.

FIG. 6 is a connection diagram of the fifth embodiment. In a cross-compound type power generation facility having a primary generator 1 and a secondary generator 2, a field loss protection device 3 is installed in each of the generators by a method of detecting impedance as viewed from a generator terminal, and the frequency during operation is set. Change the set value according to. FIG. 7 is a characteristic diagram of the generator field loss protection device 3 used in the fifth embodiment. In this figure, R is resistance, X is reactance, Xd
Is a synchronous reactance, and Xd 'is a transient reactance. Since the impedance is proportional to the frequency, for example, when operating at a frequency of Kpu which is K times the rated frequency, the set value is also set to Kpu. The magnetism loss protection device 3 can operate.

According to the present embodiment, since the set value is changed in accordance with the operating frequencies of both the primary and secondary generators, a field loss protection device capable of detecting field loss even in a constant frequency region can be provided. .

Next, a sixth embodiment will be described. In this embodiment, the connection diagram when the generator is operated at a low frequency is the same as FIG. 1 showing the first embodiment. That is, in a cross-compound type power generation facility having a primary generator 1 and a secondary generator 2, a current transformer 4 for detecting a current I1 flowing through an armature of the primary generator 1
And a current transformer 5 for detecting a current I2 flowing through the armature of the secondary generator 2. When the generators 1 and 2 are operated at a low frequency, the operating coil 6 in the loss-of-field protection device 3 has the secondary current i1 of the current transformer 4 and the current
A difference current from the secondary current i2 flows. When the magnitude of the difference current exceeds a certain set value, the generator field loss protection device 3
Works.

When the generator is operating at the rated frequency, the detection circuit is switched as shown in FIG.
, A combined current of the secondary current i1 of the current transformer 4 and the secondary current i2 of the current transformer 5 flows. When the magnitude of the combined current is equal to or greater than a certain set value, the device operates as the generator overcurrent protection device 15.

In the sixth embodiment, the operation of the generator field loss protection device 3 at the time of low frequency is the same as that of the first embodiment. It does not operate during normal operation, and operates only when the field is lost. During the rated frequency operation, the overcurrent protection device 15 is used. If a short circuit accident occurs in the armature circuit at this time, the current I1 flowing through the armature of the primary generator 1 and the armature of the secondary generator 2 due to the short circuit current. The current I2 flowing through
The secondary current i1 of the current transformer 4 and the secondary current i2 of the current transformer 5
Therefore, the combined current of i1 and i2 flowing through the working coil 6 increases.

Therefore, if the operating current value is set between the combined current flowing in the operating coil 6 of the generator overcurrent protection device 15 in the normal state and the combined current flowing in the short-circuit accident, it does not operate in the normal state, and only operates in the short-circuit accident. Operate.

According to the present embodiment, when the frequency is low, the primary and secondary generators operate as a field loss protection device due to the difference in the magnitude of the armature current. Operate. Therefore, in the low frequency range, the primary and secondary generators can be protected by one protection device by detecting the loss of the field, and the field loss protection device that can also be used as the overcurrent protection device during the rated frequency operation. Can be provided.

Next, a description will be given of a seventh embodiment of the present invention. The connection diagram is the same as that of FIG. 1 showing the first embodiment. The difference from the first embodiment is that the ratio between the currents i1 and i2 flowing through the coil 6 in the generator field loss protection device 3 is detected. As in the first embodiment,
If field loss occurs in one generator, i1 and i2
Since the magnitude of the current ratio is significantly different from the value of the current ratio in the normal state, when the value of the current ratio exceeds or falls below a certain set value, it is determined that the generator field is lost, and the protection device 3 is operated. Let it.

According to the present embodiment, the loss-of-field protection device 3 operates according to the ratio between the magnitudes of the armature currents of the primary and secondary generators. One protection device can protect both the primary and secondary generators.

FIG. 9 is a connection diagram showing the eighth embodiment. The circuit configuration is the same as that of FIG. 1 showing the first embodiment, except that the currents i1 and i flowing through the coil 6 in the generator field loss protection device 3 are different from the first embodiment.
2 is that a value represented by (i1-i2) / (| i1 | + | i2 |) is calculated and used for operation determination. In the same manner as in the first embodiment, the armature current in the generator in which the field loss has occurred has an opposite phase to the armature current as compared with the healthy generator, so that (i1 -i2) / (| i1 | + The magnitude of the value indicated by (| i2 |) is significantly larger than that in the normal state, and when this value exceeds a certain set value, it is determined that the generator field is lost, and the protection device 3 is operated. .

