GG-22 overload relayDetailed product description：

The GG-22 overload relay is used to protect the AC generator from overload when disconnecting parallel running generators.

Overview of Structure 2
Overload relays are based on the principle of induction and operate with a rotating magnetic field.
The relay consists of an upper and lower magnetic circuit system in the magnetic conductor. The current coil is placed in the upper magnetic circuit system and is powered by a current transformer connected to a certain phase of the generator. Two series connected voltage coils are placed in the lower magnetic circuit system and connected between the phase voltages of the generator.
The rotating system of the relay has an aluminum disc fastened to the shaft (with steel shaft tips pressed into both ends of the shaft), and the rotating system is supported by steel balls located on the bearing screws through the shaft tips.
A gear is installed on the shaft of the aluminum disc, which meshes with the gear equipped with relay contacts: a balance spring that generates a reaction torque is fastened to the contact gear shaft.
The static contacts of the relay are fixed between the phosphor copper sheets on the rubberwood insulation base, and the screws installed on the contact base can adjust the position of the relay's static contacts. When the protected power grid experiences overload, torque is generated on the aluminum plate; Under the action of aluminum disc torque, the relay contacts close, the automatic switch on the current collection and discharge system operates, the relay current coil circuit is disconnected, and the balance spring of the rotating system returns to its original position.
Changing the number of turns of the relay current coil can alter the setting value of the relay's operating power, and the tap of the current coil is welded to the socket. The socket has three sockets, which correspond to 105%, 110%, and 115% of the rated power of the relay at rated voltage. When using a standard instrument current transformer, the relay operating power should be adjusted according to Table 1.
For the set value of known action power, simply insert it into the corresponding socket.
When converting loads, it is necessary to first screw the spare plug into the socket according to the required operating power, and then unscrew the first plug and insert it into the empty socket.
The relay has a delay device, which is related to power and is generated by the rotation of the aluminum disk of the rotating system between the permanent magnet poles. The permanent magnet is installed at the front of the relay.
Changing the stop position of the relay's moving contact can alter the setting value of the relay's action delay.
The stop lever is pointer type and can move along the dial. The division unit is seconds, and 0.25s, 0.5s, and 1s are engraved on the dial
1.5s，2s，2.5s。
When the contact is closed, the steel stopper located on the moving contact is close to the small permanent magnet fixed on the bottom plate of the contact system and is attracted, thereby ensuring the reliable closure of the contact system.
The magnetic conductor, rotating system, and contact system of the relay are installed on an aluminum silicon alloy frame, which is mounted on an aluminum silicon alloy base. The base is equipped with two terminal blocks, which are connected to the coil and contacts of the relay with wires. The base is also used to fasten the relay to the distribution panel.
The relay has a cover to protect the mechanism from mechanical damage and prevent water droplets from entering.
The internal wiring diagram during the relay period is shown in the GG-21 relay.

3 Technical data
3.1 Rated voltage: 127 and 230V, 50HZ.
3.2 Rated current: 5A.
3.3 When the relay is at its maximum sensitive angle, the operating current is 3.35A (at this time, the power factor of the generator grid is 1)
3.4 Maximum sensitivity angle: 30 ° -3 °.
3.5 Action power: 105%, 110%, and 115% of the rated action power.
3.6 The rated operating power is rated voltage × 3.35 × 1.
3.7 Action time at 1.2 times the action current: 0.25s, 0.2s, 1s, 1.5s, 2s, and 2.5s.
The rotational torque of the 3.8 relay is determined by the following equation:
M=K·Vp·Ip·COS(w+α)
Among them: K-proportionality coefficient VP - voltage applied to the relay
IP - current through relay w - vector VP and phase angle between IP
α - For this relay, it is 30 °
The setting of relay action power is carried out when the phase angle between rated voltage and current lead voltage is 30 °.
3.10 Delay setting is carried out when the phase angle of the lead voltage is 30 ° at 1.2 times the operating current of the rated voltage.
The ratio of the return power of the 3.11 relay to the operating power when the return coefficient returns to the initial position is not less than 0.6, and it is checked when the operating time is 0.25-1s.
The appearance and opening size diagram of the 3.12 relay are shown in the GG-21 relay.
3.13 Actual data of operating power of GG 22 relay when using standard measurement of current transformer

generator power PH(Kw)	Rated current of generator Ie=Pe/SQRT(3) Ve cosψ c	current mutual inductor transformation ratio	When the rated current of the generator is reached Transformer current I2（A）	Relays with different setting values Percentage of action power (%)			at IDZ=105％×le Action current of time	whether want calibration	pointer move direction
				When IDZ=105% × 3.35/0.8	When IDZ=110% × 3.35/0.8	When IDZ=115% × 3.35/0.8
twenty-five forty fifty seventy-five one hundred one hundred and fifty two hundred two hundred and twenty-five two hundred and fifty three hundred four hundred five hundred six hundred six hundred and fifty seven hundred and fifty one thousand	forty-five point two seventy-two point three ninety point four one hundred and thirty-five one hundred and eighty-one two hundred and seventy-one three hundred and sixty-two four hundred and seven four hundred and fifty-one five hundred and forty-two seven hundred and twenty-four nine hundred and three one thousand and eighty one thousand one hundred and seventy one thousand three hundred and fifty one thousand eight hundred and ten	ten fifteen twenty thirty forty sixty eighty one hundred and twenty one hundred and twenty one hundred and twenty one hundred and fifty two hundred three hundred three hundred three hundred four hundred	four point five two four point eight one four point five two four point five two four point five two four point five two four point five two three point three nine three point seven six four point five two four point eight one four point five two three point six two three point nine one four point five two four point five two	ninety-seven point five ninety-one point five ninety-seven point five ninety-seven point five ninety-seven point five ninety-seven point five ninety-seven point five one hundred and twenty-nine point five one hundred and seventeen ninety-seven point five ninety-one point five ninety-seven point five one hundred and twenty-one point five one hundred and twelve point five ninety-seven point five ninety-seven point five	one hundred and one point five ninety-five point five one hundred and one point five one hundred and one point five one hundred and one point five one hundred and one point five one hundred and one point five one point three six one hundred and twenty-two one hundred and one point five ninety-five point five one hundred and one point five one hundred and twenty-seven one hundred and seventeen point five one hundred and one point five one hundred and one point five	one hundred and seven one hundred one hundred and seven one hundred and seven one hundred and seven one hundred and seven one hundred and seven one hundred and forty-two one hundred and twenty-eight one hundred and seven one hundred one hundred and seven one hundred and thirty-three one hundred and twenty-three point five one hundred and seven one hundred and seven	three point eight four point zero five three point eight three point eight three point eight three point eight three point eight two point eight six three point one six three point eight four point zero five three point eight three point zero four three point two eight three point eight three point eight	*) *) *) *) *) *) *) *) *) *) *) *) *) *) *) *)	to the right to the right to the right to the right to the right to the right to the right to the left to the left to the right to the right to the left to the left to the left to the right to the right

The rated voltage of the generator Ue=400V, cos ψ c=0.8 * indicates the need to calibrate the scale.

4 Ordering Instructions
4.1 Product model and name.
4.2 Order quantity and specifications.

GG-22 overload relay（No image available）