According to the present embodiment, assuming that the armature detection currents of both the primary and secondary generators are i1 and i2, a value represented by (i1−i2) / (| i1 | + (| i2 |) The field loss protection device 3 is operated by
Even in the low frequency range, the loss of field can be detected, and furthermore, both the primary and secondary generators can be protected by one protection device.

Next, a ninth embodiment of the present invention will be described. The connection diagram is the same as FIG. 4 showing the third embodiment. The difference from the third embodiment lies in the currents if1 and if2 flowing through the coil 6 in the generator field loss protection device 3.
The point is that the ratio is detected. Similarly to the third embodiment, when the field loss occurs in one of the generators, i
Since the magnitude of the current ratio between f1 and if2 is significantly different from the value of the current ratio under normal conditions, when the value of this current ratio exceeds or falls below a certain set value, it is determined that the field of the generator has been lost, and protection is performed. The device 3 is operated.

According to the present embodiment, the loss-of-field protection device 3 operates according to the ratio of the magnitudes of the field currents of the primary and secondary generators. One protection device can protect both the primary and secondary generators.

FIG. 10 is a connection diagram showing a tenth embodiment. The circuit configuration is the same as that of FIG. 4 showing the third embodiment, except that the currents if1 and if2 flowing through the coil 6 in the generator field loss protection device 3 are different from those of the third embodiment.
From (if1−if2) / (| if1 | + | if2 |)
Is calculated and used for operation determination. In the same manner as in the third embodiment, in the generator in which the field loss has occurred, the field current decreases, so that (if1-if2)
) / (| If1 | + | if2 |) is significantly larger than the normal value, so that when the value exceeds a certain set value, it is determined that the field of the generator has been lost. 3 is operated.

According to the present embodiment, assuming that the field detection currents of both the primary and secondary generators are if1 and if2, (if1−if2) / (| if1 | + | if2 |)
Since the loss-of-field protection device 3 operates according to the value indicated by, the loss of field can be detected even in a low-frequency region, and both the primary and secondary generators can be protected by one protection device.

Next, an eleventh embodiment of the present invention will be described. The connection diagram is the same as FIG. 5 showing the fourth embodiment. The difference from the fourth embodiment is that the ratio between the input signals v1 and v2 is detected in the generator field loss protection device 3. As in the third embodiment, when the field loss occurs in one of the generators, the magnitude of the ratio between v1 and v2 is significantly different from the value of the ratio in the normal state. Is determined to be a loss of the generator field, and the protection device 3 is activated.

According to the present embodiment, the loss-of-field protection device 3 operates according to the ratio of the magnitudes of the field voltages of both the primary and secondary generators. One protection device can protect both the primary and secondary generators.

Next, a twelfth embodiment of the present invention will be described. The connection diagram is the same as FIG. 5 showing the fourth embodiment. The difference from the fourth embodiment is that the input signals v1 and v2 in the generator field loss protection device 3 are (v1 -v
2) / (│v1│ + │v2│) is calculated and used for operation determination. In the same manner as in the fourth embodiment, in the generator in which the field loss occurs, the field voltage decreases, so that (v1 -v2) / (| v1 | + | v2 |)
Since the magnitude of the value indicated by becomes significantly larger than that in the normal state, when the value exceeds a certain set value, it is determined that the generator field is lost, and the protection device 3 is operated.

According to the present embodiment, the signal values obtained by detecting the field voltages of both the primary and secondary generators are represented by v1, v
2, the loss-of-field protection device 3 operates according to the value represented by (v 1 −v 2) / (| v 1 | + | v 2 |). The protection device can protect both the primary and secondary generators.

[0070]

As described above, according to the generator field loss protection device of the present invention, the field loss is detected even in the low frequency range, and furthermore, the protection of both the primary and secondary generators is performed by one protection device. It can be performed.

[Brief description of the drawings]

FIG. 1 is a connection diagram showing first, sixth, and seventh embodiments of a generator field loss protection device according to the present invention.

FIG. 2 is a vector diagram of an armature current flowing through a generator in the first embodiment.

FIG. 3 is a connection diagram showing a second embodiment of the generator field loss protection device according to the present invention.

FIG. 4 is a connection diagram showing third and ninth embodiments of the generator field loss protection device according to the present invention.

FIG. 5 is a connection diagram showing fourth, eleventh, and twelfth embodiments of the generator field loss protection device according to the present invention.

FIG. 6 is a connection diagram showing a fifth embodiment of the generator field loss protection device according to the present invention.

FIG. 7 is a characteristic diagram showing an operation of the generator field loss protection device according to the fifth embodiment.

FIG. 8 is a connection diagram showing a sixth embodiment of the generator field loss protection device according to the present invention.

FIG. 9 is a connection diagram showing an eighth embodiment of the generator field loss protection device according to the present invention.

FIG. 10 shows a tenth embodiment of the generator field loss protection device according to the present invention.
FIG. 2 is a connection diagram showing the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Primary generator, 2 ... Secondary generator, 3 ... Generator field loss protection device, 4 ... Current transformer (for primary generator), 5 ... Current transformer (for secondary generator), 6 ... Operation coil , 7: phase comparison circuit, 8: primary generator field winding, 9: secondary generator field winding, 10: shunt (for primary generator field current), 11: shunt (secondary generator field current) 12) Converter (for primary generator field voltage), 13 ... Converter (for secondary generator field voltage), 14 ... Transformer, 15 ... Generator overcurrent protection device.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Rikio Sato, 1st Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant (72) Inventor Fumio Sato 1-1-1, Shibaura, Minato-ku, Tokyo Toshiba Corporation In the head office (72) Inventor Yasuhiro Goto 1-1-1 Shibaura, Minato-ku, Tokyo F-term in the head office of Toshiba Corporation (reference) 5G044 AA02 AA03 AB05 AC01 BA09 5H590 AB02 AB10 CA04 CC01 EA14 FA06 FC25 HA03 HA04 HA05 HA09 HA10 HB02 HB03 JA16

Claims (12)

[Claims] 1. An electric power generation system characterized by detecting armature currents of a primary generator and a secondary generator provided in a cross-compound type power generation facility and operating based on a difference between the detected currents. Magnetic field loss protection device. 2. A generator field characterized by detecting armature currents of a primary generator and a secondary generator provided in a cross-compound type power generation facility and operating based on a phase difference between the detected currents. Magnetic loss protection device. 3. A power generator characterized in that it detects a field current between a primary generator and a secondary generator provided in a cross-compound type power generation facility and operates based on a difference between the detected currents. Magnetic field loss protection device. 4. A generator field sensor comprising detecting a field voltage between a primary generator and a secondary generator provided in a cross-compound type power generation facility, and operating based on a difference between the detected voltages. Loss protection device. 5. A generator field loss protection device characterized in that the set value is changed in accordance with the operating frequency of a primary generator and a secondary generator provided in a cross-compound type power generation facility. . 6. Detecting armature currents of a primary generator and a secondary generator provided in a cross-compound type power generation facility, and operates as a field loss protection device at low frequency operation due to a difference in the magnitude of the detected current. A generator field loss protection device configured to operate as an overcurrent protection device during the rated frequency operation by the sum of the magnitudes of the detected currents. 7. A power generation device comprising detecting an armature current of a primary generator and a secondary generator provided in a cross-compound type power generation facility, and operating based on a ratio of magnitudes of the detected currents. Magnetic field loss protection device. 8. When armature currents of a primary generator and a secondary generator provided in a cross-compound type power generation equipment are detected, and the detected currents are defined as i1 and i2 (i1
-I2) / (│i1│ + │i2│). 9. A power generator characterized by detecting field currents of a primary generator and a secondary generator provided in a cross-compound type power generation facility, and operating based on a ratio of magnitudes of the detected currents. Magnetic field loss protection device. 10. Detecting field currents of a primary generator and a secondary generator provided in a cross-compound type power generation facility, and setting the detected currents to if1, if2 (if1−if2) / (| if1 | + | If2 |), wherein the generator field loss protection device is configured to operate according to the value indicated by | if2 |). 11. A power generator characterized by detecting field voltages of a primary generator and a secondary generator provided in a cross-compound type power generation facility, and operating based on a ratio of magnitudes of the detected voltages. Magnetic field loss protection device. 12. When the field voltages of the primary generator and the secondary generator provided in the cross-compound type power generation equipment are detected and the detected voltages are set as v1 and v2 (v1
-V2) / (│v1│ + │v2│).